/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.tools.table;

import java.awt.Component;
import java.awt.Point;
import java.awt.event.MouseEvent;

import javax.swing.SwingUtilities;
import javax.swing.event.MouseInputListener;
import javax.swing.plaf.basic.BasicTableHeaderUI;
import javax.swing.table.TableColumnModel;

import com.rapidminer.gui.look.ui.TableHeaderUI;

/**
 * This is an component of the {@link EditableHeaderJTable}. It was retrieved from
 * http://www.java2s.com/Code/Java/Swing-Components/EditableHeaderTableExample2.htm
 * 
 * 
 * @author Sebastian Land
 */
class EditableTableHeaderUI extends TableHeaderUI {

	@Override
	protected MouseInputListener createMouseInputListener() {
		return new MouseInputHandler((EditableTableHeader) header);
	}

	public class MouseInputHandler extends BasicTableHeaderUI.MouseInputHandler {
		private Component dispatchComponent;

		protected EditableTableHeader header;

		public MouseInputHandler(EditableTableHeader header) {
			this.header = header;
		}

		private void setDispatchComponent(MouseEvent e) {
			Component editorComponent = header.getEditorComponent();
			Point p = e.getPoint();
			Point p2 = SwingUtilities.convertPoint(header, p, editorComponent);
			dispatchComponent = SwingUtilities.getDeepestComponentAt(editorComponent, p2.x, p2.y);
		}

		private boolean repostEvent(MouseEvent e) {
			if (dispatchComponent == null) {
				return false;
			}
			MouseEvent e2 = SwingUtilities.convertMouseEvent(header, e, dispatchComponent);
			dispatchComponent.dispatchEvent(e2);
			return true;
		}

		@Override
		public void mousePressed(MouseEvent e) {
			if (!SwingUtilities.isLeftMouseButton(e)) {
				return;
			}
			super.mousePressed(e);

			if (header.getResizingColumn() == null) {
				Point p = e.getPoint();
				TableColumnModel columnModel = header.getColumnModel();
				int index = columnModel.getColumnIndexAtX(p.x);
				if (index != -1) {
					if (header.editCellAt(index, e)) {
						setDispatchComponent(e);
						repostEvent(e);
					}
				}
			}
		}

		@Override
		public void mouseReleased(MouseEvent e) {
			super.mouseReleased(e);
			if (!SwingUtilities.isLeftMouseButton(e)) {
				return;
			}
			repostEvent(e);
			dispatchComponent = null;
		}

	}

}