TextTabActivity.kt

package jp.co.cyberagent.android.tabanimationsample

import android.graphics.Color
import android.view.View
import androidx.core.content.ContextCompat
import jp.co.cyberagent.android.tabanimation.SimpleTab
import jp.co.cyberagent.android.tabanimation.ViewIdAnimationInfoSet
import jp.co.cyberagent.android.tabanimation.property
import jp.co.cyberagent.android.tabanimation.viewIdAnimationInfo

class TextTabActivity : BaseActivity() {

  companion object {
    private const val TAB_SELECTED_SCALE = 1f
    private const val TAB_UNSELECTED_SCALE = 0.9f
  }

  override val animationInfo: ViewIdAnimationInfoSet =
    viewIdAnimationInfo {
      animateText<Float> {
        property(View.SCALE_X)
        startValue(TAB_UNSELECTED_SCALE)
        endValue(TAB_SELECTED_SCALE)
      }
      animateText<Float> {
        property(View.SCALE_Y)
        startValue(TAB_UNSELECTED_SCALE)
        endValue(TAB_SELECTED_SCALE)
      }
      animateText<Int> {
        property(
          getter = { currentTextColor },
          setter = { setTextColor(it) }
        )
        startValue(Color.GRAY)
        endValue { ContextCompat.getColor(it.context, R.color.colorAccent) }
      }
    }

  override val tabType: SimpleTab = SimpleTab.TEXT
}