150pts CustomDBGrid Component

LVL 30
thirdAsked:
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bes67Connect With a Mentor Commented:
Hi

Try this unit. This is JUST an example. PicDBGrid inherited from DBGrid and publish two properties Picture and PictureFieldName (to determine where to draw picture). Note that in the cell assotiated with this field just picture will be drawn, not the query data

unit PicDBGrid;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  Grids, DBGrids;

type
  TPicDBGrid = class(TDBGrid)
  private
    { Private declarations }
    FPicture: TPicture;
    FPictureFieldName: string;
    procedure SetPicture(Value: TPicture);
  protected
    { Protected declarations }
    procedure DrawColumnCell(const Rect: TRect; DataCol: Integer; Column: TColumn;
                             State: TGridDrawState); override;
  public
    { Public declarations }
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
  published
    { Published declarations }
    property Picture: TPicture read FPicture write SetPicture;
    property PictureFieldName: string read FPictureFieldName write FPictureFieldName;
  end;

procedure Register;

implementation

procedure Register;
begin
  RegisterComponents('Samples', [TPicDBGrid]);
end;

{ TPicDBGrid }

constructor TPicDBGrid.Create(AOwner: TComponent);
begin
  inherited;
  FPicture := TPicture.Create;
end;

destructor TPicDBGrid.Destroy;
begin
  FPicture.Free;
  inherited;
end;

procedure TPicDBGrid.DrawColumnCell(const Rect: TRect; DataCol: Integer;
  Column: TColumn; State: TGridDrawState);
begin
  inherited;
  if AnsiCompareText(Column.FieldName, PictureFieldName) = 0 then
    with Canvas do
    begin
      StretchDraw(Rect, FPicture.Bitmap);
    end;
end;

procedure TPicDBGrid.SetPicture(Value: TPicture);
begin
  FPicture.Assign(Value);
end;



end.
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thirdAuthor Commented:

Great, that did it exactly what i want! could you post your answer on the link i've given above so i can give you all the points.

btw, i have additional request. could it be possible to add a property that will control the spaces between the rows.

i have tried the code below but i'm not so sure if that's the right way to do it. it destroys the appearance of the image (i.e. not proportionally sized).

procedure TPicDBGrid.DrawColumnCell(const Rect: TRect; DataCol: Integer;
 Column: TColumn; State: TGridDrawState);
var
 OutRect : TRect;
begin
 inherited;
 if AnsiCompareText(Column.FieldName, PictureFieldName) = 0 then
   with Canvas do
   begin
     OutRect := Rect;
     InflateRect(OutRect,-2,-2);
     StretchDraw(OutRect, FPicture.Bitmap);
   end;
end;

thanks again! ;-)
0
 
bes67Commented:
I have posted on given link and ... take a look on Indent property

0
 
thirdAuthor Commented:
here's the bonus... thanks again! ;-)
0
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