DataGrid / UI does not update consistently [Solved?]

[mrcoollion]

Hi all,

I have the problem that a Datagrid does not update consistently during the running of a loop. Sometimes it does and sometimes I just see a bussy Cursor icon and it only updates after the loop has finished.
It seems to be depending on the number of updates and the time between the adding or changing of a line in the datagrid. When there are many updates in a short time I only see the busy cursor and the Datagrid only updates at the end of the loop, and when there are fewer updates it updates the Datagrid with every added or changed line.

Any idea's how to solve this without significantly slowing down the loop?

Kind regards,

Paul

[dunbarx]

How do you update? Do you:

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dispatch "ResetList" to group "yourDataGrid"

Craig

[mrcoollion]

Hello Craig,

For adding a line I use:

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put  tNewPositionNbr into theLineNo
dispatch "AddData" to group "DG_SimulatedTrades" with theDataA, theLineNo

For updating a line I use:

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set the dgDataOfLine[tPositionNbr] of group "DG_SimulatedTrades" to pDataA

Regards,

Paul

[stam]

Hi Paul,

I think Craig was giving you the answer rather than asking a question

Personally if updating single lines, i'd call refreshLine after updating data or adding data:

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dispatch "RefreshLine" to group "DataGrid" with pLines

If you're doing a whole lot of updates, i'd use something like what Craig says instead of refreshing individual lines, but my preference is using refreshList to update the whole data grid instead:

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dispatch "RefreshList" to group "DataGrid"

In other words, after running your loop changing multiple records, call this at the end.


hope that helps,
Stam

[dunbarx]

Stam reads me like a book.

I wish I did.

But, Stam, what is different between your post and mine?

Craig

[stam]

But, Stam, what is different between your post and mine?

Not much in real terms i suspect. Some theoretical differences:

ResetList redraws the data grid data after having copied in fresh copies of any templates. Potentially a bit slower as it's reloading text, graphics, templates, layouts etc. Overkill for the OP's purpose as well...

RefreshList redraws the data displayed in the data grid. Potentially faster as it only refreshes the data.

RefreshLine redraws the data only for the specified line - potentially much fast if you're only changing the one line.

In real terms and especially for smaller data grids there is probably no noticeable difference between resetList and refreshList - but given that there is a speed penalty using the data grid anyway (compared to a table field for example) it makes me feel just a little bit better thinking i am eeking just a bit more speed out of the data grid

[dunbarx]

Stam.

Ah, thanks. As I am fond of saying, "I use data grids, but do not understand them".

Craig

[mrcoollion]

Tried multiple solutions like

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 dispatch "RefreshList" to group "DG_SimulatedTrades"

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 set the backgroundColor of this card to the backgroundcolor of this card // Refresh screen

It seems that the UI lockes while running a repeat loop that goes through a few thousand iterations.
To prevent this I placed the following line at the beginning of the repeat loop and that worked.

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 wait 0 with messages // To stop UI from freezing

I thought this issue did not exist anymore (as of LC 7) but it seems it still does.
It does not make the loop significantly slower so all is well now

Thanks for all the suggestions/help. Truly appreciate it.

Regards,

Paul

[stam]

Hi Paul, are you trying to refresh data in the middle of your loop?
If you are you probably shouldn’t… just run refreshList after the loop has completed and it should just refresh the data…

[mrcoollion]

Hi Paul, are you trying to refresh data in the middle of your loop?
If you are you probably shouldn’t… just run refreshList after the loop has completed and it should just refresh the data…

You Are correct, I am refreshing the data during the loop. This is necessary to show the user what is happening during the loop. With the 'wait 0 with messages' command it works fine.

Thanks