Mercurial > projects > dwt-mac
annotate dwt/graphics/Resource.d @ 31:9a3047e87f1d
Ported dwt.graphics.Resource
author | Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com> |
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date | Fri, 12 Sep 2008 12:36:09 +0200 |
parents | 93b13b15f0b1 |
children | db5a898b2119 |
rev | line source |
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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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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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Ported dwt.graphics.Resource
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16 import dwt.DWT; |
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17 |
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Ported dwt.graphics.Resource
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18 import dwt.dwthelper.utils; |
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19 import dwt.graphics.Device; |
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20 |
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21 /** |
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22 * This class is the abstract superclass of all graphics resource objects. |
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23 * Resources created by the application must be disposed. |
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24 * <p> |
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25 * IMPORTANT: This class is intended to be subclassed <em>only</em> |
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26 * within the DWT implementation. However, it has not been marked |
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27 * final to allow those outside of the DWT development team to implement |
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28 * patched versions of the class in order to get around specific |
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29 * limitations in advance of when those limitations can be addressed |
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30 * by the team. Any class built using subclassing to access the internals |
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31 * of this class will likely fail to compile or run between releases and |
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32 * may be strongly platform specific. Subclassing should not be attempted |
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33 * without an intimate and detailed understanding of the workings of the |
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34 * hierarchy. No support is provided for user-written classes which are |
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35 * implemented as subclasses of this class. |
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36 * </p> |
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37 * |
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38 * @see #dispose |
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39 * @see #isDisposed |
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40 * |
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41 * @since 3.1 |
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42 */ |
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43 public abstract class Resource { |
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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; |
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49 |
5 | 50 this() { |
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51 } |
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52 |
5 | 53 this(Device device) { |
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54 if (device is null) device = Device.getDevice(); |
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55 if (device is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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56 this.device = device; |
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57 } |
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58 |
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59 void destroy() { |
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60 } |
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61 |
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62 /** |
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63 * Disposes of the operating system resources associated with |
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64 * this resource. Applications must dispose of all resources |
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65 * which they allocate. |
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66 */ |
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67 public void dispose() { |
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68 if (device is null) return; |
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69 if (device.isDisposed()) return; |
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70 destroy(); |
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71 if (device.tracking) device.dispose_Object(this); |
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72 device = null; |
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73 } |
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74 |
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75 /** |
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76 * Returns the <code>Device</code> where this resource was |
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77 * created. |
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78 * |
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79 * @return <code>Device</code> the device of the receiver |
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80 * |
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81 * @since 3.2 |
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82 */ |
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83 public Device getDevice() { |
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84 Device device = this.device; |
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85 if (device is null || isDisposed ()) DWT.error (DWT.ERROR_GRAPHIC_DISPOSED); |
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86 return device; |
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87 } |
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88 |
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89 void init() { |
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90 if (device.tracking) device.new_Object(this); |
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91 } |
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92 |
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93 /** |
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94 * Returns <code>true</code> if the resource has been disposed, |
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95 * and <code>false</code> otherwise. |
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96 * <p> |
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97 * This method gets the dispose state for the resource. |
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98 * When a resource has been disposed, it is an error to |
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99 * invoke any other method using the resource. |
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100 * |
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101 * @return <code>true</code> when the resource is disposed and <code>false</code> otherwise |
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102 */ |
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103 public abstract bool isDisposed(); |
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104 |
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105 } |