super_clipboard 0.8.0-dev.3

Comprehensive clipboard access package for Flutter. Supports reading and writing of rich text, images and other formats.

example/lib/main.dart

import 'dart:ui' as ui;
import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:super_clipboard/super_clipboard.dart';
import 'package:flutter_layout_grid/flutter_layout_grid.dart';

import 'widget_for_reader.dart';

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

const _notAvailableMessage =
    'Clipboard is not available on this platform. Use ClipboardEvents API instead.';

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'SuperClipboard Example',
      theme: ThemeData(
        snackBarTheme: const SnackBarThemeData(
          behavior: SnackBarBehavior.floating,
        ),
        outlinedButtonTheme: OutlinedButtonThemeData(
          style: OutlinedButton.styleFrom(
              padding:
                  const EdgeInsets.symmetric(horizontal: 10, vertical: 16)),
        ),
        primarySwatch: Colors.blue,
        useMaterial3: false,
      ),
      home: const MyHomePage(title: 'SuperClipboard Example'),
    );
  }
}

class Expand extends SingleChildRenderObjectWidget {
  const Expand({super.key, required super.child});

  @override
  RenderObject createRenderObject(BuildContext context) => _RenderExpanded();
}

class _RenderExpanded extends RenderProxyBox {
  @override
  void layout(Constraints constraints, {bool parentUsesSize = false}) {
    final boxConstraints = constraints as BoxConstraints;
    super.layout(
        boxConstraints.tighten(
          width: boxConstraints.maxWidth,
          height: boxConstraints.maxHeight,
        ),
        parentUsesSize: parentUsesSize);
  }
}

class HomeLayout extends StatelessWidget {
  const HomeLayout({
    super.key,
    required this.mainContent,
    required this.buttons,
  });

  final List<Widget> mainContent;
  final List<Widget> buttons;

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(builder: (context, constraints) {
      if (constraints.maxWidth < 540) {
        return ListView(
          padding: const EdgeInsets.all(16),
          children: [
            LayoutGrid(
              autoPlacement: AutoPlacement.rowDense,
              columnSizes: [1.5.fr, 2.fr],
              rowSizes: const [auto, auto, auto, auto],
              gridFit: GridFit.expand,
              rowGap: 10,
              columnGap: 10,
              children: buttons.map((e) => Expand(child: e)).toList(),
            ),
            const SizedBox(height: 16),
            ...mainContent,
          ],
        );
      } else {
        return Row(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            SingleChildScrollView(
              child: Padding(
                padding: const EdgeInsets.all(16),
                child: IntrinsicWidth(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.stretch,
                    children: buttons
                        .intersperse(const SizedBox(height: 10))
                        .toList(growable: false),
                  ),
                ),
              ),
            ),
            VerticalDivider(
              color: Colors.blueGrey.shade100,
              thickness: 1,
              width: 1,
            ),
            Expanded(
              child: ListView(
                padding: const EdgeInsets.all(16),
                children: mainContent,
              ),
            )
          ],
        );
      }
    });
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage>
    with SingleTickerProviderStateMixin {
  void showMessage(String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(message),
        duration: const Duration(milliseconds: 1500),
      ),
    );
  }

  @override
  void initState() {
    super.initState();
    ClipboardEvents.instance?.registerPasteEventListener(_onPasteEvent);
    ClipboardEvents.instance?.registerCopyEventListener(_onCopyEvent);
  }

  @override
  void dispose() {
    super.dispose();
    ClipboardEvents.instance?.unregisterPasteEventListener(_onPasteEvent);
    ClipboardEvents.instance?.unregisterCopyEventListener(_onCopyEvent);
  }

  void copyText() async {
    final clipboard = SystemClipboard.instance;
    if (clipboard != null) {
      final item = DataWriterItem();
      item.add(Formats.htmlText('<b>This is a <em>HTML</en> value</b>.'));
      item.add(Formats.plainText('This is a plaintext value.'));
      await clipboard.write([item]);
    } else {
      showMessage(_notAvailableMessage);
    }
  }

  void copyTextLazy() async {
    final clipboard = SystemClipboard.instance;
    if (clipboard != null) {
      final item = DataWriterItem();
      item.add(Formats.htmlText.lazy(() {
        showMessage('Lazy rich text requested.');
        return '<b>This is a <em>HTML</en> value</b> generated <u>on demand</u>.';
      }));
      item.add(Formats.plainText.lazy(() {
        showMessage('Lazy plain text requested.');
        return 'This is a plaintext value generated on demand.';
      }));
      await clipboard.write([item]);
    } else {
      showMessage(_notAvailableMessage);
    }
  }

  void copyImage() async {
    final clipboard = SystemClipboard.instance;
    if (clipboard != null) {
      final image = await createImageData(Colors.red);
      final item = DataWriterItem(suggestedName: 'RedCircle.png');
      item.add(Formats.png(image));
      await clipboard.write([item]);
    } else {
      showMessage(_notAvailableMessage);
    }
  }

  void copyImageLazy() async {
    final clipboard = SystemClipboard.instance;
    if (clipboard != null) {
      final item = DataWriterItem(suggestedName: 'BlueCircle.png');
      item.add(Formats.png.lazy(() {
        showMessage('Lazy image requested.');
        return createImageData(Colors.blue);
      }));
      await clipboard.write([item]);
    } else {
      showMessage(_notAvailableMessage);
    }
  }

  void copyCustomData() async {
    final clipboard = SystemClipboard.instance;
    if (clipboard != null) {
      final item = DataWriterItem();
      item.add(formatCustom(Uint8List.fromList([1, 2, 3, 4])));
      await clipboard.write([item]);
    } else {
      showMessage(_notAvailableMessage);
    }
  }

  void copyCustomDataLazy() async {
    final clipboard = SystemClipboard.instance;
    if (clipboard != null) {
      final item = DataWriterItem();
      item.add(formatCustom.lazy(() async {
        showMessage('Lazy custom data requested.');
        return Uint8List.fromList([1, 2, 3, 4, 5, 6]);
      }));
      await clipboard.write([item]);
    } else {
      showMessage(_notAvailableMessage);
    }
  }

  void copyUri() async {
    final clipboard = SystemClipboard.instance;
    if (clipboard != null) {
      final item = DataWriterItem();
      item.add(Formats.uri(NamedUri(
          Uri.parse('https://github.com/superlistapp/super_native_extensions'),
          name: 'Super Native Extensions')));
      await clipboard.write([item]);
    } else {
      showMessage(_notAvailableMessage);
    }
  }

  void _paste(ClipboardReader reader) async {
    final readers = await Future.wait(
      reader.items.map((e) => ReaderInfo.fromReader(e)),
    );
    if (!mounted) {
      return;
    }
    buildWidgetsForReaders(context, readers, (widgets) {
      setState(() {
        contentWidgets = widgets;
      });
    });
  }

  void _onPasteEvent(ClipboardReadEvent event) async {
    _paste(await event.getClipboardReader());
  }

  int i = 0;

  void _onCopyEvent(ClipboardWriteEvent event) {
    final item = DataWriterItem();
    item.add(Formats.plainText.lazy(() => 'This is a plaintext value. ${++i}'));
    // final image = await createImageData(Colors.red);
    // item.add(Formats.png(image));
    event.write([item]);
  }

  var contentWidgets = <Widget>[];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: HomeLayout(
        mainContent: contentWidgets
            .intersperse(const SizedBox(height: 10))
            .toList(growable: false),
        buttons: [
          OutlinedButton(
            onPressed: copyText,
            child: const Text('Copy Text'),
          ),
          OutlinedButton(
              onPressed: copyTextLazy, child: const Text('Copy Text - Lazy')),
          OutlinedButton(onPressed: copyImage, child: const Text('Copy Image')),
          OutlinedButton(
              onPressed: copyImageLazy, child: const Text('Copy Image - Lazy')),
          OutlinedButton(
              onPressed: copyCustomData, child: const Text('Copy Custom')),
          OutlinedButton(
              onPressed: copyCustomDataLazy,
              child: const Text('Copy Custom - Lazy')),
          OutlinedButton(onPressed: copyUri, child: const Text('Copy URI')),
          OutlinedButton(
              onPressed: () async {
                final clipboard = SystemClipboard.instance;
                if (clipboard != null) {
                  final reader = await clipboard.read();
                  _paste(reader);
                } else {
                  showMessage(_notAvailableMessage);
                }
              },
              style: OutlinedButton.styleFrom(
                backgroundColor: Colors.blue.shade600,
                foregroundColor: Colors.white,
              ),
              child: const Text('Paste')),
        ],
      ),
    );
  }
}

Future<Uint8List> createImageData(Color color) async {
  final recorder = ui.PictureRecorder();
  final canvas = Canvas(recorder);
  final paint = Paint()..color = color;
  canvas.drawOval(const Rect.fromLTWH(0, 0, 200, 200), paint);
  final picture = recorder.endRecording();
  final image = await picture.toImage(200, 200);
  final data = await image.toByteData(format: ui.ImageByteFormat.png);
  return data!.buffer.asUint8List();
}