Window ActualTop, ActualLeft

Question

What is the correct way to retrieve a window\'s position in WPF?

Here\'s some attempts I made. First attempt, the obvious

Point GetPosition(Window wi         


        

Answer 1

Here's a solution that builds on P/Invoke of GetWindowRect, but uses extension methods to make your code look nicer. You use myWindow.ActualTop() and myWindow.ActualLeft() in your code.

static class WindowExtensions
{
    [StructLayout(LayoutKind.Sequential)]
    struct RECT
    {
        public int Left;
        public int Top;
        public int Right;
        public int Bottom;
    }
    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);


    public static double ActualTop(this Window window)
    {
        switch (window.WindowState)
        {
            case WindowState.Normal:
                return window.Top;
            case WindowState.Minimized:
                return window.RestoreBounds.Top;
            case WindowState.Maximized:
                {
                    RECT rect;
                    GetWindowRect((new WindowInteropHelper(window)).Handle, out rect);
                    return rect.Top; 
                }
        }
        return 0;
    }
    public static double ActualLeft(this Window window)
    {
        switch (window.WindowState)
        {
            case WindowState.Normal:
                return window.Left;
            case WindowState.Minimized:
                return window.RestoreBounds.Left;
            case WindowState.Maximized:
                {
                    RECT rect;
                    GetWindowRect((new WindowInteropHelper(window)).Handle, out rect);
                    return rect.Left;
                }
        }
        return 0;
    }
}