ojluni/src/main/java/com/sun/java/swing/plaf/motif/MotifPopupMenuUI.java

/*
 * Copyright (c) 1997, 2005, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
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package com.sun.java.swing.plaf.motif;

import sun.swing.SwingUtilities2;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.BasicPopupMenuUI;


/**
 * A Motif L&F implementation of PopupMenuUI.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases.  The current serialization support is appropriate
 * for short term storage or RMI between applications running the same
 * version of Swing.  A future release of Swing will provide support for
 * long term persistence.
 *
 * @author Georges Saab
 * @author Rich Schiavi
 */
public class MotifPopupMenuUI extends BasicPopupMenuUI {
    private static Border border = null;
    private Font titleFont = null;

    public static ComponentUI createUI(JComponent x) {
        return new MotifPopupMenuUI();
    }

    /* This has to deal with the fact that the title may be wider than
       the widest child component.
       */
    public Dimension getPreferredSize(JComponent c) {
        LayoutManager layout = c.getLayout();
        Dimension d = layout.preferredLayoutSize(c);
        String title = ((JPopupMenu)c).getLabel();
        if (titleFont == null) {
            UIDefaults table = UIManager.getLookAndFeelDefaults();
            titleFont = table.getFont("PopupMenu.font");
        }
        FontMetrics fm = c.getFontMetrics(titleFont);
        int         stringWidth = 0;

        if (title!=null) {
            stringWidth += SwingUtilities2.stringWidth(c, fm, title);
        }

        if (d.width < stringWidth) {
            d.width = stringWidth + 8;
            Insets i = c.getInsets();
            if (i!=null) {
                d.width += i.left + i.right;
            }
            if (border != null) {
                i = border.getBorderInsets(c);
                d.width += i.left + i.right;
            }

            return d;
        }
        return null;
    }

    protected ChangeListener createChangeListener(JPopupMenu m) {
        return new ChangeListener() {
            public void stateChanged(ChangeEvent e) {}
        };
    }

    public boolean isPopupTrigger(MouseEvent e) {
        return ((e.getID()==MouseEvent.MOUSE_PRESSED)
                && ((e.getModifiers() & MouseEvent.BUTTON3_MASK)!=0));
    }
}