Re: [gtk-list] help w/ gtk_timeout_add

[Ionutz Borcoman <borco borco-ei eng hokudai ac jp>]

"Kurt V. Hindenburg" wrote:
> 
> // long...
> 
> Hello all,
> 
>  I'm having troubles using gtk_timeout_add in C++ (VDK variety).  I
> have a program in C that runs fine using gtk_timeout_add.
> However, in C++/VDK I get some warnings I'm confused about and
> when the program runs it eats up all the CPU and is very sluggish.
> I'm fairly sure the problem is gtk_timeout_add cause I'm using
> canvaswin.cc (VDK) as example code.
> I'm not an expert at C++, so perhaps it's just a C++ thing.
> 
>  First off, are there any example of using gtk_timeout_add in C++?
> 
> Here's my attempt:
> 
> timerId = gtk_timeout_add ( 10 , AntWin::timeout_fn,this);
> 
> The warning I get is:
> antwin.cc:90: warning: converting from `gint (AntWin::*)(void *)'
> to `gint (*)(void *)'

In general, you'll have to declare your functions as static if you want
to use them with the gtk signaling system. 

But better use a VDKTimer and connect your function with:

DEFINE_SIGNAL_MAP(MyForm,VDKForm)
  ON_SIGNAL( _timer, timer_tick_signal, OnTimerTick)
  END_SIGNAL_MAP;

bool
MyForm::OnTimerTick(VDKObject *)
{
	...;
	return true; 
}

About the problem of programs being slow with gtk_timeout_add: try to
increase the timer tick. I think the program will eat all your CPU if
you get too many timer events. 

Other problem with idle and timer stuff can come from the fact that VDK
uses the idle to do garbage collection. Maybe this can be improved, but
Mario is the one who can tell you more. Mario ?

Ionutz
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