2018 R2 Canvas Flickering

[Chad_Posner]

Yes! @ You can download it from the feedback case.

Seems like William fixed it.

[anon20074439]

Oh William also highlighted the line in the listbox code that was causing the canvas painting issue as well as fixing the flicker. Hopefully that fixes everything?

[Chad_Posner]

@400245:@

Oh William also highlighted the line in the listbox code that was causing the canvas painting issue as well as fixing the flicker. Hopefully that fixes everything?

Yea. There’s a bug with the listbox which worsened in R2 where cell borders eat up CPU. I’ll be submitting a case for that. Do you have any workarounds for cell borders?

[anon20074439]

@400247:@Chad Posner

Do you have any workarounds for cell borders?

You’re referring to the line William highlighted?

If you move:

CellBorderRight(row, column) = ListBox.BorderThinSolid

from SuperListBox.CellBackgroundPaint to after:

Cell(LastIndex, j) = col //recordArray(i)//rs.IdxField(i+1).StringValue

e.g.

CellBorderRight(lastIndex, j) = ListBox.BorderThinSolid

in SuperListBox.Populate and any other places you want to set it rather than putting it inside the CellBackgroundPaint event then things should work as expected.

[anon20074439]

Also, if you change the Invalidate to a Refresh(false) at the bottom of CanvasListbox.DrawListBox then you will get a much smoother scroll.