de.walware.statet.nico.internal.ui.DecoratorsRegistry.java Source code

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Here is the source code for de.walware.statet.nico.internal.ui.DecoratorsRegistry.java

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/*=============================================================================#
 # Copyright (c) 2010-2015 Stephan Wahlbrink (WalWare.de) 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:
 #     Stephan Wahlbrink - initial API and implementation
 #=============================================================================*/

package de.walware.statet.nico.internal.ui;

import java.util.HashMap;

import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.resource.ResourceManager;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.plugin.AbstractUIPlugin;

import de.walware.ecommons.ts.ui.IToolRunnableDecorator;
import de.walware.ecommons.ui.util.UIAccess;

public class DecoratorsRegistry {

    private static final String DECORATORS_EXTENSION_POINT = "de.walware.statet.nico.uiDecorators"; //$NON-NLS-1$

    private static final String RUNNABLE_ELEMENT_NAME = "runnable"; //$NON-NLS-1$

    private static final String RUNNABLE_ID_ATTRIBUTE_NAME = "typeId"; //$NON-NLS-1$
    private static final String ICON_ATTRIBUTE_NAME = "icon"; //$NON-NLS-1$

    private class RunnableDecorator implements IToolRunnableDecorator {

        ImageDescriptor iconDescriptor;

        Image icon;

        @Override
        public Image getImage() {
            if (icon == null && iconDescriptor != null) {
                icon = fManager.createImageWithDefault(iconDescriptor);
            }
            return icon;
        }

    }

    private final HashMap<String, RunnableDecorator> fRunnableIconMap = new HashMap<String, RunnableDecorator>();

    private final Display fDisplay;
    private ResourceManager fManager;

    public DecoratorsRegistry() {
        fDisplay = UIAccess.getDisplay();
        final Runnable runnable = new Runnable() {
            @Override
            public void run() {
                fManager = JFaceResources.getResources(fDisplay);
                fDisplay.disposeExec(new Runnable() {
                    @Override
                    public void run() {
                        DecoratorsRegistry.this.dispose();
                    }
                });
                DecoratorsRegistry.this.load();
            }
        };
        if (fDisplay.getThread() == Thread.currentThread()) {
            runnable.run();
        } else {
            fDisplay.syncExec(runnable);
        }
    }

    private void load() {
        final IConfigurationElement[] configurationElements = Platform.getExtensionRegistry()
                .getConfigurationElementsFor(DECORATORS_EXTENSION_POINT);
        for (final IConfigurationElement configuration : configurationElements) {
            if (configuration.getName().equals(RUNNABLE_ELEMENT_NAME)) {
                final String typeId = configuration.getAttribute(RUNNABLE_ID_ATTRIBUTE_NAME);
                if (typeId == null || typeId.isEmpty()) {
                    // TODO log
                } else {
                    final RunnableDecorator decorators = new RunnableDecorator();
                    final String icon = configuration.getAttribute(ICON_ATTRIBUTE_NAME);
                    final String namespaceId = configuration.getNamespaceIdentifier();
                    if (icon != null && icon.length() > 0) {
                        decorators.iconDescriptor = AbstractUIPlugin.imageDescriptorFromPlugin(namespaceId, icon);
                    }
                    fRunnableIconMap.put(typeId, decorators);
                }
            }
        }
    }

    public IToolRunnableDecorator getDecoratorForRunnable(final String typeId) {
        return fRunnableIconMap.get(typeId);
    }

    private void dispose() {
        for (final RunnableDecorator decorator : fRunnableIconMap.values()) {
            if (decorator.icon != null) {
                fManager.destroyImage(decorator.iconDescriptor);
            }
        }
        fRunnableIconMap.clear();
    }

}