/*

 * 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.event.*;

import javax.swing.plaf.*;

import javax.swing.plaf.basic.*;

import javax.swing.border.*;

import java.applet.Applet;

import java.awt.Component;

import java.awt.Container;

import java.awt.Dimension;

import java.awt.KeyboardFocusManager;

import java.awt.Window;

import java.awt.event.*;

import java.awt.AWTEvent;

import java.awt.Toolkit;

import java.beans.PropertyChangeListener;

import java.beans.PropertyChangeEvent;

import java.util.*;

import sun.swing.DefaultLookup;

import sun.swing.UIAction;

import sun.awt.AppContext;

/**

 * A Windows L&F implementation of PopupMenuUI.  This implementation

 * is a "combined" view/controller.

 *

 * @author Georges Saab

 * @author David Karlton

 * @author Arnaud Weber

 */

public class BasicPopupMenuUI extends PopupMenuUI {

    static final StringBuilder MOUSE_GRABBER_KEY = new StringBuilder(

                   "javax.swing.plaf.basic.BasicPopupMenuUI.MouseGrabber");

    static final StringBuilder MENU_KEYBOARD_HELPER_KEY = new StringBuilder(

                   "javax.swing.plaf.basic.BasicPopupMenuUI.MenuKeyboardHelper");

    /**

     * The instance of {@code JPopupMenu}.

     */

    protected JPopupMenu popupMenu = null;

    private transient PopupMenuListener popupMenuListener = null;

    private MenuKeyListener menuKeyListener = null;

    private static boolean checkedUnpostPopup;

    private static boolean unpostPopup;

    /**

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

     *

     * @param x a component

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

     */

    public static ComponentUI createUI(JComponent x) {

        return new BasicPopupMenuUI();

    }

    /**

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

     */

    public BasicPopupMenuUI() {

        BasicLookAndFeel.needsEventHelper = true;

        LookAndFeel laf = UIManager.getLookAndFeel();

        if (laf instanceof BasicLookAndFeel) {

            ((BasicLookAndFeel)laf).installAWTEventListener();

        }

    }

    public void installUI(JComponent c) {

        popupMenu = (JPopupMenu) c;

        installDefaults();

        installListeners();

        installKeyboardActions();

    }

    /**

     * Installs default properties.

     */

    public void installDefaults() {

        if (popupMenu.getLayout() == null ||

            popupMenu.getLayout() instanceof UIResource)

            popupMenu.setLayout(new DefaultMenuLayout(popupMenu, BoxLayout.Y_AXIS));

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

        LookAndFeel.installBorder(popupMenu, "PopupMenu.border");

        LookAndFeel.installColorsAndFont(popupMenu,

                "PopupMenu.background",

                "PopupMenu.foreground",

                "PopupMenu.font");

    }

    /**

     * Registers listeners.

     */

    protected void installListeners() {

        if (popupMenuListener == null) {

            popupMenuListener = new BasicPopupMenuListener();

        }

        popupMenu.addPopupMenuListener(popupMenuListener);

        if (menuKeyListener == null) {

            menuKeyListener = new BasicMenuKeyListener();

        }

        popupMenu.addMenuKeyListener(menuKeyListener);

        AppContext context = AppContext.getAppContext();

        synchronized (MOUSE_GRABBER_KEY) {

            MouseGrabber mouseGrabber = (MouseGrabber)context.get(

                                                     MOUSE_GRABBER_KEY);

            if (mouseGrabber == null) {

                mouseGrabber = new MouseGrabber();

                context.put(MOUSE_GRABBER_KEY, mouseGrabber);

            }

        }

        synchronized (MENU_KEYBOARD_HELPER_KEY) {

            MenuKeyboardHelper helper =

                    (MenuKeyboardHelper)context.get(MENU_KEYBOARD_HELPER_KEY);

            if (helper == null) {

                helper = new MenuKeyboardHelper();

                context.put(MENU_KEYBOARD_HELPER_KEY, helper);

                MenuSelectionManager msm = MenuSelectionManager.defaultManager();

                msm.addChangeListener(helper);

            }

        }

    }

    /**

     * Registers keyboard actions.

     */

    protected void installKeyboardActions() {

    }

    static InputMap getInputMap(JPopupMenu popup, JComponent c) {

        InputMap windowInputMap = null;

        Object[] bindings = (Object[])UIManager.get("PopupMenu.selectedWindowInputMapBindings");

        if (bindings != null) {

            windowInputMap = LookAndFeel.makeComponentInputMap(c, bindings);

            if (!popup.getComponentOrientation().isLeftToRight()) {

                Object[] km = (Object[])UIManager.get("PopupMenu.selectedWindowInputMapBindings.RightToLeft");

                if (km != null) {

                    InputMap rightToLeftInputMap = LookAndFeel.makeComponentInputMap(c, km);

                    rightToLeftInputMap.setParent(windowInputMap);

                    windowInputMap = rightToLeftInputMap;

                }

            }

        }

        return windowInputMap;

    }

    static ActionMap getActionMap() {

        return LazyActionMap.getActionMap(BasicPopupMenuUI.class,

                                          "PopupMenu.actionMap");

    }

    static void loadActionMap(LazyActionMap map) {

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

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

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

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

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

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

        BasicLookAndFeel.installAudioActionMap(map);

    }

    public void uninstallUI(JComponent c) {

        uninstallDefaults();

        uninstallListeners();

        uninstallKeyboardActions();

        popupMenu = null;

    }

    /**

     * Uninstalls default properties.

     */

    protected void uninstallDefaults() {

        LookAndFeel.uninstallBorder(popupMenu);

    }

    /**

     * Unregisters listeners.

     */

    protected void uninstallListeners() {

        if (popupMenuListener != null) {

            popupMenu.removePopupMenuListener(popupMenuListener);

        }

        if (menuKeyListener != null) {

            popupMenu.removeMenuKeyListener(menuKeyListener);

        }

    }

    /**

     * Unregisters keyboard actions.

     */

    protected void uninstallKeyboardActions() {

        SwingUtilities.replaceUIActionMap(popupMenu, null);

        SwingUtilities.replaceUIInputMap(popupMenu,

                                  JComponent.WHEN_IN_FOCUSED_WINDOW, null);

    }

    static MenuElement getFirstPopup() {

        MenuSelectionManager msm = MenuSelectionManager.defaultManager();

        MenuElement[] p = msm.getSelectedPath();

        MenuElement me = null;

        for(int i = 0 ; me == null && i < p.length ; i++) {

            if (p[i] instanceof JPopupMenu)

                me = p[i];

        }

        return me;

    }

    static JPopupMenu getLastPopup() {

        MenuSelectionManager msm = MenuSelectionManager.defaultManager();

        MenuElement[] p = msm.getSelectedPath();

        JPopupMenu popup = null;

        for(int i = p.length - 1; popup == null && i >= 0; i--) {

            if (p[i] instanceof JPopupMenu)

                popup = (JPopupMenu)p[i];

        }

        return popup;

    }

    static List<JPopupMenu> getPopups() {

        MenuSelectionManager msm = MenuSelectionManager.defaultManager();

        MenuElement[] p = msm.getSelectedPath();

        List<JPopupMenu> list = new ArrayList<JPopupMenu>(p.length);

        for (MenuElement element : p) {

            if (element instanceof JPopupMenu) {

                list.add((JPopupMenu) element);

            }

        }

        return list;

    }

    public boolean isPopupTrigger(MouseEvent e) {

        return ((e.getID()==MouseEvent.MOUSE_RELEASED)

                && ((e.getModifiers() & MouseEvent.BUTTON3_MASK)!=0));

    }

    private static boolean checkInvokerEqual(MenuElement present, MenuElement last) {

        Component invokerPresent = present.getComponent();

        Component invokerLast = last.getComponent();

        if (invokerPresent instanceof JPopupMenu) {

            invokerPresent = ((JPopupMenu)invokerPresent).getInvoker();

    }

        if (invokerLast instanceof JPopupMenu) {

            invokerLast = ((JPopupMenu)invokerLast).getInvoker();

        }

        return (invokerPresent == invokerLast);

    }

    /**

     * This Listener fires the Action that provides the correct auditory

     * feedback.

     *

     * @since 1.4

     */

    private class BasicPopupMenuListener implements PopupMenuListener {

        public void popupMenuCanceled(PopupMenuEvent e) {

        }

        public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {

        }

        public void popupMenuWillBecomeVisible(PopupMenuEvent e) {

            BasicLookAndFeel.playSound((JPopupMenu)e.getSource(),

                                       "PopupMenu.popupSound");

        }

    }

    /**

     * Handles mnemonic for children JMenuItems.

     * @since 1.5

     */

    private class BasicMenuKeyListener implements MenuKeyListener {

        MenuElement menuToOpen = null;

        public void menuKeyTyped(MenuKeyEvent e) {

            if (menuToOpen != null) {

                // we have a submenu to open

                JPopupMenu subpopup = ((JMenu)menuToOpen).getPopupMenu();

                MenuElement subitem = findEnabledChild(

                        subpopup.getSubElements(), -1, true);

                ArrayList<MenuElement> lst = new ArrayList<MenuElement>(Arrays.asList(e.getPath()));

                lst.add(menuToOpen);

                lst.add(subpopup);

                if (subitem != null) {

                    lst.add(subitem);

                }

                MenuElement newPath[] = new MenuElement[0];

                newPath = lst.toArray(newPath);

                MenuSelectionManager.defaultManager().setSelectedPath(newPath);

                e.consume();

            }

            menuToOpen = null;

        }

        public void menuKeyPressed(MenuKeyEvent e) {

            char keyChar = e.getKeyChar();

            // Handle the case for Escape or Enter...

            if (!Character.isLetterOrDigit(keyChar)) {

                return;

            }

            MenuSelectionManager manager = e.getMenuSelectionManager();

            MenuElement path[] = e.getPath();

            MenuElement items[] = popupMenu.getSubElements();

            int currentIndex = -1;

            int matches = 0;

            int firstMatch = -1;

            int indexes[] = null;

            for (int j = 0; j < items.length; j++) {

                if (! (items[j] instanceof JMenuItem)) {

                    continue;

                }

                JMenuItem item = (JMenuItem)items[j];

                int mnemonic = item.getMnemonic();

                if (item.isEnabled() &&

                    item.isVisible() && lower(keyChar) == lower(mnemonic)) {

                    if (matches == 0) {

                        firstMatch = j;

                        matches++;

                    } else {

                        if (indexes == null) {

                            indexes = new int[items.length];

                            indexes[0] = firstMatch;

                        }

                        indexes[matches++] = j;

                    }

                }

                if (item.isArmed() || item.isSelected()) {

                    currentIndex = matches - 1;

                }

            }

            if (matches == 0) {

                // no op

            } else if (matches == 1) {

                // Invoke the menu action

                JMenuItem item = (JMenuItem)items[firstMatch];

                if (item instanceof JMenu) {

                    // submenus are handled in menuKeyTyped

                    menuToOpen = item;

                } else if (item.isEnabled()) {

                    // we have a menu item

                    manager.clearSelectedPath();

                    item.doClick();

                }

                e.consume();

            } else {

                // Select the menu item with the matching mnemonic. If

                // the same mnemonic has been invoked then select the next

                // menu item in the cycle.

                MenuElement newItem;

                newItem = items[indexes[(currentIndex + 1) % matches]];

                MenuElement newPath[] = new MenuElement[path.length+1];

                System.arraycopy(path, 0, newPath, 0, path.length);

                newPath[path.length] = newItem;

                manager.setSelectedPath(newPath);

                e.consume();

            }

        }

        public void menuKeyReleased(MenuKeyEvent e) {

        }

        private char lower(char keyChar) {

            return Character.toLowerCase(keyChar);

        }

        private char lower(int mnemonic) {

            return Character.toLowerCase((char) mnemonic);

        }

    }

    private static class Actions extends UIAction {

        // Types of actions

        private static final String CANCEL = "cancel";

        private static final String SELECT_NEXT = "selectNext";

        private static final String SELECT_PREVIOUS = "selectPrevious";

        private static final String SELECT_PARENT = "selectParent";

        private static final String SELECT_CHILD = "selectChild";

        private static final String RETURN = "return";

        // Used for next/previous actions

        private static final boolean FORWARD = true;

        private static final boolean BACKWARD = false;

        // Used for parent/child actions

        private static final boolean PARENT = false;

        private static final boolean CHILD = true;

        Actions(String key) {

            super(key);

        }

        public void actionPerformed(ActionEvent e) {

            String key = getName();

            if (key == CANCEL) {

                cancel();

            }

            else if (key == SELECT_NEXT) {

                selectItem(FORWARD);

            }

            else if (key == SELECT_PREVIOUS) {

                selectItem(BACKWARD);

            }

            else if (key == SELECT_PARENT) {

                selectParentChild(PARENT);

            }

            else if (key == SELECT_CHILD) {

                selectParentChild(CHILD);

            }

            else if (key == RETURN) {

                doReturn();

            }

        }

        private void doReturn() {

            KeyboardFocusManager fmgr =

                KeyboardFocusManager.getCurrentKeyboardFocusManager();

            Component focusOwner = fmgr.getFocusOwner();

            if(focusOwner != null && !(focusOwner instanceof JRootPane)) {

                return;

            }

            MenuSelectionManager msm = MenuSelectionManager.defaultManager();

            MenuElement path[] = msm.getSelectedPath();

            MenuElement lastElement;

            if(path.length > 0) {

                lastElement = path[path.length-1];

                if(lastElement instanceof JMenu) {

                    MenuElement newPath[] = new MenuElement[path.length+1];

                    System.arraycopy(path,0,newPath,0,path.length);

                    newPath[path.length] = ((JMenu)lastElement).getPopupMenu();

                    msm.setSelectedPath(newPath);

                } else if(lastElement instanceof JMenuItem) {

                    JMenuItem mi = (JMenuItem)lastElement;

                    if (mi.getUI() instanceof BasicMenuItemUI) {

                        ((BasicMenuItemUI)mi.getUI()).doClick(msm);

                    }

                    else {

                        msm.clearSelectedPath();

                        mi.doClick(0);

                    }

                }

            }

        }

        private void selectParentChild(boolean direction) {

            MenuSelectionManager msm = MenuSelectionManager.defaultManager();

            MenuElement path[] = msm.getSelectedPath();

            int len = path.length;

            if (direction == PARENT) {

                // selecting parent

                int popupIndex = len-1;

                if (len > 2 &&

                    // check if we have an open submenu. A submenu item may or

                    // may not be selected, so submenu popup can be either the

                    // last or next to the last item.

                    (path[popupIndex] instanceof JPopupMenu ||

                     path[--popupIndex] instanceof JPopupMenu) &&

                    !((JMenu)path[popupIndex-1]).isTopLevelMenu()) {

                    // we have a submenu, just close it

                    MenuElement newPath[] = new MenuElement[popupIndex];

                    System.arraycopy(path, 0, newPath, 0, popupIndex);

                    msm.setSelectedPath(newPath);

                    return;

                }

            } else {

                // selecting child

                if (len > 0 && path[len-1] instanceof JMenu &&

                    !((JMenu)path[len-1]).isTopLevelMenu()) {

                    // we have a submenu, open it