AbstractWidgetGroup.h

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#pragma once
 
#include <initializer_list>
#include <vector>
 
 
template<class This, class Widget> class AbstractWidgetGroup {
protected:
    std::vector<Widget *> _children;
 
public:
    typedef std::initializer_list<Widget *> List;
 
    virtual This *Add(Widget *w)
    {
        _children.push_back(w);
        return (This *)this;
    }
    This *AddM(const List &list)
    {
        for (const auto &w : list) Add(w);
        return (This *)this;
    }
};
 
 
template<class This, class Widget, class That> class WidgetGroupWrapper : public AbstractWidgetGroup<This, Widget> {
protected:
    That *_group;
 
public:
    WidgetGroupWrapper(That *group) : _group(group) {}
 
    virtual This *Add(Widget *w) override
    {
        _group->Add(w);
        return AbstractWidgetGroup<This, Widget>::Add(w);
    }
};