ImageView.hh

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#pragma once
 
#include "GtkCompat.hh"
 
#include <gtkmm/box.h>
#include <gtkmm/image.h>
#ifndef USE_GTK4
#include <gtkmm/eventbox.h>
#endif
#include <gtkmm/drawingarea.h>
#ifdef USE_GTK4
#include <gtkmm/eventcontrollermotion.h>
#endif
 
namespace cadabra {
 
    class ImageView;
    
    
    class ImageArea : public Gtk::DrawingArea {
        public:
            ImageArea(int logical_width, double display_scale);
            ImageArea(int logical_width, double display_scale,
                         const std::string& filename, bool raster);
 
            void set_image_from_base64(const std::string& b64);
            void set_image_from_svg(const std::string& svg);
 
            // Re-render the image from the raw bytes at the indicated
            // width (in logical pixels, which may be multiple display pixels).
            void rerender(int width);
            
            friend ImageView;
        protected:
            void draw(const Cairo::RefPtr<Cairo::Context>& cr, int width, int height);
#ifndef USE_GTK4
            virtual bool on_draw(const Cairo::RefPtr<Cairo::Context>& cr) override;
#endif
 
        private:
            Glib::RefPtr<Gdk::Pixbuf> pixbuf;
            
            std::string decoded; // raw byte content of image
            bool        is_raster;
            double      display_scale;
            int         logical_width;
    };
            
 
 
#ifdef USE_GTK4
    class ImageView : public Gtk::Box {
#else
    class ImageView : public Gtk::EventBox {
#endif
        public:
            ImageView(double display_scale, int logical_width);
            virtual ~ImageView();
            
            void on_save_as() const;
 
            void on_pointer_motion(double x, double y);
#ifndef USE_GTK4
            virtual bool on_motion_notify_event(GdkEventMotion *event) override;
#endif
 
            void on_button_pressed(int n_press, double x, double y);
            void on_button_released(int n_press, double x, double y);
            
            void set_image_from_base64(const std::string& b64);
            void set_image_from_svg(const std::string& svg);
 
        private:
            ImageArea area;
            
            bool      sizing;
            double    prev_x, prev_y;
            int       height_at_press, width_at_press;
 
            cdb::ContextMenu context_menu;
 
            Glib::RefPtr<cdb::ClickGesture>     click_gesture;
#ifdef USE_GTK4
            Glib::RefPtr<Gtk::EventControllerMotion> motion_controller;
#endif
    };
    
};