Major update to core and kotterknife; create mediapicker (#15)

* Readme

* Fix kau direction bits

* Truly support transparent ripples

* Update changelog

* Test rect as base

* Replace fab transition with generic fade scale transition

* Add scalexy func

* Add scaleXY

* Add arguments to fadeScaleTransition

* Clean up ink indicator

* Create setOnSingleTapListener

* Fix lint and add rndColor

* Create kotterknife resettables

* Add readme and missing object

* Create lazy resettable registered

* Update core docs

* Opt for separate class for resettable registry

* Clean up resettable registry

* Rename functions

* Add ripple callback listener

* Adjust kprefactivity desc color

* Add more transitions

* Add delete keys option

* Add instrumentation tests

* switch id

* Revert automatic instrumental tests

* Generify imagepickercore and prepare video alternative

* Create working video picker

* Address possible null issue

* Update searchview

* Make layouts public

* Add changelog test

* Update logo link

* Add custom color gif

12 files changed, 356 insertions, 98 deletions

diff --git a/core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyResettable.kt b/core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyResettable.kt
index 2981dda..701cb07 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyResettable.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyResettable.kt
@@ -13,7 +13,7 @@ internal object UNINITIALIZED
 
 fun <T : Any> lazyResettable(initializer: () -> T): LazyResettable<T> = LazyResettable<T>(initializer)
 
-class LazyResettable<T : Any>(private val initializer: () -> T, lock: Any? = null) : ILazyResettable<T>, Serializable {
+open class LazyResettable<T : Any>(private val initializer: () -> T, lock: Any? = null) : ILazyResettable<T>, Serializable {
     @Volatile private var _value: Any = UNINITIALIZED
     private val lock = lock ?: this
 
@@ -52,4 +52,32 @@ class LazyResettable<T : Any>(private val initializer: () -> T, lock: Any? = nul
 
 interface ILazyResettable<T> : Lazy<T> {
     fun invalidate()
+}
+
+interface ILazyResettableRegistry {
+    fun <T : Any> lazy(initializer: () -> T): LazyResettable<T>
+    fun <T : Any> add(resettable: LazyResettable<T>): LazyResettable<T>
+    fun invalidateAll()
+    fun clear()
+}
+
+/**
+ * The following below is a helper class that registers all resettables into a weakly held list
+ * All resettables can therefore be invalidated at once
+ */
+class LazyResettableRegistry : ILazyResettableRegistry {
+
+    var lazyRegistry: MutableList<LazyResettable<*>> = mutableListOf()
+
+    override fun <T : Any> lazy(initializer: () -> T): LazyResettable<T>
+            = add(lazyResettable(initializer))
+
+    override fun <T : Any> add(resettable: LazyResettable<T>): LazyResettable<T> {
+        lazyRegistry.add(resettable)
+        return resettable
+    }
+
+    override fun invalidateAll() = lazyRegistry.forEach { it.invalidate() }
+
+    override fun clear() = lazyRegistry.clear()
 }
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/KPref.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPref.kt
index fa6c5a9..c1ce282 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/kpref/KPref.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPref.kt
@@ -6,6 +6,19 @@ import ca.allanwang.kau.kotlin.ILazyResettable
 
 /**
  * Created by Allan Wang on 2017-06-07.
+ *
+ * Base class for shared preferences
+ * All objects extending this class must be called in
+ * the app's [android.app.Application] class
+ *
+ * See the [KPref.kpref] extensions for more details
+ *
+ * Furthermore, all kprefs are held in the [prefMap],
+ * so if you wish to reset a preference, you must also invalidate the kpref
+ * from that map
+ *
+ * You may optionally override [deleteKeys]. This will be called on initialization
+ * And delete all keys returned from that method
  */
 open class KPref {
 
@@ -18,6 +31,12 @@ open class KPref {
         initialized = true
         this.c = c.applicationContext
         PREFERENCE_NAME = preferenceName
+        val toDelete = deleteKeys()
+        if (toDelete.isNotEmpty()) {
+            val edit = sp.edit()
+            toDelete.forEach { edit.remove(it) }
+            edit.apply()
+        }
     }
 
     internal val sp: SharedPreferences by lazy {
@@ -33,4 +52,6 @@ open class KPref {
 
     operator fun get(key: String): ILazyResettable<*>? = prefMap[key]
 
+    open fun deleteKeys(): Array<String> = arrayOf()
+
 }
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefDelegate.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefDelegate.kt
index f742078..8a582d8 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefDelegate.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefDelegate.kt
@@ -2,7 +2,6 @@ package ca.allanwang.kau.kpref
 
 import ca.allanwang.kau.kotlin.ILazyResettable
 
-object UNINITIALIZED
 
 fun KPref.kpref(key: String, fallback: Boolean, postSetter: (value: Boolean) -> Unit = {}) = KPrefDelegate(key, fallback, this, postSetter)
 fun KPref.kpref(key: String, fallback: Double, postSetter: (value: Float) -> Unit = {}) = KPrefDelegate(key, fallback.toFloat(), this, postSetter)
@@ -25,6 +24,8 @@ class KPrefDelegate<T : Any> internal constructor(
         private val key: String, private val fallback: T, private val pref: KPref, var postSetter: (value: T) -> Unit = {}, lock: Any? = null
 ) : ILazyResettable<T>, java.io.Serializable {
 
+    private object UNINITIALIZED
+
     @Volatile private var _value: Any = UNINITIALIZED
     private val lock = lock ?: this
 
diff --git a/core/src/main/kotlin/ca/allanwang/kau/ui/views/RippleCanvas.kt b/core/src/main/kotlin/ca/allanwang/kau/ui/views/RippleCanvas.kt
index 773490c..f587e60 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/ui/views/RippleCanvas.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/ui/views/RippleCanvas.kt
@@ -1,14 +1,13 @@
 package ca.allanwang.kau.ui.views
 
+import android.animation.Animator
+import android.animation.AnimatorListenerAdapter
 import android.animation.ArgbEvaluator
 import android.animation.ValueAnimator
 import android.content.Context
-import android.graphics.Canvas
-import android.graphics.Color
-import android.graphics.Paint
+import android.graphics.*
 import android.util.AttributeSet
 import android.view.View
-import ca.allanwang.kau.utils.adjustAlpha
 
 /**
  * Created by Allan Wang on 2016-11-17.
@@ -21,63 +20,45 @@ import ca.allanwang.kau.utils.adjustAlpha
 class RippleCanvas @JvmOverloads constructor(
         context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
 ) : View(context, attrs, defStyleAttr) {
-    private val paint: Paint = Paint()
+    private val paint: Paint = Paint().apply {
+        isAntiAlias = true
+        style = Paint.Style.FILL
+    }
+    private val eraser: Paint = Paint().apply {
+        style = Paint.Style.FILL
+        xfermode = PorterDuffXfermode(PorterDuff.Mode.CLEAR)
+    }
     private var baseColor = Color.TRANSPARENT
     private val ripples: MutableList<Ripple> = mutableListOf()
 
-    init {
-        paint.isAntiAlias = true
-        paint.style = Paint.Style.FILL
-    }
-
     /**
-     * Drawing the ripples involves having access to the next layer if it exists,
-     * and using its values to decide on the current color.
-     * If the next layer requests a fade, we will adjust the alpha of our current layer before drawing.
-     * Otherwise we will just draw the color as intended
+     * Draw ripples one at a time in the order given
+     * To support transparent ripples, we simply erase the overlapping base before adding a new circle
      */
     override fun onDraw(canvas: Canvas) {
-        val itr = ripples.listIterator()
-        if (!itr.hasNext()) return canvas.drawColor(baseColor)
-        var next = itr.next()
-        canvas.drawColor(colorToDraw(baseColor, next.fade, next.radius, next.maxRadius))
-        var last = false
-        while (!last) {
-            val current = next
-            if (itr.hasNext()) next = itr.next()
-            else last = true
-            //We may fade any layer except for the last one
-            paint.color = colorToDraw(current.color, next.fade && !last, next.radius, next.maxRadius)
-            canvas.drawCircle(current.x, current.y, current.radius, paint)
-            if (current.radius == current.maxRadius) {
-                if (!last) {
-                    itr.previous()
-                    itr.remove()
-                    itr.next()
-                } else {
-                    itr.remove()
-                }
-                baseColor = current.color
+        paint.color = baseColor
+        canvas.drawRect(0f, 0f, canvas.width.toFloat(), canvas.height.toFloat(), paint)
+        val itr = ripples.iterator()
+        while (itr.hasNext()) {
+            val r = itr.next()
+            paint.color = r.color
+            canvas.drawCircle(r.x, r.y, r.radius, eraser)
+            canvas.drawCircle(r.x, r.y, r.radius, paint)
+            if (r.radius == r.maxRadius) {
+                itr.remove()
+                baseColor = r.color
             }
         }
     }
 
     /**
-     * Given our current color and next layer's radius & max,
-     * we will decide on the alpha of our current layer
-     */
-    internal fun colorToDraw(color: Int, fade: Boolean, current: Float, goal: Float): Int {
-        if (!fade || (current / goal <= FADE_PIVOT)) return color
-        val factor = (goal - current) / (goal - FADE_PIVOT * goal)
-        return color.adjustAlpha(factor)
-    }
-
-    /**
      * Creates a ripple effect from the given starting values
-     * [fade] will gradually transition previous ripples to a transparent color so the resulting background is what we want
-     * this is typically only necessary if the ripple color has transparency
      */
-    fun ripple(color: Int, startX: Float = 0f, startY: Float = 0f, duration: Long = 600L, fade: Boolean = Color.alpha(color) != 255) {
+    fun ripple(color: Int,
+               startX: Float = 0f,
+               startY: Float = 0f,
+               duration: Long = 600L,
+               callback: (() -> Unit)? = null) {
         val w = width.toFloat()
         val h = height.toFloat()
         val x = when (startX) {
@@ -91,7 +72,7 @@ class RippleCanvas @JvmOverloads constructor(
             else -> startY
         }
         val maxRadius = Math.hypot(Math.max(x, w - x).toDouble(), Math.max(y, h - y).toDouble()).toFloat()
-        val ripple = Ripple(color, x, y, 0f, maxRadius, fade)
+        val ripple = Ripple(color, x, y, 0f, maxRadius)
         ripples.add(ripple)
         val animator = ValueAnimator.ofFloat(0f, maxRadius)
         animator.duration = duration
@@ -99,6 +80,11 @@ class RippleCanvas @JvmOverloads constructor(
             ripple.radius = animation.animatedValue as Float
             invalidate()
         }
+        if (callback != null)
+            animator.addListener(object : AnimatorListenerAdapter() {
+                override fun onAnimationCancel(animation: Animator?) = callback()
+                override fun onAnimationEnd(animation: Animator?)  = callback()
+            })
         animator.start()
     }
 
@@ -111,6 +97,8 @@ class RippleCanvas @JvmOverloads constructor(
         invalidate()
     }
 
+    override fun setBackgroundColor(color: Int) = set(color)
+
     /**
      * Sets a color directly but with a transition
      */
@@ -129,12 +117,10 @@ class RippleCanvas @JvmOverloads constructor(
                           val x: Float,
                           val y: Float,
                           var radius: Float,
-                          val maxRadius: Float,
-                          val fade: Boolean)
+                          val maxRadius: Float)
 
     companion object {
         const val MIDDLE = -1.0f
         const val END = -2.0f
-        const val FADE_PIVOT = 0.5f
     }
 }
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/AnimUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/AnimUtils.kt
index 112c8ec..5da21bb 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/utils/AnimUtils.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/AnimUtils.kt
@@ -6,6 +6,7 @@ import android.annotation.SuppressLint
 import android.support.annotation.StringRes
 import android.view.View
 import android.view.ViewAnimationUtils
+import android.view.ViewPropertyAnimator
 import android.view.animation.Animation
 import android.view.animation.AnimationUtils
 import android.widget.TextView
@@ -123,4 +124,6 @@ import android.widget.TextView
     })
 }
 
-@KauUtils fun TextView.setTextWithFade(@StringRes textId: Int, duration: Long = 200, onFinish: (() -> Unit)? = null) = setTextWithFade(context.getString(textId), duration, onFinish)
\ No newline at end of file
+@KauUtils fun TextView.setTextWithFade(@StringRes textId: Int, duration: Long = 200, onFinish: (() -> Unit)? = null) = setTextWithFade(context.getString(textId), duration, onFinish)
+
+@KauUtils inline fun ViewPropertyAnimator.scaleXY(value: Float) = scaleX(value).scaleY(value)
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/ColorUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/ColorUtils.kt
index 50d117c..8537185 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/utils/ColorUtils.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/ColorUtils.kt
@@ -15,10 +15,25 @@ import android.support.v7.widget.AppCompatEditText
 import android.support.v7.widget.Toolbar
 import android.widget.*
 import com.afollestad.materialdialogs.R
+import java.util.*
 
 /**
  * Created by Allan Wang on 2017-06-08.
  */
+
+/**
+ * Generates a random opaque color
+ * Note that this is mainly for testing
+ * Should you require this method often, consider
+ * rewriting the method and storing the [Random] instance
+ * rather than generating one each time
+ */
+inline val rndColor: Int
+    get() {
+        val rnd = Random()
+        return Color.rgb(rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256))
+    }
+
 inline val Int.isColorDark: Boolean
     get() = isColorDark(0.5f)
 
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/Const.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/Const.kt
index f267a60..3e90926 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/utils/Const.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/Const.kt
@@ -9,6 +9,6 @@ const val KAU_LEFT = 1
 const val KAU_TOP = 2
 const val KAU_RIGHT = 4
 const val KAU_BOTTOM = 8
-const val KAU_HORIZONTAL = KAU_LEFT and KAU_RIGHT
-const val KAU_VERTICAL = KAU_TOP and KAU_BOTTOM
-const val KAU_ALL = KAU_HORIZONTAL and KAU_VERTICAL
\ No newline at end of file
+const val KAU_HORIZONTAL = KAU_LEFT or KAU_RIGHT
+const val KAU_VERTICAL = KAU_TOP or KAU_BOTTOM
+const val KAU_ALL = KAU_HORIZONTAL or KAU_VERTICAL
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/Kotterknife.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/Kotterknife.kt
index 3783931..f3c08bd 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/utils/Kotterknife.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/Kotterknife.kt
@@ -1,3 +1,5 @@
+@file:Suppress("UNCHECKED_CAST")
+
 package ca.allanwang.kau.utils
 
 /**
@@ -13,6 +15,7 @@ import android.app.DialogFragment
 import android.app.Fragment
 import android.support.v7.widget.RecyclerView.ViewHolder
 import android.view.View
+import java.util.*
 import kotlin.properties.ReadOnlyProperty
 import kotlin.reflect.KProperty
 import android.support.v4.app.DialogFragment as SupportDialogFragment
@@ -30,13 +33,13 @@ fun <V : View> Dialog.bindView(id: Int)
 fun <V : View> DialogFragment.bindView(id: Int)
         : ReadOnlyProperty<DialogFragment, V> = required(id, viewFinder)
 
-fun <V : View> android.support.v4.app.DialogFragment.bindView(id: Int)
+fun <V : View> SupportDialogFragment.bindView(id: Int)
         : ReadOnlyProperty<android.support.v4.app.DialogFragment, V> = required(id, viewFinder)
 
 fun <V : View> Fragment.bindView(id: Int)
         : ReadOnlyProperty<Fragment, V> = required(id, viewFinder)
 
-fun <V : View> android.support.v4.app.Fragment.bindView(id: Int)
+fun <V : View> SupportFragment.bindView(id: Int)
         : ReadOnlyProperty<android.support.v4.app.Fragment, V> = required(id, viewFinder)
 
 fun <V : View> ViewHolder.bindView(id: Int)
@@ -54,13 +57,13 @@ fun <V : View> Dialog.bindOptionalView(id: Int)
 fun <V : View> DialogFragment.bindOptionalView(id: Int)
         : ReadOnlyProperty<DialogFragment, V?> = optional(id, viewFinder)
 
-fun <V : View> android.support.v4.app.DialogFragment.bindOptionalView(id: Int)
+fun <V : View> SupportDialogFragment.bindOptionalView(id: Int)
         : ReadOnlyProperty<android.support.v4.app.DialogFragment, V?> = optional(id, viewFinder)
 
 fun <V : View> Fragment.bindOptionalView(id: Int)
         : ReadOnlyProperty<Fragment, V?> = optional(id, viewFinder)
 
-fun <V : View> android.support.v4.app.Fragment.bindOptionalView(id: Int)
+fun <V : View> SupportFragment.bindOptionalView(id: Int)
         : ReadOnlyProperty<android.support.v4.app.Fragment, V?> = optional(id, viewFinder)
 
 fun <V : View> ViewHolder.bindOptionalView(id: Int)
@@ -78,13 +81,13 @@ fun <V : View> Dialog.bindViews(vararg ids: Int)
 fun <V : View> DialogFragment.bindViews(vararg ids: Int)
         : ReadOnlyProperty<DialogFragment, List<V>> = required(ids, viewFinder)
 
-fun <V : View> android.support.v4.app.DialogFragment.bindViews(vararg ids: Int)
+fun <V : View> SupportDialogFragment.bindViews(vararg ids: Int)
         : ReadOnlyProperty<android.support.v4.app.DialogFragment, List<V>> = required(ids, viewFinder)
 
 fun <V : View> Fragment.bindViews(vararg ids: Int)
         : ReadOnlyProperty<Fragment, List<V>> = required(ids, viewFinder)
 
-fun <V : View> android.support.v4.app.Fragment.bindViews(vararg ids: Int)
+fun <V : View> SupportFragment.bindViews(vararg ids: Int)
         : ReadOnlyProperty<android.support.v4.app.Fragment, List<V>> = required(ids, viewFinder)
 
 fun <V : View> ViewHolder.bindViews(vararg ids: Int)
@@ -102,13 +105,13 @@ fun <V : View> Dialog.bindOptionalViews(vararg ids: Int)
 fun <V : View> DialogFragment.bindOptionalViews(vararg ids: Int)
         : ReadOnlyProperty<DialogFragment, List<V>> = optional(ids, viewFinder)
 
-fun <V : View> android.support.v4.app.DialogFragment.bindOptionalViews(vararg ids: Int)
+fun <V : View> SupportDialogFragment.bindOptionalViews(vararg ids: Int)
         : ReadOnlyProperty<android.support.v4.app.DialogFragment, List<V>> = optional(ids, viewFinder)
 
 fun <V : View> Fragment.bindOptionalViews(vararg ids: Int)
         : ReadOnlyProperty<Fragment, List<V>> = optional(ids, viewFinder)
 
-fun <V : View> android.support.v4.app.Fragment.bindOptionalViews(vararg ids: Int)
+fun <V : View> SupportFragment.bindOptionalViews(vararg ids: Int)
         : ReadOnlyProperty<android.support.v4.app.Fragment, List<V>> = optional(ids, viewFinder)
 
 fun <V : View> ViewHolder.bindOptionalViews(vararg ids: Int)
@@ -122,11 +125,11 @@ private inline val Dialog.viewFinder: Dialog.(Int) -> View?
     get() = { findViewById(it) }
 private inline val DialogFragment.viewFinder: DialogFragment.(Int) -> View?
     get() = { dialog.findViewById(it) }
-private inline val android.support.v4.app.DialogFragment.viewFinder: android.support.v4.app.DialogFragment.(Int) -> View?
+private inline val SupportDialogFragment.viewFinder: SupportDialogFragment.(Int) -> View?
     get() = { dialog.findViewById(it) }
 private inline val Fragment.viewFinder: Fragment.(Int) -> View?
     get() = { view.findViewById(it) }
-private inline val android.support.v4.app.Fragment.viewFinder: android.support.v4.app.Fragment.(Int) -> View?
+private inline val SupportFragment.viewFinder: SupportFragment.(Int) -> View?
     get() = { view!!.findViewById(it) }
 private inline val ViewHolder.viewFinder: ViewHolder.(Int) -> View?
     get() = { itemView.findViewById(it) }
@@ -134,33 +137,173 @@ private inline val ViewHolder.viewFinder: ViewHolder.(Int) -> View?
 private fun viewNotFound(id: Int, desc: KProperty<*>): Nothing =
         throw IllegalStateException("View ID $id for '${desc.name}' not found.")
 
-@Suppress("UNCHECKED_CAST")
 private fun <T, V : View> required(id: Int, finder: T.(Int) -> View?)
         = Lazy { t: T, desc -> (t.finder(id) as V?)?.apply { } ?: viewNotFound(id, desc) }
 
-@Suppress("UNCHECKED_CAST")
 private fun <T, V : View> optional(id: Int, finder: T.(Int) -> View?)
         = Lazy { t: T, _ -> t.finder(id) as V? }
 
-@Suppress("UNCHECKED_CAST")
 private fun <T, V : View> required(ids: IntArray, finder: T.(Int) -> View?)
         = Lazy { t: T, desc -> ids.map { t.finder(it) as V? ?: viewNotFound(it, desc) } }
 
-@Suppress("UNCHECKED_CAST")
 private fun <T, V : View> optional(ids: IntArray, finder: T.(Int) -> View?)
         = Lazy { t: T, _ -> ids.map { t.finder(it) as V? }.filterNotNull() }
 
 // Like Kotlin's lazy delegate but the initializer gets the target and metadata passed to it
-private class Lazy<T, V>(private val initializer: (T, KProperty<*>) -> V) : ReadOnlyProperty<T, V> {
-    private object EMPTY
+private open class Lazy<in T, out V>(private val initializer: (T, KProperty<*>) -> V) : ReadOnlyProperty<T, V> {
+    protected object EMPTY
 
-    private var value: Any? = EMPTY
+    protected var value: Any? = EMPTY
 
     override fun getValue(thisRef: T, property: KProperty<*>): V {
-        if (value == EMPTY) {
+        if (value == EMPTY)
             value = initializer(thisRef, property)
-        }
-        @Suppress("UNCHECKED_CAST")
+
         return value as V
     }
+}
+
+/*
+ * The components below are a variant of the view bindings with lazy resettables
+ * All bindings are weakly held so that they may be reset through KotterknifeRegistry.reset
+ *
+ * This is typically only needed in cases such as Fragments,
+ * where their lifecycle doesn't match that of an Activity or View
+ *
+ * Credits to <a href="https://github.com/MichaelRocks">MichaelRocks</a>
+ */
+
+fun <V : View> View.bindViewResettable(id: Int)
+        : ReadOnlyProperty<View, V> = requiredResettable(id, viewFinder)
+
+fun <V : View> Activity.bindViewResettable(id: Int)
+        : ReadOnlyProperty<Activity, V> = requiredResettable(id, viewFinder)
+
+fun <V : View> Dialog.bindViewResettable(id: Int)
+        : ReadOnlyProperty<Dialog, V> = requiredResettable(id, viewFinder)
+
+fun <V : View> DialogFragment.bindViewResettable(id: Int)
+        : ReadOnlyProperty<DialogFragment, V> = requiredResettable(id, viewFinder)
+
+fun <V : View> SupportDialogFragment.bindViewResettable(id: Int)
+        : ReadOnlyProperty<android.support.v4.app.DialogFragment, V> = requiredResettable(id, viewFinder)
+
+fun <V : View> Fragment.bindViewResettable(id: Int)
+        : ReadOnlyProperty<Fragment, V> = requiredResettable(id, viewFinder)
+
+fun <V : View> SupportFragment.bindViewResettable(id: Int)
+        : ReadOnlyProperty<android.support.v4.app.Fragment, V> = requiredResettable(id, viewFinder)
+
+fun <V : View> ViewHolder.bindViewResettable(id: Int)
+        : ReadOnlyProperty<ViewHolder, V> = requiredResettable(id, viewFinder)
+
+fun <V : View> View.bindOptionalViewResettable(id: Int)
+        : ReadOnlyProperty<View, V?> = optionalResettable(id, viewFinder)
+
+fun <V : View> Activity.bindOptionalViewResettable(id: Int)
+        : ReadOnlyProperty<Activity, V?> = optionalResettable(id, viewFinder)
+
+fun <V : View> Dialog.bindOptionalViewResettable(id: Int)
+        : ReadOnlyProperty<Dialog, V?> = optionalResettable(id, viewFinder)
+
+fun <V : View> DialogFragment.bindOptionalViewResettable(id: Int)
+        : ReadOnlyProperty<DialogFragment, V?> = optionalResettable(id, viewFinder)
+
+fun <V : View> SupportDialogFragment.bindOptionalViewResettable(id: Int)
+        : ReadOnlyProperty<android.support.v4.app.DialogFragment, V?> = optionalResettable(id, viewFinder)
+
+fun <V : View> Fragment.bindOptionalViewResettable(id: Int)
+        : ReadOnlyProperty<Fragment, V?> = optionalResettable(id, viewFinder)
+
+fun <V : View> SupportFragment.bindOptionalViewResettable(id: Int)
+        : ReadOnlyProperty<android.support.v4.app.Fragment, V?> = optionalResettable(id, viewFinder)
+
+fun <V : View> ViewHolder.bindOptionalViewResettable(id: Int)
+        : ReadOnlyProperty<ViewHolder, V?> = optionalResettable(id, viewFinder)
+
+fun <V : View> View.bindViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<View, List<V>> = requiredResettable(ids, viewFinder)
+
+fun <V : View> Activity.bindViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<Activity, List<V>> = requiredResettable(ids, viewFinder)
+
+fun <V : View> Dialog.bindViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<Dialog, List<V>> = requiredResettable(ids, viewFinder)
+
+fun <V : View> DialogFragment.bindViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<DialogFragment, List<V>> = requiredResettable(ids, viewFinder)
+
+fun <V : View> SupportDialogFragment.bindViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<android.support.v4.app.DialogFragment, List<V>> = requiredResettable(ids, viewFinder)
+
+fun <V : View> Fragment.bindViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<Fragment, List<V>> = requiredResettable(ids, viewFinder)
+
+fun <V : View> SupportFragment.bindViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<android.support.v4.app.Fragment, List<V>> = requiredResettable(ids, viewFinder)
+
+fun <V : View> ViewHolder.bindViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<ViewHolder, List<V>> = requiredResettable(ids, viewFinder)
+
+fun <V : View> View.bindOptionalViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<View, List<V>> = optionalResettable(ids, viewFinder)
+
+fun <V : View> Activity.bindOptionalViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<Activity, List<V>> = optionalResettable(ids, viewFinder)
+
+fun <V : View> Dialog.bindOptionalViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<Dialog, List<V>> = optionalResettable(ids, viewFinder)
+
+fun <V : View> DialogFragment.bindOptionalViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<DialogFragment, List<V>> = optionalResettable(ids, viewFinder)
+
+fun <V : View> SupportDialogFragment.bindOptionalViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<android.support.v4.app.DialogFragment, List<V>> = optionalResettable(ids, viewFinder)
+
+fun <V : View> Fragment.bindOptionalViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<Fragment, List<V>> = optionalResettable(ids, viewFinder)
+
+fun <V : View> SupportFragment.bindOptionalViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<android.support.v4.app.Fragment, List<V>> = optionalResettable(ids, viewFinder)
+
+fun <V : View> ViewHolder.bindOptionalViewsResettable(vararg ids: Int)
+        : ReadOnlyProperty<ViewHolder, List<V>> = optionalResettable(ids, viewFinder)
+
+private fun <T, V : View> requiredResettable(id: Int, finder: T.(Int) -> View?)
+        = LazyResettable { t: T, desc -> (t.finder(id) as V?)?.apply { } ?: viewNotFound(id, desc) }
+
+private fun <T, V : View> optionalResettable(id: Int, finder: T.(Int) -> View?)
+        = LazyResettable { t: T, _ -> t.finder(id) as V? }
+
+private fun <T, V : View> requiredResettable(ids: IntArray, finder: T.(Int) -> View?)
+        = LazyResettable { t: T, desc -> ids.map { t.finder(it) as V? ?: viewNotFound(it, desc) } }
+
+private fun <T, V : View> optionalResettable(ids: IntArray, finder: T.(Int) -> View?)
+        = LazyResettable { t: T, _ -> ids.map { t.finder(it) as V? }.filterNotNull() }
+
+//Like Kotterknife's lazy delegate but is resettable
+private class LazyResettable<in T, out V>(initializer: (T, KProperty<*>) -> V) : Lazy<T, V>(initializer) {
+    override fun getValue(thisRef: T, property: KProperty<*>): V {
+        KotterknifeRegistry.register(thisRef!!, this)
+        return super.getValue(thisRef, property)
+    }
+
+    fun reset() {
+        value = EMPTY
+    }
+}
+
+object Kotterknife {
+    fun reset(target: Any) {
+        KotterknifeRegistry.reset(target)
+    }
+}
+
+private object KotterknifeRegistry {
+    private val lazyMap = WeakHashMap<Any, MutableCollection<LazyResettable<*, *>>>()
+
+    fun register(target: Any, lazy: LazyResettable<*, *>)
+            = lazyMap.getOrPut(target, { Collections.newSetFromMap(WeakHashMap()) }).add(lazy)
+
+    fun reset(target: Any) = lazyMap[target]?.forEach { it.reset() }
 }
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/PackageUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/PackageUtils.kt
index 36bcc93..42d150e 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/utils/PackageUtils.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/PackageUtils.kt
@@ -1,5 +1,6 @@
 package ca.allanwang.kau.utils
 
+import android.annotation.SuppressLint
 import android.content.Context
 import android.content.pm.PackageManager
 import android.os.Build
@@ -31,11 +32,9 @@ import android.os.Build
 }
 
 inline val buildIsMarshmallowAndUp: Boolean
-
     get() = Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
 
 inline val buildIsLollipopAndUp: Boolean
-    @SuppressWarnings("NewApi")
     get() = Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP
 
 inline val buildIsNougatAndUp: Boolean
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/ViewUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/ViewUtils.kt
index ead2cb7..53d711d 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/utils/ViewUtils.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/ViewUtils.kt
@@ -3,20 +3,21 @@
 package ca.allanwang.kau.utils
 
 import android.animation.ValueAnimator
+import android.annotation.SuppressLint
 import android.content.Context
 import android.graphics.Color
 import android.os.Build
-import android.support.annotation.*
+import android.support.annotation.ColorInt
+import android.support.annotation.ColorRes
+import android.support.annotation.RequiresApi
+import android.support.annotation.StringRes
 import android.support.design.widget.FloatingActionButton
 import android.support.design.widget.Snackbar
 import android.support.design.widget.TextInputEditText
-import android.support.transition.AutoTransition
-import android.support.transition.Transition
-import android.support.transition.TransitionInflater
-import android.support.transition.TransitionManager
 import android.support.v7.widget.LinearLayoutManager
 import android.support.v7.widget.RecyclerView
 import android.view.LayoutInflater
+import android.view.MotionEvent
 import android.view.View
 import android.view.ViewGroup
 import android.view.inputmethod.InputMethodManager
@@ -135,7 +136,6 @@ fun FloatingActionButton.hideIf(hide: Boolean) = if (hide) hide() else show()
             if (flag and KAU_RIGHT > 0) margin else p.rightMargin,
             if (flag and KAU_BOTTOM > 0) margin else p.bottomMargin
     )
-    requestLayout()
     return true
 }
 
@@ -184,7 +184,6 @@ fun FloatingActionButton.hideIf(hide: Boolean) = if (hide) hide() else show()
             if (flag and KAU_RIGHT > 0) padding else paddingRight,
             if (flag and KAU_BOTTOM > 0) padding else paddingBottom
     )
-    requestLayout()
 }
 
 @KauUtils fun View.hideKeyboard() {
@@ -222,23 +221,19 @@ fun Context.fullLinearRecycler(rvAdapter: RecyclerView.Adapter<*>? = null, confi
 }
 
 /**
- * Animate a transition for a FloatinActionButton
+ * Animate a transition a given imageview
  * If it is not shown, the action will be invoked directly and the fab will be shown
  * If it is already shown, scaling and alpha animations will be added to the action
  */
-inline fun FloatingActionButton.transition(crossinline action: FloatingActionButton.() -> Unit) {
-    if (isHidden) {
-        action()
-        show()
-    } else {
+inline fun <T : ImageView> T.fadeScaleTransition(duration: Long = 500L, minScale: Float = 0.7f, crossinline action: T.() -> Unit) {
+    if (!isVisible) action()
+    else {
         var transitioned = false
         ValueAnimator.ofFloat(1.0f, 0.0f, 1.0f).apply {
-            duration = 500L
+            this.duration = duration
             addUpdateListener {
                 val x = it.animatedValue as Float
-                val scale = x * 0.3f + 0.7f
-                scaleX = scale
-                scaleY = scale
+                scaleXY = x * (1 - minScale) + minScale
                 imageAlpha = (x * 255).toInt()
                 if (it.animatedFraction > 0.5f && !transitioned) {
                     transitioned = true
@@ -266,4 +261,29 @@ fun FloatingActionButton.hideOnDownwardsScroll(recycler: RecyclerView) {
             else if (dy < 0 && isHidden) show()
         }
     })
+}
+
+inline var View.scaleXY
+    get() = Math.max(scaleX, scaleY)
+    set(value) {
+        scaleX = value
+        scaleY = value
+    }
+
+/**
+ * Creates an on touch listener that only emits on a short single tap
+ */
+@SuppressLint("ClickableViewAccessibility")
+inline fun View.setOnSingleTapListener(crossinline onSingleTap: (v: View, event: MotionEvent) -> Unit) {
+    setOnTouchListener { v, event ->
+        when (event.actionMasked) {
+            MotionEvent.ACTION_DOWN -> true
+            MotionEvent.ACTION_UP -> {
+                if (event.eventTime - event.downTime < 100)
+                    onSingleTap(v, event)
+                true
+            }
+            else -> false
+        }
+    }
 }
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/changelog/Changelog.kt b/core/src/main/kotlin/ca/allanwang/kau/xml/Changelog.kt
index 43546ae..4bf1836 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/changelog/Changelog.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/xml/Changelog.kt
@@ -1,4 +1,4 @@
-package ca.allanwang.kau.changelog
+package ca.allanwang.kau.xml
 
 import android.content.Context
 import android.content.res.XmlResourceParser
diff --git a/core/src/main/kotlin/ca/allanwang/kau/xml/FAQ.kt b/core/src/main/kotlin/ca/allanwang/kau/xml/FAQ.kt
new file mode 100644
index 0000000..dedfbbf
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/xml/FAQ.kt
@@ -0,0 +1,42 @@
+package ca.allanwang.kau.xml
+
+import android.content.Context
+import android.content.res.XmlResourceParser
+import android.support.annotation.XmlRes
+import android.text.Html
+import android.text.Spanned
+import ca.allanwang.kau.utils.use
+import org.xmlpull.v1.XmlPullParser
+
+/**
+ * Created by Allan Wang on 2017-07-30.
+ */
+
+/**
+ * Parse an xml with two tags, <question>Text</question> and <answer>Text</answer>,
+ * and return them as a list of string pairs
+ */
+fun Context.kauParseFaq(@XmlRes xmlRes: Int, withNumbering: Boolean = true): List<Pair<Spanned, Spanned>> {
+    val items = mutableListOf<Pair<Spanned, Spanned>>()
+    resources.getXml(xmlRes).use {
+        parser: XmlResourceParser ->
+        var eventType = parser.eventType
+        var question: Spanned? = null
+        while (eventType != XmlPullParser.END_DOCUMENT) {
+            if (eventType == XmlPullParser.START_TAG) {
+                if (parser.name == "question") {
+                    var q = parser.text.replace("\n", "<br/>")
+                    if (withNumbering) q = "${items.size + 1}. $q"
+                    question = Html.fromHtml(q)
+                } else if (parser.name == "answer") {
+                    items.add(Pair(question ?: throw IllegalArgumentException("KAU FAQ answer found without a question"),
+                            Html.fromHtml(parser.text.replace("\n", "<br/>"))))
+                    question = null
+                }
+            }
+
+            eventType = parser.next()
+        }
+    }
+    return items
+}
\ No newline at end of file