fix #297, allow one to one pixel ratio zooming with two double taps

app/build.gradle

@@ -78,7 +78,7 @@ dependencies {
 
     //implementation 'com.davemorrissey.labs:subsampling-scale-image-view:3.10.0'
     //implementation 'com.github.tibbi:subsampling-scale-image-view:v3.10.1-fork'
-    implementation 'com.github.tibbi:subsampling-scale-image-view:4.0.2'
+    implementation 'com.github.tibbi:subsampling-scale-image-view:7a000e651e'
 
     // implementation 'com.github.chrisbanes:PhotoView:2.3.0'
     implementation 'com.github.tibbi:PhotoView:2.3.0-fork'

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

@@ -65,6 +65,7 @@ class SettingsActivity : SimpleActivity() {
         setupAllowZoomingImages()
         setupShowHighestQuality()
         setupOneFingerZoom()
+        setupAllowOneToOneZoom()
         setupAllowInstantChange()
         setupShowExtendedDetails()
         setupHideExtendedDetails()
@@ -377,6 +378,7 @@ class SettingsActivity : SimpleActivity() {
     private fun updateDeepZoomToggleButtons() {
         settings_one_finger_zoom_holder.beVisibleIf(config.allowZoomingImages)
         settings_show_highest_quality_holder.beVisibleIf(config.allowZoomingImages)
+        settings_allow_one_to_one_zoom_holder.beVisibleIf(config.allowZoomingImages)
     }
 
     private fun setupShowHighestQuality() {
@@ -395,6 +397,14 @@ class SettingsActivity : SimpleActivity() {
         }
     }
 
+    private fun setupAllowOneToOneZoom() {
+        settings_allow_one_to_one_zoom.isChecked = config.allowOneToOneZoom
+        settings_allow_one_to_one_zoom_holder.setOnClickListener {
+            settings_allow_one_to_one_zoom.toggle()
+            config.allowOneToOneZoom = settings_allow_one_to_one_zoom.isChecked
+        }
+    }
+
     private fun setupAllowInstantChange() {
         settings_allow_instant_change.isChecked = config.allowInstantChange
         settings_allow_instant_change_holder.setOnClickListener {

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

@@ -393,15 +393,17 @@ class PhotoFragment : ViewPagerFragment() {
             override fun make() = PicassoRegionDecoder()
         }
 
+        val config = context!!.config
         view.subsampling_view.apply {
-            setMaxTileSize(if (context!!.config.showHighestQuality) Integer.MAX_VALUE else 4096)
+            setMaxTileSize(if (config.showHighestQuality) Integer.MAX_VALUE else 4096)
-            setMinimumTileDpi(if (context!!.config.showHighestQuality) -1 else getMinTileDpi())
+            setMinimumTileDpi(if (config.showHighestQuality) -1 else getMinTileDpi())
             background = ColorDrawable(Color.TRANSPARENT)
             setBitmapDecoderFactory(bitmapDecoder)
             setRegionDecoderFactory(regionDecoder)
             maxScale = 10f
             beVisible()
-            isQuickScaleEnabled = context.config.oneFingerZoom
+            isQuickScaleEnabled = config.oneFingerZoom
+            isOneToOneZoomEnabled = config.allowOneToOneZoom
             setResetScaleOnSizeChange(false)
             setImage(ImageSource.uri(path))
             setOrientation(rotation)
@@ -411,7 +413,7 @@ class PhotoFragment : ViewPagerFragment() {
                 }
 
                 override fun onReady() {
-                    background = ColorDrawable(if (context.config.blackBackground) Color.BLACK else context.config.backgroundColor)
+                    background = ColorDrawable(if (config.blackBackground) Color.BLACK else config.backgroundColor)
                     val useWidth = if (imageOrientation == ORIENTATION_ROTATE_90 || imageOrientation == ORIENTATION_ROTATE_270) sHeight else sWidth
                     val useHeight = if (imageOrientation == ORIENTATION_ROTATE_90 || imageOrientation == ORIENTATION_ROTATE_270) sWidth else sHeight
                     setDoubleTapZoomScale(getDoubleTapZoomScale(useWidth, useHeight))

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

@@ -441,4 +441,8 @@ class Config(context: Context) : BaseConfig(context) {
     var showWidgetFolderName: Boolean
         get() = prefs.getBoolean(SHOW_WIDGET_FOLDER_NAME, true)
         set(showWidgetFolderName) = prefs.edit().putBoolean(SHOW_WIDGET_FOLDER_NAME, showWidgetFolderName).apply()
+
+    var allowOneToOneZoom: Boolean
+        get() = prefs.getBoolean(ALLOW_ONE_TO_ONE_ZOOM, false)
+        set(allowOneToOneZoom) = prefs.edit().putBoolean(ALLOW_ONE_TO_ONE_ZOOM, allowOneToOneZoom).apply()
 }

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

@@ -74,6 +74,7 @@ const val LAST_EDITOR_CROP_OTHER_ASPECT_RATIO_X = "last_editor_crop_other_aspect
 const val LAST_EDITOR_CROP_OTHER_ASPECT_RATIO_Y = "last_editor_crop_other_aspect_ratio_y"
 const val GROUP_DIRECT_SUBFOLDERS = "group_direct_subfolders"
 const val SHOW_WIDGET_FOLDER_NAME = "show_widget_folder_name"
+const val ALLOW_ONE_TO_ONE_ZOOM = "allow_one_to_one_zoom"
 
 // slideshow
 const val SLIDESHOW_INTERVAL = "slideshow_interval"

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

@@ -795,6 +795,30 @@
 
         </RelativeLayout>
 
+        <RelativeLayout
+            android:id="@+id/settings_allow_one_to_one_zoom_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/medium_margin"
+            android:background="?attr/selectableItemBackground"
+            android:paddingLeft="@dimen/normal_margin"
+            android:paddingTop="@dimen/activity_margin"
+            android:paddingRight="@dimen/normal_margin"
+            android:paddingBottom="@dimen/activity_margin">
+
+            <com.simplemobiletools.commons.views.MySwitchCompat
+                android:id="@+id/settings_allow_one_to_one_zoom"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:background="@null"
+                android:clickable="false"
+                android:paddingStart="@dimen/medium_margin"
+                android:paddingLeft="@dimen/medium_margin"
+                android:text="@string/allow_one_to_one_zoom"
+                app:switchPadding="@dimen/medium_margin"/>
+
+        </RelativeLayout>
+
         <View
             android:id="@+id/extended_details_divider"
             android:layout_width="match_parent"