Mercurial > projects > dwt-linux
annotate dwt/graphics/Resource.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 |
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| 72 | 1 /******************************************************************************* |
| 259 | 2 * Copyright (c) 2000, 2008 IBM Corporation and others. |
| 4 | 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 | |
| 72 | 10 * Port to the D programming language: |
| 11 * Frank Benoit <benoit@tionex.de> | |
| 4 | 12 *******************************************************************************/ |
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13 module dwt.graphics.Resource; |
| 4 | 14 |
| 71 | 15 import dwt.DWT; |
| 4 | 16 |
| 18 | 17 import dwt.graphics.Device; |
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18 import dwt.internal.c.gdk; |
| 4 | 19 |
| 20 /** | |
| 21 * This class is the abstract superclass of all graphics resource objects. | |
| 22 * Resources created by the application must be disposed. | |
| 23 * <p> | |
| 24 * IMPORTANT: This class is intended to be subclassed <em>only</em> | |
| 71 | 25 * within the DWT implementation. However, it has not been marked |
| 26 * final to allow those outside of the DWT development team to implement | |
| 4 | 27 * patched versions of the class in order to get around specific |
| 28 * limitations in advance of when those limitations can be addressed | |
| 29 * by the team. Any class built using subclassing to access the internals | |
| 30 * of this class will likely fail to compile or run between releases and | |
| 31 * may be strongly platform specific. Subclassing should not be attempted | |
| 32 * without an intimate and detailed understanding of the workings of the | |
| 33 * hierarchy. No support is provided for user-written classes which are | |
| 34 * implemented as subclasses of this class. | |
| 35 * </p> | |
| 36 * | |
| 37 * @see #dispose | |
| 38 * @see #isDisposed | |
| 259 | 39 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
| 4 | 40 * |
| 41 * @since 3.1 | |
| 42 */ | |
| 43 public abstract class Resource { | |
| 44 | |
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45 /** |
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46 * the device where this resource was created |
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47 */ |
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48 Device device; |
| 4 | 49 |
| 259 | 50 public this() { |
| 240 | 51 } |
| 52 | |
| 53 this(Device device) { | |
| 54 if (device is null) device = Device.getDevice(); | |
| 55 if (device is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); | |
| 56 this.device = device; | |
| 57 } | |
| 58 | |
| 59 void destroy() { | |
| 60 } | |
| 61 | |
| 4 | 62 /** |
| 63 * Disposes of the operating system resources associated with | |
| 64 * this resource. Applications must dispose of all resources | |
| 65 * which they allocate. | |
| 66 */ | |
| 240 | 67 public void dispose() { |
| 68 if (device is null) return; | |
| 69 if (device.isDisposed()) return; | |
| 70 destroy(); | |
| 71 if (device.tracking) device.dispose_Object(this); | |
| 72 device = null; | |
| 73 } | |
| 4 | 74 |
| 75 /** | |
| 76 * Returns the <code>Device</code> where this resource was | |
| 77 * created. | |
| 78 * | |
| 79 * @return <code>Device</code> the device of the receiver | |
| 80 * | |
| 81 * @since 3.2 | |
| 82 */ | |
| 83 public Device getDevice() { | |
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84 Device device = this.device; |
| 71 | 85 if (device is null || isDisposed ()) DWT.error (DWT.ERROR_GRAPHIC_DISPOSED); |
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86 return device; |
| 4 | 87 } |
| 88 | |
| 240 | 89 void init_() { |
| 90 if (device.tracking) device.new_Object(this); | |
| 91 } | |
| 92 | |
| 4 | 93 /** |
| 94 * Returns <code>true</code> if the resource has been disposed, | |
| 95 * and <code>false</code> otherwise. | |
| 96 * <p> | |
| 97 * This method gets the dispose state for the resource. | |
| 98 * When a resource has been disposed, it is an error to | |
| 99 * invoke any other method using the resource. | |
| 100 * | |
| 101 * @return <code>true</code> when the resource is disposed and <code>false</code> otherwise | |
| 102 */ | |
| 103 public abstract bool isDisposed(); | |
| 104 | |
| 105 } |