private async void OnFocusChanged(object sender, AutomationFocusChangedEventArgs e)
{
_focusSource?.Cancel();
var source = new CancellationTokenSource();
_focusSource = source;
await Task.Run(async() =>
{
try
{
if (source.IsCancellationRequested)
{
return;
}
Debug.WriteLine("focus changed");
var focusedElement = sender as AutomationElement;
if (focusedElement == null)
{
return;
}
var window = GetTopLevelWindow(focusedElement, source);
if (source.IsCancellationRequested)
{
return;
}
if (window == null)
{
Debug.WriteLine("Null window");
return;
}
if (_focusedWindow == window)
{
Debug.WriteLine("Same window");
//return;
}
try
{
if (_focusedWindow != null)
{
Automation.RemoveStructureChangedEventHandler(_focusedWindow, OnStructureChanged);
}
}
catch (ArgumentException ex)
{
}
_focusedWindow = window;
FocusedWindowChanged?.Invoke(this, _focusedWindow);
await Update();
Automation.AddStructureChangedEventHandler(_focusedWindow, TreeScope.Subtree, OnStructureChanged);
}
catch (COMException)
{
}
});
}
private void SetFocusedWindow(IntPtr newWindow)
{
IntPtr oldWindow = focusedWindow;
focusedWindow = newWindow;
if (newWindow != oldWindow)
{
FocusedWindowChanged?.Invoke(this, new FocusedWindowEventArgs(oldWindow, newWindow));
}
}
