On 05/23/12 10:29, David Currie wrote:
> MyTextWindow(int W, int H,const char* l)
> : Fl_Window(W,H,l), MyTextDisplay(20,20,W-40,H-40,NULL)
> {
> Fl_Window::label(l);
> Fl_Window::add(this); // Compile error : ambiguous base class Fl_Widget
Don't even do the add(); it's not needed. (**)
FWIW, I wouldn't use multiple inheritance anyway, I'd just derive
from Fl_Window, and make MyTextDisplay a protected/private member,
and provide methods to manipulate the member separately, or provide
a single method that lets app code access it directly. That's the
common technique in FLTK apps, and is indeed how FLTK implements its
own derived widgets.
** add() is implied because Fl_Window::begin() is implied,
which handles add()ing all widgets that follow automatically
until an end().
So for instance, the following code:
Fl_Window win(..);
MyTextDisplay myt(..);
win.end();
..really ends up being:
Fl_Window win(..);
win.begin(); // THIS IS IMPLIED
MyTextDisplay myt(..); // automatically a child of the win due to
implied win.begin()
win.end(); // end() the auto-parenting behavior of the
Fl_Window
..
..which by definition does an add() already, so including an add()
after the MyTextDisplay declaration is redundant.
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