

TarTool example source code file (JFCUtilities.java)
The TarTool JFCUtilities.java source code/* ** Tim Endres' utilities package. ** Copyright (c) 1997 by Tim Endres ** ** This program is free software. ** ** You may redistribute it and/or modify it under the terms of the GNU ** General Public License as published by the Free Software Foundation. ** Version 2 of the license should be included with this distribution in ** the file LICENSE, as well as License.html. If the license is not ** included with this distribution, you may find a copy at the FSF web ** site at 'www.gnu.org' or 'www.fsf.org', or you may write to the ** Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139 USA. ** ** THIS SOFTWARE IS PROVIDED ASIS WITHOUT WARRANTY OF ANY KIND, ** NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR ** OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY ** CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR ** REDISTRIBUTION OF THIS SOFTWARE. ** */ package com.ice.util; import java.awt.Component; import java.awt.Dimension; import java.awt.Point; import java.awt.Toolkit; import java.awt.event.MouseEvent; import javax.swing.JPopupMenu; /** * This is a class that contains useful utility functions related * to the JFC (Swing). */ public class JFCUtilities { /** * Swing 1.0 and 1.1 have a horrible bug with respect to popup menus. * Namely that they are not adjusted to be kept onscreen. * Here, we ensure that the popup is properly located. * This method will continue to work even after Sun fixes Swing... * However, because there is a case where we estimate the size of * the popup menu, one could make the argument to noop this method * when the bug is finally fixed. */ static public Point computePopupLocation( MouseEvent event, Component rel, JPopupMenu popup ) { Dimension psz = popup.getSize(); Dimension ssz = Toolkit.getDefaultToolkit().getScreenSize(); Point gLoc = rel.getLocationOnScreen(); Point result = new Point( event.getX(), event.getY() ); gLoc.x += event.getX(); gLoc.y += event.getY(); if ( psz.width == 0  psz.height == 0 ) { // DRAT! Now we need to "estimate"... int items = popup.getSubElements().length; psz.height = ( items * 22 ); psz.width = 100; } psz.height += 5; if ( (gLoc.x + psz.width) > ssz.width ) { result.x = (( gLoc.x + psz.width)  ssz.width); if ( (gLoc.x + result.x) < 0 ) result.x = (gLoc.x + event.getX()); } if ( (gLoc.y + psz.height) > ssz.height ) { result.y = (( gLoc.y + psz.height)  ssz.height); if ( (gLoc.y + result.y) < 0 ) result.y = gLoc.y; } return result; } } Other TarTool examples (source code examples)Here is a short list of links related to this TarTool JFCUtilities.java source code file: 
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