Canvas inside a GUI - problem

ROOT
1

Hello,

I have a problem with my GUI. I have a class which derives from TGMainFrame and at one time I am creating a canvas like this:

which is not embedded in the GUI. Everything is working, the canvas is created, however when I am closing it with the cross, all my GUI is closed… I tried to disconnect the closed signal of the canvas, but I have still the same problem. I am compiling my code with a makefile, and I am using Root 5.24. Maybe I cannot create a canvas like this in a GUI…

Thank you.

Best regards,

Pierre-Louis

2

Hi Pierre-Louis,

There is no problem at all creating a TCanvas from a GUI application. The problem should be somewhere else… Is your application closing properly, or do you have any error message? Can you put a break point to see who is closing your MainFrame or your application?

Cheers, Bertrand.

3

I have no error message unfortunately… In my constructor I have these two lines, do you think the problem can come from there?

[quote]this->Connect(“TGMainFrame”, “CloseWindow()”, “TApplication”, gApplication, “Terminate()”); //To quit the application
this->DontCallClose();[/quote]

What do you mean by break point? Because I do not know if it is the canvas which is closing the application, or the application which is closed and then delete the canvas…

Pierre-Louis

4

If you want to use the CloseWindow() signal, here is the correct syntax:

Connect("CloseWindow()", "TApplication", gApplication, "Terminate()");(note the this-> is not needed…)
With your actual syntax you are connecting any TGMainframe::CloseWindow() to gApplication->Terminate()

And I meant to put a break point in your favorite debugger :wink:

Cheers, Bertrand.

5

Thank you, it works now without the “TGMainFrame”, in fact I was connecting the canvas created in this class I think.

Pierre-Louis