private void prepareGUI() {
frame = new JFrame("Control Sample");
frame.setSize(600, 480);
frame.setLayout(new GridLayout(3, 1));
headerLabel = new JLabel("", JLabel.CENTER);
statusLabel = new JLabel("", JLabel.CENTER);
frame.addWindowFocusListener(
new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent) {
System.exit(0);
}
});
controlPanel = new JPanel();
controlPanel.setLayout(new FlowLayout());
frame.add(headerLabel);
frame.add(statusLabel);
frame.add(controlPanel);
}
/** Initialiser. */
private void init() {
invokePopupButton = new JToggleButton("Show popup");
invokePopupButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
// set popup window visibility
if (!popupWindow.isVisible()) {
// set location relative to button
Point location = invokePopupButton.getLocation();
SwingUtilities.convertPointToScreen(location, invokePopupButton.getParent());
location.translate(
0,
invokePopupButton.getHeight()
+ (invokePopupButton.getBorder() == null
? 0
: invokePopupButton
.getBorder()
.getBorderInsets(invokePopupButton)
.bottom));
popupWindow.setLocation(location);
// show the popup if not visible
invokePopupButton.setText("Hide popup");
popupWindow.setVisible(true);
popupWindow.requestFocus();
} else {
// hide it otherwise
invokePopupButton.setText("Show popup");
popupWindow.setVisible(false);
}
}
});
// add components to main panel
this.setLayout(new BorderLayout());
this.add(invokePopupButton, BorderLayout.CENTER);
// use frame
popupWindow = new JFrame();
popupWindow.setUndecorated(true);
popupWindow.addWindowFocusListener(
new WindowFocusListener() {
public void windowGainedFocus(WindowEvent e) {}
public void windowLostFocus(WindowEvent e) {
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
if (popupWindow.isVisible()) invokePopupButton.doClick();
}
});
}
});
// add some components to window
popupWindow.getContentPane().setLayout(new BorderLayout());
((JComponent) popupWindow.getContentPane()).setBorder(BorderFactory.createEtchedBorder());
JTextField aTextField = new JTextField(10);
popupWindow.getContentPane().add(new JLabel("Text:"), BorderLayout.WEST);
popupWindow.getContentPane().add(aTextField);
popupWindow.pack();
}