make MediaSideScroll extend RelativeLayout

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

@@ -50,7 +50,7 @@ class PhotoFragment : ViewPagerFragment() {
     private var storedHideExtendedDetails = false
     private var storedExtendedDetails = 0
 
-    private lateinit var mediaSideScroll: MediaSideScroll
+    private lateinit var brightnessSideScroll: MediaSideScroll
 
     lateinit var view: ViewGroup
     lateinit var medium: Medium
@@ -66,7 +66,7 @@ class PhotoFragment : ViewPagerFragment() {
             instant_next_item.parentView = container
 
             photo_brightness_controller.setOnTouchListener { v, event ->
-                mediaSideScroll.handleBrightnessTouched(event)
+                brightnessSideScroll.handleBrightnessTouched(event)
                 true
             }
         }
@@ -118,7 +118,8 @@ class PhotoFragment : ViewPagerFragment() {
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
-        mediaSideScroll = MediaSideScroll(activity!!, view.slide_info) {
+        brightnessSideScroll = view.photo_brightness_controller
+        brightnessSideScroll.initialize(activity!!, view.slide_info) {
             view.apply {
                 if (subsampling_view.isVisible()) {
                     subsampling_view.performClick()

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

@@ -54,7 +54,8 @@ class VideoFragment : ViewPagerFragment(), SurfaceHolder.Callback, SeekBar.OnSee
     private var mStoredHideExtendedDetails = false
     private var mStoredExtendedDetails = 0
 
-    private lateinit var mediaSideScroll: MediaSideScroll
+    private lateinit var brightnessSideScroll: MediaSideScroll
+    private lateinit var volumeSideScroll: MediaSideScroll
 
     lateinit var medium: Medium
 
@@ -87,7 +88,13 @@ class VideoFragment : ViewPagerFragment(), SurfaceHolder.Callback, SeekBar.OnSee
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
-        mediaSideScroll = MediaSideScroll(activity!!, view.slide_info) {
+        brightnessSideScroll = view.video_brightness_controller
+        brightnessSideScroll.initialize(activity!!, view.slide_info) {
+            view.video_holder.performClick()
+        }
+
+        volumeSideScroll = view.video_volume_controller
+        volumeSideScroll.initialize(activity!!, view.slide_info) {
             view.video_holder.performClick()
         }
     }
@@ -145,12 +152,12 @@ class VideoFragment : ViewPagerFragment(), SurfaceHolder.Callback, SeekBar.OnSee
         mView!!.video_holder.setOnClickListener { toggleFullscreen() }
 
         mView!!.video_volume_controller.setOnTouchListener { v, event ->
-            mediaSideScroll.handleVolumeTouched(event)
+            volumeSideScroll.handleVolumeTouched(event)
             true
         }
 
         mView!!.video_brightness_controller.setOnTouchListener { v, event ->
-            mediaSideScroll.handleBrightnessTouched(event)
+            volumeSideScroll.handleBrightnessTouched(event)
             true
         }
 

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

@@ -1,16 +1,19 @@
 package com.simplemobiletools.gallery.helpers
 
 import android.app.Activity
+import android.content.Context
 import android.media.AudioManager
 import android.os.Handler
 import android.provider.Settings
+import android.util.AttributeSet
 import android.view.MotionEvent
+import android.widget.RelativeLayout
 import android.widget.TextView
 import com.simplemobiletools.gallery.R
 import com.simplemobiletools.gallery.activities.ViewPagerActivity
 import com.simplemobiletools.gallery.extensions.audioManager
 
-class MediaSideScroll(val activity: Activity, val slideInfoView: TextView, val callback: () -> Unit) {
+class MediaSideScroll(context: Context, attrs: AttributeSet) : RelativeLayout(context, attrs) {
     private val SLIDE_INFO_FADE_DELAY = 1000L
     private var mTouchDownX = 0f
     private var mTouchDownY = 0f
@@ -23,6 +26,16 @@ class MediaSideScroll(val activity: Activity, val slideInfoView: TextView, val c
     private var mSlideInfoText = ""
     private var mSlideInfoFadeHandler = Handler()
 
+    private lateinit var activity: Activity
+    private lateinit var slideInfoView: TextView
+    private lateinit var callback: () -> Unit
+
+    fun initialize(activity: Activity, slideInfoView: TextView, callback: () -> Unit) {
+        this.activity = activity
+        this.slideInfoView = slideInfoView
+        this.callback = callback
+    }
+
     fun handleVolumeTouched(event: MotionEvent) {
         when (event.action) {
             MotionEvent.ACTION_DOWN -> {

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

@@ -31,7 +31,7 @@
         android:visibility="gone"
         tools:text="My image\nAnother line"/>
 
-    <RelativeLayout
+    <com.simplemobiletools.gallery.helpers.MediaSideScroll
         android:id="@+id/photo_brightness_controller"
         android:layout_width="@dimen/media_side_slider_width"
         android:layout_height="match_parent"

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

@@ -13,14 +13,14 @@
         android:layout_centerInParent="true"
         android:background="@android:color/transparent"/>
 
-    <RelativeLayout
+    <com.simplemobiletools.gallery.helpers.MediaSideScroll
         android:id="@+id/video_volume_controller"
         android:layout_width="@dimen/media_side_slider_width"
         android:layout_height="match_parent"
         android:layout_alignParentEnd="true"
         android:layout_alignParentRight="true"/>
 
-    <RelativeLayout
+    <com.simplemobiletools.gallery.helpers.MediaSideScroll
         android:id="@+id/video_brightness_controller"
         android:layout_width="@dimen/media_side_slider_width"
         android:layout_height="match_parent"/>