只是将isExpanded:true添加到DropdownButton
map<DropdownMenuEntry<int>>( (final int num) { return DropdownMenuEntry<int>( value: num, label: "$num" ); } ).toList(), ), ), ), Expanded( child: Center( child: DropdownMenu<double>( inputDecorationTheme: const InputDecorationTheme( helperMaxLines: 5, border: OutlineInputBorder(...
import'package:flutter/material.dart'; import'package:flutter_app/utils/CXColors.dart';classDropDownSelect extends StatelessWidget { final String label; String value; final List<DropdownMenuItem>items; final ValueChanged onChanged;boolisText; DropDownSelect({Key key,this.label,this.value,this.items,...
true为最大间距,false为默认hint:newText("请添加数据信息"),// 当没有初始值时显示value:"1",// 设置初始值,方便设置默认选项。并且DropdownMenuItem中的value要有该值,不然会报错//选中后的回调,根据自己的情况用Statefull或Provider管理状态onChanged:(selectValue){setState((){//此处的value是自定义的val...
Create DropdownMenuFormField #141941 commented on Dec 17, 2024 • 0 new comments Flutter web iframed doesn't take focus when clicking into it and receives no keyboard events #157387 commented on Dec 17, 2024 • 0 new comments Replace`SurfaceProducer.Callback.onSurfaceCreated` with ...
CheckedPopupMenuItem: DropdownMenuItem: PopupMenuBottom: PopupMenuDivider: PopopMenuEntry: PopupMenuItem: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. Pick类: DayPicker: MonthPicker: YearPicker: ShowdatePicker: ...
作为一个选项，您可以基于PopupMenuButton而不是常规DropdownButton构建它 下面是一个例子 ...
3. A classic desktop/web style dropdown menu: 4. A animated menu based on the Flow widget: For more details check out the full README if you find any issues, please let us know here. Hopefully this can free up your layouts and bit and help you, literally, break outside that ...
我试图将一个DropdownButton添加到我的应用程序中,但它没有呈现,出现了“底部被无穷大像素溢出”的消息,我尝试将其放入一个SizeBox、Paddign、ConstrainedBox、Row中,但是没有什么工作,请参见代码: @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar( title: new Text( ...
Flutter DropDownButton是一个下拉选择框的组件,用于在Flutter应用程序中创建一个可选择的列表。当用户点击下拉按钮时,会弹出一个列表,用户可以从中选择一个值。 问题描述中提到DropDownButton不显示选定的值,可能是由于以下几个原因导致的: 数据源问题:首先要确保DropDownButton的数据源正确设置。数据源应该是一个列表...