/*

 * 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.lang.reflect.Field;

import java.lang.reflect.Method;

import java.lang.reflect.InvocationTargetException;

import java.util.Vector;

import sun.awt.SunToolkit;

public class XPopupMenuPeer extends XMenuWindow implements PopupMenuPeer {

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

     *

     * Data members

     *

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

    /*

     * Primary members

     */

    private XComponentPeer componentPeer;

    private PopupMenu popupMenuTarget;

    /*

     * If mouse button is clicked on item showing submenu

     * we have to hide its submenu.

     * This member saves the submenu under cursor

     * Only if it's showing

     */

    private XMenuPeer showingMousePressedSubmenu = null;

    /*

     * Painting constants

     */

    private final static int CAPTION_MARGIN_TOP = 4;

    private final static int CAPTION_SEPARATOR_HEIGHT = 6;

    /*

     * Menu's fields & methods

     */

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

    private final static Field f_enabled;

    //Fix for 6267144: PIT: Popup menu label is not shown, XToolkit

    private final static Field f_label;

    private final static Method m_getFont;

    private final static Field f_items;

    static {

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

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

        f_items = SunToolkit.getField(Menu.class, "items");

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

    }

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

     *

     * Construction

     *

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

    XPopupMenuPeer(PopupMenu target) {

        super(null);

        this.popupMenuTarget = target;

    }

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

     *

     * Implementaion of interface methods

     *

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

    /*

     * From MenuComponentPeer

     */

    public void setFont(Font f) {

        resetMapping();

        setItemsFont(f);

        postPaintEvent();

    }

    /*

     * From MenuItemPeer

     */

    public void setLabel(String label) {

        resetMapping();

        postPaintEvent();

    }

    public void setEnabled(boolean enabled) {

        postPaintEvent();

    }

    /**

     * 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 );

    }

    /*

     * From MenuPeer

     */

    /**

     * addSeparator routines are not used

     * in peers. Shared code invokes addItem("-")

     * for adding separators

     */

    public void addSeparator() {

    }

    /*

     * From PopupMenuPeer

     */

    public void show(Event e) {

        target = (Component)e.target;

        // Get menus from the target.

        Vector targetItemVector = getMenuTargetItems();

        if (targetItemVector != null) {

            reloadItems(targetItemVector);

            //Fix for 6287092: JCK15a: api/java_awt/interactive/event/EventTests.html#EventTest0015 fails, mustang

            Point tl = target.getLocationOnScreen();

            Point pt = new Point(tl.x + e.x, tl.y + e.y);

            //Fixed 6266513: Incorrect key handling in XAWT popup menu

            //No item should be selected when showing popup menu

            if (!ensureCreated()) {

                return;

            }

            Dimension dim = getDesiredSize();

            //Fix for 6267162: PIT: Popup Menu gets hidden below the screen when opened

            //near the periphery of the screen, XToolkit

            Rectangle bounds = getWindowBounds(pt, dim);

            reshape(bounds);

            xSetVisible(true);

            toFront();

            selectItem(null, false);

            grabInput();

        }

    }

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

     *

     * Access to target's fields

     *

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

    //Fix for 6267144: PIT: Popup menu label is not shown, XToolkit

    Font getTargetFont() {

        if (popupMenuTarget == null) {

            return XWindow.getDefaultFont();

        }

        try {

            return (Font)m_getFont.invoke(popupMenuTarget, 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(popupMenuTarget);

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

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        }

        return "";

    }

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

    boolean isTargetEnabled() {

        if (popupMenuTarget == null) {

            return false;

        }

        try {

            return f_enabled.getBoolean(popupMenuTarget);

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        }

        return false;

    }

    Vector getMenuTargetItems() {

        try {

            return (Vector)f_items.get(popupMenuTarget);

        } catch (IllegalAccessException iae) {

            iae.printStackTrace();

            return null;

        }

    }

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

     *

     * Utility functions

     *

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

    //Fix for 6267162: PIT: Popup Menu gets hidden below the screen when opened

    //near the periphery of the screen, XToolkit

    /**

     * Calculates placement of popup menu window

     * given origin in global coordinates and

     * size of menu window. Returns suggested

     * rectangle for menu window in global coordinates

     * @param origin the origin point specified in show()

     * function converted to global coordinates

     * @param windowSize the desired size of menu's window

     */

    protected Rectangle getWindowBounds(Point origin, Dimension windowSize) {

        Rectangle globalBounds = new Rectangle(origin.x, origin.y, 0, 0);

        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

        Rectangle res;

        res = fitWindowRight(globalBounds, windowSize, screenSize);

        if (res != null) {

            return res;

        }

        res = fitWindowLeft(globalBounds, windowSize, screenSize);

        if (res != null) {

            return res;

        }

        res = fitWindowBelow(globalBounds, windowSize, screenSize);

        if (res != null) {

            return res;

        }

        res = fitWindowAbove(globalBounds, windowSize, screenSize);

        if (res != null) {

            return res;

        }

        return fitWindowToScreen(windowSize, screenSize);

   }

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

     *

     * Overriden XMenuWindow caption-painting functions

     * Necessary to fix 6267144: PIT: Popup menu label is not shown, XToolkit

     *

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

    /**

     * Returns height of menu window's caption.

     * Can be overriden for popup menus and tear-off menus

     */

    protected Dimension getCaptionSize() {

        String s = getTargetLabel();

        if (s.equals("")) {

            return null;

        }

        Graphics g = getGraphics();

        if (g == null) {

            return null;

        }

        try {

            g.setFont(getTargetFont());

            FontMetrics fm = g.getFontMetrics();

            String str = getTargetLabel();

            int width = fm.stringWidth(str);

            int height = CAPTION_MARGIN_TOP + fm.getHeight() + CAPTION_SEPARATOR_HEIGHT;

            Dimension textDimension = new Dimension(width, height);

            return textDimension;

        } finally {

            g.dispose();

        }

    }

    /**

     * Paints menu window's caption.

     * Can be overriden for popup menus and tear-off menus.

     * Default implementation does nothing

     */

    protected void paintCaption(Graphics g, Rectangle rect) {

        String s = getTargetLabel();

        if (s.equals("")) {

            return;

        }

        g.setFont(getTargetFont());

        FontMetrics fm = g.getFontMetrics();

        String str = getTargetLabel();

        int width = fm.stringWidth(str);

        int textx = rect.x + (rect.width - width) / 2;

        int texty = rect.y + CAPTION_MARGIN_TOP + fm.getAscent();

        int sepy = rect.y + rect.height - CAPTION_SEPARATOR_HEIGHT / 2;

        g.setColor(isTargetEnabled() ? getForegroundColor() : getDisabledColor());

        g.drawString(s, textx, texty);

        draw3DRect(g, rect.x, sepy,  rect.width, 2, false);

    }

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

     *

     * Overriden XBaseMenuWindow functions

     *

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

    protected void doDispose() {

        super.doDispose();

        XToolkit.targetDisposedPeer(popupMenuTarget, this);

    }

    protected void handleEvent(AWTEvent event) {

        switch(event.getID()) {

        case MouseEvent.MOUSE_PRESSED:

        case MouseEvent.MOUSE_RELEASED:

        case MouseEvent.MOUSE_CLICKED:

        case MouseEvent.MOUSE_MOVED:

        case MouseEvent.MOUSE_ENTERED:

        case MouseEvent.MOUSE_EXITED:

        case MouseEvent.MOUSE_DRAGGED:

            doHandleJavaMouseEvent((MouseEvent)event);

            break;

        case KeyEvent.KEY_PRESSED:

        case KeyEvent.KEY_RELEASED:

            doHandleJavaKeyEvent((KeyEvent)event);

            break;

        default:

            super.handleEvent(event);

            break;

        }

    }

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

     *

     * Overriden XWindow general-purpose functions

     *

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

    void ungrabInputImpl() {

        hide();

    }

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

     *

     * Overriden XWindow keyboard processing

     *

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

    /*

     * In previous version keys were handled in handleKeyPress.

     * Now we override this function do disable F10 explicit

     * processing. All processing is done using KeyEvent.

     */

    public void handleKeyPress(XEvent xev) {

        XKeyEvent xkey = xev.get_xkey();

            log.fine(xkey.toString());

        }

        if (isEventDisabled(xev)) {

            return;

        }

        final Component currentSource = (Component)getEventSource();

        handleKeyPress(xkey);

    }

}