import 'dart:convert' as convert; import 'dart:ui'; import 'package:cached_network_image/cached_network_image.dart'; import 'package:flutter/cupertino.dart'; import 'package:flutter/material.dart'; import 'package:zhiying_comm/zhiying_comm.dart'; class MineNavDelegate extends SliverPersistentHeaderDelegate { final Map data; double _height; Color _color; List _icons = List(); MineNavDelegate(this.data) : super() { _height = MediaQueryData.fromWindow(window).padding.top + 44; String d = data['data']; Map json = convert.jsonDecode(d); if (json.containsKey('app_bar_bg_color')) { _color = HexColor.fromHex(json['app_bar_bg_color']); } else { _color = Colors.amber; } if (json.containsKey('app_bar_icons')) { List icons = json['app_bar_icons']; _icons = icons.map((icon) { SkipModel model = SkipModel.fromJson(Map.from(icon)); return MineNavIcon(icon['icon'], model); }).toList(); } } @override Widget build( BuildContext context, double shrinkOffset, bool overlapsContent) { double percent = shrinkOffset / _height; return MineNav(_color.withOpacity(percent), _icons); } @override double get maxExtent => _height; @override double get minExtent => _height; @override bool shouldRebuild(SliverPersistentHeaderDelegate oldDelegate) => false; // 如果内容需要更新,设置为true } class MineNav extends StatelessWidget { final Color color; final List widgets; MineNav(this.color, this.widgets); @override Widget build(BuildContext context) { return Container( padding: EdgeInsets.only(left: 12, right: 12), color: color, child: Column( children: [ Expanded(child: Container()), Container( width: double.infinity, height: 44, child: Row( mainAxisAlignment: MainAxisAlignment.end, crossAxisAlignment: CrossAxisAlignment.center, children: this.widgets, ), ) ], )); } } class MineNavIcon extends StatelessWidget { final String imgUrl; final SkipModel skipModel; const MineNavIcon(this.imgUrl, this.skipModel, {Key key}) : super(key: key); @override Widget build(BuildContext context) { return GestureDetector(child: Container( width: 24, height: 24, margin: EdgeInsets.only(left: 6), child: CachedNetworkImage( imageUrl: imgUrl, ), ), onTap:() { RouterUtil.route(skipModel, skipModel.toJson(), context); }); } }