| /******************************************************************************* |
| * Copyright (c) 2004, 2008 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.ui.internal.themes; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.eclipse.jface.resource.ColorRegistry; |
| import org.eclipse.jface.util.IPropertyChangeListener; |
| import org.eclipse.jface.util.PropertyChangeEvent; |
| import org.eclipse.swt.graphics.Color; |
| import org.eclipse.swt.graphics.RGB; |
| import org.eclipse.swt.widgets.Display; |
| import org.eclipse.ui.PlatformUI; |
| |
| /** |
| * @since 3.0 |
| */ |
| public class CascadingColorRegistry extends ColorRegistry { |
| |
| private ColorRegistry parent; |
| |
| private IPropertyChangeListener listener = new IPropertyChangeListener() { |
| public void propertyChange(PropertyChangeEvent event) { |
| // check to see if we have an override for the given key. If so, |
| // then a change in our parent registry shouldn't cause a change in |
| // us. Without this check we will propagate a new value |
| // (event.getNewValue()) to our listeners despite the fact that this |
| // value is NOT our current value. |
| if (!hasOverrideFor(event.getProperty())) |
| fireMappingChanged(event.getProperty(), event.getOldValue(), |
| event.getNewValue()); |
| } |
| }; |
| |
| /** |
| * Create a new instance of this class. |
| * |
| * @param parent the parent registry |
| */ |
| public CascadingColorRegistry(ColorRegistry parent) { |
| super(Display.getCurrent(), false); |
| this.parent = parent; |
| parent.addListener(listener); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.resource.ColorRegistry#get(java.lang.String) |
| */ |
| public Color get(String symbolicName) { |
| if (super.hasValueFor(symbolicName)) { |
| return super.get(symbolicName); |
| } |
| |
| return parent.get(symbolicName); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.resource.ColorRegistry#getKeySet() |
| */ |
| public Set getKeySet() { |
| Set keyUnion = new HashSet(super.getKeySet()); |
| keyUnion.addAll(parent.getKeySet()); |
| return keyUnion; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.resource.ColorRegistry#getRGB(java.lang.String) |
| */ |
| public RGB getRGB(String symbolicName) { |
| if (super.hasValueFor(symbolicName)) { |
| return super.getRGB(symbolicName); |
| } |
| |
| return parent.getRGB(symbolicName); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.resource.ColorRegistry#hasValueFor(java.lang.String) |
| */ |
| public boolean hasValueFor(String colorKey) { |
| return super.hasValueFor(colorKey) || parent.hasValueFor(colorKey); |
| } |
| |
| /** |
| * Returns whether this cascading registry has an override for the provided |
| * color key. |
| * |
| * @param colorKey the provided color key |
| * @return hether this cascading registry has an override |
| */ |
| public boolean hasOverrideFor(String colorKey) { |
| return super.hasValueFor(colorKey); |
| } |
| |
| /** |
| * Disposes of all allocated resources. |
| */ |
| public void dispose() { |
| parent.removeListener(listener); |
| PlatformUI.getWorkbench().getDisplay().asyncExec(displayRunnable); |
| } |
| } |