adding a toggle for allowing deep zoomable images

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

@@ -66,6 +66,7 @@ class SettingsActivity : SimpleActivity() {
         setupKeepLastModified()
         setupShowInfoBubble()
         setupEnablePullToRefresh()
+        setupAllowZoomingImages()
         setupOneFingerZoom()
         setupAllowInstantChange()
         setupShowExtendedDetails()
@@ -334,6 +335,16 @@ class SettingsActivity : SimpleActivity() {
         }
     }
 
+    private fun setupAllowZoomingImages() {
+        settings_one_finger_zoom_holder.beVisibleIf(config.allowZoomingImages)
+        settings_allow_zooming_images.isChecked = config.allowZoomingImages
+        settings_allow_zooming_images_holder.setOnClickListener {
+            settings_allow_zooming_images.toggle()
+            config.allowZoomingImages = settings_allow_zooming_images.isChecked
+            settings_one_finger_zoom_holder.beVisibleIf(config.allowZoomingImages)
+        }
+    }
+
     private fun setupOneFingerZoom() {
         settings_one_finger_zoom.isChecked = config.oneFingerZoom
         settings_one_finger_zoom_holder.setOnClickListener {

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

@@ -376,4 +376,8 @@ class Config(context: Context) : BaseConfig(context) {
     var showRecycleBinAtFolders: Boolean
         get() = prefs.getBoolean(SHOW_RECYCLE_BIN_AT_FOLDERS, true)
         set(showRecycleBinAtFolders) = prefs.edit().putBoolean(SHOW_RECYCLE_BIN_AT_FOLDERS, showRecycleBinAtFolders).apply()
+
+    var allowZoomingImages: Boolean
+        get() = prefs.getBoolean(ALLOW_ZOOMING_IMAGES, true)
+        set(allowZoomingImages) = prefs.edit().putBoolean(ALLOW_ZOOMING_IMAGES, allowZoomingImages).apply()
 }

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

@@ -58,6 +58,7 @@ const val USE_RECYCLE_BIN = "use_recycle_bin"
 const val GROUP_BY = "group_by"
 const val EVER_SHOWN_FOLDERS = "ever_shown_folders"
 const val SHOW_RECYCLE_BIN_AT_FOLDERS = "show_recycle_bin_at_folders"
+const val ALLOW_ZOOMING_IMAGES = "allow_zooming_images"
 
 // slideshow
 const val SLIDESHOW_INTERVAL = "slideshow_interval"

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

@@ -596,6 +596,30 @@
 
         </RelativeLayout>
 
+        <RelativeLayout
+            android:id="@+id/settings_allow_zooming_images_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/medium_margin"
+            android:background="?attr/selectableItemBackground"
+            android:paddingBottom="@dimen/activity_margin"
+            android:paddingLeft="@dimen/normal_margin"
+            android:paddingRight="@dimen/normal_margin"
+            android:paddingTop="@dimen/activity_margin">
+
+            <com.simplemobiletools.commons.views.MySwitchCompat
+                android:id="@+id/settings_allow_zooming_images"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:background="@null"
+                android:clickable="false"
+                android:paddingLeft="@dimen/medium_margin"
+                android:paddingStart="@dimen/medium_margin"
+                android:text="@string/allow_deep_zooming_images"
+                app:switchPadding="@dimen/medium_margin"/>
+
+        </RelativeLayout>
+
         <RelativeLayout
             android:id="@+id/settings_one_finger_zoom_holder"
             android:layout_width="match_parent"

build.gradle

@@ -9,7 +9,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.3'
+        classpath 'com.android.tools.build:gradle:3.1.4'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong