| /******************************************************************************* |
| * 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 |
| *******************************************************************************/ |
| package org.eclipse.jface.resource; |
| |
| 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; |
| |
| /** |
| * 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 extends ImageDescriptor { |
| |
| 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 DerivedImageDescriptor(ImageDescriptor original, int swtFlags) { |
| this.original = original; |
| flags = swtFlags; |
| } |
| |
| public Object createResource(Device device) throws DeviceResourceException { |
| try { |
| return internalCreateImage(device); |
| } catch (SWTException e) { |
| throw new DeviceResourceException(this, e); |
| } |
| } |
| |
| public Image createImage(Device device) { |
| return internalCreateImage(device); |
| } |
| |
| public int hashCode() { |
| return original.hashCode() + flags; |
| } |
| |
| public boolean equals(Object arg0) { |
| if (arg0 instanceof DerivedImageDescriptor) { |
| DerivedImageDescriptor desc = (DerivedImageDescriptor)arg0; |
| |
| return desc.original == original && flags == 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 ImageData getImageData() { |
| Image image = internalCreateImage(Display.getCurrent()); |
| ImageData result = image.getImageData(); |
| image.dispose(); |
| return result; |
| } |
| |
| } |