1 /*
   2  * Copyright (c) 1998, 2008, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 
  27 package com.sun.java.swing.plaf.windows;
  28 
  29 import javax.swing.DefaultDesktopManager;
  30 import javax.swing.JInternalFrame;
  31 import javax.swing.JLayeredPane;
  32 import java.awt.Component;
  33 import java.awt.Container;
  34 import java.awt.Dimension;
  35 import java.beans.PropertyVetoException;
  36 import java.util.Vector;
  37 import java.lang.ref.WeakReference;
  38 
  39 /**
  40  * This class implements a DesktopManager which more closely follows
  41  * the MDI model than the DefaultDesktopManager.  Unlike the
  42  * DefaultDesktopManager policy, MDI requires that the selected
  43  * and activated child frames are the same, and that that frame
  44  * always be the top-most window.
  45  * <p>
  46  * The maximized state is managed by the DesktopManager with MDI,
  47  * instead of just being a property of the individual child frame.
  48  * This means that if the currently selected window is maximized
  49  * and another window is selected, that new window will be maximized.
  50  *
  51  * @see javax.swing.DefaultDesktopManager
  52  * @author Thomas Ball
  53  */
  54 public class WindowsDesktopManager extends DefaultDesktopManager
  55         implements java.io.Serializable, javax.swing.plaf.UIResource {
  56 
  57     /* The frame which is currently selected/activated.
  58      * We store this value to enforce MDI's single-selection model.
  59      */
  60     private WeakReference<JInternalFrame> currentFrameRef;
  61 
  62     public void activateFrame(JInternalFrame f) {
  63         JInternalFrame currentFrame = currentFrameRef != null ?
  64             currentFrameRef.get() : null;
  65         try {
  66             super.activateFrame(f);
  67             if (currentFrame != null && f != currentFrame) {
  68                 // If the current frame is maximized, transfer that
  69                 // attribute to the frame being activated.
  70                 if (currentFrame.isMaximum() &&
  71                     (f.getClientProperty("JInternalFrame.frameType") !=
  72                     "optionDialog") ) {
  73                     //Special case.  If key binding was used to select next
  74                     //frame instead of minimizing the icon via the minimize
  75                     //icon.
  76                     if (!currentFrame.isIcon()) {
  77                         currentFrame.setMaximum(false);
  78                         if (f.isMaximizable()) {
  79                             if (!f.isMaximum()) {
  80                                 f.setMaximum(true);
  81                             } else if (f.isMaximum() && f.isIcon()) {
  82                                 f.setIcon(false);
  83                             } else {
  84                                 f.setMaximum(false);
  85                             }
  86                         }
  87                     }
  88                 }
  89                 if (currentFrame.isSelected()) {
  90                     currentFrame.setSelected(false);
  91                 }
  92             }
  93 
  94             if (!f.isSelected()) {
  95                 f.setSelected(true);
  96             }
  97         } catch (PropertyVetoException e) {}
  98         if (f != currentFrame) {
  99             currentFrameRef = new WeakReference<JInternalFrame>(f);
 100         }
 101     }
 102 
 103 }