internal static Point ScreenToClient(Point ptScreen, PresentationSource presentationSource)
{
// For now we only know how to use HwndSource.
HwndSource inputSource = presentationSource as HwndSource;
if (inputSource == null)
{
return(ptScreen);
}
HandleRef handleRef;
new UIPermission(UIPermissionWindow.AllWindows).Assert(); // BlessedAssert:
try
{
handleRef = new HandleRef(inputSource, inputSource.Handle);
}
finally
{
UIPermission.RevertAssert();
}
// Convert the point from screen coordinates back to client coordinates.
NativeMethods.POINT ptClient = new NativeMethods.POINT((int)ptScreen.X, (int)ptScreen.Y);
SafeNativeMethods.ScreenToClient(handleRef, ptClient);
// MITIGATION: WIN32_AND_AVALON_RTL
//
// When a window is marked with the WS_EX_LAYOUTRTL style, Win32
// mirrors the coordinates during the various translation APIs.
//
// Avalon also sets up mirroring transforms so that we properly
// mirror the output since we render to DirectX, not a GDI DC.
//
// Unfortunately, this means that our coordinates are already mirrored
// by Win32, and Avalon mirrors them again. To work around this
// problem, we un-mirror the coordinates from Win32 before hit-testing
// in Avalon.
//
int windowStyle = SafeNativeMethods.GetWindowStyle(handleRef, true);
if ((windowStyle & NativeMethods.WS_EX_LAYOUTRTL) == NativeMethods.WS_EX_LAYOUTRTL)
{
NativeMethods.RECT rcClient = new NativeMethods.RECT();
SafeNativeMethods.GetClientRect(handleRef, ref rcClient);
ptClient.x = rcClient.right - ptClient.x;
}
return(new Point(ptClient.x, ptClient.y));
}
/// <summary>
/// Convert a point from the coordinate space of the screen into
/// the "client" coordinate space of a window.
/// </summary>
internal static Point ScreenToClient(Point pointScreen, PresentationSource presentationSource)
{
// For now we only know how to use HwndSource.
HwndSource inputSource = presentationSource as HwndSource;
if (inputSource == null)
{
return(pointScreen);
}
HandleRef handleRef = new HandleRef(inputSource, inputSource.CriticalHandle);
NativeMethods.POINT ptClient = FromPoint(pointScreen);
SafeNativeMethods.ScreenToClient(handleRef, ptClient);
ptClient = AdjustForRightToLeft(ptClient, handleRef);
return(ToPoint(ptClient));
}