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comparison org.eclipse.jface/src/org/eclipse/jface/resource/DerivedImageDescriptor.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) 2005, 2006 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.DerivedImageDescriptor;
14
15 import org.eclipse.jface.resource.ImageDescriptor;
16 import org.eclipse.jface.resource.DeviceResourceException;
17
18 import org.eclipse.swt.SWT;
19 import org.eclipse.swt.SWTException;
20 import org.eclipse.swt.graphics.Device;
21 import org.eclipse.swt.graphics.Image;
22 import org.eclipse.swt.graphics.ImageData;
23 import org.eclipse.swt.widgets.Display;
24
25 import java.lang.all;
26
27 /**
28 * An image descriptor which creates images based on another ImageDescriptor, but with
29 * additional SWT flags. Note that this is only intended for compatibility.
30 *
31 * @since 3.1
32 */
33 final class DerivedImageDescriptor : ImageDescriptor {
34 alias ImageDescriptor.createImage createImage;
35
36 private ImageDescriptor original;
37 private int flags;
38
39 /**
40 * Create a new image descriptor
41 * @param original the original one
42 * @param swtFlags flags to be used when image is created {@link Image#Image(Device, Image, int)}
43 * @see SWT#IMAGE_COPY
44 * @see SWT#IMAGE_DISABLE
45 * @see SWT#IMAGE_GRAY
46 */
47 public this(ImageDescriptor original, int swtFlags) {
48 this.original = original;
49 flags = swtFlags;
50 }
51
52 public override Object createResource(Device device) {
53 try {
54 return internalCreateImage(device);
55 } catch (SWTException e) {
56 throw new DeviceResourceException(this, e);
57 }
58 }
59
60 public override Image createImage(Device device) {
61 return internalCreateImage(device);
62 }
63
64 public override hash_t toHash() {
65 return original.toHash() + flags;
66 }
67
68 public override int opEquals(Object arg0) {
69 if ( auto desc = cast(DerivedImageDescriptor)arg0 ) {
70 return desc.original is original && flags is desc.flags;
71 }
72
73 return false;
74 }
75
76 /**
77 * Creates a new Image on the given device. Note that we defined a new
78 * method rather than overloading createImage since this needs to be
79 * called by getImageData(), and we want to be absolutely certain not
80 * to cause infinite recursion if the base class gets refactored.
81 *
82 * @param device device to create the image on
83 * @return a newly allocated Image. Must be disposed by calling image.dispose().
84 */
85 private final Image internalCreateImage(Device device) {
86 Image originalImage = original.createImage(device);
87 Image result = new Image(device, originalImage, flags);
88 original.destroyResource(originalImage);
89 return result;
90 }
91
92 public override ImageData getImageData() {
93 Image image = internalCreateImage(Display.getCurrent());
94 ImageData result = image.getImageData();
95 image.dispose();
96 return result;
97 }
98
99 }