dynamic_fl_choice.h

#ifndef _DYNAMIC_FL_CHOICE
#define _DYNAMIC_FL_CHOICE

#include <FL/Fl_Choice.H>

class Dynamic_Fl_Choice;
typedef void (Dynamic_Fl_Choice_Callback )(Dynamic_Fl_Choice*, void*);

class Dynamic_Fl_Choice : public Fl_Choice
{
public:

  Dynamic_Fl_Choice_Callback* beforePopCallback_;
  void* beforePopUserData_;

  Dynamic_Fl_Choice(int x,int y,int w,int h,const char *n = 0)
      : Fl_Choice(x,y,w,h,n),
        beforePopCallback_(NULL),
        beforePopUserData_(NULL)
  {
  }

  void BeforePopCallback(Dynamic_Fl_Choice_Callback callback, void* userData = NULL)
  {
     beforePopCallback_ = callback;     
     beforePopUserData_ = userData;
  }

  int handle(int e)
  {
     // Give the user the opertunity to modify the menu
     // before poping it up.
     if ((e == FL_PUSH ||
          e == FL_SHORTCUT) &&
         beforePopCallback_)
     {
        (beforePopCallback_)(this, beforePopUserData_);
     }
     // Call the normal handle
     return Fl_Choice::handle(e);
  }
};

#endif