run animation when active step or step size change

Author: saschoar

sequencelayout/build.gradle.kts

@@ -5,17 +5,15 @@ plugins {
     id("com.github.dcendents.android-maven")
 }
 
-group="com.github.transferwise"
-
 android {
     compileSdkVersion(Versions.SDK)
 
     defaultConfig {
         minSdkVersion(Versions.MIN_SDK)
         targetSdkVersion(Versions.SDK)
-        versionCode = 12
-        versionName = "1.1.0"
-        setProperty("archivesBaseName", "com.transferwise.sequencelayout-${versionName}")
+        versionCode = 13
+        versionName = "1.1.1"
+        setProperty("archivesBaseName", "com.transferwise.sequencelayout")
     }
 
     buildTypes {
@@ -35,6 +33,9 @@ android {
     }
 }
 
+group = "com.github.transferwise"
+version = android.defaultConfig.versionName.orEmpty()
+
 dependencies {
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk7:${Versions.KOTLIN}")
     implementation("androidx.appcompat:appcompat:${Versions.ANDROIDX_APPCOMPAT}")

sequencelayout/src/main/java/com/transferwise/sequencelayout/SequenceLayout.kt

@@ -12,7 +12,6 @@ import android.widget.FrameLayout
 import androidx.annotation.ColorInt
 import androidx.annotation.StyleRes
 import androidx.core.view.ViewCompat
-import androidx.core.view.doOnPreDraw
 import kotlinx.android.synthetic.main.sequence_layout.view.*
 
 /**
@@ -38,7 +37,7 @@ import kotlinx.android.synthetic.main.sequence_layout.view.*
  * @see com.transferwise.sequencelayout.SequenceStep
  */
 public class SequenceLayout(context: Context, attrs: AttributeSet?, defStyleAttr: Int)
-    : FrameLayout(context, attrs, defStyleAttr) {
+    : FrameLayout(context, attrs, defStyleAttr), SequenceStep.OnStepChangedListener {
 
     public constructor(context: Context) : this(context, null)
     public constructor(context: Context, attrs: AttributeSet?) : this(context, attrs, 0)
@@ -226,15 +225,17 @@ public class SequenceLayout(context: Context, attrs: AttributeSet?, defStyleAttr
                         resources.getDimensionPixelSize(R.dimen.sequence_active_step_padding_bottom)
                 )
             }
+            child.onStepChangedListener = this
             stepsWrapper.addView(child, params)
-            child.doOnPreDraw {
-                setProgressBarHorizontalOffset()
-                placeDots()
-                removeCallbacks(animateToActive)
-                post(animateToActive)
-            }
             return
         }
         super.addView(child, index, params)
     }
+
+    override fun onStepChanged() {
+        setProgressBarHorizontalOffset()
+        placeDots()
+        removeCallbacks(animateToActive)
+        post(animateToActive)
+    }
 }

sequencelayout/src/main/java/com/transferwise/sequencelayout/SequenceStep.kt

@@ -9,6 +9,7 @@ import android.widget.TextView
 import androidx.annotation.Dimension
 import androidx.annotation.StringRes
 import androidx.annotation.StyleRes
+import androidx.core.view.doOnPreDraw
 import androidx.core.widget.TextViewCompat
 import kotlinx.android.synthetic.main.sequence_step.view.*
 import kotlin.math.max
@@ -50,9 +51,10 @@ public class SequenceStep(context: Context?, attrs: AttributeSet?)
     public constructor(context: Context) : this(context, null)
 
     private var isActive: Boolean = false
+    internal var onStepChangedListener: OnStepChangedListener? = null
 
     init {
-        View.inflate(getContext(), R.layout.sequence_step, this)
+        View.inflate(context, R.layout.sequence_step, this)
 
         clipToPadding = false
         clipChildren = false
@@ -183,10 +185,16 @@ public class SequenceStep(context: Context?, attrs: AttributeSet?)
      */
     public fun setActive(isActive: Boolean) {
         this.isActive = isActive
+        doOnPreDraw { onStepChangedListener?.onStepChanged() }
+    }
+
+    override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
+        super.onSizeChanged(w, h, oldw, oldh)
+        doOnPreDraw { onStepChangedListener?.onStepChanged() }
     }
 
     fun getDotOffset(): Int =
-        (max(getViewHeight(anchor), getViewHeight(title)) - 8.toPx()) / 2 //TODO dynamic dot height
+            (max(getViewHeight(anchor), getViewHeight(title)) - 8.toPx()) / 2 //TODO dynamic dot height
 
     private fun setupAnchor(attributes: TypedArray) {
         if (!attributes.hasValue(R.styleable.SequenceStep_anchor)) {
@@ -255,4 +263,8 @@ public class SequenceStep(context: Context?, attrs: AttributeSet?)
             } else {
                 view.measuredHeight
             }
+
+    internal interface OnStepChangedListener {
+        fun onStepChanged()
+    }
 }