| /******************************************************************************* |
| * Copyright (c) 2000, 2010 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.gef.ui.palette.customize; |
| |
| import java.beans.PropertyChangeEvent; |
| import java.beans.PropertyChangeListener; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.eclipse.jface.viewers.ITreeContentProvider; |
| import org.eclipse.jface.viewers.TreeViewer; |
| import org.eclipse.jface.viewers.Viewer; |
| |
| import org.eclipse.gef.palette.PaletteContainer; |
| import org.eclipse.gef.palette.PaletteEntry; |
| import org.eclipse.gef.palette.PaletteRoot; |
| |
| /** |
| * This is the {@link org.eclipse.jface.viewers.IContentProvider} for the |
| * {@link org.eclipse.jface.viewers.TreeViewer} used in |
| * {@link org.eclipse.gef.ui.palette.customize.PaletteCustomizerDialog}. |
| * |
| * @author Pratik Shah |
| * @see org.eclipse.jface.viewer.TreeViewer |
| * @see org.eclipse.gef.ui.palette.customize.PaletteCustomizerDialog |
| */ |
| class PaletteTreeProvider implements ITreeContentProvider { |
| |
| private TreeViewer viewer; |
| private PaletteRoot root; |
| private PropertyChangeListener modelListener = new PropertyChangeListener() { |
| public void propertyChange(PropertyChangeEvent evt) { |
| handlePropertyChanged(evt); |
| } |
| }; |
| |
| /** |
| * Constructor |
| * |
| * @param treeviewer |
| * The TreeViewer whose ContentProvider this PaletteTreeProvider |
| * is |
| */ |
| public PaletteTreeProvider(TreeViewer treeviewer) { |
| this.viewer = treeviewer; |
| } |
| |
| /** |
| * Stops listening to the model |
| * |
| * @see org.eclipse.jface.viewers.IContentProvider#dispose() |
| */ |
| public void dispose() { |
| traverseModel(root, false); |
| } |
| |
| /** |
| * If the given element does not have any children, this method should |
| * return <code>null</code>. This fixes the problem where a "+" sign is |
| * incorrectly placed next to an empty container in the tree. |
| * |
| * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(Object) |
| */ |
| public Object[] getChildren(Object parentElement) { |
| if (parentElement instanceof PaletteContainer) { |
| List children = ((PaletteContainer) parentElement).getChildren(); |
| if (!children.isEmpty()) { |
| return children.toArray(); |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(Object) |
| */ |
| public boolean hasChildren(Object element) { |
| return getChildren(element) != null; |
| } |
| |
| /** |
| * This method should not return <code>null</code>. |
| * |
| * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(Object) |
| */ |
| public Object[] getElements(Object inputElement) { |
| Object[] elements = getChildren(inputElement); |
| if (elements == null) { |
| elements = new Object[0]; |
| } |
| return elements; |
| } |
| |
| /** |
| * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(Object) |
| */ |
| public Object getParent(Object element) { |
| return ((PaletteEntry) element).getParent(); |
| } |
| |
| /** |
| * This method is invoked whenever there is any change in the model. It |
| * updates the viewer with the changes that were made to the model. |
| * Sub-classes may override this method to change or extend its |
| * functionality. |
| * |
| * @param evt |
| * The {@link PropertyChangeEvent} that was fired from the model |
| */ |
| protected void handlePropertyChanged(PropertyChangeEvent evt) { |
| PaletteEntry entry = ((PaletteEntry) evt.getSource()); |
| String property = evt.getPropertyName(); |
| if (property.equals(PaletteEntry.PROPERTY_LABEL) |
| || property.equals(PaletteEntry.PROPERTY_SMALL_ICON)) { |
| viewer.update(entry, null); |
| } else if (property.equals(PaletteEntry.PROPERTY_VISIBLE)) { |
| viewer.refresh(entry); |
| } else if (property.equals(PaletteContainer.PROPERTY_CHILDREN)) { |
| viewer.refresh(entry); |
| List oldChildren = (List) evt.getOldValue(); |
| for (Iterator iter = oldChildren.iterator(); iter.hasNext();) { |
| PaletteEntry child = (PaletteEntry) iter.next(); |
| traverseModel(child, false); |
| } |
| traverseModel(entry, true); |
| } |
| } |
| |
| /** |
| * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(Viewer, |
| * Object, Object) |
| */ |
| public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { |
| if (root != null) |
| traverseModel(root, false); |
| if (newInput != null) { |
| root = (PaletteRoot) newInput; |
| traverseModel(root, true); |
| } |
| } |
| |
| private void traverseModel(PaletteEntry entry, boolean isHook) { |
| if (isHook) { |
| entry.addPropertyChangeListener(modelListener); |
| } else { |
| entry.removePropertyChangeListener(modelListener); |
| } |
| |
| if (hasChildren(entry)) { |
| Object[] children = getChildren(entry); |
| for (int i = 0; i < children.length; i++) { |
| traverseModel((PaletteEntry) children[i], isHook); |
| } |
| } |
| } |
| |
| } |