TGColorFrame - changing background

Hello all,

I am trying to use the TGColorFrame class to show some status information. I have it inside a TGHorizontalFrame, which is inside a TGCompositeFrame, which is inside a TGMainFrame.

When I change the background color for the TGColorFrame from white to black, like this :
fColor->ChangeBackground(0); // put black color (fColor is a pointer to TGColorFrame class)
I don’t see any chage.

Do I have to call some function to make the update ?

Paulo da Silva

Hi Paulo,

I have a working macro where I am using the RGB colors (it is for having the same color on different platforms as linux, windows, mac, etc.), i.e.:

fColor->ChangeBackground(TColor::RGB2Pixel(0xFF, 0xFF, 0x00)); // yellow
fColor->ChangeBackground(TColor::RGB2Pixel(0x00, 0x00, 0x00)); // black

etc. … Could you please try this way and let me know what is the result.

Thank you, Ilka

Hi Ilka,

the problem I have is not selecting the colors. The problem is that after I issue the command the background doesn’t get updated.
I am using the program outside ROOT, compiling using Visual C++.
I wonder if there is some Update or Paint method that I should call.

Thank you,

Hi Paulo da Silva,
use gClient->NeedRedraw(frame) for frame which
you would like update/repaint.

Regards. Valeriy

Hi Paulo,

Sorry for misunderstanding - as Valeriy said you should use


Cheers, Ilka

Hello Ilka and Valeriy,

thank you all for the answers. Now it works.