private void DpiAwareWindow_SourceInitialized(object sender, EventArgs e)
{
this.source = (HwndSource)PresentationSource.FromVisual(this);
this.source.AddHook(this.WindowProcedureHook);
// Determine if this application is Per Monitor DPI Aware.
this.isPerMonitorEnabled = DpiAwareApi.GetProcessDpiAwareness() == PInvoke.PROCESS_DPI_AWARENESS.PROCESS_PER_MONITOR_DPI_AWARE;
// Is the window in per-monitor DPI mode?
if (this.isPerMonitorEnabled)
{
// It is. Calculate the DPI used by the System.
this.SystemDpi = DpiAwareApi.SystemDPI;
// Calculate the DPI used by WPF.
this.WpfDpi = new Point
{
X = (int)(96 * this.source.CompositionTarget.TransformToDevice.M11),
Y = (int)(96 * this.source.CompositionTarget.TransformToDevice.M22)
};
// Get the Current DPI of the monitor of the window.
this.CurrentDpi = DpiAwareApi.GetDpiForWindow(this.source.Handle);
// Calculate the scale factor used to modify window size, graphics and text.
this.ScaleFactor = new Point
{
X = this.CurrentDpi.X / this.WpfDpi.X,
Y = this.CurrentDpi.Y / this.WpfDpi.Y
};
// Update Width and Height based on the on the current DPI of the monitor
this.Width = this.Width * this.ScaleFactor.X;
this.Height = this.Height * this.ScaleFactor.Y;
// Update graphics and text based on the current DPI of the monitor.
this.UpdateLayoutTransform(this.ScaleFactor);
}
}
public static Dpi GetDpi(this HwndSource hwndSource, PInvoke.MONITOR_DPI_TYPE dpiType = PInvoke.MONITOR_DPI_TYPE.MDT_DEFAULT)
{
return(DpiAwareApi.GetDpiForWindow(hwndSource.Handle, dpiType));
}