Mercurial > projects > dwt-mac
annotate dwt/graphics/Resource.d @ 45:d8635bb48c7c
Merge with SWT 3.5
author | Jacob Carlborg <doob@me.com> |
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date | Mon, 01 Dec 2008 17:07:00 +0100 |
parents | db5a898b2119 |
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rev | line source |
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45 | 1 /******************************************************************************* |
2 * Copyright (c) 2000, 2008 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: |
45 | 12 * Jacob Carlborg <doob@me.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.DWT; |
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17 |
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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 |
45 | 40 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
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41 * |
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42 * @since 3.1 |
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43 */ |
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44 public abstract class Resource { |
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45 |
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46 /** |
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47 * the device where this resource was created |
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48 */ |
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49 Device device; |
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50 |
45 | 51 public this() { |
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52 } |
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53 |
5 | 54 this(Device device) { |
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55 if (device is null) device = Device.getDevice(); |
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56 if (device is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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57 this.device = device; |
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58 } |
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59 |
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60 void destroy() { |
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61 } |
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62 |
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63 /** |
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64 * Disposes of the operating system resources associated with |
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65 * this resource. Applications must dispose of all resources |
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66 * which they allocate. |
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67 */ |
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68 public void dispose() { |
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69 if (device is null) return; |
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70 if (device.isDisposed()) return; |
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71 destroy(); |
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72 if (device.tracking) device.dispose_Object(this); |
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73 device = null; |
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74 } |
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75 |
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76 /** |
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77 * Returns the <code>Device</code> where this resource was |
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78 * created. |
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79 * |
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80 * @return <code>Device</code> the device of the receiver |
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81 * |
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82 * @since 3.2 |
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83 */ |
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84 public Device getDevice() { |
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85 Device device = this.device; |
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86 if (device is null || isDisposed ()) DWT.error (DWT.ERROR_GRAPHIC_DISPOSED); |
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87 return device; |
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88 } |
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89 |
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90 void init_() { |
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91 if (device.tracking) device.new_Object(this); |
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92 } |
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93 |
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94 /** |
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95 * Returns <code>true</code> if the resource has been disposed, |
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96 * and <code>false</code> otherwise. |
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97 * <p> |
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98 * This method gets the dispose state for the resource. |
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99 * When a resource has been disposed, it is an error to |
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100 * invoke any other method using the resource. |
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101 * |
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102 * @return <code>true</code> when the resource is disposed and <code>false</code> otherwise |
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103 */ |
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104 public abstract bool isDisposed(); |
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105 |
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106 } |