+ * @brief Sets the height policy of scroll indicator to have either variable or fixed height.
+ *
+ * @pre The scroll bar actor has been initialised.
+ *
+ * @param[in] policy The height policy of scroll indicator
+ */
+ void SetIndicatorHeightPolicy( IndicatorHeightPolicy policy );
+
+ /**
+ * @brief Gets the height policy of scroll indicator.
+ *
+ * @return The height policy of scroll indicator
+ */
+ IndicatorHeightPolicy GetIndicatorHeightPolicy();
+
+ /**
+ * @brief Sets the fixed height of scroll indicator.
+ * Normally the height of scroll indicator is changed dynamically according to the length of scroll content.
+ * However, when the height policy of scroll indicator is set to be fixed, the height will keep fixed
+ * regardless of the length of scroll content.
+ *
+ * @pre The scroll bar actor has been initialised.
+ *
+ * @param[in] height The fixed height of the scroll indicator
+ */
+ void SetIndicatorFixedHeight( float height );
+
+ /**
+ * @brief Gets the fix height of scroll indicator.
+ * @return The fixed height of the scroll indicator
+ */
+ float GetIndicatorFixedHeight();
+
+ /**