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• Emptyable.scala

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io.taig.android.widget.recycler.Emptyable.scala Maven / Gradle / Ivy

package io.taig.android.widget.recycler

import android.support.v7.widget.RecyclerView
import android.support.v7.widget.RecyclerView.{
  Adapter,
  AdapterDataObserver,
  ViewHolder
}
import android.view.View
import android.view.View.{GONE, VISIBLE}

trait Emptyable extends RecyclerView {
  private var empty: Option[View] = None

  def setEmptyView(view: View): Unit = {
    empty = Option(view)
    update()
  }

  def getEmptyView = empty.orNull

  override def setAdapter(adapter: Adapter[_ <: ViewHolder]): Unit = {
    // Unregister observer from previous adapter
    Option(getAdapter).foreach(_.unregisterAdapterDataObserver(Observer))

    super.setAdapter(adapter)

    // Register observer to current adapter
    Option(adapter).foreach(_.registerAdapterDataObserver(Observer))

    update()
  }

  private def update() = (empty, Option(getAdapter)) match {
    case (Some(empty), Some(adapter)) if adapter.getItemCount == 0 ⇒
      empty.setVisibility(VISIBLE)
      setVisibility(GONE)
    case (Some(empty), None) ⇒
      empty.setVisibility(VISIBLE)
      setVisibility(GONE)
    case (Some(empty), Some(_)) ⇒
      empty.setVisibility(GONE)
      setVisibility(VISIBLE)
    case _ ⇒ // Nothing to do
  }

  private object Observer extends AdapterDataObserver {
    override def onChanged() = update()
  }
}