make sure the animation is only started once, to improve the animation

inspired by razir#30

Author: raffaelgyr

progressbutton/src/main/java/com/github/razir/progressbutton/DrawableButtonExtensions.kt

@@ -180,9 +180,6 @@ private fun TextView.showDrawable(
 
     addDrawableAttachViewListener()
     setupDrawableCallback(this, drawable)
-    if (drawable is Animatable) {
-        drawable.start()
-    }
 }
 
 private fun setupDrawableCallback(textView: TextView, drawable: Drawable) {
@@ -199,7 +196,7 @@ private fun setupDrawableCallback(textView: TextView, drawable: Drawable) {
     }
     activeViews[textView] = DrawableViewData(drawable, callback)
     drawable.callback = callback
-    if (drawable is Animatable) {
+    if (drawable is Animatable && !drawable.isRunning) {
         drawable.start()
     }
 }

progressbutton/src/main/java/com/github/razir/progressbutton/ProgressButtonHolder.kt

@@ -27,7 +27,7 @@ fun LifecycleOwner.bindProgressButton(button: TextView) {
 fun TextView.cleanUpDrawable() {
     if (activeViews.containsKey(this)) {
         activeViews[this]?.drawable?.apply {
-            if (this is Animatable) {
+            if (this is Animatable && drawable.isRunning) {
                 stop()
             }
             callback = null
@@ -83,7 +83,7 @@ private val drawablesAttachListener = object : View.OnAttachStateChangeListener
     override fun onViewDetachedFromWindow(v: View?) {
         if (activeViews.containsKey(v)) {
             activeViews[v]?.drawable?.apply {
-                if (this is Animatable) {
+                if (this is Animatable && drawable.isRunning) {
                     stop()
                 }
             }
@@ -93,7 +93,7 @@ private val drawablesAttachListener = object : View.OnAttachStateChangeListener
     override fun onViewAttachedToWindow(v: View?) {
         if (activeViews.containsKey(v)) {
             activeViews[v]?.drawable?.apply {
-                if (this is Animatable) {
+                if (this is Animatable && !drawable.isRunning) {
                     start()
                 }
             }