/*

 * Copyright (c) 1997, 2014, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package javax.swing.plaf.basic;

import javax.swing.*;

import javax.swing.plaf.*;

import java.beans.*;

import java.awt.event.*;

import java.awt.Dimension;

import java.awt.Insets;

import java.awt.Graphics;

import java.awt.KeyboardFocusManager;

import java.awt.*;

import java.util.Vector;

import sun.swing.DefaultLookup;

import sun.swing.UIAction;

import sun.awt.AppContext;

/**

 * Basic L&F for a desktop.

 *

 * @author Steve Wilson

 */

public class BasicDesktopPaneUI extends DesktopPaneUI {

    // Old actions forward to an instance of this.

    private static final Actions SHARED_ACTION = new Actions();

    private static Dimension minSize = new Dimension(0,0);

    private static Dimension maxSize = new Dimension(Integer.MAX_VALUE,

            Integer.MAX_VALUE);

    private Handler handler;

    private PropertyChangeListener pcl;

    /**

     * The instance of {@code JDesktopPane}.

     */

    protected JDesktopPane desktop;

    /**

     * The instance of {@code DesktopManager}.

     */

    protected DesktopManager desktopManager;

    /**

     * As of Java 2 platform v1.3 this previously undocumented field is no

     * longer used.

     * Key bindings are now defined by the LookAndFeel, please refer to

     * the key bindings specification for further details.

     *

     * @deprecated As of 1.3.

     */

    @Deprecated

    protected KeyStroke minimizeKey;

    /**

     * As of Java 2 platform v1.3 this previously undocumented field is no

     * longer used.

     * Key bindings are now defined by the LookAndFeel, please refer to

     * the key bindings specification for further details.

     *

     * @deprecated As of 1.3.

     */

    @Deprecated

    protected KeyStroke maximizeKey;

    /**

     * As of Java 2 platform v1.3 this previously undocumented field is no

     * longer used.

     * Key bindings are now defined by the LookAndFeel, please refer to

     * the key bindings specification for further details.

     *

     * @deprecated As of 1.3.

     */

    @Deprecated

    protected KeyStroke closeKey;

    /**

     * As of Java 2 platform v1.3 this previously undocumented field is no

     * longer used.

     * Key bindings are now defined by the LookAndFeel, please refer to

     * the key bindings specification for further details.

     *

     * @deprecated As of 1.3.

     */

    @Deprecated

    protected KeyStroke navigateKey;

    /**

     * As of Java 2 platform v1.3 this previously undocumented field is no

     * longer used.

     * Key bindings are now defined by the LookAndFeel, please refer to

     * the key bindings specification for further details.

     *

     * @deprecated As of 1.3.

     */

    @Deprecated

    protected KeyStroke navigateKey2;

    /**

     * Constructs a new instance of {@code BasicDesktopPaneUI}.

     *

     * @param c a component

     * @return a new instance of {@code BasicDesktopPaneUI}

     */

    public static ComponentUI createUI(JComponent c) {

        return new BasicDesktopPaneUI();

    }

    /**

     * Constructs a new instance of {@code BasicDesktopPaneUI}.

     */

    public BasicDesktopPaneUI() {

    }

    public void installUI(JComponent c)   {

        desktop = (JDesktopPane)c;

        installDefaults();

        installDesktopManager();

        installListeners();

        installKeyboardActions();

    }

    public void uninstallUI(JComponent c) {

        uninstallKeyboardActions();

        uninstallListeners();

        uninstallDesktopManager();

        uninstallDefaults();

        desktop = null;

        handler = null;

    }

    /**

     * Installs default properties.

     */

    protected void installDefaults() {

        if (desktop.getBackground() == null ||

            desktop.getBackground() instanceof UIResource) {

            desktop.setBackground(UIManager.getColor("Desktop.background"));

        }

        LookAndFeel.installProperty(desktop, "opaque", Boolean.TRUE);

    }

    /**

     * Uninstalls default properties.

     */

    protected void uninstallDefaults() { }

    /**

     * Installs the <code>PropertyChangeListener</code> returned from

     * <code>createPropertyChangeListener</code> on the

     * <code>JDesktopPane</code>.

     *

     * @since 1.5

     * @see #createPropertyChangeListener

     */

    protected void installListeners() {

        pcl = createPropertyChangeListener();

        desktop.addPropertyChangeListener(pcl);

    }

    /**

     * Uninstalls the <code>PropertyChangeListener</code> returned from

     * <code>createPropertyChangeListener</code> from the

     * <code>JDesktopPane</code>.

     *

     * @since 1.5

     * @see #createPropertyChangeListener

     */

    protected void uninstallListeners() {

        desktop.removePropertyChangeListener(pcl);

        pcl = null;

    }

    /**

     * Installs desktop manager.

     */

    protected void installDesktopManager() {

        desktopManager = desktop.getDesktopManager();

        if(desktopManager == null) {

            desktopManager = new BasicDesktopManager();

            desktop.setDesktopManager(desktopManager);

        }

    }

    /**

     * Uninstalls desktop manager.

     */

    protected void uninstallDesktopManager() {

        if(desktop.getDesktopManager() instanceof UIResource) {

            desktop.setDesktopManager(null);

        }

        desktopManager = null;

    }

    /**

     * Installs keyboard actions.

     */

    protected void installKeyboardActions(){

        InputMap inputMap = getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);

        if (inputMap != null) {

            SwingUtilities.replaceUIInputMap(desktop,

                        JComponent.WHEN_IN_FOCUSED_WINDOW, inputMap);

        }

        inputMap = getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);

        if (inputMap != null) {

            SwingUtilities.replaceUIInputMap(desktop,

                        JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT,

                        inputMap);

        }

        LazyActionMap.installLazyActionMap(desktop, BasicDesktopPaneUI.class,

                "DesktopPane.actionMap");

        registerKeyboardActions();

    }

    /**

     * Registers keyboard actions.

     */

    protected void registerKeyboardActions(){

    }

    /**

     * Unregisters keyboard actions.

     */

    protected void unregisterKeyboardActions(){

    }

    InputMap getInputMap(int condition) {

        if (condition == JComponent.WHEN_IN_FOCUSED_WINDOW) {

            return createInputMap(condition);

        }

        else if (condition == JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT) {

            return (InputMap)DefaultLookup.get(desktop, this,

                    "Desktop.ancestorInputMap");

        }

        return null;

    }

    InputMap createInputMap(int condition) {

        if (condition == JComponent.WHEN_IN_FOCUSED_WINDOW) {

            Object[] bindings = (Object[])DefaultLookup.get(desktop,

                    this, "Desktop.windowBindings");

            if (bindings != null) {

                return LookAndFeel.makeComponentInputMap(desktop, bindings);

            }

        }

        return null;

    }

    static void loadActionMap(LazyActionMap map) {

        map.put(new Actions(Actions.RESTORE));

        map.put(new Actions(Actions.CLOSE));

        map.put(new Actions(Actions.MOVE));

        map.put(new Actions(Actions.RESIZE));

        map.put(new Actions(Actions.LEFT));

        map.put(new Actions(Actions.SHRINK_LEFT));

        map.put(new Actions(Actions.RIGHT));

        map.put(new Actions(Actions.SHRINK_RIGHT));

        map.put(new Actions(Actions.UP));

        map.put(new Actions(Actions.SHRINK_UP));

        map.put(new Actions(Actions.DOWN));

        map.put(new Actions(Actions.SHRINK_DOWN));

        map.put(new Actions(Actions.ESCAPE));

        map.put(new Actions(Actions.MINIMIZE));

        map.put(new Actions(Actions.MAXIMIZE));

        map.put(new Actions(Actions.NEXT_FRAME));

        map.put(new Actions(Actions.PREVIOUS_FRAME));

        map.put(new Actions(Actions.NAVIGATE_NEXT));

        map.put(new Actions(Actions.NAVIGATE_PREVIOUS));

    }

    /**

     * Unregisters keyboard actions.

     */

    protected void uninstallKeyboardActions(){

      unregisterKeyboardActions();

      SwingUtilities.replaceUIInputMap(desktop, JComponent.

                                     WHEN_IN_FOCUSED_WINDOW, null);

      SwingUtilities.replaceUIInputMap(desktop, JComponent.

                                     WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, null);

      SwingUtilities.replaceUIActionMap(desktop, null);

    }

    public void paint(Graphics g, JComponent c) {}

    public Dimension getPreferredSize(JComponent c) {return null;}

    public Dimension getMinimumSize(JComponent c) {

        return minSize;

        }

    public Dimension getMaximumSize(JComponent c){

        return maxSize;

    }

    /**

     * Returns the <code>PropertyChangeListener</code> to install on

     * the <code>JDesktopPane</code>.

     *

     * @since 1.5

     * @return The PropertyChangeListener that will be added to track

     * changes in the desktop pane.

     */

    protected PropertyChangeListener createPropertyChangeListener() {

        return getHandler();

    }

    private Handler getHandler() {

        if (handler == null) {

            handler = new Handler();

        }

        return handler;

    }

    private class Handler implements PropertyChangeListener {

        public void propertyChange(PropertyChangeEvent evt) {

            String propertyName = evt.getPropertyName();

            if ("desktopManager" == propertyName) {

                installDesktopManager();

            }

        }

    }

    /**

     * The default DesktopManager installed by the UI.

     */

    @SuppressWarnings("serial") // JDK-implementation class

    private class BasicDesktopManager extends DefaultDesktopManager

            implements UIResource {

    }

    private static class Actions extends UIAction {

        private static String CLOSE = "close";

        private static String ESCAPE = "escape";

        private static String MAXIMIZE = "maximize";

        private static String MINIMIZE = "minimize";

        private static String MOVE = "move";

        private static String RESIZE = "resize";

        private static String RESTORE = "restore";

        private static String LEFT = "left";

        private static String RIGHT = "right";

        private static String UP = "up";

        private static String DOWN = "down";

        private static String SHRINK_LEFT = "shrinkLeft";

        private static String SHRINK_RIGHT = "shrinkRight";

        private static String SHRINK_UP = "shrinkUp";

        private static String SHRINK_DOWN = "shrinkDown";

        private static String NEXT_FRAME = "selectNextFrame";

        private static String PREVIOUS_FRAME = "selectPreviousFrame";

        private static String NAVIGATE_NEXT = "navigateNext";

        private static String NAVIGATE_PREVIOUS = "navigatePrevious";

        private final int MOVE_RESIZE_INCREMENT = 10;

        private static boolean moving = false;

        private static boolean resizing = false;

        private static JInternalFrame sourceFrame = null;

        private static Component focusOwner = null;

        Actions() {

            super(null);

        }

        Actions(String name) {

            super(name);

        }

        public void actionPerformed(ActionEvent e) {

            JDesktopPane dp = (JDesktopPane)e.getSource();

            String key = getName();

            if (CLOSE == key || MAXIMIZE == key || MINIMIZE == key ||

                    RESTORE == key) {

                setState(dp, key);

            }

            else if (ESCAPE == key) {

                if (sourceFrame == dp.getSelectedFrame() &&

                        focusOwner != null) {

                    focusOwner.requestFocus();

                }

                moving = false;

                resizing = false;

                sourceFrame = null;

                focusOwner = null;

            }

            else if (MOVE == key || RESIZE == key) {

                sourceFrame = dp.getSelectedFrame();

                if (sourceFrame == null) {

                    return;

                }

                moving = (key == MOVE) ? true : false;

                resizing = (key == RESIZE) ? true : false;

                focusOwner = KeyboardFocusManager.

                    getCurrentKeyboardFocusManager().getFocusOwner();

                if (!SwingUtilities.isDescendingFrom(focusOwner, sourceFrame)) {

                    focusOwner = null;

                }

                sourceFrame.requestFocus();

            }

            else if (LEFT == key ||

                     RIGHT == key ||

                     UP == key ||

                     DOWN == key ||

                     SHRINK_RIGHT == key ||

                     SHRINK_LEFT == key ||

                     SHRINK_UP == key ||

                     SHRINK_DOWN == key) {

                JInternalFrame c = dp.getSelectedFrame();

                if (sourceFrame == null || c != sourceFrame ||

                        KeyboardFocusManager.

                            getCurrentKeyboardFocusManager().getFocusOwner() !=

                                sourceFrame) {

                    return;

                }

                Insets minOnScreenInsets =

                    UIManager.getInsets("Desktop.minOnScreenInsets");

                Dimension size = c.getSize();

                Dimension minSize = c.getMinimumSize();

                int dpWidth = dp.getWidth();

                int dpHeight = dp.getHeight();

                int delta;

                Point loc = c.getLocation();

                if (LEFT == key) {

                    if (moving) {

                        c.setLocation(

                                loc.x + size.width - MOVE_RESIZE_INCREMENT <

                                    minOnScreenInsets.right ?

                                        -size.width + minOnScreenInsets.right :

                                        loc.x - MOVE_RESIZE_INCREMENT,

                                loc.y);

                    } else if (resizing) {

                        c.setLocation(loc.x - MOVE_RESIZE_INCREMENT, loc.y);

                        c.setSize(size.width + MOVE_RESIZE_INCREMENT,

                                size.height);

                    }

                } else if (RIGHT == key) {

                    if (moving) {

                        c.setLocation(

                                loc.x + MOVE_RESIZE_INCREMENT >

                                    dpWidth - minOnScreenInsets.left ?

                                        dpWidth - minOnScreenInsets.left :

                                        loc.x + MOVE_RESIZE_INCREMENT,

                                loc.y);

                    } else if (resizing) {

                        c.setSize(size.width + MOVE_RESIZE_INCREMENT,

                                size.height);

                    }

                } else if (UP == key) {

                    if (moving) {

                        c.setLocation(loc.x,

                                loc.y + size.height - MOVE_RESIZE_INCREMENT <

                                    minOnScreenInsets.bottom ?

                                        -size.height +

                                            minOnScreenInsets.bottom :

                                        loc.y - MOVE_RESIZE_INCREMENT);

                    } else if (resizing) {

                        c.setLocation(loc.x, loc.y - MOVE_RESIZE_INCREMENT);

                        c.setSize(size.width,

                                size.height + MOVE_RESIZE_INCREMENT);

                    }

                } else if (DOWN == key) {

                    if (moving) {

                        c.setLocation(loc.x,

                                loc.y + MOVE_RESIZE_INCREMENT >

                                    dpHeight - minOnScreenInsets.top ?

                                        dpHeight - minOnScreenInsets.top :

                                        loc.y + MOVE_RESIZE_INCREMENT);

                    } else if (resizing) {

                        c.setSize(size.width,

                                size.height + MOVE_RESIZE_INCREMENT);

                    }

                } else if (SHRINK_LEFT == key && resizing) {

                    // Make sure we don't resize less than minimum size.

                    if (minSize.width < (size.width - MOVE_RESIZE_INCREMENT)) {

                        delta = MOVE_RESIZE_INCREMENT;

                    } else {

                        delta = size.width - minSize.width;

                    }

                    // Ensure that we keep the internal frame on the desktop.

                    if (loc.x + size.width - delta < minOnScreenInsets.left) {

                        delta = loc.x + size.width - minOnScreenInsets.left;

                    }

                    c.setSize(size.width - delta, size.height);

                } else if (SHRINK_RIGHT == key && resizing) {

                    // Make sure we don't resize less than minimum size.

                    if (minSize.width < (size.width - MOVE_RESIZE_INCREMENT)) {

                        delta = MOVE_RESIZE_INCREMENT;

                    } else {

                        delta = size.width - minSize.width;

                    }

                    // Ensure that we keep the internal frame on the desktop.

                    if (loc.x + delta > dpWidth - minOnScreenInsets.right) {

                        delta = (dpWidth - minOnScreenInsets.right) - loc.x;

                    }

                    c.setLocation(loc.x + delta, loc.y);

                    c.setSize(size.width - delta, size.height);

                } else if (SHRINK_UP == key && resizing) {

                    // Make sure we don't resize less than minimum size.

                    if (minSize.height <

                            (size.height - MOVE_RESIZE_INCREMENT)) {

                        delta = MOVE_RESIZE_INCREMENT;