--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/widgets/ToolTip.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,637 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2007 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.ToolTip;
+
+import dwt.dwthelper.utils;
+
+
+import dwt.DWT;
+import dwt.DWTException;
+import dwt.events.SelectionEvent;
+import dwt.events.SelectionListener;
+import dwt.graphics.Color;
+import dwt.graphics.Font;
+import dwt.graphics.FontData;
+import dwt.graphics.GC;
+import dwt.graphics.Image;
+import dwt.graphics.Point;
+import dwt.graphics.Rectangle;
+import dwt.graphics.Region;
+import dwt.graphics.TextLayout;
+import dwt.graphics.TextStyle;
+
+/**
+ * Instances of this class represent popup windows that are used
+ * to inform or warn the user.
+ * <p>
+ * <dl>
+ * <dt><b>Styles:</b></dt>
+ * <dd>BALLOON, ICON_ERROR, ICON_INFORMATION, ICON_WARNING</dd>
+ * <dt><b>Events:</b></dt>
+ * <dd>Selection</dd>
+ * </dl>
+ * </p><p>
+ * Note: Only one of the styles ICON_ERROR, ICON_INFORMATION,
+ * and ICON_WARNING may be specified.
+ * </p><p>
+ * IMPORTANT: This class is intended to be subclassed <em>only</em>
+ * within the DWT implementation.
+ * </p>
+ * 
+ * @since 3.2
+ */
+public class ToolTip extends Widget {
+    Shell parent, tip;
+    TrayItem item;
+    int x, y;
+    int [] borderPolygon;
+    bool spikeAbove, autohide;
+    Listener listener;
+    TextLayout layoutText, layoutMessage;
+    Region region;
+    Font boldFont;
+    Runnable runnable;
+    
+    static final int BORDER = 5;
+    static final int PADDING = 5;
+    static final int INSET = 4;
+    static final int TIP_HEIGHT = 20;
+    static final int IMAGE_SIZE = 16;
+    static final int DELAY = 10000;
+
+/**
+ * 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 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 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#ICON_ERROR
+ * @see DWT#ICON_INFORMATION
+ * @see DWT#ICON_WARNING
+ * @see Widget#checkSubclass
+ * @see Widget#getStyle
+ */
+public ToolTip (Shell parent, int style) {
+    super (parent, checkStyle (style));
+    this.parent = parent;
+    this.autohide = true;
+    x = y = -1; 
+    Display display = getDisplay ();
+    tip = new Shell (parent, DWT.ON_TOP | DWT.NO_TRIM);
+    Color background = display.getSystemColor (DWT.COLOR_INFO_BACKGROUND);
+    tip.setBackground (background);
+    listener = new Listener () {
+        public void handleEvent (Event event) {
+            switch (event.type) {
+                case DWT.Dispose: onDispose (event); break;
+                case DWT.Paint: onPaint (event); break;
+                case DWT.MouseDown: onMouseDown (event); break;
+            }
+        }
+    };
+    addListener (DWT.Dispose, listener);
+    tip.addListener (DWT.Paint, listener);
+    tip.addListener (DWT.MouseDown, listener);
+}
+
+static int checkStyle (int style) {
+    int mask = DWT.ICON_ERROR | DWT.ICON_INFORMATION | DWT.ICON_WARNING;
+    if ((style & mask) is 0) return style;
+    return checkBits (style, DWT.ICON_INFORMATION, DWT.ICON_WARNING, DWT.ICON_ERROR, 0, 0, 0);
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when the receiver is selected by the user, by sending
+ * it one of the messages defined in the <code>SelectionListener</code>
+ * interface.
+ * <p>
+ * <code>widgetSelected</code> is called when the receiver is selected.
+ * <code>widgetDefaultSelected</code> is not called.
+ * </p>
+ *
+ * @param listener the listener which should be notified when the receiver is selected by the user
+ *
+ * @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 SelectionListener
+ * @see #removeSelectionListener
+ * @see SelectionEvent
+ */
+public void addSelectionListener (SelectionListener listener) {
+    checkWidget ();
+    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (DWT.Selection,typedListener);
+    addListener (DWT.DefaultSelection,typedListener);
+}
+
+void configure () {
+    Display display = parent.getDisplay ();
+    int x = this.x;
+    int y = this.y;
+    if (x is -1 || y is -1) {
+        Point point = display.getCursorLocation ();
+        x = point.x;
+        y = point.y;
+    }
+    Monitor monitor = parent.getMonitor ();
+    Rectangle dest = monitor.getBounds ();
+    Point size = getSize (dest.width / 4);
+    int w = size.x;
+    int h = size.y;
+    int t = (style & DWT.BALLOON) !is 0 ? TIP_HEIGHT : 0;
+    int i = (style & DWT.BALLOON) !is 0 ? 16 : 0;
+    tip.setSize (w, h + t);
+    int [] polyline;
+    spikeAbove = dest.height >= y + size.y + t;
+    if (dest.width >= x + size.x) {
+        if (dest.height >= y + size.y + t) {
+            polyline = new int [] {
+                0, 5+t, 1, 5+t, 1, 3+t, 3, 1+t, 5, 1+t, 5, t, 
+                16, t, 16, 0, 35, t,
+                w-5, t, w-5, 1+t, w-3, 1+t, w-1, 3+t, w-1, 5+t, w, 5+t,
+                w, h-5+t, w-1, h-5+t, w-1, h-3+t, w-2, h-3+t, w-2, h-2+t, w-3, h-2+t, w-3, h-1+t, w-5, h-1+t, w-5, h+t,
+                5, h+t, 5, h-1+t, 3, h-1+t, 3, h-2+t, 2, h-2+t, 2, h-3+t, 1, h-3+t, 1, h-5+t, 0, h-5+t, 
+                0, 5+t};
+            borderPolygon = new int[] {
+                    0, 5+t, 1, 4+t, 1, 3+t, 3, 1+t,  4, 1+t, 5, t, 
+                    16, t, 16, 1, 35, t,
+                    w-6, 0+t, w-5, 1+t, w-4, 1+t, w-2, 3+t, w-2, 4+t, w-1, 5+t,
+                    w-1, h-6+t, w-2, h-5+t, w-2, h-4+t, w-4, h-2+t, w-5, h-2+t, w-6, h-1+t,
+                    5, h-1+t, 4, h-2+t, 3, h-2+t, 1, h-4+t, 1, h-5+t, 0, h-6+t, 
+                    0, 5+t};
+            tip.setLocation (Math.max (0, x - i), y);
+        } else {
+            polyline = new int [] {
+                0, 5, 1, 5, 1, 3, 3, 1, 5, 1, 5, 0, 
+                w-5, 0, w-5, 1, w-3, 1, w-1, 3, w-1, 5, w, 5,
+                w, h-5, w-1, h-5, w-1, h-3, w-2, h-3, w-2, h-2, w-3, h-2, w-3, h-1, w-5, h-1, w-5, h,
+                35, h, 16, h+t, 16, h,
+                5, h, 5, h-1, 3, h-1, 3, h-2, 2, h-2, 2, h-3, 1, h-3, 1, h-5, 0, h-5, 
+                0, 5};
+            borderPolygon = new int[] {
+                    0, 5, 1, 4, 1, 3, 3, 1,  4, 1, 5, 0, 
+                    w-6, 0, w-5, 1, w-4, 1, w-2, 3, w-2, 4, w-1, 5,
+                    w-1, h-6, w-2, h-5, w-2, h-4, w-4, h-2, w-5, h-2, w-6, h-1,
+                    36, h-1, 16, h+t-1, 16, h-1,
+                    5, h-1, 4, h-2, 3, h-2, 1, h-4, 1, h-5, 0, h-6, 
+                    0, 5};
+            tip.setLocation (Math.max (0, x - i), y - size.y - t);
+        }
+    } else {
+        if (dest.height >= y + size.y + t) {
+            polyline = new int [] {
+                0, 5+t, 1, 5+t, 1, 3+t, 3, 1+t, 5, 1+t, 5, t, 
+                w-35, t, w-16, 0, w-16, t,
+                w-5, t, w-5, 1+t, w-3, 1+t, w-1, 3+t, w-1, 5+t, w, 5+t,
+                w, h-5+t, w-1, h-5+t, w-1, h-3+t, w-2, h-3+t, w-2, h-2+t, w-3, h-2+t, w-3, h-1+t, w-5, h-1+t, w-5, h+t,
+                5, h+t, 5, h-1+t, 3, h-1+t, 3, h-2+t, 2, h-2+t, 2, h-3+t, 1, h-3+t, 1, h-5+t, 0, h-5+t, 
+                0, 5+t};
+            borderPolygon = new int[] {
+                    0, 5+t, 1, 4+t, 1, 3+t, 3, 1+t,  4, 1+t, 5, t, 
+                    w-35, t, w-17, 2, w-17, t,
+                    w-6, t, w-5, 1+t, w-4, 1+t, w-2, 3+t, w-2, 4+t, w-1, 5+t,
+                    w-1, h-6+t, w-2, h-5+t, w-2, h-4+t, w-4, h-2+t, w-5, h-2+t, w-6, h-1+t,
+                    5, h-1+t, 4, h-2+t, 3, h-2+t, 1, h-4+t, 1, h-5+t, 0, h-6+t, 
+                    0, 5+t};
+            tip.setLocation (Math.min (dest.width - size.x, x - size.x + i), y);
+        } else {
+            polyline = new int [] {
+                0, 5, 1, 5, 1, 3, 3, 1, 5, 1, 5, 0, 
+                w-5, 0, w-5, 1, w-3, 1, w-1, 3, w-1, 5, w, 5,
+                w, h-5, w-1, h-5, w-1, h-3, w-2, h-3, w-2, h-2, w-3, h-2, w-3, h-1, w-5, h-1, w-5, h,
+                w-16, h, w-16, h+t, w-35, h,
+                5, h, 5, h-1, 3, h-1, 3, h-2, 2, h-2, 2, h-3, 1, h-3, 1, h-5, 0, h-5, 
+                0, 5};
+            borderPolygon = new int[] {
+                    0, 5, 1, 4, 1, 3, 3, 1,  4, 1, 5, 0, 
+                    w-6, 0, w-5, 1, w-4, 1, w-2, 3, w-2, 4, w-1, 5,
+                    w-1, h-6, w-2, h-5, w-2, h-4, w-4, h-2, w-5, h-2, w-6, h-1,
+                    w-17, h-1, w-17, h+t-2, w-36, h-1,
+                    5, h-1, 4, h-2, 3, h-2, 1, h-4, 1, h-5, 0, h-6, 
+                    0, 5};
+            tip.setLocation (Math.min (dest.width - size.x, x - size.x + i), y - size.y - t);
+        }
+    }   
+    if ((style & DWT.BALLOON) !is 0) {
+        if (region !is null) region.dispose ();
+        region = new Region (display);
+        region.add (polyline);
+        tip.setRegion (region);
+    }
+}
+
+/**
+ * Returns <code>true</code> if the receiver is automatically
+ * hidden by the platform, and <code>false</code> otherwise.
+ *
+ * @return the receiver's auto hide state
+ *
+ * @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 getAutoHide () {
+    checkWidget ();
+    return autohide;
+}
+
+Point getSize (int maxWidth) {
+    int textWidth = 0, messageWidth = 0;
+    if (layoutText !is null) {
+        layoutText.setWidth (-1);
+        textWidth = layoutText.getBounds ().width;
+    }
+    if (layoutMessage !is null) {
+        layoutMessage.setWidth (-1);
+        messageWidth = layoutMessage.getBounds ().width;
+    }
+    int messageTrim = 2 * INSET + 2 * BORDER + 2 * PADDING;
+    bool hasImage =  layoutText !is null && (style & DWT.BALLOON) !is 0 && (style & (DWT.ICON_ERROR | DWT.ICON_INFORMATION | DWT.ICON_WARNING)) !is 0;
+    int textTrim = messageTrim + (hasImage ? IMAGE_SIZE : 0);
+    int width = Math.min (maxWidth, Math.max (textWidth + textTrim, messageWidth + messageTrim));
+    int textHeight = 0, messageHeight = 0;
+    if (layoutText !is null) {
+        layoutText.setWidth (maxWidth - textTrim);  
+        textHeight = layoutText.getBounds ().height;
+    }
+    if (layoutMessage !is null) {
+        layoutMessage.setWidth (maxWidth - messageTrim);
+        messageHeight = layoutMessage.getBounds ().height;
+    }
+    int height = 2 * BORDER + 2 * PADDING + messageHeight;
+    if (layoutText !is null) height += Math.max (IMAGE_SIZE, textHeight) + 2 * PADDING;
+    return new Point (width, height);
+}
+
+/**
+ * Returns the receiver's message, which will be an empty
+ * string if it has never been set.
+ *
+ * @return the receiver's message
+ *
+ * @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 String getMessage () {
+    checkWidget ();
+    return layoutMessage !is null ? layoutMessage.getText() : "";
+}
+
+/**
+ * Returns the receiver's parent, which must be a <code>Shell</code>.
+ *
+ * @return the receiver's parent
+ *
+ * @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 Shell getParent () {
+    checkWidget ();
+    return parent;
+}
+
+/**
+ * Returns the receiver's text, which will be an empty
+ * string if it has never been set.
+ *
+ * @return the receiver's text
+ *
+ * @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 String getText () {
+    checkWidget ();
+    return layoutText !is null ? layoutText.getText() : "";
+}
+
+/**
+ * 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 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 getVisible () {
+    checkWidget ();
+    return tip.getVisible ();
+}
+
+/**
+ * Returns <code>true</code> if the receiver is visible and all
+ * of the receiver's ancestors are visible and <code>false</code>
+ * otherwise.
+ *
+ * @return the receiver's visibility state
+ *
+ * @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 #getVisible
+ */
+public bool isVisible () {
+    checkWidget ();
+    return getVisible ();
+}
+
+void onDispose (Event event) {
+    removeListener (DWT.Dispose, listener);
+    notifyListeners (DWT.Dispose, event);
+    event.type = DWT.None;
+
+    if (runnable !is null) {
+        Display display = getDisplay ();
+        display.timerExec (-1, runnable);
+    }
+    runnable = null;
+    tip.dispose ();
+    tip = null;
+    if (region !is null) region.dispose ();
+    region = null;
+    if (layoutText !is null) layoutText.dispose ();
+    layoutText = null;
+    if (layoutMessage !is null) layoutMessage.dispose ();
+    layoutMessage = null;
+    if (boldFont !is null) boldFont.dispose ();
+    boldFont = null;
+    borderPolygon = null;
+}
+
+void onMouseDown (Event event) {
+    notifyListeners (DWT.Selection, new Event ());
+    setVisible (false);
+}
+
+void onPaint (Event event) {
+    GC gc = event.gc;
+    int x = BORDER + PADDING;
+    int y = BORDER + PADDING;
+    if ((style & DWT.BALLOON) !is 0) {
+        if (spikeAbove) y += TIP_HEIGHT;
+        gc.drawPolygon (borderPolygon);
+    } else {
+        Rectangle rect = tip.getClientArea ();
+        gc.drawRectangle(rect.x, rect.y, rect.width - 1, rect.height -1);
+    } 
+    if (layoutText !is null) {
+        int id = style & (DWT.ICON_ERROR | DWT.ICON_INFORMATION | DWT.ICON_WARNING);
+        if ((style & DWT.BALLOON) !is 0 && id !is 0) {
+            Display display = getDisplay ();
+            Image image = display.getSystemImage (id);
+            Rectangle rect = image.getBounds ();
+            gc.drawImage (image, 0, 0, rect.width, rect.height, x, y, IMAGE_SIZE, IMAGE_SIZE);
+            x += IMAGE_SIZE;
+        }
+        x += INSET;
+        layoutText.draw (gc, x, y);
+        y += 2 * PADDING + Math.max (IMAGE_SIZE, layoutText.getBounds ().height);
+    }
+    if (layoutMessage !is null) {
+        x = BORDER + PADDING + INSET;
+        layoutMessage.draw (gc, x, y);
+    }
+}
+
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when the receiver is selected by the user.
+ *
+ * @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 SelectionListener
+ * @see #addSelectionListener
+ */
+public void removeSelectionListener (SelectionListener listener) {
+    checkWidget();
+    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (DWT.Selection, listener);
+    eventTable.unhook (DWT.DefaultSelection,listener);  
+}
+
+/**
+ * Makes the receiver hide automatically when <code>true</code>,
+ * and remain visible when <code>false</code>.
+ *
+ * @param autoHide the auto hide state
+ *
+ * @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 #getVisible
+ * @see #setVisible
+ */
+public void setAutoHide (bool autohide) {
+    checkWidget ();
+    this.autohide = autohide;
+    //TODO - update when visible
+}
+
+/**
+ * Sets the location of the receiver, which must be a tooltip,
+ * to the point specified by the arguments which are relative
+ * to the display.
+ * <p>
+ * Note that this is different from most widgets where the
+ * location of the widget is relative to the parent.
+ * </p>
+ *
+ * @param x the new x coordinate for the receiver
+ * @param y the new y coordinate for the receiver
+ *
+ * @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 setLocation (int x, int y) {
+    checkWidget ();
+    if (this.x is x && this.y is y) return;
+    this.x = x;
+    this.y = y;
+    if (tip.getVisible ()) configure ();
+}
+
+/**
+ * Sets the location of the receiver, which must be a tooltip,
+ * to the point specified by the argument which is relative
+ * to the display.
+ * <p>
+ * Note that this is different from most widgets where the
+ * location of the widget is relative to the parent.
+ * </p><p>
+ * Note that the platform window manager ultimately has control
+ * over the location of tooltips.
+ * </p>
+ *
+ * @param location the new location for the receiver
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the point 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>
+ */
+public void setLocation (Point location) {
+    checkWidget ();
+    if (location is null) DWT.error (DWT.ERROR_NULL_ARGUMENT);
+    setLocation (location.x, location.y);
+}
+
+/**
+ * Sets the receiver's message.
+ *
+ * @param string the new message
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the text 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>
+ */
+public void setMessage (String string) {
+    checkWidget ();
+    if (string is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (layoutMessage !is null) layoutMessage.dispose();
+    layoutMessage = null;
+    if (string.length () !is 0) {
+        Display display = getDisplay (); 
+        layoutMessage = new TextLayout (display);
+        layoutMessage.setText (string);
+    }
+    if (tip.getVisible ()) configure ();
+}
+
+/**
+ * Sets the receiver's text.
+ *
+ * @param string the new text
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the text 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>
+ */
+public void setText (String string) {
+    checkWidget ();
+    if (string is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (layoutText !is null) layoutText.dispose ();
+    layoutText = null;
+    if (boldFont !is null) boldFont.dispose ();
+    boldFont = null;
+    if (string.length () !is 0) {
+        Display display = getDisplay ();
+        layoutText = new TextLayout (display);
+        layoutText.setText (string);
+        Font font = display.getSystemFont ();
+        FontData data = font.getFontData () [0];
+        boldFont = new Font (display, data.getName (), data.getHeight (), DWT.BOLD);
+        TextStyle style = new TextStyle (boldFont, null, null);
+        layoutText.setStyle (style, 0, string.length ());
+    }
+    if (tip.getVisible ()) configure ();
+}
+
+/**
+ * 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 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 setVisible (bool visible) {
+    if (visible) configure ();
+    tip.setVisible (visible);
+    Display display = getDisplay ();
+    if (runnable !is null) display.timerExec (-1, runnable);
+    runnable = null;
+    if (autohide && visible) {
+        runnable = new Runnable () {
+            public void run () {
+                if (!isDisposed ()) setVisible (false);
+            }
+        };
+        display.timerExec(DELAY, runnable);
+    }
+}
+
+}