flutter-获取点击按钮的位置

class KindaCodeDemo extends StatefulWidget {
  const KindaCodeDemo({Key? key}) : super(key: key);

  @override
  State<KindaCodeDemo> createState() => _KindaCodeDemoState();
}

class _KindaCodeDemoState extends State<KindaCodeDemo> {
  // the tap location
  Offset? _tapPosition;

  // 获取点击的位置
  void _getTapPosition(TapDownDetails details) async {
    final tapPosition = details.globalPosition;
    setState(() {
      _tapPosition = tapPosition;
    });
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTapDown: (details) => _getTapPosition(details),
      child: Scaffold(
        appBar: AppBar(title: const Text('KindaCode.com')),
        body: Padding(
          padding: const EdgeInsets.symmetric(vertical: 30, horizontal: 15),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Container(
                width: double.infinity,
                height: 200,
                color: Colors.blue,
                padding: const EdgeInsets.all(20),
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    // Display X coordinate of tap
                    Text(
                      'X: ${_tapPosition?.dx.toStringAsFixed(2) ?? "Tap Somewhere"}',
                      style: const TextStyle(fontSize: 36, color: Colors.white),
                    ),
                    const SizedBox(
                      height: 20,
                    ),
                    // Display Y coordinate of tap
                    Text(
                      'Y: ${_tapPosition?.dy.toStringAsFixed(2) ?? "Tap Somewhere"}',
                      style:
                          const TextStyle(fontSize: 36, color: Colors.yellow),
                    ),
                  ],
                ),
              ),

              // the action of getting tap location doesn't prevent user from interacting with other widgets like buttons, forms, etc.
              // the purpose of the button below is to demonstrate that
              const SizedBox(
                height: 30,
              ),
              ElevatedButton(
                  onPressed: () =>
                      ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
                        content: Text('Hi There'),
                      )),
                  child: const Text('A Useless Button')),
            ],
          ),
        ),
      ),
    );
  }
}