WPF: Converting between screen coordinates and WPF coordinates

Question

I understand that WPF coordinates are different from \"real\" screen coodinates (pixel coordinates) if the computer is not using the default DPI setting. In my program I wan

Answer 1

Does this work if you place it in the code-behind for your Window?

protected override void OnContentRendered(System.EventArgs e)
{
    base.OnContentRendered(e);
    MoveToLowerRightCorner();
}

private void MoveToLowerRightCorner()
{
    var workingArea = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea;
    var transform = PresentationSource.FromVisual(this).CompositionTarget.TransformFromDevice;
    var corner = transform.Transform(new Point(workingArea.Right, workingArea.Bottom));
    this.Left = corner.X - this.ActualWidth;
    this.Top = corner.Y - this.ActualHeight;
}

Answer 2

1. Which screen a WPF window is on:

   private static Screen GetScreen(Window window)
   {
      return Screen.FromHandle(new WindowInteropHelper(window).Handle);
   }
   

2. Open another window in the bottom-left corner of the same screen:

   static Point RealPixelsToWpf(Window w, Point p)
   {
       var t = PresentationSource.FromVisual(w).CompositionTarget.TransformFromDevice;
       return t.Transform(p);
   }
   private static void SetPositionBottomLeftCorner(Window sourceWindow, Window targetWindow)
   {
       var workingArea = GetScreen(sourceWindow).WorkingArea;
       var corner = RealPixelsToWpf(sourceWindow, new Point(workingArea.Left, workingArea.Bottom));
       targetWindow.Left = corner.X;
       targetWindow.Top = corner.Y - targetWindow.ActualHeight;
   }