Multicolumn Listbox slow

[Tesla1977]

Recoloring cells in my multicolumn listbox is slow (1000 lines x 5-10 columns).

Yes, panel updates are already deferred. Problem is, that the users can add lines at the top of the listbox, and then every line below that has to recolor.

I will test the virtual MCLB that someone mentioned, but perhaps there is the option to change the indicator?

Is a table faster than a MCLB?

A line has only a single color, no need to color for every single cell.

[GerdW]

Hi Tesla,

to increase speed you only need to color the lines visible to your user.

(I guess the user cannot see all 1000 lines at once?)

[Tesla1977]

Thank you.

I already mentioned that I will try the virtual MCLB, but perhaps there is an easier way.

[GerdW]

Hi Tesla,

I never heard of a "virtual MCLB" which "somebody mentioned".

Do you mind to provide links or example VIs?

[Tesla1977]

https://lavag.org/topic/15289-virtual-multicolumn-listbox/?ct=1552906330

[GerdW]

Hi Tesla,

I already mentioned that I will try the virtual MCLB, but perhaps there is an easier way.

That VirtualMCLB is using the same approach of only coloring the cells visible to the user as I suggested before…

[Tesla1977]

Yes, it is a possible solution, but perhaps there is an easier way.

That was the whole purpose of my post.

[daveTW]

I was curious and tested the performance by myself. I think, this is good enough...

[Tesla1977]

Thanks for your testing.

Just for clarifying:

My user adds a new line at the red position. Then I have to recolor every single line after that. And there are sometimes above 1000 lines.

[daveTW]

Yes, after reading your first post more carefully I realized my misunderstanding. And now I see, you mean the Font-Color, not the cell (background) color. The performance of this is very poor, see my third testing- VI. I think, GerdW's suggestion is the right way- first recolor all visible lines, then all the others.