/*
 * Copyright (c) 2008, Piccolo2D project, http://piccolo2d.org
 * Copyright (c) 1998-2008, University of Maryland
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions
 * and the following disclaimer in the documentation and/or other materials provided with the
 * distribution.
 *
 * None of the name of the University of Maryland, the name of the Piccolo2D project, or the names of its
 * contributors may be used to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package edu.umd.cs.piccolox.swt;

import java.awt.Color;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.util.List;

import org.eclipse.swt.SWT;

import edu.umd.cs.piccolo.PCamera;
import edu.umd.cs.piccolo.PNode;
import edu.umd.cs.piccolo.event.PInputEvent;
import edu.umd.cs.piccolo.util.PBounds;
import edu.umd.cs.piccolo.util.PPaintContext;
import edu.umd.cs.piccolox.event.PSelectionEventHandler;

/**
 * Modified to use SWT paths instead of normal paths
 * 
 * @version 1.0
 * @author Lance Good
 */
public class PSWTSelectionEventHandler extends PSelectionEventHandler {

    PSWTPath marquee;
    PNode marqueeParent;
    Point2D pressPt;
    Point2D canvasPressPt;

    /**
     * Creates a selection event handler.
     * 
     * @param marqueeParent The node to which the event handler dynamically adds
     *            a marquee (temporarily) to represent the area being selected.
     * @param selectableParent The node whose children will be selected by this
     *            event handler.
     */
    public PSWTSelectionEventHandler(PNode marqueeParent, PNode selectableParent) {
        super(new PNode(), selectableParent);
        this.marqueeParent = marqueeParent;
    }

    /**
     * Creates a selection event handler.
     * 
     * @param marqueeParent The node to which the event handler dynamically adds
     *            a marquee (temporarily) to represent the area being selected.
     * @param selectableParents A list of nodes whose children will be selected
     *            by this event handler.
     */
    public PSWTSelectionEventHandler(PNode marqueeParent, List selectableParents) {
        super(new PNode(), selectableParents);
        this.marqueeParent = marqueeParent;
    }

    public void decorateSelectedNode(PNode node) {
        PSWTBoundsHandle.addBoundsHandlesTo(node);
    }

    public void undecorateSelectedNode(PNode node) {
        PSWTBoundsHandle.removeBoundsHandlesFrom(node);
    }

    protected void initializeSelection(PInputEvent pie) {
        super.initializeSelection(pie);
        pressPt = pie.getPosition();
        canvasPressPt = pie.getCanvasPosition();
    }

    protected void initializeMarquee(PInputEvent e) {
        super.initializeMarquee(e);

        marquee = new PSWTPath(new Rectangle2D.Float((float) pressPt.getX(), (float) pressPt.getY(), 0, 0)) {
            protected void paint(PPaintContext paintContext) {
                SWTGraphics2D s2g = (SWTGraphics2D) paintContext.getGraphics();
                s2g.gc.setLineStyle(SWT.LINE_DASH);
                super.paint(paintContext);
                s2g.gc.setLineStyle(SWT.LINE_SOLID);
            }
        };
        marquee.setStrokeColor(Color.black);
        marquee.setPaint(null);
        marqueeParent.addChild(marquee);
    }

    protected void updateMarquee(PInputEvent pie) {
        super.updateMarquee(pie);

        PBounds b = new PBounds();

        if (marqueeParent instanceof PCamera) {
            b.add(canvasPressPt);
            b.add(pie.getCanvasPosition());
        }
        else {
            b.add(pressPt);
            b.add(pie.getPosition());
        }

        marquee.setPathToRectangle((float) b.x, (float) b.y, (float) b.width, (float) b.height);
        b.reset();
        b.add(pressPt);
        b.add(pie.getPosition());
    }

    protected PBounds getMarqueeBounds() {
        if (marquee != null) {
            return marquee.getBounds();
        }
        return new PBounds();
    }

    protected void endMarqueeSelection(PInputEvent e) {
        super.endMarqueeSelection(e);

        // Remove marquee
        marquee.removeFromParent();
        marquee = null;
    }

    /**
     * This gets called continuously during the drag, and is used to animate the
     * marquee
     */
    protected void dragActivityStep(PInputEvent aEvent) {
    }
}