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comparison org.eclipse.jface/src/org/eclipse/jface/resource/ImageDataImageDescriptor.d @ 12:bc29606a740c

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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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11:43904fec5dca 12:bc29606a740c
1 /*******************************************************************************
2 * Copyright (c) 2004, 2007 IBM Corporation and others.
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
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module org.eclipse.jface.resource.ImageDataImageDescriptor;
14
15 import org.eclipse.swt.graphics.Device;
16 import org.eclipse.swt.graphics.Image;
17 import org.eclipse.swt.graphics.ImageData;
18
19 import org.eclipse.jface.resource.ImageDescriptor;
20
21 import java.lang.all;
22
23 /**
24 * @since 3.1
25 */
26 class ImageDataImageDescriptor : ImageDescriptor {
27
28 private ImageData data;
29
30 /**
31 * Original image being described, or null if this image is described
32 * completely using its ImageData
33 */
34 private Image originalImage = null;
35
36 /**
37 * Creates an image descriptor, given an image and the device it was created on.
38 *
39 * @param originalImage
40 */
41 this(Image originalImage) {
42 this(originalImage.getImageData());
43 this.originalImage = originalImage;
44 }
45
46 /**
47 * Creates an image descriptor, given some image data.
48 *
49 * @param data describing the image
50 */
51
52 this(ImageData data) {
53 this.data = data;
54 }
55
56 /* (non-Javadoc)
57 * @see org.eclipse.jface.resource.DeviceResourceDescriptor#create(org.eclipse.swt.graphics.Device)
58 */
59 public override Object createResource(Device device) {
60
61 // If this descriptor is an existing font, then we can return the original font
62 // if this is the same device.
63 if (originalImage !is null) {
64 // If we're allocating on the same device as the original font, return the original.
65 if (originalImage.getDevice() is device) {
66 return originalImage;
67 }
68 }
69
70 return super.createResource(device);
71 }
72
73 /* (non-Javadoc)
74 * @see org.eclipse.jface.resource.DeviceResourceDescriptor#destroy(java.lang.Object)
75 */
76 public override void destroyResource(Object previouslyCreatedObject) {
77 if (previouslyCreatedObject is originalImage) {
78 return;
79 }
80
81 super.destroyResource(previouslyCreatedObject);
82 }
83
84 /* (non-Javadoc)
85 * @see org.eclipse.jface.resource.ImageDescriptor#getImageData()
86 */
87 public override ImageData getImageData() {
88 return data;
89 }
90
91 /* (non-Javadoc)
92 * @see Object#hashCode
93 */
94 public override hash_t toHash() {
95 if (originalImage !is null) {
96 return System.identityHashCode(originalImage);
97 }
98 return data.toHash();
99 }
100
101 /* (non-Javadoc)
102 * @see Object#equals
103 */
104 public override int opEquals(Object obj) {
105 if (!(cast(ImageDataImageDescriptor)obj )) {
106 return false;
107 }
108
109 ImageDataImageDescriptor imgWrap = cast(ImageDataImageDescriptor) obj;
110
111 //Intentionally using is instead of equals() as Image.hashCode() changes
112 //when the image is disposed and so leaks may occur with equals()
113
114 if (originalImage !is null) {
115 return imgWrap.originalImage is originalImage;
116 }
117
118 return (imgWrap.originalImage is null && data.opEquals(imgWrap.data));
119 }
120
121 }