source: trunk/gcc/libjava/java/awt/Window.java@ 3148

/* Window.java --
   Copyright (C) 1999, 2000, 2002 Free Software Foundation

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.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 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
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */


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 ([email protected])
 * @author Warren Levy  <[email protected]>
 */
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.
   *
   * @exception IllegalArgumentException If the owner's GraphicsConfiguration
   * is not from a screen device, or if owner is null; this exception is always
   * thrown when GraphicsEnvironment.isHeadless returns true.
   */
  public Window(Frame owner)
  {
    this (owner, owner.getGraphicsConfiguration ());
  }

  /**
   * Initializes a new instance of <code>Window</code> with the specified
   * parent.  The window will initially be invisible.   
   *
   * @exception IllegalArgumentException If the owner's GraphicsConfiguration
   * is not from a screen device, or if owner is null; this exception is always
   * thrown when GraphicsEnvironment.isHeadless returns true.
   *
   * @since 1.2
   */
  public Window(Window owner)
  {
    this (owner, owner.getGraphicsConfiguration ());
  }
  
  /**
   * Initializes a new instance of <code>Window</code> with the specified
   * parent.  The window will initially be invisible.   
   *
   * @exception IllegalArgumentException If owner is null or if gc is not from a
   * screen device; this exception is always thrown when
   * GraphicsEnvironment.isHeadless returns true.
   *
   * @since 1.3
   */
  public Window(Window owner, GraphicsConfiguration gc)
  {
    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
    
    /*  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();
  }

  /**
   * Disposes of the input methods and context, and removes the WeakReference
   * which formerly pointed to this Window from the parent's owned Window list.
   *
   * @exception Throwable The Exception raised by this method.
   */
  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 (parent != null && !parent.isDisplayable())
      parent.addNotify();
    if (peer == null)
      addNotify();

    validate();
    super.show();
    toFront();
  }

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

  public boolean isDisplayable()
  {
    if (super.isDisplayable())
      return true;
    return peer != null;
  }

  /**
   * 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()
  {