/* ********************************************************************** **
** Copyright notice **
** **
** (c) 2005-2006 RSSOwl Development Team **
** http://www.rssowl.org/ **
** **
** 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.rssowl.org/legal/epl-v10.html **
** **
** A copy is found in the file epl-v10.html and important notices to the **
** license from the team is found in the textfile LICENSE.txt distributed **
** in this package. **
** **
** This copyright notice MUST APPEAR in all copies of the file! **
** **
** Contributors: **
** RSSOwl Development Team - initial API and implementation **
** **
** ********************************************************************** */
package org.rssowl.ui.internal.util;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
import org.eclipse.swt.widgets.Widget;
import org.rssowl.ui.internal.views.explorer.BookMarkViewer;
/**
* A concrete implementation of <code>ITreeNode</code> working on SWT-Tree and
* TreeItem.
*
* @author bpasero
*/
public class WidgetTreeNode implements ITreeNode {
private TreeItem fItem;
private Tree fTree;
private TreeViewer fViewer;
/**
* Create a new ITreeNode wrapping a Tree.
*
* @param tree The Tree to wrap inside this helper.
* @param viewer The Viewer that manages the given Tree.
*/
public WidgetTreeNode(Tree tree, TreeViewer viewer) {
fTree = tree;
fViewer = viewer;
}
/**
* Create a new ITreeNode wrapping a TreeItem.
*
* @param item The Item to wrap inside this helper.
* @param viewer The Viewer that manages the given TreeItem.
*/
public WidgetTreeNode(TreeItem item, TreeViewer viewer) {
fItem = item;
fViewer = viewer;
}
/*
* @see org.rssowl.ui.internal.util.ITreeNode#getFirstChild()
*/
public ITreeNode getFirstChild() {
/* Retrieve from Tree */
if (isSet(fTree) && fTree.getItemCount() > 0)
return new WidgetTreeNode(fTree.getItem(0), fViewer);
/* Retrieve from TreeItem */
if (isSet(fItem) && fItem.getItemCount() > 0)
return new WidgetTreeNode(fItem.getItem(0), fViewer);
return null;
}
/*
* @see org.rssowl.ui.internal.util.ITreeNode#getLastChild()
*/
public ITreeNode getLastChild() {
/* Retrieve from Tree */
if (isSet(fTree)) {
int itemCount = fTree.getItemCount();
if (itemCount > 0)
return new WidgetTreeNode(fTree.getItem(itemCount - 1), fViewer);
}
/* Retrieve from TreeItem */
if (isSet(fItem)) {
int itemCount = fItem.getItemCount();
if (itemCount > 0)
return new WidgetTreeNode(fItem.getItem(itemCount - 1), fViewer);
}
return null;
}
/*
* @see org.rssowl.ui.internal.util.ITreeNode#getNextSibling()
*/
public ITreeNode getNextSibling() {
/* Require a Tree-Item here */
if (!isSet(fItem))
return null;
TreeItem parent = fItem.getParentItem();
/* Item is not Root-Leveld */
if (isSet(parent)) {
int index = parent.indexOf(fItem);
if (parent.getItemCount() > index + 1)
return new WidgetTreeNode(parent.getItem(index + 1), fViewer);
return null;
}
/* Item is Root-Leveld */
Tree tree = fItem.getParent();
int index = tree.indexOf(fItem);
if (tree.getItemCount() > index + 1)
return new WidgetTreeNode(tree.getItem(index + 1), fViewer);
return null;
}
/*
* @see org.rssowl.ui.internal.util.ITreeNode#getParent()
*/
public ITreeNode getParent() {
if (isSet(fTree) || !isSet(fItem))
return null;
return new WidgetTreeNode(fItem.getParentItem(), fViewer);
}
/*
* @see org.rssowl.ui.internal.util.ITreeNode#getPreviousSibling()
*/
public ITreeNode getPreviousSibling() {
/* Require a Tree-Item here */
if (!isSet(fItem))
return null;
TreeItem parent = fItem.getParentItem();
/* Item is not Root-Leveld */
if (isSet(parent)) {
int index = parent.indexOf(fItem);
if (index > 0)
return new WidgetTreeNode(parent.getItem(index - 1), fViewer);
return null;
}
/* Item is Root-Leveld */
Tree tree = fItem.getParent();
int index = tree.indexOf(fItem);
if (index > 0)
return new WidgetTreeNode(tree.getItem(index - 1), fViewer);
return null;
}
/*
* @see org.rssowl.ui.internal.util.ITreeNode#hasChildren()
*/
public boolean hasChildren() {
/* Ask Tree */
if (isSet(fTree))
return fTree.getItemCount() > 0;
/* Ask Item */
if (isSet(fItem)) {
/* Make sure that children of this branch are populated (TODO Hack!) */
if (fViewer instanceof BookMarkViewer && !fItem.getExpanded() && fItem.getItemCount() == 1)
((BookMarkViewer) fViewer).createChildren(fItem);
return fItem.getItemCount() > 0;
}
return false;
}
/*
* @see org.rssowl.ui.internal.util.ITreeNode#getData()
*/
public Object getData() {
/* Ask Tree */
if (isSet(fTree))
return fTree.getData();
/* Ask Item */
if (isSet(fItem))
return fItem.getData();
return null;
}
private boolean isSet(Widget item) {
return item != null && !item.isDisposed();
}
}