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/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / UIAutomation / UIAutomationClient / MS / Internal / Automation / FocusTracker.cs / 1305600 / FocusTracker.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: Class that tracks Win32 focus changes // // History: // 06/17/2003 : BrendanM Ported to WCP // //--------------------------------------------------------------------------- using System; using System.Windows.Automation; using System.Windows.Automation.Provider; using System.Diagnostics; using MS.Win32; namespace MS.Internal.Automation { // Class that tracks Win32 focus changes internal class FocusTracker : WinEventWrap { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // Ctor - provide the WinEvent identifiers used to track focus changes internal FocusTracker() : base(_eventIds) { // Intentionally not setting the callback for the base WinEventWrap since the WinEventProc override // in this class calls RaiseEventInThisClientOnly to actually raise the event to the client. } #endregion Constructors //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- #region Internal Methods // WinEventProc - override to process WinEvents internal override void WinEventProc(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { if (hwnd != IntPtr.Zero) { switch(eventId) { case NativeMethods.EVENT_OBJECT_FOCUS: OnEventObjectFocus(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_SYSTEM_MENUSTART: OnEventSystemMenuStart(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_SYSTEM_MENUEND: OnEventSystemMenuEnd(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_SYSTEM_SWITCHSTART: OnEventSystemMenuStart(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_SYSTEM_SWITCHEND: OnEventSystemMenuEnd(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_OBJECT_DESTROY: OnEventObjectDestroy(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_SYSTEM_MENUPOPUPSTART: OnEventSystemMenuPopupStart(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_SYSTEM_CAPTURESTART: OnEventSystemCaptureStart(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_SYSTEM_CAPTUREEND: OnEventSystemCaptureEnd(eventId, hwnd, idObject, idChild, eventTime); break; } } } #endregion Internal Methods //------------------------------------------------------ // // Private Methods // //------------------------------------------------------ #region Private Methods // HandleFocusChange - Called when a WinEvent we're listening to indicates the // focus has changed. This is where the callback to the client is queued. private void HandleFocusChange(IntPtr hwnd, Accessible acc, int idObject, int idChild, uint eventTime) { // If there is an hwnd then notify of a focus change if (hwnd != IntPtr.Zero) { Debug.Assert(acc != null, "HandleFocusChange got hwnd and null IAccessible"); // Create an event args and get the source logical element AutomationFocusChangedEventArgs e = new InternalAutomationFocusChangedEventArgs(idObject, idChild, eventTime); AutomationElement srcEl = GetFocusedElementFromWinEvent(hwnd, idObject, idChild); if (srcEl == null) { // Don't raise focus change events for UI that is gone. This has been seen when toolbar menus are // being manipulated (e.g. mnu.SubMenu("File").MenuItems("Close").Click() in MITA). We should be // seeing another focus change soon and with that event we can re-establish focus. return; } // Check that item is actually focused // Don't do this for statics - the controls in the color picker are statics, and // they get focus, but OLEACC assumes statics don't get focus, so never sets the // focus bit. So, for now, assume statics that send focus do actually have focus. if (!Accessible.IsStatic(hwnd) && !Accessible.IsComboDropdown(hwnd)) { // instead of depending on oleacc to see if something has focus ask provider if (!(bool)srcEl.GetCurrentPropertyValue(AutomationElement.HasKeyboardFocusProperty)) { return; } } // Do notifies ClientEventManager.RaiseEventInThisClientOnly(AutomationElement.AutomationFocusChangedEvent, srcEl, e); } // Keep track of where we are right now (may be unknown/null) _accCurrent = acc; } // We need to treat MSAA's FOCUS winevents differently depending on the OBJID - // OBJID_CLIENT gets routed to the proxies; _MENU and _SYSMENU get speical treatment. private AutomationElement GetFocusedElementFromWinEvent(IntPtr hwnd, int idObject, int idChild) { try { IRawElementProviderSimple provider = null; // These are the only object types that oleacc proxies allow to take focus. // (Native IAccessibles can send focus for other custom OBJID valus, but those are no use // to us.) // Try and get providers for them ourself - if we don't get anything, then // defer to core to get the element for the HWND itself. if (idObject == UnsafeNativeMethods.OBJID_CLIENT) { // regular focus - pass it off to a proxy... provider = ProxyManager.ProxyProviderFromHwnd(NativeMethods.HWND.Cast(hwnd), idChild, UnsafeNativeMethods.OBJID_CLIENT); } else if (idObject == UnsafeNativeMethods.OBJID_MENU) { // menubar focus - see if there's a menubar pseudo-proxy registered... ClientSideProviderFactoryCallback factory = ProxyManager.NonClientMenuBarProxyFactory; if (factory != null) { provider = factory(hwnd, idChild, idObject); } } else if (idObject == UnsafeNativeMethods.OBJID_SYSMENU) { // system menu box focus - see if there's a sysmenu pseudo-proxy registered... ClientSideProviderFactoryCallback factory = ProxyManager.NonClientSysMenuProxyFactory; if (factory != null) { provider = factory(hwnd, idChild, idObject); } } else if (idObject <= 0) { return null; } else { // This covers OBJID_CLIENT and custom OBJID cases. // Pass it to the proxy manager: most proxies will just handle OBJID_CLIENT, // but the MSAA proxy can potentally handle other OBJID values. provider = ProxyManager.ProxyProviderFromHwnd(NativeMethods.HWND.Cast(hwnd), idChild, idObject); } if(provider != null) { // Ask the fragment root if any of its children really have the focus IRawElementProviderFragmentRoot fragment = provider as IRawElementProviderFragmentRoot; if (fragment != null) { // if we get back something that is different than what we started with and its not null // use that instead. This is here to get the subset link in the listview but could be usefull // for listview subitems as well. IRawElementProviderSimple realFocus = fragment.GetFocus(); if(realFocus != null && !Object.ReferenceEquals(realFocus, provider)) { provider = realFocus; } } SafeNodeHandle hnode = UiaCoreApi.UiaNodeFromProvider(provider); return AutomationElement.Wrap(hnode); } else { // Didn't find a proxy to handle this hwnd - pass off to core... return AutomationElement.FromHandle(hwnd); } } catch( Exception e ) { if( Misc.IsCriticalException( e ) ) throw; return null; } } // OnEventObjectFocus - process an EventObjectFocus WinEvent. private void OnEventObjectFocus(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { Accessible acc = Accessible.Create(hwnd, idObject, idChild); if (acc == null) { return; } // Keep track of last focused non-menu item, so we can restore focus when we leave menu mode if (!_fInMenu) { _accLastBeforeMenu = acc; _hwndLastBeforeMenu = hwnd; _idLastObject = idObject; _idLastChild = idChild; } HandleFocusChange(hwnd, acc, idObject, idChild, eventTime); } // OnEventSystemMenuStart - process an EventSystemMenuStart WinEvent. private void OnEventSystemMenuStart(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { // No immediate effect on focus - we expect to get a FOCUS event after this. _fInMenu = true; } // OnEventSystemMenuEnd - process an EventSystemMenuEnd WinEvent. private void OnEventSystemMenuEnd(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { // Restore focus to where it was before the menu appeared if (_fInMenu) { _fInMenu = false; if (_accLastBeforeMenu != null) { HandleFocusChange(_hwndLastBeforeMenu, _accLastBeforeMenu, _idLastObject, _idLastChild, eventTime); } } } // OnEventObjectDestroy - process an EventObjectDestroy WinEvent. private void OnEventObjectDestroy(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { // Check if still alive. Ignore caret destroys - we're only interesed in 'real' objects here... if (idObject != UnsafeNativeMethods.OBJID_CARET && _accCurrent != null) { bool fDead = false; try { int dwState = _accCurrent.State; IntPtr hwndCur = _accCurrent.Window; if (hwndCur == IntPtr.Zero || !SafeNativeMethods.IsWindow(NativeMethods.HWND.Cast(hwndCur))) { fDead = true; } } catch( Exception e ) { if( Misc.IsCriticalException( e ) ) throw; fDead = true; } if (fDead) { // It's dead... HandleFocusChange(IntPtr.Zero, null, 0, 0, eventTime); } } } // OnEventSystemMenuPopupStart - process an EventSystemMenuPopupStart WinEvent. private void OnEventSystemMenuPopupStart(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { Accessible acc = Accessible.Create(hwnd, idObject, idChild); if( acc == null ) return; HandleFocusChange(hwnd, acc, idObject, idChild, eventTime); } // OnEventSystemCaptureStart - process an EventSystemCaptureStart WinEvent. private void OnEventSystemCaptureStart(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { // Deal only with Combolbox dropdowns... if (Accessible.IsComboDropdown(hwnd)) { // Need to get id of focused item... try { IntPtr i = Misc.SendMessageTimeout(NativeMethods.HWND.Cast(hwnd), UnsafeNativeMethods.LB_GETCURSEL, IntPtr.Zero, IntPtr.Zero); Accessible acc = Accessible.Create(hwnd, UnsafeNativeMethods.OBJID_CLIENT, i.ToInt32() + 1); if (acc == null) return; HandleFocusChange(hwnd, acc, idObject, idChild, eventTime); } catch (TimeoutException) { // Ignore } } } // OnEventSystemCaptureEnd - process an EventSystemCaptureEnd WinEvent. private void OnEventSystemCaptureEnd(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { // Deal only with Combolbox dropdowns... if (Accessible.IsComboDropdown(hwnd)) { SafeNativeMethods.GUITHREADINFO guiThreadInfo = new SafeNativeMethods.GUITHREADINFO(); if (!Misc.GetGUIThreadInfo(0, ref guiThreadInfo)) { return; } Accessible acc = Accessible.Create(guiThreadInfo.hwndFocus, UnsafeNativeMethods.OBJID_CLIENT, 0); if (acc == null) return; HandleFocusChange(hwnd, acc, idObject, idChild, eventTime); } } #endregion Private Methods //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ #region Private Fields private static int [] _eventIds = new int [] { NativeMethods.EVENT_OBJECT_FOCUS, NativeMethods.EVENT_SYSTEM_MENUSTART, NativeMethods.EVENT_SYSTEM_MENUPOPUPSTART, NativeMethods.EVENT_SYSTEM_MENUEND, NativeMethods.EVENT_OBJECT_DESTROY, NativeMethods.EVENT_SYSTEM_CAPTURESTART, NativeMethods.EVENT_SYSTEM_CAPTUREEND, NativeMethods.EVENT_SYSTEM_SWITCHSTART, NativeMethods.EVENT_SYSTEM_SWITCHEND }; private Accessible _accCurrent; // the IAccessible currently being handled private Accessible _accLastBeforeMenu; // the last IAccessible before a menu got focus private IntPtr _hwndLastBeforeMenu; // the last hwnd before a menu got focus private int _idLastObject; // the last idObject before a menu got focus private int _idLastChild; // the last idChild before a menu got focus private bool _fInMenu; // true if there's a menu up #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: Class that tracks Win32 focus changes // // History: // 06/17/2003 : BrendanM Ported to WCP // //--------------------------------------------------------------------------- using System; using System.Windows.Automation; using System.Windows.Automation.Provider; using System.Diagnostics; using MS.Win32; namespace MS.Internal.Automation { // Class that tracks Win32 focus changes internal class FocusTracker : WinEventWrap { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // Ctor - provide the WinEvent identifiers used to track focus changes internal FocusTracker() : base(_eventIds) { // Intentionally not setting the callback for the base WinEventWrap since the WinEventProc override // in this class calls RaiseEventInThisClientOnly to actually raise the event to the client. } #endregion Constructors //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- #region Internal Methods // WinEventProc - override to process WinEvents internal override void WinEventProc(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { if (hwnd != IntPtr.Zero) { switch(eventId) { case NativeMethods.EVENT_OBJECT_FOCUS: OnEventObjectFocus(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_SYSTEM_MENUSTART: OnEventSystemMenuStart(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_SYSTEM_MENUEND: OnEventSystemMenuEnd(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_SYSTEM_SWITCHSTART: OnEventSystemMenuStart(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_SYSTEM_SWITCHEND: OnEventSystemMenuEnd(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_OBJECT_DESTROY: OnEventObjectDestroy(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_SYSTEM_MENUPOPUPSTART: OnEventSystemMenuPopupStart(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_SYSTEM_CAPTURESTART: OnEventSystemCaptureStart(eventId, hwnd, idObject, idChild, eventTime); break; case NativeMethods.EVENT_SYSTEM_CAPTUREEND: OnEventSystemCaptureEnd(eventId, hwnd, idObject, idChild, eventTime); break; } } } #endregion Internal Methods //------------------------------------------------------ // // Private Methods // //------------------------------------------------------ #region Private Methods // HandleFocusChange - Called when a WinEvent we're listening to indicates the // focus has changed. This is where the callback to the client is queued. private void HandleFocusChange(IntPtr hwnd, Accessible acc, int idObject, int idChild, uint eventTime) { // If there is an hwnd then notify of a focus change if (hwnd != IntPtr.Zero) { Debug.Assert(acc != null, "HandleFocusChange got hwnd and null IAccessible"); // Create an event args and get the source logical element AutomationFocusChangedEventArgs e = new InternalAutomationFocusChangedEventArgs(idObject, idChild, eventTime); AutomationElement srcEl = GetFocusedElementFromWinEvent(hwnd, idObject, idChild); if (srcEl == null) { // Don't raise focus change events for UI that is gone. This has been seen when toolbar menus are // being manipulated (e.g. mnu.SubMenu("File").MenuItems("Close").Click() in MITA). We should be // seeing another focus change soon and with that event we can re-establish focus. return; } // Check that item is actually focused // Don't do this for statics - the controls in the color picker are statics, and // they get focus, but OLEACC assumes statics don't get focus, so never sets the // focus bit. So, for now, assume statics that send focus do actually have focus. if (!Accessible.IsStatic(hwnd) && !Accessible.IsComboDropdown(hwnd)) { // instead of depending on oleacc to see if something has focus ask provider if (!(bool)srcEl.GetCurrentPropertyValue(AutomationElement.HasKeyboardFocusProperty)) { return; } } // Do notifies ClientEventManager.RaiseEventInThisClientOnly(AutomationElement.AutomationFocusChangedEvent, srcEl, e); } // Keep track of where we are right now (may be unknown/null) _accCurrent = acc; } // We need to treat MSAA's FOCUS winevents differently depending on the OBJID - // OBJID_CLIENT gets routed to the proxies; _MENU and _SYSMENU get speical treatment. private AutomationElement GetFocusedElementFromWinEvent(IntPtr hwnd, int idObject, int idChild) { try { IRawElementProviderSimple provider = null; // These are the only object types that oleacc proxies allow to take focus. // (Native IAccessibles can send focus for other custom OBJID valus, but those are no use // to us.) // Try and get providers for them ourself - if we don't get anything, then // defer to core to get the element for the HWND itself. if (idObject == UnsafeNativeMethods.OBJID_CLIENT) { // regular focus - pass it off to a proxy... provider = ProxyManager.ProxyProviderFromHwnd(NativeMethods.HWND.Cast(hwnd), idChild, UnsafeNativeMethods.OBJID_CLIENT); } else if (idObject == UnsafeNativeMethods.OBJID_MENU) { // menubar focus - see if there's a menubar pseudo-proxy registered... ClientSideProviderFactoryCallback factory = ProxyManager.NonClientMenuBarProxyFactory; if (factory != null) { provider = factory(hwnd, idChild, idObject); } } else if (idObject == UnsafeNativeMethods.OBJID_SYSMENU) { // system menu box focus - see if there's a sysmenu pseudo-proxy registered... ClientSideProviderFactoryCallback factory = ProxyManager.NonClientSysMenuProxyFactory; if (factory != null) { provider = factory(hwnd, idChild, idObject); } } else if (idObject <= 0) { return null; } else { // This covers OBJID_CLIENT and custom OBJID cases. // Pass it to the proxy manager: most proxies will just handle OBJID_CLIENT, // but the MSAA proxy can potentally handle other OBJID values. provider = ProxyManager.ProxyProviderFromHwnd(NativeMethods.HWND.Cast(hwnd), idChild, idObject); } if(provider != null) { // Ask the fragment root if any of its children really have the focus IRawElementProviderFragmentRoot fragment = provider as IRawElementProviderFragmentRoot; if (fragment != null) { // if we get back something that is different than what we started with and its not null // use that instead. This is here to get the subset link in the listview but could be usefull // for listview subitems as well. IRawElementProviderSimple realFocus = fragment.GetFocus(); if(realFocus != null && !Object.ReferenceEquals(realFocus, provider)) { provider = realFocus; } } SafeNodeHandle hnode = UiaCoreApi.UiaNodeFromProvider(provider); return AutomationElement.Wrap(hnode); } else { // Didn't find a proxy to handle this hwnd - pass off to core... return AutomationElement.FromHandle(hwnd); } } catch( Exception e ) { if( Misc.IsCriticalException( e ) ) throw; return null; } } // OnEventObjectFocus - process an EventObjectFocus WinEvent. private void OnEventObjectFocus(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { Accessible acc = Accessible.Create(hwnd, idObject, idChild); if (acc == null) { return; } // Keep track of last focused non-menu item, so we can restore focus when we leave menu mode if (!_fInMenu) { _accLastBeforeMenu = acc; _hwndLastBeforeMenu = hwnd; _idLastObject = idObject; _idLastChild = idChild; } HandleFocusChange(hwnd, acc, idObject, idChild, eventTime); } // OnEventSystemMenuStart - process an EventSystemMenuStart WinEvent. private void OnEventSystemMenuStart(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { // No immediate effect on focus - we expect to get a FOCUS event after this. _fInMenu = true; } // OnEventSystemMenuEnd - process an EventSystemMenuEnd WinEvent. private void OnEventSystemMenuEnd(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { // Restore focus to where it was before the menu appeared if (_fInMenu) { _fInMenu = false; if (_accLastBeforeMenu != null) { HandleFocusChange(_hwndLastBeforeMenu, _accLastBeforeMenu, _idLastObject, _idLastChild, eventTime); } } } // OnEventObjectDestroy - process an EventObjectDestroy WinEvent. private void OnEventObjectDestroy(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { // Check if still alive. Ignore caret destroys - we're only interesed in 'real' objects here... if (idObject != UnsafeNativeMethods.OBJID_CARET && _accCurrent != null) { bool fDead = false; try { int dwState = _accCurrent.State; IntPtr hwndCur = _accCurrent.Window; if (hwndCur == IntPtr.Zero || !SafeNativeMethods.IsWindow(NativeMethods.HWND.Cast(hwndCur))) { fDead = true; } } catch( Exception e ) { if( Misc.IsCriticalException( e ) ) throw; fDead = true; } if (fDead) { // It's dead... HandleFocusChange(IntPtr.Zero, null, 0, 0, eventTime); } } } // OnEventSystemMenuPopupStart - process an EventSystemMenuPopupStart WinEvent. private void OnEventSystemMenuPopupStart(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { Accessible acc = Accessible.Create(hwnd, idObject, idChild); if( acc == null ) return; HandleFocusChange(hwnd, acc, idObject, idChild, eventTime); } // OnEventSystemCaptureStart - process an EventSystemCaptureStart WinEvent. private void OnEventSystemCaptureStart(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { // Deal only with Combolbox dropdowns... if (Accessible.IsComboDropdown(hwnd)) { // Need to get id of focused item... try { IntPtr i = Misc.SendMessageTimeout(NativeMethods.HWND.Cast(hwnd), UnsafeNativeMethods.LB_GETCURSEL, IntPtr.Zero, IntPtr.Zero); Accessible acc = Accessible.Create(hwnd, UnsafeNativeMethods.OBJID_CLIENT, i.ToInt32() + 1); if (acc == null) return; HandleFocusChange(hwnd, acc, idObject, idChild, eventTime); } catch (TimeoutException) { // Ignore } } } // OnEventSystemCaptureEnd - process an EventSystemCaptureEnd WinEvent. private void OnEventSystemCaptureEnd(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime) { // Deal only with Combolbox dropdowns... if (Accessible.IsComboDropdown(hwnd)) { SafeNativeMethods.GUITHREADINFO guiThreadInfo = new SafeNativeMethods.GUITHREADINFO(); if (!Misc.GetGUIThreadInfo(0, ref guiThreadInfo)) { return; } Accessible acc = Accessible.Create(guiThreadInfo.hwndFocus, UnsafeNativeMethods.OBJID_CLIENT, 0); if (acc == null) return; HandleFocusChange(hwnd, acc, idObject, idChild, eventTime); } } #endregion Private Methods //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ #region Private Fields private static int [] _eventIds = new int [] { NativeMethods.EVENT_OBJECT_FOCUS, NativeMethods.EVENT_SYSTEM_MENUSTART, NativeMethods.EVENT_SYSTEM_MENUPOPUPSTART, NativeMethods.EVENT_SYSTEM_MENUEND, NativeMethods.EVENT_OBJECT_DESTROY, NativeMethods.EVENT_SYSTEM_CAPTURESTART, NativeMethods.EVENT_SYSTEM_CAPTUREEND, NativeMethods.EVENT_SYSTEM_SWITCHSTART, NativeMethods.EVENT_SYSTEM_SWITCHEND }; private Accessible _accCurrent; // the IAccessible currently being handled private Accessible _accLastBeforeMenu; // the last IAccessible before a menu got focus private IntPtr _hwndLastBeforeMenu; // the last hwnd before a menu got focus private int _idLastObject; // the last idObject before a menu got focus private int _idLastChild; // the last idChild before a menu got focus private bool _fInMenu; // true if there's a menu up #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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