Flutter 之可以超出父空间的控件FittedBox

computerclass

于 2021-07-08 14:51:36 发布

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此代码示例展示了如何在Flutter中使用FittedBox组件，将图像填充到Container中。通常情况下，图像不会自动填充整个Container，但通过FittedBox和BoxFit.fill属性，可以实现图像自适应填充，达到拉伸和调整位置的效果。

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FittedBox组件可以在父空间中放大或调整位置

/// Flutter code sample for FittedBox

// In this example, the image is stretched to fill the entire [Container], which would
// not happen normally without using FittedBox.

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

/// This is the main application widget.
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        appBar: AppBar(title: const Text(_title)),
        body: const Center(
          child: MyStatelessWidget(),
        ),
      ),
    );
  }
}

/// This is the stateless widget that the main application instantiates.
class MyStatelessWidget extends StatelessWidget {
  const MyStatelessWidget({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      height: 400,
      width: 300,
      color: Colors.red,
      child: FittedBox(
        child: Image.network(
            'https://flutter.github.io/assets-for-api-docs/assets/widgets/owl-2.jpg'),
        fit: BoxFit.fill,
      ),
    );
  }
}