| /******************************************************************************* |
| * Copyright (c) 2003, 2006 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.jface.preference; |
| |
| import org.eclipse.jface.viewers.ITreeContentProvider; |
| import org.eclipse.jface.viewers.Viewer; |
| |
| /** |
| * Provides a tree model for <code>PreferenceManager</code> content. |
| * |
| * @since 3.0 |
| */ |
| public class PreferenceContentProvider implements ITreeContentProvider { |
| |
| private PreferenceManager manager; |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.viewers.IContentProvider#dispose() |
| */ |
| public void dispose() { |
| manager = null; |
| } |
| |
| /** |
| * Find the parent of the provided node. Will search recursivly through the |
| * preference tree. |
| * |
| * @param parent the possible parent node. |
| * @param target the target child node. |
| * @return the parent node of the child node. |
| */ |
| private IPreferenceNode findParent(IPreferenceNode parent, |
| IPreferenceNode target) { |
| if (parent.getId().equals(target.getId())) { |
| return null; |
| } |
| |
| IPreferenceNode found = parent.findSubNode(target.getId()); |
| if (found != null) { |
| return parent; |
| } |
| |
| IPreferenceNode[] children = parent.getSubNodes(); |
| |
| for (int i = 0; i < children.length; i++) { |
| found = findParent(children[i], target); |
| if (found != null) { |
| return found; |
| } |
| } |
| |
| return null; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object) |
| */ |
| public Object[] getChildren(Object parentElement) {//must be an instance of <code>IPreferenceNode</code>. |
| return ((IPreferenceNode) parentElement).getSubNodes(); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object) |
| */ |
| public Object[] getElements(Object inputElement) {// must be an instance of <code>PreferenceManager</code>. |
| return getChildren(((PreferenceManager) inputElement).getRoot()); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object) |
| */ |
| public Object getParent(Object element) {//must be an instance of <code>IPreferenceNode</code>. |
| IPreferenceNode targetNode = (IPreferenceNode) element; |
| IPreferenceNode root = manager.getRoot(); |
| return findParent(root, targetNode); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object) |
| */ |
| public boolean hasChildren(Object element) { |
| return getChildren(element).length > 0; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object) |
| */ |
| public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { |
| manager = (PreferenceManager) newInput; |
| } |
| /** |
| * Set the manager for the preferences. |
| * @param manager The manager to set. |
| * |
| * @since 3.1 |
| */ |
| protected void setManager(PreferenceManager manager) { |
| this.manager = manager; |
| } |
| } |