adding support for horizontal scrolling

app/build.gradle

@@ -32,7 +32,7 @@ android {
 }
 
 dependencies {
-    compile 'com.simplemobiletools:commons:2.21.13'
+    compile 'com.simplemobiletools:commons:2.21.14'
     compile 'com.davemorrissey.labs:subsampling-scale-image-view:3.6.0'
     compile 'com.theartofdev.edmodo:android-image-cropper:2.4.0'
     compile 'com.bignerdranch.android:recyclerview-multiselect:0.2'

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

@@ -213,7 +213,8 @@ class MainActivity : SimpleActivity(), DirectoryAdapter.DirOperationsListener {
     private fun checkIfColorChanged() {
         if (directories_grid.adapter != null && getRecyclerAdapter().foregroundColor != config.primaryColor) {
             getRecyclerAdapter().updatePrimaryColor(config.primaryColor)
-            directories_fastscroller.updateHandleColor()
+            directories_vertical_fastscroller.updateHandleColor()
+            directories_horizontal_fastscroller.updateHandleColor()
         }
     }
 
@@ -395,7 +396,18 @@ class MainActivity : SimpleActivity(), DirectoryAdapter.DirOperationsListener {
                 itemClicked(it.path)
             }
         }
-        directories_fastscroller.setViews(directories_grid, directories_refresh_layout)
+
+        directories_vertical_fastscroller.isHorizontal = false
+        directories_vertical_fastscroller.beGoneIf(config.scrollHorizontally)
+
+        directories_horizontal_fastscroller.isHorizontal = true
+        directories_horizontal_fastscroller.beVisibleIf(config.scrollHorizontally)
+
+        if (config.scrollHorizontally) {
+            directories_horizontal_fastscroller.setViews(directories_grid, directories_refresh_layout)
+        } else {
+            directories_vertical_fastscroller.setViews(directories_grid, directories_refresh_layout)
+        }
     }
 
     private fun checkLastMediaChanged() {

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

@@ -128,7 +128,8 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
     private fun checkIfColorChanged() {
         if (media_grid.adapter != null && getRecyclerAdapter().foregroundColor != config.primaryColor) {
             getRecyclerAdapter().updatePrimaryColor(config.primaryColor)
-            media_fastscroller.updateHandleColor()
+            media_horizontal_fastscroller.updateHandleColor()
+            media_vertical_fastscroller.updateHandleColor()
         }
     }
 
@@ -144,7 +145,18 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
                 itemClicked(it.path)
             }
         }
-        media_fastscroller.setViews(media_grid, media_refresh_layout)
+
+        media_vertical_fastscroller.isHorizontal = false
+        media_vertical_fastscroller.beGoneIf(config.scrollHorizontally)
+
+        media_horizontal_fastscroller.isHorizontal = true
+        media_horizontal_fastscroller.beVisibleIf(config.scrollHorizontally)
+
+        if (config.scrollHorizontally) {
+            media_horizontal_fastscroller.setViews(media_grid, media_refresh_layout)
+        } else {
+            media_vertical_fastscroller.setViews(media_grid, media_refresh_layout)
+        }
     }
 
     private fun checkLastMediaChanged() {

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

@@ -20,13 +20,41 @@
             app:spanCount="@integer/directory_columns_vertical_scroll"/>
 
         <com.simplemobiletools.commons.views.FastScroller
-            android:id="@+id/directories_fastscroller"
+            android:id="@+id/directories_vertical_fastscroller"
             android:layout_width="wrap_content"
             android:layout_height="match_parent"
             android:layout_alignParentEnd="true"
             android:layout_alignParentRight="true"
             android:paddingLeft="@dimen/normal_margin"
-            android:paddingStart="@dimen/normal_margin"/>
+            android:paddingStart="@dimen/normal_margin">
 
+            <ImageView
+                android:id="@+id/fastscroller_handle_vertical"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="end"
+                android:alpha="0"
+                android:background="@drawable/fastscroller_handle_vertical"/>
+
+        </com.simplemobiletools.commons.views.FastScroller>
+
+        <com.simplemobiletools.commons.views.FastScroller
+            android:id="@+id/directories_horizontal_fastscroller"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_alignParentBottom="true"
+            android:layout_alignParentLeft="true"
+            android:layout_alignParentStart="true"
+            android:paddingTop="@dimen/normal_margin">
+
+            <ImageView
+                android:id="@+id/fastscroller_handle_horizontal"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="bottom"
+                android:alpha="0"
+                android:background="@drawable/fastscroller_handle_horizontal"/>
+
+        </com.simplemobiletools.commons.views.FastScroller>
     </RelativeLayout>
 </android.support.v4.widget.SwipeRefreshLayout>

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

@@ -20,13 +20,41 @@
             app:spanCount="@integer/media_columns_vertical_scroll"/>
 
         <com.simplemobiletools.commons.views.FastScroller
-            android:id="@+id/media_fastscroller"
+            android:id="@+id/media_vertical_fastscroller"
             android:layout_width="wrap_content"
             android:layout_height="match_parent"
             android:layout_alignParentEnd="true"
             android:layout_alignParentRight="true"
             android:paddingLeft="@dimen/normal_margin"
-            android:paddingStart="@dimen/normal_margin"/>
+            android:paddingStart="@dimen/normal_margin">
 
+            <ImageView
+                android:id="@+id/fastscroller_handle_vertical"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="end"
+                android:alpha="0"
+                android:background="@drawable/fastscroller_handle_vertical"/>
+
+        </com.simplemobiletools.commons.views.FastScroller>
+
+        <com.simplemobiletools.commons.views.FastScroller
+            android:id="@+id/media_horizontal_fastscroller"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_alignParentBottom="true"
+            android:layout_alignParentLeft="true"
+            android:layout_alignParentStart="true"
+            android:paddingTop="@dimen/normal_margin">
+
+            <ImageView
+                android:id="@+id/fastscroller_handle_horizontal"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="bottom"
+                android:alpha="0"
+                android:background="@drawable/fastscroller_handle_horizontal"/>
+
+        </com.simplemobiletools.commons.views.FastScroller>
     </RelativeLayout>
 </android.support.v4.widget.SwipeRefreshLayout>

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

@@ -214,8 +214,7 @@
             android:layout_height="wrap_content"
             android:layout_marginTop="@dimen/medium_margin"
             android:background="?attr/selectableItemBackground"
-            android:padding="@dimen/activity_margin"
+            android:padding="@dimen/activity_margin">
-            android:visibility="gone">
 
             <com.simplemobiletools.commons.views.MySwitchCompat
                 android:id="@+id/settings_scroll_horizontally"