--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/dnd/TreeDragSourceEffect.d	Wed Feb 13 04:51:22 2008 +0100
@@ -0,0 +1,119 @@
+/*******************************************************************************
+ * Copyright (c) 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
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwt.dnd.TreeDragSourceEffect;
+
+import dwt.DWT;
+import dwt.graphics.Image;
+import dwt.graphics.Rectangle;
+import dwt.internal.win32.OS;
+import dwt.widgets.Display;
+import dwt.widgets.Tree;
+import dwt.widgets.TreeItem;
+
+/**
+ * This class provides default implementations to display a source image
+ * when a drag is initiated from a <code>Tree</code>.
+ *
+ * <p>Classes that wish to provide their own source image for a <code>Tree</code> can
+ * extend <code>TreeDragSourceEffect</code> class and override the <code>TreeDragSourceEffect.dragStart</code>
+ * method and set the field <code>DragSourceEvent.image</code> with their own image.</p>
+ *
+ * Subclasses that override any methods of this class must call the corresponding
+ * <code>super</code> method to get the default drag under effect implementation.
+ *
+ * @see DragSourceEffect
+ * @see DragSourceEvent
+ *
+ * @since 3.3
+ */
+public class TreeDragSourceEffect : DragSourceEffect {
+    Image dragSourceImage = null;
+
+    /**
+     * Creates a new <code>TreeDragSourceEffect</code> to handle drag effect
+     * from the specified <code>Tree</code>.
+     *
+     * @param tree the <code>Tree</code> that the user clicks on to initiate the drag
+     */
+    public this(Tree tree) {
+        super(tree);
+    }
+
+    /**
+     * This implementation of <code>dragFinished</code> disposes the image
+     * that was created in <code>TreeDragSourceEffect.dragStart</code>.
+     *
+     * Subclasses that override this method should call <code>super.dragFinished(event)</code>
+     * to dispose the image in the default implementation.
+     *
+     * @param event the information associated with the drag finished event
+     */
+    public void dragFinished(DragSourceEvent event) {
+        if (dragSourceImage !is null) dragSourceImage.dispose();
+        dragSourceImage = null;
+    }
+
+    /**
+     * This implementation of <code>dragStart</code> will create a default
+     * image that will be used during the drag. The image should be disposed
+     * when the drag is completed in the <code>TreeDragSourceEffect.dragFinished</code>
+     * method.
+     *
+     * Subclasses that override this method should call <code>super.dragStart(event)</code>
+     * to use the image from the default implementation.
+     *
+     * @param event the information associated with the drag start event
+     */
+    public void dragStart(DragSourceEvent event) {
+        event.image = getDragSourceImage(event);
+    }
+
+    Image getDragSourceImage(DragSourceEvent event) {
+        if (dragSourceImage !is null) dragSourceImage.dispose();
+        dragSourceImage = null;
+        Tree tree = (Tree) control;
+        TreeItem[] selection = tree.getSelection();
+        if (selection.length is 0) return null;
+        int treeImageList = OS.SendMessage (tree.handle, OS.TVM_GETIMAGELIST, OS.TVSIL_NORMAL, 0);
+        if (treeImageList !is 0) {
+            int count = Math.min(selection.length, 10);
+            Rectangle bounds = selection[0].getBounds(0);
+            for (int i = 1; i < count; i++) {
+                bounds = bounds.union(selection[i].getBounds(0));
+            }
+            int hDC = OS.GetDC(0);
+            int hDC1 = OS.CreateCompatibleDC(hDC);
+            int bitmap = OS.CreateCompatibleBitmap(hDC, bounds.width, bounds.height);
+            int hOldBitmap = OS.SelectObject(hDC1, bitmap);
+            RECT rect = new RECT();
+            rect.right = bounds.width;
+            rect.bottom = bounds.height;
+            int hBrush = OS.GetStockObject(OS.WHITE_BRUSH);
+            OS.FillRect(hDC1, rect, hBrush);
+            for (int i = 0; i < count; i++) {
+                TreeItem selected = selection[i];
+                Rectangle cell = selected.getBounds(0);
+                int imageList = OS.SendMessage(tree.handle, OS.TVM_CREATEDRAGIMAGE, 0, selected.handle);
+                OS.ImageList_Draw(imageList, 0, hDC1, cell.x - bounds.x, cell.y - bounds.y, OS.ILD_SELECTED);
+                OS.ImageList_Destroy(imageList);
+            }
+            OS.SelectObject(hDC1, hOldBitmap);
+            OS.DeleteDC (hDC1);
+            OS.ReleaseDC (0, hDC);
+            Display display = tree.getDisplay();
+            dragSourceImage = Image.win32_new(display, DWT.BITMAP, bitmap);
+            return dragSourceImage;
+        }
+        return null;
+    }
+}