rcmkt/ChangeOutlineRadiusTransition.kt

## ChangeOutlineRadiusTransition.kt
class ChangeOutlineRadiusTransition(
        private val startRadius: Int,
        private val endRadius: Int
) : Transition() {

    private companion object {
        /**
         * Unique key for start and end values to be kept in [TransitionValues] [TransitionValues]
         */
        private const val RADIUS = "ChangeOutlineRadiusTransition:outlineRadius"

        /**
         * The properties from [TransitionValues]
         */
        private val PROPERTIES = arrayOf(RADIUS)

        /**
         * Animator property which will set a rounded outline through a [ViewOutlineProvider]
         */
        private object OutlineRadiusProperty : Property<View, Int>(Int::class.java, "outlineRadius") {
            var offset = 0

            override fun get(view: View) = 0

            override fun set(view: View, value: Int) {
                view.outlineProvider = object : ViewOutlineProvider() {
                    override fun getOutline(view: View, outline: Outline) {
                        outline.setRoundRect(0, 0, view.width, view.height + offset, value.toFloat())
                    }
                }
            }
        }
    }

    override fun getTransitionProperties(): Array<String> {
        return PROPERTIES
    }

    override fun captureStartValues(transitionValues: TransitionValues) {
        val view = transitionValues.view
        if (view !is ImageView || view.getVisibility() != View.VISIBLE) {
            return
        }
        transitionValues.values[RADIUS] = startRadius
    }

    override fun captureEndValues(transitionValues: TransitionValues) {
        val view = transitionValues.view
        if (view !is ImageView || view.getVisibility() != View.VISIBLE) {
            return
        }
        transitionValues.values[RADIUS] = endRadius
    }

    override fun createAnimator(sceneRoot: ViewGroup, startValues: TransitionValues?, endValues: TransitionValues?): Animator {
        val view = endValues?.view
        view?.clipToOutline = true

        val startRadius = startValues?.values?.get(RADIUS) as? Int ?: 0
        val endRadius = endValues?.values?.get(RADIUS) as? Int ?: 0

        val property = OutlineRadiusProperty.apply { offset = if (startRadius > 0) startRadius else endRadius }
        return ObjectAnimator.ofInt(view, property, startRadius, endRadius)
    }
}
	class ChangeOutlineRadiusTransition(
	private val startRadius: Int,
	private val endRadius: Int
	) : Transition() {

	private companion object {
	/**
	* Unique key for start and end values to be kept in [TransitionValues] [TransitionValues]
	*/
	private const val RADIUS = "ChangeOutlineRadiusTransition:outlineRadius"

	/**
	* The properties from [TransitionValues]
	*/
	private val PROPERTIES = arrayOf(RADIUS)

	/**
	* Animator property which will set a rounded outline through a [ViewOutlineProvider]
	*/
	private object OutlineRadiusProperty : Property<View, Int>(Int::class.java, "outlineRadius") {
	var offset = 0

	override fun get(view: View) = 0

	override fun set(view: View, value: Int) {
	view.outlineProvider = object : ViewOutlineProvider() {
	override fun getOutline(view: View, outline: Outline) {
	outline.setRoundRect(0, 0, view.width, view.height + offset, value.toFloat())
	}
	}
	}
	}
	}

	override fun getTransitionProperties(): Array<String> {
	return PROPERTIES
	}

	override fun captureStartValues(transitionValues: TransitionValues) {
	val view = transitionValues.view
	if (view !is ImageView \|\| view.getVisibility() != View.VISIBLE) {
	return
	}
	transitionValues.values[RADIUS] = startRadius
	}

	override fun captureEndValues(transitionValues: TransitionValues) {
	val view = transitionValues.view
	if (view !is ImageView \|\| view.getVisibility() != View.VISIBLE) {
	return
	}
	transitionValues.values[RADIUS] = endRadius
	}

	override fun createAnimator(sceneRoot: ViewGroup, startValues: TransitionValues?, endValues: TransitionValues?): Animator {
	val view = endValues?.view
	view?.clipToOutline = true

	val startRadius = startValues?.values?.get(RADIUS) as? Int ?: 0
	val endRadius = endValues?.values?.get(RADIUS) as? Int ?: 0

	val property = OutlineRadiusProperty.apply { offset = if (startRadius > 0) startRadius else endRadius }
	return ObjectAnimator.ofInt(view, property, startRadius, endRadius)
	}
	}