/*******************************************************************************
 * Copyright (c) 2000, 2007 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     
 * Port to the D programming language:
 *     Jacob Carlborg <jacob.carlborg@gmail.com>
 *******************************************************************************/
module dwt.widgets.MenuItem;


import dwt.DWT;
import dwt.DWTException;
import dwt.events.ArmListener;
import dwt.events.HelpListener;
import dwt.events.SelectionEvent;
import dwt.events.SelectionListener;
import dwt.graphics.Image;
import dwt.internal.cocoa.NSMenu;
import dwt.internal.cocoa.NSMenuItem;
import dwt.internal.cocoa.NSString;
import dwt.internal.cocoa.OS;
import dwt.internal.cocoa.SWTMenu;

import dwt.dwthelper.utils;
import dwt.internal.cocoa.NSInteger;
import dwt.widgets.Decorations;
import dwt.widgets.Display;
import dwt.widgets.Event;
import dwt.widgets.Item;
import dwt.widgets.Menu;
import dwt.widgets.TypedListener;

/**
 * Instances of this class represent a selectable user interface object
 * that issues notification when pressed and released. 
 * <dl>
 * <dt><b>Styles:</b></dt>
 * <dd>CHECK, CASCADE, PUSH, RADIO, SEPARATOR</dd>
 * <dt><b>Events:</b></dt>
 * <dd>Arm, Help, Selection</dd>
 * </dl>
 * <p>
 * Note: Only one of the styles CHECK, CASCADE, PUSH, RADIO and SEPARATOR
 * may be specified.
 * </p><p>
 * IMPORTANT: This class is <em>not</em> intended to be subclassed.
 * </p>
 */
public class MenuItem : Item {
    NSMenuItem nsItem;
    Menu parent, menu;
    int accelerator;
//  int x, y, width, height;

/**
 * Constructs a new instance of this class given its parent
 * (which must be a <code>Menu</code>) and a style value
 * describing its behavior and appearance. The item is added
 * to the end of the items maintained by its parent.
 * <p>
 * The style value is either one of the style constants defined in
 * class <code>DWT</code> which is applicable to instances of this
 * class, or must be built by <em>bitwise OR</em>'ing together 
 * (that is, using the <code>int</code> "|" operator) two or more
 * of those <code>DWT</code> style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * </p>
 *
 * @param parent a menu control which will be the parent of the new instance (cannot be null)
 * @param style the style of control to construct
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 *
 * @see DWT#CHECK
 * @see DWT#CASCADE
 * @see DWT#PUSH
 * @see DWT#RADIO
 * @see DWT#SEPARATOR
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public this (Menu parent, int style) {
    super (parent, checkStyle (style));
    this.parent = parent;
    parent.createItem (this, parent.getItemCount ());
}

/**
 * Constructs a new instance of this class given its parent
 * (which must be a <code>Menu</code>), a style value
 * describing its behavior and appearance, and the index
 * at which to place it in the items maintained by its parent.
 * <p>
 * The style value is either one of the style constants defined in
 * class <code>DWT</code> which is applicable to instances of this
 * class, or must be built by <em>bitwise OR</em>'ing together 
 * (that is, using the <code>int</code> "|" operator) two or more
 * of those <code>DWT</code> style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * </p>
 *
 * @param parent a menu control which will be the parent of the new instance (cannot be null)
 * @param style the style of control to construct
 * @param index the zero-relative index to store the receiver in its parent
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
 *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 *
 * @see DWT#CHECK
 * @see DWT#CASCADE
 * @see DWT#PUSH
 * @see DWT#RADIO
 * @see DWT#SEPARATOR
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public this (Menu parent, int style, int index) {
    super (parent, checkStyle (style));
    this.parent = parent;
    parent.createItem (this, index);
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when the arm events are generated for the control, by sending
 * it one of the messages defined in the <code>ArmListener</code>
 * interface.
 *
 * @param listener the listener which should be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see ArmListener
 * @see #removeArmListener
 */
public void addArmListener (ArmListener listener) {
    checkWidget ();
    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
    TypedListener typedListener = new TypedListener (listener);
    addListener (DWT.Arm, typedListener);
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when the help events are generated for the control, by sending
 * it one of the messages defined in the <code>HelpListener</code>
 * interface.
 *
 * @param listener the listener which should be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see HelpListener
 * @see #removeHelpListener
 */
public void addHelpListener (HelpListener listener) {
    checkWidget ();
    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
    TypedListener typedListener = new TypedListener (listener);
    addListener (DWT.Help, typedListener);
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when the menu item is selected by the user, by sending
 * it one of the messages defined in the <code>SelectionListener</code>
 * interface.
 * <p>
 * When <code>widgetSelected</code> is called, the stateMask field of the event object is valid.
 * <code>widgetDefaultSelected</code> is not called.
 * </p>
 *
 * @param listener the listener which should be notified when the menu item is selected by the user
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see SelectionListener
 * @see #removeSelectionListener
 * @see SelectionEvent
 */
public void addSelectionListener (SelectionListener listener) {
    checkWidget ();
    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
    TypedListener typedListener = new TypedListener(listener);
    addListener (DWT.Selection,typedListener);
    addListener (DWT.DefaultSelection,typedListener);
}

protected void checkSubclass () {
    if (!isValidSubclass ()) error (DWT.ERROR_INVALID_SUBCLASS);
}

static int checkStyle (int style) {
    return checkBits (style, DWT.PUSH, DWT.CHECK, DWT.RADIO, DWT.SEPARATOR, DWT.CASCADE, 0);
}

NSMenu createEmptyMenu () {
    if ((parent.style & DWT.BAR) !is 0) {
        return cast(NSMenu) (new SWTMenu ()).alloc ().init ();
    }
    return null;
}

void destroyWidget () {
    parent.destroyItem (this);
    releaseHandle ();
}

/**
 * Returns the widget accelerator.  An accelerator is the bit-wise
 * OR of zero or more modifier masks and a key. Examples:
 * <code>DWT.CONTROL | DWT.SHIFT | 'T', DWT.ALT | DWT.F2</code>.
 * The default value is zero, indicating that the menu item does
 * not have an accelerator.
 *
 * @return the accelerator or 0
 *
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public int getAccelerator () {
    checkWidget ();
    return accelerator;
}

/**
 * Returns <code>true</code> if the receiver is enabled, and
 * <code>false</code> otherwise. A disabled menu item is typically
 * not selectable from the user interface and draws with an
 * inactive or "grayed" look.
 *
 * @return the receiver's enabled state
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @see #isEnabled
 */
public bool getEnabled () {
    checkWidget();
    return (state & DISABLED) is 0;
}

/**
 * Returns the receiver's cascade menu if it has one or null
 * if it does not. Only <code>CASCADE</code> menu items can have
 * a pull down menu. The sequence of key strokes, button presses 
 * and/or button releases that are used to request a pull down
 * menu is platform specific.
 *
 * @return the receiver's menu
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public Menu getMenu () {
    checkWidget ();
    return menu;
}

String getNameText () {
    if ((style & DWT.SEPARATOR) !is 0) return "|";
    return super.getNameText ();
}

/**
 * Returns the receiver's parent, which must be a <code>Menu</code>.
 *
 * @return the receiver's parent
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public Menu getParent () {
    checkWidget ();
    return parent;
}

/**
 * Returns <code>true</code> if the receiver is selected,
 * and false otherwise.
 * <p>
 * When the receiver is of type <code>CHECK</code> or <code>RADIO</code>,
 * it is selected when it is checked.
 *
 * @return the selection state
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public bool getSelection () {
    checkWidget ();
    if ((style & (DWT.CHECK | DWT.RADIO)) is 0) return false;
    return (cast(NSMenuItem)nsItem).state() is OS.NSOnState;
}

//int kEventProcessCommand (int nextHandler, int theEvent, int userData) {
//  //TEMPORARY CODE
//  if (!isEnabled ()) return OS.noErr;
//
//  if ((style & DWT.CHECK) !is 0) {
//      setSelection (!getSelection ());
//  } else {
//      if ((style & DWT.RADIO) !is 0) {
//          if ((parent.getStyle () & DWT.NO_RADIO_GROUP) !is 0) {
//              setSelection (!getSelection ());
//          } else {
//              selectRadio ();
//          }
//      }
//  }
//  int [] modifiers = new int [1];
//  OS.GetEventParameter (theEvent, OS.kEventParamKeyModifiers, OS.typeUInt32, null, 4, null, modifiers);
//  Event event = new Event ();
//  setInputState (event, cast(short) 0, OS.GetCurrentEventButtonState (), modifiers [0]);
//  postEvent (DWT.Selection, event);
//  return OS.noErr;
//}

/**
 * Returns <code>true</code> if the receiver is enabled and all
 * of the receiver's ancestors are enabled, and <code>false</code>
 * otherwise. A disabled menu item is typically not selectable from the
 * user interface and draws with an inactive or "grayed" look.
 *
 * @return the receiver's enabled state
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @see #getEnabled
 */
public bool isEnabled () {
    return getEnabled () && parent.isEnabled ();
}

//int keyGlyph (int key) {
//  switch (key) {
//      case DWT.BS: return OS.kMenuDeleteLeftGlyph;
//      case DWT.CR: return OS.kMenuReturnGlyph;
//      case DWT.DEL: return OS.kMenuDeleteRightGlyph;
//      case DWT.ESC: return OS.kMenuEscapeGlyph;
//      case DWT.LF: return OS.kMenuReturnGlyph;
//      case DWT.TAB: return OS.kMenuTabRightGlyph;
//      case ' ': return OS.kMenuBlankGlyph;
////        case ' ': return OS.kMenuSpaceGlyph;
//      case DWT.ALT: return OS.kMenuOptionGlyph;
//      case DWT.SHIFT: return OS.kMenuShiftGlyph;
//      case DWT.CONTROL: return OS.kMenuControlISOGlyph;
//      case DWT.COMMAND: return OS.kMenuCommandGlyph;
//      case DWT.ARROW_UP: return OS.kMenuUpArrowGlyph;
//      case DWT.ARROW_DOWN: return OS.kMenuDownArrowGlyph;
//      case DWT.ARROW_LEFT: return OS.kMenuLeftArrowGlyph;
//      case DWT.ARROW_RIGHT: return OS.kMenuRightArrowGlyph;
//      case DWT.PAGE_UP: return OS.kMenuPageUpGlyph;
//      case DWT.PAGE_DOWN: return OS.kMenuPageDownGlyph;
//      case DWT.F1: return OS.kMenuF1Glyph;
//      case DWT.F2: return OS.kMenuF2Glyph;
//      case DWT.F3: return OS.kMenuF3Glyph;
//      case DWT.F4: return OS.kMenuF4Glyph;
//      case DWT.F5: return OS.kMenuF5Glyph;
//      case DWT.F6: return OS.kMenuF6Glyph;
//      case DWT.F7: return OS.kMenuF7Glyph;
//      case DWT.F8: return OS.kMenuF8Glyph;
//      case DWT.F9: return OS.kMenuF9Glyph;
//      case DWT.F10: return OS.kMenuF10Glyph;
//      case DWT.F11: return OS.kMenuF11Glyph;
//      case DWT.F12: return OS.kMenuF12Glyph;
//  }
//  return OS.kMenuNullGlyph;
//}

void releaseHandle () {
    super.releaseHandle ();
    if (nsItem !is null) nsItem.release();
    nsItem = null;
    parent = null;
}

void releaseChildren (bool destroy) {
    if (menu !is null) {
        menu.release (false);
        menu = null;
    }
    super.releaseChildren (destroy);
}

void releaseWidget () {
    super.releaseWidget ();
    accelerator = 0;
    if (this is parent.defaultItem) parent.defaultItem = null;
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the arm events are generated for the control.
 *
 * @param listener the listener which should no longer be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see ArmListener
 * @see #addArmListener
 */
public void removeArmListener (ArmListener listener) {
    checkWidget ();
    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
    if (eventTable is null) return;
    eventTable.unhook (DWT.Arm, listener);
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the help events are generated for the control.
 *
 * @param listener the listener which should no longer be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see HelpListener
 * @see #addHelpListener
 */
public void removeHelpListener (HelpListener listener) {
    checkWidget ();
    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
    if (eventTable is null) return;
    eventTable.unhook (DWT.Help, listener);
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the control is selected by the user.
 *
 * @param listener the listener which should no longer be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see SelectionListener
 * @see #addSelectionListener
 */
public void removeSelectionListener (SelectionListener listener) {
    checkWidget ();
    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
    if (eventTable is null) return;
    eventTable.unhook (DWT.Selection, listener);
    eventTable.unhook (DWT.DefaultSelection,listener);  
}

void selectRadio () {
    int index = 0;
    MenuItem [] items = parent.getItems ();
    while (index < items.length && items [index] !is this) index++;
    int i = index - 1;
    while (i >= 0 && items [i].setRadioSelection (false)) --i;
    int j = index + 1;
    while (j < items.length && items [j].setRadioSelection (false)) j++;
    setSelection (true);
}

void sendSelection () {
    if ((style & DWT.CHECK) !is 0) {
        setSelection (!getSelection ());
    } else {
        if ((style & DWT.RADIO) !is 0) {
            if ((parent.getStyle () & DWT.NO_RADIO_GROUP) !is 0) {
                setSelection (!getSelection ());
            } else {
                selectRadio ();
            }
        }
    }
    Event event = new Event ();
    //TODO state mask
//  setInputState (event, cast(short) 0, OS.GetCurrentEventButtonState (), modifiers [0]);
    postEvent (DWT.Selection, event);
}

/**
 * Sets the widget accelerator.  An accelerator is the bit-wise
 * OR of zero or more modifier masks and a key. Examples:
 * <code>DWT.MOD1 | DWT.MOD2 | 'T', DWT.MOD3 | DWT.F2</code>.
 * <code>DWT.CONTROL | DWT.SHIFT | 'T', DWT.ALT | DWT.F2</code>.
 * The default value is zero, indicating that the menu item does
 * not have an accelerator.
 *
 * @param accelerator an integer that is the bit-wise OR of masks and a key
 *
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setAccelerator (int accelerator) {
    checkWidget ();
    this.accelerator = accelerator;
    int key = accelerator & DWT.KEY_MASK;
    int virtualKey = Display.untranslateKey (key);
    NSString str =  null;
    if (virtualKey !is 0) {
        str = NSString.stringWith (Integer.toString(virtualKey));
    } else {
        str = NSString.stringWith (Integer.toString(key)).lowercaseString();
    }
    nsItem.setKeyEquivalent (string);
    int mask = 0;
    if ((accelerator & DWT.SHIFT) !is 0) mask |= OS.NSShiftKeyMask;
    if ((accelerator & DWT.CONTROL) !is 0) mask |= OS.NSControlKeyMask;
//  if ((accelerator & DWT.COMMAND) !is 0) mask &= ~OS.kMenuNoCommandModifier;
    if ((accelerator & DWT.COMMAND) !is 0) mask |= OS.NSCommandKeyMask;
    if ((accelerator & DWT.ALT) !is 0) mask |= OS.NSAlternateKeyMask;
    nsItem.setKeyEquivalentModifierMask (cast(NSUInteger) mask);
    if ((this.accelerator is 0 && accelerator !is 0) || (this.accelerator !is 0 && accelerator is 0)) {
        updateText ();
    }
}

/**
 * Enables the receiver if the argument is <code>true</code>,
 * and disables it otherwise. A disabled menu item is typically
 * not selectable from the user interface and draws with an
 * inactive or "grayed" look.
 *
 * @param enabled the new enabled state
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setEnabled (bool enabled) {
    checkWidget ();
    (cast(NSMenuItem)nsItem).setEnabled(enabled);
}

/**
 * Sets the image the receiver will display to the argument.
 * <p>
 * Note: This operation is a hint and is not supported on
 * platforms that do not have this concept (for example, Windows NT).
 * </p>
 *
 * @param image the image to display
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setImage (Image image) {
    checkWidget ();
    if ((style & DWT.SEPARATOR) !is 0) return;
    super.setImage (image);
    (cast(NSMenuItem)nsItem).setImage(image !is null? image.handle : null);
}

/**
 * Sets the receiver's pull down menu to the argument.
 * Only <code>CASCADE</code> menu items can have a
 * pull down menu. The sequence of key strokes, button presses
 * and/or button releases that are used to request a pull down
 * menu is platform specific.
 * <p>
 * Note: Disposing of a menu item that has a pull down menu
 * will dispose of the menu.  To avoid this behavior, set the
 * menu to null before the menu item is disposed.
 * </p>
 *
 * @param menu the new pull down menu
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_MENU_NOT_DROP_DOWN - if the menu is not a drop down menu</li>
 *    <li>ERROR_MENUITEM_NOT_CASCADE - if the menu item is not a <code>CASCADE</code></li>
 *    <li>ERROR_INVALID_ARGUMENT - if the menu has been disposed</li>
 *    <li>ERROR_INVALID_PARENT - if the menu is not in the same widget tree</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setMenu (Menu menu) {
    checkWidget ();

    /* Check to make sure the new menu is valid */
    if ((style & DWT.CASCADE) is 0) {
        error (DWT.ERROR_MENUITEM_NOT_CASCADE);
    }
    if (menu !is null) {
        if (menu.isDisposed()) error(DWT.ERROR_INVALID_ARGUMENT);
        if ((menu.style & DWT.DROP_DOWN) is 0) {
            error (DWT.ERROR_MENU_NOT_DROP_DOWN);
        }
        if (menu.parent !is parent.parent) {
            error (DWT.ERROR_INVALID_PARENT);
        }
    } 
    /* Assign the new menu */
    Menu oldMenu = this.menu;
    if (oldMenu is menu) return;
    if (oldMenu !is null) oldMenu.cascade = null;
    this.menu = menu;
    
    /* Update the menu in the OS */
    NSMenu menuHandle;
    if (menu is null) {
        menuHandle = createEmptyMenu ();
    } else {
        menu.cascade = this;
        menuHandle = menu.nsMenu;
    }
    nsItem.setSubmenu (menuHandle);
    
    /* Update menu title with parent item title */
    updateText ();
}

bool setRadioSelection (bool value) {
    if ((style & DWT.RADIO) is 0) return false;
    if (getSelection () !is value) {
        setSelection (value);
        postEvent (DWT.Selection);
    }
    return true;
}

/**
 * Sets the selection state of the receiver.
 * <p>
 * When the receiver is of type <code>CHECK</code> or <code>RADIO</code>,
 * it is selected when it is checked.
 *
 * @param selected the new selection state
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setSelection (bool selected) {
    checkWidget ();
    if ((style & (DWT.CHECK | DWT.RADIO)) is 0) return;
    (cast(NSMenuItem)nsItem).setState(selected ? OS.NSOnState : OS.NSOffState);
}

/**
 * Sets the receiver's text. The string may include
 * the mnemonic character and accelerator text.
 * <p>
 * Mnemonics are indicated by an '&amp;' that causes the next
 * character to be the mnemonic.  When the user presses a
 * key sequence that matches the mnemonic, a selection
 * event occurs. On most platforms, the mnemonic appears
 * underlined but may be emphasised in a platform specific
 * manner.  The mnemonic indicator character '&amp;' can be
 * escaped by doubling it in the string, causing a single
 * '&amp;' to be displayed.
 * </p>
 * <p>
 * Accelerator text is indicated by the '\t' character.
 * On platforms that support accelerator text, the text
 * that follows the '\t' character is displayed to the user,
 * typically indicating the key stroke that will cause
 * the item to become selected.  On most platforms, the
 * accelerator text appears right aligned in the menu.
 * Setting the accelerator text does not install the
 * accelerator key sequence. The accelerator key sequence
 * is installed using #setAccelerator.
 * </p>
 * 
 * @param string the new text
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the text is null</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @see #setAccelerator
 */
public void setText (String string) {
    checkWidget ();
    if (string is null) error (DWT.ERROR_NULL_ARGUMENT);
    if ((style & DWT.SEPARATOR) !is 0) return;
    if (text.equals (string)) return;
    super.setText (string);
    updateText ();
}
    
void updateText() {
    char [] buffer = new char [text.length ()];
    text.getChars (0, buffer.length, buffer, 0);
    int i=0, j=0;
    while (i < buffer.length) {
        if (buffer [i] is '\t') break;
        if ((buffer [j++] = buffer [i++]) is '&') {
            if (i is buffer.length) {continue;}
            if (buffer [i] is '&') {i++; continue;}
            j--;
        }
    }
    String text = new_String (buffer, 0, j);
    NSMenu submenu = nsItem.submenu ();
    NSString label = NSString.stringWith (text);
    if(submenu !is null && (parent.getStyle () & DWT.BAR) !is 0) {
        submenu.setTitle (label);
    } else {
        nsItem.setTitle (label);
    }
}

}