Class: TEgFireGrid
property OnSortChange: TEgFireGridSortChangeEvent;
TEgFireGridSortChangeEvent = procedure(Sender: TObject; Column: TEgFireGridColumn;
Direction: TEgFireGridSortDirection) of object;Occurs when a click on a title has changed the sort direction of its
column; Column is that column and Direction is
the new direction. The grid does not sort: the handler applies the order
to the dataset, for example with FireDAC’s IndexFieldNames
or a new query.
A click on a title fires OnTitleClick,
then changes the sort, then fires this event. Only one column is sorted
at a time: the others go back to fgsNone. What the click
does depends on the column’s Sortable:
with fscBoth (the default) it alternates between ascending
and descending; with fscAscending or
fscDescending it alternates between that direction and
none; with fscNone it changes nothing and this event does
not occur. A click on a title’s icon never sorts.
procedure TForm1.Grid1SortChange(Sender: TObject; Column: TEgFireGridColumn; Direction: TEgFireGridSortDirection);
begin
case Direction of
fgsAscending: Query1.IndexFieldNames := Column.FieldName;
fgsDescending: Query1.IndexFieldNames := Column.FieldName + ':D';
else
Query1.IndexFieldNames := '';
end;
end;The grid’s handler runs first, then the column’s own event of the same name.