More techniques and tips - JavaTech: An Introduction to Scientific and Technical Computing with Java - page 398

// Create the popup menu
makePopup ();
// Add the MouseAdapter that opens the popup.
canvas1.addMouseListener (fAdapter);
canvas2.addMouseListener (fAdapter);
} // ctor
/** Create the popup menu and a MouseAdapter that opens
*itwhenright button (or equivalent) is clicked.
**/
void makePopup () {
fColorMenu = new JPopupMenu ( " Color " );
fColorMenu.add (makeMenuItem ( " Red " ));
fColorMenu.add (makeMenuItem ( " Green " ));
fColorMenu.add (makeMenuItem ( " Blue " ));
// Create a MouseAdapter that creates a Popup menu
// when the right mouse or equivalent button clicked.
fAdapter = new MouseAdapter () {
// On some platforms, mouseReleased sets
// PopupTrigger.
public void mouseReleased (MouseEvent e) {
if (e.isPopupTrigger ()) {
showPopupMenu (e);
}
}
// And on other platforms, mousePressed sets
// PopupTrigger.
public void mousePressed (MouseEvent e) {
if (e.isPopupTrigger ()) {
showPopupMenu (e);
}
}
// Get the component over which the right button
// click occurred and show the menu there.
public void showPopupMenu (MouseEvent e) {
fSelectedComponent = e.getComponent ();
fColorMenu.show (fSelectedComponent,
e.getX (), e.getY ());
}
} ;//anonymous MouseAdapter subclass