Index
main.dart
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import 'dart:typed_data'; import 'package:flutter/material.dart'; import 'package:flutter_colorpicker/flutter_colorpicker.dart'; import 'package:painter/painter.dart'; void main() => runApp(const MyApp()); class MyApp extends StatelessWidget { const MyApp({Key? key}) : super(key: key); @override Widget build(BuildContext context) { return MaterialApp( title: 'Painter Example', home: ExamplePage(), ); } } class ExamplePage extends StatefulWidget { @override _ExamplePageState createState() => _ExamplePageState(); } class _ExamplePageState extends State<ExamplePage> { bool _finished = false; PainterController _controller = _newController(); @override void initState() { super.initState(); } static PainterController _newController() { PainterController controller = PainterController(); controller.thickness = 5.0; controller.backgroundColor = Colors.transparent; return controller; } @override Widget build(BuildContext context) { List<Widget> actions; if (_finished) { actions = <Widget>[ IconButton( icon: const Icon(Icons.content_copy), tooltip: 'New Painting', onPressed: () => setState( () { _finished = false; _controller = _newController(); }, ), ), ]; } else { actions = <Widget>[ IconButton( icon: const Icon( Icons.undo, ), tooltip: 'Undo', onPressed: () { if (_controller.isEmpty) { showModalBottomSheet( context: context, builder: (BuildContext context) => const Text('Nothing to undo')); } else { _controller.undo(); } }, ), IconButton( icon: const Icon(Icons.delete), tooltip: 'Clear', onPressed: _controller.clear), IconButton( icon: const Icon(Icons.check), onPressed: () => _show(_controller.finish(), context)), ]; } return Scaffold( appBar: AppBar( title: const Text('Painter Example'), actions: actions, bottom: PreferredSize( preferredSize: Size(MediaQuery.of(context).size.width, 30.0), child: DrawBar(_controller), )), body: Center( child: AspectRatio( aspectRatio: 1.0, child: Stack( children: [ Image.asset("images/komugi.jpeg"), Painter(_controller), ], ), ), ), ); } void _show(PictureDetails picture, BuildContext context) { setState(() { _finished = true; }); Navigator.of(context).push( MaterialPageRoute( builder: (BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('View your image'), ), body: Container( alignment: Alignment.center, child: FutureBuilder<Uint8List>( future: picture.toPNG(), builder: (BuildContext context, AsyncSnapshot<Uint8List> snapshot) { switch (snapshot.connectionState) { case ConnectionState.done: if (snapshot.hasError) { return Text('Error: ${snapshot.error}'); } else { return Image.memory(snapshot.data!); } default: return const FractionallySizedBox( widthFactor: 0.1, alignment: Alignment.center, child: AspectRatio( aspectRatio: 1.0, child: CircularProgressIndicator(), ), ); } }, ), ), ); }, ), ); } } class DrawBar extends StatelessWidget { final PainterController _controller; DrawBar(this._controller); @override Widget build(BuildContext context) { return Row( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Flexible( child: StatefulBuilder( builder: (BuildContext context, StateSetter setState) { return Slider( value: _controller.thickness, onChanged: (double value) => setState( () { _controller.thickness = value; }, ), min: 1.0, max: 20.0, activeColor: Colors.transparent, ); }, ), ), StatefulBuilder( builder: (BuildContext context, StateSetter setState) { return RotatedBox( quarterTurns: _controller.eraseMode ? 2 : 0, child: IconButton( icon: const Icon(Icons.create), tooltip: '${_controller.eraseMode ? 'Disable' : 'Enable'} eraser', onPressed: () { setState( () { _controller.eraseMode = !_controller.eraseMode; }, ); }, ), ); }, ), ColorPickerButton(_controller, false), ColorPickerButton(_controller, true), ], ); } } class ColorPickerButton extends StatefulWidget { final PainterController _controller; final bool _background; ColorPickerButton(this._controller, this._background); @override _ColorPickerButtonState createState() => _ColorPickerButtonState(); } class _ColorPickerButtonState extends State<ColorPickerButton> { @override Widget build(BuildContext context) { return IconButton( icon: Icon(_iconData, color: _color), tooltip: widget._background ? 'Change background color' : 'Change draw color', onPressed: _pickColor); } void _pickColor() { Color pickerColor = _color; Navigator.of(context) .push( MaterialPageRoute( fullscreenDialog: true, builder: (BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('Pick color'), ), body: Container( alignment: Alignment.center, child: ColorPicker( pickerColor: pickerColor, onColorChanged: (Color c) => pickerColor = c, ), ), ); }, ), ) .then( (_) { setState( () { _color = pickerColor; }, ); }, ); } Color get _color => widget._background ? widget._controller.backgroundColor : widget._controller.drawColor; IconData get _iconData => widget._background ? Icons.format_color_fill : Icons.brush; set _color(Color color) { if (widget._background) { widget._controller.backgroundColor = color; } else { widget._controller.drawColor = color; } } } |
https://pub.dev/packages/painter
だいぶ更新されていないので、あまり使わない方がいいかもしれませんが、簡単に実装できる。
