Why is updating my uitable slowing down my app?

Question

Michael Van de Graaff 2022-6-3

1
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https://ww2.mathworks.cn/matlabcentral/answers/1732780-why-is-updating-my-uitable-slowing-down-my-app

评论： Matheus Sozza 2023-1-22

采纳的回答： Michael Van de Graaff

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Why does my uitable get sluggish when i'm updating it?

(Solved, posted for community reference)

I have an app. The app has a table. The table is updated as i use the app, either manually or programatically.

The table is updated, and if a condition in the code is met, I change the color of a cell to indicate that visually. this is done using the addStyle (https://www.mathworks.com/help/matlab/ref/matlab.ui.control.table.addstyle.html) function. If a different conditions is met, I switch the style back to what it was, again using addStyle. I did not remove the old styles

DON'T FORGET TO REMOVE STYLES!! The styles simply accumulate in the uitable object.

Here is a MWE demonstrating how this happens:

f = uifigure;
t = uitable(f);
t.Data = magic(4);
nsty = 80;
tic
for ii = 1:10
    timetable(t,nsty)
    removeStyle(t); %Clean up clean up everybody do your share! 
end
toc
disp("And now just YOLOing it.")
tic 
for ii = 1:10
    timetable(t,nsty) %now we are not removing the styles, the loop will slow way down.
end
toc
function timetable(t,nstyle)
for ii = 1:nstyle
    c = [rand(),rand(),rand()];
    s = uistyle('BackgroundColor',c);
    addStyle(t,s,'column',2)
end
 a = t.StyleConfigurations;
var = whos('a');
disp(['The size (in bytes) of the StyleConfigurations field of the table is ',num2str(var.bytes)])
end