84 lines
3.1 KiB
Kotlin
84 lines
3.1 KiB
Kotlin
package com.vanced.manager.ui
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import android.animation.Animator
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import android.animation.ValueAnimator
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import android.os.Bundle
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import android.view.animation.AccelerateDecelerateInterpolator
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import androidx.appcompat.app.AppCompatActivity
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import androidx.viewpager2.widget.ViewPager2
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import com.vanced.manager.adapter.WelcomePageAdapter
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import com.vanced.manager.databinding.ActivityWelcomeBinding
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import kotlin.math.abs
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class WelcomeActivity : AppCompatActivity() {
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private lateinit var viewPager2: ViewPager2
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private lateinit var binding: ActivityWelcomeBinding
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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binding = ActivityWelcomeBinding.inflate(layoutInflater)
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setContentView(binding.root)
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viewPager2 = binding.welcomeViewpager
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viewPager2.apply {
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adapter = WelcomePageAdapter(this@WelcomeActivity)
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isUserInputEnabled = false
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setPageTransformer { page, position ->
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page.apply {
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val pageWidth = width
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//Thank you, fragula dev!
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when {
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position > 0 && position < 1 -> {
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alpha = 1f
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translationX = 0f
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}
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position > -1 && position <= 0 -> {
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alpha = 1.0f - abs(position * 0.7f)
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translationX = -pageWidth * position / 1.3F
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}
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}
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}
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}
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}
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}
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override fun onBackPressed() {
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if (viewPager2.currentItem == 0) {
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super.onBackPressed()
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} else {
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navigateTo(viewPager2.currentItem - 1)
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}
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}
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fun navigateTo(position: Int) {
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viewPager2.currentPosition = position
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}
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//Shit way to implement animation duration, but at least it works
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private var ViewPager2.currentPosition: Int
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get() = currentItem
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set(value) {
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val pixelsToDrag: Int = width * (value - currentItem)
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val animator = ValueAnimator.ofInt(0, pixelsToDrag)
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var previousValue = 0
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animator.apply {
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addUpdateListener { valueAnimator ->
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val currentValue = valueAnimator.animatedValue as Int
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val currentPxToDrag = (currentValue - previousValue).toFloat()
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fakeDragBy(-currentPxToDrag)
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previousValue = currentValue
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}
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addListener(object : Animator.AnimatorListener {
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override fun onAnimationStart(animation: Animator?) { beginFakeDrag() }
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override fun onAnimationEnd(animation: Animator?) { endFakeDrag() }
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override fun onAnimationCancel(animation: Animator?) {}
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override fun onAnimationRepeat(animation: Animator?) {}
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})
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interpolator = AccelerateDecelerateInterpolator()
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duration = 500
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start()
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}
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}
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} |