frame.java

来自「linux下建立JAVA虚拟机的源码KAFFE」· Java 代码 · 共 651 行 · 第 1/2 页

   *
   * @param menuBar the new menu bar for this frame
   */
  public synchronized void setMenuBar(MenuBar menuBar)
  {
    if (this.menuBar != null)
      remove(this.menuBar);

    this.menuBar = menuBar;
    if (menuBar != null)
      {
	MenuContainer parent = menuBar.getParent();
	if (parent != null)
	  parent.remove(menuBar);
	menuBar.setParent(this);

	if (peer != null)
	  {
	    if (menuBar != null)
	      menuBar.addNotify();
	    invalidateTree();
	    ((FramePeer) peer).setMenuBar(menuBar);
	  }
      }
  }

  /**
   * Tests whether or not this frame is resizable.  This will be 
   * <code>true</code> by default.
   *
   * @return <code>true</code> if this frame is resizable, <code>false</code>
   *         otherwise
   */
  public boolean isResizable()
  {
    return resizable;
  }

  /**
   * Sets the resizability of this frame to the specified value.
   *
   * @param resizable <code>true</code> to make the frame resizable,
   * <code>false</code> to make it non-resizable
   */
  public synchronized void setResizable(boolean resizable)
  {
    this.resizable = resizable;
    if (peer != null)
      ((FramePeer) peer).setResizable(resizable);
  }

  /**
   * Returns the cursor type of the cursor for this window.  This will
   * be one of the constants in this class.
   *
   * @return the cursor type for this frame
   *
   * @deprecated Use <code>Component.getCursor()</code> instead.
   */
  public int getCursorType()
  {
    return getCursor().getType();
  }

  /**
   * Sets the cursor for this window to the specified type.  The specified
   * type should be one of the constants in this class.
   *
   * @param type the cursor type
   *
   * @deprecated Use <code>Component.setCursor(Cursor)</code> instead.
   */
  public void setCursor(int type)
  {
    setCursor(new Cursor(type));
  }

  /**
   * Removes the specified menu component from this frame. If it is
   * the current MenuBar it is removed from the frame. If it is a
   * Popup it is removed from this component. If it is any other menu
   * component it is ignored.
   *
   * @param menu the menu component to remove
   */
  public void remove(MenuComponent menu)
  {
    if (menu == menuBar)
      {
	if (menuBar != null)
	  {
	    if (peer != null)
	      {
		((FramePeer) peer).setMenuBar(null);
		menuBar.removeNotify();
	      }
	    menuBar.setParent(null);
	  }
	menuBar = null;
      }
    else
      super.remove(menu);
  }

  public void addNotify()
  {
    if (menuBar != null)
      menuBar.addNotify();
    if (peer == null)
      peer = getToolkit ().createFrame (this);

    super.addNotify();
  }

  public void removeNotify()
  {
    if (menuBar != null)
      menuBar.removeNotify();
    super.removeNotify();
  }

  /**
   * Returns a debugging string describing this window.
   *
   * @return a debugging string describing this window
   */
  protected String paramString()
  {
    String title = getTitle();

    String resizable = "";
    if (isResizable ())
      resizable = ",resizable";

    String state = "";
    switch (getState ())
      {
      case NORMAL:
        state = ",normal";
        break;
      case ICONIFIED:
        state = ",iconified";
        break;
      case MAXIMIZED_BOTH:
        state = ",maximized-both";
        break;
      case MAXIMIZED_HORIZ:
        state = ",maximized-horiz";
        break;
      case MAXIMIZED_VERT:
        state = ",maximized-vert";
        break;
      }

    return super.paramString () + ",title=" + title + resizable + state;
  }

  private static ArrayList weakFrames = new ArrayList();

  private static void noteFrame(Frame f)
  {
    weakFrames.add(new WeakReference(f));
  }

  public static Frame[] getFrames()
  {
    int n = 0;
    synchronized (weakFrames)
    {
      Iterator i = weakFrames.iterator();
      while (i.hasNext())
        {
          WeakReference wr = (WeakReference) i.next();
          if (wr.get() != null)
            ++n;
        }
      if (n == 0)
        return new Frame[0];
      else
        {
          Frame[] frames = new Frame[n];
          n = 0;
          i = weakFrames.iterator();
          while (i.hasNext())
            {
              WeakReference wr = (WeakReference) i.next();
              if (wr.get() != null)
                frames[n++] = (Frame) wr.get();
            }
          return frames;
        }
    }
  }

  public void setState(int state)
  {
    int current_state = getExtendedState ();

    if (state == NORMAL
        && (current_state & ICONIFIED) != 0)
      setExtendedState(current_state | ICONIFIED);
    
    if (state == ICONIFIED
        && (current_state & ~ICONIFIED) == 0)
      setExtendedState(current_state & ~ICONIFIED);
  }

  public int getState()
  {
    // FIXME: State might have changed in the peer... Must check.
    return (state & ICONIFIED) != 0 ? ICONIFIED : NORMAL;
  }

  /**
   * @since 1.4
   */
  public void setExtendedState(int state)
  {
    this.state = state;
  }

  /**
   * @since 1.4
   */
  public int getExtendedState()
  {
    return state;
  }

  /**
   * @since 1.4
   */
  public void setMaximizedBounds(Rectangle maximizedBounds)
  {
    this.maximizedBounds = maximizedBounds;
  }

  /**
   * Returns the maximized bounds of this frame.
   *
   * @return the maximized rectangle, may be null
   *
   * @since 1.4
   */
  public Rectangle getMaximizedBounds()
  {
    return maximizedBounds;
  }

  /**
   * Returns whether this frame is undecorated or not.
   * 
   * @since 1.4
   */
  public boolean isUndecorated()
  {
    return undecorated;
  }

  /**
   * Disables or enables decorations for this frame. This method can only be
   * called while the frame is not displayable.
   * 
   * @throws IllegalComponentStateException if this frame is displayable
   * 
   * @since 1.4
   */
  public void setUndecorated(boolean undecorated)
  {
    if (isDisplayable())
      throw new IllegalComponentStateException();

    this.undecorated = undecorated;
  }

  /**
   * Generate a unique name for this frame.
   *
   * @return a unique name for this frame
   */
  String generateName()
  {
    return "frame" + getUniqueLong();
  }

  private static synchronized long getUniqueLong()
  {
    return next_frame_number++;
  }
  
  protected class AccessibleAWTFrame extends AccessibleAWTWindow
  {
    private static final long serialVersionUID = -6172960752956030250L;

    public AccessibleRole getAccessibleRole()
    {
      return AccessibleRole.FRAME;
    }
    
    public AccessibleStateSet getAccessibleState()
    {
      AccessibleStateSet states = super.getAccessibleStateSet();
      if (isResizable())
        states.add(AccessibleState.RESIZABLE);
      if ((state & ICONIFIED) != 0)
        states.add(AccessibleState.ICONIFIED);
      return states;
    }
  }
  
  /**
   * Gets the AccessibleContext associated with this <code>Frame</code>.
   * The context is created, if necessary.
   *
   * @return the associated context
   */
  public AccessibleContext getAccessibleContext()
  {
    // Create the context if this is the first request.
    if (accessibleContext == null)
      accessibleContext = new AccessibleAWTFrame();
    return accessibleContext;
  }
}