DBGrid中用光标键控制Cell

{////////////////////////
// //
// Grids549 //
// //
// 14:33 2005-2-17 //
// //
}////////////////////////
unit Grids549;

interface

uses
DBGrids, Classes, Windows;

type
TDBGrid549 = class(TDBGrid)
public
property InPlaceEditor;
end ;

procedure CursorCtrl(Sender: TObject; var Key: Word; Shift: TShiftState);

implementation

{ TDBGrid549 }

procedure CursorCtrl(Sender: TObject; var Key: Word;
Shift: TShiftState);
{
Warn: This procedure may change VK_RIGHT and VK_LEFT to 0

Call this in DBGridKeyDown procedrue
eg:
procedure TForm1.DBGrid1KeyDown(Sender: TObject; var Key: Word;
Shift: TShiftState);
begin
Grids549.CursorCtrl(Sender, Key, Shift);
end;
}
var
GridEditorMode: Boolean;
begin
if Shift <> [] then Exit;
if (Key <> VK_RIGHT) and (Key <> VK_LEFT) then
Exit;
GridEditorMode := TDBGrid(Sender).EditorMode;
if not GridEditorMode then
TDBGrid(Sender).EditorMode := True;

if Key = VK_RIGHT then begin
if GridEditorMode and (TDBGrid549(Sender).InplaceEditor.SelStart <>
Length(TDBGrid549(Sender).InplaceEditor.Text)) then begin
Exit;
end;
//Last field, move to next record
if TDBGrid(Sender).SelectedIndex =
TDBGrid(Sender).FieldCount - 1 then begin
TDBGrid(Sender).DataSource.DataSet.Next;
TDBGrid(Sender).SelectedIndex := 0;
end
else
//Focus on next field
if TDBGrid(Sender).EditorMode then begin
TDBGrid(Sender).SelectedIndex := TDBGrid(Sender).SelectedIndex 1;
end;
end
else
if Key = VK_LEFT then begin
if GridEditorMode and(TDBGrid549(Sender).InplaceEditor.SelStart <> 0) then
Exit;
//First field, move to prior record
if TDBGrid(Sender).SelectedIndex = 0 then begin
TDBGrid(Sender).DataSource.DataSet.Prior;
TDBGrid(Sender).SelectedIndex := TDBGrid(Sender).FieldCount - 1;
end
else
//Focus on prior field
if TDBGrid(Sender).EditorMode then begin
TDBGrid(Sender).SelectedIndex := TDBGrid(Sender).SelectedIndex - 1;
end;
end;
Key := 0;
end;

end.

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