带有自定义镶边的最大化窗口的位置

Question

I've created a window with a custom chrome by:

1. Handling WM_NCHITTEST and returning the appropriate values for the window caption and borders,
2. Swallowing WM_NCPAINT (and WM_NCUAHDRAWCAPTION , WM_NCUAHDRAWFRAME ),
3. Handling WM_SETTEXT , WM_SETICON and WM_NCACTIVATE with DefWindowProc by temporarily removing WM_VISIBLE ,
4. Handling WM_WINDOWPOSCHANGED to apply a window region for rounded corners.

Moving/Resizing is handled fine by Windows. I added WS_THICKFRAME to the window styles to enable Aero Snap functionality. But now when the window is maximized it is positioned at (-5,-5) and my custom titlebar is cut off (this doesn't happen without WS_THICKFRAME ).

What is the proper way to fix that? What influences that position? It seems to be unrelated to values returned for WM_NCHITTEST .

Answer 1

Late answer, but it seems like noone else has answered.

You can check when the window is maximized and account for the margin when the window is maximized. You may want to handle WM_NCCALCSIZE rather than WM_NCPAINT to make the entire window appear as client area, rather than painting the non-client area.

This describes one approach to implementing custom chrome (I was the author): http://blogs.msdn.com/b/wpfsdk/archive/2008/09/08/custom-window-chrome-in-wpf.aspx

Hope that helps,