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comparison dwtx/jface/resource/DerivedImageDescriptor.d @ 4:c87617952847

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some JFace modules
author Frank Benoit <benoit@tionex.de>
date Fri, 28 Mar 2008 17:08:33 +0100
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children ea8ff534f622
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3:6518c18a01f7 4:c87617952847
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 dwtx.jface.resource.DerivedImageDescriptor;
14
15 import dwtx.jface.resource.ImageDescriptor;
16 import dwtx.jface.resource.DeviceResourceException;
17
18 import dwt.DWT;
19 import dwt.DWTException;
20 import dwt.graphics.Device;
21 import dwt.graphics.Image;
22 import dwt.graphics.ImageData;
23 import dwt.widgets.Display;
24
25 import dwt.dwthelper.utils;
26
27 /**
28 * An image descriptor which creates images based on another ImageDescriptor, but with
29 * additional DWT flags. Note that this is only intended for compatibility.
30 *
31 * @since 3.1
32 */
33 final class DerivedImageDescriptor : ImageDescriptor {
34
35 private ImageDescriptor original;
36 private int flags;
37
38 /**
39 * Create a new image descriptor
40 * @param original the original one
41 * @param swtFlags flags to be used when image is created {@link Image#Image(Device, Image, int)}
42 * @see DWT#IMAGE_COPY
43 * @see DWT#IMAGE_DISABLE
44 * @see DWT#IMAGE_GRAY
45 */
46 public this(ImageDescriptor original, int swtFlags) {
47 this.original = original;
48 flags = swtFlags;
49 }
50
51 public Object createResource(Device device) {
52 try {
53 return internalCreateImage(device);
54 } catch (DWTException e) {
55 throw new DeviceResourceException(this, e);
56 }
57 }
58
59 public Image createImage(Device device) {
60 return internalCreateImage(device);
61 }
62
63 public override hash_t toHash() {
64 return original.toHash() + flags;
65 }
66
67 public override int opEquals(Object arg0) {
68 if ( auto desc = cast(DerivedImageDescriptor)arg0 ) {
69 return desc.original is original && flags is desc.flags;
70 }
71
72 return false;
73 }
74
75 /**
76 * Creates a new Image on the given device. Note that we defined a new
77 * method rather than overloading createImage since this needs to be
78 * called by getImageData(), and we want to be absolutely certain not
79 * to cause infinite recursion if the base class gets refactored.
80 *
81 * @param device device to create the image on
82 * @return a newly allocated Image. Must be disposed by calling image.dispose().
83 */
84 private final Image internalCreateImage(Device device) {
85 Image originalImage = original.createImage(device);
86 Image result = new Image(device, originalImage, flags);
87 original.destroyResource(originalImage);
88 return result;
89 }
90
91 public ImageData getImageData() {
92 Image image = internalCreateImage(Display.getCurrent());
93 ImageData result = image.getImageData();
94 image.dispose();
95 return result;
96 }
97
98 }