Mega Code Archive
Provide a pop-up menu using a Frame
<![CDATA[
/*
* Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
* cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
* pioneering role in inventing and promulgating (and standardizing) the Java
* language and environment is gratefully acknowledged.
*
* The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
* inventing predecessor languages C and C++ is also gratefully acknowledged.
*/
import java.awt.AWTEvent;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.MenuItem;
import java.awt.PopupMenu;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
/**
* Provide a pop-up menu using a Frame. On most platforms, changing the mouse
* "settings" changes how the isPopupTrigger() method behaves instantly - which
* is as it should be!
*/
public class PopupDemo extends Frame {
/** "main" method - for testing. */
public static void main(String[] av) {
new PopupDemo("Hello").setVisible(true);
}
/** Construct the main program */
public PopupDemo(String title) {
super(title);
setLayout(new FlowLayout());
add(new PopupContainer("Hello, and welcome to the world of Java"));
pack();
setVisible(true);
}
}
/*
* A component to demonstrate use of PopupMenu. The user has to ask for the menu
* to popup in Java's platform-dependant way (e.g., right mouse click on X
* Windows, MS-Windows).
*
* Alternately, you could watch for keypress events and provide your own
* platform-independant keyboard popup menu character such as M for Menu (not
* CTRL/M; Mac's don't have a CTRL key).
*/
class PopupContainer extends Component {
PopupMenu m;
PopupContainer(String s) {
m = new PopupMenu(s);
m.add(new MenuItem("Open"));
m.add(new MenuItem("Close"));
MenuItem qB;
m.add(qB = new MenuItem("Exit"));
class Quitter implements ActionListener {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
}
qB.addActionListener(new Quitter());
add(m); // add Popup to Component
enableEvents(AWTEvent.MOUSE_EVENT_MASK);
}
public void processMouseEvent(MouseEvent me) {
System.err.println("MouseEvent: " + me);
if (me.isPopupTrigger())
m.show(this, me.getX(), me.getY());
else
super.processMouseEvent(me);
};
/** Compute our minimum size */
public Dimension getMinimumSize() {
return new Dimension(200, 200);
}
final int PREF_PAD = 10;
/** Computer our best size */
public Dimension getPreferredSize() {
Dimension d = getMinimumSize();
return new Dimension(d.width + PREF_PAD, d.height + PREF_PAD);
}
/** Computer our maximum allowed size */
public Dimension getMaximumSize() {
Dimension d = getMinimumSize();
return new Dimension(d.width * 2, d.height * 2);
}
}
]]>