/*
 * File    : Resizer.java
 * Created : 08-mai-2003 14:42
 * By      : fbusquets
 *
 * JClic - Authoring and playing system for educational activities
 *
 * Copyright (C) 2000 - 2005 Francesc Busquets & Departament
 * d'Educacio de la Generalitat de Catalunya
 *
 * 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 (see the LICENSE file).
 */

package edu.xtec.util;

import java.awt.event.*;
import javax.swing.JComponent;
import java.awt.Rectangle;
import java.awt.Cursor;
import java.awt.Point;
import edu.xtec.jclic.Constants;
import java.awt.Dimension;

/**
 *
 * @author Francesc Busquets (fbusquets@xtec.net)
 * @version 1.0
 */
public class Resizer implements MouseListener, MouseMotionListener{
    
    JComponent jc;
    Rectangle r;
    Cursor defaultCursor;
    boolean doGetBounds;
    boolean dragging;
    boolean dragCursorX, dragCursorY;
    ResizerListener rl;
    Dimension minSize;
    Dimension maxSize;
    boolean editable;
    boolean enabled;
    
    public static final int MARGIN=5;
    
    /** Creates a new instance of Resizer */
    public Resizer(JComponent jc, Rectangle r, boolean editable, ResizerListener rl) {
        this.jc=jc;
        setRect(r);
        this.editable=editable;
        if(editable)
            defaultCursor=Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
        this.rl=rl;
        jc.addMouseListener(this);
        jc.addMouseMotionListener(this);
        minSize=new Dimension(Constants.MIN_CELL_SIZE, Constants.MIN_CELL_SIZE);
        maxSize=new Dimension(jc.getPreferredSize());
        setEnabled(true);
    }
    
    public void setEnabled(boolean enabled){
        this.enabled=enabled;
        jc.setCursor(defaultCursor);
    }
    
    public boolean getEnabled(){
        return enabled;
    }
    
    public void setMinSize(Dimension d){
        minSize=d;
    }
    
    public void setMaxSize(Dimension d){
        maxSize=d;
    }
    
    public void setRect(Rectangle r){
        this.r=r;
        doGetBounds=(r==null);
        if(doGetBounds)
            r=jc.getBounds();
    }
    
    public void mouseClicked(MouseEvent mouseEvent) {
        if(enabled && editable && rl!=null && r.contains(mouseEvent.getPoint())){
            rl.editObject(r, jc, mouseEvent.getPoint());
        }
    }
    
    public void mouseDragged(MouseEvent mouseEvent) {
        if(enabled && dragging)
            resizeByDrag(mouseEvent.getPoint());
    }
    
    public void mouseEntered(MouseEvent mouseEvent) {
    }
    
    public void mouseExited(MouseEvent mouseEvent) {
    }
    
    public void mouseMoved(MouseEvent mouseEvent) {
        if(!dragging && enabled){
            Point p=mouseEvent.getPoint();
            Cursor newCursor=defaultCursor;
            if(doGetBounds)
                r=jc.getBounds();
            dragCursorX=Math.abs(p.x-r.x-r.width)<MARGIN && p.y>=r.y && p.y<(r.y+r.height+MARGIN);
            dragCursorY=Math.abs(p.y-r.y-r.height)<MARGIN && p.x>=r.x && p.x<(r.x+r.width+MARGIN);
            if(dragCursorX && dragCursorY)
                newCursor=Cursor.getPredefinedCursor(Cursor.NW_RESIZE_CURSOR);
            else if(dragCursorY)
                newCursor=Cursor.getPredefinedCursor(Cursor.N_RESIZE_CURSOR);
            else if(dragCursorX)
                newCursor=Cursor.getPredefinedCursor(Cursor.E_RESIZE_CURSOR);
            jc.setCursor(newCursor);
        }
        else if(dragging)
            mouseDragged(mouseEvent);
    }
    
    public void mousePressed(MouseEvent mouseEvent) {
        if(enabled && (dragCursorX || dragCursorY)){
            dragging=true;
            resizeByDrag(mouseEvent.getPoint());
        }
    }
    
    public void mouseReleased(MouseEvent mouseEvent) {
        if(enabled && dragging){
            resizeByDrag(mouseEvent.getPoint());
            dragging=false;
        }
    }
    
    private void resizeByDrag(Point p){
        int w=r.width;
        int h=r.height;
        if(dragCursorX)
            w=Math.min(maxSize.width, Math.max(minSize.width, p.x-r.x));
        if(dragCursorY)
            h=Math.min(maxSize.height, Math.max(minSize.height, p.y-r.y));        
        r=new Rectangle(r.x, r.y, w, h);
        if(rl!=null)
            rl.resizeObjectTo(r, jc);
    }
    
    public JComponent getComponent(){
        return jc;
    }
    
    public interface ResizerListener{
        public void resizeObjectTo(Rectangle r, JComponent jc);
        public void editObject(Rectangle r, JComponent jc, Point pt);
    }
    
}