| /******************************************************************************* |
| * Copyright (c) 2000, 2016 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.jdt.internal.ui; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.core.runtime.ListenerList; |
| |
| import org.eclipse.jface.viewers.IDecoration; |
| import org.eclipse.jface.viewers.ILabelProviderListener; |
| import org.eclipse.jface.viewers.ILightweightLabelDecorator; |
| import org.eclipse.jface.viewers.LabelProviderChangedEvent; |
| |
| import org.eclipse.jdt.core.ElementChangedEvent; |
| import org.eclipse.jdt.core.IElementChangedListener; |
| import org.eclipse.jdt.core.IJavaElement; |
| import org.eclipse.jdt.core.IJavaElementDelta; |
| import org.eclipse.jdt.core.JavaCore; |
| |
| public abstract class AbstractJavaElementLabelDecorator implements ILightweightLabelDecorator { |
| |
| private class DecoratorElementChangeListener implements IElementChangedListener { |
| |
| @Override |
| public void elementChanged(ElementChangedEvent event) { |
| List<IJavaElement> changed= new ArrayList<>(); |
| processDelta(event.getDelta(), changed); |
| if (changed.size() == 0) |
| return; |
| |
| fireChange(changed.toArray(new IJavaElement[changed.size()])); |
| } |
| |
| } |
| |
| private ListenerList<ILabelProviderListener> fListeners; |
| private IElementChangedListener fChangeListener; |
| |
| @Override |
| public void addListener(ILabelProviderListener listener) { |
| if (fChangeListener == null) { |
| fChangeListener= new DecoratorElementChangeListener(); |
| JavaCore.addElementChangedListener(fChangeListener); |
| } |
| |
| if (fListeners == null) { |
| fListeners= new ListenerList<>(); |
| } |
| |
| fListeners.add(listener); |
| } |
| |
| @Override |
| public void dispose() { |
| if (fChangeListener != null) { |
| JavaCore.removeElementChangedListener(fChangeListener); |
| fChangeListener= null; |
| } |
| if (fListeners != null) { |
| for (ILabelProviderListener listener : fListeners) { |
| fListeners.remove(listener); |
| } |
| fListeners= null; |
| } |
| } |
| |
| @Override |
| public boolean isLabelProperty(Object element, String property) { |
| return false; |
| } |
| |
| @Override |
| public void removeListener(ILabelProviderListener listener) { |
| if (fListeners == null) |
| return; |
| |
| fListeners.remove(listener); |
| |
| if (fListeners.isEmpty() && fChangeListener != null) { |
| JavaCore.removeElementChangedListener(fChangeListener); |
| fChangeListener= null; |
| } |
| } |
| |
| private void fireChange(IJavaElement[] elements) { |
| if (fListeners != null && !fListeners.isEmpty()) { |
| LabelProviderChangedEvent event= new LabelProviderChangedEvent(this, elements); |
| for (ILabelProviderListener listener : fListeners) { |
| listener.labelProviderChanged(event); |
| } |
| } |
| } |
| |
| @Override |
| public abstract void decorate(Object element, IDecoration decoration); |
| |
| protected abstract void processDelta(IJavaElementDelta delta, List<IJavaElement> result); |
| |
| protected boolean processChildrenDelta(IJavaElementDelta delta, List<IJavaElement> result) { |
| IJavaElementDelta[] children= delta.getAffectedChildren(); |
| for (int i= 0; i < children.length; i++) { |
| processDelta(children[i], result); |
| } |
| return false; |
| } |
| |
| } |