+ /// Sets the current value state. If the value is changed, the signal is emitted
+ /// If the current value state is Blocked, this method do nothing
+ /// \param theState a new state
+ /// \return the previous value state
+ ValueState setValueState(const ValueState& theState);
+
+ /// Blocks the value state change.
+ /// \param theBlocked a block state
+ /// \return the previous value
+ bool blockValueState(const bool theBlocked);
+
+ /// Compute the feature default value and fill the controls with it
+ /// or store the control value to the feature
+ virtual void initializeValueByActivate();
+
+ /// Saves the internal parameters to the given feature. Emits signals before and after store
+ /// \return True in success
+ bool storeValue();
+
+ /// Saves the internal parameters to the given feature
+ /// \return True in success
+ virtual bool storeValueCustom() const = 0;
+
+ /// Restore value from attribute data to the widget's control
+ virtual bool restoreValueCustom() = 0;