Bind the margin ratio as a float preference and rename variables

- Fixed the floatListPreference that was used in the SettingsReaderController
- Created new extension for binding float preferences in the ReaderSettingsSheet
- Renamed the ratio variables to include the `webtoon` naming

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceKeys.kt

@@ -51,7 +51,7 @@ object PreferenceKeys {
 
     const val readWithVolumeKeysInverted = "reader_volume_keys_inverted"
 
-    const val webtoonMarginRatio = "margin_ratio"
+    const val marginRatioWebtoon = "margin_ratio_webtoon"
 
     const val portraitColumns = "pref_library_columns_portrait_key"
 

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt

@@ -71,6 +71,8 @@ class PreferencesHelper(val context: Context) {
 
     fun cropBordersWebtoon() = rxPrefs.getBoolean(Keys.cropBordersWebtoon, false)
 
+    fun marginRatioWebtoon() = rxPrefs.getFloat(Keys.marginRatioWebtoon, 0f)
+
     fun readWithTapping() = rxPrefs.getBoolean(Keys.readWithTapping, true)
 
     fun readWithLongTap() = rxPrefs.getBoolean(Keys.readWithLongTap, true)
@@ -79,8 +81,6 @@ class PreferencesHelper(val context: Context) {
 
     fun readWithVolumeKeysInverted() = rxPrefs.getBoolean(Keys.readWithVolumeKeysInverted, false)
 
-    fun marginRatio() = rxPrefs.getInteger(Keys.webtoonMarginRatio, 0)
-
     fun portraitColumns() = rxPrefs.getInteger(Keys.portraitColumns, 0)
 
     fun landscapeColumns() = rxPrefs.getInteger(Keys.landscapeColumns, 0)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderSettingsSheet.kt

@@ -1,6 +1,7 @@
 package eu.kanade.tachiyomi.ui.reader
 
 import android.os.Bundle
+import android.support.annotation.ArrayRes
 import android.support.design.widget.BottomSheetDialog
 import android.support.v4.widget.NestedScrollView
 import android.widget.CompoundButton
@@ -82,7 +83,7 @@ class ReaderSettingsSheet(private val activity: ReaderActivity) : BottomSheetDia
     private fun initWebtoonPreferences() {
         webtoon_prefs_group.visible()
         crop_borders_webtoon.bindToPreference(preferences.cropBordersWebtoon())
-        margin_ratio_webtoon.bindToPreference(preferences.marginRatio())
+        margin_ratio_webtoon.bindToFloatPreference(preferences.marginRatioWebtoon(), R.array.webtoon_margin_ratio_values)
     }
 
     /**
@@ -103,4 +104,17 @@ class ReaderSettingsSheet(private val activity: ReaderActivity) : BottomSheetDia
         setSelection(pref.getOrDefault() - offset, false)
     }
 
+    /**
+     * Binds a spinner to a float preference. The position of the spinner item must
+     * correlate with the [floatValues] resource item (in arrays.xml), which is a <string-array>
+     * of float values that will be parsed here and applied to the preference.
+     */
+    private fun Spinner.bindToFloatPreference(pref: Preference<Float>, @ArrayRes floatValuesResource: Int) {
+        val floatValues = resources.getStringArray(floatValuesResource).map { it.toFloatOrNull() }
+        onItemSelectedListener = IgnoreFirstSpinnerListener { position ->
+            pref.set(floatValues[position])
+        }
+        setSelection(floatValues.indexOf(pref.getOrDefault()), false)
+    }
+
 }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonConfig.kt

@@ -56,22 +56,8 @@ class WebtoonConfig(preferences: PreferencesHelper = Injekt.get()) {
         preferences.readWithVolumeKeysInverted()
             .register({ volumeKeysInverted = it })
 
-        preferences.marginRatio()
-            .register({ marginFromPreference(it) }, { imagePropertyChangedListener?.invoke() })
-    }
-
-    private fun marginFromPreference(position: Int) {
-        marginRatio = when (position) {
-            1 -> PageMargin.TEN_PERCENT
-            2 -> PageMargin.TWENTY_FIVE_PERCENT
-            else -> PageMargin.NO_MARGIN
-        }
-    }
-
-    object PageMargin {
-        const val NO_MARGIN = 0f
-        const val TEN_PERCENT = 0.1f
-        const val TWENTY_FIVE_PERCENT = 0.25f
+        preferences.marginRatioWebtoon()
+            .register({ marginRatio = it }, { imagePropertyChangedListener?.invoke() })
     }
 
     fun unsubscribe() {

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsReaderController.kt

@@ -114,11 +114,12 @@ class SettingsReaderController : SettingsController() {
             }
 
             floatListPreference {
-                key = Keys.webtoonMarginRatio
-                titleRes = R.string.pref_reader_theme
+                key = Keys.marginRatioWebtoon
+                titleRes = R.string.pref_reader_margin
                 entriesRes = arrayOf(R.string.webtoon_margin_ratio_0,
-                        R.string.webtoon_margin_ratio_10, R.string.webtoon_margin_ratio_25)
-                entryValues = arrayOf("0", "1", "2")
+                        R.string.webtoon_margin_ratio_10, R.string.webtoon_margin_ratio_15,
+                        R.string.webtoon_margin_ratio_20, R.string.webtoon_margin_ratio_25)
+                entryValues = arrayOf("0", "0.1", "0.15", "0.2", "0.25")
                 defaultValue = "0"
                 summary = "%s"
             }