navigation: use global action for home/settings

This really does not feel right...

app/src/main/java/dev/lowrespalmtree/comet/MainActivity.kt

@@ -4,20 +4,37 @@ import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
 import androidx.navigation.fragment.NavHostFragment
 import androidx.navigation.ui.setupWithNavController
-import com.google.android.material.navigation.NavigationView
+import dev.lowrespalmtree.comet.databinding.ActivityMainBinding
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 
 @ExperimentalCoroutinesApi
 class MainActivity : AppCompatActivity() {
+    private lateinit var binding: ActivityMainBinding
+    private var navHost: NavHostFragment? = null
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
+        binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
         Database.init(applicationContext)  // TODO move to App Startup?
 
-        supportFragmentManager.findFragmentById(R.id.nav_host_fragment)?.also { navHost ->
-            findViewById<NavigationView>(R.id.drawer_navigation)?.apply {
-                setupWithNavController((navHost as NavHostFragment).navController)
-            }
-        }
+        navHost = supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment?
+        navHost?.also { binding.drawerNavigation.setupWithNavController(it.navController) }
+    }
+
+    fun goHome() {
+        navHost?.navController?.navigate(R.id.action_global_pageViewFragment)
+        binding.drawerLayout.closeDrawers()
+    }
+
+    fun openHistory() {
+        binding.drawerLayout.closeDrawers()
+        // TODO
+    }
+
+    fun openSettings() {
+        navHost?.navController?.navigate(R.id.action_global_settingsFragment)
+        binding.drawerLayout.closeDrawers()
     }
 }

app/src/main/java/dev/lowrespalmtree/comet/PageViewFragment.kt

@@ -77,7 +77,7 @@ class PageViewFragment : Fragment(), ContentAdapter.ContentAdapterListener {
     private fun onBackPressed() {
         if (visitedUrls.size >= 2) {
             visitedUrls.removeLastOrNull()  // Always remove current page first.
-            openUrl(visitedUrls.removeLastOrNull()!!)
+            visitedUrls.removeLastOrNull()?.also { openUrl(it) }
         }
     }
 

app/src/main/res/layout/activity_main.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.drawerlayout.widget.DrawerLayout
+    android:id="@+id/drawer_layout"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_height="match_parent"

app/src/main/res/menu/drawer.xml

@@ -1,11 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:id="@+id/home"
+        android:icon="@android:drawable/ic_menu_myplaces"
+        android:title="@string/home"
+        android:onClick="goHome" />
     <item
         android:id="@+id/history"
         android:icon="@android:drawable/ic_menu_recent_history"
         android:title="@string/history" />
     <item
-        android:id="@+id/settingsFragment"
+        android:id="@+id/settings"
         android:icon="@android:drawable/ic_menu_preferences"
-        android:title="@string/settings" />
+        android:title="@string/settings"
+        android:onClick="openSettings" />
 </menu>

app/src/main/res/navigation/main.xml

@@ -8,8 +8,22 @@
         android:id="@+id/pageViewFragment"
         android:name="dev.lowrespalmtree.comet.PageViewFragment"
         android:label="PageViewFragment" />
+    <action
+        android:id="@+id/action_global_pageViewFragment"
+        app:destination="@id/pageViewFragment"
+        app:enterAnim="@anim/nav_default_enter_anim"
+        app:exitAnim="@anim/nav_default_exit_anim"
+        app:popEnterAnim="@anim/nav_default_pop_enter_anim"
+        app:popExitAnim="@anim/nav_default_pop_exit_anim" />
     <fragment
         android:id="@+id/settingsFragment"
         android:name="dev.lowrespalmtree.comet.SettingsFragment"
         android:label="SettingsFragment" />
+    <action
+        android:id="@+id/action_global_settingsFragment"
+        app:destination="@id/settingsFragment"
+        app:enterAnim="@anim/nav_default_enter_anim"
+        app:exitAnim="@anim/nav_default_exit_anim"
+        app:popEnterAnim="@anim/nav_default_pop_enter_anim"
+        app:popExitAnim="@anim/nav_default_pop_exit_anim" />
 </navigation>

app/src/main/res/values/strings.xml

@@ -27,6 +27,7 @@
     <string name="attachment_summary_on">Automatically download attachments for incoming emails
     </string>
     <string name="attachment_summary_off">Only download attachments when manually requested</string>
+    <string name="home">Home</string>
 
 
 </resources>