Mercurial > projects > dwt2
diff org.eclipse.jface/src/org/eclipse/jface/resource/DerivedImageDescriptor.d @ 12:bc29606a740c
Added dwt-addons in original directory structure of eclipse.org
author | Frank Benoit <benoit@tionex.de> |
---|---|
date | Sat, 14 Mar 2009 18:23:29 +0100 |
parents | |
children |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/org.eclipse.jface/src/org/eclipse/jface/resource/DerivedImageDescriptor.d Sat Mar 14 18:23:29 2009 +0100 @@ -0,0 +1,99 @@ +/******************************************************************************* + * Copyright (c) 2005, 2006 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 org.eclipse.jface.resource.DerivedImageDescriptor; + +import org.eclipse.jface.resource.ImageDescriptor; +import org.eclipse.jface.resource.DeviceResourceException; + +import org.eclipse.swt.SWT; +import org.eclipse.swt.SWTException; +import org.eclipse.swt.graphics.Device; +import org.eclipse.swt.graphics.Image; +import org.eclipse.swt.graphics.ImageData; +import org.eclipse.swt.widgets.Display; + +import java.lang.all; + +/** + * An image descriptor which creates images based on another ImageDescriptor, but with + * additional SWT flags. Note that this is only intended for compatibility. + * + * @since 3.1 + */ +final class DerivedImageDescriptor : ImageDescriptor { + alias ImageDescriptor.createImage createImage; + + private ImageDescriptor original; + private int flags; + + /** + * Create a new image descriptor + * @param original the original one + * @param swtFlags flags to be used when image is created {@link Image#Image(Device, Image, int)} + * @see SWT#IMAGE_COPY + * @see SWT#IMAGE_DISABLE + * @see SWT#IMAGE_GRAY + */ + public this(ImageDescriptor original, int swtFlags) { + this.original = original; + flags = swtFlags; + } + + public override Object createResource(Device device) { + try { + return internalCreateImage(device); + } catch (SWTException e) { + throw new DeviceResourceException(this, e); + } + } + + public override Image createImage(Device device) { + return internalCreateImage(device); + } + + public override hash_t toHash() { + return original.toHash() + flags; + } + + public override int opEquals(Object arg0) { + if ( auto desc = cast(DerivedImageDescriptor)arg0 ) { + return desc.original is original && flags is desc.flags; + } + + return false; + } + + /** + * Creates a new Image on the given device. Note that we defined a new + * method rather than overloading createImage since this needs to be + * called by getImageData(), and we want to be absolutely certain not + * to cause infinite recursion if the base class gets refactored. + * + * @param device device to create the image on + * @return a newly allocated Image. Must be disposed by calling image.dispose(). + */ + private final Image internalCreateImage(Device device) { + Image originalImage = original.createImage(device); + Image result = new Image(device, originalImage, flags); + original.destroyResource(originalImage); + return result; + } + + public override ImageData getImageData() { + Image image = internalCreateImage(Display.getCurrent()); + ImageData result = image.getImageData(); + image.dispose(); + return result; + } + +}