Flutter：我可以在哪里添加 Text()

Question

我想点击屏幕，然后将背景颜色更改为随机颜色。它工作正常，但我想在屏幕中心添加文本，请帮助我。 也许有人有想法，谢谢！ 我尝试将多个孩子添加到 AnimatedContainer。 尝试在 GestureDetector 中添加文本，但无法正常工作

TopScreen.dart

import 'package:flutter/material.dart';

class TopScreen extends StatefulWidget {
  final Widget child; //child widget

  TopScreen({this.child});

  @override
  State createState() => _TopScreenState();

  static _TopScreenState of (BuildContext context) {
    assert(context != null);
    final _TopScreenState result = context.findAncestorStateOfType();
    return result;
  }
}

class _TopScreenState extends State<TopScreen> {
  Color _color = Colors.white;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: AnimatedContainer(
          child: widget.child,
          color: _color,
          duration: Duration(milliseconds: 500),
        ),
    );
  }

  void setColor(Color color) {
    this._color = color;
  }
}

main.dart

import 'dart:math';

import 'package:flutter/material.dart';
import 'package:solidsoftwaretest/TopScreen.dart';

void main() => runApp(MaterialApp(home: TopScreen(child: MainScreen())));

class MainScreen extends StatefulWidget {
  @override
  State createState() => _MainScreenState();
}

class _MainScreenState extends State<MainScreen> {

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
            onTap: () {
              TopScreen.of(context).setColor(Colors.primaries[Random().nextInt(Colors.primaries.length)]);
              TopScreen.of(context).setState(() {});
            },

    );
  } //build
}

UPD：如果我将子（文本）添加到 GestureDetector -gestureDetector 仅适用于文本。

class _MainScreenState extends State<MainScreen> {

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      child: Center(
        child: Text('Hey there!')
      ),
        onTap: () {
          TopScreen.of(context).setColor(Colors.primaries[Random().nextInt(Colors.primaries.length)]);
          TopScreen.of(context).setState(() {});
        }
    );
  } //build
}

Answer 1

您可以在Container 中添加Text 小部件并将其进一步包装在GestureDetector 中。为了使GestureDetector 作用于整个区域，给Container 一个透明颜色，如下所示：

return GestureDetector(
  onTap: () {
    TopScreen.of(context).setColor(Colors.primaries[Random().nextInt(Colors.primaries.length)]);
      TopScreen.of(context).setState(() {});
  },
  child: Container(
    color: Colors.transparent,
    alignment: Alignment.center,
    child: Text('Hey there'),
    ),
  );

希望对你有帮助

Answer 2

您应该可以在您的AnimatedContainer 中添加Column。 Column 将包含多个 Widgets。 我更新了代码以显示完整的示例。

ScaffoldColorCenterText60597839(
  child: Text('Bananas'),
)

---

class ScaffoldColorCenterText60597839 extends StatefulWidget {
  final Widget child;
  ScaffoldColorCenterText60597839({
    this.child
  });

  @override
  _ScaffoldColorCenterText60597839State createState() => _ScaffoldColorCenterText60597839State();
}

class _ScaffoldColorCenterText60597839State extends State<ScaffoldColorCenterText60597839> {
  Color _color = Colors.white;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: AnimatedContainer(
        child: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: <Widget>[
              widget.child,
              Text('A text widget')
            ],
          )
        ),
        color: _color,
        duration: Duration(milliseconds: 500),
      ),
    );
  }
}