onSelected ValueChanged<T?>? 选中条目回调事件 menuHeight double 菜单高度 width double 输入框宽度 代码语言:javascript 代码运行次数:0 运行 AI代码解释 classDropdownMenuNode1extendsStatefulWidget{constDropdownMenuNode1({super.key});@override State<DropdownMenuNode1>createState()=>_DropdownMenuNode1State...
弹出菜单按钮 PopupMenu Button 弹出菜单按钮ー 它是一个按钮,当按下它时显示菜单,然后调用 onSelected 方法,菜单将被取消。这是因为选择了多个选项中的项。此按钮包含文本和图像。它将主要使用设置菜单列出所有选项。它有助于创造良好的用户体验。 // Initial Selected Value String dropdownvalue = 'Item 1' ; ...
items:[DropdownMenuItem(child:Text('语文'),value:'语文',),DropdownMenuItem(child:Text('数学'),value:'数学'),DropdownMenuItem(child:Text('英语'),value:'英语'),],onChanged:(value){setState((){_dropValue=value;});},);}
DropdownButton({Key key,@requiredthis.items,// 下拉选项列表this.selectedItemBuilder,// 选项 item 构造器this.value,// 选中内容this.hint,// 启动状态下默认内容this.disabledHint,// 禁用状态下默认内容@requiredthis.onChanged,// 选择 item 回调this.elevation=8,// 阴影高度this.style,// 选项列表 ite...
/1Down Arrow Icon icon:constIcon(Icons.keyboard_arrow_down) ,// Array list of itemsitems: items.map((Stringitems) {returnDropdownMenuItem( value: items, child: Text(items), )i }) . toList(),// After selecting the desired option, it will// change button value to selected valueonChang...
return DropdownMenuItem<String>( value: value, child: Text(value), ); }).toList(), onChanged: (String? newValue) { setState(() { _selectedItem = newValue!; }); }, hint: Text('请选择一个选项'), ), ); } } 1. 2.
String dropdownValue = list.first; @override Widget build(BuildContext context) { return DropdownMenu<String>( initialSelection: list.first, onSelected: (String? value) { // This is called when the user selects an item. setState(() { ...
DropdownMenuItem( child: Text("item2"), value: 2, onTap: () {}, ) ], value: selectedValue, // 按钮默认显示弹框列表的哪个 item,和 DropdownMenuItem 的 value 相对应 // 选了某个选项时触发 onChanged: (selected) { print("_MyHomePageState - build onChanged $selected"); ...
getSelectedItemOffset:()=>route.getItemOffset(route.selectedIndex)), ... } ... }returnACEDropdownButton<String>( value: dropdownValue, backgroundColor: Colors.green.withOpacity(0.8), onChanged:(StringnewValue)=>setState(()=>dropdownValue = newValue), ...
.map<DropdownMenuItem<String>>((String value) { return DropdownMenuItem<String>( value: value, child: Text(value), ); }).toList(), ), PopupMenuButton<String>( onSelected: (String result) { setState(() { _selectedValue = result; ...