/*

 * Copyright (c) 1998, 2008, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package com.sun.java.swing.plaf.windows;

import javax.swing.DefaultDesktopManager;

import javax.swing.JInternalFrame;

import javax.swing.JLayeredPane;

import java.awt.Component;

import java.awt.Container;

import java.awt.Dimension;

import java.beans.PropertyVetoException;

import java.util.Vector;

import java.lang.ref.WeakReference;

/**

 * This class implements a DesktopManager which more closely follows

 * the MDI model than the DefaultDesktopManager.  Unlike the

 * DefaultDesktopManager policy, MDI requires that the selected

 * and activated child frames are the same, and that that frame

 * always be the top-most window.

 * <p>

 * The maximized state is managed by the DesktopManager with MDI,

 * instead of just being a property of the individual child frame.

 * This means that if the currently selected window is maximized

 * and another window is selected, that new window will be maximized.

 *

 * @see javax.swing.DefaultDesktopManager

 * @author Thomas Ball

 */

public class WindowsDesktopManager extends DefaultDesktopManager

        implements java.io.Serializable, javax.swing.plaf.UIResource {

    /* The frame which is currently selected/activated.

     * We store this value to enforce MDI's single-selection model.

     */

    private WeakReference<JInternalFrame> currentFrameRef;

    public void activateFrame(JInternalFrame f) {

        JInternalFrame currentFrame = currentFrameRef != null ?

            currentFrameRef.get() : null;

        try {

            super.activateFrame(f);

            if (currentFrame != null && f != currentFrame) {

                // If the current frame is maximized, transfer that

                // attribute to the frame being activated.

                if (currentFrame.isMaximum() &&

                    (f.getClientProperty("JInternalFrame.frameType") !=

                    "optionDialog") ) {

                    //Special case.  If key binding was used to select next

                    //frame instead of minimizing the icon via the minimize

                    //icon.

                    if (!currentFrame.isIcon()) {

                        currentFrame.setMaximum(false);

                        if (f.isMaximizable()) {

                            if (!f.isMaximum()) {

                                f.setMaximum(true);

                            } else if (f.isMaximum() && f.isIcon()) {

                                f.setIcon(false);

                            } else {

                                f.setMaximum(false);

                            }

                        }

                    }

                }

                if (currentFrame.isSelected()) {

                    currentFrame.setSelected(false);

                }

            }

            if (!f.isSelected()) {

                f.setSelected(true);

            }

        } catch (PropertyVetoException e) {}

        if (f != currentFrame) {

            currentFrameRef = new WeakReference<JInternalFrame>(f);

        }

    }

}