Fix seekbar increments, resolves #145 (#147)

* Fix seekbar increments, resolves #145

* Update changelog

4 files changed, 23 insertions, 7 deletions

diff --git a/buildSrc/src/main/groovy/ca/allanwang/kau/Versions.groovy b/buildSrc/src/main/groovy/ca/allanwang/kau/Versions.groovy
index 0e4c29a..448a049 100644
--- a/buildSrc/src/main/groovy/ca/allanwang/kau/Versions.groovy
+++ b/buildSrc/src/main/groovy/ca/allanwang/kau/Versions.groovy
@@ -15,7 +15,7 @@ class Versions {
     static def blurry = '2.1.1'
 
     // https://dl.google.com/dl/android/maven2/com/android/support/constraint/group-index.xml
-    static def constraintLayout = '1.1.0-beta6'
+    static def constraintLayout = '1.1.0'
     static def fastAdapter = '3.2.5'
     static def fastAdapterCommons = fastAdapter
     static def glide = '4.6.1'
@@ -31,7 +31,7 @@ class Versions {
     static def junit = '4.12'
     static def testRunner = '1.0.1'
 
-    static def gradlePlugin = '3.1.0'
+    static def gradlePlugin = '3.1.1'
     static def mavenPlugin = '2.0'
     static def playPublishPlugin = '1.2.0'
     static def dexCountPlugin = '0.8.2'
diff --git a/kpref-activity/src/main/kotlin/ca/allanwang/kau/kpref/activity/items/KPrefSeekbar.kt b/kpref-activity/src/main/kotlin/ca/allanwang/kau/kpref/activity/items/KPrefSeekbar.kt
index a580e83..78f4f80 100644
--- a/kpref-activity/src/main/kotlin/ca/allanwang/kau/kpref/activity/items/KPrefSeekbar.kt
+++ b/kpref-activity/src/main/kotlin/ca/allanwang/kau/kpref/activity/items/KPrefSeekbar.kt
@@ -15,6 +15,15 @@ import ca.allanwang.kau.utils.tint
  */
 open class KPrefSeekbar(val builder: KPrefSeekbarContract) : KPrefItemBase<Int>(builder) {
 
+    protected val min = builder.min
+    protected val max = builder.max
+    protected val increment = builder.increments
+
+    init {
+        if (increment <= 0)
+            throw IllegalArgumentException("Seekbar must increment by at least 1")
+    }
+
     override fun KClick<Int>.defaultOnClick() = Unit
 
     override fun bindView(holder: ViewHolder, payloads: List<Any>) {
@@ -26,8 +35,7 @@ open class KPrefSeekbar(val builder: KPrefSeekbarContract) : KPrefItemBase<Int>(
 
         text.tvc()
         val seekbar = holder.bindLowerView<SeekBar>(R.layout.kau_pref_seekbar) {
-            it.max = builder.max - builder.min
-            it.incrementProgressBy(builder.increments)
+            it.max = (max - min) / increment
             it.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
                 override fun onProgressChanged(sb: SeekBar, progress: Int, fromUser: Boolean) {
                     text.text = builder.toText(progress.fromProgress)
@@ -81,11 +89,18 @@ open class KPrefSeekbar(val builder: KPrefSeekbarContract) : KPrefItemBase<Int>(
         override var textViewConfigs: TextView.() -> Unit = {}
     }
 
+    /**
+     * Helper to convert true value to progress value
+     * Progress values start at 0 and increment by 1
+     */
     protected inline val Int.toProgress: Int
-        get() = this - builder.min
+        get() = (this - min) / increment
 
+    /**
+     * Inverse of [Int.toProgress] to find the true value from the seekbar
+     */
     protected inline val Int.fromProgress: Int
-        get() = this + builder.min
+        get() = this * increment + min
 
     override fun getType(): Int = R.id.kau_item_pref_seekbar
 
diff --git a/sample/src/main/kotlin/ca/allanwang/kau/sample/MainActivity.kt b/sample/src/main/kotlin/ca/allanwang/kau/sample/MainActivity.kt
index b424e91..6cd9776 100644
--- a/sample/src/main/kotlin/ca/allanwang/kau/sample/MainActivity.kt
+++ b/sample/src/main/kotlin/ca/allanwang/kau/sample/MainActivity.kt
@@ -149,6 +149,7 @@ class MainActivity : KPrefActivity() {
 
         seekbar(R.string.seekbar, KPrefSample::seekbar, { KPrefSample.seekbar = it }) {
             descRes = R.string.kau_lorem_ipsum
+            increments = 5
             textViewConfigs = {
                 minEms = 2
             }
diff --git a/sample/src/main/res/xml/kau_changelog.xml b/sample/src/main/res/xml/kau_changelog.xml
index 636525f..a5d0ea9 100644
--- a/sample/src/main/res/xml/kau_changelog.xml
+++ b/sample/src/main/res/xml/kau_changelog.xml
@@ -11,7 +11,7 @@
     <item text="Fix new lint issues (see Migration for resource related methods)" />
     <item text=":adapter: Add more IAdapter functions to help retrieve selections" />
     <item text=":core: Add deprecation warning to bindView for fragment based extensions; use bindViewResettable instead" />
-    <item text="" />
+    <item text=":kpref-activity: Fix seekbar increment" />
     <item text="" />
     <item text="" />