Method pointer_type

include/xstudio/ui/mouse.hpp:343–343

    [[nodiscard]] double timestamp() const { return timestamp_; }
    [[nodiscard]] int input_type() const { return signature_.input_type_; }
    [[nodiscard]] int pointer_type() const { return signature_.pointer_type_; }

    void set_pos_in_coord_sys(const float x, const float y, const float du_dx) {
        position_in_viewport_coord_sys_.x = x;