Page scrolling with Scrollable.ensureVisible()

readme.md

Page scrolling with Scrollable.ensureVisible()

Created with <3 with dartpad.dev.

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatelessWidget {
  MyHomePage({super.key, required this.title});

  final String title;
  static const listItemCount = 25;
  final globalKeyFirst = GlobalKey();
  final globalKeyLast = GlobalKey();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(title),
      ),
      body: Center(
        child: SingleChildScrollView(
          child: Column(
            children: [
              for (var index in List<int>.generate(listItemCount, (j) => j + 1))
                Center(
                  key: index == 1 ? globalKeyFirst : (index == listItemCount ? globalKeyLast : null),
                  child: Padding(
                    padding: const EdgeInsets.symmetric(
                      vertical: 10,
                    ),
                    child: Card(
                      child: Text(
                        "This is item $index",
                        style: const TextStyle(fontSize: 28),
                      ),
                    ),
                  ),
                ),
            ],
          ),
        ),
      ),
      floatingActionButton: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          Padding(
            padding: const EdgeInsets.symmetric(vertical: 20),
            child: FloatingActionButton(
              onPressed: () {
                Scrollable.ensureVisible(globalKeyFirst.currentContext!);
              },
              child: const Icon(Icons.arrow_upward),
            ),
          ),
          Padding(
            padding: const EdgeInsets.symmetric(vertical: 20),
            child: FloatingActionButton(
              onPressed: () {
                Scrollable.ensureVisible(globalKeyLast.currentContext!);
              },
              child: const Icon(Icons.arrow_downward),
            ),
          ),
        ],
      ),
    );
  }
}