短视频商城源码，Flutter 漂亮的搜索框密码框实现的相关代码

```handlebars
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';


const Color _textColor = Colors.black;
const TextStyle _textStyle = TextStyle(fontSize: 15.0,color: _textColor);
const TextStyle _hintTextStyle = TextStyle(fontSize: 15.0,color: Color(0xFFBBBBBB));

typedef _InputCallBack = void Function(String value);

class SearchPwdTextField extends StatefulWidget {

final String text;
final String hintText;
final String labelText;//top提示文字
final TextEditingController controller;
final TextInputType keyboardType;
final FocusNode focusNode;
final bool isPwd; //是否是密码，默认不是
final Widget leftWidget; //左侧widget ，默认隐藏
final Widget rightWidget; //右侧widget ，默认隐藏
final int maxLength; //最大长度，默认20
final bool isShowDeleteBtn; //是否显示右侧删除按钮，默认不显示
final List<TextInputFormatter> inputFormatters;
final _InputCallBack inputCallBack;
final String pwdOpen; //自定义密码图片路径 睁眼
final String pwdClose;//自定义密码图片路径 闭眼
final InputBorder border; //边框样式
final bool isDense; //是否紧凑显示，默认false


const SearchPwdTextField({
Key key,
this.text: '',
this.keyboardType: TextInputType.text,
this.hintText: '',
this.labelText,
this.controller,
this.focusNode,
this.isPwd = false,
this.leftWidget,
this.rightWidget,
this.maxLength:20,
this.isShowDeleteBtn = false,
this.inputFormatters,
this.inputCallBack,
this.pwdOpen,
this.pwdClose,
this.border,
this.isDense:false,

}): super(key: key);

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

class _SearchPwdTextFieldState extends State<SearchPwdTextField> {


TextEditingController _textController;
FocusNode _focusNode;
bool _isShowDelete;
bool _isHideenPwdBtn; //是否隐藏 右侧密码明文切换按钮 ，密码样式才显示（isPwd =true），
bool _pwdShow; //控制密码 明文切换
Widget _pwdImg; //自定义密码图片
bool _isShowRight=false;

@override
void initState() {
// TODO: implement initState
super.initState();

_textController = widget.controller!=null ? widget.controller : TextEditingController();
_textController.text = widget.text;
_focusNode = widget.focusNode !=null ?widget.focusNode : FocusNode();
_isHideenPwdBtn = !widget.isPwd ;
_pwdShow = widget.isPwd;

_isShowDelete = _focusNode.hasFocus && _textController.text.isNotEmpty;
_textController.addListener(() {
setState(() {
_isShowDelete = _textController.text.isNotEmpty &&_focusNode.hasFocus;
});
});
_focusNode.addListener(() {
setState(() {
_isShowDelete = _textController.text.isNotEmpty &&_focusNode.hasFocus;
});
});

}

@override
Widget build(BuildContext context) {

if(widget.pwdOpen!=null && widget.pwdClose!=null){
if(widget.pwdOpen.isNotEmpty && widget.pwdClose.isNotEmpty){
_pwdImg = _pwdShow ? ImageIcon(AssetImage(widget.pwdClose)):ImageIcon(AssetImage(widget.pwdOpen)) ;
}else{
_pwdImg = Icon(_pwdShow ? Icons.visibility_off : Icons.visibility);
}
}else{
_pwdImg = Icon(_pwdShow ? Icons.visibility_off : Icons.visibility);
// _pwdImg = _pwdShow?Image.asset("assets/images/ic_pwd_close.png",width: 18.0,):Image.asset("assets/images/ic_pwd_open.png",width: 18.0,);
// _pwdImg = _pwdShow?ImageIcon(AssetImage("assets/images/ic_pwd_close.png")):ImageIcon(AssetImage("assets/images/ic_pwd_open.png")) ;
}

return

Stack(
alignment: Alignment.centerRight,
children: <Widget>[

TextField(
focusNode: _focusNode,
controller: _textController,
keyboardType: widget.keyboardType,
style: _textStyle,
// // 数字、手机号限制格式为0到9(白名单)， 密码限制不包含汉字（黑名单）
// inputFormatters: (widget.keyboardType == TextInputType.number || widget.keyboardType == TextInputType.phone) ?
// [WhitelistingTextInputFormatter(RegExp('[0-9]'))] : [BlacklistingTextInputFormatter(RegExp('[\u4e00-\u9fa5]'))],
inputFormatters: widget.inputFormatters!=null ?widget.inputFormatters:[LengthLimitingTextInputFormatter(widget.maxLength)],
decoration: InputDecoration(
prefixIcon: widget.leftWidget,
labelText: widget.labelText!= null ?widget.labelText: null,
hintText: widget.hintText,
hintStyle: _hintTextStyle,
isDense: widget.isDense,
enabledBorder: widget.border!=null?widget.border: UnderlineInputBorder(borderSide: BorderSide(color: Colors.grey, width: 0.8)),
focusedBorder: widget.border!=null?widget.border: UnderlineInputBorder(borderSide: BorderSide(color: Theme.of(context).primaryColor, width: 0.8)),
// suffixIcon:
),
obscureText: _pwdShow,
onChanged: (value){

if(widget.inputCallBack!=null){
_isShowRight=value.isNotEmpty;
widget.inputCallBack(_textController.text);
}
},
),

Row(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Offstage(offstage: !widget.isShowDeleteBtn, child:
_isShowDelete
? IconButton(icon: Icon(Icons.cancel,color: Color(0xFFC8C8C8),size: 20,),
onPressed: (){
_textController.text = "";
if(widget.inputCallBack!=null){
_isShowRight=_textController.text.isNotEmpty;
widget.inputCallBack(_textController.text);
}
}
): Text(""),
),
Offstage( offstage: _isHideenPwdBtn, child:
IconButton(
// icon: Icon(_pwdShow ? Icons.visibility_off : Icons.visibility),
// icon: Image.asset("assets/images/ic_pwd_close.png",width: 18.0,),
icon: _pwdImg,
iconSize: 18.0 ,
onPressed: () {
setState(() {
_pwdShow = !_pwdShow;
});
},
)
),
widget.rightWidget!=null&&_isShowRight?widget.rightWidget:Container(),
],
),
],
);


//以下代码添加右侧自定义widget点击会弹出键盘


TextField(
focusNode: _focusNode,
controller: _textController,
keyboardType: widget.keyboardType,
style: _textStyle,
inputFormatters: widget.inputFormatters!=null ?widget.inputFormatters:[LengthLimitingTextInputFormatter(20)],
decoration: InputDecoration(
hintText: widget.hintText,
hintStyle: _hintTextStyle,
focusedBorder: UnderlineInputBorder(borderSide: BorderSide(color: Theme.of(context).primaryColor, width: 0.8)),
enabledBorder: UnderlineInputBorder(borderSide: BorderSide(color: Colors.grey,width: 0.5)),
prefixIcon: widget.leftWidget,
suffixIcon:
Container(
child: Row(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Offstage(offstage: !widget.isShowDeleteBtn, child:
_isShowDelete
? IconButton(icon: Icon(Icons.cancel,color: Color(0xFFC8C8C8),size: 20,),
onPressed: (){
_textController.text = "";
if(widget.inputCallBack!=null){
widget.inputCallBack(_textController.text);
}
}
): Text(""),
),
Offstage( offstage: _isHideenPwdBtn, child:
IconButton(
// icon: Icon(_pwdShow ? Icons.visibility_off : Icons.visibility),
// icon: Image.asset("assets/images/ic_pwd_close.png",width: 18.0,),
icon: _pwdImg,
iconSize: 18.0 ,
onPressed: () {
setState(() {
_pwdShow = !_pwdShow;
});
},
)
),
widget.rightWidget!=null?widget.rightWidget:Container(),

],
),
),
),
obscureText: _pwdShow,
onChanged: (value){`在这里插入代码片`
if(widget.inputCallBack!=null){
widget.inputCallBack(_textController.text);
}
},
);


}
}
```

 

使用

```handlebars
SearchPwdTextField(
leftWidget: Icon(Icons.search, size: 25),
hintText: '搜索想要的资源',
isShowDeleteBtn: true,
isDense: true,
border: InputBorder.none,
rightWidget: Container(
margin: EdgeInsets.only(right: 12),
child: RawChip(
onPressed: () {
_onRefresh();
},
label: Text(
"搜索",
style: TextStyle(color: Colors.white),
),
backgroundColor: Colors.orangeAccent),
),
inputCallBack: (value) {

setState(() {
_search=value;
});
//删除关键字的时候也要刷新
if(_search.isEmpty){
_onRefresh();
}

},
),
),
```

 

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