bundles/org.eclipse.swt/Eclipse SWT/carbon/org/eclipse/swt/widgets/MenuItem.java

package org.eclipse.swt.widgets;

/*
 * Copyright (c) 2000, 2002 IBM Corp.  All rights reserved.
 * This file is made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 */

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.internal.carbon.*;

/**
 * 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 extends Item {
	Menu parent, menu;
	int id, accelerator;
	int cIconHandle;

/**
 * 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>SWT</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>SWT</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 SWTException <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 SWT#CHECK
 * @see SWT#CASCADE
 * @see SWT#PUSH
 * @see SWT#RADIO
 * @see SWT#SEPARATOR
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public MenuItem (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>SWT</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>SWT</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 index to store the receiver in its parent
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
 * </ul>
 * @exception SWTException <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 SWT#CHECK
 * @see SWT#CASCADE
 * @see SWT#PUSH
 * @see SWT#RADIO
 * @see SWT#SEPARATOR
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public MenuItem (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 SWTException <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 == null) error (SWT.ERROR_NULL_ARGUMENT);
	TypedListener typedListener = new TypedListener (listener);
	addListener (SWT.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 SWTException <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 == null) error (SWT.ERROR_NULL_ARGUMENT);
	TypedListener typedListener = new TypedListener (listener);
	addListener (SWT.Help, typedListener);
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when the control is selected, 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
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception SWTException <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 == null) error (SWT.ERROR_NULL_ARGUMENT);
	TypedListener typedListener = new TypedListener(listener);
	addListener (SWT.Selection,typedListener);
	addListener (SWT.DefaultSelection,typedListener);
}

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

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

/**
 * Return the widget accelerator.  An accelerator is the bit-wise
 * OR of zero or more modifier masks and a key. Examples:
 * <code>SWT.CONTROL | SWT.SHIFT | 'T', SWT.ALT | SWT.F2</code>.
 *
 * @return the accelerator
 *
 * </ul>
 * @exception SWTException <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;
}

public Display getDisplay () {
	Menu parent = this.parent;
	if (parent == null) error (SWT.ERROR_WIDGET_DISPOSED);
	return parent.getDisplay ();
}

/**
 * Returns <code>true</code> if the receiver is enabled, and
 * <code>false</code> otherwise. A disabled control is typically
 * not selectable from the user interface and draws with an
 * inactive or "grayed" look.
 *
 * @return the receiver's enabled state
 *
 * @exception SWTException <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 boolean getEnabled () {
	checkWidget ();
	return OS.IsMenuCommandEnabled (parent.handle, id);
}

/**
 * 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 SWTException <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 & SWT.SEPARATOR) != 0) return "|";
	return super.getNameText ();
}

/**
 * Returns the receiver's parent, which must be a <code>Menu</code>.
 *
 * @return the receiver's parent
 *
 * @exception SWTException <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 SWTException <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 boolean getSelection () {
	checkWidget ();
	if ((style & (SWT.CHECK | SWT.RADIO)) == 0) return false;
	char [] outMark = new char [1];
	if (OS.GetMenuCommandMark (parent.handle, id, outMark) != OS.kNoErr) {
		error (SWT.ERROR_CANNOT_GET_SELECTION);
	}
	return outMark [0] != 0;
}

void handleMenuSelect () {
	if ((style & SWT.CHECK) != 0) {
		setSelection (!getSelection ());
	} else {
		if ((style & SWT.RADIO) != 0) {
			if ((parent.getStyle () & SWT.NO_RADIO_GROUP) != 0) {
				setSelection (!getSelection ());
			} else {
				selectRadio ();
			}
		}
	}
	Event event = new Event ();
	/* AW
	if (OS.GetKeyState (OS.VK_MENU) < 0) event.stateMask |= SWT.ALT;
	if (OS.GetKeyState (OS.VK_SHIFT) < 0) event.stateMask |= SWT.SHIFT;
	if (OS.GetKeyState (OS.VK_CONTROL) < 0) event.stateMask |= SWT.CONTROL;
	if (OS.GetKeyState (OS.VK_LBUTTON) < 0) event.stateMask |= SWT.BUTTON1;
	if (OS.GetKeyState (OS.VK_MBUTTON) < 0) event.stateMask |= SWT.BUTTON2;
	if (OS.GetKeyState (OS.VK_RBUTTON) < 0) event.stateMask |= SWT.BUTTON3;
	*/
	postEvent (SWT.Selection, event);
}

/**
 * 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 control is typically not selectable from the
 * user interface and draws with an inactive or "grayed" look.
 *
 * @return the receiver's enabled state
 *
 * @exception SWTException <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 boolean isEnabled () {
	return getEnabled () && parent.isEnabled ();
}

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

void releaseChild () {
	super.releaseChild ();
	if (menu != null) menu.dispose ();
	menu = null;
	parent.destroyItem (this);
}

void releaseWidget () {
	if (menu != null) {
		menu.releaseWidget ();
		menu.releaseHandle ();
	}
	menu = null;
	super.releaseWidget ();
	accelerator = 0;
	if (this == parent.defaultItem) {
		parent.defaultItem = null;
	}
	Decorations shell = parent.parent;
	shell.remove (this);
	parent = null;
	if (cIconHandle != 0) {
		Image.disposeCIcon (cIconHandle);
		cIconHandle = 0;
    }
}

/**
 * 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 be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception SWTException <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 == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.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 be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception SWTException <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 == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Help, listener);
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the control is selected.
 *
 * @param listener the listener which should be notified
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 * </ul>
 * @exception SWTException <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 == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Selection, listener);
	eventTable.unhook (SWT.DefaultSelection,listener);	
}

void selectRadio () {
	int index = 0;
	MenuItem [] items = parent.getItems ();
	while (index < items.length && items [index] != 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);
}

/**
 * Sets the widget accelerator.  An accelerator is the bit-wise
 * OR of zero or more modifier masks and a key. Examples:
 * <code>SWT.CONTROL | SWT.SHIFT | 'T', SWT.ALT | SWT.F2</code>.
 *
 * @param accelerator an integer that is the bit-wise OR of masks and a key
 *
 * </ul>
 * @exception SWTException <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 ();
	short [] outIndex = new short [1];
	if (OS.GetIndMenuItemWithCommandID (parent.handle, id, 1, null, outIndex) != OS.kNoErr) {
		return;
	}
	boolean update = (this.accelerator == 0 && accelerator != 0) || (this.accelerator != 0 && accelerator == 0);
	this.accelerator = accelerator;
	boolean inSetVirtualKey = false;
	int inModifiers = OS.kMenuNoModifiers, inGlyph = OS.kMenuNullGlyph, inKey = 0;
	if (accelerator != 0) {
		inKey = accelerator & ~(SWT.SHIFT | SWT.CONTROL | SWT.ALT | SWT.COMMAND);
		if (MacUtil.KEEP_MAC_SHORTCUTS) {
			if ((accelerator & SWT.COMMAND) != 0)
				if (inKey == 'H' || inKey == 'Q') return;
		}
		inGlyph = keyGlyph (inKey);
		int virtualKey = Display.untranslateKey (inKey);
		if (inKey == ' ') virtualKey = 49;
		if (virtualKey != 0) {
			inSetVirtualKey = true;
			inKey = virtualKey;
		} else {
			inKey = Character.toUpperCase ((char)inKey);
		}
		inModifiers = (byte) OS.kMenuNoCommandModifier;
		if ((accelerator & SWT.SHIFT) != 0) inModifiers |= OS.kMenuShiftModifier;
		if ((accelerator & SWT.CONTROL) != 0) inModifiers |= OS.kMenuControlModifier;
		if ((accelerator & SWT.COMMAND) != 0) inModifiers &= ~OS.kMenuNoCommandModifier;
		if ((accelerator & SWT.ALT) != 0) inModifiers |= OS.kMenuOptionModifier;
	}
	OS.SetMenuItemModifiers (parent.handle, outIndex [0], (byte)inModifiers);
	OS.SetMenuItemCommandKey (parent.handle, outIndex [0], inSetVirtualKey, (char)inKey);
	OS.SetMenuItemKeyGlyph (parent.handle, outIndex [0], (short)inGlyph);
	if (update) updateText ();
}

/**
 * Enables the receiver if the argument is <code>true</code>,
 * and disables it otherwise. A disabled control is typically
 * not selectable from the user interface and draws with an
 * inactive or "grayed" look.
 *
 * @param enabled the new enabled state
 *
 * @exception SWTException <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 (boolean enabled) {
	checkWidget ();
	short [] outIndex = new short [1];
	OS.GetIndMenuItemWithCommandID (parent.handle, id, 1, null, outIndex);
	int outMenuRef [] = new int [1];
	OS.GetMenuItemHierarchicalMenu (parent.handle, outIndex [0], outMenuRef);
	if (enabled) {
		if (outMenuRef [0] != 0) OS.EnableMenuItem (outMenuRef [0], (short) 0);
		OS.EnableMenuCommand (parent.handle, id);
	} else {
		if (outMenuRef [0] != 0) OS.DisableMenuItem (outMenuRef [0], (short) 0);
		OS.DisableMenuCommand (parent.handle, id);
	}
}

/**
 * Sets the image the receiver will display to the argument.
 * <p>
 * Note: This feature is not available on all window systems (for example, Window NT),
 * in which case, calling this method will silently do nothing.
 *
 * @param menu the image to display
 *
 * @exception SWTException <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 & SWT.SEPARATOR) != 0) return;
	super.setImage (image);
	if (cIconHandle != 0) Image.disposeCIcon (cIconHandle);
	cIconHandle = Image.carbon_createCIcon (image);
	if (cIconHandle != 0) {
		short [] outIndex = new short[1];
		if (OS.GetIndMenuItemWithCommandID (parent.handle, id, 1, null, outIndex) == OS.kNoErr) {
			OS.SetMenuItemIconHandle (parent.handle, outIndex [0], (byte)4, cIconHandle);
		}
	}
}

/**
 * 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.
 *
 * @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 SWTException <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 & SWT.CASCADE) == 0) {
		error (SWT.ERROR_MENUITEM_NOT_CASCADE);
	}
	if (menu != null) {
		if (menu.isDisposed()) error(SWT.ERROR_INVALID_ARGUMENT);
		if ((menu.style & SWT.DROP_DOWN) == 0) {
			error (SWT.ERROR_MENU_NOT_DROP_DOWN);
		}
		if (menu.parent != parent.parent) {
			error (SWT.ERROR_INVALID_PARENT);
		}
	}
	
	/* Assign the new menu */
	if (this.menu == menu) return;
	if (this.menu != null) this.menu.cascade = null;
	short [] outIndex = new short [1];
	if (OS.GetIndMenuItemWithCommandID (parent.handle, id, 1, null, outIndex) != OS.kNoErr) {
		error (SWT.ERROR_CANNOT_SET_MENU);
	}
	int inHierMenu = menu != null ? menu.handle : 0;
	if (OS.SetMenuItemHierarchicalMenu (parent.handle, outIndex [0], inHierMenu) != OS.kNoErr) {
		error (SWT.ERROR_CANNOT_SET_MENU);
	}
	if ((this.menu = menu) != null) {
		menu.cascade = this;
		int [] outString = new int [1];
		if (OS.CopyMenuItemTextAsCFString (parent.handle, outIndex [0], outString) != OS.kNoErr) {
			error (SWT.ERROR_CANNOT_SET_MENU);
		}
		OS.SetMenuTitleWithCFString (inHierMenu, outString [0]);
		OS.CFRelease (outString [0]);
	}
}

boolean setRadioSelection (boolean value) {
	if ((style & SWT.RADIO) == 0) return false;
	if (getSelection () != value) {
		setSelection (value);
		postEvent (SWT.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 SWTException <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 (boolean selected) {
	checkWidget ();
	if ((style & (SWT.CHECK | SWT.RADIO)) == 0) return;
	int inMark = selected ? ((style & SWT.RADIO) != 0) ? OS.diamondMark : OS.checkMark : 0;
	if (OS.SetMenuCommandMark (parent.handle, id, (char) inMark) != OS.kNoErr) {
		error (SWT.ERROR_CANNOT_SET_SELECTION);
	}
}

public void setText (String string) {
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	if ((style & SWT.SEPARATOR) != 0) return;
	super.setText (string);
	updateText ();
}

void updateText () {
	if ((style & SWT.SEPARATOR) != 0) return;
	short [] outIndex = new short [1];
	if (OS.GetIndMenuItemWithCommandID (parent.handle, id, 1, null, outIndex) != OS.kNoErr) {
		error (SWT.ERROR_CANNOT_SET_TEXT);
	}
	char [] buffer = new char [text.length ()];
	text.getChars (0, buffer.length, buffer, 0);
	int i=0, j=0;
	while (i < buffer.length) {
		if (accelerator != 0 && buffer [i] == '\t') break;
		if ((buffer [j++] = buffer [i++]) == Mnemonic) {
			if (i == buffer.length) {continue;}
			if (buffer [i] == Mnemonic) {i++; continue;}
			j--;
		}
	}
	//int str = OS.CFStringCreateWithCharacters (OS.kCFAllocatorDefault, buffer, j);
	int str = OS.CFStringCreateWithCharacters (new String(buffer, 0, j));
	if (str == 0) error (SWT.ERROR_CANNOT_SET_TEXT);
	OS.SetMenuItemTextWithCFString (parent.handle, outIndex [0], str);
	int [] outHierMenu = new int [1];
	OS.GetMenuItemHierarchicalMenu (parent.handle, outIndex [0], outHierMenu);
	if (outHierMenu [0] != 0) OS.SetMenuTitleWithCFString (outHierMenu [0], str);
	OS.CFRelease (str);
}
}