I have created a widget that overrides handle(int). Inside handle, I want to
process various events depending on whether a callback for the widget has
been set.
For example,
int Fl_MyWidget::handle(int e)
{
switch(e)
{
case FL_PUSH:
if(callback())
{
fl_cursor(FL_CURSOR_HAND);
return 1;
}
break;
// other cases ...
}
}
Then the app, assigns or removes the callback I defined as needed.
My problem is that when I create Fl_MyWidget, its callback is automagically
set to Fl::default_callback(). My questions are:
1. What is the purpose of this callback?
2. Is it safe to set the callback for Fl_MyWidget (in the ctor) to NULL? 3.
3. Also, the docs say that I _may_ want to use this default callback? If
so, for what purpose/what could I do with it?
Thanks.
--
Alvin
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