javax/swing/JFrame.java

/* JFrame.java --
   Copyright (C) 2002, 2004, 2005  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
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath 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 for more details.

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along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
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package javax.swing;

import java.awt.AWTEvent;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.LayoutManager;
import java.awt.event.KeyEvent;
import java.awt.event.WindowEvent;

import javax.accessibility.Accessible;
import javax.accessibility.AccessibleContext;

/**
 * A window that supports window decorations (titlebar and borders).
 * This is an extension of {@link java.awt.Frame} that provides support
 * for the Swing architecture. Most importantly it contains a {@link JRootPane}
 * as it's only top-level child, that manages the content pane, the menu and
 * a glass pane.
 *
 * Also, unlike <code>java.awt.Frame</code>s, JFrames support the
 * Swing Pluggable Look &amp; Feel architecture.
 *
 * @author Ronald Veldema (rveldema@cs.vu.nl)
 */
public class JFrame extends Frame
  implements WindowConstants, RootPaneContainer, Accessible
{
  /**
   * Provides accessibility support for <code>JFrame</code>s.
   */
  protected class AccessibleJFrame extends Frame.AccessibleAWTFrame
  {
    /**
     * Creates a new instance of <code>AccessibleJFrame</code>.
     */
    public AccessibleJFrame()
    {
      super();
      // Nothing to do here.
    }
  }

  /**
   * A flag for {@link #setDefaultCloseOperation(int)}, indicating that the
   * application should be exited, when this <code>JFrame</code> is closed.
   *
   * @since 1.3
   */
  public static final int EXIT_ON_CLOSE = 3;

  private static final long serialVersionUID = -3362141868504252139L;
  private static boolean defaultLookAndFeelDecorated;
  private int close_action = HIDE_ON_CLOSE;
  protected AccessibleContext accessibleContext;
  protected JRootPane rootPane;

  /**
   * @specnote rootPaneCheckingEnabled is false to comply with J2SE 5.0
   */
  protected boolean rootPaneCheckingEnabled = false;

  /**
   * Tells us if we're in the initialization stage.
   * If so, adds go to top-level Container, otherwise they go
   * to the content pane for this container.
   */
  private boolean initStageDone = false;

  public JFrame()
  {
    super("JFrame");
    frameInit();
  }

  public JFrame(String title)
  {
    super(title);
    frameInit();
  }

  /**
   * Creates a new JFrame in the specified {@link GraphicsConfiguration}
   * and with an empty title.
   *
   * @param gc the <code>GraphicsConfiguration</code> that is used for
   *     the new <code>JFrame</code>
   *
   * @see Frame#Frame(GraphicsConfiguration)
   */
  public JFrame(GraphicsConfiguration gc)
  {
    super(gc);
    frameInit();
  }

  /**
   * Creates a new JFrame in the specified {@link GraphicsConfiguration}
   * and with the specified title.
   *
   * @param title the title for the new <code>JFrame</code>
   * @param gc the <code>GraphicsConfiguration</code> that is used for
   *     the new <code>JFrame</code>
   *
   * @see Frame#Frame(String, GraphicsConfiguration)
   */
  public JFrame(String title, GraphicsConfiguration gc)
  {
    super(title, gc);
    frameInit();
  }

  protected void frameInit()
  {
    super.setLayout(new BorderLayout(1, 1));
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    getRootPane(); // will do set/create
    // We're now done the init stage.
    initStageDone = true;
  }

  public Dimension getPreferredSize()
  {
    return super.getPreferredSize();
  }

  public JMenuBar getJMenuBar()
  {
    return getRootPane().getJMenuBar();
  }

  public void setJMenuBar(JMenuBar menubar)
  {
    getRootPane().setJMenuBar(menubar);
  }

  public void setLayout(LayoutManager manager)
  {
    // Check if we're in initialization stage.  If so, call super.setLayout
    // otherwise, valid calls go to the content pane.
    if (initStageDone)
      {
        if (isRootPaneCheckingEnabled())
          throw new Error("Cannot set layout. Use getContentPane().setLayout()"
                           + " instead.");
        getContentPane().setLayout(manager);
      }
    else
      super.setLayout(manager);
  }

  public void setLayeredPane(JLayeredPane layeredPane)
  {
    getRootPane().setLayeredPane(layeredPane);
  }

  public JLayeredPane getLayeredPane()
  {
    return getRootPane().getLayeredPane();
  }

  public JRootPane getRootPane()
  {
    if (rootPane == null)
      setRootPane(createRootPane());
    return rootPane;
  }

  protected void setRootPane(JRootPane root)
  {
    if (rootPane != null)
      remove(rootPane);

    rootPane = root;
    add(rootPane, BorderLayout.CENTER);
  }

  protected JRootPane createRootPane()
  {
    return new JRootPane();
  }

  public Container getContentPane()
  {
    return getRootPane().getContentPane();
  }

  public void setContentPane(Container contentPane)
  {
    getRootPane().setContentPane(contentPane);
  }

  public Component getGlassPane()
  {
    return getRootPane().getGlassPane();
  }

  public void setGlassPane(Component glassPane)
  {
    getRootPane().setGlassPane(glassPane);
  }

  protected void addImpl(Component comp, Object constraints, int index)
  {
    // If we're adding in the initialization stage use super.add.
    // Otherwise pass the add onto the content pane.
    if (!initStageDone)
      super.addImpl(comp, constraints, index);
    else
      {
        if (isRootPaneCheckingEnabled())
          throw new Error("rootPaneChecking is enabled - adding components "
                           + "disallowed.");
        getContentPane().add(comp,constraints,index);
      }
  }

  public void remove(Component comp)
  {
    // If we're removing the root pane, use super.remove. Otherwise
    // pass it on to the content pane instead.
    if (comp==rootPane)
      super.remove(rootPane);
    else
      getContentPane().remove(comp);
  }

  protected boolean isRootPaneCheckingEnabled()
  {
    return rootPaneCheckingEnabled;
  }

  protected void setRootPaneCheckingEnabled(boolean enabled)
  {
    rootPaneCheckingEnabled = enabled;
  }

  public void update(Graphics g)
  {
    paint(g);
  }

  protected void processKeyEvent(KeyEvent e)
  {
    super.processKeyEvent(e);
  }

  public static void setDefaultLookAndFeelDecorated(boolean decorated)
  {
    defaultLookAndFeelDecorated = decorated;
  }

  public static boolean isDefaultLookAndFeelDecorated()
  {
    return defaultLookAndFeelDecorated;
  }

  public AccessibleContext getAccessibleContext()
  {
    if (accessibleContext == null)
      accessibleContext = new AccessibleJFrame();
    return accessibleContext;
  }

  public int getDefaultCloseOperation()
  {
    return close_action;
  }

  protected String paramString()
  {
    return "JFrame";
  }

  protected void processWindowEvent(WindowEvent e)
  {
    super.processWindowEvent(e);
    switch (e.getID())
      {
      case WindowEvent.WINDOW_CLOSING:
        {
	  switch (close_action)
	    {
	    case EXIT_ON_CLOSE:
	      {
		System.exit(0);
		break;
	      }
	    case DISPOSE_ON_CLOSE:
	      {
		dispose();
		break;
	      }
	    case HIDE_ON_CLOSE:
	      {
		setVisible(false);
		break;
	      }
	    case DO_NOTHING_ON_CLOSE:
	      break;
	    }
	  break;
        }
      case WindowEvent.WINDOW_CLOSED:
      case WindowEvent.WINDOW_OPENED:
      case WindowEvent.WINDOW_ICONIFIED:
      case WindowEvent.WINDOW_DEICONIFIED:
      case WindowEvent.WINDOW_ACTIVATED:
      case WindowEvent.WINDOW_DEACTIVATED:
	break;
      }
  }

  /**
   * Defines what happens when this frame is closed. Can be one off
   * <code>EXIT_ON_CLOSE</code>,
   * <code>DISPOSE_ON_CLOSE</code>,
   * <code>HIDE_ON_CLOSE</code> or
   * <code>DO_NOTHING_ON_CLOSE</code>.
   * The default is <code>HIDE_ON_CLOSE</code>.
   * When <code>EXIT_ON_CLOSE</code> is specified this method calls
   * <code>SecurityManager.checkExit(0)</code> which might throw a
   * <code>SecurityException</code>. When the specified operation is
   * not one of the above a <code>IllegalArgumentException</code> is
   * thrown.
   */
  public void setDefaultCloseOperation(int operation)
  {
    SecurityManager sm = System.getSecurityManager();
    if (sm != null && operation == EXIT_ON_CLOSE)
      sm.checkExit(0);

    if (operation != EXIT_ON_CLOSE && operation != DISPOSE_ON_CLOSE
        && operation != HIDE_ON_CLOSE && operation != DO_NOTHING_ON_CLOSE)
      throw new IllegalArgumentException("defaultCloseOperation must be EXIT_ON_CLOSE, HIDE_ON_CLOSE, DISPOSE_ON_CLOSE, or DO_NOTHING_ON_CLOSE");

    close_action = operation;
  }
}