// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Ruler widget. Indicates horizontal or vertical position of a cursor in a specified widget.
 *
 * Copyright (C) 2019 Tavmjong Bah
 *
 * The contents of this file may be used under the GNU General Public License Version 2 or later.
 *
 */

#ifndef INK_RULER_H
#define INK_RULER_H

/* Rewrite of the C Ruler. */

#include <gtkmm.h>

namespace Inkscape {
namespace Util {
class Unit;
}
}

namespace Inkscape {
namespace UI {
namespace Widget {
  
class Ruler : public Gtk::DrawingArea
{
public:
    Ruler(Gtk::Orientation orientation);

    void set_unit(Inkscape::Util::Unit const *unit);
    void set_range(const double& lower, const double& upper);

    void add_track_widget(Gtk::Widget& widget);
    bool draw_marker_callback(GdkEventMotion* motion_event);

    void size_request(Gtk::Requisition& requisition) const;
    void get_preferred_width_vfunc( int& minimum_width,  int& natural_width ) const override;
    void get_preferred_height_vfunc(int& minimum_height, int& natural_height) const override;

protected:
    bool draw_scale(const Cairo::RefPtr<::Cairo::Context>& cr);
    void draw_marker(const Cairo::RefPtr<::Cairo::Context>& cr);
    Cairo::RectangleInt marker_rect();
    bool on_draw(const::Cairo::RefPtr<::Cairo::Context>& cr) override;
    void on_style_updated() override;

private:
    Gtk::Orientation    _orientation;

    Inkscape::Util::Unit const* _unit;
    double _lower;
    double _upper;
    double _position;
    double _max_size;
    double _font_scale;

    bool   _backing_store_valid;

    Cairo::RefPtr<::Cairo::Surface> _backing_store;
    Cairo::RectangleInt _rect;
};

} // Namespace Inkscape
}
}
#endif // INK_RULER_H

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
