Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!bbn!rochester!pt.cs.cmu.edu!andrew.cmu.edu!rj0z+
From: rj0z+@andrew.cmu.edu (Robert George Johnston, Jr.)
Newsgroups: comp.sys.mac.programmer
Subject: Calling WDefProcs Manually
Message-ID: <AY9iCNy00VE10-dWJ3@andrew.cmu.edu>
Date: 22 Mar 89 00:06:49 GMT
Organization: Class of '91, Carnegie Mellon, Pittsburgh, PA
Lines: 37


    Here's an interesting problem. Suppose you are calling FindWindow to
determine the window and part of a window that was clicked after getting
a mouseDown event. One would call (in LSC):

    WindowPart = FindWindow(TheEvent->where, &TheWindow);

    You may then determine if the title bar of a window was clicked upon
by simply:

    if (WindowPart == inDrag) ...
    Unless the window that was clicked on is a DA window, then the above
statement is false, because (WindowPart == inSysWindow).
    The problem is that I need to determine if the title bar of a window
was clicked regardless if it is an application's window, or a system
window (DA).
    I devised the following solution, but it does not work. Consider:

    if (WindowPart == inSysWindow) {
        VarCode = GetWVariant(TheWindow);
        Result = CallPascalL(VarCode, TheWindow, wHit, TheEvent->where,
            *((WindowPeek) TheWindow)->windowDefProc);
        ...
        }

    Result is defined as a long, and VarCode is an int.
    The theory behind this statement is that I will call the windowDefProc
myself, passing all of the neccessary information to it, and it will tell
me if the title bar (dragRgn) was hit.
    Problem: Result is always zero (0). This is especially confusing to
me because the reason that this statement is called is because the event
detected a mouseDown in a window, and then the windowDefProc turns around
and says that the window was NOT hit.
    Anybody have any idea why this is not working?
    Thank you.

    Rob Johnston.