import java.awt.Component;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class RubberBand {

    private Rectangle rectangle;
    private final List rubberBandListeners = new ArrayList();
    private final Component component;
    private int maxWidth;
    private int maxHeight;

    public RubberBand(Component component) {
	this.component = component;
	addListeners();
    }
    
    private void addListeners() {
	component.addMouseMotionListener(new MouseMotionAdapter() {
	    public void mouseDragged(MouseEvent event) {
		reactOnMouseDragged(event);
	    }
	});
	component.addMouseListener(new MouseAdapter() {
	    public void mousePressed(MouseEvent event) {
		reactOnMousePressed(event);
	    }

	    public void mouseClicked(MouseEvent event) {
		reactOnMouseClicked();
	    }
	});
    }
    
    public int getX() {
	return rectangle.width >= 0 ? rectangle.x : (rectangle.x + rectangle.width);
    }

    public int getY() {
	return rectangle.height >= 0 ? rectangle.y : (rectangle.y + rectangle.height);
    }
    
    public int getWidth() {
	return Math.abs(rectangle.width);
    }
    
    public int getHeight() {
	return Math.abs(rectangle.height);
    }
    
    public void addRubberBandListener(Runnable rubberBandListener) {
	rubberBandListeners.add(rubberBandListener);
    }

    public void notifyRubberBandListeners() {
	Iterator iterator = rubberBandListeners.iterator();
	while (iterator.hasNext()) {
	    ((Runnable)iterator.next()).run();
	}
    }

    public void kill() {
	rectangle = null;
	notifyRubberBandListeners();
    }
    
    private void reactOnMouseDragged(MouseEvent event) {
	if (rectangle == null) createRubberBand(0,0);
	int x = Math.min(event.getX(), maxWidth-1);
	x = Math.max(0, x);
	int y = Math.min(event.getY(), maxHeight-1);
	y = Math.max(0, y);
	rectangle.width = x - rectangle.x;
	rectangle.height = y - rectangle.y;
	notifyRubberBandListeners();
    }
    
    private void createRubberBand(int x, int y) {
	rectangle = new Rectangle(x, y, 0, 0);
    }

    private void reactOnMousePressed(MouseEvent event) {
	createRubberBand(event.getX(), event.getY());
	notifyRubberBandListeners();
    }

    private void reactOnMouseClicked() {
	kill();
    }

    public boolean isActive() {
	return rectangle != null;
    }


    public void setMaxBounds(int width, int height) {
	this.maxWidth = width;
	this.maxHeight = height;
    }
    
}

package com.clipboard2web.t.awtutil;

import java.awt.Component;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class RubberBand {

    private Rectangle rectangle;
    private final List rubberBandListeners = new ArrayList();
    private final Component component;
    private int maxWidth;
    private int maxHeight;

    public RubberBand(Component component) {
	this.component = component;
	addListeners();
    }
    
    private void addListeners() {
	component.addMouseMotionListener(new MouseMotionAdapter() {
	    public void mouseDragged(MouseEvent event) {
		reactOnMouseDragged(event);
	    }
	});
	component.addMouseListener(new MouseAdapter() {
	    public void mousePressed(MouseEvent event) {
		reactOnMousePressed(event);
	    }

	    public void mouseClicked(MouseEvent event) {
		reactOnMouseClicked();
	    }
	});
    }
    
    public int getX() {
	return rectangle.width >= 0 ? rectangle.x : (rectangle.x + rectangle.width);
    }

    public int getY() {
	return rectangle.height >= 0 ? rectangle.y : (rectangle.y + rectangle.height);
    }
    
    public int getWidth() {
	return Math.abs(rectangle.width);
    }
    
    public int getHeight() {
	return Math.abs(rectangle.height);
    }
    
    public void addRubberBandListener(Runnable rubberBandListener) {
	rubberBandListeners.add(rubberBandListener);
    }

    public void notifyRubberBandListeners() {
	Iterator iterator = rubberBandListeners.iterator();
	while (iterator.hasNext()) {
	    ((Runnable)iterator.next()).run();
	}
    }

    public void kill() {
	rectangle = null;
	notifyRubberBandListeners();
    }
    
    private void reactOnMouseDragged(MouseEvent event) {
	if (rectangle == null) createRubberBand(0,0);
	int x = Math.min(event.getX(), maxWidth-1);
	x = Math.max(0, x);
	int y = Math.min(event.getY(), maxHeight-1);
	y = Math.max(0, y);
	rectangle.width = x - rectangle.x;
	rectangle.height = y - rectangle.y;
	notifyRubberBandListeners();
    }
    
    private void createRubberBand(int x, int y) {
	rectangle = new Rectangle(x, y, 0, 0);
    }

    private void reactOnMousePressed(MouseEvent event) {
	createRubberBand(event.getX(), event.getY());
	notifyRubberBandListeners();
    }

    private void reactOnMouseClicked() {
	kill();
    }

    public boolean isActive() {
	return rectangle != null;
    }


    public void setMaxBounds(int width, int height) {
	this.maxWidth = width;
	this.maxHeight = height;
    }
    
}

Rubber Band on AWT/Swing Component

image

Java