package awtExtExamples ;
/*
 *
 * Copyright (c) 1995 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL purposes and without
 * fee is hereby granted provided that this copyright notice
 * appears in all copies. Please refer to the file "copyright.html"
 * for further important copyright and licensing information.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 */

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Event;

import awtExt.* ;
import sysExt.* ;

/**
 * A test of an awtExt.Scrollbar invoking user defined methods.
 * Each scrollbar has 1 callback method registered with it.
 * Note: JDK Beta-2 scrollbars are somewhat broken, so they
 * don't respond to repeat events. The next version of the JDk
 * Should fix this problem.
 */
public class ScrollbarTest extends Frame {
    Scrollbar vert;
    Scrollbar horz;
    ScrollablePaintCanvas cv;

    public ScrollbarTest() {
	super("ScrollbarTest");
	add("Center", cv = new ScrollablePaintCanvas());
	try {
	/*
	** Create the vertical and horizontal callbacks
	*/
	methodRef mrV = Callback.newRef( this, "vertScrollMethod" ) ;
	methodRef mrH = Callback.newRef( this, "horzScrollMethod" ) ;

	/*
	** Create the vertical and horizontal scrollbars.
	** Attach the callbacks to them.
	*/
	add("East", vert = new Scrollbar(Scrollbar.VERTICAL,
				cv.ty, 100, 0, ScrollablePaintCanvas.SIZE, mrV));
	add("South", horz = new Scrollbar(Scrollbar.HORIZONTAL,
				cv.tx, 100, 0, ScrollablePaintCanvas.SIZE, mrH));
	} catch( Exception e ) { e.printStackTrace();} ;
	reshape(100, 200, 300, 250);
	show();
    }

    /*
    ** Called back from vertical scrollbar
    */
    public void vertScrollMethod( CallbackInfo cbi ) {
	    System.out.println( "In V Scrollbar Callback..." );
	    cv.ty = ((Integer)cbi.evt.arg).intValue();
	    cv.repaint();

	}


    /*
    ** Called back from horizontal scrollbar
    */
    public void horzScrollMethod( CallbackInfo cbi ) {
	    System.out.println( "In H Scrollbar Callback...");
	    cv.tx = ((Integer)cbi.evt.arg).intValue();
	    cv.repaint();

	}


    public static void main(String args[]) {
	new ScrollbarTest();
    }
}

class ScrollablePaintCanvas extends Canvas {
    int tx = 20;
    int ty = 100;
    static final int SIZE = 500;

    public void paint(Graphics g) {
	g.translate(-tx, -ty);
	for (int i = 0 ; i < 200 ; i += 20) {
	    g.drawOval(i, i, SIZE - 2*i, SIZE - 2*i);
	}
	g.setColor(Color.yellow);
	g.drawLine(0, SIZE/2, SIZE, SIZE/2);
	g.drawLine(SIZE/2, 0, SIZE/2, SIZE);

	g.setColor(Color.red);
	g.fillOval(SIZE/2 - 20, SIZE/2 - 20, 40, 40);
    }
}