allow customizing the spacing at file thumbnails

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

@@ -732,7 +732,7 @@ class MediaActivity : SimpleActivity(), MediaOperationsListener {
         val viewType = config.getFolderViewType(if (mShowAll) SHOW_ALL else mPath)
         if (viewType == VIEW_TYPE_GRID) {
             val spanCount = config.mediaColumnCnt
-            val spacing = 2
+            val spacing = config.thumbnailSpacing
             media_grid.addItemDecoration(GridSpacingItemDecoration(spanCount, spacing, config.scrollHorizontally))
         }
     }

app/src/main/kotlin/com/simplemobiletools/gallery/pro/dialogs/ChangeFileThumbnailStyleDialog.kt

@@ -4,14 +4,18 @@ import android.content.DialogInterface
 import android.view.View
 import androidx.appcompat.app.AlertDialog
 import com.simplemobiletools.commons.activities.BaseSimpleActivity
+import com.simplemobiletools.commons.dialogs.RadioGroupDialog
 import com.simplemobiletools.commons.extensions.setupDialogStuff
+import com.simplemobiletools.commons.models.RadioItem
 import com.simplemobiletools.gallery.pro.R
 import com.simplemobiletools.gallery.pro.extensions.config
 import kotlinx.android.synthetic.main.dialog_change_file_thumbnail_style.view.*
+import java.text.DecimalFormat
 
 class ChangeFileThumbnailStyleDialog(val activity: BaseSimpleActivity) : DialogInterface.OnClickListener {
     private var config = activity.config
     private var view: View
+    private var thumbnailSpacing = config.thumbnailSpacing
 
     init {
         view = activity.layoutInflater.inflate(R.layout.dialog_change_file_thumbnail_style, null).apply {
@@ -22,7 +26,24 @@ class ChangeFileThumbnailStyleDialog(val activity: BaseSimpleActivity) : DialogI
             dialog_file_style_animate_gifs_holder.setOnClickListener { dialog_file_style_animate_gifs.toggle() }
             dialog_file_style_show_thumbnail_video_duration_holder.setOnClickListener { dialog_file_style_show_thumbnail_video_duration.toggle() }
             dialog_file_style_show_thumbnail_file_types_holder.setOnClickListener { dialog_file_style_show_thumbnail_file_types.toggle() }
+
+            dialog_file_style_spacing_holder.setOnClickListener {
+                val items = arrayListOf(
+                    RadioItem(0, "0x"),
+                    RadioItem(1, "0.5x"),
+                    RadioItem(2, "1x"),
+                    RadioItem(4, "2x"),
+                    RadioItem(8, "4x"),
+                    RadioItem(16, "8x"),
+                    RadioItem(32, "16x"))
+
+                RadioGroupDialog(activity, items, thumbnailSpacing) {
+                    thumbnailSpacing = it as Int
+                    updateThumbnailSpacingText()
                 }
+            }
+        }
+        updateThumbnailSpacingText()
 
         AlertDialog.Builder(activity)
             .setPositiveButton(R.string.ok, this)
@@ -36,5 +57,12 @@ class ChangeFileThumbnailStyleDialog(val activity: BaseSimpleActivity) : DialogI
         config.animateGifs = view.dialog_file_style_animate_gifs.isChecked
         config.showThumbnailVideoDuration = view.dialog_file_style_show_thumbnail_video_duration.isChecked
         config.showThumbnailFileTypes = view.dialog_file_style_show_thumbnail_file_types.isChecked
+        config.thumbnailSpacing = thumbnailSpacing
+    }
+
+    private fun updateThumbnailSpacingText() {
+        val number = thumbnailSpacing * 0.5
+        val format = DecimalFormat("0.#")
+        view.dialog_file_style_spacing.text = "${format.format(number)}x"
     }
 }

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

@@ -507,4 +507,8 @@ class Config(context: Context) : BaseConfig(context) {
     var limitFolderTitle: Boolean
         get() = prefs.getBoolean(LIMIT_FOLDER_TITLE, false)
         set(limitFolderTitle) = prefs.edit().putBoolean(LIMIT_FOLDER_TITLE, limitFolderTitle).apply()
+
+    var thumbnailSpacing: Int
+        get() = prefs.getInt(THUMBNAIL_SPACING, 2)
+        set(thumbnailSpacing) = prefs.edit().putInt(THUMBNAIL_SPACING, thumbnailSpacing).apply()
 }

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

@@ -86,6 +86,7 @@ const val WERE_FAVORITES_MIGRATED = "were_favorites_migrated"
 const val FOLDER_THUMBNAIL_STYLE = "folder_thumbnail_style"
 const val FOLDER_MEDIA_COUNT = "folder_media_count"
 const val LIMIT_FOLDER_TITLE = "folder_limit_title"
+const val THUMBNAIL_SPACING = "thumbnail_spacing"
 
 // slideshow
 const val SLIDESHOW_INTERVAL = "slideshow_interval"

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

@@ -13,15 +13,46 @@
         android:paddingTop="@dimen/normal_margin">
 
         <RelativeLayout
-            android:id="@+id/dialog_file_style_animate_gifs_holder"
+            android:id="@+id/dialog_file_style_spacing_holder"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_marginTop="@dimen/medium_margin"
             android:background="?attr/selectableItemBackground"
             android:paddingStart="@dimen/normal_margin"
-            android:paddingTop="@dimen/activity_margin"
+            android:paddingTop="@dimen/bigger_margin"
             android:paddingEnd="@dimen/normal_margin"
-            android:paddingBottom="@dimen/activity_margin">
+            android:paddingBottom="@dimen/bigger_margin">
+
+            <com.simplemobiletools.commons.views.MyTextView
+                android:id="@+id/dialog_file_style_spacing_label"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_centerVertical="true"
+                android:layout_toStartOf="@+id/dialog_file_style_spacing"
+                android:ellipsize="end"
+                android:lines="1"
+                android:paddingStart="@dimen/medium_margin"
+                android:paddingEnd="@dimen/medium_margin"
+                android:text="@string/thumbnail_spacing" />
+
+            <com.simplemobiletools.commons.views.MyTextView
+                android:id="@+id/dialog_file_style_spacing"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_alignParentEnd="true"
+                android:layout_marginEnd="@dimen/medium_margin"
+                android:background="@null"
+                android:clickable="false" />
+
+        </RelativeLayout>
+
+        <RelativeLayout
+            android:id="@+id/dialog_file_style_animate_gifs_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/medium_margin"
+            android:background="?attr/selectableItemBackground"
+            android:padding="@dimen/normal_margin">
 
             <com.simplemobiletools.commons.views.MySwitchCompat
                 android:id="@+id/dialog_file_style_animate_gifs"
@@ -41,10 +72,7 @@
             android:layout_height="wrap_content"
             android:layout_marginTop="@dimen/medium_margin"
             android:background="?attr/selectableItemBackground"
-            android:paddingStart="@dimen/normal_margin"
+            android:padding="@dimen/normal_margin">
-            android:paddingTop="@dimen/activity_margin"
-            android:paddingEnd="@dimen/normal_margin"
-            android:paddingBottom="@dimen/activity_margin">
 
             <com.simplemobiletools.commons.views.MySwitchCompat
                 android:id="@+id/dialog_file_style_show_thumbnail_video_duration"
@@ -64,10 +92,7 @@
             android:layout_height="wrap_content"
             android:layout_marginTop="@dimen/medium_margin"
             android:background="?attr/selectableItemBackground"
-            android:paddingStart="@dimen/normal_margin"
+            android:padding="@dimen/normal_margin">
-            android:paddingTop="@dimen/activity_margin"
-            android:paddingEnd="@dimen/normal_margin"
-            android:paddingBottom="@dimen/activity_margin">
 
             <com.simplemobiletools.commons.views.MySwitchCompat
                 android:id="@+id/dialog_file_style_show_thumbnail_file_types"