Re: mouse handling doesn't looks correct

[Thomas Dickey]

On Mon, Jan 25, 2021 at 06:42:36PM +0100, Pavel Stehule wrote:
> Hi
> 
> I try to implement drag support for my ncurses application. I found an
> example
> 
> https://gist.github.com/sylt/93d3f7b77e7f3a881603#file-ncurses_mouse_movement-c
> 
> It worked almost well, with two exceptions.

Just reading the source code, I see an error: the printf's are not fflush'd.
As a result, the control sequence may be corrupted and ignored.
 
I have an equivalent test in ncurses (test/ncurses.c, menu A or a).
That works fairly reliable (with xterm of course).

Wheel mice are a special problem, if you attempt to push button 2
(the wheel itself), that's likely to produce other buttons (6 or 7).
But I recall improving that a while back (and in my quick check,
it seems okay: just reporting position).

> When I use the mouse wheel, the mouse is in some strange state, and when I
> try to move with the mouse, then it generates events like the left button
> is pressed, but no button is pressed. After left click the behaviour is
> returned to normal.
> 
> Second issue, that I can see, are a few false events. Although I did only
> mouse move, it generates the same mouse event like mouse click.
> 
> Name         : ncurses
> Version      : 6.2
> Release      : 3.20200222.fc33
> Architecture : x86_64
> Size         : 608 k
> Source       : ncurses-6.2-3.20200222.fc33.src.rpm
> Repository   : @System
> >From repo    : anaconda
> Summary      : Ncurses support utilities
> URL          : https://invisible-island.net/ncurses/ncurses.html
> License      : MIT
> 
> Is there some way to implement drag correctly?
> 
> Regards
> 
> Pavel Stehule

-- 
Thomas E. Dickey <dickey@invisible-island.net>
https://invisible-island.net
ftp://ftp.invisible-island.net

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