/*******************************************************************************
 * Breakout Cave Survey Visualizer
 *
 * Copyright (C) 2014 James Edwards
 *
 * jedwards8 at fastmail dot fm
 *
 * This program 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.
 *
 * 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 General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *******************************************************************************/
package org.andork.awt.layout;

import java.awt.Component;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class ResizeKnobHandler extends MouseAdapter {
	Component target;

	Side side;
	MouseEvent pressEvent;
	Rectangle pressBounds;

	public ResizeKnobHandler(Component target, Side side) {
		super();
		this.target = target;
		this.side = side;
	}

	@Override
	public void mouseDragged(MouseEvent e) {
		if (pressEvent == null) {
			return;
		}

		Dimension newSize = pressBounds.getSize();

		Axis axis = side.axis();
		axis.setSize(newSize, axis.size(newSize) +
				(axis.get(e.getLocationOnScreen()) - axis.get(pressEvent.getLocationOnScreen())) /
						side.direction());

		Dimension minSize = target.getMinimumSize();
		Dimension maxSize = target.getMaximumSize();

		newSize.width = Math.max(minSize.width, Math.min(maxSize.width, newSize.width));
		newSize.height = Math.max(minSize.height, Math.min(maxSize.height, newSize.height));

		target.setPreferredSize(newSize);
		onResize(target);
	}

	@Override
	public void mousePressed(MouseEvent e) {
		if (e.getButton() == MouseEvent.BUTTON1) {
			pressEvent = e;
			pressBounds = target.getBounds();
		}
	}

	@Override
	public void mouseReleased(MouseEvent e) {
		if (e.getButton() == MouseEvent.BUTTON1) {
			pressEvent = null;
		}
	}

	protected void onResize(Component target) {
		if (target.getParent() != null) {
			if (target.getParent().getLayout() instanceof DelegatingLayoutManager) {
				((DelegatingLayoutManager) target.getParent().getLayout()).onLayoutChanged(target.getParent());
			} else {
				target.getParent().invalidate();
				target.getParent().validate();
			}
		}
	}
}