1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
/*******************************************************************************
* Copyright (c) 2000, 2008 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
*******************************************************************************/
package org.eclipse.swt.dnd;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.widgets.*;
/**
* 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
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*
* @since 3.3
*/
public class TreeDragSourceEffect extends 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 TreeDragSourceEffect(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 != 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 != null) dragSourceImage.dispose();
dragSourceImage = null;
Tree tree = (Tree) control;
if (OS.GTK_VERSION < OS.VERSION (2, 2, 0)) return null;
//TEMPORARY CODE
if (tree.isListening(SWT.EraseItem) || tree.isListening (SWT.PaintItem)) return null;
/*
* Bug in GTK. gtk_tree_selection_get_selected_rows() segmentation faults
* in versions smaller than 2.2.4 if the model is NULL. The fix is
* to give a valid pointer instead.
*/
int /*long*/ handle = tree.handle;
int /*long*/ selection = OS.gtk_tree_view_get_selection (handle);
int /*long*/ [] model = OS.GTK_VERSION < OS.VERSION (2, 2, 4) ? new int /*long*/ [1] : null;
int /*long*/ list = OS.gtk_tree_selection_get_selected_rows (selection, model);
if (list == 0) return null;
int count = Math.min(10, OS.g_list_length (list));
Display display = tree.getDisplay();
if (count == 1) {
int /*long*/ path = OS.g_list_nth_data (list, 0);
int /*long*/ pixmap = OS.gtk_tree_view_create_row_drag_icon(handle, path);
dragSourceImage = Image.gtk_new(display, SWT.ICON, pixmap, 0);
OS.gtk_tree_path_free (path);
} else {
int width = 0, height = 0;
int[] w = new int[1], h = new int[1];
int[] yy = new int[count], hh = new int[count];
int /*long*/ [] pixmaps = new int /*long*/ [count];
GdkRectangle rect = new GdkRectangle ();
for (int i=0; i<count; i++) {
int /*long*/ path = OS.g_list_nth_data (list, i);
OS.gtk_tree_view_get_cell_area (handle, path, 0, rect);
pixmaps[i] = OS.gtk_tree_view_create_row_drag_icon(handle, path);
OS.gdk_drawable_get_size(pixmaps[i], w, h);
width = Math.max(width, w[0]);
height = rect.y + h[0] - yy[0];
yy[i] = rect.y;
hh[i] = h[0];
OS.gtk_tree_path_free (path);
}
int /*long*/ source = OS.gdk_pixmap_new(OS.gdk_get_default_root_window(), width, height, -1);
int /*long*/ gcSource = OS.gdk_gc_new(source);
int /*long*/ mask = OS.gdk_pixmap_new(OS.gdk_get_default_root_window(), width, height, 1);
int /*long*/ gcMask = OS.gdk_gc_new(mask);
GdkColor color = new GdkColor();
color.pixel = 0;
OS.gdk_gc_set_foreground(gcMask, color);
OS.gdk_draw_rectangle(mask, gcMask, 1, 0, 0, width, height);
color.pixel = 1;
OS.gdk_gc_set_foreground(gcMask, color);
for (int i=0; i<count; i++) {
OS.gdk_draw_drawable(source, gcSource, pixmaps[i], 0, 0, 0, yy[i] - yy[0], -1, -1);
OS.gdk_draw_rectangle(mask, gcMask, 1, 0, yy[i] - yy[0], width, hh[i]);
OS.g_object_unref(pixmaps[i]);
}
OS.g_object_unref(gcSource);
OS.g_object_unref(gcMask);
dragSourceImage = Image.gtk_new(display, SWT.ICON, source, mask);
}
OS.g_list_free (list);
return dragSourceImage;
}
}
|
