| /******************************************************************************* |
| * Copyright (c) 2004, 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.graphics.Device; |
| import org.eclipse.swt.graphics.Image; |
| |
| /** |
| * Manages SWT resources for a particular device. |
| * |
| * <p> |
| * IMPORTANT: in most cases clients should use a <code>LocalResourceManager</code> instead of a |
| * <code>DeviceResourceManager</code>. To create a resource manager on a particular display, |
| * use <code>new LocalResourceManager(JFaceResources.getResources(myDisplay))</code>. |
| * <code>DeviceResourceManager</code> should only be used directly when managing |
| * resources for a device other than a Display (such as a printer). |
| * </p> |
| * |
| * @see LocalResourceManager |
| * |
| * @since 3.1 |
| */ |
| public final class DeviceResourceManager extends AbstractResourceManager { |
| |
| private Device device; |
| private Image missingImage; |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.resource.ResourceManager#getDevice() |
| */ |
| public Device getDevice() { |
| return device; |
| } |
| |
| /** |
| * Creates a new registry for the given device. |
| * |
| * @param device device to manage |
| */ |
| public DeviceResourceManager(Device device) { |
| this.device = device; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.resource.AbstractResourceManager#allocate(org.eclipse.jface.resource.DeviceResourceDescriptor) |
| */ |
| protected Object allocate(DeviceResourceDescriptor descriptor) throws DeviceResourceException { |
| return descriptor.createResource(device); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.resource.AbstractResourceManager#deallocate(java.lang.Object, org.eclipse.jface.resource.DeviceResourceDescriptor) |
| */ |
| protected void deallocate(Object resource, DeviceResourceDescriptor descriptor) { |
| descriptor.destroyResource(resource); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.resource.ResourceManager#getDefaultImage() |
| */ |
| protected Image getDefaultImage() { |
| if (missingImage == null) { |
| missingImage = ImageDescriptor.getMissingImageDescriptor().createImage(); |
| } |
| return missingImage; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.resource.AbstractResourceManager#dispose() |
| */ |
| public void dispose() { |
| super.dispose(); |
| if (missingImage != null) { |
| missingImage.dispose(); |
| missingImage = null; |
| } |
| } |
| } |