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annotate dwt/graphics/Resource.d @ 30:93b13b15f0b1

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Ported a couple of modules in dwt.graphics
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Thu, 11 Sep 2008 23:16:53 +0200
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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93b13b15f0b1 Ported a couple of modules in dwt.graphics
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10 *
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11 * Port to the D programming language:
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12 * Jacob Carlborg <jacob.carlborg@gmail.com>
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13 *******************************************************************************/
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14 module dwt.graphics.Resource;
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15
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16 import dwt.dwthelper.utils;
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17
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18 import dwt.DWT;
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19
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20 /**
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21 * This class is the abstract superclass of all graphics resource objects.
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22 * Resources created by the application must be disposed.
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23 * <p>
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24 * IMPORTANT: This class is intended to be subclassed <em>only</em>
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25 * within the DWT implementation. However, it has not been marked
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26 * final to allow those outside of the DWT development team to implement
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27 * patched versions of the class in order to get around specific
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28 * limitations in advance of when those limitations can be addressed
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29 * by the team. Any class built using subclassing to access the internals
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30 * of this class will likely fail to compile or run between releases and
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31 * may be strongly platform specific. Subclassing should not be attempted
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32 * without an intimate and detailed understanding of the workings of the
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33 * hierarchy. No support is provided for user-written classes which are
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34 * implemented as subclasses of this class.
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35 * </p>
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36 *
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37 * @see #dispose
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38 * @see #isDisposed
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39 *
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40 * @since 3.1
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41 */
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42 public abstract class Resource {
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43
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44 /**
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45 * the device where this resource was created
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46 */
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47 Device device;
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48
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49 this() {
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50 }
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51
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52 this(Device device) {
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53 if (device is null) device = Device.getDevice();
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54 if (device is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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55 this.device = device;
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56 }
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57
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58 void destroy() {
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59 }
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60
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61 /**
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62 * Disposes of the operating system resources associated with
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63 * this resource. Applications must dispose of all resources
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64 * which they allocate.
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65 */
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66 public void dispose() {
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67 if (device is null) return;
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68 if (device.isDisposed()) return;
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69 destroy();
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70 if (device.tracking) device.dispose_Object(this);
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71 device = null;
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72 }
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73
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74 /**
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75 * Returns the <code>Device</code> where this resource was
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76 * created.
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77 *
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78 * @return <code>Device</code> the device of the receiver
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79 *
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80 * @since 3.2
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81 */
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82 public Device getDevice() {
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83 Device device = this.device;
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84 if (device is null || isDisposed ()) DWT.error (DWT.ERROR_GRAPHIC_DISPOSED);
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85 return device;
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86 }
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87
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88 void init() {
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89 if (device.tracking) device.new_Object(this);
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90 }
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91
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92 /**
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93 * Returns <code>true</code> if the resource has been disposed,
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94 * and <code>false</code> otherwise.
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95 * <p>
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96 * This method gets the dispose state for the resource.
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97 * When a resource has been disposed, it is an error to
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98 * invoke any other method using the resource.
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99 *
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100 * @return <code>true</code> when the resource is disposed and <code>false</code> otherwise
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101 */
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102 public abstract bool isDisposed();
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103
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104 }