674 lines
21 KiB
Java
674 lines
21 KiB
Java
/* BasicPopupMenuUI.java
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Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.swing.plaf.basic;
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import java.awt.AWTEvent;
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import java.awt.Component;
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import java.awt.Container;
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import java.awt.Cursor;
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import java.awt.Dimension;
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import java.awt.Point;
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import java.awt.event.ComponentEvent;
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import java.awt.event.ComponentListener;
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import java.awt.event.MouseEvent;
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import javax.swing.BoxLayout;
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import javax.swing.JComponent;
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import javax.swing.JLayeredPane;
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import javax.swing.JMenu;
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import javax.swing.JMenuItem;
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import javax.swing.JPopupMenu;
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import javax.swing.MenuElement;
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import javax.swing.MenuSelectionManager;
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import javax.swing.RootPaneContainer;
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import javax.swing.SwingUtilities;
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import javax.swing.UIDefaults;
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import javax.swing.UIManager;
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import javax.swing.event.MouseInputListener;
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import javax.swing.event.PopupMenuEvent;
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import javax.swing.event.PopupMenuListener;
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import javax.swing.plaf.ComponentUI;
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import javax.swing.plaf.PopupMenuUI;
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/**
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* UI Delegate for JPopupMenu
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*/
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public class BasicPopupMenuUI extends PopupMenuUI
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{
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/* popupMenu for which this UI delegate is for*/
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protected JPopupMenu popupMenu;
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/* MouseInputListener listens to mouse events. Package private for inner classes. */
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static transient MouseInputListener mouseInputListener;
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/* PopupMenuListener listens to popup menu events fired by JPopupMenu*/
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private transient PopupMenuListener popupMenuListener;
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/* ComponentListener listening to popupMenu's invoker.
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* This is package-private to avoid an accessor method. */
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TopWindowListener topWindowListener;
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/**
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* Creates a new BasicPopupMenuUI object.
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*/
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public BasicPopupMenuUI()
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{
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popupMenuListener = new PopupMenuHandler();
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topWindowListener = new TopWindowListener();
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}
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/**
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* Factory method to create a BasicPopupMenuUI for the given {@link
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* JComponent}, which should be a {@link JMenuItem}.
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*
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* @param x The {@link JComponent} a UI is being created for.
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*
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* @return A BasicPopupMenuUI for the {@link JComponent}.
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*/
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public static ComponentUI createUI(JComponent x)
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{
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return new BasicPopupMenuUI();
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}
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/**
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* Installs and initializes all fields for this UI delegate. Any properties
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* of the UI that need to be initialized and/or set to defaults will be
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* done now. It will also install any listeners necessary.
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*
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* @param c The {@link JComponent} that is having this UI installed.
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*/
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public void installUI(JComponent c)
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{
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super.installUI(c);
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popupMenu = (JPopupMenu) c;
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popupMenu.setLayout(new DefaultMenuLayout(popupMenu, BoxLayout.Y_AXIS));
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popupMenu.setBorderPainted(true);
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JPopupMenu.setDefaultLightWeightPopupEnabled(true);
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installDefaults();
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installListeners();
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}
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/**
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* This method installs the defaults that are defined in the Basic look
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* and feel for this {@link JPopupMenu}.
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*/
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public void installDefaults()
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{
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UIDefaults defaults = UIManager.getLookAndFeelDefaults();
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popupMenu.setBackground(defaults.getColor("PopupMenu.background"));
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popupMenu.setBorder(defaults.getBorder("PopupMenu.border"));
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popupMenu.setFont(defaults.getFont("PopupMenu.font"));
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popupMenu.setForeground(defaults.getColor("PopupMenu.foreground"));
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popupMenu.setOpaque(true);
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}
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/**
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* This method installs the listeners for the {@link JMenuItem}.
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*/
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protected void installListeners()
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{
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popupMenu.addPopupMenuListener(popupMenuListener);
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}
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/**
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* This method installs the keyboard actions for this {@link JPopupMenu}.
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*/
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protected void installKeyboardActions()
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{
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// FIXME: Need to implement
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}
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/**
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* Performs the opposite of installUI. Any properties or resources that need
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* to be cleaned up will be done now. It will also uninstall any listeners
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* it has. In addition, any properties of this UI will be nulled.
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*
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* @param c The {@link JComponent} that is having this UI uninstalled.
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*/
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public void uninstallUI(JComponent c)
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{
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uninstallListeners();
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uninstallDefaults();
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popupMenu = null;
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}
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/**
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* This method uninstalls the defaults and sets any objects created during
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* install to null
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*/
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protected void uninstallDefaults()
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{
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popupMenu.setBackground(null);
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popupMenu.setBorder(null);
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popupMenu.setFont(null);
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popupMenu.setForeground(null);
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}
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/**
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* Unregisters all the listeners that this UI delegate was using.
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*/
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protected void uninstallListeners()
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{
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popupMenu.removePopupMenuListener(popupMenuListener);
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}
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/**
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* Uninstalls any keyboard actions.
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*/
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protected void uninstallKeyboardActions()
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{
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// FIXME: Need to implement
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}
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/**
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* This method returns the minimum size of the JPopupMenu.
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*
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* @param c The JComponent to find a size for.
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*
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* @return The minimum size.
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*/
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public Dimension getMinimumSize(JComponent c)
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{
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return null;
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}
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/**
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* This method returns the preferred size of the JPopupMenu.
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*
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* @param c The JComponent to find a size for.
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*
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* @return The preferred size.
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*/
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public Dimension getPreferredSize(JComponent c)
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{
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return null;
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}
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/**
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* This method returns the minimum size of the JPopupMenu.
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*
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* @param c The JComponent to find a size for.
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*
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* @return The minimum size.
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*/
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public Dimension getMaximumSize(JComponent c)
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{
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return null;
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}
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/**
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* Return true if given mouse event is a platform popup trigger, and false
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* otherwise
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*
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* @param e MouseEvent that is to be checked for popup trigger event
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*
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* @return true if given mouse event is a platform popup trigger, and false
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* otherwise
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*/
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public boolean isPopupTrigger(MouseEvent e)
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{
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return false;
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}
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/**
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* This listener handles PopupMenuEvents fired by JPopupMenu
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*/
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private class PopupMenuHandler implements PopupMenuListener
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{
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/**
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* This method is invoked when JPopupMenu is cancelled.
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*
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* @param event the PopupMenuEvent
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*/
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public void popupMenuCanceled(PopupMenuEvent event)
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{
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MenuSelectionManager manager = MenuSelectionManager.defaultManager();
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manager.clearSelectedPath();
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}
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/**
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* This method is invoked when JPopupMenu becomes invisible
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*
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* @param event the PopupMenuEvent
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*/
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public void popupMenuWillBecomeInvisible(PopupMenuEvent event)
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{
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// remove listener that listens to component events fired
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// by the top - level window that this popup belongs to.
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Component invoker = popupMenu.getInvoker();
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RootPaneContainer rootContainer = (RootPaneContainer) SwingUtilities
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.getRoot(invoker);
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((Container) rootContainer).removeComponentListener(topWindowListener);
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// If this popup menu is the last popup menu visible on the screen, then
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// stop interrupting mouse events in the glass pane before hiding this
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// last popup menu.
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boolean topLevelMenu = (popupMenu.getInvoker() instanceof JMenu)
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&& ((JMenu) popupMenu.getInvoker())
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.isTopLevelMenu();
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if (topLevelMenu || ! (popupMenu.getInvoker() instanceof MenuElement))
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{
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// set glass pane not to interrupt mouse events and remove
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// mouseInputListener
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Container glassPane = (Container) rootContainer.getGlassPane();
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glassPane.setVisible(false);
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glassPane.removeMouseListener(mouseInputListener);
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mouseInputListener = null;
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}
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}
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/**
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* This method is invoked when JPopupMenu becomes visible
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*
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* @param event the PopupMenuEvent
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*/
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public void popupMenuWillBecomeVisible(PopupMenuEvent event)
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{
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// Adds topWindowListener to top-level window to listener to
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// ComponentEvents fired by it. We need to cancel this popup menu
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// if topWindow to which this popup belongs was resized or moved.
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Component invoker = popupMenu.getInvoker();
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RootPaneContainer rootContainer = (RootPaneContainer) SwingUtilities
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.getRoot(invoker);
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((Container) rootContainer).addComponentListener(topWindowListener);
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// Set the glass pane to interrupt all mouse events originating in root
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// container
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if (mouseInputListener == null)
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{
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Container glassPane = (Container) rootContainer.getGlassPane();
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glassPane.setVisible(true);
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mouseInputListener = new MouseInputHandler(rootContainer);
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glassPane.addMouseListener(mouseInputListener);
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glassPane.addMouseMotionListener(mouseInputListener);
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}
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// if this popup menu is a free floating popup menu,
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// then by default its first element should be always selected when
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// this popup menu becomes visible.
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MenuSelectionManager manager = MenuSelectionManager.defaultManager();
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if (manager.getSelectedPath().length == 0)
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{
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// Set selected path to point to the first item in the popup menu
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MenuElement[] path = new MenuElement[2];
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path[0] = popupMenu;
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Component[] comps = popupMenu.getComponents();
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if (comps.length != 0 && comps[0] instanceof MenuElement)
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{
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path[1] = (MenuElement) comps[0];
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manager.setSelectedPath(path);
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}
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}
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}
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}
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/**
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* ComponentListener that listens to Component Events fired by the top -
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* level window to which popup menu belongs. If top-level window was
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* resized, moved or hidded then popup menu will be hidded and selected
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* path of current menu hierarchy will be set to null.
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*/
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private class TopWindowListener implements ComponentListener
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{
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/**
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* This method is invoked when top-level window is resized. This method
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* closes current menu hierarchy.
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*
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* @param e The ComponentEvent
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*/
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public void componentResized(ComponentEvent e)
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{
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MenuSelectionManager manager = MenuSelectionManager.defaultManager();
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manager.clearSelectedPath();
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}
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/**
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* This method is invoked when top-level window is moved. This method
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* closes current menu hierarchy.
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*
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* @param e The ComponentEvent
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*/
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public void componentMoved(ComponentEvent e)
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{
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MenuSelectionManager manager = MenuSelectionManager.defaultManager();
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manager.clearSelectedPath();
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}
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/**
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* This method is invoked when top-level window is shown This method
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* does nothing by default.
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*
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* @param e The ComponentEvent
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*/
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public void componentShown(ComponentEvent e)
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{
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MenuSelectionManager manager = MenuSelectionManager.defaultManager();
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manager.clearSelectedPath();
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}
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/**
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* This method is invoked when top-level window is hidden This method
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* closes current menu hierarchy.
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*
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* @param e The ComponentEvent
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*/
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public void componentHidden(ComponentEvent e)
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{
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MenuSelectionManager manager = MenuSelectionManager.defaultManager();
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manager.clearSelectedPath();
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}
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}
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/**
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* MouseInputHandler listens to all mouse events originated in the root
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* container. This class is responsible for closing menu hierarchy when the
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* user presses mouse over any component that do not belong to the current
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* menu hierarchy. This is acomplished by interrupting all mouse event in
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* the glass pane and checking if other component was pressed while menu
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* was open, before redestributing events further to intended components
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*/
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private class MouseInputHandler implements MouseInputListener
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{
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private JLayeredPane layeredPane;
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private Container glassPane;
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private Cursor nativeCursor;
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private transient Component mouseEventTarget;
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private transient Component pressedComponent;
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private transient Component lastComponentEntered;
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private transient Component tempComponent;
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private transient int pressCount;
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/**
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* Creates a new MouseInputHandler object.
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*
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* @param c the top most root container
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*/
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public MouseInputHandler(RootPaneContainer c)
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{
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layeredPane = c.getLayeredPane();
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glassPane = (Container) c.getGlassPane();
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}
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/**
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* Handles mouse clicked event
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*
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* @param e Mouse event
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*/
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public void mouseClicked(MouseEvent e)
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{
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handleEvent(e);
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}
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/**
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* Handles mouseDragged event
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*
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* @param e MouseEvent
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*/
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public void mouseDragged(MouseEvent e)
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{
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handleEvent(e);
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}
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/**
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* Handles mouseEntered event
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*
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* @param e MouseEvent
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*/
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public void mouseEntered(MouseEvent e)
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{
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handleEvent(e);
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}
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/**
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* Handles mouseExited event
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*
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* @param e MouseEvent
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*/
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public void mouseExited(MouseEvent e)
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{
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handleEvent(e);
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}
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/**
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* Handles mouse moved event
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*
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* @param e MouseEvent
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*/
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public void mouseMoved(MouseEvent e)
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{
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handleEvent(e);
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}
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/**
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* Handles mouse pressed event
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*
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* @param e MouseEvent
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*/
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public void mousePressed(MouseEvent e)
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{
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handleEvent(e);
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}
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/**
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* Handles mouse released event
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*
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* @param e MouseEvent
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*/
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public void mouseReleased(MouseEvent e)
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{
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handleEvent(e);
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}
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/*
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* This method determines component that was intended to received mouse
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* event, before it was interrupted within the glass pane. This method
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* also redispatches mouse entered and mouse exited events to the
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* appropriate components. This code is slightly modified code from
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* Container.LightweightDispatcher class, which is private inside
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* Container class and cannot be used here.
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*/
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public void acquireComponentForMouseEvent(MouseEvent me)
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{
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int x = me.getX();
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int y = me.getY();
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// Find the candidate which should receive this event.
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Component parent = layeredPane;
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Component candidate = null;
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Point p = me.getPoint();
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while ((candidate == null) && (parent != null))
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{
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p = SwingUtilities.convertPoint(glassPane, p.x, p.y, parent);
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candidate = SwingUtilities.getDeepestComponentAt(parent, p.x, p.y);
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if (candidate == null)
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{
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p = SwingUtilities.convertPoint(parent, p.x, p.y,
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parent.getParent());
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parent = parent.getParent();
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}
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}
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// If the only candidate we found was the native container itself,
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// don't dispatch any event at all. We only care about the lightweight
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// children here.
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if (candidate == layeredPane)
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candidate = null;
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// If our candidate is new, inform the old target we're leaving.
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if ((lastComponentEntered != null) && lastComponentEntered.isShowing()
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&& (lastComponentEntered != candidate))
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{
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// Old candidate could have been removed from
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// the layeredPane so we check first.
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if (SwingUtilities.isDescendingFrom(lastComponentEntered, layeredPane))
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{
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Point tp = SwingUtilities.convertPoint(layeredPane, x, y,
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lastComponentEntered);
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MouseEvent exited = new MouseEvent(lastComponentEntered,
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MouseEvent.MOUSE_EXITED,
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me.getWhen(),
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me.getModifiersEx(), tp.x,
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tp.y, me.getClickCount(),
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me.isPopupTrigger(),
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me.getButton());
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tempComponent = lastComponentEntered;
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lastComponentEntered = null;
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tempComponent.dispatchEvent(exited);
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}
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lastComponentEntered = null;
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}
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// If we have a candidate, maybe enter it.
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if (candidate != null)
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{
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mouseEventTarget = candidate;
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if (candidate.isLightweight() && candidate.isShowing()
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&& (candidate != layeredPane)
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&& (candidate != lastComponentEntered))
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{
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lastComponentEntered = mouseEventTarget;
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Point cp = SwingUtilities.convertPoint(layeredPane, x, y,
|
|
lastComponentEntered);
|
|
MouseEvent entered = new MouseEvent(lastComponentEntered,
|
|
MouseEvent.MOUSE_ENTERED,
|
|
me.getWhen(),
|
|
me.getModifiersEx(), cp.x,
|
|
cp.y, me.getClickCount(),
|
|
me.isPopupTrigger(),
|
|
me.getButton());
|
|
lastComponentEntered.dispatchEvent(entered);
|
|
}
|
|
}
|
|
|
|
if ((me.getID() == MouseEvent.MOUSE_RELEASED)
|
|
|| ((me.getID() == MouseEvent.MOUSE_PRESSED) && (pressCount > 0))
|
|
|| (me.getID() == MouseEvent.MOUSE_DRAGGED))
|
|
{
|
|
// If any of the following events occur while a button is held down,
|
|
// they should be dispatched to the same component to which the
|
|
// original MOUSE_PRESSED event was dispatched:
|
|
// - MOUSE_RELEASED
|
|
// - MOUSE_PRESSED: another button pressed while the first is held down
|
|
// - MOUSE_DRAGGED
|
|
if (SwingUtilities.isDescendingFrom(pressedComponent, layeredPane))
|
|
mouseEventTarget = pressedComponent;
|
|
else if (me.getID() == MouseEvent.MOUSE_CLICKED)
|
|
{
|
|
// Don't dispatch CLICKED events whose target is not the same as the
|
|
// target for the original PRESSED event.
|
|
if (candidate != pressedComponent)
|
|
mouseEventTarget = null;
|
|
else if (pressCount == 0)
|
|
pressedComponent = null;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This method handles mouse events interrupted by glassPane. It
|
|
* redispatches the mouse events appropriately to the intended components.
|
|
* The code in this method is also taken from
|
|
* Container.LightweightDispatcher class. The code is slightly modified
|
|
* to handle the case when mouse is released over non-menu component. In
|
|
* this case this method closes current menu hierarchy before
|
|
* redispatching the event further.
|
|
*/
|
|
public void handleEvent(AWTEvent e)
|
|
{
|
|
if (e instanceof MouseEvent)
|
|
{
|
|
MouseEvent me = (MouseEvent) e;
|
|
|
|
acquireComponentForMouseEvent(me);
|
|
|
|
// Avoid dispatching ENTERED and EXITED events twice.
|
|
if (mouseEventTarget != null && mouseEventTarget.isShowing()
|
|
&& (e.getID() != MouseEvent.MOUSE_ENTERED)
|
|
&& (e.getID() != MouseEvent.MOUSE_EXITED))
|
|
{
|
|
MouseEvent newEvt = SwingUtilities.convertMouseEvent(glassPane,
|
|
me,
|
|
mouseEventTarget);
|
|
|
|
mouseEventTarget.dispatchEvent(newEvt);
|
|
|
|
// If mouse was clicked over the component that is not part
|
|
// of menu hierarchy,then must close the menu hierarchy */
|
|
if (e.getID() == MouseEvent.MOUSE_RELEASED)
|
|
{
|
|
boolean partOfMenuHierarchy = false;
|
|
MenuSelectionManager manager = MenuSelectionManager
|
|
.defaultManager();
|
|
|
|
partOfMenuHierarchy = manager.isComponentPartOfCurrentMenu(mouseEventTarget);
|
|
|
|
if (! partOfMenuHierarchy)
|
|
manager.clearSelectedPath();
|
|
}
|
|
|
|
switch (e.getID())
|
|
{
|
|
case MouseEvent.MOUSE_PRESSED:
|
|
if (pressCount++ == 0)
|
|
pressedComponent = mouseEventTarget;
|
|
break;
|
|
case MouseEvent.MOUSE_RELEASED:
|
|
// Clear our memory of the original PRESSED event, only if
|
|
// we're not expecting a CLICKED event after this. If
|
|
// there is a CLICKED event after this, it will do clean up.
|
|
if ((--pressCount == 0)
|
|
&& (mouseEventTarget != pressedComponent))
|
|
pressedComponent = null;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|