How to properly change the ribbons application button glyph image at runtime?

Hi Simon,
Thank you for the sample code, and please accept our apologies for the delay in responding.
However, from your post I don't quite understand the necessity to paint an image directly on the Glyph's Canvas. Perhaps, it is better to paint the required image on a temporary bitmap, and then assign it to the ApplicationButton.Glyph. Here is some sample code:

Delphi
procedure TForm1.BitBtn1Click(Sender: TObject);  
var  
  ABitmap: TBitmap;  
begin  
  Inc(FIndex);  
  if FIndex >= ImageList1.Count then  
    FIndex := 0;  
  ABitmap := TBitmap.Create;  
  try  
    ImageList1.GetBitmap(FIndex, ABitmap);  
    dxRibbon1.ApplicationButton.Glyph.Assign(ABitmap);  
  finally  
    FreeAndNil(ABitmap);  
  end;  
end;  

Please try this solution, and let us know how it works for you.
Thanks,
Vito

Hi Vito,
Thanks for the response.
The problem with the sample code you provided, is that it results in a non-transparent application button glyph.
There's a white 24x24 squared area behind the assigned glyph image, even when the bitmap is extracted from a tcxImageList containing alpha transparent PNG images.
When drawing directly to the application button glyph, using the tcxImageList.draw method, it works great. With alpha transparency and all. But then I get the problem with flickering, because I have to clear the glyph area before redrawing it.

Hi Simon,
When working with the TcxImageList, please use its GetImage method to retrieve a transparent image. Attached is a small sample project, illustrating this approach. Please try it, and let us know your results.
Thanks,
Vito

Vito,
I just tried the sample project and it *almost* works.
But there is a problem when assigning alpha transparent images to the application button glyph. The alpha transparent part of the resulting glyph is drawn in black.
If you can't reproduce the issue with the sample project at your computer, pls let me know and I'll send a screenshot.

Hi Simon,
Thank you for the response.
I see the problem you described, and it looks as if the solution you initially found is the best way to accomplish this task. To prevent the application button from being clicked when clearing an image, please surround your code with the DxRibbon's BeginUpdate/EndUpdate methods. The code below illustrates this approach:

Delphi
procedure TForm4.Timer1Timer(Sender: TObject);  
begin  
  Inc(FIndex);  
  if FIndex >= cxImageList1.Count then  
    FIndex := 0;  
  dxRibbon1.BeginUpdate;  
  try  
    dxRibbon1.applicationButton.glyph.canvas.brush.color := clNone;  
    dxRibbon1.applicationButton.glyph.canvas.FillRect( rect(0, 0, 24, 24) );  
    cxImageList1.Draw(dxRibbon1.ApplicationButton.Glyph.Canvas, 0, 0, FIndex, dsNormal, itImage);  
  finally  
    dxRibbon1.EndUpdate;  
  end;  
end;  

Please let us know if this helps.
Thanks,
Vito

Thanks for the response.
> surround your code with the DxRibbon's
> BeginUpdate/EndUpdate methods
Even when surrounded with beginupdate / endupdate, it flickers.