Fixes #262: Need full screen functionality and "Entering full screen"

app/src/main/java/org/mozilla/fenix/browser/BrowserFragment.kt

@@ -17,6 +17,8 @@ import androidx.coordinatorlayout.widget.CoordinatorLayout
 import androidx.core.content.ContextCompat
 import androidx.fragment.app.Fragment
 import androidx.navigation.Navigation
+import com.google.android.material.snackbar.Snackbar
+import kotlinx.android.synthetic.main.component_search.*
 import kotlinx.android.synthetic.main.fragment_browser.view.*
 import mozilla.components.browser.toolbar.behavior.BrowserToolbarBottomBehavior
 import mozilla.components.feature.contextmenu.ContextMenuCandidate
@@ -24,11 +26,14 @@ import mozilla.components.feature.contextmenu.ContextMenuFeature
 import mozilla.components.feature.customtabs.CustomTabsToolbarFeature
 import mozilla.components.feature.downloads.DownloadsFeature
 import mozilla.components.feature.prompts.PromptFeature
+import mozilla.components.feature.session.FullScreenFeature
 import mozilla.components.feature.session.SessionFeature
 import mozilla.components.feature.session.SessionUseCases
 import mozilla.components.feature.sitepermissions.SitePermissionsFeature
 import mozilla.components.support.base.feature.BackHandler
 import mozilla.components.support.base.feature.ViewBoundFeatureWrapper
+import mozilla.components.support.ktx.android.view.enterToImmersiveMode
+import mozilla.components.support.ktx.android.view.exitImmersiveModeIfNeeded
 import org.mozilla.fenix.BrowsingModeManager
 import org.mozilla.fenix.DefaultThemeManager
 import org.mozilla.fenix.HomeActivity
@@ -56,6 +61,7 @@ class BrowserFragment : Fragment(), BackHandler {
     private val customTabsToolbarFeature = ViewBoundFeatureWrapper<CustomTabsToolbarFeature>()
     private val toolbarIntegration = ViewBoundFeatureWrapper<ToolbarIntegration>()
     private val sitePermissionsFeature = ViewBoundFeatureWrapper<SitePermissionsFeature>()
+    private val fullScreenFeature = ViewBoundFeatureWrapper<FullScreenFeature>()
     var sessionId: String? = null
 
     override fun onCreateView(
@@ -178,6 +184,26 @@ class BrowserFragment : Fragment(), BackHandler {
             owner = this,
             view = view
         )
+
+        fullScreenFeature.set(
+            feature = FullScreenFeature(
+                sessionManager,
+                SessionUseCases(sessionManager),
+                sessionId
+            ) {
+                if (it) {
+                    Snackbar.make(view.rootView, getString(R.string.full_screen_notification), Snackbar.LENGTH_LONG)
+                        .show()
+                    activity?.enterToImmersiveMode()
+                    toolbar.visibility = View.GONE
+                } else {
+                    activity?.exitImmersiveModeIfNeeded()
+                    toolbar.visibility = View.VISIBLE
+                }
+            },
+            owner = this,
+            view = view
+        )
     }
 
     override fun onResume() {

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

@@ -200,4 +200,5 @@ people before profit. Our mission: keep the Internet open and accessible to all.
     <!-- Text for the button to clear selected history items. The first parameter
         is the number of items you have selected -->
     <string name="history_delete_some">Delete %1$d Items</string>
+    <string name="full_screen_notification">Entering full screen mode</string>
 </resources>