package net.sf.launch4j.formimpl;
import java.awt.AWTEvent;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.event.AWTEventListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import javax.swing.JComponent;
import javax.swing.SwingUtilities;
/**
* This is the glass pane class that intercepts screen interactions during
* system busy states.
*
* Based on JavaWorld article by Yexin Chen.
*/
public class GlassPane extends JComponent implements AWTEventListener {
private final Window _window;
public GlassPane(Window w) {
_window = w;
addMouseListener(new MouseAdapter() {});
addKeyListener(new KeyAdapter() {});
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
}
/**
* Receives all key events in the AWT and processes the ones that originated
* from the current window with the glass pane.
*
* @param event
* the AWTEvent that was fired
*/
public void eventDispatched(AWTEvent event) {
Object source = event.getSource();
if (event instanceof KeyEvent
&& source instanceof Component) {
/*
* If the event originated from the window w/glass pane,
* consume the event.
*/
if ((SwingUtilities.windowForComponent((Component) source) == _window)) {
((KeyEvent) event).consume();
}
}
}
/**
* Sets the glass pane as visible or invisible. The mouse cursor will be set
* accordingly.
*/
public void setVisible(boolean visible) {
if (visible) {
// Start receiving all events and consume them if necessary
Toolkit.getDefaultToolkit().addAWTEventListener(this, AWTEvent.KEY_EVENT_MASK);
} else {
// Stop receiving all events
Toolkit.getDefaultToolkit().removeAWTEventListener(this);
}
super.setVisible(visible);
}
}