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Image on a TcustomPanel

Posted on 2003-12-12
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Last Modified: 2010-04-05
Hi

I want to write a desktop component, which works as the windows desktop.
It's inherit from TCustomPanel that contain a Timage. This Image is the background.
The background is showing in design-time, but I cannot see it in run time.
Can you help me ? Can I write something in the Paint methode ?
Here is the code.

...
    FBkGround : TPicture;
    FImage : TImage;
...

constructor Tdesktop.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  Self.DoubleBuffered:=True;
  if FBkGround=nil then FBkGround:=TPicture.Create;
  Fimage:=TImage.Create(Self);
  Fimage.Align:=alClient;
  Fimage.Stretch:=true;  
  FImage.Picture:=FBkGround;
  Fimage.Parent:=Self;
end;

procedure Tdesktop.SetBkGround(Value: TPicture);
begin
  FBkGround.Assign(Value);
  Fimage.Picture:=FBkGround;
end;
0
Comment
Question by:wwwbetyar
  • 3
  • 2
6 Comments
 
LVL 26

Expert Comment

by:Russell Libby
ID: 9928638

Have you tried setting the Visible property for the FImage? (sorry, can't test at the moment).

Regards,
Russell

constructor Tdesktop.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  Self.DoubleBuffered:=True;
  if FBkGround=nil then FBkGround:=TPicture.Create;
  Fimage:=TImage.Create(Self);
  Fimage.Align:=alClient;
  Fimage.Stretch:=true;  
  FImage.Picture:=FBkGround;
  Fimage.Parent:=Self;

  Fimage.Visible:=True; // <---

end;
0
 

Author Comment

by:wwwbetyar
ID: 9928751
It doesn't work.
0
 

Author Comment

by:wwwbetyar
ID: 9928778
I wrote a procedure

procedure Tdesktop.Start;
begin
  Fimage.Picture:=FBkGround;
end;

If I call this procedure from the code (not in the components) it works.
But I don't want to call any procedure to work...
Does it have any triks for aftershow ?
Or any good solve ?
0
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LVL 5

Accepted Solution

by:
delphized earned 100 total points
ID: 9936881
in your original code

 instead of  FImage.Picture:=FBkGround;
use:
 FImage.Picture.assign(FBkGround);

and I wouldn't use the separate tpicure variable FBkGround, use instead the FImage.picture property
 

0
 

Author Comment

by:wwwbetyar
ID: 9937146
Your solution, does not work, but here is a good :

constructor Tdesktop.Create(AOwner: TComponent);
begin
...
  FDrawing:=True;
...
End;

procedure Tdesktop.Paint;
begin
  inherited;
  If (FBkGround<>nil) and (FDrawing) then
  Begin
    FDrawing:=False;
    Fimage.Picture.Assign(FBkGround);
  End;
end;
0
 
LVL 5

Expert Comment

by:delphized
ID: 9938655
yes, the point is the assign statement as I told you.
You can't use := to copy an image
the fact that you don't want to repaint the picture is not mentioned in this question
0

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