/homes/esi30/DCS339/coursework/src/display_page.hpp

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#ifndef DISPLAY_PAGE_HPP_INCLUDED
#define DISPLAY_PAGE_HPP_INCLUDED

#include <memory>
#include <string>
#include <type_traits>

#include <gtkmm/box.h>
#include <gtkmm/button.h>
#include <gtkmm/enums.h>
#include <gtkmm/image.h>
#include <gtkmm/label.h>
#include <gtkmm/paned.h>
#include <gtkmm/scrolledwindow.h>
#include <gtkmm/widget.h>

#include "display_unit.hpp"

class Display_catalogue;
class Processing_unit;

class Display_page: public Gtk::HPaned {
    public:
        Display_page();

        template<class T>
        Display_page(std::shared_ptr<T> p);

        void undo();
        void redo();
        bool save();
        void save_as(const std::string&);

        friend void swap(Display_page &lhs, Display_page &rhs) noexcept;

        bool on_button_press_event(GdkEventButton*);

        std::tuple<int,int,int,int> selection() const;

    private:
        std::shared_ptr<Display_unit> display_unit; 
        Gtk::ScrolledWindow c1, c2;
        int s_y1, s_x1, s_y2, s_x2;

        void detach_child();
        void attach_child();
    
        friend class Processing_unit;
        friend class Display_catalogue;
};

class Display_page_header: public Gtk::HBox {
    public:
        Display_page_header(const std::string &text);

        void assign(Display_catalogue *father, unsigned id);

    private:
        Gtk::Label title; 
        Gtk::Image close_img; 
        Gtk::Button close; 
        Display_catalogue *father; 
        unsigned id; 
        void on_close();

        friend class Display_catalogue;
};


template<class T>
Display_page::Display_page(std::shared_ptr<T> p): display_unit(p) {
    static_assert(std::is_base_of<Gtk::Widget, T>::value, "Trying to construct a Display_page from a type without Gtk::Widget as base class");
    static_assert(std::is_base_of<Display_unit, T>::value, "Trying to construct a Display_page from a type without Display_unit as base class");

    add2(c2);
    c2.add(*p);
    if(Gtk::Widget *father_widget=reinterpret_cast<Gtk::Widget*>(p->father.get())){
        add1(c1);
        c1.add(*father_widget);
    }

    set_position(get_allocated_width()/2);
    show_all_children();

    c1.set_policy(Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);
    c2.set_policy(Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);
}

#endif