filelock/src/main/lib/launch4j-2.1.5-win32/src/net/sf/launch4j/formimpl/GlassPane.java

   1 package net.sf.launch4j.formimpl;\r
   2 \r
   3 import java.awt.AWTEvent;\r
   4 import java.awt.Component;\r
   5 import java.awt.Cursor;\r
   6 import java.awt.Toolkit;\r
   7 import java.awt.Window;\r
   8 import java.awt.event.AWTEventListener;\r
   9 import java.awt.event.KeyAdapter;\r
  10 import java.awt.event.KeyEvent;\r
  11 import java.awt.event.MouseAdapter;\r
  12 \r
  13 import javax.swing.JComponent;\r
  14 import javax.swing.SwingUtilities;\r
  15 \r
  16 /**\r
  17  * This is the glass pane class that intercepts screen interactions during\r
  18  * system busy states.\r
  19  * \r
  20  * Based on JavaWorld article by Yexin Chen.\r
  21  */\r
  22 public class GlassPane extends JComponent implements AWTEventListener {\r
  23         private final Window _window;\r
  24 \r
  25         public GlassPane(Window w) {\r
  26                 _window = w;\r
  27                 addMouseListener(new MouseAdapter() {});\r
  28                 addKeyListener(new KeyAdapter() {});\r
  29                 setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));\r
  30         }\r
  31 \r
  32         /**\r
  33          * Receives all key events in the AWT and processes the ones that originated\r
  34          * from the current window with the glass pane.\r
  35          * \r
  36          * @param event\r
  37          *            the AWTEvent that was fired\r
  38          */\r
  39         public void eventDispatched(AWTEvent event) {\r
  40                 Object source = event.getSource();\r
  41                 if (event instanceof KeyEvent\r
  42                                 && source instanceof Component) {\r
  43                         /*\r
  44                          * If the event originated from the window w/glass pane,\r
  45                          * consume the event.\r
  46                          */\r
  47                         if ((SwingUtilities.windowForComponent((Component) source) == _window)) {\r
  48                                 ((KeyEvent) event).consume();\r
  49                         }\r
  50                 }\r
  51         }\r
  52 \r
  53         /**\r
  54          * Sets the glass pane as visible or invisible. The mouse cursor will be set\r
  55          * accordingly.\r
  56          */\r
  57         public void setVisible(boolean visible) {\r
  58                 if (visible) {\r
  59                         // Start receiving all events and consume them if necessary\r
  60                         Toolkit.getDefaultToolkit().addAWTEventListener(this, AWTEvent.KEY_EVENT_MASK);\r
  61                 } else {\r
  62                         // Stop receiving all events\r
  63                         Toolkit.getDefaultToolkit().removeAWTEventListener(this);\r
  64                 }\r
  65                 super.setVisible(visible);\r
  66         }\r
  67 }\r