handle horizontal scrolling at copy/move destination picker too

app/src/main/kotlin/com/simplemobiletools/gallery/dialogs/ChangeSortingDialog.kt

@@ -17,7 +17,7 @@ class ChangeSortingDialog(val activity: SimpleActivity, val isDirectorySorting:
                           val path: String = "", val callback: () -> Unit) :
         DialogInterface.OnClickListener {
     private var currSorting = 0
-    private var config: Config = activity.config
+    private var config = activity.config
     private var view: View
 
     init {

app/src/main/kotlin/com/simplemobiletools/gallery/dialogs/PickDirectoryDialog.kt

@@ -1,9 +1,12 @@
 package com.simplemobiletools.gallery.dialogs
 
 import android.support.v7.app.AlertDialog
-import android.support.v7.widget.RecyclerView
+import android.support.v7.widget.GridLayoutManager
 import android.view.LayoutInflater
+import android.view.View
 import com.simplemobiletools.commons.dialogs.FilePickerDialog
+import com.simplemobiletools.commons.extensions.beGoneIf
+import com.simplemobiletools.commons.extensions.beVisibleIf
 import com.simplemobiletools.commons.extensions.setupDialogStuff
 import com.simplemobiletools.commons.extensions.toast
 import com.simplemobiletools.gallery.R
@@ -17,12 +20,15 @@ import kotlinx.android.synthetic.main.dialog_directory_picker.view.*
 
 class PickDirectoryDialog(val activity: SimpleActivity, val sourcePath: String, val callback: (path: String) -> Unit) {
     var dialog: AlertDialog
-    var directoriesGrid: RecyclerView
     var shownDirectories: ArrayList<Directory> = ArrayList()
+    var view: View
 
     init {
-        val view = LayoutInflater.from(activity).inflate(R.layout.dialog_directory_picker, null)
+        view = LayoutInflater.from(activity).inflate(R.layout.dialog_directory_picker, null)
-        directoriesGrid = view.directories_grid
+        (view.directories_grid.layoutManager as GridLayoutManager).apply {
+            orientation = if (activity.config.scrollHorizontally) GridLayoutManager.HORIZONTAL else GridLayoutManager.VERTICAL
+            spanCount = activity.config.dirColumnCnt
+        }
 
         dialog = AlertDialog.Builder(activity)
                 .setPositiveButton(R.string.ok, null)
@@ -63,6 +69,22 @@ class PickDirectoryDialog(val activity: SimpleActivity, val sourcePath: String,
                 dialog.dismiss()
             }
         }
-        directoriesGrid.adapter = adapter
+
+        val scrollHorizontally = activity.config.scrollHorizontally
+        view.apply {
+            directories_grid.adapter = adapter
+
+            directories_vertical_fastscroller.isHorizontal = false
+            directories_vertical_fastscroller.beGoneIf(scrollHorizontally)
+
+            directories_horizontal_fastscroller.isHorizontal = true
+            directories_horizontal_fastscroller.beVisibleIf(scrollHorizontally)
+
+            if (scrollHorizontally) {
+                directories_horizontal_fastscroller.setViews(directories_grid)
+            } else {
+                directories_vertical_fastscroller.setViews(directories_grid)
+            }
+        }
     }
 }

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

@@ -1,10 +1,54 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.v7.widget.RecyclerView
+<RelativeLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/directories_grid_holder"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <com.simplemobiletools.commons.views.MyScalableRecyclerView
         android:id="@+id/directories_grid"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-    android:paddingTop="@dimen/activity_margin"
+        android:scrollbars="none"
         app:layoutManager="android.support.v7.widget.GridLayoutManager"
         app:spanCount="@integer/directory_columns_vertical_scroll"/>
+
+    <com.simplemobiletools.commons.views.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">
+
+        <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>