Gtk4DrawArea.h

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// Author: Sergey Linev, GSI   12/08/2026
 
/*************************************************************************
 * Copyright (C) 1995-2026, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT_Gtk4DrawArea_H
#define ROOT_Gtk4DrawArea_H
 
#include <gtkmm.h>
#include <cairomm/context.h>
 
class TCanvas;
 
class Gtk4DrawArea : public Gtk::DrawingArea {
public:
    Gtk4DrawArea();
    virtual ~Gtk4DrawArea() = default;
 
    void SetCanvas(TCanvas *c) { fCanvas = c; }
    TCanvas *GetCanvas() const { return fCanvas; }
 
    Cairo::Context *GetContext() const { return fContext; }
 
    Cairo::ImageSurface *GetCache() const { return fDrawingCache.get(); }
 
    void ShowContextMenu(Glib::RefPtr<Gio::Menu> menu_model, const char *title, int x, int y);
 
    sigc::signal<void(const char *)> status_changed();
 
 
 
protected:
    // The render function for gtkmm 4
    void on_draw(const Cairo::RefPtr<Cairo::Context>& cr, int width, int height);
 
    TCanvas *fCanvas = nullptr;
    Cairo::Context *fContext = nullptr;
    double fLastMouseX = 0;
    double fLastMouseY = 0;
    bool fShowEventStatus = true;
    Cairo::RefPtr<Cairo::ImageSurface> fDrawingCache;
 
    void on_mouse_click(int n_press, double x, double y);
    void on_mouse_released(int n_press, double x, double y);
    void on_mouse_enter(double x, double y);
    void on_mouse_move(double x, double y);
    void on_mouse_leave();
    bool on_mouse_scroll(double dx, double dy);
    bool on_my_query_tooltip(int x, int y, bool keyboard_tooltip, const Glib::RefPtr<Gtk::Tooltip>& tooltip);
 
    sigc::signal<void(const char *)> m_status_changed;
 
    Glib::RefPtr<Gtk::GestureClick> m_click_gesture;
    Glib::RefPtr<Gtk::EventControllerMotion> m_motion_controller;
    Glib::RefPtr<Gtk::EventControllerScroll> m_scroll_controller;
};
 
#endif