AI代码解释 class_PromptDemoPageStateextendsState<PromptDemoPage>{varcount=0;@overridevoidinitState(){super.initState();}@overridevoiddispose(){super.dispose();}// 自增操作increase(){setState(()=>count++);}// 自减操作decreas
Builder(builder: (context) => RaisedButton(onPressed: () => _changeValue(context), child: Text('修改当前值'))), ])) ]), // 当 SnackBar 弹出时,fab 会上移一段距离 floatingActionButton: Builder( builder: (context) => FloatingActionButton(onPressed: => _changeValue(context), child: Ico...
children: <Widget>[//SnackBar 需要提供一个包含 context,但是 context 不能是 Scaffold 节点下的 context,所以需要通过 Builder 包裹一层Builder(builder: (context) => RaisedButton(onPressed: () => _changeValue(context), child: Text('修改当前值'))), ])) ]),//当 SnackBar 弹出时,fab 会上移一...
items .map((item) => CheckboxListTile( value: _selectedItems.contains(item), title: Text(item), controlAffinity: ListTileControlAffinity.leading, onChanged: (isChecked) => _itemChange(item, isChecked!), )) .toList(), ), ), actions: [ TextButton( child: const Text('取消'), onPressed...
Plus, Flutter’s capabilities, such as a hot reload feature, allow for fast change implementation and experimenting, which leads to reduced expenses on development and testing. Faster time to market Flutter speeds up every step of the development process. It has pre-built widgets that help ...
[]; // This function is triggered when a checkbox is checked or unchecked void _itemChange(String itemValue, bool isSelected) { setState(() { if (isSelected) { _selectedItems.add(itemValue); } else { _selectedItems.remove(itemValue); } }); } // this function is called...
class _Page19PassByValueState extends State<Page19PassByValue> { @override Widget build(BuildContext context) { return Scaffold(appBar: AppBar(title: Text('PassByValue'),),body: DefaultTextStyle(style: TextStyle(fontSize: 30, color: Colors.black),child: Column(children: [Text(UserInfoWidget....
A Material carousel widget that presents a scrollable list of items, each of which can dynamically change size based on the chosen layout. Center Alignment block that centers its child within itself. Checkbox Form control that app users can set or clear to select one or more options from a ...
(value: _selectedItems.contains(item),title: Text(item),controlAffinity: ListTileControlAffinity.leading,onChanged: (isChecked) => _itemChange(item, isChecked!),)).toList(),),),actions: [TextButton(child: const Text('取消'),onPressed: _cancel,),ElevatedButton(child: const Text('确定'),...
String _errorText; /// 当前表单的值 T get value => _value; /// 获取当前错误信息 String get errorText => _errorText; /// 判断是否有错误 bool get hasError => _errorText != null; /// 验证数据是否有效 bool get isValid => widget.validator?.call(_value) == null; ...