title: What is the best way to show a WPF window at the mouse location (to the top left of the mouse)?
body: <p>I have found that this works PART of the time by inheriting the Windows Forms mouse point and subtracting out the height and width of my window to set the left and top (since my window's size is fixed):</p>
  
  <pre><code>MyWindowObjectThatInheritsWindow window = new MyWindowObjectThatInheritsWindow();
  System.Windows.Point mouseLocation = GetMousePositionWindowsForms();
  window.Left = mouseLocation.X - 300;
  window.Top = mouseLocation.Y - 240;
  window.Show();
  </code></pre>
  
  <p>Edit: Here is the code for getting the mouse position...</p>
  
  <pre><code>public System.Windows.Point GetMousePositionWindowsForms()
  {
      System.Drawing.Point point = System.Windows.Forms.Control.MousePosition;
      return new System.Windows.Point(point.X, point.Y);
  }
  </code></pre>
  
  <p>Note that this works by making the bottom right edge of the window touch the top left of your mouse cursor. But this breaks for different screen resolutions, or maybe multiple monitors with different resolutiosn? I haven't fully narrowed it down yet, but I just tried this same code on another PC, and it seems to spawn the window not to the top left of the mouse cursor, but to the bottom left of it, and a good distance past it...</p>
  
  <p>I should probably add that my window sizes to content, width and height, so I can't just use the ActualWidth and ActualHeight properties since they're not available. Perhaps the issue is in getting that sizing right? Is there any way to do that? I know for sure the 300 and 240 is correct according to my main PC with two monitors running 1920x1080 resolutions, as I have calculated the widths and heights of all the objects in my window which I have explicitly sized. Edit: Just tried explicitly setting the height and width to 240/300, to ensure that the window is no longer sized to content, and I still have this issue when subtracting out the actual height and width!</p>
  
  <p>Any ideas?</p>