Hi Antonio, And happy new year !
Thanks for you answer. I understand that SHOW would possibly make some of the
situations quicker. But even if GTK 3 is drawing the matrix twice, don't you
think it is quite weird that simple scrolling around elements that are not so
complex (graphically I mean) is that slow ? I'm just trying to figure out what
is happening when scrolling, except drawing. Is IupMatrix doing some complex
stuff when scrolled ? I guess some profiling could be great here, since I'm
quite sure it is note related to my particular use.
Thanks anyway, it's great to hear you could investigate !
Best regards.
Johann Le dimanche 3 janvier 2021 à 19:53:18 UTC+1, Antonio Scuri
<antonio.sc...@gmail.com> a écrit :
Hi,
The SHOW attribute will scroll only if the given cell is not visible.
The ORIGIN attribute always positions the given cell at the top left corner
regardless if it was visible or not.
A matrix with lots of lines will be slow only if its lines are visible. The
matrix renders only the visible cells.
Scrolling with the wheel is slow because it will redraw many times, one for
every wheel event which is usually much more that the scrollbar itself being
dragged.
Scrolling with ORIGIN shouldn't be a problem. One thing that occurs to me is
that the scrollbar must be also updated, if you turn off the scrollbars the
process may be faster, but you will be able to scroll only using the ORIGIN
attribute. But you can turn it off only when performance is needed, for
instance.
I notice that in GTK 3 a scroll is drawing the matrix twice. I don't think it
is a GTK problem. It may be something related with the redraw function we use,
but I couldn't solve it.
Best,Scuri
Em qua., 2 de dez. de 2020 às 12:27, Johann Philippe via Iup-users
<iup-users@lists.sourceforge.net> escreveu:
Duration is between 5 and 7 milliseconds per matrix when setting "ORIGIN"
attribute.
Le mercredi 2 décembre 2020 à 16:02:11 UTC+1, Johann Philippe via Iup-users
<iup-users@lists.sourceforge.net> a écrit :
Dear all,
I'm using several IupMatrix (more than 10, can be up to 20) in my musical
application (on Linux, mint 20), and those matrixes can have a lot of lines.
I noticed that scrolling is a bit slow when I scroll with mouse wheel.And it's
even worst when the scrolling is done programatically with the "ORIGIN"
attribute.
When I say slow, I mean it's more than a few milliseconds, which is a big deal
in a musical software, where many graphic elements are redrawn at something
like 30 frame per second. In some context, the matrixes "ORIGIN" attribute can
be reset several times per second, which is slowing the other graphical
elements.
Is it related to the IupMatrix itself ?
Is there a quicker way to scroll programatically? Is the "SHOW" attribute
quicker ? And if so, I couldn't find a way to make it work.
Thank you !
Johann
_______________________________________________
Iup-users mailing list
Iup-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/iup-users
_______________________________________________
Iup-users mailing list
Iup-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/iup-users
_______________________________________________
Iup-users mailing list
Iup-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/iup-users
