public static Point GetAbsolutePosition(this Window w)
{
if (w.WindowState != WindowState.Maximized)
{
return(new Point(w.Left, w.Top));
}
Int32Rect r;
bool multimonSupported = OSInterop.GetSystemMetrics(OSInterop.SM_CMONITORS) != 0;
if (!multimonSupported)
{
OSInterop.RECT rc = new OSInterop.RECT();
OSInterop.SystemParametersInfo(48, 0, ref rc, 0);
r = new Int32Rect(rc.left, rc.top, rc.width, rc.height);
}
else
{
WindowInteropHelper helper = new WindowInteropHelper(w);
IntPtr hmonitor = OSInterop.MonitorFromWindow(new HandleRef(null, helper.EnsureHandle()), 2);
OSInterop.MONITORINFOEX info = new OSInterop.MONITORINFOEX();
OSInterop.GetMonitorInfo(new HandleRef(null, hmonitor), info);
r = new Int32Rect(info.rcMonitor.left, info.rcMonitor.top, info.rcMonitor.width, info.rcMonitor.height);
}
return(new Point(r.X, r.Y));
}
/// <summary>
/// Constrain mouse cursor to the area of the specified UI element.
/// </summary>
/// <param name="element">Target UI element.</param>
/// <returns>True on success.</returns>
public static bool ClipCursor(FrameworkElement element)
{
const double dpi96 = 96.0;
var topLeft = element.PointToScreen(new Point(0, 0));
PresentationSource source = PresentationSource.FromVisual(element);
if (source?.CompositionTarget == null)
{
return(false);
}
double dpiX = dpi96 * source.CompositionTarget.TransformToDevice.M11;
double dpiY = dpi96 * source.CompositionTarget.TransformToDevice.M22;
var width = (int)((element.ActualWidth + 1) * dpiX / dpi96);
var height = (int)((element.ActualHeight + 1) * dpiY / dpi96);
OSInterop.RECT rect = new OSInterop.RECT
{
left = (int)topLeft.X,
top = (int)topLeft.Y,
right = (int)topLeft.X + width,
bottom = (int)topLeft.Y + height
};
return(OSInterop.ClipCursor(ref rect));
}
