/*

 * Copyright 2002-2008 Sun Microsystems, Inc.  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.  Sun designates this

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

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.awt.X11;

import java.awt.*;

import java.awt.peer.*;

import java.awt.event.*;

import java.util.logging.*;

import java.lang.reflect.Field;

import java.lang.reflect.Method;

import java.lang.reflect.InvocationTargetException;

import sun.awt.SunToolkit;

public class XMenuItemPeer implements MenuItemPeer {

    /************************************************

     *

     * Data members

     *

     ************************************************/

    private static Logger log = Logger.getLogger("sun.awt.X11.XMenuItemPeer");

    /*

     * Primary members

     */

    /**

     * Window that this item belongs to.

     */

    private XBaseMenuWindow container;

    /**

     * Target MenuItem. Note that 'target' member

     * in XWindow is required for dispatching events.

     * This member is only used for accessing its fields

     * and firing ActionEvent & ItemEvent

     */

    private MenuItem target;

    /*

     * Mapping to window

     */

    /**

     * Rectange occupied by menu item in container's

     * coordinates. Filled by map(...) function from

     * XBaseMenuWindow.map()

     */

    private Rectangle bounds;

    /**

     * Point in container's coordinate system used as

     * origin by drawText.

     */

    private Point textOrigin;

    /*

     * Size constants

     */

    private final static int SEPARATOR_WIDTH = 20;

    private final static int SEPARATOR_HEIGHT = 5;

    /*

     * MenuItem's fields & methods

     */

    private final static Field f_enabled;

    private final static Field f_label;

    private final static Field f_shortcut;

    private final static Method m_getFont;

    private final static Method m_isItemEnabled;

    private final static Method m_getActionCommand;

    static {

        f_enabled = SunToolkit.getField(MenuItem.class, "enabled");

        f_label = SunToolkit.getField(MenuItem.class, "label");

        f_shortcut = SunToolkit.getField(MenuItem.class, "shortcut");

        m_getFont = SunToolkit.getMethod(MenuComponent.class, "getFont_NoClientCode", null);

        m_getActionCommand = SunToolkit.getMethod(MenuItem.class, "getActionCommandImpl", null);

        m_isItemEnabled = SunToolkit.getMethod(MenuItem.class, "isItemEnabled", null);

    }

    /************************************************

     *

     * Text Metrics

     *

     ************************************************/

    /**

     * Text metrics are filled in calcTextMetrics function

     * and reset in resetTextMetrics function. Text metrics

     * contain calculated dimensions of various components of

     * menu item.

     */

    private TextMetrics textMetrics;

    static class TextMetrics implements Cloneable {

        /*

         * Calculated text size members

         */

        private Dimension textDimension;

        private int shortcutWidth;

        private int textBaseline;

        TextMetrics(Dimension textDimension, int shortcutWidth, int textBaseline) {

            this.textDimension = textDimension;

            this.shortcutWidth = shortcutWidth;

            this.textBaseline = textBaseline;

        }

        public Object clone() {

            try {

                return super.clone();

            } catch (CloneNotSupportedException ex) {

                throw new InternalError();

            }

        }

        Dimension getTextDimension() {

            return this.textDimension;

        }

        int getShortcutWidth() {

            return this.shortcutWidth;

        }

        int getTextBaseline() {

            return this.textBaseline;

        }

    }

    /************************************************

     *

     * Construction

     *

     ************************************************/

    XMenuItemPeer(MenuItem target) {

        this.target = target;

    }

    /************************************************

     *

     * Implementaion of interface methods

     *

     ************************************************/

    /*

     * From MenuComponentPeer

     */

    public void dispose() {

        //Empty function

    }

    public void setFont(Font font) {

        resetTextMetrics();

        repaintIfShowing();

    }

    /*

     * From MenuItemPeer

     */

    public void setLabel(String label) {

        resetTextMetrics();

        repaintIfShowing();

    }

    public void setEnabled(boolean enabled) {

        repaintIfShowing();

    }

    /**

     * DEPRECATED:  Replaced by setEnabled(boolean).

     * @see java.awt.peer.MenuItemPeer

     */

    public void enable() {

        setEnabled( true );

    }

    /**

     * DEPRECATED:  Replaced by setEnabled(boolean).

     * @see java.awt.peer.MenuItemPeer

     */

    public void disable() {

        setEnabled( false );

    }

    /************************************************

     *

     * Access to target's fields

     *

     ************************************************/

    MenuItem getTarget() {

        return this.target;

    }

    Font getTargetFont() {

        if (target == null) {

            return XWindow.getDefaultFont();

        }

        try {

            return (Font)m_getFont.invoke(target, new Object[0]);

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        } catch (InvocationTargetException e) {

            e.printStackTrace();

        }

        return XWindow.getDefaultFont();

    }

    String getTargetLabel() {

        if (target == null) {

            return "";

        }

        try {

            String label = (String)f_label.get(target);

            return (label == null) ? "" : label;

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        }

        return "";

    }

    boolean isTargetEnabled() {

        if (target == null) {

            return false;

        }

        try {

            return f_enabled.getBoolean(target);

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        }

        return false;

    }

    /**

     * Returns true if item and all its parents are enabled

     * This function is used to fix

     * 6184485: Popup menu is not disabled on XToolkit even when calling setEnabled (false)

     */

    boolean isTargetItemEnabled() {

        if (target == null) {

            return false;

        }

        try {

            return ((Boolean)m_isItemEnabled.invoke(target, new Object[0])).booleanValue();

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        } catch (InvocationTargetException e) {

            e.printStackTrace();

        }

        return false;

    }

    String getTargetActionCommand() {

        if (target == null) {

            return "";

        }

        try {

            return (String) m_getActionCommand.invoke(target,(Object[]) null);

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        } catch (InvocationTargetException e) {

            e.printStackTrace();

        }

        return "";

    }

    MenuShortcut getTargetShortcut() {

        if (target == null) {

            return null;

        }

        try {

            return (MenuShortcut)f_shortcut.get(target);

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        }

        return null;

    }

    String getShortcutText() {

        //Fix for 6180413: shortcuts should not be displayed for any of the menuitems in a popup menu

        if (container == null) {

            return null;

        }

        if (container.getRootMenuWindow() instanceof XPopupMenuPeer) {

            return null;

        }

        MenuShortcut sc = getTargetShortcut();

        //TODO:This can potentially call user code

        return (sc == null) ? null : sc.toString();

    }

    /************************************************

     *

     * Basic manipulations

     *

     ************************************************/

    /**

     * This function is called when filling item vectors

     * in XMenuWindow & XMenuBar. We need it because peers

     * are created earlier than windows.

     * @param container the window that this item belongs to.

     */

    void setContainer(XBaseMenuWindow container) {

        synchronized(XBaseMenuWindow.getMenuTreeLock()) {

            this.container = container;

        }

    }

    /**

     * returns the window that this item belongs to

     */

    XBaseMenuWindow getContainer() {

        return this.container;

    }

    /************************************************

     *

     * Overridable behaviour

     *

     ************************************************/

    /**

     * This function should be overriden simply to

     * return false in inherited classes.

     */

    boolean isSeparator() {

        boolean r = (getTargetLabel().equals("-"));

        return r;

    }

    /************************************************

     *

     * Utility functions

     *

     ************************************************/

    /**

     * Returns true if container exists and is showing

     */

    boolean isContainerShowing() {

        if (container == null) {

            return false;

        }

        return container.isShowing();

    }

    /**

     * Repaints item if it is showing

     */

    void repaintIfShowing() {

        if (isContainerShowing()) {

            container.postPaintEvent();

        }

    }

    /**

     * This function is invoked when the user clicks

     * on menu item.

     * @param when the timestamp of action event

     */

    void action(long when) {

        if (!isSeparator() && isTargetItemEnabled()) {

            XWindow.postEventStatic(new ActionEvent(target, ActionEvent.ACTION_PERFORMED,

                                                    getTargetActionCommand(), when,

                                                    0));

        }

    }

    /************************************************

     *

     * Text metrics

     *

     ************************************************/

    /**

     * Returns text metrics of menu item.

     * This function does not use any locks

     * and is guaranteed to return some value

     * (possibly actual, possibly expired)

     */

    TextMetrics getTextMetrics() {

        TextMetrics textMetrics = this.textMetrics;

        if (textMetrics == null) {

            textMetrics = calcTextMetrics();

            this.textMetrics = textMetrics;

        }

        return textMetrics;

    }

    /**

     * Returns dimensions of item's label.

     * This function does not use any locks

     * Returns actual or expired  value

     * or null if error occurs

     */

    /*Dimension getTextDimension() {

        TextMetrics textMetrics = this.textMetrics;

        if (textMetrics == null) {

            textMetrics = calcTextMetrics();

            this.textMetrics = textMetrics;

        }

        return (textMetrics != null) ? textMetrics.textDimension : null;

        }*/

    /**

     * Returns width of item's shortcut label,

     * 0 if item has no shortcut.

     * The height of shortcut can be deternimed

     * from text dimensions.

     * This function does not use any locks

     * and is guaranteed to return some value

     * (possibly actual, possibly expired)

     */

    /*int getShortcutWidth() {

        TextMetrics textMetrics = this.textMetrics;

        if (textMetrics == null) {

            textMetrics = calcTextMetrics();

            this.textMetrics = textMetrics;

        }

        return (textMetrics != null) ? textMetrics.shortcutWidth : 0;

    }

    int getTextBaseline() {

        TextMetrics textMetrics = this.textMetrics;

        if (textMetrics == null) {

            textMetrics = calcTextMetrics();

            this.textMetrics = textMetrics;

        }

        return (textMetrics != null) ? textMetrics.textBaseline : 0;

        }*/

    TextMetrics calcTextMetrics() {

        if (container == null) {

            return null;

        }

        if (isSeparator()) {

            return new TextMetrics(new Dimension(SEPARATOR_WIDTH, SEPARATOR_HEIGHT), 0, 0);

        }

        Graphics g = container.getGraphics();

        if (g == null) {

            return null;

        }

        try {

            g.setFont(getTargetFont());

            FontMetrics fm = g.getFontMetrics();

            String str = getTargetLabel();

            int width = fm.stringWidth(str);

            int height = fm.getHeight();

            Dimension textDimension = new Dimension(width, height);

            int textBaseline = fm.getHeight() - fm.getAscent();

            String sc = getShortcutText();

            int shortcutWidth = (sc == null) ? 0 : fm.stringWidth(sc);

            return new TextMetrics(textDimension, shortcutWidth, textBaseline);

        } finally {

            g.dispose();

        }

    }

    void resetTextMetrics() {

        textMetrics = null;

        if (container != null) {

            container.updateSize();

        }

    }

    /************************************************

     *

     * Mapping utility functions

     *

     ************************************************/

    /**

     * Sets mapping of item to window.

     * @param bounds bounds of item in container's coordinates

     * @param textOrigin point for drawString in container's coordinates

     * @see XBaseMenuWindow.map()

     */

    void map(Rectangle bounds, Point textOrigin) {

        this.bounds = bounds;

        this.textOrigin = textOrigin;

    }

    /**

     * returns bounds of item that were previously set by map() function

     */

    Rectangle getBounds() {

        return bounds;

    }

    /**

     * returns origin of item's text that was previously set by map() function

     */

    Point getTextOrigin() {

        return textOrigin;

    }

}