--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.draw2d/src/org/eclipse/draw2d/ToolTipHelper.d	Sat Mar 14 18:23:29 2009 +0100
@@ -0,0 +1,174 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2005 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.draw2d.ToolTipHelper;
+
+import java.lang.all;
+import org.eclipse.swt.dwthelper.Runnable;
+import org.eclipse.dwtxhelper.Timer;
+import org.eclipse.dwtxhelper.TimerTask;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.events.MouseTrackAdapter;
+import org.eclipse.swt.graphics.Point;
+import org.eclipse.swt.widgets.Display;
+static import org.eclipse.swt.widgets.Control;
+static import org.eclipse.swt.graphics.Rectangle;
+static import org.eclipse.swt.events.MouseEvent;
+
+import org.eclipse.draw2d.geometry.Dimension;
+import org.eclipse.draw2d.IFigure;
+import org.eclipse.draw2d.PopUpHelper;
+import org.eclipse.draw2d.ColorConstants;
+
+/**
+ * This class is used by SWTEventDispatcher as support to display Figure tooltips on a
+ * mouse hover event. Tooltips are drawn directly below the cursor unless the display
+ * does not allow, in which case the tooltip will be drawn directly above the cursor.
+ * Tooltips will be displayed with a LineBorder. The background of the tooltips will be
+ * the standard SWT tooltipBackground color unless the Figure's tooltip has set its own
+ * background.
+ */
+public class ToolTipHelper
+    : PopUpHelper
+{
+
+private Timer timer;
+private IFigure currentTipSource;
+
+/**
+ * Constructs a ToolTipHelper to be associated with Control <i>c</i>.
+ *
+ * @param c the control
+ * @since 2.0
+ */
+public this(org.eclipse.swt.widgets.Control.Control c) {
+    super(c, SWT.TOOL | SWT.ON_TOP);
+    getShell().setBackground(ColorConstants.tooltipBackground);
+    getShell().setForeground(ColorConstants.tooltipForeground);
+}
+
+/*
+ * Calculates the location where the tooltip will be painted. Returns this as a Point.
+ * Tooltip will be painted directly below the cursor if possible, otherwise it will be
+ * painted directly above cursor.
+ */
+private Point computeWindowLocation(IFigure tip, int eventX, int eventY) {
+    org.eclipse.swt.graphics.Rectangle.Rectangle clientArea = control.getDisplay().getClientArea();
+    Point preferredLocation = new Point(eventX, eventY + 26);
+
+    Dimension tipSize = getLightweightSystem()
+        .getRootFigure()
+        .getPreferredSize()
+        .getExpanded(getShellTrimSize());
+
+    // Adjust location if tip is going to fall outside display
+    if (preferredLocation.y + tipSize.height > clientArea.height)
+        preferredLocation.y = eventY - tipSize.height;
+
+    if (preferredLocation.x + tipSize.width > clientArea.width)
+        preferredLocation.x -= (preferredLocation.x + tipSize.width) - clientArea.width;
+
+    return preferredLocation;
+}
+
+/**
+ * Sets the LightWeightSystem's contents to the passed tooltip, and displays the tip. The
+ * tip will be displayed only if the tip source is different than the previously viewed
+ * tip source. (i.e. The cursor has moved off of the previous tooltip source figure.)
+ * <p>
+ * The tooltip will be painted directly below the cursor if possible, otherwise it will be
+ * painted directly above cursor.
+ *
+ * @param hoverSource the figure over which the hover event was fired
+ * @param tip the tooltip to be displayed
+ * @param eventX the x coordinate of the hover event
+ * @param eventY the y coordinate of the hover event
+ * @since 2.0
+ */
+public void displayToolTipNear(IFigure hoverSource, IFigure tip, int eventX, int eventY) {
+    if (tip !is null && hoverSource !is currentTipSource) {
+        getLightweightSystem().setContents(tip);
+        Point displayPoint = computeWindowLocation(tip, eventX, eventY);
+        Dimension shellSize = getLightweightSystem().getRootFigure()
+            .getPreferredSize().getExpanded(getShellTrimSize());
+        setShellBounds(displayPoint.x, displayPoint.y, shellSize.width, shellSize.height);
+        show();
+        currentTipSource = hoverSource;
+        timer = new Timer(true);
+        timer.schedule(new class() TimerTask {
+            public void run() {
+                Display.getDefault().syncExec(dgRunnable( {
+                    hide();
+                    timer.cancel();
+                }));
+            }
+        }, 5000);
+    }
+}
+
+/**
+ * Disposes of the tooltip's shell and kills the timer.
+ *
+ * @see PopUpHelper#dispose()
+ */
+public void dispose() {
+    if (isShowing()) {
+        timer.cancel();
+        hide();
+    }
+    getShell().dispose();
+}
+
+/**
+ * @see PopUpHelper#hookShellListeners()
+ */
+protected void hookShellListeners() {
+    // Close the tooltip window if the mouse enters the tooltip
+    getShell().addMouseTrackListener(new class() MouseTrackAdapter {
+        public void mouseEnter(org.eclipse.swt.events.MouseEvent.MouseEvent e) {
+            hide();
+            currentTipSource = null;
+            timer.cancel();
+        }
+    });
+}
+
+/**
+ * Displays the hover source's tooltip if a tooltip of another source is currently being
+ * displayed.
+ *
+ * @param figureUnderMouse the figure over which the cursor was when called
+ * @param tip the tooltip to be displayed
+ * @param eventX the x coordinate of the cursor
+ * @param eventY the y coordinate of the cursor
+ * @since 2.0
+ */
+public void updateToolTip(IFigure figureUnderMouse, IFigure tip, int eventX, int eventY) {
+    /* If the cursor is not on any Figures, it has been moved
+       off of the control. Hide the tool tip. */
+    if (figureUnderMouse is null) {
+        if (isShowing()) {
+            hide();
+            timer.cancel();
+        }
+    }
+    // Makes tooltip appear without a hover event if a tip is currently being displayed
+    if (isShowing() && figureUnderMouse !is currentTipSource) {
+        hide();
+        timer.cancel();
+        displayToolTipNear(figureUnderMouse, tip, eventX, eventY);
+    } else if (!isShowing() && figureUnderMouse !is currentTipSource)
+        currentTipSource = null;
+}
+
+}