mouse_region.0.dart 2.16 KB
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// 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';

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/// Flutter code sample for [MouseRegion].

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void main() => runApp(const MouseRegionApp());
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class MouseRegionApp extends StatelessWidget {
  const MouseRegionApp({super.key});
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  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
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        appBar: AppBar(title: const Text('MouseRegion Sample')),
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        body: const Center(
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          child: MouseRegionExample(),
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        ),
      ),
    );
  }
}

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class MouseRegionExample extends StatefulWidget {
  const MouseRegionExample({super.key});
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  @override
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  State<MouseRegionExample> createState() => _MouseRegionExampleState();
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}

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class _MouseRegionExampleState extends State<MouseRegionExample> {
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  int _enterCounter = 0;
  int _exitCounter = 0;
  double x = 0.0;
  double y = 0.0;

  void _incrementEnter(PointerEvent details) {
    setState(() {
      _enterCounter++;
    });
  }

  void _incrementExit(PointerEvent details) {
    setState(() {
      _exitCounter++;
    });
  }

  void _updateLocation(PointerEvent details) {
    setState(() {
      x = details.position.dx;
      y = details.position.dy;
    });
  }

  @override
  Widget build(BuildContext context) {
    return ConstrainedBox(
      constraints: BoxConstraints.tight(const Size(300.0, 200.0)),
      child: MouseRegion(
        onEnter: _incrementEnter,
        onHover: _updateLocation,
        onExit: _incrementExit,
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        child: ColoredBox(
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          color: Colors.lightBlueAccent,
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
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              const Text('You have entered or exited this box this many times:'),
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              Text(
                '$_enterCounter Entries\n$_exitCounter Exits',
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                style: Theme.of(context).textTheme.headlineMedium,
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              ),
              Text(
                'The cursor is here: (${x.toStringAsFixed(2)}, ${y.toStringAsFixed(2)})',
              ),
            ],
          ),
        ),
      ),
    );
  }
}