BannerViewPager/app/src/main/java/com/example/zhpan/banner/activity/WelcomeActivity.kt

package com.example.zhpan.banner.activity

import android.animation.AnimatorSet
import android.animation.ObjectAnimator
import android.os.Bundle
import android.view.View
import android.view.animation.DecelerateInterpolator
import androidx.core.content.ContextCompat
import androidx.viewpager2.widget.ViewPager2
import com.blankj.utilcode.util.ToastUtils
import com.example.zhpan.banner.R
import com.example.zhpan.banner.adapter.SimpleAdapter
import com.example.zhpan.banner.bean.CustomBean
import com.example.zhpan.banner.databinding.ActivityWelcomeBinding
import com.example.zhpan.banner.transform.PageTransformerFactory
import com.zhpan.bannerview.BannerViewPager
import com.example.zhpan.banner.transform.TransformerStyle
import com.zhpan.bannerview.utils.BannerUtils
import com.zhpan.indicator.enums.IndicatorSlideMode
import java.util.*

class WelcomeActivity : BaseDataActivity() {

  private lateinit var mViewPager: BannerViewPager<CustomBean>
  private lateinit var binding: ActivityWelcomeBinding

  private val des = arrayOf("在这里\n你可以听到周围人的心声", "在这里\nTA会在下一秒遇见你", "在这里\n不再错过可以改变你一生的人")

  private val transforms = intArrayOf(
    TransformerStyle.NONE,
    TransformerStyle.ACCORDION,
    TransformerStyle.DEPTH,
    TransformerStyle.DEPTH_SCALE,
    TransformerStyle.ROTATE,
    TransformerStyle.SCALE_IN,
    TransformerStyle.ROTATE_UP
  )

  private val data: List<CustomBean>
    get() {
      val list = ArrayList<CustomBean>()
      for (i in mDrawableList.indices) {
        val customBean = CustomBean()
        customBean.imageRes = mDrawableList[i]
        customBean.imageDescription = des[i]
        list.add(customBean)
      }
      return list
    }

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    binding = ActivityWelcomeBinding.inflate(layoutInflater)
    setContentView(binding.root)
    setupViewPager()
    updateUI(0)
  }

  private fun setupViewPager() {
    mViewPager = findViewById(R.id.viewpager)
    mViewPager.apply {
      setCanLoop(false)
      setPageTransformer(
        PageTransformerFactory.createPageTransformer(transforms[Random().nextInt(7)])
      )
      setIndicatorMargin(0, 0, 0, resources.getDimensionPixelOffset(R.dimen.dp_100))
      setIndicatorSliderGap(
        resources.getDimension(R.dimen.dp_10)
          .toInt()
      )
      setIndicatorSlideMode(IndicatorSlideMode.SMOOTH)
      setIndicatorSliderRadius(
        resources.getDimension(R.dimen.dp_3)
          .toInt(), resources.getDimension(R.dimen.dp_4_5)
          .toInt()
      )
      registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
        override fun onPageSelected(position: Int) {
          BannerUtils.log("position:$position")
          updateUI(position)
        }
      })
      adapter = SimpleAdapter().apply {
        mOnSubViewClickListener = object : SimpleAdapter.OnSubViewClickListener {
          override fun onViewClick(
            view: View?,
            position: Int
          ) {
            ToastUtils.showShort("Logo Clicked,position:$position")
          }
        }
      }
      setIndicatorSliderColor(
        ContextCompat.getColor(this@WelcomeActivity, R.color.white),
        ContextCompat.getColor(this@WelcomeActivity, R.color.white_alpha_75)
      )
    }
      .create(data)
  }

  fun onClick(view: View) {
    MainActivity.start(this)
    finish()
  }

  private fun updateUI(position: Int) {
    binding.tvDescribe.text = des[position]
    val translationAnim = ObjectAnimator.ofFloat(binding.tvDescribe, "translationX", -120f, 0f)
    translationAnim.apply {
      duration = ANIMATION_DURATION.toLong()
      interpolator = DecelerateInterpolator()
    }
    val alphaAnimator = ObjectAnimator.ofFloat(binding.tvDescribe, "alpha", 0f, 1f)
    alphaAnimator.apply {
      duration = ANIMATION_DURATION.toLong()
    }
    val animatorSet = AnimatorSet()
    animatorSet.playTogether(translationAnim, alphaAnimator)
    animatorSet.start()

    if (position == mViewPager.data.size - 1 && binding.btnStart.visibility == View.GONE) {
      binding.btnStart.visibility = View.VISIBLE
      ObjectAnimator
        .ofFloat(binding.btnStart, "alpha", 0f, 1f)
        .setDuration(ANIMATION_DURATION.toLong())
        .start()
    } else {
      binding.btnStart.visibility = View.GONE
    }
  }

  companion object {
    private const val ANIMATION_DURATION = 1300
    private const val MIN_SCALE = 0.9f
    private const val MIN_ALPHA = 0.7f
  }
}