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• 0.5.20
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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()
    }
}