DBGrid中用光標鍵控制Cell

2019-11-18 18:03:23

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{////////////////////////
//                     //
//     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;