lukelorusso

package com.lukelorusso.toomuchofscrolling

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.RecyclerView
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity(R.layout.activity_main) {

    companion object {

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fun RecyclerView.bindScrollTo(vararg destinations: RecyclerView): RecyclerView.OnScrollListener {
    object : RecyclerView.OnScrollListener() {
        override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
            // each time you drag a RecyclerView, you should STOP other destinations' scrolling
            if (newState == RecyclerView.SCROLL_STATE_DRAGGING)
                destinations.forEach { destinationRecyclerView ->
                    destinationRecyclerView.stopScroll()
                }
            // then you can scroll the RecyclerView, dragged or not
            super.onScrollStateChanged(recyclerView, newState)

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fun RecyclerView.bindScrollTo(vararg destinations: RecyclerView) {
    object : RecyclerView.OnScrollListener() {
        override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
            super.onScrollStateChanged(recyclerView, newState)
        }

        override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
            // when you scroll a RecyclerView of some [dx, dy] you can do it
            super.onScrolled(recyclerView, dx, dy)

lukelorusso

fun RecyclerView.bindScrollTo(vararg destinations: RecyclerView) {
    object : RecyclerView.OnScrollListener() {
        override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
            super.onScrollStateChanged(recyclerView, newState)
        }

        override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
            super.onScrolled(recyclerView, dx, dy)
            // First try: it didn't work...
            destinations.forEach { destinationRecyclerView ->

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class Base10Adapter : RecyclerView.Adapter<Base10Adapter.ViewHolder>() {
    var data: List<String> = emptyList()
        set(value) {
            field = value
            notifyDataSetChanged()
        }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder =
        ViewHolder(
            LayoutInflater.from(parent.context).inflate(

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<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/itemBase10TextView"
    android:layout_width="@dimen/item_fixed_width"
    android:layout_height="wrap_content"
    android:background="#E0FCFF"
    android:gravity="center"
    android:padding="15dp"
    tools:text="0" />

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<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="item_fixed_width">70dp</dimen>
</resources>

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<?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"><!-- vertical scrolling purpose -->

    <LinearLayout
        android:layout_width="match_parent"

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    private fun renderCode() {
        for (i in 0 until llCodeWrapper.childCount) {
            val itemContainer = llCodeWrapper.getChildAt(i)

            itemContainer.findViewById<TextView>(R.id.tvCode).text =
                if (text.length > i)
                    (if (maskTheCode) codeMaskChar else text[i])
                        .toString()
                else ""

lukelorusso

    var text: Editable = "".toEditable()
        set(value) {
            field = value
            renderCode() // let's keep this for later
        }
    ...
    
    override fun onAttachedToWindow() {
        super.onAttachedToWindow()
        ...