在 flutter 中使用 StreamBuilder 在文本字段中键入时显示过滤记录

我已经为学习Firebase创建了一个简单的演示页面，

这里我有一个文本字段、搜索按钮和StreamBuilder，用于显示所有记录

我已经设置了一个条件，当文本字段为空时显示所有记录...

在这里，我使用了一个刚刚重新生成的按钮...只是在它内部按下了setState

一切都很好，但我只是想改善记录应该是过滤的同时在文本框上打字，这样就不需要按钮了.

如何在文本字段Change中调用StreamBuilder的流...此外，我还创建了CustomTextField，因此如何将函数作为onChange传递需要一个值...

以下是我的代码

Column(
          children: [
            SizedBox(
              height: 40,
            ),
            CustomTextField(
                hint: 'Search Email', controller: txtsearchcontroller),
            SizedBox(
              height: 20,
            ),
            CupertinoButton(
                child: Text('Search'),
                onPressed: () {
                  setState(() {});
                }),
            SizedBox(
              height: 30,
            ),
            StreamBuilder(
                stream: txtsearchcontroller.text == ''
                    ? FirebaseFirestore.instance
                        .collection('chatusers')
                        .snapshots()
                    : FirebaseFirestore.instance
                        .collection('chatusers')
                        .where(
                          "email",
                          isEqualTo: txtsearchcontroller.text,
                          isNotEqualTo: widget.usermodel.email,
                        )
                        .snapshots(),
                builder: (context, snapshot) {
                  if (snapshot.connectionState == ConnectionState.active) {
                    if (snapshot.hasData) {
                      QuerySnapshot querysnapshot =
                          snapshot.data as QuerySnapshot;
                      if (querysnapshot.docs.length > 0) {
                        //and suggest me if any better way instead of this following
                        List<Map<String, dynamic>> maplist = [];
                        for (int x = 0; x < querysnapshot.docs.length; x++) {
                          Map<String, dynamic> usermap = querysnapshot.docs[x]
                              .data() as Map<String, dynamic>;
                          maplist.add(usermap);
                        }

                        return Expanded(
                          child: CustomListView(maplist:maplist),
                        );
                      } else {
                        return Text('Has Data but No user Found');
                      }
                    } else {
                      if (snapshot.hasError) {
                        return Text('error found');
                      } else {
                        return Text('empty..');
                      }
                    }
                  } else {
                    return CircularProgressIndicator();
                  }
                }),

这是我的CustomTextfield

class CustomTextField extends StatelessWidget {

  final String hint;
  final bool isitpassword;
  final TextEditingController controller;
  const CustomTextField({Key? key,required this.hint,this.isitpassword=false,required this.controller}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 10.0),
      child: Container(
          padding: EdgeInsets.symmetric(horizontal: 20),
          decoration: BoxDecoration(
            color: Colors.grey,
            borderRadius: BorderRadius.circular(20),
          ),

          child: TextField(
            style: TextStyle(
              fontSize: 20,color: Colors.white,),

            controller: controller,
            obscureText: isitpassword,
            decoration: InputDecoration(

              border: InputBorder.none,
              hintText: hint,
              suffixIcon: IconButton(icon: Icon(Icons.close,color: Colors.white,),onPressed: (){
                controller.text='';
              },),

            ),
          )),
    );
  }
}