llvm-gcc-4.0/libjava/javax/swing/plaf/PopupMenuUI.java

/* 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
it under the terms of the GNU General Public License as published by
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02111-1307 USA.

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As a special exception, the copyright holders of this library give you
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()
  {
  }


  /**
   * 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);
  }
}