add some bottom shadow to fullscreen photos when Bottom Actions are enabled

app/src/main/kotlin/com/simplemobiletools/gallery/activities/ViewPagerActivity.kt

@@ -80,7 +80,6 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_medium)
-        setTranslucentNavigation()
         mMediaFiles = MediaActivity.mMedia.clone() as ArrayList<Medium>
 
         handlePermission(PERMISSION_WRITE_STORAGE) {
@@ -95,6 +94,7 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
         storeStateVariables()
     }
 
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     override fun onResume() {
         super.onResume()
         if (!hasPermission(PERMISSION_WRITE_STORAGE)) {
@@ -102,6 +102,14 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
             return
         }
 
+        if (config.bottomActions) {
+            if (isLollipopPlus()) {
+                window.navigationBarColor = Color.TRANSPARENT
+            }
+        } else {
+            setTranslucentNavigation()
+        }
+
         if (mStoredReplaceZoomableImages != config.replaceZoomableImages) {
             mPrevHashcode = 0
             refreshViewPager()

app/src/main/kotlin/com/simplemobiletools/gallery/fragments/PhotoFragment.kt

@@ -51,6 +51,7 @@ class PhotoFragment : ViewPagerFragment() {
 
     private var storedShowExtendedDetails = false
     private var storedHideExtendedDetails = false
+    private var storedBottomActions = false
     private var storedExtendedDetails = 0
 
     lateinit var view: ViewGroup
@@ -116,7 +117,8 @@ class PhotoFragment : ViewPagerFragment() {
 
         isFullscreen = activity!!.window.decorView.systemUiVisibility and View.SYSTEM_UI_FLAG_FULLSCREEN == View.SYSTEM_UI_FLAG_FULLSCREEN
         loadImage()
-        checkExtendedDetails()
+        initExtendedDetails()
+        initBottomActions()
         wasInit = true
 
         return view
@@ -130,7 +132,11 @@ class PhotoFragment : ViewPagerFragment() {
     override fun onResume() {
         super.onResume()
         if (wasInit && (context!!.config.showExtendedDetails != storedShowExtendedDetails || context!!.config.extendedDetails != storedExtendedDetails)) {
-            checkExtendedDetails()
+            initExtendedDetails()
+        }
+
+        if (wasInit && (context!!.config.bottomActions != storedBottomActions)) {
+            initBottomActions()
         }
 
         val allowPhotoGestures = context!!.config.allowPhotoGestures
@@ -162,6 +168,7 @@ class PhotoFragment : ViewPagerFragment() {
             storedShowExtendedDetails = showExtendedDetails
             storedHideExtendedDetails = hideExtendedDetails
             storedExtendedDetails = extendedDetails
+            storedBottomActions = bottomActions
         }
     }
 
@@ -376,7 +383,7 @@ class PhotoFragment : ViewPagerFragment() {
         loadBitmap(degrees)
     }
 
-    private fun checkExtendedDetails() {
+    private fun initExtendedDetails() {
         if (context!!.config.showExtendedDetails) {
             view.photo_details.apply {
                 beInvisible()   // make it invisible so we can measure it, but not show yet
@@ -397,6 +404,14 @@ class PhotoFragment : ViewPagerFragment() {
         }
     }
 
+    private fun initBottomActions() {
+        if (context!!.config.bottomActions) {
+            view.bottom_actions.beVisible()
+        } else {
+            view.bottom_actions.beGone()
+        }
+    }
+
     override fun onDestroyView() {
         super.onDestroyView()
         if (activity?.isActivityDestroyed() == false) {
@@ -408,7 +423,8 @@ class PhotoFragment : ViewPagerFragment() {
     override fun onConfigurationChanged(newConfig: Configuration) {
         super.onConfigurationChanged(newConfig)
         loadImage()
-        checkExtendedDetails()
+        initExtendedDetails()
+        initBottomActions()
     }
 
     private fun photoClicked() {
@@ -426,6 +442,10 @@ class PhotoFragment : ViewPagerFragment() {
                 }
             }
         }
+
+        if (storedBottomActions) {
+            view.bottom_actions.animate().alpha(if (isFullscreen) 0f else 1f).start()
+        }
     }
 
     private fun getExtendedDetailsY(height: Int): Float {

app/src/main/res/drawable/gradient_background_lighter.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <gradient
+        android:angle="90"
+        android:endColor="@android:color/transparent"
+        android:startColor="@color/circle_black_background"/>
+</shape>

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

@@ -68,4 +68,14 @@
         android:layout_alignParentEnd="true"
         android:layout_alignParentRight="true"/>
 
+    <LinearLayout
+        android:id="@+id/bottom_actions"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_alignParentBottom="true"
+        android:background="@drawable/gradient_background_lighter"
+        android:minHeight="@dimen/bottom_actions_height"
+        android:orientation="horizontal">
+
+    </LinearLayout>
 </RelativeLayout>

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

@@ -10,4 +10,5 @@
     <dimen name="media_side_slider_width">60dp</dimen>
     <dimen name="instant_change_bar_width">30dp</dimen>
     <dimen name="list_view_folder_thumbnail_size">72dp</dimen>
+    <dimen name="bottom_actions_height">110dp</dimen>
 </resources>