adding a new slideshow option, moving backwards

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

@@ -36,6 +36,10 @@ class SlideshowDialog(val activity: SimpleActivity, val callback: () -> Unit) {
             use_fade_holder.setOnClickListener {
                 use_fade.toggle()
             }
+
+            move_backwards_holder.setOnClickListener {
+                move_backwards.toggle()
+            }
         }
         setupValues()
 
@@ -55,6 +59,7 @@ class SlideshowDialog(val activity: SimpleActivity, val callback: () -> Unit) {
             include_videos.isChecked = config.slideshowIncludeVideos
             random_order.isChecked = config.slideshowRandomOrder
             use_fade.isChecked = config.slideshowUseFade
+            move_backwards.isChecked = config.slideshowMoveBackwards
         }
     }
 
@@ -68,6 +73,7 @@ class SlideshowDialog(val activity: SimpleActivity, val callback: () -> Unit) {
             slideshowIncludeVideos = view.include_videos.isChecked
             slideshowRandomOrder = view.random_order.isChecked
             slideshowUseFade = view.use_fade.isChecked
+            slideshowMoveBackwards = view.move_backwards.isChecked
         }
         dialog.dismiss()
         callback()

app/src/main/kotlin/com/simplemobiletools/gallery/helpers/Config.kt

@@ -248,4 +248,8 @@ class Config(context: Context) : BaseConfig(context) {
     var slideshowUseFade: Boolean
         get() = prefs.getBoolean(SLIDESHOW_USE_FADE, false)
         set(slideshowUseFade) = prefs.edit().putBoolean(SLIDESHOW_USE_FADE, slideshowUseFade).apply()
+
+    var slideshowMoveBackwards: Boolean
+        get() = prefs.getBoolean(SLIDESHOW_MOVE_BACKWARDS, false)
+        set(slideshowMoveBackwards) = prefs.edit().putBoolean(SLIDESHOW_MOVE_BACKWARDS, slideshowMoveBackwards).apply()
 }

app/src/main/kotlin/com/simplemobiletools/gallery/helpers/Constants.kt

@@ -39,6 +39,7 @@ val SLIDESHOW_INTERVAL = "slideshow_interval"
 val SLIDESHOW_INCLUDE_VIDEOS = "slideshow_include_videos"
 val SLIDESHOW_RANDOM_ORDER = "slideshow_random_order"
 val SLIDESHOW_USE_FADE = "slideshow_use_fade"
+val SLIDESHOW_MOVE_BACKWARDS = "slideshow_move_backwards"
 val SLIDESHOW_DEFAULT_INTERVAL = 5
 
 val NOMEDIA = ".nomedia"

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

@@ -99,5 +99,26 @@
                 android:text="@string/use_fade"/>
 
         </RelativeLayout>
+
+        <RelativeLayout
+            android:id="@+id/move_backwards_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_below="@+id/use_fade_holder"
+            android:background="?attr/selectableItemBackground"
+            android:paddingBottom="@dimen/activity_margin"
+            android:paddingLeft="@dimen/medium_margin"
+            android:paddingStart="@dimen/medium_margin"
+            android:paddingTop="@dimen/activity_margin">
+
+            <com.simplemobiletools.commons.views.MySwitchCompat
+                android:id="@+id/move_backwards"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:background="@null"
+                android:clickable="false"
+                android:text="@string/move_backwards"/>
+
+        </RelativeLayout>
     </RelativeLayout>
 </ScrollView>

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

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">Zobrazit skryté média</string>

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

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">Versteckte Ordner zeigen</string>

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

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">Mostrar carpetas ocultas</string>

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

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">Afficher les dossiers cachés</string>

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

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">Show hidden media</string>

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

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">Mostra cartelle nascoste</string>

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

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">非表示フォルダーを表示</string>

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

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">Pokazuj ukryte foldery</string>

app/src/main/res/values-pt-rBR/strings.xml

@@ -86,6 +86,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">Mostrar pastas ocultas</string>

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

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">Mostrar pastas ocultas</string>

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

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">Показать скрытые папки</string>

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

@@ -85,6 +85,7 @@
     <string name="include_videos">Zahrnúť videá</string>
     <string name="random_order">Náhodné poradie</string>
     <string name="use_fade">Používať miznúce animácie</string>
+    <string name="move_backwards">Ísť opačným smerom</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">Zobraziť skryté médiá</string>

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

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">Visa dolda mappar</string>

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

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">Gizli klasörleri göster</string>

app/src/main/res/values-zh-rCN/strings.xml

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">显示所有</string>

app/src/main/res/values-zh-rTW/strings.xml

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">秀出隱藏資料夾</string>

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

@@ -85,6 +85,7 @@
     <string name="include_videos">Include videos</string>
     <string name="random_order">Random order</string>
     <string name="use_fade">Use fade animations</string>
+    <string name="move_backwards">Move backwards</string>
 
     <!-- Settings -->
     <string name="show_hidden_media">Show hidden media</string>