TizenRefApp-9738 [Call UI] Reimplement ATSPI highlight custom logic using AoSequencer

Change-Id: Id7995c9e9df2173a3e7535e381dd08f3fd0aa682

11 files changed, 324 insertions, 589 deletions

diff --git a/call-ui/presenters/misc/AccessoryPresenter.cpp b/call-ui/presenters/misc/AccessoryPresenter.cpp
index dcee9e5..66f68fa 100644
--- a/call-ui/presenters/misc/AccessoryPresenter.cpp
+++ b/call-ui/presenters/misc/AccessoryPresenter.cpp
@@ -18,6 +18,8 @@
 
 #include "ucl/appfw/types.h"
 
+#include "call-ui/view/AoSequencer.h"
+
 #include "call-ui/resources.h"
 
 #include "call-ui/presenters/common.h"
@@ -124,6 +126,14 @@ namespace callui {
 	}
 
 	AccessoryPresenter::Builder &
+	AccessoryPresenter::Builder::setAoRequestHandler(
+			AoRequestHandler handler)
+	{
+		m_aoRequestHandler = std::move(handler);
+		return *this;
+	}
+
+	AccessoryPresenter::Builder &
 	AccessoryPresenter::Builder::setParentWidget(ElmWidgetSRef parentWidget)
 	{
 		m_parentWidget = std::move(parentWidget);
@@ -133,23 +143,27 @@ namespace callui {
 	AccessoryPresenterSRef
 	AccessoryPresenter::Builder::build(GuiPresenter &parent) const
 	{
-		if (!m_sm || !m_cm || !m_parentWidget) {
+		if (!m_sm || !m_cm || !m_parentWidget || !m_aoRequestHandler) {
 			LOG_RETURN_VALUE(RES_FAIL, {}, "Main params are not set");
 		}
 
-		auto result = makeShared<AccessoryPresenter>(m_sm, m_exitHandler);
-		FAIL_RETURN_VALUE(result->prepare(parent, *m_parentWidget, m_cm), {},
-				"result->prepare() failed!");
+		auto result = makeShared<AccessoryPresenter>(m_sm,
+				m_exitHandler,
+				m_aoRequestHandler);
+		FAIL_RETURN_VALUE(result->prepare(parent, *m_parentWidget, m_cm),
+				{}, "result->prepare() failed!");
 
 		return result;
 	}
 
 	AccessoryPresenter::AccessoryPresenter(IRefCountObj &rc,
 			ISoundManagerSRef sm,
-			NotiHandler handler):
+			NotiHandler exitHandler,
+			AoRequestHandler aoReqHandler):
 		GuiPresenter(rc),
 		m_sm(std::move(sm)),
-		m_exitHandler(std::move(handler)),
+		m_exitHandler(std::move(exitHandler)),
+		m_aoRequestHandler(std::move(aoReqHandler)),
 		m_vcTimer(nullptr),
 		m_audioState(m_sm->getAudioState()),
 		m_mode(CallMode::UNDEFINED),
@@ -171,13 +185,12 @@ namespace callui {
 
 		FAIL_RETURN(createWidget(parentWidget),
 				"createWidget() failed!");
-
 		FAIL_RETURN(createSlider(),
 				"createSlider() failed!");
-
 		FAIL_RETURN(createVolumeControl(),
 				"createVolumeControl() failed!");
-
+		FAIL_RETURN(createAtspiHighlightHelper(),
+				"createAtspiHighlightHelper() failed!");
 
 		updateCurrentVolume();
 
@@ -233,11 +246,17 @@ namespace callui {
 		switch (m_mode) {
 		case CallMode::OUTGOING:
 		case CallMode::DURING:
-			return setActiveCallCompomnents();
+			FAIL_RETURN(setActiveCallCompomnents(),
+					"setActiveCallCompomnents() failed!");
+			registerActiveCallAoCompomnents();
+			break;
 		case CallMode::END:
-			return setEndCallCompomnents(cm);
+			FAIL_RETURN(setEndCallCompomnents(cm),
+					"setEndCallCompomnents() failed!");
+			registerEndCallAoCompomnents();
+			break;
 		default:
-			return RES_OK;
+			break;
 		}
 		return RES_OK;
 	}
@@ -299,6 +318,11 @@ namespace callui {
 		hide(*m_vc);
 	}
 
+	bool AccessoryPresenter::getVolumeControlsVisibility()
+	{
+		return m_vc->isVisible();
+	}
+
 	Result AccessoryPresenter::createWidget(ElmWidget &parent)
 	{
 		m_widget = Layout::Builder().
@@ -308,6 +332,8 @@ namespace callui {
 			LOG_RETURN(RES_FAIL, "Layout::build() failed!");
 		}
 
+		setDeactivatorSink(m_widget);
+
 		return RES_OK;
 	}
 
@@ -346,7 +372,11 @@ namespace callui {
 		m_vc->resize(w, h);
 		hide(*m_vc);
 
-		registerVolumeControlAo();
+		m_vc->getDecreaseBtn().addEventHandler(ATSPI_HIGHLIGHTED,
+				WEAK_DELEGATE_THIS(onVolumeControlScreenReaderReadStart));
+
+		m_vc->getIncreaseBtn().addEventHandler(ATSPI_HIGHLIGHTED,
+				WEAK_DELEGATE_THIS(onVolumeControlScreenReaderReadStart));
 
 		return RES_OK;
 	}
@@ -479,7 +509,8 @@ namespace callui {
 		}
 	}
 
-	void AccessoryPresenter::onAddContactBtnClicked(Widget &widget, void *eventInfo)
+	void AccessoryPresenter::onAddContactBtnClicked(Widget &widget,
+			void *eventInfo)
 	{
 		Result res = impl::launchAddContact(m_unsavedPhoneNumber);
 		if (res != RES_OK) {
@@ -724,67 +755,106 @@ namespace callui {
 				m_muteBtn->emit(impl::SIGNAL_TURN_OFF);
 	}
 
-	ElmWidget *AccessoryPresenter::getVolumBtn()
+	void AccessoryPresenter::onVolumeControlScreenReaderReadStart(
+			Widget &widget,
+			void *eventInfo)
 	{
-		return m_volumeBtn.get();
+		restartVCTimer();
 	}
 
-	ElmWidget *AccessoryPresenter::getBluetoothBtn()
+	Result AccessoryPresenter::createAtspiHighlightHelper()
 	{
-		return m_bluetoothBtn.get();
-	}
+		m_atspiHelper = AtspiHighlightHelper::newInstance(*this);
+		if (!m_atspiHelper) {
+			LOG_RETURN(RES_FAIL,
+					"AtspiHighlightHelper::newInstance() failed!");
+		}
 
-	ElmWidget *AccessoryPresenter::getMuteBtn()
-	{
-		return m_muteBtn.get();
-	}
+		m_atspiHelper->setEventHandler(
+				WEAK_DELEGATE_THIS(onAtspiHighlight));
 
-	ElmWidget *AccessoryPresenter::getAddContactBtn()
-	{
-		return m_addContactBtn.get();
+		return RES_OK;
 	}
 
-	ElmWidget *AccessoryPresenter::getVolumeControlLy()
+	const Elm_Interface_Atspi_Accessible *AccessoryPresenter::onAtspiHighlight(
+			const Elm_Interface_Atspi_Accessible *ao,
+			Elm_Atspi_Relation_Type flowRelation)
 	{
-		return m_vc.get();
-	}
+		AoSequencer seq(ao, flowRelation);
 
-	ElmWidget *AccessoryPresenter::getVolumeControlDecreaseBtn()
-	{
-		return m_vc->getDecreaseBtn();
+		switch (m_mode) {
+		case CallMode::OUTGOING:
+		case CallMode::DURING:
+			if (m_vc->isVisible()) {
+				return seq.process(m_vc).
+						process(m_vc->getDecreaseBtn()).
+						process(m_vc->getValueTxtAo()).
+						process(m_vc->getIncreaseBtn()).
+						getNext();
+			} else {
+				return seq.process(requestNextAo(false)).
+						process(m_volumeBtn).
+						process(m_bluetoothBtn).
+						process(m_muteBtn).
+						process(requestNextAo(true)).
+						getNext();
+			}
+		case CallMode::END:
+			return seq.process(requestNextAo(false)).
+					process(m_addContactBtn).
+					process(requestNextAo(true)).
+					getNext();
+		default:
+			break;
+		}
+
+		return nullptr;
 	}
 
-	ElmWidget *AccessoryPresenter::getVolumeControlIncreaseBtn()
+	void AccessoryPresenter::registerActiveCallAoCompomnents()
 	{
-		return m_vc->getIncreaseBtn();
+		m_atspiHelper->registerObject(*m_volumeBtn);
+		m_atspiHelper->registerObject(*m_bluetoothBtn);
+		m_atspiHelper->registerObject(*m_muteBtn);
+
+		m_atspiHelper->registerObject(*m_vc);
+		m_atspiHelper->registerObject(m_vc->getDecreaseBtn());
+		m_atspiHelper->registerObject(m_vc->getIncreaseBtn());
+		m_atspiHelper->registerObject(m_vc->getValueTxtAo());
 	}
 
-	ElmWidget *AccessoryPresenter::getVolumeControlValueTxtAo()
+	void AccessoryPresenter::registerEndCallAoCompomnents()
 	{
-		return m_vc->getValueTxtAo();
+		m_atspiHelper->registerObject(*m_addContactBtn);
 	}
 
-	void AccessoryPresenter::registerVolumeControlAo()
+	Elm_Interface_Atspi_Accessible *AccessoryPresenter::requestNextAo(
+			bool isFlowsTo)
 	{
-		auto decrBtn = m_vc->getDecreaseBtn();
-		if (decrBtn) {
-			decrBtn->addEventHandler(ATSPI_HIGHLIGHTED,
-					WEAK_DELEGATE_THIS(onVolumeControlScreenReaderReadStart));
-		}
-
-		auto incrBtn = m_vc->getIncreaseBtn();
-		if (incrBtn) {
-			incrBtn->addEventHandler(ATSPI_HIGHLIGHTED,
-					WEAK_DELEGATE_THIS(onVolumeControlScreenReaderReadStart));
+		if (const auto handler = m_aoRequestHandler.lock()) {
+			return handler(isFlowsTo);
 		}
+		return nullptr;
 	}
 
-	void AccessoryPresenter::onVolumeControlScreenReaderReadStart(
-			Widget &widget,
-			void *eventInfo)
+	Elm_Interface_Atspi_Accessible *AccessoryPresenter::getNextAo(
+			bool isFlowsTo)
 	{
-		restartVCTimer();
+		switch (m_mode) {
+		case CallMode::OUTGOING:
+		case CallMode::DURING:
+			if (m_vc->isVisible()) {
+				return as_ao(m_vc);
+			} else {
+				return isFlowsTo ? as_ao(m_volumeBtn) : as_ao(m_muteBtn);
+			}
+			break;
+		case CallMode::END:
+			return as_ao(m_addContactBtn);
+			break;
+		default:
+			break;
+		}
+		return nullptr;
 	}
-
 }
-
diff --git a/call-ui/presenters/misc/AccessoryPresenter.h b/call-ui/presenters/misc/AccessoryPresenter.h
index 0b8b5b3..86d1cb6 100644
--- a/call-ui/presenters/misc/AccessoryPresenter.h
+++ b/call-ui/presenters/misc/AccessoryPresenter.h
@@ -30,6 +30,8 @@
 #include "call-ui/view/VolumeControl.h"
 #include "call-ui/view/Slider.h"
 
+#include "call-ui/presenters/misc/AtspiHighlightHelper.h"
+
 #include "call-ui/presenters/types.h"
 
 namespace callui {
@@ -76,6 +78,13 @@ namespace callui {
 			Builder &setRequestExitHandler(NotiHandler handler);
 
 			/**
+			 * @brief Sets access object request handler
+			 * @param[in] handler Access object request handler
+			 * @return Reference to builder
+			 */
+			Builder &setAoRequestHandler(AoRequestHandler handler);
+
+			/**
 			 * @brief Sets parent widget for UI components creation
 			 * @param[in] parentWidget Parent widget
 			 * @return Reference to builder
@@ -95,6 +104,7 @@ namespace callui {
 			ICallManagerSRef m_cm;
 			ucl::ElmWidgetSRef m_parentWidget;
 			NotiHandler m_exitHandler;
+			AoRequestHandler m_aoRequestHandler;
 		};
 
 	public:
@@ -106,11 +116,18 @@ namespace callui {
 		ucl::Widget &getWidget();
 
 		/**
-		 * @brief Force hides volume control components
+		 * @brief Force hides volume control UI components
 		 */
 		void hideVolumeControls();
 
 		/**
+		 * @brief Gets volume control UI components visibility status
+		 * @return true - if volume control UI components are visible,
+		 *  false - if not
+		 */
+		bool getVolumeControlsVisibility();
+
+		/**
 		 * @brief Updates presenter
 		 * @param[in] cm Call Manager instance
 		 * @return RES_OK on success or another result otherwise
@@ -118,65 +135,20 @@ namespace callui {
 		ucl::Result update(const ICallManagerSRef &cm);
 
 		/**
-		 * @brief Gets volume button widget
-		 * @remark Use only for Screen Reader feature
-		 * @return Pointer to widget on success or NULL otherwise
+		 * @brief Gets next ATSPI access object according to
+		 *  relation flow direction
+		 * param[in] isFlowsTo ATSPI highlight flow relation flag
+		 *  (true for get to next object request,
+		 *  false for get to previous object request)
+		 *@return ATSPI object
 		 */
-		ucl::ElmWidget *getVolumBtn();
-
-		/**
-		 * @brief Gets bluetooth button widget
-		 * @remark Use only for Screen Reader feature
-		 * @return Widget on success or NULL otherwise
-		 */
-		ucl::ElmWidget *getBluetoothBtn();
-
-		/**
-		 * @brief Gets mute button widget
-		 * @remark Use only for Screen Reader feature
-		 * @return Pointer to widget on success or NULL otherwise
-		 */
-		ucl::ElmWidget *getMuteBtn();
-
-		/**
-		 * @brief Gets add Contact button widget
-		 * @remark Use only for Screen Reader feature
-		 * @return Pointer to widget on success or NULL otherwise
-		 */
-		ucl::ElmWidget *getAddContactBtn();
-
-		/**
-		 * @brief Gets Volume Control widget
-		 * @remark Use only for Screen Reader feature
-		 * @return Pointer to widget on success or NULL otherwise
-		 */
-		ucl::ElmWidget *getVolumeControlLy();
-
-		/**
-		 * @brief Gets Volume Controls decrease volume button widget
-		 * @remark Use only for Screen Reader feature
-		 * @return Pointer to widget on success or NULL otherwise
-		 */
-		ucl::ElmWidget *getVolumeControlDecreaseBtn();
-
-		/**
-		 * @brief Gets Volume Controls increase volume button widget
-		 * @remark Use only for Screen Reader feature
-		 * @return Pointer to widget on success or NULL otherwise
-		 */
-		ucl::ElmWidget *getVolumeControlIncreaseBtn();
-
-		/**
-		 * @brief Gets Volume Controls value text access object
-		 * @remark Use only for Screen Reader feature
-		 * @return Pointer to widget on success or NULL otherwise
-		 */
-		ucl::ElmWidget *getVolumeControlValueTxtAo();
+		Elm_Interface_Atspi_Accessible *getNextAo(bool isFlowsTo);
 
 	private:
 		AccessoryPresenter(ucl::IRefCountObj &rc,
 				ISoundManagerSRef sm,
-				NotiHandler handler);
+				NotiHandler exitHandler,
+				AoRequestHandler m_aoRequestHandler);
 		~AccessoryPresenter();
 
 		ucl::Result prepare(ucl::GuiPresenter &parent,
@@ -226,21 +198,30 @@ namespace callui {
 		ucl::Result setActiveCallCompomnents();
 		ucl::Result setEndCallCompomnents(const ICallManagerSRef &cm);
 
-		void registerVolumeControlAo();
-		void onVolumeControlScreenReaderReadStart(ucl::Widget &widget, void *eventInfo);
+		void onVolumeControlScreenReaderReadStart(ucl::Widget &widget,
+				void *eventInfo);
+
+		ucl::Result createAtspiHighlightHelper();
+		const Elm_Interface_Atspi_Accessible *onAtspiHighlight(
+				const Elm_Interface_Atspi_Accessible *ao,
+				Elm_Atspi_Relation_Type flowRelation);
+		void registerActiveCallAoCompomnents();
+		void registerEndCallAoCompomnents();
+		Elm_Interface_Atspi_Accessible *requestNextAo(bool isFlowsTo);
 
 	private:
 		const ISoundManagerSRef m_sm;
 		const NotiHandler m_exitHandler;
+		const AoRequestHandler m_aoRequestHandler;
 
 		ucl::LayoutSRef m_widget;
 		ucl::StyledWidgetSRef m_volumeBtn;
 		ucl::StyledWidgetSRef m_muteBtn;
 		ucl::StyledWidgetSRef m_bluetoothBtn;
 		ucl::StyledWidgetSRef m_addContactBtn;
-
 		SliderSRef m_slider;
 		VolumeControlSRef m_vc;
+		AtspiHighlightHelperSRef m_atspiHelper;
 
 		Ecore_Timer *m_vcTimer;
 		AudioStateType m_audioState;
diff --git a/call-ui/presenters/misc/MoreOptionsPresenter.cpp b/call-ui/presenters/misc/MoreOptionsPresenter.cpp
index 8ec22e9..415503a 100644
--- a/call-ui/presenters/misc/MoreOptionsPresenter.cpp
+++ b/call-ui/presenters/misc/MoreOptionsPresenter.cpp
@@ -20,6 +20,8 @@
 
 #include "ucl/appfw/types.h"
 
+#include "call-ui/view/AoSequencer.h"
+
 #include "call-ui/presenters/pages/KeypadPage.h"
 
 #include "call-ui/resources.h"
@@ -567,49 +569,22 @@ namespace callui {
 					const Elm_Interface_Atspi_Accessible *ao,
 					Elm_Atspi_Relation_Type flowRelation)
 	{
-		const auto swapBtnAo = utils::getAo(m_btnSwap.get());
-		const auto unholdBtnAo = utils::getAo(m_btnUnhold.get());
-		const auto keypadBtnAo = utils::getAo(m_btnKeypad.get());
-		const auto statusTxtAo = utils::getAo(m_statusTxtAo.get());
-		const auto fakeAo = utils::getAo(m_fakeAo.get());
-
-		if (ao == swapBtnAo) {
-			DLOG("Swap button");
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return keypadBtnAo;
-			}
-		} else if (ao == unholdBtnAo) {
-			DLOG("Unhold button");
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return keypadBtnAo;
-			}
-		} else if (ao == keypadBtnAo) {
-			DLOG("Keypad button");
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return statusTxtAo;
+		if (ao == as_ao(m_fakeAo)) {
+			if (m_btnSwap) {
+				return as_ao(m_btnSwap);
+			} else if (m_btnUnhold) {
+				return as_ao(m_btnUnhold);
 			} else {
-				if (swapBtnAo) {
-					return swapBtnAo;
-				} else if (unholdBtnAo) {
-					return unholdBtnAo;
-				}
-			}
-		} else if (ao == statusTxtAo) {
-			DLOG("Status text");
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_FROM) {
-				return keypadBtnAo;
-			}
-		} else if (ao == as_ao(getWindow()) || ao == fakeAo) {
-			DLOG("window or panelLy");
-			if (swapBtnAo) {
-				return swapBtnAo;
-			} else if (unholdBtnAo) {
-				return unholdBtnAo;
-			} else {
-				return keypadBtnAo;
+				return as_ao(m_btnKeypad);
 			}
 		}
-		LOG_RETURN_VALUE(RES_FAIL, nullptr, "Unknown object!");
+
+		return AoSequencer(ao, flowRelation).
+				process(m_btnSwap).
+				process(m_btnUnhold).
+				process(m_btnKeypad).
+				process(m_statusTxtAo).
+				getNext();
 	}
 
 	Result MoreOptionsPresenter::createAccessObjects()
diff --git a/call-ui/presenters/misc/RejectMsgPresenter.cpp b/call-ui/presenters/misc/RejectMsgPresenter.cpp
index 1f3b62f..9a7ec34 100644
--- a/call-ui/presenters/misc/RejectMsgPresenter.cpp
+++ b/call-ui/presenters/misc/RejectMsgPresenter.cpp
@@ -19,6 +19,8 @@
 #include "call-ui/presenters/items/RejectMsgListItem.h"
 #include "call-ui/presenters/misc/helpers.h"
 
+#include "call-ui/view/AoSequencer.h"
+
 #include "call-ui/resources.h"
 
 #include "call-ui/presenters/common.h"
@@ -156,19 +158,14 @@ namespace callui {
 
 		FAIL_RETURN(createWidget(parentWidget),
 				"createWidget() failed!");
-
 		FAIL_RETURN(createPanel(),
 				"createPanel() failed!");
-
 		FAIL_RETURN(createPanelBg(),
 				"createPanelBg() failed!");
-
 		FAIL_RETURN(createPanelLy(),
 				"createPanelLy() failed!");
-
 		FAIL_RETURN(createCircleSurfaceLy(),
 				"createCircleSurfaceLy() failed!");
-
 		FAIL_RETURN(createAtspiHighlightHelper(),
 				"createScreenReaderRoute() failed!");
 
@@ -491,31 +488,14 @@ namespace callui {
 			const Elm_Interface_Atspi_Accessible *ao,
 			Elm_Atspi_Relation_Type flowRelation)
 	{
-		DLOG("ENTER");
-
-		const Elm_Interface_Atspi_Accessible * firstListAo = nullptr;
-		if (m_firstItem) {
-			firstListAo = as_ao(*m_firstItem);
-		}
-		const Elm_Interface_Atspi_Accessible * lastListAo = nullptr;
-		if (m_lastItem) {
-			lastListAo = as_ao(*m_lastItem);
-		}
-
-		if (ao == firstListAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return nullptr;
-			}
-		} else if (ao == lastListAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_FROM) {
-				return nullptr;
-			}
-		} else if (ao == as_ao(getWindow())) {
-			return firstListAo;
-		} else {
-			LOG_RETURN_VALUE(RES_FAIL, nullptr, "Unknown object!");
+		if (ao == as_ao(getWindow())) {
+			return as_ao(m_firstItem);
 		}
 
-		return ao;
+		return AoSequencer(ao, flowRelation).
+				process(m_firstItem).
+				processDefault().
+				process(m_lastItem).
+				getNext();
 	}
 }
diff --git a/call-ui/presenters/pages/KeypadPage.cpp b/call-ui/presenters/pages/KeypadPage.cpp
index 2911c99..95559d9 100644
--- a/call-ui/presenters/pages/KeypadPage.cpp
+++ b/call-ui/presenters/pages/KeypadPage.cpp
@@ -16,6 +16,8 @@
 
 #include "KeypadPage.h"
 
+#include "call-ui/view/AoSequencer.h"
+
 #include "call-ui/resources.h"
 
 #include "call-ui/presenters/types.h"
@@ -161,18 +163,16 @@ namespace callui {
 	{
 		FAIL_RETURN(createWidget(),
 				"createWidget() failed!");
-
 		FAIL_RETURN(createEntry(),
 				"createEntry() failed!");
-
 		FAIL_RETURN(createButtons(),
 				"createButtons() failed!");
-
 		FAIL_RETURN(createVolumeControl(),
 				"createVolumeControl() failed!");
-
 		FAIL_RETURN(registerPowerKeyHandling(),
 				"registerPowerKeyHandling() failed!");
+		FAIL_RETURN(createAtspiHighlightHelper(),
+				"createAtspiHighlightHelper() failed!");
 
 		registerCallbacks();
 
@@ -303,37 +303,37 @@ namespace callui {
 
 	ucl::Result KeypadPage::createButtons()
 	{
-		Evas_Object *button;
-		StyledWidgetSRef buttonSRef;
+		Evas_Object *eo;
+		StyledWidgetSRef btn;
 
 		for (int i = 0; i < impl::KEYPAD_BTN_MAX_COUNT; ++i) {
-			button = elm_button_add(as_eo(*m_widget));
-			if (!button) {
+			eo = elm_button_add(as_eo(*m_widget));
+			if (!eo) {
 				LOG_RETURN(RES_FAIL, "elm_button_add() failed!");
 			}
 
-			buttonSRef = makeShared<StyledWidget>(button, false);
-			buttonSRef->bindToEo();
-			buttonSRef->setData(impl::BTN_DATA_KEY, &(impl::buttonsInfo[i]));
-			buttonSRef->setStyle(impl::buttonsInfo[i].style);
+			btn = makeShared<StyledWidget>(eo, false);
+			btn->setData(impl::BTN_DATA_KEY, &(impl::buttonsInfo[i]));
+			btn->setStyle(impl::buttonsInfo[i].style);
+			m_widget->setContent(*btn, impl::buttonsInfo[i].swlPart);
+			show(*btn);
 
 			if (impl::buttonsInfo[i].type == impl::OperationType::DTMF) {
-				buttonSRef->addEventHandler(impl::BTN_PRESSED,
+				btn->addEventHandler(impl::BTN_PRESSED,
 						WEAK_DELEGATE_THIS(onBtnPressed));
 
-				buttonSRef->addEventHandler(impl::BTN_UNPRESSED,
+				btn->addEventHandler(impl::BTN_UNPRESSED,
 						WEAK_DELEGATE_THIS(onBtnUnpressed));
 			} else {
-				buttonSRef->addEventHandler(BTN_CLICKED,
+				btn->addEventHandler(BTN_CLICKED,
 						WEAK_DELEGATE_THIS(onBtnClicked));
 
 				// RTL support
-				elm_object_mirrored_automatic_set(button, EINA_FALSE);
-				elm_object_mirrored_set(button, false);
+				elm_object_mirrored_automatic_set(eo, EINA_FALSE);
+				elm_object_mirrored_set(eo, false);
 			}
 
-			// Screen Reader
-			auto &atspi = buttonSRef->getAtspi();
+			auto &atspi = btn->getAtspi();
 			atspi.setTDomain(TEXT_DOMAIN);
 			if (impl::buttonsInfo[i].type == impl::OperationType::DTMF) {
 				atspi.setName(impl::buttonsInfo[i].str);
@@ -341,8 +341,11 @@ namespace callui {
 				atspi.setName(STR_VOLUME);
 			}
 
-			m_widget->setContent(*buttonSRef, impl::buttonsInfo[i].swlPart);
-			show(*buttonSRef);
+			if (i == 0) {
+				m_firstBtn = btn;
+			} else if (i == impl::KEYPAD_BTN_MAX_COUNT - 1) {
+				m_lastBtn = btn;
+			}
 		}
 
 		return RES_OK;
@@ -385,7 +388,11 @@ namespace callui {
 		m_vc->resize(w, h);
 		hide(*m_vc);
 
-		registerVolumeControlAo();
+		m_vc->getDecreaseBtn().addEventHandler(ATSPI_HIGHLIGHTED,
+				WEAK_DELEGATE_THIS(onVolumeControlScreenReaderReadStart));
+
+		m_vc->getIncreaseBtn().addEventHandler(ATSPI_HIGHLIGHTED,
+				WEAK_DELEGATE_THIS(onVolumeControlScreenReaderReadStart));
 
 		return RES_OK;
 	}
@@ -584,12 +591,14 @@ namespace callui {
 				WEAK_DELEGATE_THIS(onAtspiHighlight));
 
 		m_atspiHelper->registerObject(getWindow());
-		m_atspiHelper->registerObject(*getFirstButton());
-		m_atspiHelper->registerObject(*getLastButton());
-		m_atspiHelper->registerObject(*m_vc.get());
-		m_atspiHelper->registerObject(*m_vc->getDecreaseBtn());
-		m_atspiHelper->registerObject(*m_vc->getIncreaseBtn());
-		m_atspiHelper->registerObject(*m_vc->getValueTxtAo());
+
+		m_atspiHelper->registerObject(*m_firstBtn);
+		m_atspiHelper->registerObject(*m_lastBtn);
+
+		m_atspiHelper->registerObject(*m_vc);
+		m_atspiHelper->registerObject(m_vc->getDecreaseBtn());
+		m_atspiHelper->registerObject(m_vc->getIncreaseBtn());
+		m_atspiHelper->registerObject(m_vc->getValueTxtAo());
 
 		return RES_OK;
 	}
@@ -598,80 +607,25 @@ namespace callui {
 				const Elm_Interface_Atspi_Accessible *ao,
 				Elm_Atspi_Relation_Type flowRelation)
 	{
-		DLOG();
-
-		auto firstBtnAo = utils::getAo(getFirstButton());
-		auto lastBtnAo = utils::getAo(getLastButton());
-		auto vcLayoutAo = utils::getAo(m_vc.get());
-		auto vcDecrVolumeBtnAo = utils::getAo(m_vc->getDecreaseBtn());
-		auto vcIncrVolumeBtnAo = utils::getAo(m_vc->getIncreaseBtn());
-		auto vcVolumeValueAo = utils::getAo(m_vc->getValueTxtAo());
-
-		if (firstBtnAo && ao == firstBtnAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return nullptr;
-			}
-		} else if (lastBtnAo && ao == lastBtnAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_FROM) {
-				return nullptr;
-			}
-		} else if (ao == vcLayoutAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return vcDecrVolumeBtnAo;
-			}
-		} else if (ao == vcDecrVolumeBtnAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return vcVolumeValueAo;
-			} else {
-				return vcLayoutAo;
-			}
-		} else if (ao == vcVolumeValueAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return vcIncrVolumeBtnAo;
-			} else {
-				return vcDecrVolumeBtnAo;
-			}
-		} else if (ao == vcIncrVolumeBtnAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_FROM) {
-				return vcVolumeValueAo;
-			}
-		} else if (ao == as_ao(getWindow())) {
-			if (firstBtnAo) {
-				return firstBtnAo;
+		if (m_vc->isVisible()) {
+			if (ao == as_ao(getWindow())) {
+				return as_ao(m_vc);
 			}
+			return AoSequencer(ao, flowRelation).
+					process(m_vc).
+					process(m_vc->getDecreaseBtn()).
+					process(m_vc->getValueTxtAo()).
+					process(m_vc->getIncreaseBtn()).
+					getNext();
 		} else {
-			LOG_RETURN_VALUE(RES_FAIL, nullptr, "Unknown object!");
-		}
-
-		return ao;
-	}
-
-	ElmWidget *KeypadPage::getFirstButton()
-	{
-		return dynamicWidgetCast<ElmWidget>(
-				m_widget->getContent(impl::buttonsInfo[0].swlPart));
-	}
-
-	ElmWidget *KeypadPage::getLastButton()
-	{
-		return dynamicWidgetCast<ElmWidget>(
-				m_widget->getContent(impl::buttonsInfo[(
-						impl::KEYPAD_BTN_MAX_COUNT - 1)].swlPart));
-	}
-
-	void KeypadPage::registerVolumeControlAo()
-	{
-		auto decrBtn = m_vc->getDecreaseBtn();
-
-		if (decrBtn) {
-			decrBtn->addEventHandler(ATSPI_HIGHLIGHTED,
-					WEAK_DELEGATE_THIS(onVolumeControlScreenReaderReadStart));
-		}
-
-		auto incrBtn = m_vc->getIncreaseBtn();
-		if (incrBtn) {
-			incrBtn->addEventHandler(ATSPI_HIGHLIGHTED,
-					WEAK_DELEGATE_THIS(onVolumeControlScreenReaderReadStart));
+			if (ao == as_ao(getWindow())) {
+				return as_ao(m_firstBtn);
+			}
+			return AoSequencer(ao, flowRelation).
+					process(m_firstBtn).
+					processDefault().
+					process(m_lastBtn).
+					getNext();
 		}
 	}
 
diff --git a/call-ui/presenters/pages/KeypadPage.h b/call-ui/presenters/pages/KeypadPage.h
index 5938aa8..b9f7987 100644
--- a/call-ui/presenters/pages/KeypadPage.h
+++ b/call-ui/presenters/pages/KeypadPage.h
@@ -120,9 +120,6 @@ namespace callui {
 		const Elm_Interface_Atspi_Accessible *onAtspiHighlight(
 				const Elm_Interface_Atspi_Accessible *ao,
 				Elm_Atspi_Relation_Type flowRelation);
-		ucl::ElmWidget *getFirstButton();
-		ucl::ElmWidget *getLastButton();
-		void registerVolumeControlAo();
 		void onVolumeControlScreenReaderReadStart(
 				ucl::Widget &widget,
 				void *eventInfo);
@@ -136,6 +133,8 @@ namespace callui {
 
 		ucl::LayoutSRef m_widget;
 		ucl::ElmWidgetSRef m_entry;
+		ucl::ElmWidgetSRef m_firstBtn;
+		ucl::ElmWidgetSRef m_lastBtn;
 
 		bool m_smInUse;
 
diff --git a/call-ui/presenters/pages/MainPage.cpp b/call-ui/presenters/pages/MainPage.cpp
index da99bd9..903ecd3 100644
--- a/call-ui/presenters/pages/MainPage.cpp
+++ b/call-ui/presenters/pages/MainPage.cpp
@@ -19,6 +19,8 @@
 #include "ucl/gui/Window.h"
 #include "ucl/gui/Widget.h"
 
+#include "call-ui/view/AoSequencer.h"
+
 #include "call-ui/resources.h"
 
 #include "call-ui/presenters/types.h"
@@ -525,6 +527,8 @@ namespace callui {
 				setSoundManager(m_call->getSoundManager()).
 				setCallManager(m_cm).
 				setRequestExitHandler(WEAK_DELEGATE_THIS(onExitAppRequest)).
+				setAoRequestHandler(
+						WEAK_DELEGATE_THIS(onAccessoryAoRequest)).
 				setParentWidget(m_widget).
 				build(*this);
 
@@ -715,52 +719,32 @@ namespace callui {
 
 	void MainPage::registerIncomingCallModeAo()
 	{
-		DLOG("ENTER");
 		m_atspiHelper->setEventHandler(
 				WEAK_DELEGATE_THIS(onIncomingCallModeAtspiHighlight));
 
-		auto acceptAo = m_acceptRejectPrs->getAcceptAo();
-		if (!acceptAo) {
-			DLOG("acceptAO is NULL");
-		} else {
+		if (const auto acceptAo = m_acceptRejectPrs->getAcceptAo()) {
 			m_atspiHelper->registerObject(*acceptAo);
 		}
 
-		auto rejectAo = m_acceptRejectPrs->getRejectAo();
-		if (!rejectAo) {
-			DLOG("rejectAo is NULL");
-		} else {
+		if (const auto rejectAo = m_acceptRejectPrs->getRejectAo()) {
 			m_atspiHelper->registerObject(*rejectAo);
 		}
 
-		auto statusTxtAo = m_callInfoPrs->getStatusTxtAo();
-		if (!statusTxtAo) {
-			DLOG("statusTxtAo is NULL");
-		} else {
+		if (const auto statusTxtAo = m_callInfoPrs->getStatusTxtAo()) {
 			m_atspiHelper->registerObject(*statusTxtAo);
 		}
 
-		auto mainTxtAo = m_callInfoPrs->getMainTxtAo();
-		if (!mainTxtAo) {
-			DLOG("mainTxtAo is NULL");
-		} else {
+		if (const auto mainTxtAo = m_callInfoPrs->getMainTxtAo()) {
 			m_atspiHelper->registerObject(*mainTxtAo);
 		}
 
-		auto subTxtAo = m_callInfoPrs->getSubTxtAo();
-		if (!subTxtAo) {
-			DLOG("subTxtAo is NULL");
-		} else {
+		if (const auto subTxtAo = m_callInfoPrs->getSubTxtAo()) {
 			m_atspiHelper->registerObject(*subTxtAo);
 		}
 
-		if (!m_rmCueAo) {
-			DLOG("m_rmCueAo is NULL");
-		} else {
+		if (m_rmCueAo) {
 			m_atspiHelper->registerObject(*m_rmCueAo);
 		}
-
-		DLOG("EXIT");
 	}
 
 	const Elm_Interface_Atspi_Accessible *
@@ -768,132 +752,40 @@ namespace callui {
 					const Elm_Interface_Atspi_Accessible *ao,
 					Elm_Atspi_Relation_Type flowRelation)
 	{
-		const auto acceptAo = utils::getAo(m_acceptRejectPrs->getAcceptAo());
-		const auto rejectAo = utils::getAo(m_acceptRejectPrs->getRejectAo());
-		const auto statusTxtAo = utils::getAo(m_callInfoPrs->getStatusTxtAo());
-		const auto mainTxtAo = utils::getAo(m_callInfoPrs->getMainTxtAo());
-		const auto subTxtAo = utils::getAo(m_callInfoPrs->getSubTxtAo());
-		const auto rmCueAo = utils::getAo(m_rmCueAo.get());
-
-		if (ao == acceptAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return statusTxtAo;
-			}
-		} else if (ao == statusTxtAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return mainTxtAo;
-			} else if (flowRelation == ELM_ATSPI_RELATION_FLOWS_FROM) {
-				return acceptAo;
-			}
-		} else if (ao == mainTxtAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return (subTxtAo) ? subTxtAo : rejectAo;
-			} else if (flowRelation == ELM_ATSPI_RELATION_FLOWS_FROM) {
-				return statusTxtAo;
-			}
-		} else if (ao == subTxtAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return rejectAo;
-			} else if (flowRelation == ELM_ATSPI_RELATION_FLOWS_FROM) {
-				return mainTxtAo;
-			}
-		} else if (ao == rejectAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return rmCueAo ? rmCueAo : ao;
-			} else if (flowRelation == ELM_ATSPI_RELATION_FLOWS_FROM) {
-				return (subTxtAo) ? subTxtAo : mainTxtAo;
-			}
-		} else if (ao == rmCueAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_FROM) {
-				return rmCueAo;
-			}
-		} else if (ao == as_ao(getWindow())) {
-			return acceptAo;
-		} else {
-			LOG_RETURN_VALUE(RES_FAIL, nullptr, "Unknown object!");
-		}
-
-		return ao;
+		return AoSequencer(ao, flowRelation).
+				process(m_acceptRejectPrs->getAcceptAo()).
+				process(m_callInfoPrs->getStatusTxtAo()).
+				process(m_callInfoPrs->getMainTxtAo()).
+				process(m_callInfoPrs->getSubTxtAo()).
+				process(m_acceptRejectPrs->getRejectAo()).
+				process(m_rmCueAo).
+				getNext();
 	}
 
 	void MainPage::registerActiveCallModeAo()
 	{
-		DLOG("ENTER");
 		m_atspiHelper->setEventHandler(
 				WEAK_DELEGATE_THIS(onActiveCallModeAtspiHighlight));
 
-		auto statusTxtAo = m_callInfoPrs->getStatusTxtAo();
-		if (!statusTxtAo) {
-			DLOG("statusTxtAo is NULL");
-		} else {
+		if (const auto statusTxtAo = m_callInfoPrs->getStatusTxtAo()) {
 			m_atspiHelper->registerObject(*statusTxtAo);
 		}
 
-		auto mainTxtAo = m_callInfoPrs->getMainTxtAo();
-		if (!mainTxtAo) {
-			DLOG("mainTxtAo is NULL");
-		} else {
+		if (const auto mainTxtAo = m_callInfoPrs->getMainTxtAo()) {
 			m_atspiHelper->registerObject(*mainTxtAo);
 		}
 
-		auto subTxtAo = m_callInfoPrs->getSubTxtAo();
-		if (!subTxtAo) {
-			DLOG("subTxtAo is NULL");
-		} else {
+		if (const auto subTxtAo = m_callInfoPrs->getSubTxtAo()) {
 			m_atspiHelper->registerObject(*subTxtAo);
 		}
 
-		auto volumeBtnAo = m_accessoryPrs->getVolumBtn();
-		if (!volumeBtnAo) {
-			DLOG("volumeBtnAo is NULL");
-		} else {
-			m_atspiHelper->registerObject(*volumeBtnAo);
-		}
-
-		auto bluetoothBtnAo = m_accessoryPrs->getBluetoothBtn();
-		if (!bluetoothBtnAo) {
-			DLOG("bluetoothBtnAo is NULL");
-		} else {
-			m_atspiHelper->registerObject(*bluetoothBtnAo);
-		}
-
-		auto muteBtnAo = m_accessoryPrs->getMuteBtn();
-		if (!muteBtnAo) {
-			DLOG("muteBtnAo is NULL");
-		} else {
-			m_atspiHelper->registerObject(*muteBtnAo);
-		}
-
-		auto moreOptCueAo = m_moreOptionsPrs->getCueAo();
-		if (!moreOptCueAo) {
-			DLOG("moreCueAo is NULL");
-		} else {
+		if (const auto moreOptCueAo = m_moreOptionsPrs->getCueAo()) {
 			m_atspiHelper->registerObject(*moreOptCueAo);
 		}
 
-		if (!m_bottomBtn) {
-			DLOG("m_bottomBtn is NULL");
-		} else {
+		if (m_bottomBtn) {
 			m_atspiHelper->registerObject(*m_bottomBtn);
 		}
-
-		auto vcLayout = m_accessoryPrs->getVolumeControlLy();
-		if (!vcLayout) {
-			DLOG("vcLayout is NULL");
-		} else {
-			m_atspiHelper->registerObject(*vcLayout);
-
-			m_atspiHelper->registerObject(*m_accessoryPrs->
-					getVolumeControlDecreaseBtn());
-
-			m_atspiHelper->registerObject(*m_accessoryPrs->
-					getVolumeControlIncreaseBtn());
-
-			m_atspiHelper->registerObject(*m_accessoryPrs->
-					getVolumeControlValueTxtAo());
-		}
-
-		DLOG("EXIT");
 	}
 
 	const Elm_Interface_Atspi_Accessible *
@@ -901,109 +793,21 @@ namespace callui {
 					const Elm_Interface_Atspi_Accessible *ao,
 					Elm_Atspi_Relation_Type flowRelation)
 	{
-		const auto statusTxtAo =
-				utils::getAo(m_callInfoPrs->getStatusTxtAo());
-		const auto mainTxtAo =
-				utils::getAo(m_callInfoPrs->getMainTxtAo());
-		const auto subTxtAo =
-				utils::getAo(m_callInfoPrs->getSubTxtAo());
-		const auto volumeBtnAo =
-				utils::getAo(m_accessoryPrs->getVolumBtn());
-		const auto bluetoothBtnAo =
-				utils::getAo(m_accessoryPrs->getBluetoothBtn());
-		const auto muteBtnAo =
-				utils::getAo(m_accessoryPrs->getMuteBtn());
-		const auto moreOptCueAo =
-				utils::getAo(m_moreOptionsPrs->getCueAo());
-		const auto vcLayout =
-				utils::getAo(m_accessoryPrs->getVolumeControlLy());
-		const auto vcDecrVolumeBtn =
-				utils::getAo(m_accessoryPrs->getVolumeControlDecreaseBtn());
-		const auto vcIncrVolumeBtn =
-				utils::getAo(m_accessoryPrs->getVolumeControlIncreaseBtn());
-		const auto vcVolumeValueAo =
-				utils::getAo(m_accessoryPrs->getVolumeControlValueTxtAo());
-		const auto bottomBtnAo = utils::getAo(m_bottomBtn.get());
-
-		if (ao == statusTxtAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return mainTxtAo;
-			}
-		} else if (ao == mainTxtAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				if (subTxtAo) {
-					return subTxtAo;
-				} else {
-					return volumeBtnAo;
-				}
-			} else {
-				return statusTxtAo;
-			}
-		} else if (ao == subTxtAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return volumeBtnAo;
-			} else {
-				return mainTxtAo;
-			}
-		} else if (ao == volumeBtnAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return bluetoothBtnAo;
-			} else {
-				if (subTxtAo) {
-					return subTxtAo;
-				} else {
-					return mainTxtAo;
-				}
-			}
-		} else if (ao == bluetoothBtnAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return muteBtnAo;
-			} else {
-				return volumeBtnAo;
-			}
-		} else if (ao == muteBtnAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return moreOptCueAo;
-			} else {
-				return bluetoothBtnAo;
-			}
-		} else if (ao == moreOptCueAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-					return bottomBtnAo;
-			} else {
-				return muteBtnAo;
-			}
-		} else if (ao == bottomBtnAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_FROM) {
-				return moreOptCueAo;
-			}
-		} else if (ao == vcLayout) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return vcDecrVolumeBtn;
-			}
-		} else if (ao == vcDecrVolumeBtn) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return vcVolumeValueAo;
-			} else {
-				return vcLayout;
-			}
-		} else if (ao == vcVolumeValueAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return vcIncrVolumeBtn;
-			} else {
-				return vcDecrVolumeBtn;
-			}
-		} else if (ao == vcIncrVolumeBtn) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_FROM) {
-				return vcVolumeValueAo;
+		if (ao == as_ao(getWindow())) {
+			if (m_accessoryPrs->getVolumeControlsVisibility()) {
+				m_accessoryPrs->getNextAo(true);
 			}
-		} else if (ao == as_ao(getWindow())) {
-			return statusTxtAo;
-		} else {
-			LOG_RETURN_VALUE(RES_FAIL, nullptr, "Unknown object!");
 		}
 
-		return ao;
+		return AoSequencer(ao, flowRelation).
+				process(m_callInfoPrs->getStatusTxtAo()).
+				process(m_callInfoPrs->getMainTxtAo()).
+				process(m_callInfoPrs->getSubTxtAo()).
+				process(m_accessoryPrs->getNextAo(true)).
+				process(m_accessoryPrs->getNextAo(false)).
+				process(m_moreOptionsPrs->getCueAo()).
+				process(m_bottomBtn).
+				getNext();
 	}
 
 	void MainPage::registerEndCallModeAo()
@@ -1011,34 +815,17 @@ namespace callui {
 		m_atspiHelper->setEventHandler(
 				WEAK_DELEGATE_THIS(onEndCallModeAtspiHighlight));
 
-		auto statusTxtAo = m_callInfoPrs->getStatusTxtAo();
-		if (!statusTxtAo) {
-			DLOG("statusTxtAo is NULL");
-		} else {
+		if (const auto statusTxtAo = m_callInfoPrs->getStatusTxtAo()) {
 			m_atspiHelper->registerObject(*statusTxtAo);
 		}
 
-		auto mainTxtAo = m_callInfoPrs->getMainTxtAo();
-		if (!mainTxtAo) {
-			DLOG("mainTxtAo is NULL");
-		} else {
+		if (const auto mainTxtAo = m_callInfoPrs->getMainTxtAo()) {
 			m_atspiHelper->registerObject(*mainTxtAo);
 		}
 
-		auto addContactsBtnAo = m_accessoryPrs->getAddContactBtn();
-		if (!addContactsBtnAo) {
-			DLOG("addContactsBtnAo is NULL");
-		} else {
-			m_atspiHelper->registerObject(*addContactsBtnAo);
-		}
-
-		if (!m_bottomBtn) {
-			DLOG("m_bottomBtn is NULL");
-		} else {
+		if (m_bottomBtn) {
 			m_atspiHelper->registerObject(*m_bottomBtn);
 		}
-
-		DLOG("EXIT");
 	}
 
 	const Elm_Interface_Atspi_Accessible *
@@ -1046,50 +833,26 @@ namespace callui {
 					const Elm_Interface_Atspi_Accessible *ao,
 					Elm_Atspi_Relation_Type flowRelation)
 	{
-		DLOG();
-
-		const auto statusTxtAo =
-				utils::getAo(m_callInfoPrs->getStatusTxtAo());
-		const auto mainTxtAo =
-				utils::getAo(m_callInfoPrs->getMainTxtAo());
-		const auto addContactsBtnAo =
-				utils::getAo(m_accessoryPrs->getAddContactBtn());
-		const auto bottomBtnAo = utils::getAo(m_bottomBtn.get());
-
-		if (ao == statusTxtAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return mainTxtAo;
-			}
-		} else if (ao == mainTxtAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				if (addContactsBtnAo) {
-					return addContactsBtnAo;
-				} else {
-					return bottomBtnAo;
-				}
-			} else {
-				return statusTxtAo;
-			}
-		} else if (ao == addContactsBtnAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_TO) {
-				return bottomBtnAo;
-			} else {
-				return mainTxtAo;
-			}
-		} else if (ao == bottomBtnAo) {
-			if (flowRelation == ELM_ATSPI_RELATION_FLOWS_FROM) {
-				if (addContactsBtnAo) {
-					return addContactsBtnAo;
-				} else {
-					return mainTxtAo;
-				}
-			}
-		} else if (ao == as_ao(getWindow())) {
-			return statusTxtAo;
+		return AoSequencer(ao, flowRelation).
+				process(m_callInfoPrs->getStatusTxtAo()).
+				process(m_callInfoPrs->getMainTxtAo()).
+				process(m_accessoryPrs->getNextAo(true)).
+				process(m_accessoryPrs->getNextAo(false)).
+				process(m_bottomBtn).
+				getNext();
+	}
+
+	Elm_Interface_Atspi_Accessible *
+			MainPage::onAccessoryAoRequest(bool isFlowsTo)
+	{
+		if (isFlowsTo) {
+			return (m_mode == CallMode::END) ? as_ao(m_bottomBtn) :
+					as_ao(m_moreOptionsPrs->getCueAo());
 		} else {
-			LOG_RETURN_VALUE(RES_FAIL, nullptr, "Unknown object!");
+			const auto subTxtAo = m_callInfoPrs->getSubTxtAo();
+			return (subTxtAo ? as_ao(subTxtAo) :
+					as_ao(m_callInfoPrs->getMainTxtAo()));
 		}
-
-		return ao;
+		return nullptr;
 	}
 }
diff --git a/call-ui/presenters/pages/MainPage.h b/call-ui/presenters/pages/MainPage.h
index c6654c0..0eeb700 100644
--- a/call-ui/presenters/pages/MainPage.h
+++ b/call-ui/presenters/pages/MainPage.h
@@ -145,6 +145,7 @@ namespace callui {
 		const Elm_Interface_Atspi_Accessible *onEndCallModeAtspiHighlight(
 				const Elm_Interface_Atspi_Accessible *ao,
 				Elm_Atspi_Relation_Type flowRelation);
+		Elm_Interface_Atspi_Accessible *onAccessoryAoRequest(bool isFlowsTo);
 
 		// Page //
 
diff --git a/call-ui/presenters/types.h b/call-ui/presenters/types.h
index eff272d..eb270f8 100644
--- a/call-ui/presenters/types.h
+++ b/call-ui/presenters/types.h
@@ -24,11 +24,23 @@
 
 namespace callui {
 
+	/**
+	 * @brief Power button event info structure
+	 */
 	struct PowerBtnEventInfo {
 		bool stopPropagation = false;
 	};
 
+	/**
+	 * @brief Map of text-containing edje parts
+	 */
 	using PartTextMap = ucl::HashMap<ucl::EdjePart, ucl::TString>;
+
+	/**
+	 * @brief Access object request handler definition
+	 */
+	using AoRequestHandler = ucl::WeakDelegate<
+			Elm_Interface_Atspi_Accessible *(bool)>;
 }
 
 #endif // __CALL_UI_PRESENTERS_TYPES_H__
diff --git a/call-ui/view/VolumeControl.cpp b/call-ui/view/VolumeControl.cpp
index 478070d..f775e63 100644
--- a/call-ui/view/VolumeControl.cpp
+++ b/call-ui/view/VolumeControl.cpp
@@ -183,19 +183,19 @@ namespace callui {
 		}
 	}
 
-	ElmWidget *VolumeControl::getDecreaseBtn()
+	ElmWidget &VolumeControl::getDecreaseBtn()
 	{
-		return &m_decreaseBtn;
+		return m_decreaseBtn;
 	}
 
-	ElmWidget *VolumeControl::getIncreaseBtn()
+	ElmWidget &VolumeControl::getIncreaseBtn()
 	{
-		return &m_increaseBtn;
+		return m_increaseBtn;
 	}
 
-	ElmWidget *VolumeControl::getValueTxtAo()
+	ElmWidget &VolumeControl::getValueTxtAo()
 	{
-		return m_valueTxtAo.get();
+		return *m_valueTxtAo;
 	}
 
 	void VolumeControl::registerAccessObjectInformation()
diff --git a/call-ui/view/VolumeControl.h b/call-ui/view/VolumeControl.h
index 5b14b8d..6a08fde 100644
--- a/call-ui/view/VolumeControl.h
+++ b/call-ui/view/VolumeControl.h
@@ -130,23 +130,23 @@ namespace callui {
 		/**
 		 * @brief Gets Access object of decrease volume button
 		 * @remark Use only for Screen Reader feature
-		 * @return Pointer to widget on success or NULL otherwise
+		 * @return Reference to widget
 		 */
-		ucl::ElmWidget *getDecreaseBtn();
+		ucl::ElmWidget &getDecreaseBtn();
 
 		/**
 		 * @brief Gets Access object of increase volume button
 		 * @remark Use only for Screen Reader feature
-		 * @return Pointer to widget on success or NULL otherwise
+		 * @return Reference to widget
 		 */
-		ucl::ElmWidget *getIncreaseBtn();
+		ucl::ElmWidget &getIncreaseBtn();
 
 		/**
 		 * @brief Gets Access object of volume value text area
 		 * @remark Use only for Screen Reader feature
-		 * @return Pointer to widget on success or NULL otherwise
+		 * @return Reference to widget
 		 */
-		ucl::ElmWidget *getValueTxtAo();
+		ucl::ElmWidget &getValueTxtAo();
 
 		// Slider //