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Create a DBGrid that displays graphic fields (Views: 100)


Problem/Question/Abstract:

How to create a DBGrid that displays graphic fields

Answer:

unit DBPicGrd;

interface

uses
  DBGrids, DB, DBTables, Grids, WinTypes, Classes, Graphics;

type
  TDBPicGrid = class(TDBGrid)
  protected
    procedure DrawDataCell(const Rect: TRect; Field: TField; State: TGridDrawState);
      override;
  public
    constructor Create(AOwner: TComponent); override;
  published
    property DefaultDrawing default False;
  end;

procedure Register;

implementation

constructor TDBPicGrid.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  DefaultDrawing := False;
end;

procedure TDBPicGrid.DrawDataCell(const Rect: TRect; Field: TField; State:
  TGridDrawState);
var
  bmp: TBitmap;
begin
  with Canvas do
  begin
    FillRect(Rect);
    if Field is TGraphicField then
    try
      bmp := TBitmap.Create;
      bmp.Assign(Field);
      Draw(Rect.Left, Rect.Top, bmp);
    finally
      bmp.Free;
    end
    else
      TextOut(Rect.Left, Rect.Top, Field.Text);
  end;
end;

procedure Register;
begin
  RegisterComponents('Custom', [TDBPicGrid]);
end;

end.

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