+ spin_box_ = new QDoubleSpinBox(parent);
+ spin_box_->setDecimals(decimals_);
+ spin_box_->setSuffix(suffix_);
+ if (range_)
+ spin_box_->setRange(range_->first, range_->second);
+ if (step_)
+ spin_box_->setSingleStep(*step_);
+
+ update_widget();
+
+ if (auto_commit)
+ connect(spin_box_, SIGNAL(valueChanged(double)),
+ this, SLOT(on_value_changed(double)));
+
+ return spin_box_;
+}
+
+void Double::update_widget()
+{
+ if (!spin_box_)
+ return;
+
+ Glib::VariantBase variant = getter_();
+ assert(variant.gobj());
+
+ double value = Glib::VariantBase::cast_dynamic<Glib::Variant<double>>(
+ variant).get();
+ spin_box_->setValue(value);