private void OnFocusChanged(object sender, AutomationFocusChangedEventArgs e)
{
try
{
AutomationElement elementFocused = sender as AutomationElement;
if (IsInvalidAutomationElement(elementFocused))
{
return;
}
AutomationElement newTopLevelWindow = GetTopLevelWindow(elementFocused);
if (IsInvalidAutomationElement(newTopLevelWindow))
{
return;
}
if (newTopLevelWindow != lastTopLevelWindow)
{
if (IsExplorerWindow(lastTopLevelWindow))
{
RemoveSelectionEvenhandler(lastTopLevelWindow);
}
if (IsExplorerWindow(newTopLevelWindow))
{
Debug.WriteLine("Focus moved to new top-level explorer window " + newTopLevelWindow.Current.Name);
AddSelectionEvenhandler(newTopLevelWindow);
ExplorerWindowGotFocus?.Invoke(this, new IntPtr(newTopLevelWindow.Current.NativeWindowHandle));
}
else
{
Debug.WriteLine("Focus moved to new top-level non-explorer window " + newTopLevelWindow.Current.Name);
}
lastTopLevelWindow = newTopLevelWindow;
}
}
catch (ElementNotAvailableException ex)
{
Debug.WriteLine("SelectionMonitor: Fail OnFocusChanged " + ex.ToString());
}
}
private void OnMessage(XDMessageEventArgs msg)
{
if (msg.DataGram.Channel == "SelectionOfExplorerWindowChanged")
{
if (int.TryParse(msg.DataGram.Message, out int hwndInteger))
{
IntPtr hwnd = new IntPtr(hwndInteger);
ExplorerSelectionChanged?.Invoke(this, new ExplorerMonitorEventArgs(hwnd));
}
}
else if (msg.DataGram.Channel == "ExplorerWindowGotFocus")
{
if (int.TryParse(msg.DataGram.Message, out int hwndInteger))
{
IntPtr hwnd = new IntPtr(hwndInteger);
ExplorerWindowGotFocus?.Invoke(this, new ExplorerMonitorEventArgs(hwnd));
}
}
}
