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-rw-r--r--core/src/main/kotlin/ca/allanwang/kau/ui/ProgressAnimator.kt85
1 files changed, 85 insertions, 0 deletions
diff --git a/core/src/main/kotlin/ca/allanwang/kau/ui/ProgressAnimator.kt b/core/src/main/kotlin/ca/allanwang/kau/ui/ProgressAnimator.kt
new file mode 100644
index 0000000..dc10e71
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/ui/ProgressAnimator.kt
@@ -0,0 +1,85 @@
+package ca.allanwang.kau.ui
+
+import android.animation.Animator
+import android.animation.AnimatorListenerAdapter
+import android.animation.ValueAnimator
+import android.view.animation.Interpolator
+
+/**
+ * Created by Allan Wang on 2017-11-10.
+ *
+ * Wrapper for value animator specifically dealing with progress values
+ * This is typically a float range of 0 to 1, but can be customized
+ * This differs in that everything can be done with simple listeners, which will be bundled
+ * and added to the backing [ValueAnimator]
+ */
+class ProgressAnimator private constructor(private vararg val values: Float) {
+
+ companion object {
+ inline fun ofFloat(crossinline builder: ProgressAnimator.() -> Unit) = ofFloat(0f, 1f) { builder() }
+
+ fun ofFloat(vararg values: Float, builder: ProgressAnimator.() -> Unit) = ProgressAnimator(*values).apply {
+ builder()
+ build()
+ }
+ }
+
+ private val animators: MutableList<(Float) -> Unit> = mutableListOf()
+ private val startActions: MutableList<() -> Unit> = mutableListOf()
+ private val endActions: MutableList<() -> Unit> = mutableListOf()
+
+ var duration: Long = -1L
+ var interpolator: Interpolator? = null
+
+ /**
+ * Add more changes to the [ValueAnimator] before running
+ */
+ var extraConfigs: ValueAnimator.() -> Unit = {}
+
+ /**
+ * Range animator. Multiples the range by the current float progress before emission
+ */
+ fun withAnimator(from: Float, to: Float, animator: (Float) -> Unit) = animators.add {
+ val range = to - from
+ animator(range * it + from)
+ }
+
+ /**
+ * Standard animator. Emits progress value as is
+ */
+ fun withAnimator(animator: (Float) -> Unit) = animators.add(animator)
+
+ /**
+ * Start action to be called once when the animator first begins
+ */
+ fun withStartAction(action: () -> Unit) = startActions.add(action)
+
+ /**
+ * End action to be called once when the animator ends
+ */
+ fun withEndAction(action: () -> Unit) = endActions.add(action)
+
+ fun build() {
+ ValueAnimator.ofFloat(*values).apply {
+ if (this@ProgressAnimator.duration > 0L)
+ duration = this@ProgressAnimator.duration
+ if (this@ProgressAnimator.interpolator != null)
+ interpolator = this@ProgressAnimator.interpolator
+ addUpdateListener {
+ val progress = it.animatedValue as Float
+ animators.forEach { it(progress) }
+ }
+ addListener(object : AnimatorListenerAdapter() {
+ override fun onAnimationStart(animation: Animator?) {
+ startActions.forEach { it() }
+ }
+
+ override fun onAnimationEnd(animation: Animator?) {
+ endActions.forEach { it() }
+ }
+ })
+ extraConfigs()
+ start()
+ }
+ }
+} \ No newline at end of file