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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
*
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.excalibur.instrument.client;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.Toolkit;
import javax.swing.Action;
import javax.swing.JMenu;
import javax.swing.JPopupMenu;
/**
* The default JMenu class does not work correctly when the popup menu contains
* large numbers of elements.
*
* @author Avalon Development Team
* @version CVS $Revision: 1.4 $ $Date: 2004/02/28 11:47:23 $
* @since 4.1
*/
public class LargeMenu
extends JMenu
{
/*---------------------------------------------------------------
* Constructors
*-------------------------------------------------------------*/
/**
* Constructs a new JMenu with no text.
*/
public LargeMenu()
{
super();
}
/**
* Constructs a new JMenu with the supplied string
* as its text.
*
* @param s the text for the menu label
*/
public LargeMenu( String s )
{
super( s );
}
/**
* Constructs a menu whose properties are taken from the
* Action supplied.
* @param a an Action
*/
public LargeMenu( Action a )
{
super( a );
}
/**
* Constructs a new JMenu with the supplied string as
* its text and specified as a tear-off menu or not.
*
* @param s the text for the menu label
* @param b can the menu be torn off (not yet implemented)
*/
public LargeMenu( String s, boolean b )
{
super( s, b );
}
/*---------------------------------------------------------------
* JMenu Methods
*-------------------------------------------------------------*/
/**
* Computes the origin for the JMenu's popup menu.
*
* Code is copied from JDK1.3 source, but has been patched.
*
* @return a Point in the coordinate space of the
* menu which should be used as the origin
* of the JMenu's popup menu
*/
protected Point getPopupMenuOrigin()
{
int x = 0;
int y = 0;
JPopupMenu pm = getPopupMenu();
// Figure out the sizes needed to caclulate the menu position
Dimension screenSize =Toolkit.getDefaultToolkit().getScreenSize();
Dimension s = getSize();
Dimension pmSize = pm.getSize();
// For the first time the menu is popped up,
// the size has not yet been initiated
if (pmSize.width==0)
{
pmSize = pm.getPreferredSize();
}
Point position = getLocationOnScreen();
Container parent = getParent();
if (parent instanceof JPopupMenu)
{
// We are a submenu (pull-right)
// Can not call SwingUtilities.isLeftToRight(this) from here, so assume true.
// First determine x:
if (position.x+s.width + pmSize.width < screenSize.width)
{
x = s.width; // Prefer placement to the right
}
else
{
x = 0-pmSize.width; // Otherwise place to the left
}
// Then the y:
if (position.y+pmSize.height < screenSize.height)
{
y = 0; // Prefer dropping down
}
else
{
// ****************
// This code was patched.
// ****************
// Old Code:
// y = s.height-pmSize.height; // Otherwise drop 'up'
// New Code:
if ( position.y + s.height - pmSize.height >= 0 )
{
// Fits in the screen when dripped up.
y = s.height - pmSize.height;
}
else
{
// Does not fit, so show it starting at the top of the screen.
// This is an offset.
y = 0 - position.y;
}
}
} else {
// We are a toplevel menu (pull-down)
// Can not call SwingUtilities.isLeftToRight(this) from here, so assume true.
// First determine the x:
if (position.x+pmSize.width < screenSize.width) {
x = 0; // Prefer extending to right
} else {
x = s.width-pmSize.width; // Otherwise extend to left
}
// Then the y:
if (position.y+s.height+pmSize.height < screenSize.height) {
y = s.height; // Prefer dropping down
} else {
// ****************
// This code was patched.
// ****************
// Old Code:
//y = 0-pmSize.height; // Otherwise drop 'up'
// New Code:
if ( position.y - pmSize.height >= 0 )
{
// Fits in the screen when dripped up.
y = 0 - pmSize.height;
}
else
{
// Does not fit, so show it starting at the top of the screen.
// This is an offset.
y = 0 - position.y;
}
}
}
return new Point(x,y);
}
}