How to determine value of DbGrid cell during OnMouseMove event - database

Question

I have OnMouseMove event, during which I want to find a value of certain cell (not neccesarily the one under the mouse). Basically the question is:
How to access cell data using its x and y coordinates without selecting it, changing focus etc?

Answer 1

Tofig, you can use the MouseCoord procedure to get the current row and col, but to show the value of the pos [Col,Row] you must set the DataLink.ActiveRecord property to the Row value and create a new class descendent to access the protected property.
check this code
type
THackGrid = class(TCustomDBGrid); //Create a new class to access the protected properties
procedure TForm1.DBGrid1MouseMove(Sender: TObject; Shift: TShiftState; X,
Y: Integer);
var
Cell : TGridCoord;
Row,Col : integer;
OrigActiveRecord : integer;
begin
inherited;
Cell:=DBGrid1.MouseCoord(X,Y);
Col:= Cell.X;
Row:= Cell.Y;
if dgTitles in DBGrid1.Options then Dec(Row); //if the titles are shown then adjust Row index (-1);
if dgIndicator in DBGrid1.Options then Dec(Col); //if the indicator is shown then adjust the Column index (-1);
if THackGrid(DBGrid1).DataLink.Active and (Row>=0) and (Col>=0) then
begin
OrigActiveRecord:=THackGrid(DBGrid1).DataLink.ActiveRecord; //save the original index
try
THackGrid(DBGrid1).DataLink.ActiveRecord:= Row;
Label1.Caption:=DBGrid1.Columns[Col].Field.AsString; //show the current value in a tlabel
finally
THackGrid(DBGrid1).DataLink.ActiveRecord:= OrigActiveRecord; //restore the index
end;
end;
end;