libjava/java/awt/Window.java

/* Copyright (C) 1999, 2000, 2002  Free Software Foundation

   Copyright (C) 1999 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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02111-1307 USA.

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making a combined work based on this library.  Thus, the terms and
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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
executable, regardless of the license terms of these independent
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package java.awt;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.awt.peer.WindowPeer;
import java.awt.peer.ComponentPeer;
import java.util.EventListener;
import java.util.Locale;
import java.util.ResourceBundle;

/**
 * This class represents a top-level window with no decorations.
 *
 * @author Aaron M. Renn (arenn@urbanophile.com)
 * @author Warren Levy  <warrenl@cygnus.com>
 */
public class Window extends Container
{
  // Serialized fields, from Sun's serialization spec.
  // private FocusManager focusMgr;  // FIXME: what is this?  
  private String warningString = null;
  private int state = 0;
  private int windowSerializedDataVersion = 0; // FIXME

  private transient WindowListener windowListener;
  private transient GraphicsConfiguration graphicsConfiguration;

  /** 
   * This (package access) constructor is used by subclasses that want
   * to build windows that do not have parents.  Eg. toplevel
   * application frames.  Subclasses cannot call super(null), since
   * null is an illegal argument.
   */
  Window()
  {
    setVisible(false);
    setLayout((LayoutManager) new BorderLayout());
  }

  Window(GraphicsConfiguration gc)
  {
    this();
    graphicsConfiguration = gc;
  }
    
  /**
   * Initializes a new instance of <code>Window</code> with the specified
   * parent.  The window will initially be invisible.
   *
   * @param parent The owning <code>Frame</code> of this window.
   */
  public Window(Frame owner)
  {
    this((Window) owner);
  }

  /** @since 1.2 */
  public Window(Window owner)
  {
    this();
    if (owner == null)
      throw new IllegalArgumentException("owner must not be null");
    
    this.parent = owner;

    // FIXME: add to owner's "owned window" list
    //owner.owned.add(this); // this should be a weak reference
  }
  
  /** @since 1.3 */
  public Window(Window owner, GraphicsConfiguration gc)
  {
    this(owner);

    /*  FIXME: Security check
    SecurityManager.checkTopLevelWindow(...)

    if (gc != null
        && gc.getDevice().getType() != GraphicsDevice.TYPE_RASTER_SCREEN)
      throw new IllegalArgumentException ("gc must be from a screen device");

    if (gc == null)
      graphicsConfiguration = GraphicsEnvironment.getLocalGraphicsEnvironment()
			     .getDefaultScreenDevice()
			     .getDefaultConfiguration();
    else
    */    
    graphicsConfiguration = gc;
  }

  GraphicsConfiguration getGraphicsConfigurationImpl()
  {
    if (graphicsConfiguration != null)
	return graphicsConfiguration;

    return super.getGraphicsConfigurationImpl();
  }

  protected void finalize() throws Throwable
  {
    // FIXME: remove from owner's "owned window" list (Weak References)
    super.finalize();
  }

  /**
   * Creates the native peer for this window.
   */
  public void addNotify()
  {
    if (peer == null)
      peer = getToolkit ().createWindow (this);
    super.addNotify ();
  }

  /**
   * Relays out this window's child components at their preferred size.
   *
   * @specnote pack() doesn't appear to be called internally by show(), so
   *             we duplicate some of the functionality.
   */
  public void pack()
  {
    if (parent != null
        && !parent.isDisplayable())
      parent.addNotify();
    if (peer == null)
      addNotify();

    setSize(getPreferredSize());
    
    validate();
  }

  /**
   * Makes this window visible and brings it to the front.
   */
  public void show ()
  {
    if (peer == null)
      addNotify();

    super.show();
    toFront();
  }

  public void hide()
  {
    // FIXME: call hide() on amy "owned" children here.
    super.hide();
  }

  /**
   * Called to free any resource associated with this window.
   */
  public void dispose()
  {
    hide();

    Window[] list = getOwnedWindows();
    for (int i=0; i<list.length; i++)
      list[i].dispose();

    for (int i = 0; i < ncomponents; ++i)
      component[i].removeNotify();
    this.removeNotify();
  }

  /**
   * Sends this window to the back so that all other windows display in
   * front of it.
   */
  public void toBack ()
  {
    if (peer != null)
      {
	WindowPeer wp = (WindowPeer) peer;
	wp.toBack ();
      }
  }

  /**
   * Brings this window to the front so that it displays in front of
   * any other windows.
   */
  public void toFront ()
  {
    if (peer != null)
      {
	WindowPeer wp = (WindowPeer) peer;
	wp.toFront ();
      }
  }

  /**
   * Returns the toolkit used to create this window.
   *
   * @return The toolkit used to create this window.
   *
   * @specnote Unlike Component.getToolkit, this implementation always 
   *           returns the value of Toolkit.getDefaultToolkit().
   */
  public Toolkit getToolkit()
  {
    return Toolkit.getDefaultToolkit ();    
  }

  /**
   * Returns the warning string that will be displayed if this window is
   * popped up by an unsecure applet or application.
   *
   * @return The unsecure window warning message.
   */
  public final String getWarningString()
  {
    boolean secure = true;
    /* boolean secure = SecurityManager.checkTopLevelWindow(...) */

    if (!secure)
      {
        if (warningString != null)
	  return warningString;
	else
	  {
	    String warning = System.getProperty("awt.appletWarning");
	    return warning;
	  }
      }
    return null;
  }

  /**
   * Returns the locale that this window is configured for.
   *
   * @return The locale this window is configured for.
   */
  public Locale getLocale ()
  {
    return locale == null ? Locale.getDefault () : locale;
  }

  /*
  /** @since 1.2
  public InputContext getInputContext()
  {
    // FIXME
  }
  */

  /**
   * Sets the cursor for this window to the specifiec cursor.
   *
   * @param cursor The new cursor for this window.
   */
  public void setCursor(Cursor cursor)
  {
    super.setCursor(cursor);
  }

  public Window getOwner()
  {
    return (Window) parent;
  }

  /** @since 1.2 */
  public Window[] getOwnedWindows()
  {
    // FIXME: return array containing all the windows this window currently 
    // owns.
    return new Window[0];
  }

  /**
   * Adds the specified listener to the list of <code>WindowListeners</code>
   * that will receive events for this window.
   *
   * @param listener The <code>WindowListener</code> to add.
   */
  public synchronized void addWindowListener (WindowListener listener)
  {
    windowListener = AWTEventMulticaster.add (windowListener, listener);
  }

  /**
   * Removes the specified listener from the list of
   * <code>WindowListeners</code> that will receive events for this window.
   *
   * @param listener The <code>WindowListener</code> to remove.
   */
  public synchronized void removeWindowListener (WindowListener listener)
  {
    windowListener = AWTEventMulticaster.remove (windowListener, listener);
  }

  /** @since 1.3 */
  public EventListener[] getListeners(Class listenerType)
  {
    if (listenerType == WindowListener.class)
      return getListenersImpl(listenerType, windowListener);
    else return super.getListeners(listenerType);
  }

  void dispatchEventImpl(AWTEvent e)
  {
    // Make use of event id's in order to avoid multiple instanceof tests.
    if (e.id <= WindowEvent.WINDOW_LAST 
        && e.id >= WindowEvent.WINDOW_FIRST
        && (windowListener != null 
	    || (eventMask & AWTEvent.WINDOW_EVENT_MASK) != 0))
      processEvent(e);
    else
      super.dispatchEventImpl(e);
  }

  /**
   * Processes the specified event for this window.  If the event is an
   * instance of <code>WindowEvent</code>, then
   * <code>processWindowEvent()</code> is called to process the event,
   * otherwise the superclass version of this method is invoked.
   *
   * @param event The event to process.
   */
  protected void processEvent (AWTEvent evt)
  {
    if (evt instanceof WindowEvent)
      processWindowEvent ((WindowEvent) evt);
    else
      super.processEvent (evt);
  }

  /**
   * Dispatches this event to any listeners that are listening for
   * <code>WindowEvents</code> on this window.  This method only gets
   * invoked if it is enabled via <code>enableEvents()</code> or if
   * a listener has been added.
   *
   * @param event The event to process.
   */
  protected void processWindowEvent (WindowEvent evt)
  {
    if (windowListener != null)
      {
	switch (evt.getID ())
	  {
	  case WindowEvent.WINDOW_ACTIVATED:
	    windowListener.windowActivated (evt);
	    break;
	  case WindowEvent.WINDOW_CLOSED:
	    windowListener.windowClosed (evt);
	    break;
	  case WindowEvent.WINDOW_CLOSING:
	    windowListener.windowClosing (evt);
	    break;
	  case WindowEvent.WINDOW_DEACTIVATED:
	    windowListener.windowDeactivated (evt);
	    break;
	  case WindowEvent.WINDOW_DEICONIFIED:
	    windowListener.windowDeiconified (evt);
	    break;
	  case WindowEvent.WINDOW_ICONIFIED:
	    windowListener.windowIconified (evt);
	    break;
	  case WindowEvent.WINDOW_OPENED:
	    windowListener.windowOpened (evt);
	    break;
	  }
      }
  }

  /**
   * Returns the child window that has focus if this window is active.
   * This method returns <code>null</code> if this window is not active
   * or no children have focus.
   *
   * @return The component that has focus, or <code>null</code> if no
   * component has focus.
   */
  public Component getFocusOwner()
  {
    // FIXME
    return null;
  }

  /**
   * Post a Java 1.0 event to the event queue.
   *
   * @param event The event to post.
   */
  public boolean postEvent(Event e)
  {
    // FIXME
    return false;
  }

  /**
   * Tests whether or not this window is visible on the screen.
   *
   * @return <code>true</code> if this window is visible, <code>false</code>
   * otherwise.
   */
  public boolean isShowing()
  {
    return super.isShowing();
  }

  /** @since 1.2 */
  public void applyResourceBundle(ResourceBundle rb)
  {
    // FIXME
  }

  /** @since 1.2 */
  public void applyResourceBundle(String rbName)
  {
    ResourceBundle rb = ResourceBundle.getBundle(rbName);
    if (rb != null)
      applyResourceBundle(rb);    
  }

  /*
  public AccessibleContext getAccessibleContext()
  {
    // FIXME
  }
  */

  /** 
   * Get graphics configuration.  The implementation for Window will
   * not ask any parent containers, since Window is a toplevel
   * window and not actually embedded in the parent component.
   */
  public GraphicsConfiguration getGraphicsConfiguration()
  {
    if (graphicsConfiguration != null) return graphicsConfiguration;
    if (peer != null) return peer.getGraphicsConfiguration();
    return null;
  }

}