lesson_page.dart
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import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:wow_english/common/extension/string_extension.dart';
import 'package:wow_english/common/widgets/we_app_bar.dart';
import 'package:wow_english/models/course_module_entity.dart';
import 'package:wow_english/route/route.dart';
import 'bloc/lesson_bloc.dart';
import 'widgets/lesson_item_widget.dart';
class LessonPage extends StatelessWidget {
const LessonPage({super.key, this.starPageIndex});
final int? starPageIndex;
@override
Widget build(BuildContext context) {
return BlocProvider(
create: (context) => LessonBloc(
starPageIndex??0,
PageController(
initialPage: starPageIndex??0,
viewportFraction: 0.3
),
)..add(RequestDataEvent()),
child: _LessonPageView(),
);
}
}
class _LessonPageView extends StatelessWidget {
final double _cardHeight = 240.h;
final double _scale = 0.8;
@override
Widget build(BuildContext context) {
return BlocListener<LessonBloc,LessonState>(
listener: (context, state){},
child: Scaffold(
appBar: WEAppBar(
leading: IconButton(
onPressed: (){
Navigator.pop(context);
},
icon: Image.asset(
'back'.assetPng,
height: 43,
width: 43,
)
),
// actions: <Widget>[
// IconButton(
// icon: Image.asset('shop'.assetPng),
// color: Colors.white,
// onPressed: () {
// showToast('购买');
// },
// )
// ],
),
body: _lessViewWidget(),
),
);
}
Widget _lessViewWidget() => BlocBuilder<LessonBloc,LessonState>(
builder: (context, state){
final bloc = BlocProvider.of<LessonBloc>(context);
return Center(
child: SafeArea(
child: Column(
children: [
SizedBox(
height: _cardHeight,
child: PageView.builder(
itemCount: bloc.listData.length,
controller: bloc.pageController,
onPageChanged: (int index) {
bloc.add(PageViewChangeIndexEvent(index));
},
itemBuilder: (context,index) => _itemTransCard(index)
),
),
32.verticalSpace,
SizedBox(
height: 32.h,
width: 66.w * bloc.listData.length,
child: ListView.builder(
itemCount: bloc.listData.length,
scrollDirection: Axis.horizontal,
itemBuilder: (BuildContext context,int index){
return Container(
height: 32.h,
width: 66.w,
padding: const EdgeInsets.symmetric(horizontal: 5),
child: GestureDetector(
onTap: () {
if (index == bloc.currentPageIndex) {
return;
}
int mill = (index - bloc.currentPageIndex) > 0 ? 100 * (index - bloc.currentPageIndex):100 * (bloc.currentPageIndex-index);
bloc.pageController.animateToPage(index, duration: Duration(milliseconds: mill), curve: Curves.ease);
},
child: Container(
height: bloc.currentPageIndex == index ? 32:20,
decoration: BoxDecoration(
color: bloc.currentPageIndex == index ? Colors.red:Colors.white,
borderRadius: BorderRadius.circular(5.r),
border: Border.all(
width: 0.5,
color: Colors.black,
),
),
alignment: Alignment.center,
child: Text(
(index+1).toString(),
style: TextStyle(
color: bloc.currentPageIndex == index ? Colors.white:Colors.black
),
),
),
),
);
}),
)
],
),
),
);
});
Widget _itemTransCard(int index) => BlocBuilder<LessonBloc,LessonState>(
builder: (context, state) {
final bloc = BlocProvider.of<LessonBloc>(context);
Matrix4 matrix4 = Matrix4.identity();
if (index == bloc.currentPageIndex.floor()) {
//当前的item
double currScale = (1 - (bloc.currentPageIndex - index) * (1 - _scale)).toDouble();
var currTrans = _cardHeight * (1 - currScale) / 2;
matrix4 = Matrix4.diagonal3Values(1.0, currScale, 1.0)
..setTranslationRaw(0.0, currTrans, 0.0);
} else if (index == bloc.currentPageIndex.floor() + 1) {
//右边的item
var currScale = _scale + (bloc.currentPageIndex - index + 1) * (1 - _scale);
var currTrans = _cardHeight * (1 - currScale) / 2;
matrix4 = Matrix4.diagonal3Values(1.0, currScale, 1.0)
..setTranslationRaw(0.0, currTrans, 0.0);
} else if (index == bloc.currentPageIndex - 1) {
//左边
var currScale = (1 - (bloc.currentPageIndex - index) * (1 - _scale)).toDouble();
var currTrans = _cardHeight * (1 - currScale) / 2;
matrix4 = Matrix4.diagonal3Values(1.0, currScale, 1.0)
..setTranslationRaw(0.0, currTrans, 0.0);
} else {
//其他，不在屏幕显示的item
matrix4 = Matrix4.diagonal3Values(1.0, _scale, 1.0)
..setTranslationRaw(0.0, _cardHeight * (1 - _scale) / 2, 0.0);
}
CourseModuleEntity? model = bloc.listData[index];
return Transform(
transform: matrix4,
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 10),
child: LessonItemWidget(
model: model,
isSelected: bloc.currentPageIndex == index,
onClickEvent: () {
Navigator.of(context).pushNamedAndRemoveUntil(AppRouteName.home, (route) => false,arguments: {'moduleId':model?.id});
},
),
),
);
});
}