Firemonkey and large amounts of data

Question

I just had a look at Firemonkey\'s grid implementation and it turns out that it is a very simple implementation (only 1800 lines which seems not much for a grid implementati

Answer 1

The FireMonkey grid only has controls for the number of visible lines. So if you have a grid with 10 visible rows and 3 columns, it will create 30 cell controls. Filling the grid with 10.000 records is no problem: when you scroll the 30 cell controls are reused and mapped to the new visible rows.

And yes: I did some tests with this because we have TMS grids with 100.000 records :-).

If you use OnGetCellText (so not TStringgrid, which is very slow with lots of records, especially TMS grid (based in VCL stringgrid)) it is very fast (OnGetCellText only retrieves data of visible cells). We use this technique in combination with our data objects (these are already loaded, so no need to fill each cell of the grid with the string value again...) and both TMS and FMX grids are very fast with 100.000 records or more!