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From: bradn@tekig4.TEK.COM (Bradford Needham)
Newsgroups: comp.sys.mac
Subject: Custom Dragging?
Message-ID: <1462@tekig4.TEK.COM>
Date: Mon, 4-May-87 19:50:48 EDT
Article-I.D.: tekig4.1462
Posted: Mon May  4 19:50:48 1987
Date-Received: Tue, 5-May-87 07:12:06 EDT
Reply-To: bradn@tekig4.UUCP (Bradford Needham)
Distribution: world
Organization: Tektronix, Inc., Beaverton, OR.
Lines: 23
Keywords: custom dragcntl control

How do you implement custom dragging in a custom control?  Inside
Macintosh's description is either misleading or just wrong (I can't
tell which); Macintosh Revealed says nothing about custom controls; I
haven't seen or heard of a technical note on the subject -- I'm at my
wit's end!

Using Aztec C, I've successfully built custom controls containing fancy
drawCntl, testCntl, calcCRgns, initCntl, dispCntl, posCntl, and
thumbCntl routines, but the workings of dragCntl escape me.

The symptom I get is that if my dragCntl routine returns a nonzero
value (to tell the control manager that I'm doing custom dragging),
TrackControl returns 0 (saying that the mouse was released outside any
interesting part of the control).

Looking at the Inside Macintosh description of custom dragging, I don't
see how the necessary information can possibly be communicated between
TrackControl and a custom control.

Has anyone successfully built custom dragging?  How did you do it?

Thanks,
Brad Needham