flutter/examples/texture/lib/main.dart

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

class TexturePage extends StatefulWidget {
  const TexturePage({super.key});

  @override
  State<TexturePage> createState() => _TexturePageState();
}

class _TexturePageState extends State<TexturePage> {
  static const int textureWidth = 300;
  static const int textureHeight = 300;
  static const MethodChannel channel =
      MethodChannel('samples.flutter.io/texture');
  final Future<int?> textureId =
      channel.invokeMethod('create', <int>[textureWidth, textureHeight]);

  // Set the color of the texture.
  Future<void> setColor(int r, int g, int b) async {
    await channel.invokeMethod('setColor', <int>[r, g, b]);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: const Text('Texture Example'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            FutureBuilder<int?>(
              future: textureId,
              builder: (BuildContext context, AsyncSnapshot<int?> snapshot) {
                if (snapshot.hasData) {
                  if (snapshot.data != null) {
                    return SizedBox(
                      width: textureWidth.toDouble(),
                      height: textureHeight.toDouble(),
                      child: Texture(textureId: snapshot.data!),
                    );
                  } else {
                    return const Text('Error creating texture');
                  }
                } else {
                  return const Text('Creating texture...');
                }
              },
            ),
            const SizedBox(height: 10),
            OutlinedButton(
                child: const Text('Flutter Navy'),
                onPressed: () => setColor(0x04, 0x2b, 0x59)),
            const SizedBox(height: 10),
            OutlinedButton(
                child: const Text('Flutter Blue'),
                onPressed: () => setColor(0x05, 0x53, 0xb1)),
            const SizedBox(height: 10),
            OutlinedButton(
                child: const Text('Flutter Sky'),
                onPressed: () => setColor(0x02, 0x7d, 0xfd)),
            const SizedBox(height: 10),
            OutlinedButton(
                child: const Text('Red'),
                onPressed: () => setColor(0xf2, 0x5d, 0x50)),
            const SizedBox(height: 10),
            OutlinedButton(
                child: const Text('Yellow'),
                onPressed: () => setColor(0xff, 0xf2, 0x75)),
            const SizedBox(height: 10),
            OutlinedButton(
                child: const Text('Purple'),
                onPressed: () => setColor(0x62, 0x00, 0xee)),
            const SizedBox(height: 10),
            OutlinedButton(
                child: const Text('Green'),
                onPressed: () => setColor(0x1c, 0xda, 0xc5)),
          ],
        ),
      ),
    );
  }
}

void main() {
  runApp(const MaterialApp(home: TexturePage()));
}