[Lazarus] Increasingly frustrated with DbGrids
luca at wetron.es
Mon Nov 2 11:12:08 CET 2015
I constantly stumble with the behaviour of the TDBGrid.
I understand that it's a complex component, but every time I find an
issue an Luiz fixes it, two more pop up (or an older one resurfaces).
The latest episode of the saga is the futility of using a custom editor
(with OnSelectEditor), since the grids then sets the value of the field
using this snippet of code
if (FEditor<>nil) and FEditor.Visible then begin
SetEditText(Msg.Col, Msg.Row, Msg.Value);
and this only works with the editors defined in Grids.pas, the only ones
managing the GM_GETVALUE message.
For other kinds of editors the result depends on how you move in the
grid: it could either maintain the value the editor set or reset it to
an empty string.
I think I will file a bug once I can create a simple project, but in the
meantime if somebody has an idea on how to solve it, it would be
Oh, and a custom editor has no way of adapting if the dbgrid is
scrolled, a column is resized, etc. Again, this only work for the
editors defined in Grids.pas.
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