wanting to try a GUI toolkit: needing some advice on which one to choose

[drug]

02.06.2021 12:50, Ola Fosheim Grøstad пишет:
> Depends on the data, I guess, if they are all visible at once then you 
> basically have to very carefully write your own GPU render stage for 
> that view and carefully cache things that does not move by rendering 
> them to buffers (in GPU memory).

Usually 1 million of items aren't visible at once. Also there is opinion 
that total redrawing can be more efficient than caching because of 
making a decision what to cache and what not can be very complex.

> But if you deal with large number of items you basically can write your 
> own view and dynamically create elements as the user scrolls. You do 
> need to estimate the height though.

To estimate the height you need to have height of every elements, you 
can't dynamically create elements in that case. I create some wrapper 
over data set that stores height of elements. It's much cheaper and 
faster than creating a widget per item - that is a real advantage over 
retained gui. And user has access to that info - that is advantage over 
immediate gui. But yes, there are tasks that can/should be performed by 
dynamically created elements.