menu.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

				info.fMask = OS.MIIM_DATA;
				info.dwItemData = item.id;
				success = OS.SetMenuItemInfo (handle, index, true, info);
			}
		} else {
			/*
			* Bug in Windows.  For some reason, when InsertMenuItem()
			* is used to insert an item without text, it is not possible
			* to use SetMenuItemInfo() to set the text at a later time.
			* The fix is to insert the item with some text.
			* 
			* Feature in Windows.  When an empty string is used instead
			* of a space and InsertMenuItem() is used to set a submenu
			* before setting text to a non-empty string, the menu item
			* becomes unexpectedly disabled.  The fix is to insert a
			* space.
			*/
			int hHeap = OS.GetProcessHeap ();
			TCHAR buffer = new TCHAR (0, " ", true);
			int byteCount = buffer.length () * TCHAR.sizeof;
			int pszText = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, byteCount);
			OS.MoveMemory (pszText, buffer, byteCount);	
			MENUITEMINFO info = new MENUITEMINFO ();
			info.cbSize = MENUITEMINFO.sizeof;
			info.fMask = OS.MIIM_ID | OS.MIIM_TYPE | OS.MIIM_DATA;
			info.wID = info.dwItemData = item.id;
			info.fType = item.widgetStyle ();
			info.dwTypeData = pszText;
			success = OS.InsertMenuItem (handle, index, true, info);
			if (pszText != 0) OS.HeapFree (hHeap, 0, pszText);
		}
	}
	if (!success) {
		display.removeMenuItem (item);
		error (SWT.ERROR_ITEM_NOT_ADDED);
	}
	redraw ();
}
	
void createWidget () {
	/*
	* Bug in IBM JVM 1.3.1.  For some reason, when the following code is called
	* from this method, the JVM issues this error:
	*
	* JVM Exception 0x2 (subcode 0x0) occurred in thread "main" (TID:0x9F19D8)
	* 
	* In addition, on Windows XP, a dialog appears with following error message,
	* indicating that the problem may be in the JIT:
	* 
	* AppName: java.exe	 AppVer: 0.0.0.0	 ModName: jitc.dll
	* ModVer: 0.0.0.0	 Offset: 000b6912
	* 
	* The fix is to move the code to the caller of this method.
	*/
//	checkOrientation (parent);
	createHandle ();
	parent.addMenu (this);
}

/*
* Currently not used.
*/
int defaultBackground () {
	return OS.GetSysColor (OS.COLOR_MENU);
}

/*
* Currently not used.
*/
int defaultForeground () {
	return OS.GetSysColor (OS.COLOR_MENUTEXT);
}

void destroyAccelerators () {
	parent.destroyAccelerators ();
}

void destroyItem (MenuItem item) {
	if (OS.IsWinCE) {
		if ((OS.IsPPC || OS.IsSP) && hwndCB != 0) {
			if (OS.IsSP) {
				redraw();
				return;
			}
			int index = OS.SendMessage (hwndCB, OS.TB_COMMANDTOINDEX, item.id, 0);
			if (OS.SendMessage (hwndCB, OS.TB_DELETEBUTTON, index, 0) == 0) {
				error (SWT.ERROR_ITEM_NOT_REMOVED);
			}
			int count = OS.SendMessage (hwndCB, OS.TB_BUTTONCOUNT, 0, 0);
			if (count == 0) {
				if (imageList != null) {
					OS.SendMessage (handle, OS.TB_SETIMAGELIST, 0, 0);
					display.releaseImageList (imageList);
					imageList = null;
				}
			}
		} else {
			int index = 0;
			MENUITEMINFO info = new MENUITEMINFO ();
			info.cbSize = MENUITEMINFO.sizeof;
			info.fMask = OS.MIIM_DATA;
			while (OS.GetMenuItemInfo (handle, index, true, info)) {
				if (info.dwItemData == item.id) break;
				index++;
			}
			if (info.dwItemData != item.id) {
				error (SWT.ERROR_ITEM_NOT_REMOVED);
			}	
			if (!OS.RemoveMenu (handle, index, OS.MF_BYPOSITION)) {
				error (SWT.ERROR_ITEM_NOT_REMOVED);
			}
		}
	} else {
		if (!OS.RemoveMenu (handle, item.id, OS.MF_BYCOMMAND)) {
			error (SWT.ERROR_ITEM_NOT_REMOVED);
		}
	}
	redraw ();
}

void destroyWidget () {
	int hMenu = handle, hCB = hwndCB;
	releaseHandle ();
	if (OS.IsWinCE && hCB != 0) {
		OS.CommandBar_Destroy (hCB);
	} else {
		if (hMenu != 0) OS.DestroyMenu (hMenu);
	}
}

void fixMenus (Decorations newParent) {
	MenuItem [] items = getItems ();
	for (int i=0; i<items.length; i++) {
		items [i].fixMenus (newParent);
	}
	parent.removeMenu (this);
	newParent.addMenu (this);
	this.parent = newParent;
}

/**
 * Returns the default menu item or null if none has
 * been previously set.
 *
 * @return the default menu item.
 *
 * </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 MenuItem getDefaultItem () {
	checkWidget ();
	if (OS.IsWinCE) return null;
	int id = OS.GetMenuDefaultItem (handle, OS.MF_BYCOMMAND, OS.GMDI_USEDISABLED);
	if (id == -1) return null;
	MENUITEMINFO info = new MENUITEMINFO ();
	info.cbSize = MENUITEMINFO.sizeof;
	info.fMask = OS.MIIM_ID;
	if (OS.GetMenuItemInfo (handle, id, false, info)) {
		return display.getMenuItem (info.wID);
	}
	return null;
}

/**
 * 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>
 * 
 * @see #isEnabled
 */
public boolean getEnabled () {
	checkWidget ();
	return (state & DISABLED) == 0;
}

/**
 * Returns the item at the given, zero-relative index in the
 * receiver. Throws an exception if the index is out of range.
 *
 * @param index the index of the item to return
 * @return the item at the given index
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</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 MenuItem getItem (int index) {
	checkWidget ();
	int id = 0;
	if ((OS.IsPPC || OS.IsSP) && hwndCB != 0) {
		if (OS.IsPPC) {
			TBBUTTON lpButton = new TBBUTTON ();
			int result = OS.SendMessage (hwndCB, OS.TB_GETBUTTON, index, lpButton);
			if (result == 0) error (SWT.ERROR_CANNOT_GET_ITEM);
			id = lpButton.idCommand;
		}
		if (OS.IsSP) {
			if (!(0 <= index && index <= 1)) error (SWT.ERROR_CANNOT_GET_ITEM);
			id = index == 0 ? id0 : id1;
		}
	} else {
		MENUITEMINFO info = new MENUITEMINFO ();
		info.cbSize = MENUITEMINFO.sizeof;
		info.fMask = OS.MIIM_DATA;
		if (!OS.GetMenuItemInfo (handle, index, true, info)) {
			error (SWT.ERROR_INVALID_RANGE);
		}
		id = info.dwItemData;
	}
	return display.getMenuItem (id);
}

/**
 * Returns the number of items contained in the receiver.
 *
 * @return the number of items
 *
 * @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 getItemCount () {
	checkWidget ();
	return GetMenuItemCount (handle);
}

/**
 * Returns an array of <code>MenuItem</code>s which are the items
 * in the receiver. 
 * <p>
 * Note: This is not the actual structure used by the receiver
 * to maintain its list of items, so modifying the array will
 * not affect the receiver. 
 * </p>
 *
 * @return the items in the receiver
 *
 * @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 MenuItem [] getItems () {
	checkWidget ();
	if ((OS.IsPPC || OS.IsSP) && hwndCB != 0) {
		if (OS.IsSP) {
			MenuItem [] result = new MenuItem [2];
			result[0] = display.getMenuItem (id0);
			result[1] = display.getMenuItem (id1);
			return result;
		}
		int count = OS.SendMessage (hwndCB, OS.TB_BUTTONCOUNT, 0, 0);
		TBBUTTON lpButton = new TBBUTTON ();
		MenuItem [] result = new MenuItem [count];
		for (int i=0; i<count; i++) {
			OS.SendMessage (hwndCB, OS.TB_GETBUTTON, i, lpButton);
			result [i] = display.getMenuItem (lpButton.idCommand);
		}
		return result;
	}
	int index = 0;
	int length = OS.IsWinCE ? 4 : OS.GetMenuItemCount (handle);
	MenuItem [] items = new MenuItem [length];
	MENUITEMINFO info = new MENUITEMINFO ();
	info.cbSize = MENUITEMINFO.sizeof;
	info.fMask = OS.MIIM_DATA;
	while (OS.GetMenuItemInfo (handle, index, true, info)) {
		if (index == items.length) {
			MenuItem [] newItems = new MenuItem [index + 4];
			System.arraycopy (items, 0, newItems, 0, index);
			items = newItems;
		}
		items [index++] = display.getMenuItem (info.dwItemData);
	}
	if (index == items.length) return items;
	MenuItem [] result = new MenuItem [index];
	System.arraycopy (items, 0, result, 0, index);
	return result;
}

int GetMenuItemCount (int handle) {
	checkWidget ();
	if (OS.IsWinCE) {
		if ((OS.IsPPC || OS.IsSP) && hwndCB != 0) {
			return OS.IsSP ? 2 : OS.SendMessage (hwndCB, OS.TB_BUTTONCOUNT, 0, 0);
		}
		int count = 0;
		MENUITEMINFO info = new MENUITEMINFO ();
		info.cbSize = MENUITEMINFO.sizeof;
		while (OS.GetMenuItemInfo (handle, count, true, info)) count++;
		return count;
	}
	return OS.GetMenuItemCount (handle);
}

String getNameText () {
	String result = "";
	MenuItem [] items = getItems ();
	int length = items.length;
	if (length > 0) {
		for (int i=0; i<length-1; i++) {
			result = result + items [i].getNameText() + ", ";
		}
		result = result + items [length-1].getNameText ();
	}
	return result;
}

/**
 * Returns the receiver's parent, which must be a <code>Decorations</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 Decorations getParent () {
	checkWidget ();
	return parent;
}

/**
 * Returns the receiver's parent item, which must be a
 * <code>MenuItem</code> or null when the receiver is a
 * root.
 *
 * @return the receiver's parent item
 *
 * @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 MenuItem getParentItem () {
	checkWidget ();
	return cascade;
}

/**
 * Returns the receiver's parent item, which must be a
 * <code>Menu</code> or null when the receiver is a
 * root.
 *
 * @return the receiver's parent item
 *
 * @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 getParentMenu () {
	checkWidget ();
	if (cascade != null) return cascade.parent;
	return null;
}

/**
 * Returns the receiver's shell. For all controls other than
 * shells, this simply returns the control's nearest ancestor
 * shell. Shells return themselves, even if they are children
 * of other shells.
 *
 * @return the receiver's shell
 *
 * @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 #getParent
 */
public Shell getShell () {
	checkWidget ();
	return parent.getShell ();
}

/**
 * Returns a point describing the receiver's size. The
 * x coordinate of the result is the width of the receiver.
 * The y coordinate of the result is the height of the
 * receiver.
 *
 * @return the receiver's size
 *
 * @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>
 * 
 * @since 3.0
 */
/*public*/ Point getSize () {
	checkWidget ();
	if (OS.IsWinCE) return new Point (0, 0);
	if ((style & SWT.BAR) != 0) {
		MENUBARINFO info = new MENUBARINFO ();
		info.cbSize = MENUBARINFO.sizeof;
		int hwndParent = parent.handle;
		if (OS.GetMenuBarInfo (hwndParent, OS.OBJID_MENU, 0, info)) {
			int width = info.right - info.left;
			int height = info.bottom - info.top;
			return new Point (width, height);
		}
	} else {
		int count = GetMenuItemCount (handle);
		if (count != 0) {
			RECT rect1 = new RECT ();
			int hwndParent = parent.handle;
			if (OS.GetMenuItemRect (hwndParent, handle, 0, rect1)) {
				RECT rect2 = new RECT ();
				if (OS.GetMenuItemRect (hwndParent, handle, count - 1, rect2)) {
					int width = (rect2.right - rect2.left) + 4;
					int height = (rect2.bottom - rect1.top) + 4;
					return new Point (width, height);
				}
			}
		}
	}
	return new Point (0, 0);
}

/**
 * Returns <code>true</code> if the receiver is visible, and
 * <code>false</code> otherwise.
 * <p>