Windows emacs menu bar redraw

Windows emacs menu bar redraw

[Dave Schuyler]

Hi,

I'm using gnu emacs 21.2.1 on Windows 2000.

I've noticed that the menu bar will sometimes flicker and redraw.  I've seen this before in applications where some controls are bing told to redraw themselves, not just as needed, but very often.  The programmer may miss a bug like this because the redraw is exactly the same as what was there before, and if it's fast enough, or if there is no blanking, you can't see it.  If your machine slows down with other tasks, the flicker can become bothersome.  Also, the redraw is needlessly using cpu time.  Worse, someone else may immitate the code doing the needless redraws, thinking that there is nothing broken with the original code.

Anyway, it would be nice if someone would take care of it.

Thanks.




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Re: Windows emacs menu bar redraw

[Andrew Choi]

parameter@go.com (Dave Schuyler) writes:

> Hi,
> 
> I'm using gnu emacs 21.2.1 on Windows 2000.
> 
> I've noticed that the menu bar will sometimes flicker and redraw.
> I've seen this before in applications where some controls are bing
> told to redraw themselves, not just as needed, but very often.  The
> programmer may miss a bug like this because the redraw is exactly
> the same as what was there before, and if it's fast enough, or if
> there is no blanking, you can't see it.  If your machine slows down
> with other tasks, the flicker can become bothersome.  Also, the
> redraw is needlessly using cpu time.  Worse, someone else may
> immitate the code doing the needless redraws, thinking that there is
> nothing broken with the original code.
> 
> Anyway, it would be nice if someone would take care of it.
> 
> Thanks.

Hi,

Does the problem go away if you call Fequal instead of EQ in w32menu.c
(set_frame_menubar) to check the previous_items array against
menu_items?

Andrew.