This question is about WM_LBUTTONDOWN with regards to client area. Discussion will include examples from Scribble, step6.
Definitions in VC++
The part of a window where the application displays output such as text or graphics.
The WM_LBUTTONDOWN message is posted when the user presses the left mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.
afx_msg void OnLButtonDown( UINT nFlags, CPoint point );
Note This member function is called by the framework to allow your application to handle a Windows message. The parameters passed to your function reflect the parameters received by the framework when the message was received. If you call the base-class implementation of this function, that implementation will use the parameters originally passed with the message and not the parameters you supply to the function.
In scribble, I can move the mouse outside of the view as well as outside the application window, and still capture the mouse position. Why does this happen? Can I capture the mouse only when it is in my view? WM_LBUTTONDOWN states that I should only be capturing it in my client area. I believe my client area is only my view.