325 lines
11 KiB
Java
325 lines
11 KiB
Java
/*******************************************************************************
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* Copyright (c) 2011 Google, Inc. and others
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* Google, Inc. - initial API and implementation
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* Wim Jongman - 1.8 and higher compliance
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*******************************************************************************/
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package org.eclipse.wb.swt;
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import java.io.File;
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import java.io.InputStream;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import org.eclipse.core.runtime.Platform;
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import org.eclipse.jface.resource.CompositeImageDescriptor;
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import org.eclipse.jface.resource.ImageDescriptor;
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import org.eclipse.swt.graphics.Image;
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import org.eclipse.swt.graphics.ImageData;
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import org.eclipse.swt.graphics.ImageDataProvider;
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import org.eclipse.swt.graphics.Point;
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import org.eclipse.swt.graphics.Rectangle;
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import org.osgi.framework.Bundle;
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import com.minres.scviewer.e4.application.Messages;
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/**
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* Utility class for managing OS resources associated with SWT/JFace controls
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* such as colors, fonts, images, etc.
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*
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* This class is created automatically when you fiddle around with images and
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* colors in WB. You might want to prevent your application from using this
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* class and provide your own more effective means of resource caching.
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*
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* Even though this class can be used to manage these resources, if they are
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* here for the duration of the application and not used then you still have an
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* effective resource leak.
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*
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* Application code must explicitly invoke the <code>dispose()</code> method to
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* release the operating system resources managed by cached objects when those
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* objects and OS resources are no longer needed.
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*
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* This class may be freely distributed as part of any application or plugin.
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* <p>
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*
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* @author scheglov_ke
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* @author Dan Rubel
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* @author Wim Jongman
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*/
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public class ResourceManager extends SWTResourceManager {
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/**
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* The map where we store our images.
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*/
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private static Map<ImageDescriptor, Image> descriptorImageMap = new HashMap<>();
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/**
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* Returns an {@link ImageDescriptor} stored in the file at the specified path
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* relative to the specified class.
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*
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* @param clazz the {@link Class} relative to which to find the image
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* descriptor.
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* @param path the path to the image file.
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* @return the {@link ImageDescriptor} stored in the file at the specified path.
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*/
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public static ImageDescriptor getImageDescriptor(Class<?> clazz, String path) {
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return ImageDescriptor.createFromFile(clazz, path);
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}
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/**
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* Returns an {@link ImageDescriptor} stored in the file at the specified path.
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*
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* @param path the path to the image file.
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* @return the {@link ImageDescriptor} stored in the file at the specified path.
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*/
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public static ImageDescriptor getImageDescriptor(String path) {
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try {
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return ImageDescriptor.createFromURL(new File(path).toURI().toURL());
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} catch (MalformedURLException e) {
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return null;
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}
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}
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/**
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* Returns an {@link Image} based on the specified {@link ImageDescriptor}.
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*
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* @param descriptor the {@link ImageDescriptor} for the {@link Image}.
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* @return the {@link Image} based on the specified {@link ImageDescriptor}.
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*/
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public static Image getImage(ImageDescriptor descriptor) {
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if (descriptor == null)
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return null;
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return descriptorImageMap.computeIfAbsent(descriptor, ImageDescriptor::createImage);
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}
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/**
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* Maps images to decorated images.
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*/
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@SuppressWarnings("unchecked")
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private static Map<Image, Map<Image, Image>>[] decoratedImageMap = new Map[LAST_CORNER_KEY];
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/**
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* Returns an {@link Image} composed of a base image decorated by another image.
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*
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* @param baseImage the base {@link Image} that should be decorated.
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* @param decorator the {@link Image} to decorate the base image.
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* @return {@link Image} The resulting decorated image.
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*/
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public static Image decorateImage(Image baseImage, Image decorator) {
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return decorateImage(baseImage, decorator, BOTTOM_RIGHT);
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}
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/**
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* Returns an {@link Image} composed of a base image decorated by another image.
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*
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* @param baseImage
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* the base {@link Image} that should be decorated.
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* @param decorator
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* the {@link Image} to decorate the base image.
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* @param corner
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* the corner to place decorator image.
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* @return the resulting decorated {@link Image}.
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*/
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public static Image decorateImage(final Image baseImage, final Image decorator, final int corner) {
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if (corner <= 0 || corner >= LAST_CORNER_KEY) {
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throw new IllegalArgumentException(Messages.ResourceManager_0);
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}
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Map<Image, Map<Image, Image>> cornerDecoratedImageMap = decoratedImageMap[corner];
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if (cornerDecoratedImageMap == null) {
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cornerDecoratedImageMap = new HashMap<>();
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decoratedImageMap[corner] = cornerDecoratedImageMap;
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}
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Map<Image, Image> decoratedMap = cornerDecoratedImageMap.computeIfAbsent(baseImage, k -> new HashMap<Image, Image>());
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Image result = decoratedMap.get(decorator);
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if (result == null) {
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final Rectangle bib = baseImage.getBounds();
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final Rectangle dib = decorator.getBounds();
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final Point baseImageSize = new Point(bib.width, bib.height);
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CompositeImageDescriptor compositImageDesc = new CompositeImageDescriptor() {
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@Override
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protected void drawCompositeImage(int width, int height) {
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drawImage(createCachedImageDataProvider(baseImage), 0, 0);
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if (corner == TOP_LEFT) {
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drawImage(getUnzoomedImageDataProvider(decorator.getImageData()) , 0, 0);
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} else if (corner == TOP_RIGHT) {
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drawImage(getUnzoomedImageDataProvider(decorator.getImageData()), bib.width - dib.width, 0);
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} else if (corner == BOTTOM_LEFT) {
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drawImage(getUnzoomedImageDataProvider(decorator.getImageData()), 0, bib.height - dib.height);
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} else if (corner == BOTTOM_RIGHT) {
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drawImage(getUnzoomedImageDataProvider(decorator.getImageData()), bib.width - dib.width, bib.height - dib.height);
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}
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}
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@Override
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protected Point getSize() {
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return baseImageSize;
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}
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};
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//
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result = compositImageDesc.createImage();
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decoratedMap.put(decorator, result);
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}
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return result;
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}
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private static ImageDataProvider getUnzoomedImageDataProvider(ImageData imageData) {
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return zoom -> zoom == 100 ? imageData : null;
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}
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/**
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* Dispose all of the cached images.
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*/
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public static void disposeImages() {
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SWTResourceManager.disposeImages();
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// dispose ImageDescriptor images
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for (Iterator<Image> I = descriptorImageMap.values().iterator(); I.hasNext();) {
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I.next().dispose();
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}
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descriptorImageMap.clear();
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// dispose decorated images
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for (int i = 0; i < decoratedImageMap.length; i++) {
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Map<Image, Map<Image, Image>> cornerDecoratedImageMap = decoratedImageMap[i];
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if (cornerDecoratedImageMap != null) {
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for (Map<Image, Image> decoratedMap : cornerDecoratedImageMap.values()) {
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for (Image image : decoratedMap.values()) {
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image.dispose();
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}
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decoratedMap.clear();
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}
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cornerDecoratedImageMap.clear();
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}
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}
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// dispose plugin images
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for (Iterator<Image> I = urlImageMap.values().iterator(); I.hasNext();) {
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I.next().dispose();
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}
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urlImageMap.clear();
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}
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////////////////////////////////////////////////////////////////////////////
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//
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// Plugin images support
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//
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////////////////////////////////////////////////////////////////////////////
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/**
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* Maps URL to images.
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*/
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private static Map<String, Image> urlImageMap = new HashMap<>();
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/**
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* Provider for plugin resources, used by WindowBuilder at design time.
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*/
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public interface PluginResourceProvider {
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URL getEntry(String symbolicName, String path);
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}
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/**
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* Instance of {@link PluginResourceProvider}, used by WindowBuilder at design
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* time.
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*/
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private static PluginResourceProvider designTimePluginResourceProvider = null;
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/**
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* Returns an {@link Image} based on a {@link Bundle} and resource entry path.
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*
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* @param symbolicName the symbolic name of the {@link Bundle}.
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* @param path the path of the resource entry.
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* @return the {@link Image} stored in the file at the specified path.
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*/
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public static Image getPluginImage(String symbolicName, String path) {
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try {
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URL url = getPluginImageURL(symbolicName, path);
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if (url != null) {
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return getPluginImageFromUrl(url);
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}
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} catch (Exception e) {
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// Ignore any exceptions
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}
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return null;
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}
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/**
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* Returns an {@link Image} based on given {@link URL}.
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*/
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private static Image getPluginImageFromUrl(URL url) {
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try {
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String key = url.toExternalForm();
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Image image = urlImageMap.get(key);
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if (image == null) {
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InputStream stream = url.openStream();
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try {
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image = getImage(stream);
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urlImageMap.put(key, image);
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} finally {
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stream.close();
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}
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}
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return image;
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} catch (Exception e) {
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// Ignore any exceptions
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}
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return null;
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}
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/**
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* Returns an {@link ImageDescriptor} based on a {@link Bundle} and resource
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* entry path.
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*
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* @param symbolicName the symbolic name of the {@link Bundle}.
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* @param path the path of the resource entry.
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* @return the {@link ImageDescriptor} based on a {@link Bundle} and resource
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* entry path.
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*/
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public static ImageDescriptor getPluginImageDescriptor(String symbolicName, String path) {
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try {
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URL url = getPluginImageURL(symbolicName, path);
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if (url != null) {
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return ImageDescriptor.createFromURL(url);
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}
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} catch (Exception e) {
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// Ignore any exceptions
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}
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return null;
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}
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/**
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* Returns an {@link URL} based on a {@link Bundle} and resource entry path.
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*/
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private static URL getPluginImageURL(String symbolicName, String path) {
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// try runtime plugins
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Bundle bundle = Platform.getBundle(symbolicName);
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if (bundle != null) {
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return bundle.getEntry(path);
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}
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// try design time provider
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if (designTimePluginResourceProvider != null) {
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return designTimePluginResourceProvider.getEntry(symbolicName, path);
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}
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// no such resource
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return null;
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}
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////////////////////////////////////////////////////////////////////////////
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//
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// General
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//
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////////////////////////////////////////////////////////////////////////////
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/**
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* Dispose of cached objects and their underlying OS resources. This should only
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* be called when the cached objects are no longer needed (e.g. on application
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* shutdown).
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*/
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public static void dispose() {
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disposeColors();
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disposeFonts();
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disposeImages();
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}
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} |