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CheckboxTree is a Java Swing component providing a tree-like widget with checkboxes in each node. Checkboxes can toggle between the checked and unchecked state. Disabled and greyed checkboxes are also supported. The CheckboxTree API design is inspired by the JTree interface.

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/*
 * Copyright 2007-2022 Enrico Boldrini, Lorenzo Bigagli This file is part of
 * CheckboxTree. CheckboxTree is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version. CheckboxTree is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details. You should have received a copy of the GNU
 * General Public License along with CheckboxTree; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */
package eu.essilab.lablib.checkboxtree;

import javax.swing.tree.TreePath;

/**
 * PropagateTreeCheckingMode define a TreeCheckingMode with down recursion of
 * the check when nodes are clicked. It toggles the just-clicked checkbox and
 * propagates the change down. In other words, if the clicked checkbox is
 * checked all the descendants will be checked; otherwise all the descendants
 * will be unchecked.
 * 
 * @author Boldrini
 */
public class PropagateTreeCheckingMode extends TreeCheckingMode {

    PropagateTreeCheckingMode(DefaultTreeCheckingModel model) {
	super(model);
    }

    @Override
    public void checkPath(TreePath path) {
	this.model.checkSubTree(path);
	this.model.updatePathGreyness(path);
	this.model.updateAncestorsGreyness(path);
    }

    @Override
    public void uncheckPath(TreePath path) {
	this.model.uncheckSubTree(path);
	this.model.updatePathGreyness(path);
	this.model.updateAncestorsGreyness(path);
    }

    /*
     * (non-Javadoc)
     * 
     * @seeit.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingMode#
     * updateCheckAfterChildrenInserted(javax.swing.tree.TreePath)
     */
    @Override
    public void updateCheckAfterChildrenInserted(TreePath parent) {
	if (this.model.isPathChecked(parent)) {
	    this.model.checkSubTree(parent);
	} else {
	    this.model.uncheckSubTree(parent);
	}
    }

    /*
     * (non-Javadoc)
     * 
     * @seeit.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingMode#
     * updateCheckAfterChildrenRemoved(javax.swing.tree.TreePath)
     */
    @Override
    public void updateCheckAfterChildrenRemoved(TreePath parent) {
	this.model.updatePathGreyness(parent);
	this.model.updateAncestorsGreyness(parent);
    }

    /*
     * (non-Javadoc)
     * 
     * @seeit.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingMode#
     * updateCheckAfterStructureChanged(javax.swing.tree.TreePath)
     */
    @Override
    public void updateCheckAfterStructureChanged(TreePath parent) {
	if (this.model.isPathChecked(parent)) {
	    this.model.checkSubTree(parent);
	} else {
	    this.model.uncheckSubTree(parent);
	}
    }

}