用户点击时如何更改文本颜色?Flutter-Firestore-StreamBuilder [英] How to change the text color when the user tap on it ? Flutter - Firestore - StreamBuilder
本文介绍了用户点击时如何更改文本颜色?Flutter-Firestore-StreamBuilder的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我在Flustore上使用Flutter来收集选票,而我在UI方面很挣扎.我想要的是,当用户点击选项时,文本或边框上的内容会发生变化...
I use Flutter with firestore to collect votes, and I'm struggling with UI. What I want is when the user tap on the option, something change on the text or the border ...
要添加更多信息,这是我的代码:
To add more information, this is my code:
Widget _buildListItem(BuildContext context, DocumentSnapshot document) {
return ListTile(
title: Container(
margin: EdgeInsets.all(8.0),
padding: EdgeInsets.fromLTRB(210, 0.0, 0.0, 0.0),
decoration: BoxDecoration(
color: Colors.white,
border: Border.all(
color: Colors.pink[800], // set border color
width: 3.0), // set border width
borderRadius: BorderRadius.all(
Radius.circular(10.0)), // set rounded corner radius
boxShadow: [
BoxShadow(
blurRadius: 5,
color: Colors.black,
offset: Offset(0.5, 1))
] // make rounded corner of border
),
child: Row(
children: <Widget>[
Container(
child: Text(
document['rep'],
style: TextStyle(
fontSize: 50.0,
color: Colors.black,
),
),
),
]
),
),
onTap: () {
Firestore.instance.runTransaction(
(transaction) async {
DocumentSnapshot freshSnap =
await transaction.get(document.reference);
await transaction.update(freshSnap.reference, {
'votes': freshSnap['votes'] + 1,
});
});
},
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: StreamBuilder(
stream: Firestore.instance.collection('questions').snapshots(),
builder: (context, snapshot) {
if (!snapshot.hasData) return const Text('Loading ...');
return ListView.builder(
padding: EdgeInsets.fromLTRB(50.0, 300.0, 50.0, 0.0),
itemExtent: 100.0,
itemCount: snapshot.data.documents.length,
itemBuilder: (context, index) =>
_buildListItem(context, snapshot.data.documents[index]),
);
}),
floatingActionButton: FloatingActionButton(
onPressed: () {
Navigator.push(
context, MaterialPageRoute(builder: (context) => new Home()));
},
child: Text("Home"),
),
);
}
推荐答案
尝试以下操作:
int selectedItem = -1;//添加您的状态
int selectedItem = -1; //add in your state
在您的列表中添加以下内容:
In your list add following :
selectedItem == index
? Container(color: Colors.white)
: Container(color: Colors.red));
在
onTap: () {
setState(() {
selectedItem = selectedIndex;
});
}
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