--- a/doc/todo.txt	Tue Jan 15 20:14:47 2008 +0100
+++ b/doc/todo.txt	Tue Jan 15 21:19:03 2008 +0100
@@ -24,7 +24,8 @@
 
 Next Steps:
     * accessibility package (independant)
-    * Shell
+    * check global Thread.sleep(float)
+    * check global .equals
 
 EventTable
 
@@ -85,38 +86,38 @@
 widgets/Button                          // OKs
 widgets/Canvas                          // OKs
 widgets/Caret                           // OKs
-widgets/ColorDialog
-widgets/Combo
+widgets/ColorDialog                     // OK
+widgets/Combo                           // OK
 widgets/Composite                       // OKs
 widgets/Control                         // OKs
-widgets/CoolBar
-widgets/CoolItem
+widgets/CoolBar                         // OK
+widgets/CoolItem                        // OK
 widgets/DateTime
 widgets/Decorations                     // OKs
-widgets/Dialog
-widgets/DirectoryDialog
+widgets/Dialog                          // OK
+widgets/DirectoryDialog                 // OK
 widgets/Display                         // OKs
 widgets/Event                           // OKs
 widgets/EventTable                      // OKs
-widgets/ExpandBar
-widgets/ExpandItem
-widgets/FileDialog
-widgets/FontDialog
+widgets/ExpandBar                       // OK
+widgets/ExpandItem                      // OK
+widgets/FileDialog                      // OK
+widgets/FontDialog                      // OK
 widgets/Group                           // OKs
 widgets/ImageList                       // OKs
 widgets/Item                            // OKs
 widgets/Label                           // OKs
 widgets/Layout                          // OKs
-widgets/Link
+widgets/Link                            // OK
 widgets/List                            // OKs
 widgets/Listener                        // OKs
 widgets/Menu                            // OKs
 widgets/MenuItem                        // OKs
-widgets/MessageBox
+widgets/MessageBox                      // OK
 widgets/Monitor                         // OKs
-widgets/ProgressBar
+widgets/ProgressBar                     // OK
 widgets/RunnableLock                    // OKs
-widgets/Sash
+widgets/Sash                            // OK
 widgets/Scale                           // OKs
 widgets/Scrollable                      // OKs
 widgets/ScrollBar                       // OKs
@@ -130,8 +131,8 @@
 widgets/TableColumn
 widgets/TableItem
 widgets/Text                            // OKs
-widgets/ToolBar
-widgets/ToolItem
+widgets/ToolBar                         // OK
+widgets/ToolItem                        // OK
 widgets/ToolTip                         // OKs
 widgets/Tracker
 widgets/Tray                            // OKs
@@ -570,3 +571,5 @@
 
 
 
+
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/widgets/Tracker.d	Tue Jan 15 21:19:03 2008 +0100
@@ -0,0 +1,995 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 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
+ *******************************************************************************/
+module dwt.widgets.Tracker;
+
+
+
+import dwt.DWT;
+import dwt.DWTException;
+import dwt.events.ControlListener;
+import dwt.events.KeyListener;
+import dwt.graphics.Cursor;
+import dwt.graphics.Point;
+import dwt.graphics.Rectangle;
+import dwt.internal.gtk.OS;
+import dwt.widgets.Widget;
+import dwt.widgets.Composite;
+import dwt.widgets.Display;
+import dwt.widgets.TypedListener;
+import dwt.widgets.Event;
+
+import tango.core.Exception;
+import tango.core.Thread;
+
+/**
+ *  Instances of this class implement rubber banding rectangles that are
+ *  drawn onto a parent <code>Composite</code> or <code>Display</code>.
+ *  These rectangles can be specified to respond to mouse and key events
+ *  by either moving or resizing themselves accordingly.  Trackers are
+ *  typically used to represent window geometries in a lightweight manner.
+ *
+ * <dl>
+ * <dt><b>Styles:</b></dt>
+ * <dd>LEFT, RIGHT, UP, DOWN, RESIZE</dd>
+ * <dt><b>Events:</b></dt>
+ * <dd>Move, Resize</dd>
+ * </dl>
+ * <p>
+ * Note: Rectangle move behavior is assumed unless RESIZE is specified.
+ * </p><p>
+ * IMPORTANT: This class is <em>not</em> intended to be subclassed.
+ * </p>
+ */
+public class Tracker : Widget {
+    Composite parent;
+    GdkCursor* cursor, lastCursor;
+    GdkDrawable* window;
+    bool tracking, cancelled, grabbed, stippled;
+    Rectangle [] rectangles, proportions;
+    Rectangle bounds;
+    int cursorOrientation = DWT.NONE;
+    int oldX, oldY;
+
+    final static int STEPSIZE_SMALL = 1;
+    final static int STEPSIZE_LARGE = 9;
+
+/**
+ * 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>DWT</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>DWT</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 widget which will be the parent of the new instance (cannot be null)
+ * @param style the style of widget to construct
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
+ * </ul>
+ * @exception DWTException <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 DWT#LEFT
+ * @see DWT#RIGHT
+ * @see DWT#UP
+ * @see DWT#DOWN
+ * @see DWT#RESIZE
+ * @see Widget#checkSubclass
+ * @see Widget#getStyle
+ */
+public this (Composite parent, int style) {
+    super (parent, checkStyle(style));
+    this.parent = parent;
+}
+
+/**
+ * Constructs a new instance of this class given the display
+ * to create it on and a style value describing its behavior
+ * and appearance.
+ * <p>
+ * The style value is either one of the style constants defined in
+ * class <code>DWT</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>DWT</code> style constants. The class description
+ * lists the style constants that are applicable to the class.
+ * Style bits are also inherited from superclasses.
+ * </p><p>
+ * Note: Currently, null can be passed in for the display argument.
+ * This has the effect of creating the tracker on the currently active
+ * display if there is one. If there is no current display, the
+ * tracker is created on a "default" display. <b>Passing in null as
+ * the display argument is not considered to be good coding style,
+ * and may not be supported in a future release of DWT.</b>
+ * </p>
+ *
+ * @param display the display to create the tracker on
+ * @param style the style of control to construct
+ *
+ * @exception DWTException <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 DWT#LEFT
+ * @see DWT#RIGHT
+ * @see DWT#UP
+ * @see DWT#DOWN
+ */
+public this (Display display, int style) {
+    if (display is null) display = Display.getCurrent ();
+    if (display is null) display = Display.getDefault ();
+    if (!display.isValidThread ()) {
+        error (DWT.ERROR_THREAD_INVALID_ACCESS);
+    }
+    this.style = checkStyle (style);
+    this.display = display;
+}
+
+/**
+ * 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 DWTException <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 (DWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (DWT.Resize, typedListener);
+    addListener (DWT.Move, 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.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception DWTException <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 (DWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener(DWT.KeyUp,typedListener);
+    addListener(DWT.KeyDown,typedListener);
+}
+
+Point adjustMoveCursor () {
+    if (bounds is null) return null;
+    int newX = bounds.x + bounds.width / 2;
+    int newY = bounds.y;
+
+    Point point = display.map (parent, null, newX, newY);
+    display.setCursorLocation (point);
+
+    /*
+     * The call to XWarpPointer does not always place the pointer on the
+     * exact location that is specified, so do a query (below) to get the
+     * actual location of the pointer after it has been moved.
+     */
+    int actualX, actualY, state;
+    OS.gdk_window_get_pointer (cast(GdkWindow*)window, &actualX, &actualY, &state);
+    return new Point (actualX, actualY);
+}
+
+Point adjustResizeCursor () {
+    if (bounds is null) return null;
+    int newX, newY;
+
+    if ((cursorOrientation & DWT.LEFT) !is 0) {
+        newX = bounds.x;
+    } else if ((cursorOrientation & DWT.RIGHT) !is 0) {
+        newX = bounds.x + bounds.width;
+    } else {
+        newX = bounds.x + bounds.width / 2;
+    }
+
+    if ((cursorOrientation & DWT.UP) !is 0) {
+        newY = bounds.y;
+    } else if ((cursorOrientation & DWT.DOWN) !is 0) {
+        newY = bounds.y + bounds.height;
+    } else {
+        newY = bounds.y + bounds.height / 2;
+    }
+
+    Point point = display.map (parent, null, newX, newY);
+    display.setCursorLocation (point);
+
+    /*
+     * The call to XWarpPointer does not always place the pointer on the
+     * exact location that is specified, so do a query (below) to get the
+     * actual location of the pointer after it has been moved.
+     */
+    int  actualX, actualY, state;
+    OS.gdk_window_get_pointer (window, &actualX, &actualY, &state);
+    return new Point (actualX, actualY );
+}
+
+
+/**
+ * Stops displaying the tracker rectangles.  Note that this is not considered
+ * to be a cancelation by the user.
+ *
+ * @exception DWTException <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 close () {
+    checkWidget();
+    tracking = false;
+}
+
+static int checkStyle (int style) {
+    if ((style & (DWT.LEFT | DWT.RIGHT | DWT.UP | DWT.DOWN)) is 0) {
+        style |= DWT.LEFT | DWT.RIGHT | DWT.UP | DWT.DOWN;
+    }
+    return style;
+}
+
+Rectangle computeBounds () {
+    if (rectangles.length is 0) return null;
+    int xMin = rectangles [0].x;
+    int yMin = rectangles [0].y;
+    int xMax = rectangles [0].x + rectangles [0].width;
+    int yMax = rectangles [0].y + rectangles [0].height;
+
+    for (int i = 1; i < rectangles.length; i++) {
+        if (rectangles [i].x < xMin) xMin = rectangles [i].x;
+        if (rectangles [i].y < yMin) yMin = rectangles [i].y;
+        int rectRight = rectangles [i].x + rectangles [i].width;
+        if (rectRight > xMax) xMax = rectRight;
+        int rectBottom = rectangles [i].y + rectangles [i].height;
+        if (rectBottom > yMax) yMax = rectBottom;
+    }
+
+    return new Rectangle (xMin, yMin, xMax - xMin, yMax - yMin);
+}
+
+Rectangle [] computeProportions (Rectangle [] rects) {
+    Rectangle [] result = new Rectangle [rects.length];
+    bounds = computeBounds ();
+    if (bounds !is null) {
+        for (int i = 0; i < rects.length; i++) {
+            int x = 0, y = 0, width = 0, height = 0;
+            if (bounds.width !is 0) {
+                x = (rects [i].x - bounds.x) * 100 / bounds.width;
+                width = rects [i].width * 100 / bounds.width;
+            } else {
+                width = 100;
+            }
+            if (bounds.height !is 0) {
+                y = (rects [i].y - bounds.y) * 100 / bounds.height;
+                height = rects [i].height * 100 / bounds.height;
+            } else {
+                height = 100;
+            }
+            result [i] = new Rectangle (x, y, width, height);
+        }
+    }
+    return result;
+}
+
+void drawRectangles (Rectangle [] rects) {
+    auto window = OS.GDK_ROOT_PARENT ();
+    if (parent !is null) {
+        window = OS.GTK_WIDGET_WINDOW (parent.paintHandle());
+    }
+    if (window is null) return;
+    auto gc = OS.gdk_gc_new (window);
+    if (gc is null) return;
+    auto colormap = OS.gdk_colormap_get_system ();
+    GdkColor color;
+    OS.gdk_color_white (colormap, &color);
+    OS.gdk_gc_set_foreground (gc, &color);
+    OS.gdk_gc_set_subwindow (gc, OS.GDK_INCLUDE_INFERIORS);
+    OS.gdk_gc_set_function (gc, OS.GDK_XOR);
+    for (int i=0; i<rects.length; i++) {
+        Rectangle rect = rects [i];
+        OS.gdk_draw_rectangle (window, gc, 0, rect.x, rect.y, rect.width, rect.height);
+    }
+    OS.g_object_unref (gc);
+}
+
+/**
+ * Returns the bounds that are being drawn, expressed relative to the parent
+ * widget.  If the parent is a <code>Display</code> then these are screen
+ * coordinates.
+ *
+ * @return the bounds of the Rectangles being drawn
+ *
+ * @exception DWTException <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 [] getRectangles () {
+    checkWidget();
+    Rectangle [] result = new Rectangle [rectangles.length];
+    for (int i = 0; i < rectangles.length; i++) {
+        Rectangle current = rectangles [i];
+        result [i] = new Rectangle (current.x, current.y, current.width, current.height);
+    }
+    return result;
+}
+
+/**
+ * Returns <code>true</code> if the rectangles are drawn with a stippled line, <code>false</code> otherwise.
+ *
+ * @return the stippled effect of the rectangles
+ *
+ * @exception DWTException <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 getStippled () {
+    checkWidget();
+    return stippled;
+}
+
+bool grab () {
+    int result = OS.gdk_pointer_grab (window, false, OS.GDK_POINTER_MOTION_MASK | OS.GDK_BUTTON_RELEASE_MASK, window, cursor, OS.GDK_CURRENT_TIME);
+    return result is OS.GDK_GRAB_SUCCESS;
+}
+
+override int gtk_button_release_event (GtkWidget* widget, GdkEventButton* event) {
+    return gtk_mouse (OS.GDK_BUTTON_RELEASE, widget, event);
+}
+
+override int gtk_key_press_event (GtkWidget* widget, GdkEventKey* keyEvent) {
+    auto result = super.gtk_key_press_event (widget, keyEvent);
+    if (result !is 0) return result;
+    int stepSize = ((keyEvent.state & OS.GDK_CONTROL_MASK) !is 0) ? STEPSIZE_SMALL : STEPSIZE_LARGE;
+    int xChange = 0, yChange = 0;
+    switch (keyEvent.keyval) {
+        case OS.GDK_Escape:
+            cancelled = true;
+            // fallthrough
+        case OS.GDK_Return:
+            tracking = false;
+            break;
+        case OS.GDK_Left:
+            xChange = -stepSize;
+            break;
+        case OS.GDK_Right:
+            xChange = stepSize;
+            break;
+        case OS.GDK_Up:
+            yChange = -stepSize;
+            break;
+        case OS.GDK_Down:
+            yChange = stepSize;
+            break;
+        default:
+    }
+    if (xChange !is 0 || yChange !is 0) {
+        Rectangle [] oldRectangles = rectangles;
+        Rectangle [] rectsToErase = new Rectangle [rectangles.length];
+        for (int i = 0; i < rectangles.length; i++) {
+            Rectangle current = rectangles [i];
+            rectsToErase [i] = new Rectangle (current.x, current.y, current.width, current.height);
+        }
+        Event event = new Event ();
+        event.x = oldX + xChange;
+        event.y = oldY + yChange;
+        if ((style & DWT.RESIZE) !is 0) {
+            resizeRectangles (xChange, yChange);
+            sendEvent (DWT.Resize, event);
+            /*
+            * It is possible (but unlikely) that application
+            * code could have disposed the widget in the resize
+            * event.  If this happens return false to indicate
+            * that the tracking has failed.
+            */
+            if (isDisposed ()) {
+                cancelled = true;
+                return 1;
+            }
+            bool draw = false;
+            /*
+             * It is possible that application code could have
+             * changed the rectangles in the resize event.  If this
+             * happens then only redraw the tracker if the rectangle
+             * values have changed.
+             */
+            if (rectangles !is oldRectangles) {
+                int length = rectangles.length;
+                if (length !is rectsToErase.length) {
+                    draw = true;
+                } else {
+                    for (int i = 0; i < length; i++) {
+                        if (rectangles [i] !=/*eq*/ rectsToErase [i]) {
+                            draw = true;
+                            break;
+                        }
+                    }
+                }
+            } else {
+                draw = true;
+            }
+            if (draw) {
+                drawRectangles (rectsToErase);
+                update ();
+                drawRectangles (rectangles);
+            }
+            Point cursorPos = adjustResizeCursor ();
+            if (cursorPos !is null) {
+                oldX = cursorPos.x;
+                oldY = cursorPos.y;
+            }
+        } else {
+            moveRectangles (xChange, yChange);
+            sendEvent (DWT.Move, event);
+            /*
+            * It is possible (but unlikely) that application
+            * code could have disposed the widget in the move
+            * event.  If this happens return false to indicate
+            * that the tracking has failed.
+            */
+            if (isDisposed ()) {
+                cancelled = true;
+                return 1;
+            }
+            bool draw = false;
+            /*
+             * It is possible that application code could have
+             * changed the rectangles in the move event.  If this
+             * happens then only redraw the tracker if the rectangle
+             * values have changed.
+             */
+            if (rectangles !is oldRectangles) {
+                int length = rectangles.length;
+                if (length !is rectsToErase.length) {
+                    draw = true;
+                } else {
+                    for (int i = 0; i < length; i++) {
+                        if (rectangles [i] !=/*eq*/ rectsToErase [i]) {
+                            draw = true;
+                            break;
+                        }
+                    }
+                }
+            } else {
+                draw = true;
+            }
+            if (draw) {
+                drawRectangles (rectsToErase);
+                update ();
+                drawRectangles (rectangles);
+            }
+            Point cursorPos = adjustMoveCursor ();
+            if (cursorPos !is null) {
+                oldX = cursorPos.x;
+                oldY = cursorPos.y;
+            }
+        }
+    }
+    return result;
+}
+
+override int gtk_motion_notify_event (GtkWidget* widget, GdkEventMotion* eventPtr) {
+    if (cursor !is lastCursor) {
+        ungrab ();
+        grabbed = grab ();
+        lastCursor = cursor;
+    }
+    return gtk_mouse (OS.GDK_MOTION_NOTIFY, widget, eventPtr);
+}
+
+private int gtk_mouse (int eventType, GtkWidget* widget, void* eventPtr) {
+    int newX, newY;
+    OS.gdk_window_get_pointer (window, &newX, &newY, null);
+    if (oldX !is newX || oldY !is newY ) {
+        Rectangle [] oldRectangles = rectangles;
+        Rectangle [] rectsToErase = new Rectangle [rectangles.length];
+        for (int i = 0; i < rectangles.length; i++) {
+            Rectangle current = rectangles [i];
+            rectsToErase [i] = new Rectangle (current.x, current.y, current.width, current.height);
+        }
+        Event event = new Event ();
+        if (parent is null) {
+            event.x = newX ;
+            event.y = newY ;
+        } else {
+            Point screenCoord = display.map (parent, null, newX , newY );
+            event.x = screenCoord.x;
+            event.y = screenCoord.y;
+        }
+        if ((style & DWT.RESIZE) !is 0) {
+            resizeRectangles (newX  - oldX, newY  - oldY);
+            sendEvent (DWT.Resize, event);
+            /*
+            * It is possible (but unlikely), that application
+            * code could have disposed the widget in the resize
+            * event.  If this happens, return false to indicate
+            * that the tracking has failed.
+            */
+            if (isDisposed ()) {
+                cancelled = true;
+                return 1;
+            }
+            bool draw = false;
+            /*
+             * It is possible that application code could have
+             * changed the rectangles in the resize event.  If this
+             * happens then only redraw the tracker if the rectangle
+             * values have changed.
+             */
+            if (rectangles !is oldRectangles) {
+                int length = rectangles.length;
+                if (length !is rectsToErase.length) {
+                    draw = true;
+                } else {
+                    for (int i = 0; i < length; i++) {
+                        if (rectangles [i] !=/*eq*/ rectsToErase [i]) {
+                            draw = true;
+                            break;
+                        }
+                    }
+                }
+            } else {
+                draw = true;
+            }
+            if (draw) {
+                drawRectangles (rectsToErase);
+                update ();
+                drawRectangles (rectangles);
+            }
+            Point cursorPos = adjustResizeCursor ();
+            if (cursorPos !is null) {
+                newX  = cursorPos.x;
+                newY  = cursorPos.y;
+            }
+        } else {
+            moveRectangles (newX  - oldX, newY  - oldY);
+            sendEvent (DWT.Move, event);
+            /*
+            * It is possible (but unlikely), that application
+            * code could have disposed the widget in the move
+            * event.  If this happens, return false to indicate
+            * that the tracking has failed.
+            */
+            if (isDisposed ()) {
+                cancelled = true;
+                return 1;
+            }
+            bool draw = false;
+            /*
+             * It is possible that application code could have
+             * changed the rectangles in the move event.  If this
+             * happens then only redraw the tracker if the rectangle
+             * values have changed.
+             */
+            if (rectangles !is oldRectangles) {
+                int length = rectangles.length;
+                if (length !is rectsToErase.length) {
+                    draw = true;
+                } else {
+                    for (int i = 0; i < length; i++) {
+                        if (rectangles [i] !=/*eq*/ rectsToErase [i]) {
+                            draw = true;
+                            break;
+                        }
+                    }
+                }
+            } else {
+                draw = true;
+            }
+            if (draw) {
+                drawRectangles (rectsToErase);
+                update ();
+                drawRectangles (rectangles);
+            }
+        }
+        oldX = newX ;
+        oldY = newY ;
+    }
+    tracking = eventType !is OS.GDK_BUTTON_RELEASE;
+    return 0;
+}
+
+void moveRectangles (int xChange, int yChange) {
+    if (bounds is null) return;
+    if (xChange < 0 && ((style & DWT.LEFT) is 0)) xChange = 0;
+    if (xChange > 0 && ((style & DWT.RIGHT) is 0)) xChange = 0;
+    if (yChange < 0 && ((style & DWT.UP) is 0)) yChange = 0;
+    if (yChange > 0 && ((style & DWT.DOWN) is 0)) yChange = 0;
+    if (xChange is 0 && yChange is 0) return;
+    bounds.x += xChange; bounds.y += yChange;
+    for (int i = 0; i < rectangles.length; i++) {
+        rectangles [i].x += xChange;
+        rectangles [i].y += yChange;
+    }
+}
+
+/**
+ * Displays the Tracker rectangles for manipulation by the user.  Returns when
+ * the user has either finished manipulating the rectangles or has cancelled the
+ * Tracker.
+ *
+ * @return <code>true</code> if the user did not cancel the Tracker, <code>false</code> otherwise
+ *
+ * @exception DWTException <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 open () {
+    checkWidget();
+    window = OS.GDK_ROOT_PARENT ();
+    if (parent !is null) {
+        window = OS.GTK_WIDGET_WINDOW (parent.paintHandle());
+    }
+    if (window is null) return false;
+    cancelled = false;
+    tracking = true;
+    update ();
+    drawRectangles (rectangles);
+    int oldX, oldY, state;
+    OS.gdk_window_get_pointer (window, &oldX, &oldY, &state);
+
+    /*
+    * if exactly one of UP/DOWN is specified as a style then set the cursor
+    * orientation accordingly (the same is done for LEFT/RIGHT styles below)
+    */
+    int vStyle = style & (DWT.UP | DWT.DOWN);
+    if (vStyle is DWT.UP || vStyle is DWT.DOWN) {
+        cursorOrientation |= vStyle;
+    }
+    int hStyle = style & (DWT.LEFT | DWT.RIGHT);
+    if (hStyle is DWT.LEFT || hStyle is DWT.RIGHT) {
+        cursorOrientation |= hStyle;
+    }
+
+    int mask = OS.GDK_BUTTON1_MASK | OS.GDK_BUTTON2_MASK | OS.GDK_BUTTON3_MASK;
+    bool mouseDown = (state  & mask) !is 0;
+    if (!mouseDown) {
+        Point cursorPos = null;
+        if ((style & DWT.RESIZE) !is 0) {
+            cursorPos = adjustResizeCursor ();
+        } else {
+            cursorPos = adjustMoveCursor ();
+        }
+        if (cursorPos !is null) {
+            oldX  = cursorPos.x;
+            oldY  = cursorPos.y;
+        }
+    }
+    this.oldX = oldX ;
+    this.oldY = oldY ;
+
+    grabbed = grab ();
+    lastCursor = cursor;
+
+    /* Tracker behaves like a Dialog with its own OS event loop. */
+    GdkEvent* gdkEvent;
+    while (tracking) {
+        if (parent !is null && parent.isDisposed ()) break;
+        GdkEvent* eventPtr;
+        while (true) {
+            eventPtr = OS.gdk_event_get ();
+            if (eventPtr !is null) {
+                break;
+            } else {
+                try { Thread.sleep(0.050); } catch (TracedException ex) {}
+            }
+        }
+        gdkEvent = eventPtr;
+        auto widget = OS.gtk_get_event_widget (eventPtr);
+        switch (gdkEvent.type) {
+            case OS.GDK_MOTION_NOTIFY: gtk_motion_notify_event (widget, cast(GdkEventMotion*)eventPtr); break;
+            case OS.GDK_BUTTON_RELEASE: gtk_button_release_event (widget, cast(GdkEventButton*)eventPtr); break;
+            case OS.GDK_KEY_PRESS: gtk_key_press_event (widget, cast(GdkEventKey*)eventPtr); break;
+            case OS.GDK_KEY_RELEASE: gtk_key_release_event (widget, cast(GdkEventKey*)eventPtr); break;
+            case OS.GDK_BUTTON_PRESS:
+            case OS.GDK_2BUTTON_PRESS:
+            case OS.GDK_3BUTTON_PRESS:
+            case OS.GDK_ENTER_NOTIFY:
+            case OS.GDK_LEAVE_NOTIFY:
+                /* Do not dispatch these */
+                break;
+            case OS.GDK_EXPOSE:
+                update ();
+                drawRectangles (rectangles);
+                OS.gtk_main_do_event (eventPtr);
+                drawRectangles (rectangles);
+                break;
+            default:
+                OS.gtk_main_do_event (eventPtr);
+        }
+        OS.gdk_event_free (eventPtr);
+    }
+    if (!isDisposed ()) {
+        update ();
+        drawRectangles (rectangles);
+    }
+    ungrab ();
+    window = null;
+    return !cancelled;
+}
+
+void releaseWidget () {
+    super.releaseWidget ();
+    parent = null;
+    rectangles = proportions = null;
+    bounds = null;
+}
+
+/**
+ * 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 DWTException <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 (DWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (DWT.Resize, listener);
+    eventTable.unhook (DWT.Move, 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 DWTException <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 (DWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (DWT.KeyUp, listener);
+    eventTable.unhook (DWT.KeyDown, listener);
+}
+
+void resizeRectangles (int xChange, int yChange) {
+    if (bounds is null) return;
+    /*
+    * If the cursor orientation has not been set in the orientation of
+    * this change then try to set it here.
+    */
+    if (xChange < 0 && ((style & DWT.LEFT) !is 0) && ((cursorOrientation & DWT.RIGHT) is 0)) {
+        cursorOrientation |= DWT.LEFT;
+    }
+    if (xChange > 0 && ((style & DWT.RIGHT) !is 0) && ((cursorOrientation & DWT.LEFT) is 0)) {
+        cursorOrientation |= DWT.RIGHT;
+    }
+    if (yChange < 0 && ((style & DWT.UP) !is 0) && ((cursorOrientation & DWT.DOWN) is 0)) {
+        cursorOrientation |= DWT.UP;
+    }
+    if (yChange > 0 && ((style & DWT.DOWN) !is 0) && ((cursorOrientation & DWT.UP) is 0)) {
+        cursorOrientation |= DWT.DOWN;
+    }
+
+    /*
+     * If the bounds will flip about the x or y axis then apply the adjustment
+     * up to the axis (ie.- where bounds width/height becomes 0), change the
+     * cursor's orientation accordingly, and flip each Rectangle's origin (only
+     * necessary for > 1 Rectangles)
+     */
+    if ((cursorOrientation & DWT.LEFT) !is 0) {
+        if (xChange > bounds.width) {
+            if ((style & DWT.RIGHT) is 0) return;
+            cursorOrientation |= DWT.RIGHT;
+            cursorOrientation &= ~DWT.LEFT;
+            bounds.x += bounds.width;
+            xChange -= bounds.width;
+            bounds.width = 0;
+            if (proportions.length > 1) {
+                for (int i = 0; i < proportions.length; i++) {
+                    Rectangle proportion = proportions [i];
+                    proportion.x = 100 - proportion.x - proportion.width;
+                }
+            }
+        }
+    } else if ((cursorOrientation & DWT.RIGHT) !is 0) {
+        if (bounds.width < -xChange) {
+            if ((style & DWT.LEFT) is 0) return;
+            cursorOrientation |= DWT.LEFT;
+            cursorOrientation &= ~DWT.RIGHT;
+            xChange += bounds.width;
+            bounds.width = 0;
+            if (proportions.length > 1) {
+                for (int i = 0; i < proportions.length; i++) {
+                    Rectangle proportion = proportions [i];
+                    proportion.x = 100 - proportion.x - proportion.width;
+                }
+            }
+        }
+    }
+    if ((cursorOrientation & DWT.UP) !is 0) {
+        if (yChange > bounds.height) {
+            if ((style & DWT.DOWN) is 0) return;
+            cursorOrientation |= DWT.DOWN;
+            cursorOrientation &= ~DWT.UP;
+            bounds.y += bounds.height;
+            yChange -= bounds.height;
+            bounds.height = 0;
+            if (proportions.length > 1) {
+                for (int i = 0; i < proportions.length; i++) {
+                    Rectangle proportion = proportions [i];
+                    proportion.y = 100 - proportion.y - proportion.height;
+                }
+            }
+        }
+    } else if ((cursorOrientation & DWT.DOWN) !is 0) {
+        if (bounds.height < -yChange) {
+            if ((style & DWT.UP) is 0) return;
+            cursorOrientation |= DWT.UP;
+            cursorOrientation &= ~DWT.DOWN;
+            yChange += bounds.height;
+            bounds.height = 0;
+            if (proportions.length > 1) {
+                for (int i = 0; i < proportions.length; i++) {
+                    Rectangle proportion = proportions [i];
+                    proportion.y = 100 - proportion.y - proportion.height;
+                }
+            }
+        }
+    }
+
+    // apply the bounds adjustment
+    if ((cursorOrientation & DWT.LEFT) !is 0) {
+        bounds.x += xChange;
+        bounds.width -= xChange;
+    } else if ((cursorOrientation & DWT.RIGHT) !is 0) {
+        bounds.width += xChange;
+    }
+    if ((cursorOrientation & DWT.UP) !is 0) {
+        bounds.y += yChange;
+        bounds.height -= yChange;
+    } else if ((cursorOrientation & DWT.DOWN) !is 0) {
+        bounds.height += yChange;
+    }
+
+    Rectangle [] newRects = new Rectangle [rectangles.length];
+    for (int i = 0; i < rectangles.length; i++) {
+        Rectangle proportion = proportions[i];
+        newRects[i] = new Rectangle (
+            proportion.x * bounds.width / 100 + bounds.x,
+            proportion.y * bounds.height / 100 + bounds.y,
+            proportion.width * bounds.width / 100,
+            proportion.height * bounds.height / 100);
+    }
+    rectangles = newRects;
+}
+
+/**
+ * Sets the <code>Cursor</code> of the Tracker.  If this cursor is <code>null</code>
+ * then the cursor reverts to the default.
+ *
+ * @param newCursor the new <code>Cursor</code> to display
+ *
+ * @exception DWTException <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 value) {
+    checkWidget ();
+    cursor = null;
+    if (value !is null) cursor = value.handle;
+}
+
+/**
+ * Specifies the rectangles that should be drawn, expressed relative to the parent
+ * widget.  If the parent is a Display then these are screen coordinates.
+ *
+ * @param rectangles the bounds of the rectangles to be drawn
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the set of rectangles is null or contains a null rectangle</li>
+ * </ul>
+ * @exception DWTException <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 setRectangles (Rectangle [] rectangles) {
+    checkWidget();
+    if (rectangles is null) error (DWT.ERROR_NULL_ARGUMENT);
+    int length = rectangles.length;
+    this.rectangles = new Rectangle [length];
+    for (int i = 0; i < length; i++) {
+        Rectangle current = rectangles [i];
+        if (current is null) error (DWT.ERROR_NULL_ARGUMENT);
+        this.rectangles [i] = new Rectangle (current.x, current.y, current.width, current.height);
+    }
+    proportions = computeProportions (rectangles);
+}
+
+/**
+ * Changes the appearance of the line used to draw the rectangles.
+ *
+ * @param stippled <code>true</code> if rectangle should appear stippled
+ *
+ * @exception DWTException <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 setStippled (bool stippled) {
+    checkWidget();
+    this.stippled = stippled;
+}
+
+void ungrab () {
+    if (grabbed) OS.gdk_pointer_ungrab (OS.GDK_CURRENT_TIME);
+}
+
+void update () {
+    if (parent !is null) {
+        if (parent.isDisposed ()) return;
+        parent.getShell ().update ();
+    } else {
+        display.update ();
+    }
+}
+
+}