//------------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
private void OnStateChange(IntPtr hwnd, int idObject, int idChild)
{
NativeMethods.HWND nativeHwnd = NativeMethods.HWND.Cast(hwnd);
// Ignore windows that have been destroyed
if (!SafeNativeMethods.IsWindow(nativeHwnd))
{
return;
}
AutomationElement rawEl = AutomationElement.FromHandle(hwnd);
try
{
rawEl.GetCurrentPattern(WindowPattern.Pattern);
}
catch (InvalidOperationException)
{
// Only raise this event for elements with the WindowPattern.
return;
}
Object windowInteractionState = rawEl.GetPatternPropertyValue(WindowPattern.WindowInteractionStateProperty, false);
// if has no state value just return
if (!(windowInteractionState is WindowInteractionState))
{
return;
}
WindowInteractionState state = (WindowInteractionState)windowInteractionState;
// Filter... avoid duplicate events
if (hwnd == _lastHwnd && state == _lastState)
{
return;
}
AutomationPropertyChangedEventArgs e = new AutomationPropertyChangedEventArgs(
WindowPattern.WindowInteractionStateProperty,
hwnd == _lastHwnd ? _lastState : WindowInteractionState.Running,
state);
ClientEventManager.RaiseEventInThisClientOnly(AutomationElement.AutomationPropertyChangedEvent, rawEl, e);
// save the last hwnd/rect for filtering out duplicates
_lastHwnd = hwnd;
_lastState = state;
}
private void HandleBoundingRectChange(IntPtr hwnd)
{
NativeMethods.HWND nativeHwnd = NativeMethods.HWND.Cast(hwnd);
NativeMethods.RECT rc32 = new NativeMethods.RECT(0, 0, 0, 0);
// if GetWindwRect fails, most likely the nativeHwnd is an invalid window, so just return.
if (!Misc.GetWindowRect(nativeHwnd, out rc32))
{
return;
}
// Filter... avoid duplicate events
if (hwnd == _lastHwnd && Compare(rc32, _lastRect))
{
return;
}
AutomationElement rawEl = AutomationElement.FromHandle(hwnd);
// Problem with Avalon combo box & menus:
// There was a windows issue where we get two events. One for the hwnd (LocationChange WinEvent)
// and one for the [usually] DockPanel (Avalon BoundingRectangleProperty change). Both have the
// same Rect value. It's unclear is this issue is still occuring and what (if anything) needs to be done.
// Waiting for WPP redesign to investigate further how to filter out the duplicate which
// happens to be the first (hwnd-based) event.
//
AutomationPropertyChangedEventArgs e = new AutomationPropertyChangedEventArgs(
AutomationElement.BoundingRectangleProperty,
Rect.Empty,
new Rect(rc32.left, rc32.top, rc32.right - rc32.left, rc32.bottom - rc32.top));
// In the case of HWND hosted Avalon content, we will get a LocationChange WinEvent for the host
// window when it's bounding rect changes (e.g. an Avalon window is resized) and we won't (that I've seen)
// get a BoundingRect property change from the Avalon content. Therefore, we need to map the WinEvent.
// In this case, rawEl is already the remote object. It's ol to call this locally since this is called
// to handle a WinEvent (e.g. always called on client-side). Since rawEl may be local (proxied) or
// remote (native) impl then use that version of RaiseEventInThisClientOnly
ClientEventManager.RaiseEventInThisClientOnly(AutomationElement.AutomationPropertyChangedEvent, rawEl, e);
// save the last hwnd/rect for filtering out duplicates
_lastHwnd = hwnd;
_lastRect = rc32;
}
private void HandleBoundingRectChange(IntPtr hwnd)
{
NativeMethods.HWND nativeHwnd = NativeMethods.HWND.Cast(hwnd);
NativeMethods.RECT rc32 = new NativeMethods.RECT(0, 0, 0, 0);
// if GetWindwRect fails, most likely the nativeHwnd is an invalid window, so just return.
if (!Misc.GetWindowRect(nativeHwnd, out rc32))
{
return;
}
// Filter... avoid duplicate events
if (hwnd == _lastHwnd && Compare(rc32, _lastRect))
{
return;
}
AutomationElement rawEl = AutomationElement.FromHandle(hwnd);
//
//
AutomationPropertyChangedEventArgs e = new AutomationPropertyChangedEventArgs(
AutomationElement.BoundingRectangleProperty,
Rect.Empty,
new Rect(rc32.left, rc32.top, rc32.right - rc32.left, rc32.bottom - rc32.top));
//
ClientEventManager.RaiseEventInThisClientOnly(AutomationElement.AutomationPropertyChangedEvent, rawEl, e);
// save the last hwnd/rect for filtering out duplicates
_lastHwnd = hwnd;
_lastRect = rc32;
}
//------------------------------------------------------
//
// 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;
}
