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annotate dwt/dnd/TreeDragSourceEffect.d @ 136:04e357b8343d

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DragSource
author Frank Benoit <benoit@tionex.de>
date Wed, 13 Feb 2008 14:24:54 +0100
parents 242e33c0e383
children 45172b7a0ee6
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1 /*******************************************************************************
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2 * Copyright (c) 2007 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwt.dnd.TreeDragSourceEffect;
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14
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15 import dwt.DWT;
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16 import dwt.graphics.Image;
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17 import dwt.graphics.Rectangle;
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18 import dwt.internal.win32.OS;
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19 import dwt.widgets.Display;
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20 import dwt.widgets.Tree;
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21 import dwt.widgets.TreeItem;
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22
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23 import dwt.dnd.DragSourceEffect;
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24 import dwt.dnd.DragSourceEvent;
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25
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26 /**
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27 * This class provides default implementations to display a source image
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28 * when a drag is initiated from a <code>Tree</code>.
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29 *
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30 * <p>Classes that wish to provide their own source image for a <code>Tree</code> can
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31 * extend <code>TreeDragSourceEffect</code> class and override the <code>TreeDragSourceEffect.dragStart</code>
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32 * method and set the field <code>DragSourceEvent.image</code> with their own image.</p>
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33 *
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34 * Subclasses that override any methods of this class must call the corresponding
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35 * <code>super</code> method to get the default drag under effect implementation.
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36 *
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37 * @see DragSourceEffect
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38 * @see DragSourceEvent
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39 *
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40 * @since 3.3
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41 */
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42 public class TreeDragSourceEffect : DragSourceEffect {
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43 Image dragSourceImage = null;
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44
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45 /**
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46 * Creates a new <code>TreeDragSourceEffect</code> to handle drag effect
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47 * from the specified <code>Tree</code>.
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48 *
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49 * @param tree the <code>Tree</code> that the user clicks on to initiate the drag
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50 */
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51 public this(Tree tree) {
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52 super(tree);
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53 }
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54
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55 /**
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56 * This implementation of <code>dragFinished</code> disposes the image
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57 * that was created in <code>TreeDragSourceEffect.dragStart</code>.
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58 *
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59 * Subclasses that override this method should call <code>super.dragFinished(event)</code>
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60 * to dispose the image in the default implementation.
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61 *
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62 * @param event the information associated with the drag finished event
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63 */
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64 public void dragFinished(DragSourceEvent event) {
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65 if (dragSourceImage !is null) dragSourceImage.dispose();
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66 dragSourceImage = null;
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67 }
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68
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69 /**
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70 * This implementation of <code>dragStart</code> will create a default
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71 * image that will be used during the drag. The image should be disposed
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72 * when the drag is completed in the <code>TreeDragSourceEffect.dragFinished</code>
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73 * method.
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74 *
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75 * Subclasses that override this method should call <code>super.dragStart(event)</code>
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76 * to use the image from the default implementation.
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77 *
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78 * @param event the information associated with the drag start event
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79 */
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80 public void dragStart(DragSourceEvent event) {
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81 event.image = getDragSourceImage(event);
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82 }
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83
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84 Image getDragSourceImage(DragSourceEvent event) {
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85 if (dragSourceImage !is null) dragSourceImage.dispose();
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86 dragSourceImage = null;
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87 Tree tree = cast(Tree) control;
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88 TreeItem[] selection = tree.getSelection();
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89 if (selection.length is 0) return null;
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90 int treeImageList = OS.SendMessage (tree.handle, OS.TVM_GETIMAGELIST, OS.TVSIL_NORMAL, 0);
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91 if (treeImageList !is 0) {
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92 int count = Math.min(selection.length, 10);
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93 Rectangle bounds = selection[0].getBounds(0);
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94 for (int i = 1; i < count; i++) {
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95 bounds = bounds.union_(selection[i].getBounds(0));
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96 }
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97 int hDC = OS.GetDC(0);
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98 int hDC1 = OS.CreateCompatibleDC(hDC);
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99 int bitmap = OS.CreateCompatibleBitmap(hDC, bounds.width, bounds.height);
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100 int hOldBitmap = OS.SelectObject(hDC1, bitmap);
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101 RECT rect;
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102 rect.right = bounds.width;
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103 rect.bottom = bounds.height;
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104 int hBrush = OS.GetStockObject(OS.WHITE_BRUSH);
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105 OS.FillRect(hDC1, &rect, hBrush);
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106 for (int i = 0; i < count; i++) {
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107 TreeItem selected = selection[i];
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108 Rectangle cell = selected.getBounds(0);
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109 int imageList = OS.SendMessage(tree.handle, OS.TVM_CREATEDRAGIMAGE, 0, selected.handle);
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110 OS.ImageList_Draw(imageList, 0, hDC1, cell.x - bounds.x, cell.y - bounds.y, OS.ILD_SELECTED);
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111 OS.ImageList_Destroy(imageList);
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112 }
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113 OS.SelectObject(hDC1, hOldBitmap);
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114 OS.DeleteDC (hDC1);
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115 OS.ReleaseDC (0, hDC);
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116 Display display = tree.getDisplay();
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117 dragSourceImage = Image.win32_new(display, DWT.BITMAP, bitmap);
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118 return dragSourceImage;
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119 }
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120 return null;
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121 }
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122 }