如何正确创建评分星条？

Question

我正在尝试为用户评分创建一个星条，下图来自 Play 商店以说明我要实现的目标：

我已经能够实现以下功能，正如您所看到的那样，但是当我查看我的代码时，我觉得必须有一个更聪明的方法来做到这一点，而真正令人讨厌的部分是@987654325 @hit area 稍微上移了一点，所以当你触摸实际的星星时，它不会注册为触摸事件（即：你必须瞄准高于按钮的位置才能注册你的触摸，这导致糟糕的用户体验）你可以通过在我点击任何星星时留意飞溅效果来检查我的意思：

var _myColorOne = Colors.grey;
  var _myColorTwo = Colors.grey;
  var _myColorThree = Colors.grey;
  var _myColorFour = Colors.grey;
  var _myColorFive = Colors.grey;


  @override
  Widget build(BuildContext context) {
    return new Scaffold(
     appBar: new AppBar(
       title: new Text("My Rating"),
     ),
      body:  new Center(
        child: new Container(
          height: 10.0,
          width: 500.0,
          child: new Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                new IconButton(icon: new Icon(Icons.star),
                  onPressed: ()=>setState((){
                    _myColorOne=Colors.orange;
                    _myColorTwo=null;
                    _myColorThree=null;
                    _myColorFour=null;
                    _myColorFive=null;
                }),color: _myColorOne,),
                new IconButton(icon: new Icon(Icons.star),
                  onPressed: ()=>setState((){
                    _myColorOne=Colors.orange;
                    _myColorTwo=Colors.orange;
                    _myColorThree=Colors.grey;
                    _myColorFour=Colors.grey;
                    _myColorFive=Colors.grey;
                }),color: _myColorTwo,),
                new IconButton(icon: new Icon(Icons.star), onPressed: ()=>setState((){
                  _myColorOne=Colors.orange;
                  _myColorTwo=Colors.orange;
                  _myColorThree=Colors.orange;
                  _myColorFour=Colors.grey;
                  _myColorFive=Colors.grey;
                }),color: _myColorThree,),
                new IconButton(icon: new Icon(Icons.star), onPressed: ()=>setState((){
                  _myColorOne=Colors.orange;
                  _myColorTwo=Colors.orange;
                  _myColorThree=Colors.orange;
                  _myColorFour=Colors.orange;
                  _myColorFive=Colors.grey;
                }),color: _myColorFour,),
                new IconButton(icon: new Icon(Icons.star), onPressed: ()=>setState((){
                  _myColorOne=Colors.orange;
                  _myColorTwo=Colors.orange;
                  _myColorThree=Colors.orange;
                  _myColorFour=Colors.orange;
                  _myColorFive=Colors.orange;
                }),color: _myColorFive,),
              ],

          ),
        ),
      ),
    );
  }

那么这里有什么更好的方法吗？

Answer 1

太多的重复和填充！呵呵

不管怎样，我就是这样做的。简单，可重复使用。 您可以在有点击和无点击的情况下使用它（无点击禁用波纹效果）。 半星也是。如果没有指定颜色，则使用原色填充星星。

typedef void RatingChangeCallback(double rating);

class StarRating extends StatelessWidget {
  final int starCount;
  final double rating;
  final RatingChangeCallback onRatingChanged;
  final Color color;

  StarRating({this.starCount = 5, this.rating = .0, this.onRatingChanged, this.color});

  Widget buildStar(BuildContext context, int index) {
    Icon icon;
    if (index >= rating) {
      icon = new Icon(
        Icons.star_border,
        color: Theme.of(context).buttonColor,
      );
    }
    else if (index > rating - 1 && index < rating) {
      icon = new Icon(
        Icons.star_half,
        color: color ?? Theme.of(context).primaryColor,
      );
    } else {
      icon = new Icon(
        Icons.star,
        color: color ?? Theme.of(context).primaryColor,
      );
    }
    return new InkResponse(
      onTap: onRatingChanged == null ? null : () => onRatingChanged(index + 1.0),
      child: icon,
    );
  }

  @override
  Widget build(BuildContext context) {
    return new Row(children: new List.generate(starCount, (index) => buildStar(context, index)));
  }
}

然后你可以像这样使用它：

class Test extends StatefulWidget {
  @override
  _TestState createState() => new _TestState();
}

class _TestState extends State<Test> {
  double rating = 3.5;

  @override
  Widget build(BuildContext context) {
    return new StarRating(
      rating: rating,
      onRatingChanged: (rating) => setState(() => this.rating = rating),
    );
  }
}

Answer 2

pub.dev 上有一个包可以轻松做到这一点。

检查这个 - https://pub.dev/packages/smooth_star_rating

完整示例

 import 'package:flutter/material.dart';
 import 'package:smooth_star_rating/smooth_star_rating.dart';

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

class MyApp extends StatefulWidget {
 @override
  _MyAppState createState() => _MyAppState();
}

 class _MyAppState extends State<MyApp> {
 var rating = 0.0;

 @override
 Widget build(BuildContext context) {
    return MaterialApp(
    title: 'Rating bar demo',
    theme: ThemeData(
    primarySwatch: Colors.green,
  ),
  debugShowCheckedModeBanner: false,
  home: Scaffold(
    body: Center(
        child: SmoothStarRating(
      rating: rating,
      size: 45,
      starCount: 5,
      onRatingChanged: (value) {
        setState(() {
          rating = value;
        });
      },
      )),
    ),
  );
 }
}

演示

Answer 3

另一个很好的选择是使用这个库：flutter_rating_bar。它实现良好、优雅且易于配置。

https://pub.dev/packages/flutter_rating_bar

例子：

RatingBar(
   initialRating: 3,
   minRating: 1,
   direction: Axis.horizontal,
   allowHalfRating: true,
   itemCount: 5,
   itemPadding: EdgeInsets.symmetric(horizontal: 4.0),
   itemBuilder: (context, _) => Icon(
     Icons.star,
     color: Colors.amber,
   ),
   onRatingUpdate: (rating) {
     print(rating);
   },
);

Answer 4

这是因为为行小部件指定的高度。仅检测到该高度的手势。删除高度将缩放行以适合子项，从而可以完美地检测到 IconButton 上的点击手势。

我认为我提出了一个更好的解决方案。

评级组件代码：

int _rating = 0;

void rate(int rating) {
  //Other actions based on rating such as api calls.
  setState(() {
    _rating = rating;
  });
}

@override
Widget build(BuildContext context) {
  return new Scaffold(
    appBar: new AppBar(
      title: new Text("My Rating"),
    ),
    body: new Center(
      child: new Container(
        width: 500.0,
        child: new Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            new GestureDetector(
              child: new Icon(
                Icons.star,
                color: _rating >= 1 ? Colors.orange : Colors.grey,
              ),
              onTap: () => rate(1),
            ),
            new GestureDetector(
              child: new Icon(
                Icons.star,
                color: _rating >= 2 ? Colors.orange : Colors.grey,
              ),
              onTap: () => rate(2),
            ),
            new GestureDetector(
              child: new Icon(
                Icons.star,
                color: _rating >= 3 ? Colors.orange : Colors.grey,
              ),
              onTap: () => rate(3),
            ),
            new GestureDetector(
              child: new Icon(
                Icons.star,
                color: _rating >= 4 ? Colors.orange : Colors.grey,
              ),
              onTap: () => rate(4),
            ),
            new GestureDetector(
              child: new Icon(
                Icons.star,
                color: _rating >= 5 ? Colors.orange : Colors.grey,
              ),
              onTap: () => rate(5),
            )
          ],
        ),
      ),
    ),
  );
}

如果您希望在问题中使用您的代码，那么 替换：

child: new Container(
      height: 10.0,
      width: 500.0,
      child: new Row(
          mainAxisAlignment: MainAxisAlignment.center,

与：

child: new Container(
      width: 500.0,
      child: new Row(
          mainAxisAlignment: MainAxisAlignment.center,

希望这有帮助！

Answer 5

A cool way of rating

class RatingButtons extends StatefulWidget {
  const RatingButtons({
    Key key,
    @required this.feedbackIcons,
  }) : super(key: key);

  final List<Widget> feedbackIcons;
//Here you can create a list of icons for rating or 
//you can pass the icon list while using this widget

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

class _RatingButtonsState extends State<RatingButtons> {
  int rating;

  @override
  Widget build(BuildContext context) {
    return Row(mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: [
      ...widget.feedbackIcons.map((icon) {
        return GestureDetector(
          child: rating == widget.feedbackIcons.indexOf(icon)
              ? CircleAvatar(
                  radius: 30,
                  backgroundColor: kThemeColor,
                  child: icon,
                )
              : icon,
          onTap: () {
            setState(() {
              rating = widget.feedbackIcons.indexOf(icon);
            });
          },
        );
      }).toList()
    ]);
  }
}

Answer 6

这是我的

List<bool> ratingStarStatus = <bool>[
true,
false,
false,
false,
false
];

int rating=1;

Widget addImage(String icon){
    return new Image.asset(
        icon,
        height: 25.0,
        width: 25.0,
    );
}

Widget addRatingImage(int index){
    return new InkWell(
        onTap: (){
            rating=index+1;
            reDrawRating(index);
        },
        child: addImage(ratingStarStatus[index]?Constant.iconStarEnable: Constant.iconStarDisable)
    );
}
void reDrawRating(int index){
    for(int i=0;i<5;i++){
        if(i<=index){
            setState(() {
                ratingStarStatus[i]=true;
            });
        }else{
            setState(() {
                ratingStarStatus[i]=false;
        });
        }
    }
}

Widget addRatingView(){
    var stars = <Widget>[];
    for (var i = 0; i < 5; i++) {
        var star = addRatingImage(i);
        var padding = new Padding(padding: const EdgeInsets.fromLTRB(0.0, 0.0, 12.0, 0.0));
        stars.add(star);
        stars.add(padding);
    }

    return new Row(
        crossAxisAlignment: CrossAxisAlignment.center,
        mainAxisAlignment: MainAxisAlignment.center,
        children: stars,
    );
}

调用addRatingView函数附加评分视图

Answer 7

如果有人也想显示文本，那么您可以使用这段代码。 该代码适用于 double 或 int 值，我从这里smoothStarRating 将其与 SmoothStarRating 小部件一起使用。这很好:) 如果觉得有用，请点赞这个答案。

Text(
    rate == 5.0
        ? 'Its 5'
        : ((rate < 5.0) & (rate > 3.0))
            ? 'Its 4'
            : ((rate < 4.0) & (rate > 2.0))
                ? 'Its 3'
                : ((rate < 3.0) & (rate > 1.0))
                    ? 'Its 2'
                    : ((rate < 2.0) & (rate > 0.0))
                        ? 'Its 1'
                        : 'Its0',
),

Answer 8

我尝试修改教程以创建交互式星级。以下是我使用循环和 onPressed 不需要 InkWell 的方法。

`class RatingsWidget extends StatefulWidget {
  @override
  _RatingsWidgetState createState() => _RatingsWidgetState();
}

class _RatingsWidgetState extends State<RatingsWidget> {
  int _rating = 0;

  @override
  Widget build(BuildContext context) {
    List<Widget> array = [];
    var filled = Colors.blue;
    var empty = Colors.black;
    for (var i = 1; i <= 5; i++) {
      array.add(IconButton(
        icon: Icon(Icons.star),
        color: (_rating < i ? empty : filled),
        onPressed: () {
          setState(() {
            _rating = i;
          });
        },
      ));
    }
    return Row(
      children: array,
      mainAxisAlignment: MainAxisAlignment.center,
    );
  }
}`