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118 lines
3.8 KiB
Java
118 lines
3.8 KiB
Java
/* PopupMenuUI.java --
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Copyright (C) 2002, 2003, 2004 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;
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import java.awt.event.MouseEvent;
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import javax.swing.JPopupMenu;
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import javax.swing.Popup;
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import javax.swing.PopupFactory;
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/**
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* An abstract base class for delegates that implement the pluggable
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* look and feel for a <code>JPopupMenu</code>.
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*
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* @see javax.swing.JPopupMenu
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*
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* @author Andrew Selkirk (aselkirk@sympatico.ca)
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* @author Sascha Brawer (brawer@dandelis.ch)
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*/
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public abstract class PopupMenuUI extends ComponentUI
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{
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/**
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* Constructs a new <code>PopupMenuUI</code>.
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*/
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public PopupMenuUI()
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{
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// Nothing to do here.
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}
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/**
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* Tests whether or not a mouse event triggers a popup menu.
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*
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* <p>The default implementation calls
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* <code>event.isPopupTrigger()</code>, which checks for the gesture
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* that is common for the platform on which the application runs. If
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* a look and feel wants to employ non-standard conventions for
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* triggering a popup menu, it can override this method.
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*
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* @param event the event to check.
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*
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* @return <code>true</code> if the event triggers a popup menu;
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* <code>false</code> otherwise.
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*
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* @since 1.3
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*/
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public boolean isPopupTrigger(MouseEvent event)
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{
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return event.isPopupTrigger();
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}
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/**
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* Creates a <code>Popup</code> for displaying the popup menu. The
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* default implementation uses the {@link javax.swing.PopupFactory}
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* for retrieving a suitable <code>Popup</code>, but subclasses
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* might want to override this method if a LookAndFeel needs special
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* Popups.
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*
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* @param popup the <code>JPopupMenu</code> for whose display
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* a <code>Popup</code> is needed.
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*
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* @param x the horizontal position where the popup will be
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* displayed.
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*
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* @param y the vertical position where the popup will be
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* displayed.
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*
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* @return a <code>Popup</code> for showing and hiding
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* the menu.
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*
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* @since 1.4
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*/
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public Popup getPopup(JPopupMenu popup, int x, int y)
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{
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return PopupFactory.getSharedInstance().getPopup(
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/* origin/owner of the popup */ popup.getInvoker(),
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/* contents */ popup,
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x, y);
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}
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}
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