For #14376: Reverse items with bottom toolbar (#14451)

app/src/main/java/org/mozilla/fenix/components/toolbar/TabCounterMenu.kt

@@ -81,20 +81,41 @@ class TabCounterMenu(
     }
 
     @VisibleForTesting
-    internal fun menuItems(showOnly: BrowsingMode?): List<MenuCandidate> {
+    internal fun menuItems(showOnly: BrowsingMode): List<MenuCandidate> {
         return when (showOnly) {
             BrowsingMode.Normal -> listOf(newTabItem)
             BrowsingMode.Private -> listOf(newPrivateTabItem)
-            null -> listOf(
-                newTabItem,
-                newPrivateTabItem,
-                DividerMenuCandidate(),
-                closeTabItem
-            )
         }
     }
 
-    fun updateMenu(showOnly: BrowsingMode? = null) {
+    @VisibleForTesting
+    internal fun menuItems(toolbarPosition: ToolbarPosition): List<MenuCandidate> {
+        val items = listOf(
+            newTabItem,
+            newPrivateTabItem,
+            DividerMenuCandidate(),
+            closeTabItem
+        )
+
+        return when (toolbarPosition) {
+            ToolbarPosition.BOTTOM -> items.reversed()
+            ToolbarPosition.TOP -> items
+        }
+    }
+
+    /**
+     * Update the displayed menu items.
+     * @param showOnly Show only the new tab item corresponding to the given [BrowsingMode].
+     */
+    fun updateMenu(showOnly: BrowsingMode) {
         menuController.submitList(menuItems(showOnly))
     }
+
+    /**
+     * Update the displayed menu items.
+     * @param toolbarPosition Return a list that is ordered based on the given [ToolbarPosition].
+     */
+    fun updateMenu(toolbarPosition: ToolbarPosition) {
+        menuController.submitList(menuItems(toolbarPosition))
+    }
 }

app/src/main/java/org/mozilla/fenix/components/toolbar/TabCounterToolbarButton.kt

@@ -34,6 +34,7 @@ class TabCounterToolbarButton(
     override fun createView(parent: ViewGroup): View {
         val store = parent.context.components.core.store
         val metrics = parent.context.components.analytics.metrics
+        val settings = parent.context.components.settings
 
         store.flowScoped(lifecycleOwner) { flow ->
             flow.map { state -> state.getNormalOrPrivateTabs(isPrivate).size }
@@ -42,7 +43,7 @@ class TabCounterToolbarButton(
         }
 
         val menu = TabCounterMenu(parent.context, metrics, onItemTapped)
-        menu.updateMenu()
+        menu.updateMenu(settings.toolbarPosition)
 
         val view = TabCounter(parent.context).apply {
             reference = WeakReference(this)

app/src/test/java/org/mozilla/fenix/components/toolbar/TabCounterMenuTest.kt

@@ -40,7 +40,7 @@ class TabCounterMenuTest {
 
     @Test
     fun `all items use primary text color styling`() {
-        val items = menu.menuItems(showOnly = null)
+        val items = menu.menuItems(ToolbarPosition.BOTTOM)
         assertEquals(4, items.size)
 
         val textItems = items.mapNotNull { it as? TextMenuCandidate }
@@ -85,7 +85,7 @@ class TabCounterMenuTest {
 
     @Test
     fun `return two new tab items and a close button`() {
-        val (newTab, newPrivateTab, divider, closeTab) = menu.menuItems(showOnly = null)
+        val (newTab, newPrivateTab, divider, closeTab) = menu.menuItems(ToolbarPosition.TOP)
 
         assertEquals("New tab", (newTab as TextMenuCandidate).text)
         assertEquals("New private tab", (newPrivateTab as TextMenuCandidate).text)