VerticalDragBar.java

/**
 * Copyright (c) Lambda Innovation, 2013-2015
 * 本作品版权由Lambda Innovation所有。
 * http://www.li-dev.cn/
 *
 * This project is open-source, and it is distributed under  
 * the terms of GNU General Public License. You can modify
 * and distribute freely as long as you follow the license.
 * 本项目是一个开源项目，且遵循GNU通用公共授权协议。
 * 在遵照该协议的情况下，您可以自由传播和修改。
 * http://www.gnu.org/licenses/gpl.html
 */
package cn.liutils.cgui.gui.component;

import cn.liutils.cgui.gui.Widget;
import cn.liutils.cgui.gui.event.DragEvent;
import cn.liutils.cgui.gui.event.DragEvent.DragEventHandler;
import cn.liutils.cgui.gui.event.GuiEvent;
import cn.liutils.cgui.gui.event.GuiEventHandler;

/**
 * @author WeAthFolD
 *
 */
public class VerticalDragBar extends Component {
    
    public double y0, y1;

    public VerticalDragBar() {
        super("VerticalDragBar");
        
        this.addEventHandler(new DragEventHandler() {

            @Override
            public void handleEvent(Widget w, DragEvent event) {
                double originalX = w.transform.x;
                w.getGui().updateDragWidget();
                w.transform.x = originalX;
                w.getGui().updateWidget(w);
                
                if(w.transform.y > y1) {
                    w.transform.y = y1;
                } else if(w.transform.y < y0) {
                    w.transform.y = y0;
                }
                w.postEvent(new DraggedEvent());
                w.dirty = true;
            }
            
        });
    }
    
    public static VerticalDragBar get(Widget w) {
        return w.getComponent("VerticalDragBar");
    }
    
    public double getProgress() {
        return (widget.transform.y - y0) / (y1 - y0);
    }
    
    public void setProgress(Widget w, double prg) {
        w.transform.y = y0 + (y1 - y0) * prg;
        w.dirty = true;
    }
    
    public VerticalDragBar setArea(double _y0,  double _y1) {
        y0 = _y0;
        y1 = _y1;
        
        return this;
    }
    
    public static class DraggedEvent implements GuiEvent {}

    public abstract static class DraggedHandler extends GuiEventHandler<DraggedEvent> {

        public DraggedHandler() {
            super(DraggedEvent.class);
        }
        
    }
}