Flutter/外部ライブラリ/colorpicker

colorpickerとは

色選択ライブラリ

公式

https://pub.dev/packages/flutter_colorpicker

準備

pubspec.yaml

dependencies:
  flutter_colorpicker: any

flutter packages get
flutter packages upgrade

サンプル

import 'package:flutter_colorpicker/flutter_colorpicker.dart';

// create some values
Color pickerColor = Color(0xff443a49);
Color currentColor = Color(0xff443a49);

// ValueChanged<Color> callback
void changeColor(Color color) {
  setState(() => pickerColor = color);
}

// raise the [showDialog] widget
showDialog(
  context: context,
  child: AlertDialog(
    title: const Text('Pick a color!'),
    content: SingleChildScrollView(
      child: ColorPicker(
        pickerColor: pickerColor,
        onColorChanged: changeColor,
        enableLabel: true,
        pickerAreaHeightPercent: 0.8,
      ),
      // Use Material color picker:
      //
      // child: MaterialPicker(
      //   pickerColor: pickerColor,
      //   onColorChanged: changeColor,
      //   enableLabel: true, // only on portrait mode
      // ),
      //
      // Use Block color picker:
      //
      // child: BlockPicker(
      //   pickerColor: currentColor,
      //   onColorChanged: changeColor,
      // ),
    ),
    actions: <Widget>[
      FlatButton(
        child: const Text('Got it'),
        onPressed: () {
          setState(() => currentColor = pickerColor);
          Navigator.of(context).pop();
        },
      ),
    ],
  ),
)