Re: TPad::WaitPrimitive comments

Maxim,

-Could you indicate what type of problems you faced? -What is the problem that you are trying to solve?

What you show is certainly not a solution to any problem. If you just want to interact with the window while filling the histograms
simply call gSystem->ProcessEvents();

Rene Brun

On Mon, 24 Apr
2006,
Maxim Nikulin wrote:

> Hi,
>
> I faced several problems during my attempts to use the TPad::WaitPrimitive()
> method and I think these issues should be mentioned in the documentation.
> I've written a script demonstrating a possible solution, I hope it will be
> useful for someone.
>
> {
> h = new TH1F ("h", "h", 10, 0, 1);
> h->Draw();
> t = new TText(0.5, 0.5, "Text");
> t->SetName("t"); // otherwise it has empty name ""
> // and WaitPrimitive() returns immediately
> // TText is not the only class having the empty
> // name by default
> t->Draw();
> for (Int_t i = 0; i < 10; ++i)
> {
> h->Fill(i/10. + 0.01);
> c1->Modified();
> c1->Update();
> c1->WaitPrimitive();
> c1->HandleInput(kNoEvent, 0, 0); // next call of WaitPrimitive()
> // often receives the same event
> // so no pause happens
> cout << i << endl;
> }
> }
>
> Another point is that the canvas can be closed while WaitPrimitive() is
> executed. Probably the code should handle this case.
>
> I don't think input event processing significantly varies for different
> window managers, but just to be precise. I use Black box window manager, ROOT
> 5.10/00 and Fedora Core 2 on a Pentium 4 box.
>
>
Received on Mon Apr 24 2006 - 08:19:07 MEST