TStringGrid dynamic number of checkbox columns
lazarus / 31-LCL

----------------------------------------------------------------------
_N_ · 2021-02-28 18:02

Hello all.
I need to create a grid with many checkboxes. To solve the problem I
decided to use TStringGrid component as it has ability to have a
column of checkboxes. But to be able to set a column of a string grid
as column with checkboxes, it is required to set ButtonStyle property
of the column to cbsCheckboxColumn and seems that this is possible
only via Columns field of the string grid (so I cannot just set
Row/ColCount property, because it doesn't work with/update Columns
field).
Everything works fine when I add certain number of columns manually
using form editor, but the problem is that I need to add the columns
in a loop at runtime. And here I don't know (and failed to find any
info on this) how to manually create a grid column that supports
ButtonStyle property with cbsCheckboxColumn value. So, at runtime i
have empty AStringGrid.Columns and I want to add an item there, but
have no idea of which class it should be and how to add it there
correctly. Will the following construction be correct and what
descendant of TGridColumn I should use?
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
AStringGrid.Columns.Add(SomeTGridColumnDescendant.Create(...));Thank
you in advance.

----------------------------------------------------------------------
jamie · 2021-02-28 18:46

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
TForm1.Button1Click(Sender: TObject);Var  C:TGridColumn;begin  C:=
StringGrid1.Columns.Add;  C.ButtonStyle:=cbsCheckboxColumn;end;      
                                              
Did you time me ?

----------------------------------------------------------------------
_N_ · 2021-02-28 19:05

Thank you very much!

----------------------------------------------------------------------
jamie · 2021-02-28 20:24

and btw, I could of done it this way too...
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
StringGrid1.Columns.Add.ButtonStyle:=cbsCheckboxColumn;

----------------------------------------------------------------------
speter · 2021-02-28 22:40

You could also look at the TCheckGroup component; it might be simpler.

cheers
S.