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Re: Strange behaviour of scrollbars on MacOSX

From: Steven Tamm
Subject: Re: Strange behaviour of scrollbars on MacOSX
Date: Sun, 2 May 2004 22:33:28 -0700

The scrollbar thumb code is the most tetchy of the gui code. It is trying to emulate the "Mac" way of doing things by modifications to the NT scroll-bar code. But it is very difficult to handle the thumb correctly. This is because Carbon "wants" you to use TrackMousePosition and block waiting for a change in the mouse. Instead we are doing the thumb handling by hand.

For example, it responds differently to a "hold" on the thumb vs. a "click" on the thumb. Try it and you'll see. There's a bug there someplace, and I would suspect it's someplace in x_scroll_bar_report_motion. I couldn't get a real stack trace for the call to report_motion (from XTmouse_position)

I can't debug this just now; if anyone can help it would be much appreciated.


On May 2, 2004, at 4:32 AM, Piet van Oostrum wrote:

With CVS Carbon Emacs on MacOSX the scrollbars behave quite strangely
compared to other MacOSX applications, and I would say, probably strange
compared to other OSs.

In another application when you click on the blue slider in the scrollbar and don't move the mouse, everything stays as it was, no scrolling takes place. On MacOSX, however, when you do this, either the scrollbar changes
position (just when you click on it) or the scrollbar stays put but the
text scrolls. Sometimes it is possible to scroll through your buffer
(probably with gaps) with repeatedly clicking on the same location in the slider without moving the mouse. Sometimes it goes back and forth. I know that emacs has different ideas about scrollbars but is there a way to get
the same behaviour as other apps?
Piet van Oostrum <address@hidden>
URL: http://www.cs.uu.nl/~piet [PGP]
Private email: address@hidden

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