How to fast color the current mouse-hovered row in MultiColumnBox

Question

Hi,
I'm trying to color in a very efficient way the current mouse-hovered row in MutliColumnBox... however, it turns out to be pretty slow...?
Any idea about how to make it (much) faster?
Find attached my current way of achieving this purpose... a bit slow and plus the ActiveCell {-2, -2} considered all the cells... including the row and column headers (how to avoid this by the way ?) (No way to avoid to repainting the headers... after all?)
EDIT: I tried to defer the visual updates on the Front Panel but no big improvements so far.
Thanks,
Ehouarn
Attachments:
Color Mouse Hovered Row in MultiColumnListBox.vi ‏12 KB

Answer 1

Ehouarn wrote:
however, it turns out to be pretty slow...?
Your example VI runs quite well on my computer (LV 2011, pretty old Dell laptop with an i7). I don't notice any slowness at all, even when moving the cursor up and down quickly. Maybe it's something with LV 2010 or with your computer specifically?
One possible workaround for things like this (if you can't find another solution) is not to run the update on every mouse move, but rather throttle it. There are a number of ways of doing this. One example is to move the code to the timeout case and set the timeout value through a shift register. The move event sets it to N (let's say 20) and the timeout event sets it to -1. That way, the code runs once, N ms after the last move event.
And no, -2 will always grab the headers too. Your code is the only way I know of to fix it. Maybe it will work if you hide and show the headers, but I haven't tried it and I'm guessing it won't.
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