DBGrid scroll page instead of row - delphi

Question

Well I have an issue with DBGrid vertical scrolling. When I scroll it vertically with mousewheel or vertical scrollbar it moves selected row up and down. I want to make it scroll not selected row but entire grid. Just like it works in Microsoft Excel for example (just to let you know what I mean). Any suggestions?

Answer 1

Well, almost what I'd like to see. Found the post of hanuleye on swissdelhicenter.ch. This code let's you freely scroll DBGrid with mouse wheel.
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, Grids, DBGrids, DB, DBTables;
type
TForm1 = class(TForm)
DataSource1: TDataSource;
Table1: TTable;
DBGrid1: TDBGrid;
procedure FormCreate(Sender: TObject);
procedure DBGridMouseWheel(Sender: TObject; Shift: TShiftState;
WheelDelta: Integer; MousePos: TPoint; var Handled: Boolean);
private
{ Private declarations }
public
{ Public declarations }
end;
TWheelDBGrid = class(TDBGrid)
public
property OnMouseWheel;
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
begin
TWheelDBGrid(DBGrid1).OnMouseWheel := DBGridMouseWheel;
end;
function GetNumScrollLines: Integer;
begin
SystemParametersInfo(SPI_GETWHEELSCROLLLINES, 0, #Result, 0);
end;
procedure TForm1.DBGridMouseWheel(Sender: TObject; Shift: TShiftState;
WheelDelta: Integer; MousePos: TPoint; var Handled: Boolean);
var
Direction: Shortint;
begin
Direction := 1;
if WheelDelta = 0 then
Exit
else if WheelDelta > 0 then
Direction := -1;
with TDBGrid(Sender) do
begin
if Assigned(DataSource) and Assigned(DataSource.DataSet) then
DataSource.DataSet.MoveBy(Direction * GetNumScrollLines);
Invalidate;
end;
end;
end.

Answer 2

I don't think that's possible, since to me it seems that scrollbar on DBGrids are more like a progress indicator rather than a scroll. It behaves differently from the scrolls in ListViews where you scroll "pages", in the db controls even if you move up or down a single row the scrollbar changes to reflect the "current row"/"total rows" fraction