在Flutter中,可以使用条件语句来实现条件渲染子窗口小部件。以下是一种常见的方式: 1. 使用条件表达式: ```dart Widget build(BuildContext context) ...
GestureDetector( child: SizedBox( height: 50, width: 150, child: ElevatedButton( onPressed: openFiles, child: const Text("Upload PDF"), ), ), ), const SizedBox(height: 10), if (_filePath != null) Text('File Path: $_filePath') else const Text('No file selected'), const ...
Widget build(BuildContext context) { if (condition) { useMyHook(); } // ... } About hot-reloadSince hooks are obtained from their index, one may think that hot-reloads while refactoring will break the application.But worry not, a HookWidget overrides the default hot-reload behavior to ...
bottomNavigationBar: widget.bottomNavigationBar, bottomSheet: widget.bottomSheet, backgroundColor: widget.backgroundColor, resizeToAvoidBottomInset: widget.resizeToAvoidBottomInset, primary: widget.primary, drawerDragStartBehavior: widget.drawerDragStartBehavior, extendBody: widget.extendBody, extendBodyBehindAppBa...
Image in the RawImage widget is failing to load in golden widget testing #152601 commented on Mar 4, 2025 • 0 new comments Custom SystemUiMode.immersiveSticky required #164428 commented on Mar 4, 2025 • 0 new comments Improve error if `BoxDecoration` has both a circle shape and...
import 'package:flutter/material.dart';import 'dart:math' as math;class CustomClipperContainer extends StatelessWidget { final Widget child; const CustomClipperContainer({super.key, required this.child}); @override Widget build(BuildContext context) { return ClipRect( clipper: MyCustomClippe...
解决这个问题的方法是把这个逻辑从widget中提取出来,放到一个Provider中。 代码语言:javascript 代码运行次数:0 复制 Cloud Studio代码运行 final pageIndexProvider=StateProvider<int>((ref)=>0);// A provider which computes whether the user is allowed to go to the previous pagefinal canGoToPreviousPageProvi...
dropDownWidget: _buildConditionListWidget(_distanceSortConditions, (value) { _selectDistanceSortCondition = value; _dropDownHeaderItemStrings[2] = _selectDistanceSortCondition.name; _dropdownMenuController.hide(); setState(() {}); })),
原因是这个组件在路由切换的时候,都会重新渲染一份,所以动画肯定是没有的,无奈之下,就提取了一个公共页,采用分支逻辑hide/show,来做tab页面的切换 Scaffold( appBar: getAppBar(selectedIndex, context), body: getBody(selectedIndex, senseState), bottomNavigationBar: renderBottomNavigationBar( ...
> Duration(seconds: 1); if (widget.isTwiceBack && condition) { _lastTime = now; SmartDialog.showToast("再点一次退出"); return false; } return true; } } Flutter 1.x typedef ScaffoldParamVoidCallback = void Function(); class BaseScaffold extends StatefulWidget { const BaseScaffold({ ...