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Groovy Swing Fix Button Click : Ensure a single click fires actionPerformed

/ Published in: Groovy
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  1. import java.awt.Toolkit;
  2. import java.awt.AWTEvent;
  3. import java.awt.event.AWTEventListener;
  4.  
  5. import java.awt.event.MouseListener;
  6. import java.awt.event.MouseAdapter;
  7. import java.awt.event.MouseEvent;
  8.  
  9. import javax.swing.SwingUtilities;
  10. import javax.swing.SwingUtilities as SU;
  11.  
  12. /*
  13. 	Laurence Toenjes 2011-03-13
  14.  
  15. 	This is a "crude" global JButton fix click solution, because:
  16.  
  17. 		Sometimes when using internal frames, it takes
  18. 		two clicks on a button to get the actionPerformed
  19. 		code to fire.
  20.  
  21. 	How to use (one call in app startup code):
  22. 		FixButtonClick.init()
  23. */
  24.  
  25. /*
  26. 	development settings to relax java security
  27.  
  28. 	file: ${user.home}/.java.policy
  29.  
  30. 		grant codeBase "file:///-" { permission java.security.AllPermission "java.security.AllPermission.*"; };
  31. 		grant codeBase "http://localhost/-" { permission java.security.AllPermission "java.security.AllPermission.*"; };
  32.  
  33. */
  34.  
  35. class FixButtonClick {
  36.  
  37. 	static private initialized = false;
  38.  
  39. 	static synchronized def fixButtonClick( aButton ) {
  40. 		def sKey = 'has_fixButtonClick';
  41. 		def getValue = {
  42. 			if ( aButton.getClientProperty( sKey ) == null)
  43. 				aButton.putClientProperty( sKey, false );
  44. 			aButton.getClientProperty( sKey )
  45. 		}
  46. 		def hasFix = getValue() == true;
  47. 		if (hasFix)
  48. 			return;
  49.  
  50. 		aButton.addMouseListener(
  51.  
  52. 			new MouseAdapter() {
  53. 				void	 mousePressed(MouseEvent e) {
  54. 					if ( e.source.hasFocus() == false ) {
  55. 						e.source.doClick()
  56. 					}
  57. 				}	// end mousePressed
  58. 			} 	// end MouseAdapter
  59.  
  60. 		);
  61.  
  62. 		aButton.putClientProperty( sKey, true );
  63. 	}
  64.  
  65. 	static synchronized def init() {
  66.  
  67. 		if ( FixButtonClick.initialized == true )
  68. 			return;
  69.  
  70. 		FixButtonClick.initialized = true;
  71.  
  72. 		// Global Event Listener
  73. 		def gel = new AWTEventListener() {
  74.  
  75. 			void eventDispatched(AWTEvent event) {
  76.  
  77. 				def isJButton    = event.source instanceof javax.swing.JButton;
  78. 				def isMouseEvent = event instanceof java.awt.event.MouseEvent;
  79.  
  80. 				if (isJButton && isMouseEvent) {
  81.  
  82. 					def MOUSE_EN   = java.awt.event.MouseEvent.MOUSE_ENTERED
  83. 					def isMouseEntered = event.getID() == MOUSE_EN;
  84.  
  85. 					if ( isMouseEntered ) {
  86.  
  87. 						def r = new Runnable() {
  88. 								public void run() {
  89. 									FixButtonClick.fixButtonClick( event.source );
  90. 								}
  91. 						};
  92.  
  93. 						if ( SU.isEventDispatchThread() ) {
  94. 							r.run();
  95. 						} 
  96. 						else {
  97. 							SU.invokeAndWait( r );
  98. 						}
  99.  
  100. 					} // isMouseEntered
  101.  
  102. 				} // isJButton && isMouseEvent
  103. 			}
  104. 		}
  105.  
  106. 		def tk = Toolkit.getDefaultToolkit();
  107. 		def long mask
  108. 		// mask = Long.MAX_VALUE; // all events
  109. 		mask = AWTEvent.MOUSE_EVENT_MASK;
  110. 		tk.addAWTEventListener( gel, mask as long );
  111.  
  112. 	} 	// end init
  113.  
  114. } 	// end class

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