79 lines
2.3 KiB
Kotlin
79 lines
2.3 KiB
Kotlin
package com.github.apognu.otter.views
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import android.animation.Animator
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import android.animation.ObjectAnimator
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import android.graphics.Rect
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import android.view.View
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import android.view.ViewGroup
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import androidx.transition.TransitionValues
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import androidx.transition.Visibility
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class ExplodeReveal : Visibility() {
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val SCREEN_BOUNDS = "screenBounds"
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private val locations = IntArray(2)
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override fun captureStartValues(transitionValues: TransitionValues) {
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super.captureStartValues(transitionValues)
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capture(transitionValues)
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}
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override fun captureEndValues(transitionValues: TransitionValues) {
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super.captureEndValues(transitionValues)
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capture(transitionValues)
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}
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override fun onAppear(sceneRoot: ViewGroup, view: View, startValues: TransitionValues?, endValues: TransitionValues?): Animator? {
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if (endValues == null) return null
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val bounds = endValues.values[SCREEN_BOUNDS] as Rect
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val endY = view.translationY
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val distance = calculateDistance(sceneRoot, bounds)
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val startY = endY + distance
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return ObjectAnimator.ofFloat(view, View.TRANSLATION_Y, startY, endY)
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}
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override fun onDisappear(sceneRoot: ViewGroup, view: View, startValues: TransitionValues?, endValues: TransitionValues?): Animator? {
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if (startValues == null) return null
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val bounds = startValues.values[SCREEN_BOUNDS] as Rect
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val startY = view.translationY
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val distance = calculateDistance(sceneRoot, bounds)
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val endY = startY + distance
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return ObjectAnimator.ofFloat(view, View.TRANSLATION_Y, startY, endY)
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}
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private fun capture(transitionValues: TransitionValues) {
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transitionValues.view.also {
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it.getLocationOnScreen(locations)
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val left = locations[0]
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val top = locations[1]
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val right = left + it.width
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val bottom = top + it.height
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transitionValues.values[SCREEN_BOUNDS] = Rect(left, top, right, bottom)
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}
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}
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private fun calculateDistance(sceneRoot: View, viewBounds: Rect): Int {
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sceneRoot.getLocationOnScreen(locations)
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val sceneRootY = locations[1]
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return when (epicenter) {
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is Rect -> return when {
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viewBounds.top <= (epicenter as Rect).top -> sceneRootY - (epicenter as Rect).top
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else -> sceneRootY + sceneRoot.height - (epicenter as Rect).bottom
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}
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else -> -sceneRoot.height
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}
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}
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} |