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1 /*******************************************************************************
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2 * Copyright (c) 2004, 2006 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 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.jface.resource.LocalResourceManager;
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14
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15 import dwtx.jface.resource.AbstractResourceManager;
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16 import dwtx.jface.resource.ResourceManager;
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17 import dwtx.jface.resource.DeviceResourceDescriptor;
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18
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19 import dwt.events.DisposeEvent;
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20 import dwt.events.DisposeListener;
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21 import dwt.graphics.Device;
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22 import dwt.graphics.Image;
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23 import dwt.widgets.Control;
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24
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25 import dwt.dwthelper.utils;
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26
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27 /**
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28 * A local registry that shares its resources with some global registry.
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29 * LocalResourceManager is typically used to safeguard against leaks. Clients
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30 * can use a nested registry to allocate and deallocate resources in the
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31 * global registry. Calling dispose() on the nested registry will deallocate
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32 * everything allocated for the nested registry without affecting the rest
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33 * of the global registry.
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34 * <p>
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35 * A nested registry can be used to manage the resources for, say, a dialog
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36 * box.
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37 * </p>
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38 * @since 3.1
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39 */
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40 public final class LocalResourceManager : AbstractResourceManager {
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41
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42 private ResourceManager parentRegistry;
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43
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44 /**
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45 * Creates a local registry that delegates to the given global registry
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46 * for all resource allocation and deallocation.
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47 *
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48 * @param parentRegistry global registry
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49 */
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50 public this(ResourceManager parentRegistry) {
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51 this.parentRegistry = parentRegistry;
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52 }
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53
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54 /**
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55 * Creates a local registry that wraps the given global registry. Anything
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56 * allocated by this registry will be automatically cleaned up with the given
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57 * control is disposed. Note that registries created in this way should not
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58 * be used to allocate any resource that must outlive the given control.
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59 *
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60 * @param parentRegistry global registry that handles resource allocation
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61 * @param owner control whose disposal will trigger cleanup of everything
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62 * in the registry.
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63 */
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64 public this(ResourceManager parentRegistry, Control owner) {
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65 this(parentRegistry);
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66
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67 owner.addDisposeListener(new class DisposeListener {
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68 /* (non-Javadoc)
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69 * @see dwt.events.DisposeListener#widgetDisposed(dwt.events.DisposeEvent)
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70 */
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71 public void widgetDisposed(DisposeEvent e) {
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72 this.outer.dispose();
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73 }
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74 });
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75 }
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76
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77 /* (non-Javadoc)
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78 * @see dwtx.jface.resource.ResourceManager#getDevice()
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79 */
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80 public Device getDevice() {
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81 return parentRegistry.getDevice();
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82 }
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83
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84 /* (non-Javadoc)
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85 * @see dwtx.jface.resource.AbstractResourceManager#allocate(dwtx.jface.resource.DeviceResourceDescriptor)
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86 */
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87 protected Object allocate(DeviceResourceDescriptor descriptor) {
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88 return parentRegistry.create(descriptor);
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89 }
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90
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91 /* (non-Javadoc)
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92 * @see dwtx.jface.resource.AbstractResourceManager#deallocate(java.lang.Object, dwtx.jface.resource.DeviceResourceDescriptor)
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93 */
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94 protected void deallocate(Object resource,
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95 DeviceResourceDescriptor descriptor) {
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96
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97 parentRegistry.destroy(descriptor);
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98 }
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99
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100 /* (non-Javadoc)
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101 * @see dwtx.jface.resource.ResourceManager#getDefaultImage()
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102 */
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103 protected Image getDefaultImage() {
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104 return parentRegistry.getDefaultImage_();
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105 }
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106 }
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