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Rubber Band on AWT/Swing Component

/ Published in: Java
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  1. import java.awt.Component;
  2. import java.awt.Rectangle;
  3. import java.awt.event.MouseAdapter;
  4. import java.awt.event.MouseEvent;
  5. import java.awt.event.MouseMotionAdapter;
  6. import java.util.ArrayList;
  7. import java.util.Iterator;
  8. import java.util.List;
  9.  
  10. public class RubberBand {
  11.  
  12.     private Rectangle rectangle;
  13.     private final List rubberBandListeners = new ArrayList();
  14.     private final Component component;
  15.     private int maxWidth;
  16.     private int maxHeight;
  17.  
  18.     public RubberBand(Component component) {
  19. 	this.component = component;
  20. 	addListeners();
  21.     }
  22.  
  23.     private void addListeners() {
  24. 	component.addMouseMotionListener(new MouseMotionAdapter() {
  25. 	    public void mouseDragged(MouseEvent event) {
  26. 		reactOnMouseDragged(event);
  27. 	    }
  28. 	});
  29. 	component.addMouseListener(new MouseAdapter() {
  30. 	    public void mousePressed(MouseEvent event) {
  31. 		reactOnMousePressed(event);
  32. 	    }
  33.  
  34. 	    public void mouseClicked(MouseEvent event) {
  35. 		reactOnMouseClicked();
  36. 	    }
  37. 	});
  38.     }
  39.  
  40.     public int getX() {
  41. 	return rectangle.width >= 0 ? rectangle.x : (rectangle.x + rectangle.width);
  42.     }
  43.  
  44.     public int getY() {
  45. 	return rectangle.height >= 0 ? rectangle.y : (rectangle.y + rectangle.height);
  46.     }
  47.  
  48.     public int getWidth() {
  49. 	return Math.abs(rectangle.width);
  50.     }
  51.  
  52.     public int getHeight() {
  53. 	return Math.abs(rectangle.height);
  54.     }
  55.  
  56.     public void addRubberBandListener(Runnable rubberBandListener) {
  57. 	rubberBandListeners.add(rubberBandListener);
  58.     }
  59.  
  60.     public void notifyRubberBandListeners() {
  61. 	Iterator iterator = rubberBandListeners.iterator();
  62. 	while (iterator.hasNext()) {
  63. 	    ((Runnable)iterator.next()).run();
  64. 	}
  65.     }
  66.  
  67.     public void kill() {
  68. 	rectangle = null;
  69. 	notifyRubberBandListeners();
  70.     }
  71.  
  72.     private void reactOnMouseDragged(MouseEvent event) {
  73. 	if (rectangle == null) createRubberBand(0,0);
  74. 	int x = Math.min(event.getX(), maxWidth-1);
  75. 	x = Math.max(0, x);
  76. 	int y = Math.min(event.getY(), maxHeight-1);
  77. 	y = Math.max(0, y);
  78. 	rectangle.width = x - rectangle.x;
  79. 	rectangle.height = y - rectangle.y;
  80. 	notifyRubberBandListeners();
  81.     }
  82.  
  83.     private void createRubberBand(int x, int y) {
  84. 	rectangle = new Rectangle(x, y, 0, 0);
  85.     }
  86.  
  87.     private void reactOnMousePressed(MouseEvent event) {
  88. 	createRubberBand(event.getX(), event.getY());
  89. 	notifyRubberBandListeners();
  90.     }
  91.  
  92.     private void reactOnMouseClicked() {
  93. 	kill();
  94.     }
  95.  
  96.     public boolean isActive() {
  97. 	return rectangle != null;
  98.     }
  99.  
  100.  
  101.     public void setMaxBounds(int width, int height) {
  102. 	this.maxWidth = width;
  103. 	this.maxHeight = height;
  104.     }
  105.  
  106. }

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