Mercurial > projects > dwt-linux
annotate dwt/dnd/TreeDragSourceEffect.d @ 259:c0d810de7093
Update SWT 3.4M7 to 3.4
| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Sun, 29 Jun 2008 14:33:38 +0200 |
| parents | ce446666f5a2 |
| children |
| rev | line source |
|---|---|
|
150
f2e04420fd6c
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Frank Benoit <benoit@tionex.de>
parents:
108
diff
changeset
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1 /******************************************************************************* |
| 259 | 2 * Copyright (c) 2000, 2008 IBM Corporation and others. |
| 92 | 3 * All rights reserved. This program and the accompanying materials |
| 4 * are made available under the terms of the Eclipse Public License v1.0 | |
| 5 * which accompanies this distribution, and is available at | |
| 6 * http://www.eclipse.org/legal/epl-v10.html | |
| 7 * | |
| 8 * Contributors: | |
| 9 * IBM Corporation - initial API and implementation | |
| 108 | 10 * Port to the D programming language: |
| 11 * Frank Benoit <benoit@tionex.de> | |
| 92 | 12 *******************************************************************************/ |
| 13 module dwt.dnd.TreeDragSourceEffect; | |
| 14 | |
| 15 | |
| 16 import dwt.DWT; | |
| 17 import dwt.graphics.Image; | |
| 18 import dwt.internal.gtk.OS; | |
| 19 import dwt.widgets.Display; | |
| 20 import dwt.widgets.Tree; | |
| 21 import dwt.dnd.DragSourceEffect; | |
| 22 import dwt.dnd.DragSourceEvent; | |
| 23 | |
| 24 import Math = tango.math.Math; | |
| 25 | |
| 26 /** | |
| 27 * This class provides default implementations to display a source image | |
| 28 * when a drag is initiated from a <code>Tree</code>. | |
| 29 * | |
| 30 * <p>Classes that wish to provide their own source image for a <code>Tree</code> can | |
| 31 * extend <code>TreeDragSourceEffect</code> class and override the <code>TreeDragSourceEffect.dragStart</code> | |
| 32 * method and set the field <code>DragSourceEvent.image</code> with their own image.</p> | |
| 33 * | |
| 34 * Subclasses that override any methods of this class must call the corresponding | |
| 35 * <code>super</code> method to get the default drag under effect implementation. | |
| 36 * | |
| 37 * @see DragSourceEffect | |
| 38 * @see DragSourceEvent | |
| 259 | 39 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
| 92 | 40 * |
| 41 * @since 3.3 | |
| 42 */ | |
| 43 public class TreeDragSourceEffect : DragSourceEffect { | |
| 44 Image dragSourceImage = null; | |
| 45 | |
| 46 /** | |
| 47 * Creates a new <code>TreeDragSourceEffect</code> to handle drag effect | |
| 48 * from the specified <code>Tree</code>. | |
| 49 * | |
| 50 * @param tree the <code>Tree</code> that the user clicks on to initiate the drag | |
| 51 */ | |
| 52 public this(Tree tree) { | |
| 53 super(tree); | |
| 54 } | |
| 55 | |
| 56 /** | |
| 57 * This implementation of <code>dragFinished</code> disposes the image | |
| 58 * that was created in <code>TreeDragSourceEffect.dragStart</code>. | |
| 59 * | |
| 60 * Subclasses that override this method should call <code>super.dragFinished(event)</code> | |
| 61 * to dispose the image in the default implementation. | |
| 62 * | |
| 63 * @param event the information associated with the drag finished event | |
| 64 */ | |
|
150
f2e04420fd6c
reworked overrides and superclass aliases
Frank Benoit <benoit@tionex.de>
parents:
108
diff
changeset
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65 public override void dragFinished(DragSourceEvent event) { |
| 92 | 66 if (dragSourceImage !is null) dragSourceImage.dispose(); |
| 67 dragSourceImage = null; | |
| 68 } | |
| 69 | |
| 70 /** | |
| 71 * This implementation of <code>dragStart</code> will create a default | |
| 72 * image that will be used during the drag. The image should be disposed | |
| 73 * when the drag is completed in the <code>TreeDragSourceEffect.dragFinished</code> | |
| 74 * method. | |
| 75 * | |
| 76 * Subclasses that override this method should call <code>super.dragStart(event)</code> | |
| 77 * to use the image from the default implementation. | |
| 78 * | |
| 79 * @param event the information associated with the drag start event | |
| 80 */ | |
|
150
f2e04420fd6c
reworked overrides and superclass aliases
Frank Benoit <benoit@tionex.de>
parents:
108
diff
changeset
|
81 public override void dragStart(DragSourceEvent event) { |
| 92 | 82 event.image = getDragSourceImage(event); |
| 83 } | |
| 84 | |
| 85 Image getDragSourceImage(DragSourceEvent event) { | |
| 86 if (dragSourceImage !is null) dragSourceImage.dispose(); | |
| 87 dragSourceImage = null; | |
| 88 | |
| 89 Tree tree = cast(Tree) control; | |
| 90 if (OS.GTK_VERSION < OS.buildVERSION (2, 2, 0)) return null; | |
| 240 | 91 //TEMPORARY CODE |
| 92 if (tree.isListening(DWT.EraseItem) || tree.isListening (DWT.PaintItem)) return null; | |
| 92 | 93 /* |
| 94 * Bug in GTK. gtk_tree_selection_get_selected_rows() segmentation faults | |
| 95 * in versions smaller than 2.2.4 if the model is NULL. The fix is | |
| 96 * to give a valid pointer instead. | |
| 97 */ | |
| 98 auto handle = tree.handle; | |
| 99 auto selection = OS.gtk_tree_view_get_selection (handle); | |
| 100 int dummy; | |
| 101 void* model = OS.GTK_VERSION < OS.buildVERSION (2, 2, 4) ? &dummy : null; | |
| 102 auto list = OS.gtk_tree_selection_get_selected_rows (selection, &model); | |
| 103 if (list is null) return null; | |
| 104 int count = Math.min(10, OS.g_list_length (list)); | |
| 105 | |
| 106 Display display = tree.getDisplay(); | |
| 107 if (count is 1) { | |
| 108 auto path = OS.g_list_nth_data (list, 0); | |
| 109 auto pixmap = OS.gtk_tree_view_create_row_drag_icon(handle, path); | |
| 110 dragSourceImage = Image.gtk_new(display, DWT.ICON, pixmap, null); | |
| 111 } else { | |
| 112 int width = 0, height = 0; | |
| 113 int w , h; | |
| 114 int[] yy = new int[count], hh = new int[count]; | |
| 115 GdkDrawable* [] pixmaps = new GdkDrawable*[count]; | |
| 116 GdkRectangle rect; | |
| 117 for (int i=0; i<count; i++) { | |
| 118 auto path = OS.g_list_nth_data (list, i); | |
| 119 OS.gtk_tree_view_get_cell_area (handle, path, null, &rect); | |
| 120 pixmaps[i] = OS.gtk_tree_view_create_row_drag_icon(handle, path); | |
| 121 OS.gdk_drawable_get_size(pixmaps[i], &w, &h); | |
| 122 width = Math.max(width, w); | |
| 123 height = rect.y + h - yy[0]; | |
| 124 yy[i] = rect.y; | |
| 125 hh[i] = h; | |
| 126 } | |
| 127 auto source = OS.gdk_pixmap_new(OS.GDK_ROOT_PARENT(), width, height, -1); | |
| 128 auto gcSource = OS.gdk_gc_new(source); | |
| 129 auto mask = OS.gdk_pixmap_new(OS.GDK_ROOT_PARENT(), width, height, 1); | |
| 130 auto gcMask = OS.gdk_gc_new(mask); | |
| 131 GdkColor color; | |
| 132 color.pixel = 0; | |
| 133 OS.gdk_gc_set_foreground(gcMask, &color); | |
| 134 OS.gdk_draw_rectangle(mask, gcMask, 1, 0, 0, width, height); | |
| 135 color.pixel = 1; | |
| 136 OS.gdk_gc_set_foreground(gcMask, &color); | |
| 137 for (int i=0; i<count; i++) { | |
| 138 OS.gdk_draw_drawable(source, gcSource, pixmaps[i], 0, 0, 0, yy[i] - yy[0], -1, -1); | |
| 139 OS.gdk_draw_rectangle(mask, gcMask, 1, 0, yy[i] - yy[0], width, hh[i]); | |
| 140 OS.g_object_unref(pixmaps[i]); | |
| 141 } | |
| 142 OS.g_object_unref(gcSource); | |
| 143 OS.g_object_unref(gcMask); | |
| 144 dragSourceImage = Image.gtk_new(display, DWT.ICON, source, mask); | |
| 145 } | |
| 146 OS.g_list_free (list); | |
| 147 | |
| 148 return dragSourceImage; | |
| 149 } | |
| 150 } |