class Widget_Distance : public Gtk::SpinButton
{
//sigc::signal<void> signal_value_changed_;
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mutable synfig::Distance distance_;
Gtk::Adjustment adjustment;
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protected:
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int on_input(double* new_value);
bool on_output();
public:
//sigc::signal<void> &signal_value_changed() { return signal_value_changed_; }
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void set_value(const synfig::Distance &data);
synfig::Distance get_value()const;
Widget_Distance();