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