This bored me from some times now...

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This bored me from some times now...

Did anyone noticed how slow is TDatasetField ? Double clicking on a TDatasetField will display another DBGrid. Moving this TDataset DBGrid is slow as hell !

Is there any workaround ?

Comments

  1. Lars FosdalJuly 12, 2017 at 2:11 AM

    Which underlying DB tech? ADO, dbExpress, FireDAC - or doesn't that matter?

    ReplyDelete
  2. Stéphane WierzbickiJuly 12, 2017 at 3:11 AM

    It doesn't matter. I can reproduce it with any underlying DB.

    ReplyDelete
  3. Lars FosdalJuly 12, 2017 at 3:23 AM

    Perhaps make a small. self-contained, compilable example?

    ReplyDelete
  4. Jeroen Wiert PluimersJuly 12, 2017 at 6:29 AM

    Define slow.

    ReplyDelete
  5. Stéphane WierzbickiJuly 12, 2017 at 7:15 AM

    drive.google.com - Slow TDatafield grid moving.mp4 - Google Drive

    ReplyDelete
  6. Lars FosdalJuly 12, 2017 at 7:54 AM

    You need to work on your explanations. So, it's control redraw speed you are complaining about. That should be fairly trivial to work around.

    ReplyDelete
  7. Stéphane WierzbickiJuly 12, 2017 at 7:57 AM

    Lars Fosdal, yes I was a little bit lazy on this... I'm using Delphi's TDBGrid component. This redraw issue is their for quite a long time now. I've never debugged such things. Where should I start to look at ?

    ReplyDelete
  8. Lars FosdalJuly 12, 2017 at 8:05 AM

    Breakpoints in the rendering code may be of use to understand the reposition / redraw mechanisms. Disabling, enabling paint on mouse down + mouse move, until mouse up could be an alternative.

    ReplyDelete

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