Close #22223: Move to the selected page when switching modes

app/src/main/java/org/mozilla/fenix/tabstray/TabLayoutMediator.kt

@@ -5,6 +5,7 @@
 package org.mozilla.fenix.tabstray
 
 import androidx.annotation.VisibleForTesting
+import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 import mozilla.components.browser.state.store.BrowserStore
 import mozilla.components.support.base.feature.LifecycleAwareFeature
@@ -21,6 +22,7 @@ import org.mozilla.fenix.utils.Do
  */
 class TabLayoutMediator(
     private val tabLayout: TabLayout,
+    private val tabPager: ViewPager2,
     interactor: TabsTrayInteractor,
     private val browsingModeManager: BrowsingModeManager,
     private val tabsTrayStore: TabsTrayStore,
@@ -55,6 +57,7 @@ class TabLayoutMediator(
 
     fun selectTabAtPosition(position: Int) {
         tabLayout.getTabAt(position)?.select()
+        tabPager.setCurrentItem(position, false)
         tabsTrayStore.dispatch(TabsTrayAction.PageSelected(Page.positionToPage(position)))
     }
 }

app/src/main/java/org/mozilla/fenix/tabstray/TabsTrayFragment.kt

@@ -254,6 +254,7 @@ class TabsTrayFragment : AppCompatDialogFragment() {
         tabLayoutMediator.set(
             feature = TabLayoutMediator(
                 tabLayout = tabsTrayBinding.tabLayout,
+                tabPager = tabsTrayBinding.tabsTray,
                 interactor = tabsTrayInteractor,
                 browsingModeManager = activity.browsingModeManager,
                 tabsTrayStore = tabsTrayStore,

app/src/test/java/org/mozilla/fenix/tabstray/TabLayoutMediatorTest.kt

@@ -4,6 +4,7 @@
 
 package org.mozilla.fenix.tabstray
 
+import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 import io.mockk.every
 import io.mockk.mockk
@@ -23,10 +24,11 @@ class TabLayoutMediatorTest {
     private val metrics: MetricController = mockk(relaxed = true)
     private val tabLayout: TabLayout = mockk(relaxed = true)
     private val tab: TabLayout.Tab = mockk(relaxed = true)
+    private val viewPager: ViewPager2 = mockk(relaxed = true)
 
     @Test
     fun `page to normal tab position when mode is also normal`() {
-        val mediator = TabLayoutMediator(tabLayout, interactor, modeManager, tabsTrayStore, metrics)
+        val mediator = TabLayoutMediator(tabLayout, viewPager, interactor, modeManager, tabsTrayStore, metrics)
 
         every { modeManager.mode }.answers { BrowsingMode.Normal }
         every { tabLayout.getTabAt(POSITION_NORMAL_TABS) }.answers { tab }
@@ -34,12 +36,13 @@ class TabLayoutMediatorTest {
         mediator.selectActivePage()
 
         verify { tab.select() }
+        verify { viewPager.setCurrentItem(POSITION_NORMAL_TABS, false) }
         verify { tabsTrayStore.dispatch(TabsTrayAction.PageSelected(Page.positionToPage(POSITION_NORMAL_TABS))) }
     }
 
     @Test
     fun `page to private tab position when mode is also private`() {
-        val mediator = TabLayoutMediator(tabLayout, interactor, modeManager, tabsTrayStore, metrics)
+        val mediator = TabLayoutMediator(tabLayout, viewPager, interactor, modeManager, tabsTrayStore, metrics)
 
         every { modeManager.mode }.answers { BrowsingMode.Private }
         every { tabLayout.getTabAt(POSITION_PRIVATE_TABS) }.answers { tab }
@@ -52,7 +55,7 @@ class TabLayoutMediatorTest {
 
     @Test
     fun `selectTabAtPosition will dispatch the correct TabsTrayStore action`() {
-        val mediator = TabLayoutMediator(tabLayout, interactor, modeManager, tabsTrayStore, metrics)
+        val mediator = TabLayoutMediator(tabLayout, viewPager, interactor, modeManager, tabsTrayStore, metrics)
 
         every { tabLayout.getTabAt(POSITION_NORMAL_TABS) }.answers { tab }
         every { tabLayout.getTabAt(POSITION_PRIVATE_TABS) }.answers { tab }
@@ -73,7 +76,7 @@ class TabLayoutMediatorTest {
 
     @Test
     fun `lifecycle methods adds and removes observer`() {
-        val mediator = TabLayoutMediator(tabLayout, interactor, modeManager, tabsTrayStore, metrics)
+        val mediator = TabLayoutMediator(tabLayout, viewPager, interactor, modeManager, tabsTrayStore, metrics)
 
         every { modeManager.mode }.answers { BrowsingMode.Private }