--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.swt.gtk.linux.x86/src/org/eclipse/swt/widgets/Control.d	Fri Mar 20 23:03:58 2009 +0100
@@ -0,0 +1,4532 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2008 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module org.eclipse.swt.widgets.Control;
+
+import java.lang.all;
+
+
+import org.eclipse.swt.SWT;
+//import org.eclipse.swt.accessibility.Accessible;
+import org.eclipse.swt.events.ControlListener;
+import org.eclipse.swt.events.FocusListener;
+import org.eclipse.swt.events.HelpListener;
+import org.eclipse.swt.events.KeyListener;
+import org.eclipse.swt.events.MouseListener;
+import org.eclipse.swt.events.MouseMoveListener;
+import org.eclipse.swt.events.MouseTrackListener;
+import org.eclipse.swt.events.PaintListener;
+import org.eclipse.swt.events.TraverseListener;
+import org.eclipse.swt.events.DragDetectListener;
+import org.eclipse.swt.events.MenuDetectListener;
+import org.eclipse.swt.events.MouseWheelListener;
+import org.eclipse.swt.graphics.Color;
+import org.eclipse.swt.graphics.Cursor;
+import org.eclipse.swt.graphics.Device;
+import org.eclipse.swt.graphics.Drawable;
+import org.eclipse.swt.graphics.Font;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.graphics.GCData;
+import org.eclipse.swt.graphics.Image;
+import org.eclipse.swt.graphics.Point;
+import org.eclipse.swt.graphics.Rectangle;
+import org.eclipse.swt.graphics.Region;
+import org.eclipse.swt.internal.Converter;
+import org.eclipse.swt.internal.SWTEventListener;
+import org.eclipse.swt.internal.accessibility.gtk.ATK;
+import org.eclipse.swt.internal.gtk.OS;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Decorations;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.swt.widgets.Event;
+import org.eclipse.swt.widgets.Listener;
+import org.eclipse.swt.widgets.Menu;
+import org.eclipse.swt.widgets.Monitor;
+import org.eclipse.swt.widgets.Shell;
+import org.eclipse.swt.widgets.TypedListener;
+import org.eclipse.swt.widgets.Widget;
+import org.eclipse.swt.accessibility.Accessible;
+
+import tango.core.Thread;
+
+
+/**
+ * Control is the abstract superclass of all windowed user interface classes.
+ * <p>
+ * <dl>
+ * <dt><b>Styles:</b>
+ * <dd>BORDER</dd>
+ * <dd>LEFT_TO_RIGHT, RIGHT_TO_LEFT</dd>
+ * <dt><b>Events:</b>
+ * <dd>DragDetect, FocusIn, FocusOut, Help, KeyDown, KeyUp, MenuDetect, MouseDoubleClick, MouseDown, MouseEnter,
+ *     MouseExit, MouseHover, MouseUp, MouseMove, Move, Paint, Resize, Traverse</dd>
+ * </dl>
+ * </p><p>
+ * Only one of LEFT_TO_RIGHT or RIGHT_TO_LEFT may be specified.
+ * </p><p>
+ * IMPORTANT: This class is intended to be subclassed <em>only</em>
+ * within the SWT implementation.
+ * </p>
+ *
+ * @see <a href="http://www.eclipse.org/swt/snippets/#control">Control snippets</a>
+ * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample</a>
+ * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
+ */
+public abstract class Control : Widget, Drawable {
+
+    alias Widget.mnemonicHit mnemonicHit;
+    alias Widget.mnemonicMatch mnemonicMatch;
+    alias Widget.setForegroundColor setForegroundColor;
+    alias Widget.translateTraversal translateTraversal;
+    alias Widget.windowProc windowProc;
+
+    GtkWidget* fixedHandle;
+    GdkWindow* redrawWindow;
+    GdkWindow* enableWindow;
+    int drawCount;
+    Composite parent;
+    Cursor cursor;
+    Menu menu;
+    Image backgroundImage;
+    Font font;
+    Region region;
+    String toolTipText;
+    Object layoutData;
+    Accessible accessible;
+
+this () {
+}
+
+/**
+ * Constructs a new instance of this class given its parent
+ * and a style value describing its behavior and appearance.
+ * <p>
+ * The style value is either one of the style constants defined in
+ * class <code>SWT</code> which is applicable to instances of this
+ * class, or must be built by <em>bitwise OR</em>'ing together
+ * (that is, using the <code>int</code> "|" operator) two or more
+ * of those <code>SWT</code> style constants. The class description
+ * lists the style constants that are applicable to the class.
+ * Style bits are also inherited from superclasses.
+ * </p>
+ *
+ * @param parent a composite control which will be the parent of the new instance (cannot be null)
+ * @param style the style of control to construct
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
+ *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
+ * </ul>
+ *
+ * @see SWT#BORDER
+ * @see Widget#checkSubclass
+ * @see Widget#getStyle
+ */
+public this (Composite parent, int style) {
+    super (parent, style);
+    this.parent = parent;
+    createWidget (0);
+}
+
+Font defaultFont () {
+    return display.getSystemFont ();
+}
+
+override void deregister () {
+    super.deregister ();
+    if (fixedHandle !is null) display.removeWidget (fixedHandle);
+    auto imHandle = imHandle ();
+    if (imHandle !is null) display.removeWidget (cast(GtkWidget*)imHandle);
+}
+
+bool drawGripper (int x, int y, int width, int height, bool vertical) {
+    auto paintHandle = paintHandle ();
+    auto window = OS.GTK_WIDGET_WINDOW (paintHandle);
+    if (window is null) return false;
+    int orientation = vertical ? OS.GTK_ORIENTATION_HORIZONTAL : OS.GTK_ORIENTATION_VERTICAL;
+    if ((style & SWT.MIRRORED) !is 0) x = getClientWidth () - width - x;
+    char dummy;
+    OS.gtk_paint_handle (OS.gtk_widget_get_style (paintHandle), window, OS.GTK_STATE_NORMAL, OS.GTK_SHADOW_OUT, null, paintHandle, &dummy, x, y, width, height, orientation);
+    return true;
+}
+
+void enableWidget (bool enabled) {
+    OS.gtk_widget_set_sensitive (handle, enabled);
+}
+
+GtkWidget* enterExitHandle () {
+    return eventHandle ();
+}
+
+GtkWidget* eventHandle () {
+    return handle;
+}
+
+GdkWindow* eventWindow () {
+    auto eventHandle = eventHandle ();
+    OS.gtk_widget_realize (eventHandle);
+    return OS.GTK_WIDGET_WINDOW (eventHandle);
+}
+
+void fixFocus (Control focusControl) {
+    Shell shell = getShell ();
+    Control control = this;
+    while (control !is shell && (control = control.parent) !is null) {
+        if (control.setFocus ()) return;
+    }
+    shell.setSavedFocus (focusControl);
+    auto focusHandle_ = shell.vboxHandle;
+    OS.GTK_WIDGET_SET_FLAGS (focusHandle_, OS.GTK_CAN_FOCUS);
+    OS.gtk_widget_grab_focus (focusHandle_);
+    OS.GTK_WIDGET_UNSET_FLAGS (focusHandle_, OS.GTK_CAN_FOCUS);
+}
+
+public void fixStyle () {
+    if (fixedHandle !is null) fixStyle (fixedHandle);
+}
+
+void fixStyle (GtkWidget* handle) {
+    /*
+    * Feature in GTK.  Some GTK themes apply a different background to
+    * the contents of a GtkNotebook.  However, in an SWT TabFolder, the
+    * children are not parented below the GtkNotebook widget, and usually
+    * have their own GtkFixed.  The fix is to look up the correct style
+    * for a child of a GtkNotebook and apply its background to any GtkFixed
+    * widgets that are direct children of an SWT TabFolder.
+    *
+    * Note that this has to be when the theme settings changes and that it
+    * should not override the application background.
+    */
+    if ((state & BACKGROUND) !is 0) return;
+    auto childStyle = parent.childStyle ();
+    if (childStyle !is null) {
+        GdkColor color;
+        OS.gtk_style_get_bg (childStyle, 0, &color);
+        OS.gtk_widget_modify_bg (handle, 0, &color);
+    }
+}
+
+GtkWidget* focusHandle () {
+    return handle;
+}
+
+GtkWidget* fontHandle () {
+    return handle;
+}
+
+bool hasFocus () {
+    return this is display.getFocusControl();
+}
+
+override void hookEvents () {
+    /* Connect the keyboard signals */
+    auto focusHandle_ = focusHandle ();
+    int focusMask = OS.GDK_KEY_PRESS_MASK | OS.GDK_KEY_RELEASE_MASK | OS.GDK_FOCUS_CHANGE_MASK;
+    OS.gtk_widget_add_events (focusHandle_, focusMask);
+    OS.g_signal_connect_closure_by_id (focusHandle_, display.signalIds [POPUP_MENU], 0, display.closures [POPUP_MENU], false);
+    OS.g_signal_connect_closure_by_id (focusHandle_, display.signalIds [SHOW_HELP], 0, display.closures [SHOW_HELP], false);
+    OS.g_signal_connect_closure_by_id (focusHandle_, display.signalIds [KEY_PRESS_EVENT], 0, display.closures [KEY_PRESS_EVENT], false);
+    OS.g_signal_connect_closure_by_id (focusHandle_, display.signalIds [KEY_RELEASE_EVENT], 0, display.closures [KEY_RELEASE_EVENT], false);
+    OS.g_signal_connect_closure_by_id (focusHandle_, display.signalIds [FOCUS], 0, display.closures [FOCUS], false);
+    OS.g_signal_connect_closure_by_id (focusHandle_, display.signalIds [FOCUS_IN_EVENT], 0, display.closures [FOCUS_IN_EVENT], false);
+    OS.g_signal_connect_closure_by_id (focusHandle_, display.signalIds [FOCUS_OUT_EVENT], 0, display.closures [FOCUS_OUT_EVENT], false);
+
+    /* Connect the mouse signals */
+    auto eventHandle = eventHandle ();
+    int eventMask = OS.GDK_POINTER_MOTION_MASK | OS.GDK_BUTTON_PRESS_MASK | OS.GDK_BUTTON_RELEASE_MASK;
+    OS.gtk_widget_add_events (eventHandle, eventMask);
+    OS.g_signal_connect_closure_by_id (eventHandle, display.signalIds [BUTTON_PRESS_EVENT], 0, display.closures [BUTTON_PRESS_EVENT], false);
+    OS.g_signal_connect_closure_by_id (eventHandle, display.signalIds [BUTTON_RELEASE_EVENT], 0, display.closures [BUTTON_RELEASE_EVENT], false);
+    OS.g_signal_connect_closure_by_id (eventHandle, display.signalIds [MOTION_NOTIFY_EVENT], 0, display.closures [MOTION_NOTIFY_EVENT], false);
+    OS.g_signal_connect_closure_by_id (eventHandle, display.signalIds [SCROLL_EVENT], 0, display.closures [SCROLL_EVENT], false);
+
+    /* Connect enter/exit signals */
+    auto enterExitHandle = enterExitHandle ();
+    int enterExitMask = OS.GDK_ENTER_NOTIFY_MASK | OS.GDK_LEAVE_NOTIFY_MASK;
+    OS.gtk_widget_add_events (enterExitHandle, enterExitMask);
+    OS.g_signal_connect_closure_by_id (enterExitHandle, display.signalIds [ENTER_NOTIFY_EVENT], 0, display.closures [ENTER_NOTIFY_EVENT], false);
+    OS.g_signal_connect_closure_by_id (enterExitHandle, display.signalIds [LEAVE_NOTIFY_EVENT], 0, display.closures [LEAVE_NOTIFY_EVENT], false);
+
+    /*
+    * Feature in GTK.  Events such as mouse move are propagate up
+    * the widget hierarchy and are seen by the parent.  This is the
+    * correct GTK behavior but not correct for SWT.  The fix is to
+    * hook a signal after and stop the propagation using a negative
+    * event number to distinguish this case.
+    *
+    * The signal is hooked to the fixedHandle to catch events sent to
+    * lightweight widgets.
+    */
+    auto blockHandle = fixedHandle !is null ? fixedHandle : eventHandle;
+    OS.g_signal_connect_closure_by_id (blockHandle, display.signalIds [BUTTON_PRESS_EVENT], 0, display.closures [BUTTON_PRESS_EVENT_INVERSE], true);
+    OS.g_signal_connect_closure_by_id (blockHandle, display.signalIds [BUTTON_RELEASE_EVENT], 0, display.closures [BUTTON_RELEASE_EVENT_INVERSE], true);
+    OS.g_signal_connect_closure_by_id (blockHandle, display.signalIds [MOTION_NOTIFY_EVENT], 0, display.closures [MOTION_NOTIFY_EVENT_INVERSE], true);
+
+    /* Connect the event_after signal for both key and mouse */
+    OS.g_signal_connect_closure_by_id (eventHandle, display.signalIds [EVENT_AFTER], 0, display.closures [EVENT_AFTER], false);
+    if (focusHandle_ !is eventHandle) {
+        OS.g_signal_connect_closure_by_id (focusHandle_, display.signalIds [EVENT_AFTER], 0, display.closures [EVENT_AFTER], false);
+    }
+
+    /* Connect the paint signal */
+    auto paintHandle = paintHandle ();
+    int paintMask = OS.GDK_EXPOSURE_MASK | OS.GDK_VISIBILITY_NOTIFY_MASK;
+    OS.gtk_widget_add_events (paintHandle, paintMask);
+    OS.g_signal_connect_closure_by_id (paintHandle, display.signalIds [EXPOSE_EVENT], 0, display.closures [EXPOSE_EVENT_INVERSE], false);
+    OS.g_signal_connect_closure_by_id (paintHandle, display.signalIds [VISIBILITY_NOTIFY_EVENT], 0, display.closures [VISIBILITY_NOTIFY_EVENT], false);
+    OS.g_signal_connect_closure_by_id (paintHandle, display.signalIds [EXPOSE_EVENT], 0, display.closures [EXPOSE_EVENT], true);
+
+    /* Connect the Input Method signals */
+    OS.g_signal_connect_closure_by_id (handle, display.signalIds [REALIZE], 0, display.closures [REALIZE], true);
+    OS.g_signal_connect_closure_by_id (handle, display.signalIds [UNREALIZE], 0, display.closures [UNREALIZE], false);
+    auto imHandle = imHandle ();
+    if (imHandle !is null) {
+        OS.g_signal_connect_closure (imHandle, OS.commit.ptr, display.closures [COMMIT], false);
+        OS.g_signal_connect_closure (imHandle, OS.preedit_changed.ptr, display.closures [PREEDIT_CHANGED], false);
+    }
+
+    OS.g_signal_connect_closure_by_id (paintHandle, display.signalIds [STYLE_SET], 0, display.closures [STYLE_SET], false);
+
+    auto topHandle_ = topHandle ();
+    OS.g_signal_connect_closure_by_id (topHandle_, display.signalIds [MAP], 0, display.closures [MAP], true);
+}
+
+override int /*long*/ hoverProc (GtkWidget* widget) {
+    int x, y;
+    int mask;
+    OS.gdk_window_get_pointer (null, &x, &y, &mask);
+    sendMouseEvent (SWT.MouseHover, 0, /*time*/0, x , y , false, mask );
+    /* Always return zero in order to cancel the hover timer */
+    return 0;
+}
+
+override GtkWidget* topHandle() {
+    if (fixedHandle !is null) return fixedHandle;
+    return super.topHandle ();
+}
+
+GtkWidget* paintHandle () {
+    auto topHandle_ = topHandle ();
+    auto paintHandle = handle;
+    while (paintHandle !is topHandle_) {
+        if ((OS.GTK_WIDGET_FLAGS (paintHandle) & OS.GTK_NO_WINDOW) is 0) break;
+        paintHandle = OS.gtk_widget_get_parent (paintHandle);
+    }
+    return paintHandle;
+}
+
+override GdkWindow* paintWindow () {
+    auto paintHandle = paintHandle ();
+    OS.gtk_widget_realize (paintHandle);
+    return OS.GTK_WIDGET_WINDOW (paintHandle);
+}
+
+/**
+ * Prints the receiver and all children.
+ *
+ * @param gc the gc where the drawing occurs
+ * @return <code>true</code> if the operation was successful and <code>false</code> otherwise
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the gc is null</li>
+ *    <li>ERROR_INVALID_ARGUMENT - if the gc has been disposed</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @since 3.4
+ */
+public bool print (GC gc) {
+    checkWidget ();
+    if (gc is null) error (SWT.ERROR_NULL_ARGUMENT);
+    if (gc.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT);
+    auto topHandle_ = topHandle ();
+    OS.gtk_widget_realize (topHandle_);
+    auto window = OS.GTK_WIDGET_WINDOW (topHandle_);
+    GCData data = gc.getGCData ();
+    OS.gdk_window_process_updates (window, cast(int)true);
+    printWidget (gc, data.drawable, OS.gdk_drawable_get_depth (data.drawable), 0, 0);
+    return true;
+}
+
+void printWidget (GC gc, GdkDrawable* drawable, int depth, int x, int y) {
+    bool obscured = (state & OBSCURED) !is 0;
+    state &= ~OBSCURED;
+    auto topHandle_ = topHandle ();
+    auto window = OS.GTK_WIDGET_WINDOW (topHandle_);
+    printWindow (true, this, gc.handle, drawable, depth, window, x, y);
+    if (obscured) state |= OBSCURED;
+}
+
+void printWindow (bool first, Control control, GdkGC* gc, GdkDrawable* drawable, int depth, GdkDrawable* window, int x, int y) {
+    if (OS.gdk_drawable_get_depth (window) !is depth) return;
+    GdkRectangle rect;
+    int width, height;
+    OS.gdk_drawable_get_size (window, &width, &height);
+    rect.width = width;
+    rect.height = height;
+    OS.gdk_window_begin_paint_rect (window, &rect);
+    GdkDrawable* real_drawable;
+    int x_offset, y_offset;
+    OS.gdk_window_get_internal_paint_info (window, &real_drawable, &x_offset, &y_offset);
+    void* userData;
+    OS.gdk_window_get_user_data (window, &userData);
+    if (userData !is null) {
+        GdkEventExpose* event = cast(GdkEventExpose*) OS.gdk_event_new (OS.GDK_EXPOSE);
+        event.type = OS.GDK_EXPOSE;
+        event.window = cast(GdkDrawable*)OS.g_object_ref (window);
+        event.area.width = rect.width;
+        event.area.height = rect.height;
+        event.region = OS.gdk_region_rectangle (&rect);
+        OS.gtk_widget_send_expose (userData, cast(GdkEvent*)event);
+        OS.gdk_event_free (cast(GdkEvent*)event);
+    }
+    int srcX = x_offset, srcY = y_offset;
+    int destX = x, destY = y, destWidth = width, destHeight = height;
+    if (!first) {
+        int cX, cY;
+        OS.gdk_window_get_position (window, &cX, &cY);
+        auto parentWindow = OS.gdk_window_get_parent (window);
+        int pW, pH;
+        OS.gdk_drawable_get_size (parentWindow, &pW, &pH);
+        srcX = x_offset - cX;
+        srcY = y_offset - cY;
+        destX = x - cX;
+        destY = y - cY;
+        destWidth = Math.min (cX + width, pW);
+        destHeight = Math.min (cY + height, pH);
+    }
+    OS.gdk_draw_drawable (drawable, gc, real_drawable, srcX, srcY, destX, destY, destWidth, destHeight);
+    OS.gdk_window_end_paint (window);
+    auto children = OS.gdk_window_get_children (window);
+    if (children !is null) {
+        auto windows = children;
+        while (windows !is null) {
+            auto child = cast(GdkDrawable*) OS.g_list_data (windows);
+            if (OS.gdk_window_is_visible (child)) {
+                void* data;
+                OS.gdk_window_get_user_data (child, &data);
+                if (data !is null) {
+                    Widget widget = display.findWidget ( cast(GtkWidget*) data);
+                    if (widget is null || widget is control) {
+                        int x_pos, y_pos;
+                        OS.gdk_window_get_position (child, &x_pos, &y_pos);
+                        printWindow (false, control, gc, drawable, depth, child, x + x_pos, y + y_pos);
+                    }
+                }
+            }
+            windows = OS.g_list_next (windows);
+        }
+        OS.g_list_free (children);
+    }
+}
+
+/**
+ * Returns the preferred size of the receiver.
+ * <p>
+ * The <em>preferred size</em> of a control is the size that it would
+ * best be displayed at. The width hint and height hint arguments
+ * allow the caller to ask a control questions such as "Given a particular
+ * width, how high does the control need to be to show all of the contents?"
+ * To indicate that the caller does not wish to constrain a particular
+ * dimension, the constant <code>SWT.DEFAULT</code> is passed for the hint.
+ * </p>
+ *
+ * @param wHint the width hint (can be <code>SWT.DEFAULT</code>)
+ * @param hHint the height hint (can be <code>SWT.DEFAULT</code>)
+ * @return the preferred size of the control
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see Layout
+ * @see #getBorderWidth
+ * @see #getBounds
+ * @see #getSize
+ * @see #pack(bool)
+ * @see "computeTrim, getClientArea for controls that implement them"
+ */
+public Point computeSize (int wHint, int hHint) {
+    return computeSize (wHint, hHint, true);
+}
+
+Control computeTabGroup () {
+    if (isTabGroup()) return this;
+    return parent.computeTabGroup ();
+}
+
+Control[] computeTabList() {
+    if (isTabGroup()) {
+        if (getVisible() && getEnabled()) {
+            return [this];
+        }
+    }
+    return new Control[0];
+}
+
+Control computeTabRoot () {
+    Control[] tabList = parent._getTabList();
+    if (tabList !is null) {
+        int index = 0;
+        while (index < tabList.length) {
+            if (tabList [index] is this) break;
+            index++;
+        }
+        if (index is tabList.length) {
+            if (isTabGroup ()) return this;
+        }
+    }
+    return parent.computeTabRoot ();
+}
+
+void checkBuffered () {
+    style |= SWT.DOUBLE_BUFFERED;
+}
+
+void checkBackground () {
+    Shell shell = getShell ();
+    if (this is shell) return;
+    state &= ~PARENT_BACKGROUND;
+    Composite composite = parent;
+    do {
+        int mode = composite.backgroundMode;
+        if (mode !is SWT.INHERIT_NONE) {
+            if (mode is SWT.INHERIT_DEFAULT) {
+                Control control = this;
+                do {
+                    if ((control.state & THEME_BACKGROUND) is 0) {
+                        return;
+                    }
+                    control = control.parent;
+                } while (control !is composite);
+            }
+            state |= PARENT_BACKGROUND;
+            return;
+        }
+        if (composite is shell) break;
+        composite = composite.parent;
+    } while (true);
+}
+
+void checkBorder () {
+    if (getBorderWidth () is 0) style &= ~SWT.BORDER;
+}
+
+void checkMirrored () {
+    if ((style & SWT.RIGHT_TO_LEFT) !is 0) style |= SWT.MIRRORED;
+}
+
+GtkStyle* childStyle () {
+    return parent.childStyle ();
+}
+
+override void createWidget (int index) {
+    state |= DRAG_DETECT;
+    checkOrientation (parent);
+    super.createWidget (index);
+    checkBackground ();
+    if ((state & PARENT_BACKGROUND) !is 0) setBackground ();
+    checkBuffered ();
+    showWidget ();
+    setInitialBounds ();
+    setZOrder (null, false, false);
+    setRelations ();
+    checkMirrored ();
+    checkBorder ();
+}
+
+/**
+ * Returns the preferred size of the receiver.
+ * <p>
+ * The <em>preferred size</em> of a control is the size that it would
+ * best be displayed at. The width hint and height hint arguments
+ * allow the caller to ask a control questions such as "Given a particular
+ * width, how high does the control need to be to show all of the contents?"
+ * To indicate that the caller does not wish to constrain a particular
+ * dimension, the constant <code>SWT.DEFAULT</code> is passed for the hint.
+ * </p><p>
+ * If the changed flag is <code>true</code>, it indicates that the receiver's
+ * <em>contents</em> have changed, therefore any caches that a layout manager
+ * containing the control may have been keeping need to be flushed. When the
+ * control is resized, the changed flag will be <code>false</code>, so layout
+ * manager caches can be retained.
+ * </p>
+ *
+ * @param wHint the width hint (can be <code>SWT.DEFAULT</code>)
+ * @param hHint the height hint (can be <code>SWT.DEFAULT</code>)
+ * @param changed <code>true</code> if the control's contents have changed, and <code>false</code> otherwise
+ * @return the preferred size of the control.
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see Layout
+ * @see #getBorderWidth
+ * @see #getBounds
+ * @see #getSize
+ * @see #pack(bool)
+ * @see "computeTrim, getClientArea for controls that implement them"
+ */
+public Point computeSize (int wHint, int hHint, bool changed) {
+    checkWidget();
+    if (wHint !is SWT.DEFAULT && wHint < 0) wHint = 0;
+    if (hHint !is SWT.DEFAULT && hHint < 0) hHint = 0;
+    return computeNativeSize (handle, wHint, hHint, changed);
+}
+
+Point computeNativeSize (GtkWidget* h, int wHint, int hHint, bool changed) {
+    int width = wHint, height = hHint;
+    if (wHint is SWT.DEFAULT && hHint is SWT.DEFAULT) {
+        GtkRequisition requisition;
+        gtk_widget_size_request (h, &requisition);
+        width = OS.GTK_WIDGET_REQUISITION_WIDTH (h);
+        height = OS.GTK_WIDGET_REQUISITION_HEIGHT (h);
+    } else if (wHint is SWT.DEFAULT || hHint is SWT.DEFAULT) {
+        int reqWidth, reqHeight;
+        OS.gtk_widget_get_size_request (h, &reqWidth, &reqHeight);
+        OS.gtk_widget_set_size_request (h, wHint, hHint);
+        GtkRequisition requisition;
+        gtk_widget_size_request (h, &requisition);
+        OS.gtk_widget_set_size_request (h, reqWidth, reqHeight);
+        width = wHint is SWT.DEFAULT ? requisition.width : wHint;
+        height = hHint is SWT.DEFAULT ? requisition.height : hHint;
+    }
+    return new Point (width, height);
+}
+
+void forceResize () {
+    /*
+    * Force size allocation on all children of this widget's
+    * topHandle.  Note that all calls to gtk_widget_size_allocate()
+    * must be preceded by a call to gtk_widget_size_request().
+    */
+    auto topHandle_ = topHandle ();
+    GtkRequisition requisition;
+    gtk_widget_size_request (topHandle_, &requisition);
+    GtkAllocation allocation;
+    allocation.x = OS.GTK_WIDGET_X (topHandle_);
+    allocation.y = OS.GTK_WIDGET_Y (topHandle_);
+    allocation.width = OS.GTK_WIDGET_WIDTH (topHandle_);
+    allocation.height = OS.GTK_WIDGET_HEIGHT (topHandle_);
+    OS.gtk_widget_size_allocate (topHandle_, &allocation);
+}
+
+/**
+ * Returns the accessible object for the receiver.
+ * If this is the first time this object is requested,
+ * then the object is created and returned.
+ *
+ * @return the accessible object
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see Accessible#addAccessibleListener
+ * @see Accessible#addAccessibleControlListener
+ *
+ * @since 2.0
+ */
+public Accessible getAccessible () {
+    checkWidget ();
+    if (accessible is null) {
+        accessible = Accessible.internal_new_Accessible (this);
+    }
+    return accessible;
+}
+
+/**
+ * Returns a rectangle describing the receiver's size and location
+ * relative to its parent (or its display if its parent is null),
+ * unless the receiver is a shell. In this case, the location is
+ * relative to the display.
+ *
+ * @return the receiver's bounding rectangle
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public Rectangle getBounds () {
+    checkWidget();
+    auto topHandle_ = topHandle ();
+    int x = OS.GTK_WIDGET_X (topHandle_);
+    int y = OS.GTK_WIDGET_Y (topHandle_);
+    int width = (state & ZERO_WIDTH) !is 0 ? 0 : OS.GTK_WIDGET_WIDTH (topHandle_);
+    int height = (state & ZERO_HEIGHT) !is 0 ? 0 : OS.GTK_WIDGET_HEIGHT (topHandle_);
+    if ((parent.style & SWT.MIRRORED) !is 0) x = parent.getClientWidth () - width - x;
+    return new Rectangle (x, y, width, height);
+}
+
+/**
+ * Sets the receiver's size and location to the rectangular
+ * area specified by the argument. The <code>x</code> and
+ * <code>y</code> fields of the rectangle are relative to
+ * the receiver's parent (or its display if its parent is null).
+ * <p>
+ * Note: Attempting to set the width or height of the
+ * receiver to a negative number will cause that
+ * value to be set to zero instead.
+ * </p>
+ *
+ * @param rect the new bounds for the receiver
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setBounds (Rectangle rect) {
+    checkWidget ();
+    if (rect is null) error (SWT.ERROR_NULL_ARGUMENT);
+    setBounds (rect.x, rect.y, Math.max (0, rect.width), Math.max (0, rect.height), true, true);
+}
+
+/**
+ * Sets the receiver's size and location to the rectangular
+ * area specified by the arguments. The <code>x</code> and
+ * <code>y</code> arguments are relative to the receiver's
+ * parent (or its display if its parent is null), unless
+ * the receiver is a shell. In this case, the <code>x</code>
+ * and <code>y</code> arguments are relative to the display.
+ * <p>
+ * Note: Attempting to set the width or height of the
+ * receiver to a negative number will cause that
+ * value to be set to zero instead.
+ * </p>
+ *
+ * @param x the new x coordinate for the receiver
+ * @param y the new y coordinate for the receiver
+ * @param width the new width for the receiver
+ * @param height the new height for the receiver
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setBounds (int x, int y, int width, int height) {
+    checkWidget();
+    setBounds (x, y, Math.max (0, width), Math.max (0, height), true, true);
+}
+
+void markLayout (bool changed, bool all) {
+    /* Do nothing */
+}
+
+override void modifyStyle (GtkWidget* handle, GtkRcStyle* style) {
+    super.modifyStyle(handle, style);
+    /*
+    * Bug in GTK.  When changing the style of a control that
+    * has had a region set on it, the region is lost.  The
+    * fix is to set the region again.
+    */
+    if (region !is null) OS.gdk_window_shape_combine_region (OS.GTK_WIDGET_WINDOW (topHandle ()), region.handle, 0, 0);
+}
+
+void moveHandle (int x, int y) {
+    auto topHandle_ = topHandle ();
+    auto parentHandle = parent.parentingHandle ();
+    /*
+    * Feature in GTK.  Calling gtk_fixed_move() to move a child causes
+    * the whole parent to redraw.  This is a performance problem. The
+    * fix is temporarily make the parent not visible during the move.
+    *
+    * NOTE: Because every widget in SWT has an X window, the new and
+    * old bounds of the child are correctly redrawn.
+    */
+    int flags = OS.GTK_WIDGET_FLAGS (parentHandle);
+    OS.GTK_WIDGET_UNSET_FLAGS (parentHandle, OS.GTK_VISIBLE);
+    OS.gtk_fixed_move (cast(GtkFixed*)parentHandle, topHandle_, x, y);
+    if ((flags & OS.GTK_VISIBLE) !is 0) {
+        OS.GTK_WIDGET_SET_FLAGS (parentHandle, OS.GTK_VISIBLE);
+    }
+}
+
+void resizeHandle (int width, int height) {
+    auto topHandle_ = topHandle ();
+    OS.gtk_widget_set_size_request (topHandle_, width, height);
+    if (topHandle_ !is handle) OS.gtk_widget_set_size_request (handle, width, height);
+}
+
+int setBounds (int x, int y, int width, int height, bool move, bool resize) {
+    auto topHandle_ = topHandle ();
+    bool sendMove = move;
+    if ((parent.style & SWT.MIRRORED) !is 0) {
+        int clientWidth = parent.getClientWidth ();
+        int oldWidth = (state & ZERO_WIDTH) !is 0 ? 0 : OS.GTK_WIDGET_WIDTH (topHandle_);
+        int oldX = clientWidth - oldWidth - OS.GTK_WIDGET_X (topHandle_);
+        if (move) {
+            sendMove &= x !is oldX;
+            x = clientWidth - (resize ? width : oldWidth) - x;
+        } else {
+            move = true;
+            x = clientWidth - (resize ? width : oldWidth) - oldX;
+            y = OS.GTK_WIDGET_Y (topHandle_);
+        }
+    }
+    bool sameOrigin = true, sameExtent = true;
+    if (move) {
+        int oldX = OS.GTK_WIDGET_X (topHandle_);
+        int oldY = OS.GTK_WIDGET_Y (topHandle_);
+        sameOrigin = x is oldX && y is oldY;
+        if (!sameOrigin) {
+            if (enableWindow !is null) {
+                OS.gdk_window_move (enableWindow, x, y);
+            }
+            moveHandle (x, y);
+        }
+    }
+    int clientWidth = 0;
+    if (resize) {
+        int oldWidth = (state & ZERO_WIDTH) !is 0 ? 0 : OS.GTK_WIDGET_WIDTH (topHandle_);
+        int oldHeight = (state & ZERO_HEIGHT) !is 0 ? 0 : OS.GTK_WIDGET_HEIGHT (topHandle_);
+        sameExtent = width is oldWidth && height is oldHeight;
+        if (!sameExtent && (style & SWT.MIRRORED) !is 0) clientWidth = getClientWidth ();
+        if (!sameExtent && !(width is 0 && height is 0)) {
+            int newWidth = Math.max (1, width);
+            int newHeight = Math.max (1, height);
+            if (redrawWindow !is null) {
+                OS.gdk_window_resize (redrawWindow, newWidth, newHeight);
+            }
+            if (enableWindow !is null) {
+                OS.gdk_window_resize (enableWindow, newWidth, newHeight);
+            }
+            resizeHandle (newWidth, newHeight);
+        }
+    }
+    if (!sameOrigin || !sameExtent) {
+        /*
+        * Cause a size allocation this widget's topHandle.  Note that
+        * all calls to gtk_widget_size_allocate() must be preceded by
+        * a call to gtk_widget_size_request().
+        */
+        GtkRequisition requisition;
+        gtk_widget_size_request (topHandle_, &requisition);
+        GtkAllocation allocation;
+        if (move) {
+            allocation.x = x;
+            allocation.y = y;
+        } else {
+            allocation.x = OS.GTK_WIDGET_X (topHandle_);
+            allocation.y = OS.GTK_WIDGET_Y (topHandle_);
+        }
+        if (resize) {
+            allocation.width = width;
+            allocation.height = height;
+        } else {
+            allocation.width = OS.GTK_WIDGET_WIDTH (topHandle_);
+            allocation.height = OS.GTK_WIDGET_HEIGHT (topHandle_);
+        }
+        OS.gtk_widget_size_allocate (topHandle_, &allocation);
+    }
+    /*
+    * Bug in GTK.  Widgets cannot be sized smaller than 1x1.
+    * The fix is to hide zero-sized widgets and show them again
+    * when they are resized larger.
+    */
+    if (!sameExtent) {
+        state = (width is 0) ? state | ZERO_WIDTH : state & ~ZERO_WIDTH;
+        state = (height is 0) ? state | ZERO_HEIGHT : state & ~ZERO_HEIGHT;
+        if ((state & (ZERO_WIDTH | ZERO_HEIGHT)) !is 0) {
+            if (enableWindow !is null) {
+                OS.gdk_window_hide (enableWindow);
+            }
+            OS.gtk_widget_hide (topHandle_);
+        } else {
+            if ((state & HIDDEN) is 0) {
+                if (enableWindow !is null) {
+                    OS.gdk_window_show_unraised (enableWindow);
+                }
+                OS.gtk_widget_show (topHandle_);
+            }
+        }
+        if ((style & SWT.MIRRORED) !is 0) moveChildren (clientWidth);
+    }
+    int result = 0;
+    if (move && !sameOrigin) {
+        Control control = findBackgroundControl ();
+        if (control !is null && control.backgroundImage !is null) {
+            if (isVisible ()) redrawWidget (0, 0, 0, 0, true, true, true);
+        }
+        if (sendMove) sendEvent (SWT.Move);
+        result |= MOVED;
+    }
+    if (resize && !sameExtent) {
+        sendEvent (SWT.Resize);
+        result |= RESIZED;
+    }
+    return result;
+}
+
+/**
+ * Returns a point describing the receiver's location relative
+ * to its parent (or its display if its parent is null), unless
+ * the receiver is a shell. In this case, the point is
+ * relative to the display.
+ *
+ * @return the receiver's location
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public Point getLocation () {
+    checkWidget();
+    auto topHandle_ = topHandle ();
+    int x = OS.GTK_WIDGET_X (topHandle_);
+    int y = OS.GTK_WIDGET_Y (topHandle_);
+    if ((parent.style & SWT.MIRRORED) !is 0) {
+        int width = (state & ZERO_WIDTH) !is 0 ? 0 : OS.GTK_WIDGET_WIDTH (topHandle_);
+        x = parent.getClientWidth () - width - x;
+    }
+    return new Point (x, y);
+}
+
+/**
+ * Sets the receiver's location to the point specified by
+ * the arguments which are relative to the receiver's
+ * parent (or its display if its parent is null), unless
+ * the receiver is a shell. In this case, the point is
+ * relative to the display.
+ *
+ * @param location the new location for the receiver
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setLocation (Point location) {
+    checkWidget ();
+    if (location is null) error (SWT.ERROR_NULL_ARGUMENT);
+    setBounds (location.x, location.y, 0, 0, true, false);
+}
+
+/**
+ * Sets the receiver's location to the point specified by
+ * the arguments which are relative to the receiver's
+ * parent (or its display if its parent is null), unless
+ * the receiver is a shell. In this case, the point is
+ * relative to the display.
+ *
+ * @param x the new x coordinate for the receiver
+ * @param y the new y coordinate for the receiver
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setLocation(int x, int y) {
+    checkWidget();
+    setBounds (x, y, 0, 0, true, false);
+}
+
+/**
+ * Returns a point describing the receiver's size. The
+ * x coordinate of the result is the width of the receiver.
+ * The y coordinate of the result is the height of the
+ * receiver.
+ *
+ * @return the receiver's size
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public Point getSize () {
+    checkWidget();
+    auto topHandle_ = topHandle ();
+    int width = (state & ZERO_WIDTH) !is 0 ? 0 : OS.GTK_WIDGET_WIDTH (topHandle_);
+    int height = (state & ZERO_HEIGHT) !is 0 ? 0 : OS.GTK_WIDGET_HEIGHT (topHandle_);
+    return new Point (width, height);
+}
+
+/**
+ * Sets the receiver's size to the point specified by the argument.
+ * <p>
+ * Note: Attempting to set the width or height of the
+ * receiver to a negative number will cause them to be
+ * set to zero instead.
+ * </p>
+ *
+ * @param size the new size for the receiver
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the point is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setSize (Point size) {
+    checkWidget ();
+    if (size is null) error (SWT.ERROR_NULL_ARGUMENT);
+    setBounds (0, 0, Math.max (0, size.x), Math.max (0, size.y), false, true);
+}
+
+/**
+ * Sets the shape of the control to the region specified
+ * by the argument.  When the argument is null, the
+ * default shape of the control is restored.
+ *
+ * @param region the region that defines the shape of the control (or null)
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_ARGUMENT - if the region has been disposed</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @since 3.4
+ */
+public void setRegion (Region region) {
+    checkWidget ();
+    if (region !is null && region.isDisposed()) error (SWT.ERROR_INVALID_ARGUMENT);
+    auto window = OS.GTK_WIDGET_WINDOW (topHandle ());
+    auto shape_region = (region is null) ? null : region.handle;
+    OS.gdk_window_shape_combine_region (window, shape_region, 0, 0);
+    this.region = region;
+}
+
+void setRelations () {
+    auto parentHandle = parent.parentingHandle ();
+    auto list = OS.gtk_container_get_children (cast(GtkContainer*)parentHandle);
+    if (list is null) return;
+    int count = OS.g_list_length (list);
+    if (count > 1) {
+        /*
+         * the receiver is the last item in the list, so its predecessor will
+         * be the second-last item in the list
+         */
+        auto handle = cast(GtkWidget*) OS.g_list_nth_data (list, count - 2);
+        if (handle !is null) {
+            Widget widget = display.getWidget (handle);
+            if (widget !is null && widget !is this) {
+                if (auto sibling = cast(Control)widget ) {
+                    sibling.addRelation (this);
+                }
+            }
+        }
+    }
+    OS.g_list_free (list);
+}
+
+/**
+ * Sets the receiver's size to the point specified by the arguments.
+ * <p>
+ * Note: Attempting to set the width or height of the
+ * receiver to a negative number will cause that
+ * value to be set to zero instead.
+ * </p>
+ *
+ * @param width the new width for the receiver
+ * @param height the new height for the receiver
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setSize (int width, int height) {
+    checkWidget();
+    setBounds (0, 0, Math.max (0, width), Math.max (0, height), false, true);
+}
+
+/*
+ * Answers a bool indicating whether a Label that precedes the receiver in
+ * a layout should be read by screen readers as the recevier's label.
+ */
+bool isDescribedByLabel () {
+    return true;
+}
+
+bool isFocusHandle (GtkWidget* widget) {
+    return widget is focusHandle ();
+}
+
+/**
+ * Moves the receiver above the specified control in the
+ * drawing order. If the argument is null, then the receiver
+ * is moved to the top of the drawing order. The control at
+ * the top of the drawing order will not be covered by other
+ * controls even if they occupy intersecting areas.
+ *
+ * @param control the sibling control (or null)
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_ARGUMENT - if the control has been disposed</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see Control#moveBelow
+ * @see Composite#getChildren
+ */
+public void moveAbove (Control control) {
+    checkWidget();
+    if (control !is null) {
+        if (control.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT);
+        if (parent !is control.parent) return;
+    }
+    setZOrder (control, true, true);
+}
+
+/**
+ * Moves the receiver below the specified control in the
+ * drawing order. If the argument is null, then the receiver
+ * is moved to the bottom of the drawing order. The control at
+ * the bottom of the drawing order will be covered by all other
+ * controls which occupy intersecting areas.
+ *
+ * @param control the sibling control (or null)
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_ARGUMENT - if the control has been disposed</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see Control#moveAbove
+ * @see Composite#getChildren
+ */
+public void moveBelow (Control control) {
+    checkWidget();
+    if (control !is null) {
+        if (control.isDisposed ()) error(SWT.ERROR_INVALID_ARGUMENT);
+        if (parent !is control.parent) return;
+    }
+    setZOrder (control, false, true);
+}
+
+void moveChildren (int oldWidth) {
+}
+
+/**
+ * Causes the receiver to be resized to its preferred size.
+ * For a composite, this involves computing the preferred size
+ * from its layout, if there is one.
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #computeSize(int, int, bool)
+ */
+public void pack () {
+    pack (true);
+}
+
+/**
+ * Causes the receiver to be resized to its preferred size.
+ * For a composite, this involves computing the preferred size
+ * from its layout, if there is one.
+ * <p>
+ * If the changed flag is <code>true</code>, it indicates that the receiver's
+ * <em>contents</em> have changed, therefore any caches that a layout manager
+ * containing the control may have been keeping need to be flushed. When the
+ * control is resized, the changed flag will be <code>false</code>, so layout
+ * manager caches can be retained.
+ * </p>
+ *
+ * @param changed whether or not the receiver's contents have changed
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #computeSize(int, int, bool)
+ */
+public void pack (bool changed) {
+    setSize (computeSize (SWT.DEFAULT, SWT.DEFAULT, changed));
+}
+
+/**
+ * Sets the layout data associated with the receiver to the argument.
+ *
+ * @param layoutData the new layout data for the receiver.
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setLayoutData (Object layoutData) {
+    checkWidget();
+    this.layoutData = layoutData;
+}
+
+/**
+ * Returns a point which is the result of converting the
+ * argument, which is specified in display relative coordinates,
+ * to coordinates relative to the receiver.
+ * <p>
+ * @param x the x coordinate to be translated
+ * @param y the y coordinate to be translated
+ * @return the translated coordinates
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @since 2.1
+ */
+public Point toControl (int x, int y) {
+    checkWidget ();
+    auto window = eventWindow ();
+    int origin_x, origin_y;
+    OS.gdk_window_get_origin (window, &origin_x, &origin_y);
+    x -= origin_x ;
+    y -= origin_y ;
+    if ((style & SWT.MIRRORED) !is 0) x = getClientWidth () - x;
+    return new Point (x, y);
+}
+
+/**
+ * Returns a point which is the result of converting the
+ * argument, which is specified in display relative coordinates,
+ * to coordinates relative to the receiver.
+ * <p>
+ * @param point the point to be translated (must not be null)
+ * @return the translated coordinates
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the point is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public Point toControl (Point point) {
+    checkWidget ();
+    if (point is null) error (SWT.ERROR_NULL_ARGUMENT);
+    return toControl (point.x, point.y);
+}
+
+/**
+ * Returns a point which is the result of converting the
+ * argument, which is specified in coordinates relative to
+ * the receiver, to display relative coordinates.
+ * <p>
+ * @param x the x coordinate to be translated
+ * @param y the y coordinate to be translated
+ * @return the translated coordinates
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @since 2.1
+ */
+public Point toDisplay (int x, int y) {
+    checkWidget();
+    auto window = eventWindow ();
+    int origin_x, origin_y;
+    OS.gdk_window_get_origin (window, &origin_x, &origin_y);
+    if ((style & SWT.MIRRORED) !is 0) x = getClientWidth () - x;
+    x += origin_x ;
+    y += origin_y ;
+    return new Point (x, y);
+}
+
+/**
+ * Returns a point which is the result of converting the
+ * argument, which is specified in coordinates relative to
+ * the receiver, to display relative coordinates.
+ * <p>
+ * @param point the point to be translated (must not be null)
+ * @return the translated coordinates
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the point is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public Point toDisplay (Point point) {
+    checkWidget();
+    if (point is null) error (SWT.ERROR_NULL_ARGUMENT);
+    return toDisplay (point.x, point.y);
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when the control is moved or resized, by sending
+ * it one of the messages defined in the <code>ControlListener</code>
+ * interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see ControlListener
+ * @see #removeControlListener
+ */
+public void addControlListener(ControlListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (SWT.Resize,typedListener);
+    addListener (SWT.Move,typedListener);
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when a drag gesture occurs, by sending it
+ * one of the messages defined in the <code>DragDetectListener</code>
+ * interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see DragDetectListener
+ * @see #removeDragDetectListener
+ *
+ * @since 3.3
+ */
+public void addDragDetectListener (DragDetectListener listener) {
+    checkWidget ();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (SWT.DragDetect,typedListener);
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when the control gains or loses focus, by sending
+ * it one of the messages defined in the <code>FocusListener</code>
+ * interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see FocusListener
+ * @see #removeFocusListener
+ */
+public void addFocusListener(FocusListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener(SWT.FocusIn,typedListener);
+    addListener(SWT.FocusOut,typedListener);
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when help events are generated for the control,
+ * by sending it one of the messages defined in the
+ * <code>HelpListener</code> interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see HelpListener
+ * @see #removeHelpListener
+ */
+public void addHelpListener (HelpListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (SWT.Help, typedListener);
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when keys are pressed and released on the system keyboard, by sending
+ * it one of the messages defined in the <code>KeyListener</code>
+ * interface.
+ * <p>
+ * When a key listener is added to a control, the control
+ * will take part in widget traversal.  By default, all
+ * traversal keys (such as the tab key and so on) are
+ * delivered to the control.  In order for a control to take
+ * part in traversal, it should listen for traversal events.
+ * Otherwise, the user can traverse into a control but not
+ * out.  Note that native controls such as table and tree
+ * implement key traversal in the operating system.  It is
+ * not necessary to add traversal listeners for these controls,
+ * unless you want to override the default traversal.
+ * </p>
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see KeyListener
+ * @see #removeKeyListener
+ */
+public void addKeyListener(KeyListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener(SWT.KeyUp,typedListener);
+    addListener(SWT.KeyDown,typedListener);
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when the platform-specific context menu trigger
+ * has occurred, by sending it one of the messages defined in
+ * the <code>MenuDetectListener</code> interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see MenuDetectListener
+ * @see #removeMenuDetectListener
+ *
+ * @since 3.3
+ */
+public void addMenuDetectListener (MenuDetectListener listener) {
+    checkWidget ();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (SWT.MenuDetect, typedListener);
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when mouse buttons are pressed and released, by sending
+ * it one of the messages defined in the <code>MouseListener</code>
+ * interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see MouseListener
+ * @see #removeMouseListener
+ */
+public void addMouseListener(MouseListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener(SWT.MouseDown,typedListener);
+    addListener(SWT.MouseUp,typedListener);
+    addListener(SWT.MouseDoubleClick,typedListener);
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when the mouse moves, by sending it one of the
+ * messages defined in the <code>MouseMoveListener</code>
+ * interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see MouseMoveListener
+ * @see #removeMouseMoveListener
+ */
+public void addMouseMoveListener(MouseMoveListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener(SWT.MouseMove,typedListener);
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when the mouse passes or hovers over controls, by sending
+ * it one of the messages defined in the <code>MouseTrackListener</code>
+ * interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see MouseTrackListener
+ * @see #removeMouseTrackListener
+ */
+public void addMouseTrackListener (MouseTrackListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (SWT.MouseEnter,typedListener);
+    addListener (SWT.MouseExit,typedListener);
+    addListener (SWT.MouseHover,typedListener);
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when the mouse wheel is scrolled, by sending
+ * it one of the messages defined in the
+ * <code>MouseWheelListener</code> interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see MouseWheelListener
+ * @see #removeMouseWheelListener
+ *
+ * @since 3.3
+ */
+public void addMouseWheelListener (MouseWheelListener listener) {
+    checkWidget ();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (SWT.MouseWheel, typedListener);
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when the receiver needs to be painted, by sending it
+ * one of the messages defined in the <code>PaintListener</code>
+ * interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see PaintListener
+ * @see #removePaintListener
+ */
+public void addPaintListener(PaintListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener(SWT.Paint,typedListener);
+}
+
+void addRelation (Control control) {
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when traversal events occur, by sending it
+ * one of the messages defined in the <code>TraverseListener</code>
+ * interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see TraverseListener
+ * @see #removeTraverseListener
+ */
+public void addTraverseListener (TraverseListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (SWT.Traverse,typedListener);
+}
+
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when the control is moved or resized.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see ControlListener
+ * @see #addControlListener
+ */
+public void removeControlListener (ControlListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (SWT.Move, listener);
+    eventTable.unhook (SWT.Resize, listener);
+}
+
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when a drag gesture occurs.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see DragDetectListener
+ * @see #addDragDetectListener
+ *
+ * @since 3.3
+ */
+public void removeDragDetectListener(DragDetectListener listener) {
+    checkWidget ();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (SWT.DragDetect, listener);
+}
+
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when the control gains or loses focus.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see FocusListener
+ * @see #addFocusListener
+ */
+public void removeFocusListener(FocusListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (SWT.FocusIn, listener);
+    eventTable.unhook (SWT.FocusOut, listener);
+}
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when the help events are generated for the control.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see HelpListener
+ * @see #addHelpListener
+ */
+public void removeHelpListener (HelpListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (SWT.Help, listener);
+}
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when keys are pressed and released on the system keyboard.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see KeyListener
+ * @see #addKeyListener
+ */
+public void removeKeyListener(KeyListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (SWT.KeyUp, listener);
+    eventTable.unhook (SWT.KeyDown, listener);
+}
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when the platform-specific context menu trigger has
+ * occurred.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see MenuDetectListener
+ * @see #addMenuDetectListener
+ *
+ * @since 3.3
+ */
+public void removeMenuDetectListener (MenuDetectListener listener) {
+    checkWidget ();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (SWT.MenuDetect, listener);
+}
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when mouse buttons are pressed and released.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see MouseListener
+ * @see #addMouseListener
+ */
+public void removeMouseListener (MouseListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (SWT.MouseDown, listener);
+    eventTable.unhook (SWT.MouseUp, listener);
+    eventTable.unhook (SWT.MouseDoubleClick, listener);
+}
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when the mouse moves.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see MouseMoveListener
+ * @see #addMouseMoveListener
+ */
+public void removeMouseMoveListener(MouseMoveListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (SWT.MouseMove, listener);
+}
+
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when the mouse passes or hovers over controls.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see MouseTrackListener
+ * @see #addMouseTrackListener
+ */
+public void removeMouseTrackListener(MouseTrackListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (SWT.MouseEnter, listener);
+    eventTable.unhook (SWT.MouseExit, listener);
+    eventTable.unhook (SWT.MouseHover, listener);
+}
+
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when the mouse wheel is scrolled.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see MouseWheelListener
+ * @see #addMouseWheelListener
+ *
+ * @since 3.3
+ */
+public void removeMouseWheelListener (MouseWheelListener listener) {
+    checkWidget ();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (SWT.MouseWheel, listener);
+}
+
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when the receiver needs to be painted.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see PaintListener
+ * @see #addPaintListener
+ */
+public void removePaintListener(PaintListener listener) {
+    checkWidget();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook(SWT.Paint, listener);
+}
+
+/*
+ * Remove "Labelled by" relations from the receiver.
+ */
+void removeRelation () {
+    if (!isDescribedByLabel ()) return;     /* there will not be any */
+    auto accessible = OS.gtk_widget_get_accessible (handle);
+    if (accessible is null) return;
+    auto set = ATK.atk_object_ref_relation_set (accessible);
+    int count = ATK.atk_relation_set_get_n_relations (set);
+    for (int i = 0; i < count; i++) {
+        auto relation = ATK.atk_relation_set_get_relation (set, 0);
+        ATK.atk_relation_set_remove (set, relation);
+    }
+    OS.g_object_unref (set);
+}
+
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when traversal events occur.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see TraverseListener
+ * @see #addTraverseListener
+ */
+public void removeTraverseListener(TraverseListener listener) {
+    checkWidget ();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (SWT.Traverse, listener);
+}
+
+/**
+ * Detects a drag and drop gesture.  This method is used
+ * to detect a drag gesture when called from within a mouse
+ * down listener.
+ *
+ * <p>By default, a drag is detected when the gesture
+ * occurs anywhere within the client area of a control.
+ * Some controls, such as tables and trees, override this
+ * behavior.  In addition to the operating system specific
+ * drag gesture, they require the mouse to be inside an
+ * item.  Custom widget writers can use <code>setDragDetect</code>
+ * to disable the default detection, listen for mouse down,
+ * and then call <code>dragDetect()</code> from within the
+ * listener to conditionally detect a drag.
+ * </p>
+ *
+ * @param event the mouse down event
+ *
+ * @return <code>true</code> if the gesture occurred, and <code>false</code> otherwise.
+ *
+ * @exception IllegalArgumentException <ul>
+ *   <li>ERROR_NULL_ARGUMENT when the event is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see DragDetectListener
+ * @see #addDragDetectListener
+ *
+ * @see #getDragDetect
+ * @see #setDragDetect
+ *
+ * @since 3.3
+ */
+public bool dragDetect (Event event) {
+    checkWidget ();
+    if (event is null) error (SWT.ERROR_NULL_ARGUMENT);
+    return dragDetect (event.button, event.count, event.stateMask, event.x, event.y);
+}
+
+/**
+ * Detects a drag and drop gesture.  This method is used
+ * to detect a drag gesture when called from within a mouse
+ * down listener.
+ *
+ * <p>By default, a drag is detected when the gesture
+ * occurs anywhere within the client area of a control.
+ * Some controls, such as tables and trees, override this
+ * behavior.  In addition to the operating system specific
+ * drag gesture, they require the mouse to be inside an
+ * item.  Custom widget writers can use <code>setDragDetect</code>
+ * to disable the default detection, listen for mouse down,
+ * and then call <code>dragDetect()</code> from within the
+ * listener to conditionally detect a drag.
+ * </p>
+ *
+ * @param event the mouse down event
+ *
+ * @return <code>true</code> if the gesture occurred, and <code>false</code> otherwise.
+ *
+ * @exception IllegalArgumentException <ul>
+ *   <li>ERROR_NULL_ARGUMENT when the event is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see DragDetectListener
+ * @see #addDragDetectListener
+ *
+ * @see #getDragDetect
+ * @see #setDragDetect
+ *
+ * @since 3.3
+ */
+public bool dragDetect (MouseEvent event) {
+    checkWidget ();
+    if (event is null) error (SWT.ERROR_NULL_ARGUMENT);
+    return dragDetect (event.button, event.count, event.stateMask, event.x, event.y);
+}
+
+bool dragDetect (int button, int count, int stateMask, int x, int y) {
+    if (button !is 1 || count !is 1) return false;
+    if (!dragDetect (x, y, false, null)) return false;
+    return sendDragEvent (button, stateMask, x, y, true);
+}
+
+bool dragDetect (int x, int y, bool filter, bool* consume) {
+    bool quit = false, dragging = false;
+    while (!quit) {
+        GdkEvent* eventPtr;
+        while (true) {
+            eventPtr = OS.gdk_event_get ();
+            if (eventPtr !is null) {
+                break;
+            } else {
+                try {Thread.sleep(0.050);} catch (Exception ex) {}
+            }
+        }
+        switch (cast(int)OS.GDK_EVENT_TYPE (eventPtr)) {
+            case OS.GDK_MOTION_NOTIFY: {
+                GdkEventMotion* gdkMotionEvent = cast(GdkEventMotion*)eventPtr;
+                if ((gdkMotionEvent.state & OS.GDK_BUTTON1_MASK) !is 0) {
+                    if (OS.gtk_drag_check_threshold (handle, x, y, cast(int) gdkMotionEvent.x, cast(int) gdkMotionEvent.y)) {
+                        dragging = true;
+                        quit = true;
+                    }
+                } else {
+                    quit = true;
+                }
+                int newX, newY;
+                OS.gdk_window_get_pointer (gdkMotionEvent.window, &newX, &newY, null);
+                break;
+            }
+            case OS.GDK_KEY_PRESS:
+            case OS.GDK_KEY_RELEASE: {
+                GdkEventKey* gdkEvent = cast(GdkEventKey*)eventPtr;
+                if (gdkEvent.keyval is OS.GDK_Escape) quit = true;
+                break;
+            }
+            case OS.GDK_BUTTON_RELEASE:
+            case OS.GDK_BUTTON_PRESS:
+            case OS.GDK_2BUTTON_PRESS:
+            case OS.GDK_3BUTTON_PRESS: {
+                OS.gdk_event_put (eventPtr);
+                quit = true;
+                break;
+            }
+            default:
+                OS.gtk_main_do_event (eventPtr);
+        }
+        OS.gdk_event_free (eventPtr);
+    }
+    return dragging;
+}
+
+bool filterKey (int keyval, GdkEventKey* event) {
+    auto imHandle = imHandle ();
+    if (imHandle !is null) {
+        return cast(bool)OS.gtk_im_context_filter_keypress (imHandle, event);
+    }
+    return false;
+}
+
+Control findBackgroundControl () {
+    if ((state & BACKGROUND) !is 0 || backgroundImage !is null) return this;
+    return (state & PARENT_BACKGROUND) !is 0 ? parent.findBackgroundControl () : null;
+}
+
+Menu [] findMenus (Control control) {
+    if (menu !is null && this !is control) return [menu];
+    return new Menu [0];
+}
+
+void fixChildren (Shell newShell, Shell oldShell, Decorations newDecorations, Decorations oldDecorations, Menu [] menus) {
+    oldShell.fixShell (newShell, this);
+    oldDecorations.fixDecorations (newDecorations, this, menus);
+}
+
+override int /*long*/ fixedMapProc (GtkWidget* widget) {
+    OS.GTK_WIDGET_SET_FLAGS (widget, OS.GTK_MAPPED);
+    auto widgetList = OS.gtk_container_get_children (cast(GtkContainer*)widget);
+    if (widgetList !is null) {
+        auto widgets = widgetList;
+        while (widgets !is null) {
+            auto child = cast(GtkWidget*)OS.g_list_data (widgets);
+            if (OS.GTK_WIDGET_VISIBLE (child) && OS.gtk_widget_get_child_visible (child) && !OS.GTK_WIDGET_MAPPED (child)) {
+                OS.gtk_widget_map (child);
+            }
+            widgets = cast(GList*)OS.g_list_next (widgets);
+        }
+        OS.g_list_free (widgetList);
+    }
+    if ((OS.GTK_WIDGET_FLAGS (widget) & OS.GTK_NO_WINDOW) is 0) {
+        OS.gdk_window_show_unraised (OS.GTK_WIDGET_WINDOW (widget));
+    }
+    return 0;
+}
+
+void fixModal(GtkWidget* group, GtkWidget* modalGroup) {
+}
+
+/**
+ * Forces the receiver to have the <em>keyboard focus</em>, causing
+ * all keyboard events to be delivered to it.
+ *
+ * @return <code>true</code> if the control got focus, and <code>false</code> if it was unable to.
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #setFocus
+ */
+public bool forceFocus () {
+    checkWidget();
+    if (display.focusEvent is SWT.FocusOut) return false;
+    Shell shell = getShell ();
+    shell.setSavedFocus (this);
+    if (!isEnabled () || !isVisible ()) return false;
+    shell.bringToTop (false);
+    return forceFocus (focusHandle ());
+}
+
+bool forceFocus (GtkWidget* focusHandle_) {
+    /* When the control is zero sized it must be realized */
+    OS.gtk_widget_realize (focusHandle_);
+    OS.gtk_widget_grab_focus (focusHandle_);
+    Shell shell = getShell ();
+    auto shellHandle = shell.shellHandle;
+    auto handle = OS.gtk_window_get_focus (cast(GtkWindow*)shellHandle);
+    while (handle !is null) {
+        if (handle is focusHandle_) return true;
+        Widget widget = display.getWidget (handle);
+        if (widget !is null && (null !is cast(Control)widget)) {
+            return widget is this;
+        }
+        handle = OS.gtk_widget_get_parent (handle);
+    }
+    return false;
+}
+
+/**
+ * Returns the receiver's background color.
+ *
+ * @return the background color
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public Color getBackground () {
+    checkWidget();
+    Control control = findBackgroundControl ();
+    if (control is null) control = this;
+    return Color.gtk_new (display, control.getBackgroundColor ());
+}
+
+GdkColor* getBackgroundColor () {
+    return getBgColor ();
+}
+
+/**
+ * Returns the receiver's background image.
+ *
+ * @return the background image
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @since 3.2
+ */
+public Image getBackgroundImage () {
+    checkWidget ();
+    Control control = findBackgroundControl ();
+    if (control is null) control = this;
+    return control.backgroundImage;
+}
+
+GdkColor* getBgColor () {
+    auto fontHandle_ = fontHandle ();
+    OS.gtk_widget_realize (fontHandle_);
+    GdkColor* color = new GdkColor ();
+    OS.gtk_style_get_bg (OS.gtk_widget_get_style (fontHandle_), OS.GTK_STATE_NORMAL, color);
+    return color;
+}
+
+GdkColor* getBaseColor () {
+    auto fontHandle_ = fontHandle ();
+    OS.gtk_widget_realize (fontHandle_);
+    GdkColor* color = new GdkColor ();
+    OS.gtk_style_get_base (OS.gtk_widget_get_style (fontHandle_), OS.GTK_STATE_NORMAL, color);
+    return color;
+}
+
+/**
+ * Returns the receiver's border width.
+ *
+ * @return the border width
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public int getBorderWidth () {
+    checkWidget();
+    return 0;
+}
+
+int getClientWidth () {
+    return 0;
+}
+
+/**
+ * Returns the receiver's cursor, or null if it has not been set.
+ * <p>
+ * When the mouse pointer passes over a control its appearance
+ * is changed to match the control's cursor.
+ * </p>
+ *
+ * @return the receiver's cursor or <code>null</code>
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @since 3.3
+ */
+public Cursor getCursor () {
+    checkWidget ();
+    return cursor;
+}
+
+/**
+ * Returns <code>true</code> if the receiver is detecting
+ * drag gestures, and  <code>false</code> otherwise.
+ *
+ * @return the receiver's drag detect state
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @since 3.3
+ */
+public bool getDragDetect () {
+    checkWidget ();
+    return (state & DRAG_DETECT) !is 0;
+}
+
+/**
+ * Returns <code>true</code> if the receiver is enabled, and
+ * <code>false</code> otherwise. A disabled control is typically
+ * not selectable from the user interface and draws with an
+ * inactive or "grayed" look.
+ *
+ * @return the receiver's enabled state
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #isEnabled
+ */
+public bool getEnabled () {
+    checkWidget ();
+    return (state & DISABLED) is 0;
+}
+
+/**
+ * Returns the font that the receiver will use to paint textual information.
+ *
+ * @return the receiver's font
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public Font getFont () {
+    checkWidget();
+    return font !is null ? font : defaultFont ();
+}
+
+PangoFontDescription* getFontDescription () {
+    auto fontHandle_ = fontHandle ();
+    OS.gtk_widget_realize (fontHandle_);
+    return OS.gtk_style_get_font_desc (OS.gtk_widget_get_style (fontHandle_));
+}
+
+/**
+ * Returns the foreground color that the receiver will use to draw.
+ *
+ * @return the receiver's foreground color
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public Color getForeground () {
+    checkWidget();
+    return Color.gtk_new (display, getForegroundColor ());
+}
+
+GdkColor* getForegroundColor () {
+    return getFgColor ();
+}
+
+GdkColor* getFgColor () {
+    auto fontHandle_ = fontHandle ();
+    OS.gtk_widget_realize (fontHandle_);
+    GdkColor* color = new GdkColor ();
+    OS.gtk_style_get_fg (OS.gtk_widget_get_style (fontHandle_), OS.GTK_STATE_NORMAL, color);
+    return color;
+}
+
+Point getIMCaretPos () {
+    return new Point (0, 0);
+}
+
+GdkColor* getTextColor () {
+    auto fontHandle_ = fontHandle ();
+    OS.gtk_widget_realize (fontHandle_);
+    GdkColor* color = new GdkColor ();
+    OS.gtk_style_get_text (OS.gtk_widget_get_style (fontHandle_), OS.GTK_STATE_NORMAL, color);
+    return color;
+}
+
+/**
+ * Returns layout data which is associated with the receiver.
+ *
+ * @return the receiver's layout data
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public Object getLayoutData () {
+    checkWidget();
+    return layoutData;
+}
+
+/**
+ * Returns the receiver's pop up menu if it has one, or null
+ * if it does not. All controls may optionally have a pop up
+ * menu that is displayed when the user requests one for
+ * the control. The sequence of key strokes, button presses
+ * and/or button releases that are used to request a pop up
+ * menu is platform specific.
+ *
+ * @return the receiver's menu
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public Menu getMenu () {
+    checkWidget();
+    return menu;
+}
+
+/**
+ * Returns the receiver's monitor.
+ *
+ * @return the receiver's monitor
+ *
+ * @since 3.0
+ */
+public org.eclipse.swt.widgets.Monitor.Monitor getMonitor () {
+    checkWidget();
+    org.eclipse.swt.widgets.Monitor.Monitor monitor = null;
+    auto screen = OS.gdk_screen_get_default ();
+    if (screen !is null) {
+        int monitorNumber = OS.gdk_screen_get_monitor_at_window (screen, paintWindow ());
+        GdkRectangle dest;
+        OS.gdk_screen_get_monitor_geometry (screen, monitorNumber, &dest);
+        monitor = new org.eclipse.swt.widgets.Monitor.Monitor ();
+        monitor.handle = monitorNumber;
+        monitor.x = dest.x;
+        monitor.y = dest.y;
+        monitor.width = dest.width;
+        monitor.height = dest.height;
+        Rectangle workArea = null;
+        if (monitorNumber is 0) workArea = display.getWorkArea ();
+        if (workArea !is null) {
+            monitor.clientX = workArea.x;
+            monitor.clientY = workArea.y;
+            monitor.clientWidth = workArea.width;
+            monitor.clientHeight = workArea.height;
+        } else {
+            monitor.clientX = monitor.x;
+            monitor.clientY = monitor.y;
+            monitor.clientWidth = monitor.width;
+            monitor.clientHeight = monitor.height;
+        }
+    } else {
+        monitor = display.getPrimaryMonitor ();
+    }
+    return monitor;
+}
+
+/**
+ * Returns the receiver's parent, which must be a <code>Composite</code>
+ * or null when the receiver is a shell that was created with null or
+ * a display for a parent.
+ *
+ * @return the receiver's parent
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public Composite getParent () {
+    checkWidget();
+    return parent;
+}
+
+Control [] getPath () {
+    int count = 0;
+    Shell shell = getShell ();
+    Control control = this;
+    while (control !is shell) {
+        count++;
+        control = control.parent;
+    }
+    control = this;
+    Control [] result = new Control [count];
+    while (control !is shell) {
+        result [--count] = control;
+        control = control.parent;
+    }
+    return result;
+}
+
+/**
+ * Returns the region that defines the shape of the control,
+ * or null if the control has the default shape.
+ *
+ * @return the region that defines the shape of the shell (or null)
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @since 3.4
+ */
+public Region getRegion () {
+    checkWidget ();
+    return region;
+}
+
+/**
+ * Returns the receiver's shell. For all controls other than
+ * shells, this simply returns the control's nearest ancestor
+ * shell. Shells return themselves, even if they are children
+ * of other shells.
+ *
+ * @return the receiver's shell
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #getParent
+ */
+public Shell getShell() {
+    checkWidget();
+    return _getShell();
+}
+
+Shell _getShell() {
+    return parent._getShell();
+}
+
+/**
+ * Returns the receiver's tool tip text, or null if it has
+ * not been set.
+ *
+ * @return the receiver's tool tip text
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public String getToolTipText () {
+    checkWidget();
+    return toolTipText;
+}
+/**
+ * Returns <code>true</code> if the receiver is visible, and
+ * <code>false</code> otherwise.
+ * <p>
+ * If one of the receiver's ancestors is not visible or some
+ * other condition makes the receiver not visible, this method
+ * may still indicate that it is considered visible even though
+ * it may not actually be showing.
+ * </p>
+ *
+ * @return the receiver's visibility state
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public bool getVisible () {
+    checkWidget();
+    return (state & HIDDEN) is 0;
+}
+
+override int /*long*/ gtk_button_press_event (GtkWidget* widget, GdkEventButton* event) {
+    return gtk_button_press_event (widget, event, true);
+}
+
+int /*long*/ gtk_button_press_event (GtkWidget* widget, GdkEventButton* gdkEvent, bool sendMouseDown) {
+    if (gdkEvent.type is OS.GDK_3BUTTON_PRESS) return 0;
+
+    /*
+    * When a shell is created with SWT.ON_TOP and SWT.NO_FOCUS,
+    * do not activate the shell when the user clicks on the
+    * the client area or on the border or a control within the
+    * shell that does not take focus.
+    */
+    Shell shell = _getShell ();
+    if (((shell.style & SWT.ON_TOP) !is 0) && (((shell.style & SWT.NO_FOCUS) is 0) || ((style & SWT.NO_FOCUS) is 0))) {
+        shell.forceActive();
+    }
+    int /*long*/ result = 0;
+    if (gdkEvent.type is OS.GDK_BUTTON_PRESS) {
+        display.clickCount = 1;
+        auto nextEvent = OS.gdk_event_peek ();
+        if (nextEvent !is null) {
+            int eventType = OS.GDK_EVENT_TYPE (nextEvent);
+            if (eventType is OS.GDK_2BUTTON_PRESS) display.clickCount = 2;
+            if (eventType is OS.GDK_3BUTTON_PRESS) display.clickCount = 3;
+            OS.gdk_event_free (nextEvent);
+        }
+        bool dragging = false;
+        if ((state & DRAG_DETECT) !is 0 && hooks (SWT.DragDetect)) {
+            if (gdkEvent.button is 1) {
+                bool consume = false;
+                if (dragDetect (cast(int) gdkEvent.x, cast(int) gdkEvent.y, true, &consume)) {
+                    dragging = true;
+                    if (consume ) result = 1;
+                }
+                if (isDisposed ()) return 1;
+            }
+        }
+        if (sendMouseDown && !sendMouseEvent (SWT.MouseDown, gdkEvent.button, display.clickCount, 0, false, gdkEvent.time, gdkEvent.x_root, gdkEvent.y_root, false, gdkEvent.state)) {
+            result = 1;
+        }
+        if (isDisposed ()) return 1;
+        if (dragging) {
+            sendDragEvent (gdkEvent.button, gdkEvent.state, cast(int) gdkEvent.x, cast(int) gdkEvent.y, false);
+            if (isDisposed ()) return 1;
+        }
+        /*
+        * Pop up the context menu in the button press event for widgets
+        * that have default operating system menus in order to stop the
+        * operating system from displaying the menu if necessary.
+        */
+        if ((state & MENU) !is 0) {
+            if (gdkEvent.button is 3) {
+                if (showMenu (cast(int)gdkEvent.x_root, cast(int)gdkEvent.y_root)) {
+                    result = 1;
+                }
+            }
+        }
+    } else {
+        display.clickCount = 2;
+        result = sendMouseEvent (SWT.MouseDoubleClick, gdkEvent.button, display.clickCount, 0, false, gdkEvent.time, gdkEvent.x_root, gdkEvent.y_root, false, gdkEvent.state) ? 0 : 1;
+        if (isDisposed ()) return 1;
+    }
+    if (!shell.isDisposed ()) shell.setActiveControl (this);
+    return result;
+}
+
+override int /*long*/ gtk_button_release_event (GtkWidget* widget, GdkEventButton* gdkEvent) {
+    /*
+    * Feature in GTK.  When button 4, 5, 6, or 7 is released, GTK
+    * does not deliver a corresponding GTK event.  Button 6 and 7
+    * are mapped to buttons 4 and 5 in SWT.  The fix is to change
+    * the button number of the event to a negative number so that
+    * it gets dispatched by GTK.  SWT has been modified to look
+    * for negative button numbers.
+    */
+    int button = gdkEvent.button;
+    switch (button) {
+        case -6: button = 4; break;
+        case -7: button = 5; break;
+        default:
+    }
+    return sendMouseEvent (SWT.MouseUp, button, display.clickCount, 0, false, gdkEvent.time, gdkEvent.x_root, gdkEvent.y_root, false, gdkEvent.state) ? 0 : 1;
+}
+
+override int /*long*/ gtk_commit (GtkIMContext* imcontext, char* text) {
+    char [] chars = fromStringz( text );
+    if (chars.length is 0) return 0;
+    sendIMKeyEvent (SWT.KeyDown, null, chars);
+    return 0;
+}
+
+override int /*long*/ gtk_enter_notify_event (GtkWidget*  widget, GdkEventCrossing* gdkEvent) {
+    if (OS.GTK_VERSION >= OS.buildVERSION (2, 12, 0)) {
+        /*
+         * Feature in GTK. Children of a shell will inherit and display the shell's
+         * tooltip if they do not have a tooltip of their own. The fix is to use the
+         * new tooltip API in GTK 2.12 to null the shell's tooltip when the control
+         * being entered does not have any tooltip text set.
+         */
+        char* buffer = null;
+        if (toolTipText !is null && toolTipText.length !is 0) {
+            char [] chars = fixMnemonic (toolTipText, false);
+            buffer = toStringz(chars);
+        }
+        auto toolHandle = getShell().handle;
+        OS.gtk_widget_set_tooltip_text (toolHandle, buffer);
+    }
+    if (display.currentControl is this) return 0;
+    if (gdkEvent.mode !is OS.GDK_CROSSING_NORMAL && gdkEvent.mode !is OS.GDK_CROSSING_UNGRAB) return 0;
+    if ((gdkEvent.state & (OS.GDK_BUTTON1_MASK | OS.GDK_BUTTON2_MASK | OS.GDK_BUTTON3_MASK)) !is 0) return 0;
+    if (display.currentControl !is null && !display.currentControl.isDisposed ()) {
+        display.removeMouseHoverTimeout (display.currentControl.handle);
+        display.currentControl.sendMouseEvent (SWT.MouseExit,  0, gdkEvent.time, gdkEvent.x_root, gdkEvent.y_root, false, gdkEvent.state);
+    }
+    if (!isDisposed ()) {
+        display.currentControl = this;
+        return sendMouseEvent (SWT.MouseEnter, 0, gdkEvent.time, gdkEvent.x_root, gdkEvent.y_root, false, gdkEvent.state) ? 0 : 1;
+    }
+    return 0;
+}
+
+override int /*long*/ gtk_event_after (GtkWidget*  widget, GdkEvent* gdkEvent) {
+    switch (cast(int)gdkEvent.type) {
+        case OS.GDK_BUTTON_PRESS: {
+            if (widget !is eventHandle ()) break;
+            /*
+            * Pop up the context menu in the event_after signal to allow
+            * the widget to process the button press.  This allows widgets
+            * such as GtkTreeView to select items before a menu is shown.
+            */
+            if ((state & MENU) is 0) {
+                GdkEventButton* gdkEventButton = cast(GdkEventButton*)gdkEvent;
+                if (gdkEventButton.button is 3) {
+                    showMenu (cast(int) gdkEventButton.x_root, cast(int) gdkEventButton.y_root);
+                }
+            }
+            break;
+        }
+        case OS.GDK_FOCUS_CHANGE: {
+            if (!isFocusHandle (widget)) break;
+            GdkEventFocus* gdkEventFocus = cast(GdkEventFocus*)gdkEvent;
+
+            /*
+             * Feature in GTK. The GTK combo box popup under some window managers
+             * is implemented as a GTK_MENU.  When it pops up, it causes the combo
+             * box to lose focus when focus is received for the menu.  The
+             * fix is to check the current grab handle and see if it is a GTK_MENU
+             * and ignore the focus event when the menu is both shown and hidden.
+             */
+            Display display = this.display;
+            if (gdkEventFocus.in_ !is 0) {
+                if (display.ignoreFocus) {
+                    display.ignoreFocus = false;
+                    break;
+                }
+            } else {
+                display.ignoreFocus = false;
+                auto grabHandle = OS.gtk_grab_get_current ();
+                if (grabHandle !is null) {
+                    if (OS.G_OBJECT_TYPE ( cast(GTypeInstance*)grabHandle) is OS.GTK_TYPE_MENU ()) {
+                        display.ignoreFocus = true;
+                        break;
+                    }
+                }
+            }
+
+            sendFocusEvent (gdkEventFocus.in_ !is 0 ? SWT.FocusIn : SWT.FocusOut);
+            break;
+        default:
+        }
+    }
+    return 0;
+}
+
+override int /*long*/ gtk_expose_event (GtkWidget*  widget, GdkEventExpose* gdkEvent) {
+    if ((state & OBSCURED) !is 0) return 0;
+    if (!hooks (SWT.Paint) && !filters (SWT.Paint)) return 0;
+    Event event = new Event ();
+    event.count = gdkEvent.count;
+    event.x = gdkEvent.area.x;
+    event.y = gdkEvent.area.y;
+    event.width = gdkEvent.area.width;
+    event.height = gdkEvent.area.height;
+    if ((style & SWT.MIRRORED) !is 0) event.x = getClientWidth () - event.width - event.x;
+    GCData data = new GCData ();
+    data.damageRgn = gdkEvent.region;
+    GC gc = event.gc = GC.gtk_new (this, data);
+    OS.gdk_gc_set_clip_region (gc.handle, gdkEvent.region);
+    sendEvent (SWT.Paint, event);
+    gc.dispose ();
+    event.gc = null;
+    return 0;
+}
+
+override int /*long*/ gtk_focus (GtkWidget* widget, int directionType) {
+    /* Stop GTK traversal for every widget */
+    return 1;
+}
+
+override int /*long*/ gtk_focus_in_event (GtkWidget*  widget, GdkEventFocus* event) {
+    // widget could be disposed at this point
+    if (handle !is null) {
+        Control oldControl = display.imControl;
+        if (oldControl !is this)  {
+            if (oldControl !is null && !oldControl.isDisposed ()) {
+                auto oldIMHandle = oldControl.imHandle ();
+                if (oldIMHandle !is null) OS.gtk_im_context_reset (oldIMHandle);
+            }
+        }
+        if (hooks (SWT.KeyDown) || hooks (SWT.KeyUp)) {
+            auto imHandle = imHandle ();
+            if (imHandle !is null) OS.gtk_im_context_focus_in (imHandle);
+        }
+    }
+    return 0;
+}
+
+override int /*long*/ gtk_focus_out_event (GtkWidget* widget, GdkEventFocus* event) {
+    // widget could be disposed at this point
+    if (handle !is null) {
+        if (hooks (SWT.KeyDown) || hooks (SWT.KeyUp)) {
+            auto imHandle = imHandle ();
+            if (imHandle !is null) {
+                OS.gtk_im_context_focus_out (imHandle);
+            }
+        }
+    }
+    return 0;
+}
+
+override int /*long*/ gtk_key_press_event (GtkWidget*  widget, GdkEventKey* gdkEvent) {
+    if (!hasFocus ()) return 0;
+
+    if (translateMnemonic (gdkEvent.keyval, gdkEvent)) return 1;
+    // widget could be disposed at this point
+    if (isDisposed ()) return 0;
+
+    if (filterKey (gdkEvent.keyval, gdkEvent)) return 1;
+    // widget could be disposed at this point
+    if (isDisposed ()) return 0;
+
+    if (translateTraversal (gdkEvent)) return 1;
+    // widget could be disposed at this point
+    if (isDisposed ()) return 0;
+    return super.gtk_key_press_event (widget, gdkEvent);
+}
+
+override int /*long*/ gtk_key_release_event (GtkWidget*  widget, GdkEventKey* event) {
+    if (!hasFocus ()) return 0;
+    auto imHandle = imHandle ();
+    if (imHandle !is null) {
+        if (OS.gtk_im_context_filter_keypress (imHandle, event)) return 1;
+    }
+    return super.gtk_key_release_event (widget, event);
+}
+
+override int /*long*/ gtk_leave_notify_event (GtkWidget* widget, GdkEventCrossing* gdkEvent) {
+    if (display.currentControl !is this) return 0;
+    display.removeMouseHoverTimeout (handle);
+    int result = 0;
+    if (sendLeaveNotify () || display.getCursorControl () is null) {
+        if (gdkEvent.mode !is OS.GDK_CROSSING_NORMAL && gdkEvent.mode !is OS.GDK_CROSSING_UNGRAB) return 0;
+        if ((gdkEvent.state & (OS.GDK_BUTTON1_MASK | OS.GDK_BUTTON2_MASK | OS.GDK_BUTTON3_MASK)) !is 0) return 0;
+        result = sendMouseEvent (SWT.MouseExit, 0, gdkEvent.time, gdkEvent.x_root, gdkEvent.y_root, false, gdkEvent.state) ? 0 : 1;
+        display.currentControl = null;
+    }
+    return result;
+}
+
+override int /*long*/ gtk_mnemonic_activate (GtkWidget* widget, int /*long*/ arg1) {
+    int result = 0;
+    auto eventPtr = OS.gtk_get_current_event ();
+    if (eventPtr !is null) {
+        GdkEventKey* keyEvent = cast(GdkEventKey*)eventPtr;
+        if (keyEvent.type is OS.GDK_KEY_PRESS) {
+            Control focusControl = display.getFocusControl ();
+            auto focusHandle_ = focusControl !is null ? focusControl.focusHandle () : null;
+            if (focusHandle_ !is null) {
+                display.mnemonicControl = this;
+                OS.gtk_widget_event (focusHandle_, eventPtr);
+                display.mnemonicControl = null;
+            }
+            result = 1;
+        }
+        OS.gdk_event_free (eventPtr);
+    }
+    return result;
+}
+
+override int /*long*/ gtk_motion_notify_event (GtkWidget* widget, GdkEventMotion* gdkEvent) {
+    if (this is display.currentControl && (hooks (SWT.MouseHover) || filters (SWT.MouseHover))) {
+        display.addMouseHoverTimeout (handle);
+    }
+    double x = gdkEvent.x_root, y = gdkEvent.y_root;
+    int state = gdkEvent.state;
+    if (gdkEvent.is_hint !is 0) {
+        int pointer_x, pointer_y;
+        int mask;
+        auto window = eventWindow ();
+        OS.gdk_window_get_pointer (window, &pointer_x, &pointer_y, &mask);
+        x = pointer_x;
+        y = pointer_y;
+        state = mask;
+    }
+    int result = sendMouseEvent (SWT.MouseMove, 0, gdkEvent.time, x, y, gdkEvent.is_hint !is 0, state) ? 0 : 1;
+    return result;
+}
+
+override int /*long*/ gtk_popup_menu (GtkWidget* widget) {
+    if (!hasFocus()) return 0;
+    int x, y ;
+    OS.gdk_window_get_pointer (null, &x, &y, null);
+    return showMenu (x, y) ? 1 : 0;
+}
+
+override int /*long*/ gtk_preedit_changed (GtkIMContext* imcontext) {
+    display.showIMWindow (this);
+    return 0;
+}
+
+override int /*long*/ gtk_realize (GtkWidget* widget) {
+    auto imHandle = imHandle ();
+    if (imHandle !is null) {
+        auto window = OS.GTK_WIDGET_WINDOW (paintHandle ());
+        OS.gtk_im_context_set_client_window (imHandle, window);
+    }
+    if (backgroundImage !is null) {
+        auto window = OS.GTK_WIDGET_WINDOW (paintHandle ());
+        if (window !is null) OS.gdk_window_set_back_pixmap (window, cast(GdkPixmap*)backgroundImage.pixmap, false);
+    }
+    return 0;
+}
+
+override int /*long*/ gtk_scroll_event (GtkWidget* widget, GdkEventScroll* gdkEvent) {
+    switch (cast(int)gdkEvent.direction) {
+        case OS.GDK_SCROLL_UP:
+            return sendMouseEvent (SWT.MouseWheel, 0, 3, SWT.SCROLL_LINE, true, gdkEvent.time, gdkEvent.x_root, gdkEvent.y_root, false, gdkEvent.state) ? 0 : 1;
+        case OS.GDK_SCROLL_DOWN:
+            return sendMouseEvent (SWT.MouseWheel, 0, -3, SWT.SCROLL_LINE, true, gdkEvent.time, gdkEvent.x_root, gdkEvent.y_root, false, gdkEvent.state) ? 0 : 1;
+        case OS.GDK_SCROLL_LEFT:
+            return sendMouseEvent (SWT.MouseDown, 4, gdkEvent.time, gdkEvent.x_root, gdkEvent.y_root, false, gdkEvent.state) ? 0 : 1;
+        case OS.GDK_SCROLL_RIGHT:
+            return sendMouseEvent (SWT.MouseDown, 5, gdkEvent.time, gdkEvent.x_root, gdkEvent.y_root, false, gdkEvent.state) ? 0 : 1;
+        default:
+    }
+    return 0;
+}
+
+override int /*long*/ gtk_show_help (GtkWidget* widget, int /*long*/ helpType) {
+    if (!hasFocus ()) return 0;
+    return sendHelpEvent (helpType) ? 1 : 0;
+}
+
+override int /*long*/ gtk_style_set (GtkWidget* widget, int /*long*/ previousStyle) {
+    if (backgroundImage !is null) {
+        setBackgroundPixmap (backgroundImage.pixmap);
+    }
+    return 0;
+}
+
+override int /*long*/ gtk_unrealize (GtkWidget* widget) {
+    auto imHandle = imHandle ();
+    if (imHandle !is null) OS.gtk_im_context_set_client_window (imHandle, null);
+    return 0;
+}
+
+override int /*long*/ gtk_visibility_notify_event (GtkWidget* widget, GdkEventVisibility* gdkEvent) {
+    auto paintWindow = paintWindow();
+    auto window = gdkEvent.window;
+    if (window is paintWindow) {
+        if (gdkEvent.state is OS.GDK_VISIBILITY_FULLY_OBSCURED) {
+            state |= OBSCURED;
+        } else {
+            if ((state & OBSCURED) !is 0) {
+                int width, height;
+                OS.gdk_drawable_get_size (cast(GdkDrawable*)window, &width, &height);
+                GdkRectangle rect;
+                rect.width = width;
+                rect.height = height;
+                OS.gdk_window_invalidate_rect (window, &rect, false);
+            }
+            state &= ~OBSCURED;
+        }
+    }
+    return 0;
+}
+
+/*no override*/ void gtk_widget_size_request (GtkWidget* widget, GtkRequisition* requisition) {
+    OS.gtk_widget_size_request (widget, requisition);
+}
+
+/**
+ * Invokes platform specific functionality to allocate a new GC handle.
+ * <p>
+ * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
+ * API for <code>Control</code>. It is marked public only so that it
+ * can be shared within the packages provided by SWT. It is not
+ * available on all platforms, and should never be called from
+ * application code.
+ * </p>
+ *
+ * @param data the platform specific GC data
+ * @return the platform specific GC handle
+ */
+public GdkGC* internal_new_GC (GCData data) {
+    checkWidget ();
+    auto window = paintWindow ();
+    if (window is null) SWT.error (SWT.ERROR_NO_HANDLES);
+    auto gdkGC = OS.gdk_gc_new (cast(GdkDrawable*)window);
+    if (gdkGC is null) error (SWT.ERROR_NO_HANDLES);
+    if (data !is null) {
+        int mask = SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT;
+        if ((data.style & mask) is 0) {
+            data.style |= style & (mask | SWT.MIRRORED);
+        } else {
+            if ((data.style & SWT.RIGHT_TO_LEFT) !is 0) {
+                data.style |= SWT.MIRRORED;
+            }
+        }
+        data.drawable = cast(GdkDrawable*)window;
+        data.device = display;
+        data.foreground = getForegroundColor ();
+        Control control = findBackgroundControl ();
+        if (control is null) control = this;
+        data.background = control.getBackgroundColor ();
+        data.font = font !is null ? font : defaultFont ();
+    }
+    return gdkGC;
+}
+
+GtkIMContext* imHandle () {
+    return null;
+}
+
+/**
+ * Invokes platform specific functionality to dispose a GC handle.
+ * <p>
+ * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
+ * API for <code>Control</code>. It is marked public only so that it
+ * can be shared within the packages provided by SWT. It is not
+ * available on all platforms, and should never be called from
+ * application code.
+ * </p>
+ *
+ * @param hDC the platform specific GC handle
+ * @param data the platform specific GC data
+ */
+public void internal_dispose_GC (GdkGC* gdkGC, GCData data) {
+    checkWidget ();
+    OS.g_object_unref (gdkGC);
+}
+
+/**
+ * Returns <code>true</code> if the underlying operating
+ * system supports this reparenting, otherwise <code>false</code>
+ *
+ * @return <code>true</code> if the widget can be reparented, otherwise <code>false</code>
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public bool isReparentable () {
+    checkWidget();
+    return true;
+}
+bool isShowing () {
+    /*
+    * This is not complete.  Need to check if the
+    * widget is obscurred by a parent or sibling.
+    */
+    if (!isVisible ()) return false;
+    Control control = this;
+    while (control !is null) {
+        Point size = control.getSize ();
+        if (size.x is 0 || size.y is 0) {
+            return false;
+        }
+        control = control.parent;
+    }
+    return true;
+}
+bool isTabGroup () {
+    Control [] tabList = parent._getTabList ();
+    if (tabList !is null) {
+        for (int i=0; i<tabList.length; i++) {
+            if (tabList [i] is this) return true;
+        }
+    }
+    int code = traversalCode (0, null);
+    if ((code & (SWT.TRAVERSE_ARROW_PREVIOUS | SWT.TRAVERSE_ARROW_NEXT)) !is 0) return false;
+    return (code & (SWT.TRAVERSE_TAB_PREVIOUS | SWT.TRAVERSE_TAB_NEXT)) !is 0;
+}
+bool isTabItem () {
+    Control [] tabList = parent._getTabList ();
+    if (tabList !is null) {
+        for (int i=0; i<tabList.length; i++) {
+            if (tabList [i] is this) return false;
+        }
+    }
+    int code = traversalCode (0, null);
+    return (code & (SWT.TRAVERSE_ARROW_PREVIOUS | SWT.TRAVERSE_ARROW_NEXT)) !is 0;
+}
+
+/**
+ * Returns <code>true</code> if the receiver is enabled and all
+ * ancestors up to and including the receiver's nearest ancestor
+ * shell are enabled.  Otherwise, <code>false</code> is returned.
+ * A disabled control is typically not selectable from the user
+ * interface and draws with an inactive or "grayed" look.
+ *
+ * @return the receiver's enabled state
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #getEnabled
+ */
+public bool isEnabled () {
+    checkWidget ();
+    return getEnabled () && parent.isEnabled ();
+}
+
+bool isFocusAncestor (Control control) {
+    while (control !is null && control !is this && !( null !is cast(Shell)control )) {
+        control = control.parent;
+    }
+    return control is this;
+}
+
+/**
+ * Returns <code>true</code> if the receiver has the user-interface
+ * focus, and <code>false</code> otherwise.
+ *
+ * @return the receiver's focus state
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public bool isFocusControl () {
+    checkWidget();
+    Control focusControl = display.focusControl;
+    if (focusControl !is null && !focusControl.isDisposed ()) {
+        return this is focusControl;
+    }
+    return hasFocus ();
+}
+
+/**
+ * Returns <code>true</code> if the receiver is visible and all
+ * ancestors up to and including the receiver's nearest ancestor
+ * shell are visible. Otherwise, <code>false</code> is returned.
+ *
+ * @return the receiver's visibility state
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #getVisible
+ */
+public bool isVisible () {
+    checkWidget();
+    return getVisible () && parent.isVisible ();
+}
+
+Decorations menuShell () {
+    return parent.menuShell ();
+}
+
+bool mnemonicHit (wchar key) {
+    return false;
+}
+
+bool mnemonicMatch (wchar key) {
+    return false;
+}
+
+override void register () {
+    super.register ();
+    if (fixedHandle !is null) display.addWidget (fixedHandle, this);
+    auto imHandle = imHandle ();
+    if (imHandle !is null) display.addWidget (cast(GtkWidget*)imHandle, this);
+}
+
+/**
+ * Causes the entire bounds of the receiver to be marked
+ * as needing to be redrawn. The next time a paint request
+ * is processed, the control will be completely painted,
+ * including the background.
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #update()
+ * @see PaintListener
+ * @see SWT#Paint
+ * @see SWT#NO_BACKGROUND
+ * @see SWT#NO_REDRAW_RESIZE
+ * @see SWT#NO_MERGE_PAINTS
+ * @see SWT#DOUBLE_BUFFERED
+ */
+public void redraw () {
+    checkWidget();
+    redraw (false);
+}
+
+void redraw (bool all) {
+//  checkWidget();
+    if (!OS.GTK_WIDGET_VISIBLE (topHandle ())) return;
+    redrawWidget (0, 0, 0, 0, true, all, false);
+}
+
+/**
+ * Causes the rectangular area of the receiver specified by
+ * the arguments to be marked as needing to be redrawn.
+ * The next time a paint request is processed, that area of
+ * the receiver will be painted, including the background.
+ * If the <code>all</code> flag is <code>true</code>, any
+ * children of the receiver which intersect with the specified
+ * area will also paint their intersecting areas. If the
+ * <code>all</code> flag is <code>false</code>, the children
+ * will not be painted.
+ *
+ * @param x the x coordinate of the area to draw
+ * @param y the y coordinate of the area to draw
+ * @param width the width of the area to draw
+ * @param height the height of the area to draw
+ * @param all <code>true</code> if children should redraw, and <code>false</code> otherwise
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #update()
+ * @see PaintListener
+ * @see SWT#Paint
+ * @see SWT#NO_BACKGROUND
+ * @see SWT#NO_REDRAW_RESIZE
+ * @see SWT#NO_MERGE_PAINTS
+ * @see SWT#DOUBLE_BUFFERED
+ */
+public void redraw (int x, int y, int width, int height, bool all) {
+    checkWidget();
+    if (!OS.GTK_WIDGET_VISIBLE (topHandle ())) return;
+    if ((style & SWT.MIRRORED) !is 0) x = getClientWidth () - width - x;
+    redrawWidget (x, y, width, height, false, all, false);
+}
+
+void redrawChildren () {
+}
+
+void redrawWidget (int x, int y, int width, int height, bool redrawAll, bool all, bool trim) {
+    if ((OS.GTK_WIDGET_FLAGS (handle) & OS.GTK_REALIZED) is 0) return;
+    auto window = paintWindow ();
+    GdkRectangle rect;
+    if (redrawAll) {
+        int w, h;
+        OS.gdk_drawable_get_size (cast(GdkDrawable*)window, &w, &h);
+        rect.width = w;
+        rect.height = h;
+    } else {
+        rect.x = x;
+        rect.y = y;
+        rect.width = width;
+        rect.height = height;
+    }
+    OS.gdk_window_invalidate_rect (window, &rect, all);
+}
+
+override void release (bool destroy) {
+    Control next = null, previous = null;
+    if (destroy && parent !is null) {
+        Control[] children = parent._getChildren ();
+        int index = 0;
+        while (index < children.length) {
+            if (children [index] is this) break;
+            index++;
+        }
+        if (0 < index && (index + 1) < children.length) {
+            next = children [index + 1];
+            previous = children [index - 1];
+        }
+    }
+    super.release (destroy);
+    if (destroy) {
+        if (previous !is null) previous.addRelation (next);
+    }
+}
+
+override void releaseHandle () {
+    super.releaseHandle ();
+    fixedHandle = null;
+    parent = null;
+}
+
+override void releaseParent () {
+    parent.removeControl (this);
+}
+
+override void releaseWidget () {
+    super.releaseWidget ();
+    if (display.currentControl is this) display.currentControl = null;
+    display.removeMouseHoverTimeout (handle);
+    auto imHandle = imHandle ();
+    if (imHandle !is null) {
+        OS.gtk_im_context_reset (imHandle);
+        OS.gtk_im_context_set_client_window (imHandle, null);
+    }
+    if (enableWindow !is null) {
+        OS.gdk_window_set_user_data (enableWindow, null);
+        OS.gdk_window_destroy (enableWindow);
+        enableWindow = null;
+    }
+    redrawWindow = null;
+    if (menu !is null && !menu.isDisposed ()) {
+        menu.dispose ();
+    }
+    menu = null;
+    cursor = null;
+    toolTipText = null;
+    layoutData = null;
+    accessible = null;
+    region = null;
+}
+
+bool sendDragEvent (int button, int stateMask, int x, int y, bool isStateMask) {
+    Event event = new Event ();
+    event.button = button;
+    event.x = x;
+    event.y = y;
+    if ((style & SWT.MIRRORED) !is 0) event.x = getClientWidth () - event.x;
+    if (isStateMask) {
+        event.stateMask = stateMask;
+    } else {
+        setInputState (event, stateMask);
+    }
+    postEvent (SWT.DragDetect, event);
+    if (isDisposed ()) return false;
+    return event.doit;
+}
+
+void sendFocusEvent (int type) {
+    Shell shell = _getShell ();
+    Display display = this.display;
+    display.focusControl = this;
+    display.focusEvent = type;
+    sendEvent (type);
+    display.focusControl = null;
+    display.focusEvent = SWT.None;
+    /*
+    * It is possible that the shell may be
+    * disposed at this point.  If this happens
+    * don't send the activate and deactivate
+    * events.
+    */
+    if (!shell.isDisposed ()) {
+        switch (type) {
+            case SWT.FocusIn:
+                shell.setActiveControl (this);
+                break;
+            case SWT.FocusOut:
+                if (shell !is display.activeShell) {
+                    shell.setActiveControl (null);
+                }
+                break;
+            default:
+        }
+    }
+}
+
+bool sendHelpEvent (int /*long*/ helpType) {
+    Control control = this;
+    while (control !is null) {
+        if (control.hooks (SWT.Help)) {
+            control.postEvent (SWT.Help);
+            return true;
+        }
+        control = control.parent;
+    }
+    return false;
+}
+
+bool sendLeaveNotify() {
+    return false;
+}
+
+bool sendMouseEvent (int type, int button, int time, double x, double y, bool is_hint, int state) {
+    return sendMouseEvent (type, button, 0, 0, false, time, x, y, is_hint, state);
+}
+
+bool sendMouseEvent (int type, int button, int count, int detail, bool send, int time, double x, double y, bool is_hint, int state) {
+    if (!hooks (type) && !filters (type)) return true;
+    Event event = new Event ();
+    event.time = time;
+    event.button = button;
+    event.detail = detail;
+    event.count = count;
+    if (is_hint) {
+        event.x = cast(int)x;
+        event.y = cast(int)y;
+    } else {
+        auto window = eventWindow ();
+        int origin_x, origin_y;
+        OS.gdk_window_get_origin (window, &origin_x, &origin_y);
+        event.x = cast(int)x - origin_x;
+        event.y = cast(int)y - origin_y;
+    }
+    if ((style & SWT.MIRRORED) !is 0) event.x = getClientWidth () - event.x;
+    setInputState (event, state);
+    if (send) {
+        sendEvent (type, event);
+        if (isDisposed ()) return false;
+    } else {
+        postEvent (type, event);
+    }
+    return event.doit;
+}
+
+void setBackground () {
+    if ((state & PARENT_BACKGROUND) !is 0 && (state & BACKGROUND) is 0 && backgroundImage is null) {
+        setParentBackground ();
+    } else {
+        setWidgetBackground ();
+    }
+    redrawWidget (0, 0, 0, 0, true, false, false);
+}
+
+/**
+ * Sets the receiver's background color to the color specified
+ * by the argument, or to the default system color for the control
+ * if the argument is null.
+ * <p>
+ * Note: This operation is a hint and may be overridden by the platform.
+ * For example, on Windows the background of a Button cannot be changed.
+ * </p>
+ * @param color the new color (or null)
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setBackground (Color color) {
+    checkWidget();
+    if (((state & BACKGROUND) is 0) && color is null) return;
+    GdkColor* gdkColor = null;
+    if (color !is null) {
+        if (color.isDisposed ()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
+        gdkColor = color.handle;
+    }
+    bool set = false;
+    if (gdkColor is null) {
+        auto style = OS.gtk_widget_get_modifier_style (handle);
+        set = (OS.gtk_rc_style_get_color_flags (style, OS.GTK_STATE_NORMAL) & OS.GTK_RC_BG) !is 0;
+    } else {
+        GdkColor* oldColor = getBackgroundColor ();
+        set = oldColor.pixel !is gdkColor.pixel;
+    }
+    if (set) {
+        if (color is null) {
+            state &= ~BACKGROUND;
+        } else {
+            state |= BACKGROUND;
+        }
+        setBackgroundColor (gdkColor);
+        redrawChildren ();
+    }
+}
+
+void setBackgroundColor (GtkWidget* handle, GdkColor* color) {
+    int index = OS.GTK_STATE_NORMAL;
+    auto style = OS.gtk_widget_get_modifier_style (handle);
+    auto ptr = OS.gtk_rc_style_get_bg_pixmap_name (style, index);
+    if (ptr !is null) OS.g_free (ptr);
+    String name = color is null ? "<parent>" : "<none>" ;
+    ptr = cast(char*)OS.g_malloc (name.length+1);
+    ptr[ 0 .. name.length ] = name;
+    ptr[ name.length ] = '\0';
+    OS.gtk_rc_style_set_bg_pixmap_name (style, index, ptr);
+    OS.gtk_rc_style_set_bg (style, index, color);
+    int flags = OS.gtk_rc_style_get_color_flags (style, index);
+    flags = (color is null) ? flags & ~OS.GTK_RC_BG : flags | OS.GTK_RC_BG;
+    OS.gtk_rc_style_set_color_flags (style, index, flags);
+    modifyStyle (handle, style);
+}
+
+void setBackgroundColor (GdkColor* color) {
+    setBackgroundColor (handle, color);
+}
+
+/**
+ * Sets the receiver's background image to the image specified
+ * by the argument, or to the default system color for the control
+ * if the argument is null.  The background image is tiled to fill
+ * the available space.
+ * <p>
+ * Note: This operation is a hint and may be overridden by the platform.
+ * For example, on Windows the background of a Button cannot be changed.
+ * </p>
+ * @param image the new image (or null)
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li>
+ *    <li>ERROR_INVALID_ARGUMENT - if the argument is not a bitmap</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @since 3.2
+ */
+public void setBackgroundImage (Image image) {
+    checkWidget ();
+    if (image !is null && image.isDisposed ()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
+    if (image is backgroundImage) return;
+    this.backgroundImage = image;
+    if (backgroundImage !is null) {
+        setBackgroundPixmap (backgroundImage.pixmap);
+        redrawWidget (0, 0, 0, 0, true, false, false);
+    } else {
+        setWidgetBackground ();
+    }
+    redrawChildren ();
+}
+
+void setBackgroundPixmap (GdkDrawable* pixmap) {
+    auto window = OS.GTK_WIDGET_WINDOW (paintHandle ());
+    if (window !is null) OS.gdk_window_set_back_pixmap (window, cast(GdkPixmap*)backgroundImage.pixmap, false);
+}
+
+/**
+ * If the argument is <code>true</code>, causes the receiver to have
+ * all mouse events delivered to it until the method is called with
+ * <code>false</code> as the argument.  Note that on some platforms,
+ * a mouse button must currently be down for capture to be assigned.
+ *
+ * @param capture <code>true</code> to capture the mouse, and <code>false</code> to release it
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setCapture (bool capture) {
+    checkWidget();
+    /* FIXME !!!!! */
+    /*
+    if (capture) {
+        OS.gtk_widget_grab_focus (handle);
+    } else {
+        OS.gtk_widget_grab_default (handle);
+    }
+    */
+}
+/**
+ * Sets the receiver's cursor to the cursor specified by the
+ * argument, or to the default cursor for that kind of control
+ * if the argument is null.
+ * <p>
+ * When the mouse pointer passes over a control its appearance
+ * is changed to match the control's cursor.
+ * </p>
+ *
+ * @param cursor the new cursor (or null)
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setCursor (Cursor cursor) {
+    checkWidget();
+    if (cursor !is null && cursor.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT);
+    this.cursor = cursor;
+    gtk_setCursor (cursor !is null ? cursor.handle : null);
+}
+
+void gtk_setCursor (GdkCursor* cursor) {
+    auto window = eventWindow ();
+    if (window !is null) {
+        OS.gdk_window_set_cursor (window, cursor);
+        if (!OS.GDK_WINDOWING_X11 ()) {
+            OS.gdk_flush ();
+        } else {
+            auto xDisplay = OS.GDK_DISPLAY ();
+            OS.XFlush (xDisplay);
+        }
+    }
+}
+
+/**
+ * Sets the receiver's drag detect state. If the argument is
+ * <code>true</code>, the receiver will detect drag gestures,
+ * otherwise these gestures will be ignored.
+ *
+ * @param dragDetect the new drag detect state
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @since 3.3
+ */
+public void setDragDetect (bool dragDetect) {
+    checkWidget ();
+    if (dragDetect) {
+        state |= DRAG_DETECT;
+    } else {
+        state &= ~DRAG_DETECT;
+    }
+}
+
+/**
+ * Enables the receiver if the argument is <code>true</code>,
+ * and disables it otherwise. A disabled control is typically
+ * not selectable from the user interface and draws with an
+ * inactive or "grayed" look.
+ *
+ * @param enabled the new enabled state
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setEnabled (bool enabled) {
+    checkWidget();
+    if (((state & DISABLED) is 0) is enabled) return;
+    Control control = null;
+    bool fixFocus_ = false;
+    if (!enabled) {
+        if (display.focusEvent !is SWT.FocusOut) {
+            control = display.getFocusControl ();
+            fixFocus_ = isFocusAncestor (control);
+        }
+    }
+    if (enabled) {
+        state &= ~DISABLED;
+    } else {
+        state |= DISABLED;
+    }
+    enableWidget (enabled);
+    if (isDisposed ()) return;
+    if (enabled) {
+        if (enableWindow !is null) {
+            OS.gdk_window_set_user_data (enableWindow, null);
+            OS.gdk_window_destroy (enableWindow);
+            enableWindow = null;
+        }
+    } else {
+        OS.gtk_widget_realize (handle);
+        auto parentHandle = parent.eventHandle ();
+        auto window = parent.eventWindow();
+        auto topHandle_ = topHandle ();
+        GdkWindowAttr attributes;
+        attributes.x = OS.GTK_WIDGET_X (topHandle_);
+        attributes.y = OS.GTK_WIDGET_Y (topHandle_);
+        attributes.width = (state & ZERO_WIDTH) !is 0 ? 0 : OS.GTK_WIDGET_WIDTH (topHandle_);
+        attributes.height = (state & ZERO_HEIGHT) !is 0 ? 0 : OS.GTK_WIDGET_HEIGHT (topHandle_);
+        attributes.event_mask = (0xFFFFFFFF & ~OS.ExposureMask);
+        attributes.wclass = OS.GDK_INPUT_ONLY;
+        attributes.window_type = OS.GDK_WINDOW_CHILD;
+        enableWindow = OS.gdk_window_new (window, &attributes, OS.GDK_WA_X | OS.GDK_WA_Y);
+        if (enableWindow !is null) {
+            OS.gdk_window_set_user_data (enableWindow, parentHandle);
+            if (!OS.GDK_WINDOWING_X11 ()) {
+                OS.gdk_window_raise (enableWindow);
+            } else {
+                auto topWindow = OS.GTK_WIDGET_WINDOW (topHandle_);
+                auto xDisplay = OS.gdk_x11_drawable_get_xdisplay (cast(GdkDrawable*)topWindow);
+                auto xWindow = OS.gdk_x11_drawable_get_xid (cast(GdkDrawable*)enableWindow);
+                int xScreen = OS.XDefaultScreen (xDisplay);
+                int flags = OS.CWStackMode | OS.CWSibling;
+                XWindowChanges changes;
+                changes.sibling = OS.gdk_x11_drawable_get_xid (cast(GdkDrawable*)topWindow);
+                changes.stack_mode = OS.Above;
+                OS.XReconfigureWMWindow (xDisplay, xWindow, xScreen, flags, &changes);
+            }
+            if (OS.GTK_WIDGET_VISIBLE (topHandle_)) OS.gdk_window_show_unraised (enableWindow);
+        }
+    }
+    if (fixFocus_) fixFocus (control);
+}
+
+/**
+ * Causes the receiver to have the <em>keyboard focus</em>,
+ * such that all keyboard events will be delivered to it.  Focus
+ * reassignment will respect applicable platform constraints.
+ *
+ * @return <code>true</code> if the control got focus, and <code>false</code> if it was unable to.
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #forceFocus
+ */
+public bool setFocus () {
+    checkWidget();
+    if ((style & SWT.NO_FOCUS) !is 0) return false;
+    return forceFocus ();
+}
+
+/**
+ * Sets the font that the receiver will use to paint textual information
+ * to the font specified by the argument, or to the default font for that
+ * kind of control if the argument is null.
+ *
+ * @param font the new font (or null)
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setFont (Font font) {
+    checkWidget();
+    if (((state & FONT) is 0) && font is null) return;
+    this.font = font;
+    PangoFontDescription* fontDesc;
+    if (font is null) {
+        fontDesc = defaultFont ().handle;
+    } else {
+        if (font.isDisposed ()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
+        fontDesc = font.handle;
+    }
+    if (font is null) {
+        state &= ~FONT;
+    } else {
+        state |= FONT;
+    }
+    setFontDescription (fontDesc);
+}
+
+void setFontDescription (PangoFontDescription* font) {
+    OS.gtk_widget_modify_font (handle, font);
+}
+
+/**
+ * Sets the receiver's foreground color to the color specified
+ * by the argument, or to the default system color for the control
+ * if the argument is null.
+ * <p>
+ * Note: This operation is a hint and may be overridden by the platform.
+ * </p>
+ * @param color the new color (or null)
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setForeground (Color color) {
+    checkWidget();
+    if (((state & FOREGROUND) is 0) && color is null) return;
+    GdkColor* gdkColor = null;
+    if (color !is null) {
+        if (color.isDisposed ()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
+        gdkColor = color.handle;
+    }
+    bool set = false;
+    if (gdkColor is null) {
+        auto style = OS.gtk_widget_get_modifier_style (handle);
+        set = (OS.gtk_rc_style_get_color_flags (style, OS.GTK_STATE_NORMAL) & OS.GTK_RC_FG) !is 0;
+    } else {
+        GdkColor* oldColor = getForegroundColor ();
+        set = oldColor.pixel !is gdkColor.pixel;
+    }
+    if (set) {
+        if (color is null) {
+            state &= ~FOREGROUND;
+        } else {
+            state |= FOREGROUND;
+        }
+        setForegroundColor (gdkColor);
+    }
+}
+
+void setForegroundColor (GdkColor* color) {
+    setForegroundColor (handle, color);
+}
+
+void setInitialBounds () {
+    if ((state & ZERO_WIDTH) !is 0 && (state & ZERO_HEIGHT) !is 0) {
+        /*
+        * Feature in GTK.  On creation, each widget's allocation is
+        * initialized to a position of (-1, -1) until the widget is
+        * first sized.  The fix is to set the value to (0, 0) as
+        * expected by SWT.
+        */
+        auto topHandle_ = topHandle ();
+        if ((parent.style & SWT.MIRRORED) !is 0) {
+            OS.GTK_WIDGET_SET_X (topHandle_, parent.getClientWidth ());
+        } else {
+            OS.GTK_WIDGET_SET_X (topHandle_, 0);
+        }
+        OS.GTK_WIDGET_SET_Y (topHandle_, 0);
+    } else {
+        resizeHandle (1, 1);
+        forceResize ();
+    }
+}
+
+/**
+ * Sets the receiver's pop up menu to the argument.
+ * All controls may optionally have a pop up
+ * menu that is displayed when the user requests one for
+ * the control. The sequence of key strokes, button presses
+ * and/or button releases that are used to request a pop up
+ * menu is platform specific.
+ * <p>
+ * Note: Disposing of a control that has a pop up menu will
+ * dispose of the menu.  To avoid this behavior, set the
+ * menu to null before the control is disposed.
+ * </p>
+ *
+ * @param menu the new pop up menu
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_MENU_NOT_POP_UP - the menu is not a pop up menu</li>
+ *    <li>ERROR_INVALID_PARENT - if the menu is not in the same widget tree</li>
+ *    <li>ERROR_INVALID_ARGUMENT - if the menu has been disposed</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setMenu (Menu menu) {
+    checkWidget();
+    if (menu !is null) {
+        if ((menu.style & SWT.POP_UP) is 0) {
+            error (SWT.ERROR_MENU_NOT_POP_UP);
+        }
+        if (menu.parent !is menuShell ()) {
+            error (SWT.ERROR_INVALID_PARENT);
+        }
+    }
+    this.menu = menu;
+}
+
+override void setOrientation () {
+    if ((style & SWT.RIGHT_TO_LEFT) !is 0) {
+        if (handle !is null) OS.gtk_widget_set_direction (handle, OS.GTK_TEXT_DIR_RTL);
+        if (fixedHandle !is null) OS.gtk_widget_set_direction (fixedHandle, OS.GTK_TEXT_DIR_RTL);
+    }
+}
+
+/**
+ * Changes the parent of the widget to be the one provided if
+ * the underlying operating system supports this feature.
+ * Returns <code>true</code> if the parent is successfully changed.
+ *
+ * @param parent the new parent for the control.
+ * @return <code>true</code> if the parent is changed and <code>false</code> otherwise.
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li>
+ *    <li>ERROR_NULL_ARGUMENT - if the parent is <code>null</code></li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ *  </ul>
+ */
+public bool setParent (Composite parent) {
+    checkWidget ();
+    if (parent is null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
+    if (parent.isDisposed()) SWT.error (SWT.ERROR_INVALID_ARGUMENT);
+    if (this.parent is parent) return true;
+    if (!isReparentable ()) return false;
+    auto topHandle_ = topHandle ();
+    int x = OS.GTK_WIDGET_X (topHandle_);
+    int width = (state & ZERO_WIDTH) !is 0 ? 0 : OS.GTK_WIDGET_WIDTH (topHandle_);
+    if ((this.parent.style & SWT.MIRRORED) !is 0) {
+        x =  this.parent.getClientWidth () - width - x;
+    }
+    if ((parent.style & SWT.MIRRORED) !is 0) {
+        x = parent.getClientWidth () - width - x;
+    }
+    int y = OS.GTK_WIDGET_Y (topHandle_);
+    releaseParent ();
+    Shell newShell = parent.getShell (), oldShell = getShell ();
+    Decorations newDecorations = parent.menuShell (), oldDecorations = menuShell ();
+    Menu [] menus = oldShell.findMenus (this);
+    if (oldShell !is newShell || oldDecorations !is newDecorations) {
+        fixChildren (newShell, oldShell, newDecorations, oldDecorations, menus);
+        newDecorations.fixAccelGroup ();
+        oldDecorations.fixAccelGroup ();
+    }
+    auto newParent = parent.parentingHandle();
+    OS.gtk_widget_reparent (topHandle_, newParent);
+    OS.gtk_fixed_move (cast(GtkFixed*)newParent, topHandle_, x, y);
+    this.parent = parent;
+    setZOrder (null, false, true);
+    return true;
+}
+
+void setParentBackground () {
+    setBackgroundColor (handle, null);
+    if (fixedHandle !is null) setBackgroundColor (fixedHandle, null);
+}
+
+void setParentWindow (GtkWidget* widget) {
+}
+
+bool setRadioSelection (bool value) {
+    return false;
+}
+
+/**
+ * If the argument is <code>false</code>, causes subsequent drawing
+ * operations in the receiver to be ignored. No drawing of any kind
+ * can occur in the receiver until the flag is set to true.
+ * Graphics operations that occurred while the flag was
+ * <code>false</code> are lost. When the flag is set to <code>true</code>,
+ * the entire widget is marked as needing to be redrawn.  Nested calls
+ * to this method are stacked.
+ * <p>
+ * Note: This operation is a hint and may not be supported on some
+ * platforms or for some widgets.
+ * </p>
+ *
+ * @param redraw the new redraw state
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #redraw(int, int, int, int, bool)
+ * @see #update()
+ */
+public void setRedraw (bool redraw) {
+    checkWidget();
+    if (redraw) {
+        if (--drawCount is 0) {
+            if (redrawWindow !is null) {
+                auto window = paintWindow ();
+                /* Explicitly hiding the window avoids flicker on GTK+ >= 2.6 */
+                OS.gdk_window_hide (redrawWindow);
+                OS.gdk_window_destroy (redrawWindow);
+                OS.gdk_window_set_events (window, OS.gtk_widget_get_events (paintHandle ()));
+                redrawWindow = null;
+            }
+        }
+    } else {
+        if (drawCount++ is 0) {
+            if ((OS.GTK_WIDGET_FLAGS (handle) & OS.GTK_REALIZED) !is 0) {
+                auto window = paintWindow ();
+                Rectangle rect = getBounds ();
+                GdkWindowAttr attributes;
+                attributes.width = rect.width;
+                attributes.height = rect.height;
+                attributes.event_mask = OS.GDK_EXPOSURE_MASK;
+                attributes.window_type = OS.GDK_WINDOW_CHILD;
+                redrawWindow = OS.gdk_window_new (window, &attributes, 0);
+                if (redrawWindow !is null) {
+                    int mouseMask = OS.GDK_BUTTON_PRESS_MASK | OS.GDK_BUTTON_RELEASE_MASK |
+                        OS.GDK_ENTER_NOTIFY_MASK | OS.GDK_LEAVE_NOTIFY_MASK |
+                        OS.GDK_POINTER_MOTION_MASK | OS.GDK_POINTER_MOTION_HINT_MASK |
+                        OS.GDK_BUTTON_MOTION_MASK | OS.GDK_BUTTON1_MOTION_MASK |
+                        OS.GDK_BUTTON2_MOTION_MASK | OS.GDK_BUTTON3_MOTION_MASK;
+                    OS.gdk_window_set_events (window, OS.gdk_window_get_events (window) & ~mouseMask);
+                    OS.gdk_window_set_back_pixmap (redrawWindow, null, false);
+                    OS.gdk_window_show (redrawWindow);
+                }
+            }
+        }
+    }
+}
+
+bool setTabGroupFocus (bool next) {
+    return setTabItemFocus (next);
+}
+bool setTabItemFocus (bool next) {
+    if (!isShowing ()) return false;
+    return forceFocus ();
+}
+
+/**
+ * Sets the receiver's tool tip text to the argument, which
+ * may be null indicating that no tool tip text should be shown.
+ *
+ * @param str the new tool tip text (or null)
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setToolTipText (String str) {
+    checkWidget();
+    setToolTipText (_getShell (), str);
+    toolTipText = str;
+}
+
+void setToolTipText (Shell shell, String newString) {
+    if (OS.GTK_VERSION >= OS.buildVERSION (2, 12, 0)) {
+        /*
+        * Feature in GTK.  In order to prevent children widgets
+        * from inheriting their parent's tooltip, the tooltip is
+        * a set on a shell only. In order to force the shell tooltip
+        * to update when a new tip string is set, the existing string
+        * in the tooltip is set to null, followed by running a query.
+        * The real tip text can then be set.
+        *
+        * Note that this will only run if the control for which the
+        * tooltip is being set is the current control (i.e. the control
+        * under the pointer).
+        */
+        if (display.currentControl is this) {
+            shell.setToolTipText (shell.handle, eventHandle (), newString);
+        }
+    } else {
+        shell.setToolTipText (eventHandle (), newString);
+    }
+}
+
+/**
+ * Marks the receiver as visible if the argument is <code>true</code>,
+ * and marks it invisible otherwise.
+ * <p>
+ * If one of the receiver's ancestors is not visible or some
+ * other condition makes the receiver not visible, marking
+ * it visible may not actually cause it to be displayed.
+ * </p>
+ *
+ * @param visible the new visibility state
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setVisible (bool visible) {
+    checkWidget();
+    if (((state & HIDDEN) is 0) is visible) return;
+    auto topHandle_ = topHandle();
+    if (visible) {
+        /*
+        * It is possible (but unlikely), that application
+        * code could have disposed the widget in the show
+        * event.  If this happens, just return.
+        */
+        sendEvent (SWT.Show);
+        if (isDisposed ()) return;
+        state &= ~HIDDEN;
+        if ((state & (ZERO_WIDTH | ZERO_HEIGHT)) is 0) {
+            if (enableWindow !is null) OS.gdk_window_show_unraised (enableWindow);
+            OS.gtk_widget_show (topHandle_);
+        }
+    } else {
+        /*
+        * Bug in GTK.  Invoking gtk_widget_hide() on a widget that has
+        * focus causes a focus_out_event to be sent. If the client disposes
+        * the widget inside the event, GTK GP's.  The fix is to reassign focus
+        * before hiding the widget.
+        *
+        * NOTE: In order to stop the same widget from taking focus,
+        * temporarily clear and set the GTK_VISIBLE flag.
+        */
+        Control control = null;
+        bool fixFocus_ = false;
+        if (display.focusEvent !is SWT.FocusOut) {
+            control = display.getFocusControl ();
+            fixFocus_ = isFocusAncestor (control);
+        }
+        state |= HIDDEN;
+        if (fixFocus_) {
+            OS.GTK_WIDGET_UNSET_FLAGS (topHandle_, OS.GTK_VISIBLE);
+            fixFocus (control);
+            if (isDisposed ()) return;
+            OS.GTK_WIDGET_SET_FLAGS (topHandle_, OS.GTK_VISIBLE);
+        }
+        OS.gtk_widget_hide (topHandle_);
+        if (isDisposed ()) return;
+        if (enableWindow !is null) OS.gdk_window_hide (enableWindow);
+        sendEvent (SWT.Hide);
+    }
+}
+
+void setZOrder (Control sibling, bool above, bool fixRelations) {
+     setZOrder (sibling, above, fixRelations, true);
+}
+
+void setZOrder (Control sibling, bool above, bool fixRelations, bool fixChildren) {
+    int index = 0, siblingIndex = 0, oldNextIndex = -1;
+    Control[] children = null;
+    if (fixRelations) {
+        /* determine the receiver's and sibling's indexes in the parent */
+        children = parent._getChildren ();
+        while (index < children.length) {
+            if (children [index] is this) break;
+            index++;
+        }
+        if (sibling !is null) {
+            while (siblingIndex < children.length) {
+                if (children [siblingIndex] is sibling) break;
+                siblingIndex++;
+            }
+        }
+        /* remove "Labelled by" relationships that will no longer be valid */
+        removeRelation ();
+        if (index + 1 < children.length) {
+            oldNextIndex = index + 1;
+            children [oldNextIndex].removeRelation ();
+        }
+        if (sibling !is null) {
+            if (above) {
+                sibling.removeRelation ();
+            } else {
+                if (siblingIndex + 1 < children.length) {
+                    children [siblingIndex + 1].removeRelation ();
+                }
+            }
+        }
+    }
+
+    auto topHandle_ = topHandle ();
+    auto siblingHandle = sibling !is null ? sibling.topHandle () : null;
+    auto window = OS.GTK_WIDGET_WINDOW (topHandle_);
+    if (window !is null) {
+        GdkWindow* siblingWindow;
+        if (sibling !is null) {
+            if (above && sibling.enableWindow !is null) {
+                siblingWindow = enableWindow;
+            } else {
+                siblingWindow = OS.GTK_WIDGET_WINDOW (siblingHandle);
+            }
+        }
+        auto redrawWindow = fixChildren ? parent.redrawWindow : null;
+        if (!OS.GDK_WINDOWING_X11 () || (siblingWindow is null && (!above || redrawWindow is null))) {
+            if (above) {
+                OS.gdk_window_raise (window);
+                if (redrawWindow !is null) OS.gdk_window_raise (redrawWindow);
+                if (enableWindow !is null) OS.gdk_window_raise (enableWindow);
+            } else {
+                if (enableWindow !is null) OS.gdk_window_lower (enableWindow);
+                OS.gdk_window_lower (window);
+            }
+        } else {
+            XWindowChanges changes;
+            changes.sibling = OS.gdk_x11_drawable_get_xid (cast(GdkDrawable*)(siblingWindow !is null ? siblingWindow : redrawWindow));
+            changes.stack_mode = above ? OS.Above : OS.Below;
+            if (redrawWindow !is null && siblingWindow is null) changes.stack_mode = OS.Below;
+            auto xDisplay = OS.gdk_x11_drawable_get_xdisplay (cast(GdkDrawable*)window);
+            auto xWindow = OS.gdk_x11_drawable_get_xid (cast(GdkDrawable*)window);
+            int xScreen = OS.XDefaultScreen (xDisplay);
+            int flags = OS.CWStackMode | OS.CWSibling;
+            /*
+            * Feature in X. If the receiver is a top level, XConfigureWindow ()
+            * will fail (with a BadMatch error) for top level shells because top
+            * level shells are reparented by the window manager and do not share
+            * the same X window parent.  This is the correct behavior but it is
+            * unexpected.  The fix is to use XReconfigureWMWindow () instead.
+            * When the receiver is not a top level shell, XReconfigureWMWindow ()
+            * behaves the same as XConfigureWindow ().
+            */
+            OS.XReconfigureWMWindow (xDisplay, xWindow, xScreen, flags, &changes);
+            if (enableWindow !is null) {
+                changes.sibling = OS.gdk_x11_drawable_get_xid (cast(GdkDrawable*)window);
+                changes.stack_mode = OS.Above;
+                xWindow = OS.gdk_x11_drawable_get_xid (cast(GdkDrawable*)enableWindow);
+                OS.XReconfigureWMWindow (xDisplay, xWindow, xScreen, flags, &changes);
+            }
+        }
+    }
+    if (fixChildren) {
+        if (above) {
+            parent.moveAbove (topHandle_, siblingHandle);
+        } else {
+            parent.moveBelow (topHandle_, siblingHandle);
+        }
+    }
+    /*  Make sure that the parent internal windows are on the bottom of the stack   */
+    if (!above && fixChildren)  parent.fixZOrder ();
+
+    if (fixRelations) {
+        /* determine the receiver's new index in the parent */
+        if (sibling !is null) {
+            if (above) {
+                index = siblingIndex - (index < siblingIndex ? 1 : 0);
+            } else {
+                index = siblingIndex + (siblingIndex < index ? 1 : 0);
+            }
+        } else {
+            if (above) {
+                index = 0;
+            } else {
+                index = children.length - 1;
+            }
+        }
+
+        /* add new "Labelled by" relations as needed */
+        children = parent._getChildren ();
+        if (0 < index) {
+            children [index - 1].addRelation (this);
+        }
+        if (index + 1 < children.length) {
+            addRelation (children [index + 1]);
+        }
+        if (oldNextIndex !is -1) {
+            if (oldNextIndex <= index) oldNextIndex--;
+            /* the last two conditions below ensure that duplicate relations are not hooked */
+            if (0 < oldNextIndex && oldNextIndex !is index && oldNextIndex !is index + 1) {
+                children [oldNextIndex - 1].addRelation (children [oldNextIndex]);
+            }
+        }
+    }
+}
+
+void setWidgetBackground  () {
+    if (fixedHandle !is null) {
+        auto style = OS.gtk_widget_get_modifier_style (fixedHandle);
+        modifyStyle (fixedHandle, style);
+    }
+    auto style = OS.gtk_widget_get_modifier_style (handle);
+    modifyStyle (handle, style);
+}
+
+bool showMenu (int x, int y) {
+    Event event = new Event ();
+    event.x = x;
+    event.y = y;
+    sendEvent (SWT.MenuDetect, event);
+    if (event.doit) {
+        if (menu !is null && !menu.isDisposed ()) {
+            bool hooksKeys = hooks (SWT.KeyDown) || hooks (SWT.KeyUp);
+            menu.createIMMenu (hooksKeys ? imHandle() : null);
+            if (event.x !is x || event.y !is y) {
+                menu.setLocation (event.x, event.y);
+            }
+            menu.setVisible (true);
+            return true;
+        }
+    }
+    return false;
+}
+
+void showWidget () {
+    // Comment this line to disable zero-sized widgets
+    state |= ZERO_WIDTH | ZERO_HEIGHT;
+    auto topHandle_ = topHandle ();
+    auto parentHandle = parent.parentingHandle ();
+    parent.setParentWindow (topHandle_);
+    OS.gtk_container_add (cast(GtkContainer*)parentHandle, topHandle_);
+    if (handle !is null && handle !is topHandle_) OS.gtk_widget_show (handle);
+    if ((state & (ZERO_WIDTH | ZERO_HEIGHT)) is 0) {
+        if (fixedHandle !is null) OS.gtk_widget_show (fixedHandle);
+    }
+    if (fixedHandle !is null) fixStyle (fixedHandle);
+}
+
+void sort (int [] items) {
+    /* Shell Sort from K&R, pg 108 */
+    int length = items.length;
+    for (int gap=length/2; gap>0; gap/=2) {
+        for (int i=gap; i<length; i++) {
+            for (int j=i-gap; j>=0; j-=gap) {
+                if (items [j] <= items [j + gap]) {
+                    int swap = items [j];
+                    items [j] = items [j + gap];
+                    items [j + gap] = swap;
+                }
+            }
+        }
+    }
+}
+
+/**
+ * Based on the argument, perform one of the expected platform
+ * traversal action. The argument should be one of the constants:
+ * <code>SWT.TRAVERSE_ESCAPE</code>, <code>SWT.TRAVERSE_RETURN</code>,
+ * <code>SWT.TRAVERSE_TAB_NEXT</code>, <code>SWT.TRAVERSE_TAB_PREVIOUS</code>,
+ * <code>SWT.TRAVERSE_ARROW_NEXT</code> and <code>SWT.TRAVERSE_ARROW_PREVIOUS</code>.
+ *
+ * @param traversal the type of traversal
+ * @return true if the traversal succeeded
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public bool traverse (int traversal) {
+    checkWidget ();
+    Event event = new Event ();
+    event.doit = true;
+    event.detail = traversal;
+    return traverse (event);
+}
+
+bool translateMnemonic (Event event, Control control) {
+    if (control is this) return false;
+    if (!isVisible () || !isEnabled ()) return false;
+    event.doit = this is display.mnemonicControl || mnemonicMatch (event.character);
+    return traverse (event);
+}
+
+bool translateMnemonic (int keyval, GdkEventKey* gdkEvent) {
+    int key = OS.gdk_keyval_to_unicode (keyval);
+    if (key < 0x20) return false;
+    if (gdkEvent.state is 0) {
+        int code = traversalCode (keyval, gdkEvent);
+        if ((code & SWT.TRAVERSE_MNEMONIC) is 0) return false;
+    } else {
+        Shell shell = _getShell ();
+        int mask = OS.GDK_CONTROL_MASK | OS.GDK_SHIFT_MASK | OS.GDK_MOD1_MASK;
+        if ((gdkEvent.state & mask) !is OS.gtk_window_get_mnemonic_modifier (cast(GtkWindow*)shell.shellHandle)) return false;
+    }
+    Decorations shell = menuShell ();
+    if (shell.isVisible () && shell.isEnabled ()) {
+        Event event = new Event ();
+        event.detail = SWT.TRAVERSE_MNEMONIC;
+        if (setKeyState (event, gdkEvent)) {
+            return translateMnemonic (event, null) || shell.translateMnemonic (event, this);
+        }
+    }
+    return false;
+}
+
+bool translateTraversal (GdkEventKey* keyEvent) {
+    int detail = SWT.TRAVERSE_NONE;
+    int key = keyEvent.keyval;
+    int code = traversalCode (key, keyEvent);
+    bool all = false;
+    switch (key) {
+        case OS.GDK_Escape: {
+            all = true;
+            detail = SWT.TRAVERSE_ESCAPE;
+            break;
+        }
+        case OS.GDK_KP_Enter:
+        case OS.GDK_Return: {
+            all = true;
+            detail = SWT.TRAVERSE_RETURN;
+            break;
+        }
+        case OS.GDK_ISO_Left_Tab:
+        case OS.GDK_Tab: {
+            bool next = (keyEvent.state & OS.GDK_SHIFT_MASK) is 0;
+            detail = next ? SWT.TRAVERSE_TAB_NEXT : SWT.TRAVERSE_TAB_PREVIOUS;
+            break;
+        }
+        case OS.GDK_Up:
+        case OS.GDK_Left:
+        case OS.GDK_Down:
+        case OS.GDK_Right: {
+            bool next = key is OS.GDK_Down || key is OS.GDK_Right;
+            if (parent !is null && (parent.style & SWT.MIRRORED) !is 0) {
+                if (key is OS.GDK_Left || key is OS.GDK_Right) next = !next;
+            }
+            detail = next ? SWT.TRAVERSE_ARROW_NEXT : SWT.TRAVERSE_ARROW_PREVIOUS;
+            break;
+        }
+        case OS.GDK_Page_Up:
+        case OS.GDK_Page_Down: {
+            all = true;
+            if ((keyEvent.state & OS.GDK_CONTROL_MASK) is 0) return false;
+            detail = key is OS.GDK_Page_Down ? SWT.TRAVERSE_PAGE_NEXT : SWT.TRAVERSE_PAGE_PREVIOUS;
+            break;
+        }
+        default:
+            return false;
+    }
+    Event event = new Event ();
+    event.doit = (code & detail) !is 0;
+    event.detail = detail;
+    event.time = keyEvent.time;
+    if (!setKeyState (event, keyEvent)) return false;
+    Shell shell = getShell ();
+    Control control = this;
+    do {
+        if (control.traverse (event)) return true;
+        if (!event.doit && control.hooks (SWT.Traverse)) return false;
+        if (control is shell) return false;
+        control = control.parent;
+    } while (all && control !is null);
+    return false;
+}
+
+int traversalCode (int key, GdkEventKey* event) {
+    int code = SWT.TRAVERSE_RETURN | SWT.TRAVERSE_TAB_NEXT |  SWT.TRAVERSE_TAB_PREVIOUS | SWT.TRAVERSE_PAGE_NEXT | SWT.TRAVERSE_PAGE_PREVIOUS;
+    Shell shell = getShell ();
+    if (shell.parent !is null) code |= SWT.TRAVERSE_ESCAPE;
+    return code;
+}
+
+bool traverse (Event event) {
+    /*
+    * It is possible (but unlikely), that application
+    * code could have disposed the widget in the traverse
+    * event.  If this happens, return true to stop further
+    * event processing.
+    */
+    sendEvent (SWT.Traverse, event);
+    if (isDisposed ()) return true;
+    if (!event.doit) return false;
+    switch (event.detail) {
+        case SWT.TRAVERSE_NONE:         return true;
+        case SWT.TRAVERSE_ESCAPE:           return traverseEscape ();
+        case SWT.TRAVERSE_RETURN:           return traverseReturn ();
+        case SWT.TRAVERSE_TAB_NEXT:     return traverseGroup (true);
+        case SWT.TRAVERSE_TAB_PREVIOUS: return traverseGroup (false);
+        case SWT.TRAVERSE_ARROW_NEXT:       return traverseItem (true);
+        case SWT.TRAVERSE_ARROW_PREVIOUS:   return traverseItem (false);
+        case SWT.TRAVERSE_MNEMONIC:     return traverseMnemonic (event.character);
+        case SWT.TRAVERSE_PAGE_NEXT:        return traversePage (true);
+        case SWT.TRAVERSE_PAGE_PREVIOUS:    return traversePage (false);
+        default:
+    }
+    return false;
+}
+
+bool traverseEscape () {
+    return false;
+}
+
+bool traverseGroup (bool next) {
+    Control root = computeTabRoot ();
+    Control group = computeTabGroup ();
+    Control [] list = root.computeTabList ();
+    int length = list.length;
+    int index = 0;
+    while (index < length) {
+        if (list [index] is group) break;
+        index++;
+    }
+    /*
+    * It is possible (but unlikely), that application
+    * code could have disposed the widget in focus in
+    * or out events.  Ensure that a disposed widget is
+    * not accessed.
+    */
+    if (index is length) return false;
+    int start = index, offset = (next) ? 1 : -1;
+    while ((index = ((index + offset + length) % length)) !is start) {
+        Control control = list [index];
+        if (!control.isDisposed () && control.setTabGroupFocus (next)) {
+            return true;
+        }
+    }
+    if (group.isDisposed ()) return false;
+    return group.setTabGroupFocus (next);
+}
+
+bool traverseItem (bool next) {
+    Control [] children = parent._getChildren ();
+    int length = children.length;
+    int index = 0;
+    while (index < length) {
+        if (children [index] is this) break;
+        index++;
+    }
+    /*
+    * It is possible (but unlikely), that application
+    * code could have disposed the widget in focus in
+    * or out events.  Ensure that a disposed widget is
+    * not accessed.
+    */
+    if (index is length) return false;
+    int start = index, offset = (next) ? 1 : -1;
+    while ((index = (index + offset + length) % length) !is start) {
+        Control child = children [index];
+        if (!child.isDisposed () && child.isTabItem ()) {
+            if (child.setTabItemFocus (next)) return true;
+        }
+    }
+    return false;
+}
+
+bool traverseReturn () {
+    return false;
+}
+
+bool traversePage (bool next) {
+    return false;
+}
+
+bool traverseMnemonic (char key) {
+    return mnemonicHit (key);
+}
+
+/**
+ * Forces all outstanding paint requests for the widget
+ * to be processed before this method returns. If there
+ * are no outstanding paint request, this method does
+ * nothing.
+ * <p>
+ * Note: This method does not cause a redraw.
+ * </p>
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see #redraw()
+ * @see #redraw(int, int, int, int, bool)
+ * @see PaintListener
+ * @see SWT#Paint
+ */
+public void update () {
+    checkWidget ();
+    update (false, true);
+}
+
+void update (bool all, bool flush) {
+//  checkWidget();
+    if (!OS.GTK_WIDGET_VISIBLE (topHandle ())) return;
+    if ((OS.GTK_WIDGET_FLAGS (handle) & OS.GTK_REALIZED) is 0) return;
+    auto window = paintWindow ();
+    if (flush) display.flushExposes (window, all);
+    OS.gdk_window_process_updates (window, all);
+    OS.gdk_flush ();
+}
+
+void updateBackgroundMode () {
+    int oldState = state & PARENT_BACKGROUND;
+    checkBackground ();
+    if (oldState !is (state & PARENT_BACKGROUND)) {
+        setBackground ();
+    }
+}
+
+void updateLayout (bool all) {
+    /* Do nothing */
+}
+
+override int /*long*/ windowProc (GtkWidget* handle, int /*long*/ arg0, int /*long*/ user_data) {
+    switch (cast(int)/*64*/user_data) {
+        case EXPOSE_EVENT_INVERSE: {
+            if ((OS.GTK_VERSION <  OS.buildVERSION (2, 8, 0)) && ((state & OBSCURED) is 0)) {
+                Control control = findBackgroundControl ();
+                if (control !is null && control.backgroundImage !is null) {
+                    GdkEventExpose* gdkEvent = cast(GdkEventExpose*)arg0;
+                    auto paintWindow = paintWindow();
+                    auto window = gdkEvent.window;
+                    if (window !is paintWindow) break;
+                    auto gdkGC = OS.gdk_gc_new (cast(GdkDrawable*)window);
+                    OS.gdk_gc_set_clip_region (gdkGC, gdkEvent.region);
+                    int dest_x, dest_y;
+                    OS.gtk_widget_translate_coordinates (paintHandle (), control.paintHandle (), 0, 0, &dest_x, &dest_y);
+                    OS.gdk_gc_set_fill (gdkGC, OS.GDK_TILED);
+                    OS.gdk_gc_set_ts_origin (gdkGC, -dest_x, -dest_y);
+                    OS.gdk_gc_set_tile (gdkGC, cast(GdkPixmap*)control.backgroundImage.pixmap);
+                    OS.gdk_draw_rectangle (cast(GdkDrawable*)window, gdkGC, 1, gdkEvent.area.x, gdkEvent.area.y, gdkEvent.area.width, gdkEvent.area.height);
+                    OS.g_object_unref (gdkGC);
+                }
+            }
+            break;
+        default:
+        }
+    }
+    return super.windowProc (handle, arg0, user_data);
+}
+}