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annotate dwt/dnd/TableDragSourceEffect.d @ 194:3afcd4ddcf90

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Update to SWT 3.3.2
author Frank Benoit <benoit@tionex.de>
date Wed, 19 Mar 2008 21:48:31 +0100
parents c605bf6c2f48
children 36f5cb12e1a2
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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.TableDragSourceEffect;
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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.Table;
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21 import dwt.widgets.TableItem;
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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 import dwt.dwthelper.utils;
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27
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28 /**
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29 * This class provides default implementations to display a source image
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30 * when a drag is initiated from a <code>Table</code>.
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31 *
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32 * <p>Classes that wish to provide their own source image for a <code>Table</code> can
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33 * extend the <code>TableDragSourceEffect</code> class, override the
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34 * <code>TableDragSourceEffect.dragStart</code> method and set the field
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35 * <code>DragSourceEvent.image</code> with their own image.</p>
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36 *
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37 * Subclasses that override any methods of this class must call the corresponding
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38 * <code>super</code> method to get the default drag source effect implementation.
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39 *
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40 * @see DragSourceEffect
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41 * @see DragSourceEvent
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42 *
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43 * @since 3.3
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44 */
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45 public class TableDragSourceEffect : DragSourceEffect {
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46 Image dragSourceImage = null;
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47
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48 /**
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49 * Creates a new <code>TableDragSourceEffect</code> to handle drag effect
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50 * from the specified <code>Table</code>.
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51 *
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52 * @param table the <code>Table</code> that the user clicks on to initiate the drag
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53 */
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54 public this(Table table) {
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55 super(table);
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56 }
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57
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58 /**
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59 * This implementation of <code>dragFinished</code> disposes the image
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60 * that was created in <code>TableDragSourceEffect.dragStart</code>.
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61 *
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62 * Subclasses that override this method should call <code>super.dragFinished(event)</code>
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63 * to dispose the image in the default implementation.
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64 *
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65 * @param event the information associated with the drag finished event
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66 */
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67 public void dragFinished(DragSourceEvent event) {
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68 if (dragSourceImage !is null) dragSourceImage.dispose();
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69 dragSourceImage = null;
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70 }
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71
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72 /**
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73 * This implementation of <code>dragStart</code> will create a default
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74 * image that will be used during the drag. The image should be disposed
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75 * when the drag is completed in the <code>TableDragSourceEffect.dragFinished</code>
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76 * method.
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77 *
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78 * Subclasses that override this method should call <code>super.dragStart(event)</code>
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79 * to use the image from the default implementation.
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80 *
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81 * @param event the information associated with the drag start event
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82 */
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83 public void dragStart(DragSourceEvent event) {
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84 event.image = getDragSourceImage(event);
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85 }
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86
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87 Image getDragSourceImage(DragSourceEvent event) {
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88 if (dragSourceImage !is null) dragSourceImage.dispose();
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89 dragSourceImage = null;
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90 Table table = cast(Table) control;
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91 TableItem[] selection = table.getSelection();
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92 if (selection.length is 0) return null;
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93 int tableImageList = OS.SendMessage (table.handle, OS.LVM_GETIMAGELIST, OS.LVSIL_SMALL, 0);
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94 if (tableImageList !is 0) {
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95 int count = Math.min(selection.length, 10);
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96 Rectangle bounds = selection[0].getBounds(0);
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97 for (int i = 1; i < count; i++) {
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98 bounds = bounds.makeUnion(selection[i].getBounds(0));
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99 }
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100 auto hDC = OS.GetDC(null);
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101 auto hDC1 = OS.CreateCompatibleDC(hDC);
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102 if (!OS.IsWinCE && OS.WIN32_VERSION >= OS.VERSION(4, 10)) {
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103 if ((table.getStyle() & DWT.RIGHT_TO_LEFT) !is 0) {
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104 OS.SetLayout(hDC1, OS.LAYOUT_RTL | OS.LAYOUT_BITMAPORIENTATIONPRESERVED);
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105 }
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106 }
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107 auto bitmap = OS.CreateCompatibleBitmap(hDC, bounds.width, bounds.height);
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108 auto hOldBitmap = OS.SelectObject(hDC1, bitmap);
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109 RECT rect;
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110 rect.right = bounds.width;
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111 rect.bottom = bounds.height;
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112 auto hBrush = OS.GetStockObject(OS.WHITE_BRUSH);
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113 OS.FillRect(hDC1, &rect, hBrush);
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114 for (int i = 0; i < count; i++) {
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115 TableItem selected = selection[i];
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116 Rectangle cell = selected.getBounds(0);
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117 POINT pt;
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118 HANDLE imageList = cast(HANDLE) OS.SendMessage (table.handle, OS.LVM_CREATEDRAGIMAGE, table.indexOf(selected), &pt);
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119 OS.ImageList_Draw(imageList, 0, hDC1, cell.x - bounds.x, cell.y - bounds.y, OS.ILD_SELECTED);
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120 OS.ImageList_Destroy(imageList);
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121 }
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122 OS.SelectObject(hDC1, hOldBitmap);
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123 OS.DeleteDC (hDC1);
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124 OS.ReleaseDC (null, hDC);
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125 Display display = table.getDisplay();
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126 dragSourceImage = Image.win32_new(display, DWT.BITMAP, bitmap);
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127 return dragSourceImage;
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128 }
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129 return null;
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130 }
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131 }