Re: Checkbox tree component

[javanrell <ja...@gmail.com>]

Hi all, 
I made some changes based on the CheckBoxIconPanel.java posted by Doug,
basically I added behavior to update all parents or childrens when we check
or uncheck a node:
 * When we check a node, we verify all its brothers, if they are all checked
then we check its parent and recursively.
 * When we check a non leaf node we check all its children recursively.
 * When we uncheck a node we uncheck all its parents until the root.
I hope it will useful for someone.

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import javax.swing.tree.TreeNode;

import org.apache.wicket.MarkupContainer;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.markup.html.tree.BaseTree;
import org.apache.wicket.markup.html.tree.LabelIconPanel;
import org.apache.wicket.model.IModel;

/**
 * Simple panel that contains a link with icon and a link with a label.
 * 
 * @author Matej Knopp
 */
public class CheckBoxIconPanel extends LabelIconPanel {
	private static final long serialVersionUID = 1L;

	/**
	 * Constructs the panel.
	 * 
	 * @param id
	 *            component id
	 * @param model
	 *            model that is used to access the TreeNode
	 * @param tree
	 */
	public CheckBoxIconPanel(String id, IModel model, CheckBoxTree tree) {
		super(id, model, tree);
	}
	
	/**
	 * @see
org.apache.wicket.markup.html.tree.LabelIconPanel#addComponents(org.apache.wicket.model.IModel,
	 *      org.apache.wicket.markup.html.tree.BaseTree)
	 */
	protected void addComponents(final IModel model, final BaseTree tree) {
		final CheckBoxTree cbTree = (CheckBoxTree)tree;
		CheckBoxTree.ICheckCallback callback = new CheckBoxTree.ICheckCallback() {
			private static final long serialVersionUID = 1L;

			public void onUpdate(AjaxRequestTarget target) {
				onNodeCheckUpdated((TreeNode)model.getObject(), cbTree, target);
			}
		};

		add(newImageComponent("icon", tree, model));
		
		IModel dataModel = cbTree.newCheckBoxModel((TreeNode)model.getObject());
		MarkupContainer cb = null;
		add( cb = cbTree.newCheckBox("checkbox", dataModel, callback) );
		add(newContentComponent("content", tree, model));
	}

	/**
	 * Handler invoked when the checkbox is clicked. By default makes the node
selected
	 * 
	 * @param node
	 * @param tree
	 * @param target
	 */
	protected void onNodeCheckUpdated(TreeNode node, CheckBoxTree tree,
AjaxRequestTarget target) {
		if (tree.getTreeState().isNodeSelected(node)) {
			deselectAllParent(node, tree);
			selectAllChildren(node, tree, false);
		} else {
			selectAllChildren(node, tree, true);
			updateSelectionIfLastSelected(node, tree);
		}	
		tree.updateTree(target);
	}
	
	/**
	 * When a node of leaf is selected we search for all its brothers, if all
are selected too we select the parent and recursively until the root.
	 * 
	 * @param node
	 * @param tree
	 * @param target
	 */
	protected void updateSelectionIfLastSelected(TreeNode node, CheckBoxTree
tree) {
		TreeNode parent = node.getParent(); 
		while(parent != null) {
			int childCount = parent.getChildCount();
			for (int i = 0; i < childCount; i++) {
				if(!tree.getTreeState().isNodeSelected(parent.getChildAt(i))) {
					return;
				}
			}
			tree.getTreeState().selectNode(parent, true);
			parent = parent.getParent();
		}
	}
	
	/**
	 * When a node / leaf is deselected all its parent are deselected too.
	 * 
	 * @param node
	 * @param tree
	 * @param target
	 */
	protected void deselectAllParent(TreeNode node, CheckBoxTree tree) {
		TreeNode parent = node.getParent(); 
		while(parent != null) {
			tree.getTreeState().selectNode(parent, false);
			parent = parent.getParent();
		}
	}
	
	/**
	 * When a node is selected all its children are selected too
	 * 
	 * @param node
	 * @param tree
	 * @param target
	 */
	protected void selectAllChildren(TreeNode node, CheckBoxTree tree, boolean
check) {
		if (node.isLeaf()) {
			tree.getTreeState().selectNode(node, check);
		} else {
			tree.getTreeState().selectNode(node, check);
			int childCount = node.getChildCount();
			for (int i = 0; i < childCount; i++) {
				selectAllChildren(node.getChildAt(i), tree, check);
			}
		}
	}
}

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