private static void GenerateMouseSequence(MouseButtonEventArgs args, IntPtr hitWindow, Native.Platform.Structs.Point screenPoint, int hitTestResult)
{
var isHitTestNonClient = IsHitTestResultNonClient(hitTestResult);
var messageFromMouseEvent = GetWindowsMessageFromMouseEvent(args, isHitTestNonClient);
if (messageFromMouseEvent == 0)
{
return;
}
var ancestor = User32.GetAncestor(hitWindow, 2);
var lParam = NativeMethods.MakeParam(hitTestResult, messageFromMouseEvent);
bool flag1;
bool flag2;
switch (User32.SendMessage(hitWindow, 33, ancestor, lParam)
.ToInt32())
{
case 1:
flag1 = flag2 = true;
break;
case 2:
flag1 = true;
flag2 = false;
break;
case 3:
flag1 = false;
flag2 = true;
break;
default:
flag1 = flag2 = false;
break;
}
if (flag1)
{
User32.SetActiveWindow(ancestor);
}
if (!flag2)
{
return;
}
if (isHitTestNonClient)
{
User32.SendMessage(hitWindow, messageFromMouseEvent, new IntPtr(hitTestResult), NativeMethods.MakeParam(screenPoint.X, screenPoint.Y));
}
else
{
Native.Platform.Structs.Point point = screenPoint;
User32.ScreenToClient(hitWindow, ref point);
User32.SendMessage(hitWindow, messageFromMouseEvent, NativeMethods.MakeParam(PressedMouseButtons, GetXButtonWparam(args)), NativeMethods.MakeParam(point.X, point.Y));
}
}
private static void Current_PostProcessInput(object sender, ProcessInputEventArgs e)
{
if (_isSpoofingInput)
{
return;
}
if (!(e.StagingItem.Input is MouseButtonEventArgs input) || input.RoutedEvent != Mouse.PreviewMouseDownOutsideCapturedElementEvent || input.Handled)
{
return;
}
int messagePos = User32.GetMessagePos();
var point = new Native.Platform.Structs.Point
{
X = NativeMethods.GetXlParam(messagePos),
Y = NativeMethods.GetYlParam(messagePos)
};
var num = User32.WindowFromPoint(point);
if (!User32.IsWindow(num))
{
return;
}
if ((int)User32.GetWindowThreadProcessId(num, out var _) != (int)Kernel32.GetCurrentThreadId())
{
return;
}
try
{
_isSpoofingInput = true;
var hwndSource = HwndSource.FromHwnd(num);
var hitTestResult = HitTest(num);
if (hwndSource != null && !IsHitTestResultNonClient(hitTestResult))
{
return;
}
Mouse.Capture(null);
GenerateMouseSequence(input, num, point, hitTestResult);
}
finally
{
_isSpoofingInput = false;
}
}
