Scrollbar.java

/*
 *  This file is part of the Haven & Hearth game client.
 *  Copyright (C) 2009 Fredrik Tolf <fredrik@dolda2000.com>, and
 *                     Björn Johannessen <johannessen.bjorn@gmail.com>
 *
 *  Redistribution and/or modification of this file is subject to the
 *  terms of the GNU Lesser General Public License, version 3, as
 *  published by the Free Software Foundation.
 *
 *  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.
 *
 *  Other parts of this source tree adhere to other copying
 *  rights. Please see the file `COPYING' in the root directory of the
 *  source tree for details.
 *
 *  A copy the GNU Lesser General Public License is distributed along
 *  with the source tree of which this file is a part in the file
 *  `doc/LPGL-3'. If it is missing for any reason, please see the Free
 *  Software Foundation's website at <http://www.fsf.org/>, or write
 *  to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 *  Boston, MA 02111-1307 USA
 */

package haven;

public class Scrollbar extends Widget {
	static Tex texpap = Resource.loadtex("gfx/hud/texpap");
	static Tex schain = Resource.loadtex("gfx/hud/schain");
	static Tex sflarp = Resource.loadtex("gfx/hud/sflarp");
	public int val, min, max;
	private boolean drag = false;

	public Scrollbar(Coord c, int h, Widget parent, int min, int max) {
		super(c.add(-sflarp.sz().x, 0), new Coord(sflarp.sz().x, h), parent);
		this.min = min;
		this.max = max;
		val = min;
	}

	public void draw(GOut g) {
		if (max > min) {
			int cx = (sflarp.sz().x / 2) - (schain.sz().x / 2);
			for (int y = 0; y < sz.y; y += schain.sz().y - 1)
				g.image(schain, new Coord(cx, y));
			double a = (double) val / (double) (max - min);
			int fy = (int) ((sz.y - sflarp.sz().y) * a);
			g.image(sflarp, new Coord(0, fy));
		}
	}

	public boolean mousedown(Coord c, int button) {
		if (button != 1)
			return (false);
		if (max <= min)
			return (false);
		drag = true;
		ui.grabmouse(this);
		mousemove(c);
		return (true);
	}

	public void mousemove(Coord c) {
		if (drag) {
			double a = (double) (c.y - (sflarp.sz().y / 2)) / (double) (sz.y - sflarp.sz().y);
			if (a < 0)
				a = 0;
			if (a > 1)
				a = 1;
			val = (int) Math.round(a * (max - min)) + min;
			changed();
		}
	}

	public boolean mouseup(Coord c, int button) {
		if (button != 1)
			return (false);
		if (!drag)
			return (false);
		drag = false;
		ui.grabmouse(null);
		return (true);
	}

	public void changed() {
	}

	public void ch(int a) {
		int val = this.val + a;
		if (val > max)
			val = max;
		if (val < min)
			val = min;
		this.val = val;
	}
}