Flutter TextField border style and prompt text, Flutter input text TextField
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This article was first published on the WeChat public account (biglead), my big front-end career, and published in various technical forums simultaneously.
TextField series of articles
- The basic use of TextField and the common properties of TextField
- TextField focus acquisition control chapter "click to view details"
- TextField input text style TextStyle article "Click to view details"
- TextField input text textAlign alignment analysis chapter "click to view details"
- TextField input text decoration configure border style and prompt text analysis "click to view details"
- TextField TextEditingController Analysis "Click to View Details"
1 Introduction
1.1 Scenario 1
A text box is editable by default (allowing text input) and when it gets focus (text is being entered), there will be a default underline, and the color of this underline is the style in the textTheme theme configured by them in the obtained MaterialApp component.
1.2 Scenario 2
When this box is editable, but it does not get the focus (that is, when it is not inputting), there will also be a style as follows:
the effect different from scene 1 is that the style of the underline is different and there is no cursor
1.3 Scenario 3
In actual development, in some application scenarios, the text input box cannot enter text (by configuring enabled: false), TextFeild will also have different styles as follows:
Taken together, in the above scenarios, TextFeild has different responses in different states.
2 Customize the underline style and outer border style of TextFeild
Source code at a glance, detailed in the comments
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
/// Organization
//TextField input text decoration configure border style and prompt text analysis
class TextFeildHomePage5 extends StatefulWidget {
@override
State < StatefulWidget > createState ( ) {
return TextFeildHomePageState ( ) ;
}
}
class TextFeildHomePageState extends State {
///Used to control the acquisition and closing of the focus of TextField
FocusNode focusNode = new FocusNode ( ) ;
///Whether the text input box can be edited
bool isEnable = true ;
@override
void initState() {
super.initState();
///Add a concurrent focusNode for gaining focus and losing focus . addListener ( ( ) {
///Whether the current TextFeild has acquired the input focus
bool hasFocus = focusNode . hasFocus ;
///Whether the current focusNode has added a concurrent
bool hasListeners = focusNode . hasListeners ;
print("focusNode 兼听 hasFocus:$hasFocus hasListeners:$hasListeners");
});
/// WidgetsBinding It can monitor the completion of the first frame drawing, and the completion of the first frame drawing indicates that the build has been completed .
WidgetsBinding . instance . addPostFrameCallback ( ( _ ) {
///Get the focus of the input box
FocusScope . of ( context ) . requestFocus ( focusNode ) ;
} ) ;
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
actions: <Widget>[
FlatButton(child: Text("获取焦点"),onPressed: (){
FocusScope.of(context).requestFocus(focusNode);
},),
FlatButton ( child : Text ( "loses focus" ) , onPressed : ( ) {
focusNode . unfocus ( ) ;
} , ) ,
FlatButton ( child : Text ( "edit" ) , onPressed : ( ) {
setState ( ( ) {
isEnable = true ;
} ) ;
} ,) ,
FlatButton ( child : Text ( "not editable" ) , onPressed : ( ) {
setState ( ( ) {
isEnable = false ;
} ) ;
} , ) ,
] ,
) ,
body : Container (
///SizedBox is used to limit A space
child with a fixed width and height : SizedBox (
width : 400 ,
height : 130 ,
child : Container (
color : Colors . white24 ,
/// distance from the top
margin : EdgeInsets . only ( top : 30 ) ,
padding : EdgeInsets . all ( 10 ) ,
///Alignment is used to align Widget
alignment : Alignment ( 0 , 0 ) ,
///Text input box
child: TextField(
///Whether it can be edited
enabled : isEnable ,
///The focus gets
focusNode : focusNode ,
///The style used to configure the TextField
decoration : InputDecoration (
///Set the prompt text of the input text box
///The input box gets the focus When and no text is
entered hintText : "Please enter the user name" ,
///Set the style of the prompt text of the input text box
hintStyle : TextStyle ( color : Colors . grey , textBaseline : TextBaseline . ideographic , ) ,
///The prompt in the input box displays
labelText : "Username" ,
labelStyle : TextStyle ( color : Colors . blue ) when the input box does not get the focus ,
/// The text displayed under the input box
helperText : "Here is the help prompt "language" ,
helperStyle : TextStyle ( color : Colors . green ) ,
///The text displayed under the input box
/// will cover the helperText content
errorText : "This is the error text prompt" ,
errorStyle : TextStyle ( color : Colors . red ) ,
///The front of the input text will be displayed when the input box gets the focus
prefixText : "prefix" ,
prefixStyle : TextStyle ( color : Colors . deepPurple ) ,
///The input box will only be displayed when the input box gets the focus The back of the input text
suffixText : "suf " ,
suffixStyle : TextStyle ( color : Colors . black ) ,
///The text displayed in the lower right corner of the text input box
///The text counter defaults to
counterText : "count" ,
counterStyle : TextStyle ( color : Colors . deepPurple [ 800 ] ) ,
///Small icon before input text
prefixIcon : Icon ( Icons . phone ) ,
/// Small icon after input text
suffixIcon : Icon ( Icons . close ) ,
/// Cannot be set at the same time with prefixText
// prefix: Text("A") ,
/// Cannot be set at the same time as suffixText
// suffix: Text("B") ,
/// Set border
/// InputBorder.none None Underline
/// OutlineInputBorder has borders on top, bottom, left and right
/// UnderlineInputBorder only the bottom border uses the bottom border by default
border : OutlineInputBorder (
///Set the radians of the four corners of the border
borderRadius : BorderRadius . all ( Radius . circular ( 10 ) ) ,
///The style used to configure the border
borderSide : BorderSide (
///Set the color of the border
color : Colors . red ,
///Set the thickness of the border
width : 2.0 ,
) ,
) ,
///Set the border style when the input box is editable
enabledBorder : OutlineInputBorder (
///Set the radian of the four corners of the border
borderRadius : BorderRadius .all ( Radius . circular ( 10 ) ) , ///The style used to configure the border
borderSide : BorderSide ( /// Set the color of the border
color : Colors . blue ,
///Set the thickness of the border
width : 2.0 ,
) ,
) ,
disabledBorder : OutlineInputBorder (
///Set the radians of the four corners of the border
borderRadius : BorderRadius . all ( Radius . circular ( 10 ) ) ,
/ //The style used to configure the border
borderSide : BorderSide (
///Set the color of the border
color :Colors . red ,
///Set the thickness of the border
width : 2.0 ,
) ,
) ,
///Used to configure the color of the input box when it gets the focus
focusedBorder : OutlineInputBorder (
///Set the radians of the four corners of the border
borderRadius : BorderRadius . all ( Radius . circular ( 20 ) ) ,
///The style used to configure the border
borderSide : BorderSide (
/// Set the color of the border
color : Colors.green ,
/// Set the thickness of the border
width : 2.0 ,
) ,
) ,
) ,
) ,
) ,
) ,
) ,
) ;
}
}
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