convert tab view to use onEvent to handle events instead of the manual registration.

remove padding from base page.

Platformio/OmoteUI/core/page/PageBase.cpp

@@ -9,7 +9,7 @@ Base::Base(ID aID)
 Base::Base(lv_obj_t *aLvglSelf, ID aID) : UIElement(aLvglSelf, aID) {
   SetHeight(lv_pct(100));
   SetWidth(lv_pct(100));
-  lv_obj_set_align(aLvglSelf, LV_ALIGN_CENTER);
+  SetPadding(Padding()); // Set Padding to default
 }
 // Return non owning refrence to widget
 UI::Widget::Base *Base::AddWidget(Widget::Base::Ptr aWidget) {

Platformio/OmoteUI/core/page/TabView.cpp

@@ -29,10 +29,7 @@ void Tab::OnHide() { mContent->OnHide(); };
 TabView::TabView(ID aId)
     : Base(lv_tabview_create(Screen::BackgroundScreen::getLvInstance(),
                              LV_DIR_TOP, 0),
-           aId) {
-  lv_obj_add_event_cb(LvglSelf(), HandleTabChangeImpl, LV_EVENT_VALUE_CHANGED,
-                      nullptr);
-}
+           aId) {}
 
 void TabView::AddTab(Page::Base::Ptr aPage, std::string aTitle) {
   auto tab = std::make_unique<Tab>(
@@ -64,17 +61,15 @@ void TabView::HandleTabChange() {
   }
 }
 
-void TabView::HandleTabChangeImpl(lv_event_t *aTabChangeEvent) {
-  auto self =
-      UIElement::GetElement<TabView *>(lv_event_get_target(aTabChangeEvent));
-  if (self) {
-    self->HandleTabChange();
-  }
-}
-
 bool TabView::KeyEvent(KeyPressAbstract::KeyEvent aKeyEvent) {
   if (OnKeyEvent(aKeyEvent)) {
     return true;
   }
   return mTabs[GetCurrentTabIdx()]->KeyEvent(aKeyEvent);
 };
+
+void TabView::OnLvglEvent(lv_event_t *anEvent) {
+  if (anEvent->code == LV_EVENT_VALUE_CHANGED) {
+    HandleTabChange();
+  }
+}

Platformio/OmoteUI/core/page/TabView.hpp

@@ -37,12 +37,12 @@ public:
   bool KeyEvent(KeyPressAbstract::KeyEvent aKeyEvent) override;
 
 protected:
-  void OnShow() {}
-  void OnHide() {}
+  void OnLvglEvent(lv_event_t *anEvent) override;
+  void OnShow() override {}
+  void OnHide() override {}
 
 private:
   void HandleTabChange();
-  static void HandleTabChangeImpl(lv_event_t *aTabChangeEvent);
 
   std::vector<Page::Tab::Ptr> mTabs;
 };