// 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); }
// 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); }
// 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); } }
//------------------------------------------------------ // // 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; }
//------------------------------------------------------ // // 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; }
// 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 } } }