Mercurial > projects > dwt-win
view dwt/graphics/Resource.d @ 213:36f5cb12e1a2
Update to SWT 3.4M7
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 17 May 2008 17:34:28 +0200 |
parents | f906dbcacee5 |
children | fd9c62a2998e |
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/******************************************************************************* * Copyright (c) 2000, 2005 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwt.graphics.Resource; import dwt.DWT; import dwt.graphics.Device; /** * This class is the abstract superclass of all graphics resource objects. * Resources created by the application must be disposed. * <p> * IMPORTANT: This class is intended to be subclassed <em>only</em> * within the DWT implementation. However, it has not been marked * final to allow those outside of the DWT development team to implement * patched versions of the class in order to get around specific * limitations in advance of when those limitations can be addressed * by the team. Any class built using subclassing to access the internals * of this class will likely fail to compile or run between releases and * may be strongly platform specific. Subclassing should not be attempted * without an intimate and detailed understanding of the workings of the * hierarchy. No support is provided for user-written classes which are * implemented as subclasses of this class. * </p> * * @see #dispose * @see #isDisposed * * @since 3.1 */ public abstract class Resource { /** * the device where this resource was created */ Device device; this() { } this(Device device) { if (device is null) device = Device.getDevice(); if (device is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); this.device = device; } void destroy() { } /** * Disposes of the operating system resources associated with * this resource. Applications must dispose of all resources * which they allocate. */ public void dispose() { if (device is null) return; if (device.isDisposed()) return; destroy(); if (device.tracking) device.dispose_Object(this); device = null; } /** * Returns the <code>Device</code> where this resource was * created. * * @return <code>Device</code> the device of the receiver * * @since 3.2 */ public Device getDevice() { Device device = this.device; if (device is null || isDisposed ()) DWT.error (DWT.ERROR_GRAPHIC_DISPOSED); return device; } void init_() { if (device.tracking) device.new_Object(this); } /** * Returns <code>true</code> if the resource has been disposed, * and <code>false</code> otherwise. * <p> * This method gets the dispose state for the resource. * When a resource has been disposed, it is an error to * invoke any other method using the resource. * * @return <code>true</code> when the resource is disposed and <code>false</code> otherwise */ public abstract bool isDisposed(); }