Synchronizing grid scrollbars to another control

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UltraGrid

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Juha posted over 16 years ago

Hi! I have an issue with scrolling. I have my custom drawn controls that are overlayed over the grid, meaning they're not attached to it in any way, rather having a dedicated manager that manages the interaction. Problem arrises when i want to scroll the grid horizontally and i want my overlays to synchronize their movement too. I'm using AfterColRegionScroll event where i calculate the movement and move overlays accordingly and it works fine except for the flicker that's there because scroll happens first and then overlays move. Now, is there any way to do it simultaneously? i know that it's not a grid issue per se, but i'm sure you guys encountered similar problems with other users. Thanx, M.

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Juha posted over 16 years ago in reply to Mike Saltzman

hi mike! thanx for yr reply. i tried using the events and Begin/EndUpdate like u suggested, but it doesn't really do the trick. hiding and showing controls does and works fine on a small scale, but can't really track when doing rapid scrolling. anyway, i'm gonna work on this and make it usable! thanx again!
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Offline Mike Saltzman posted over 16 years ago

I don't know of any way to do this for sure, it will require a bit of experimentation. You might want to try stopping the grid from painting until you have moved all of your controls and see if that helps. What you could do is use the BeforeColRegionScroll event and call grid.BeginUpdate. This will prevent the grid from painting.
Then in AfterColRegionScroll, you could position your own controls and then call EndUpdate on the grid to let it paint again.
I'm not sure how much that will help, if any, but it seems like it might be worth a shot.
Or perhaps what you can do is hide your controls in BeforeColRegionScroll and then move them and re-show them in the After event?
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