Modify:文件名称的大小写规范

lib/components/home_banner.dart

@@ -0,0 +1,140 @@
+import 'dart:async';
+import 'package:flutter/material.dart';
+import '../model/story.dart';
+
+class HomeBanner extends StatefulWidget {
+  final List<StoryModel> bannerStories;
+  final OnTapBannerItem onTap;
+
+  HomeBanner(this.bannerStories, this.onTap, {Key key})
+      :super(key: key);
+
+  @override
+  State<StatefulWidget> createState() {
+    return _BannerState();
+  }
+}
+
+class _BannerState extends State<HomeBanner> {
+  int virtualIndex = 0;
+  int realIndex = 1;
+  PageController controller;
+  Timer timer;
+
+  @override
+  void initState() {
+    super.initState();
+    controller = PageController(initialPage: realIndex);
+    timer = Timer.periodic(Duration(seconds: 5), (timer) { // 自动滚动
+      /// print(realIndex);
+      controller.animateToPage(realIndex + 1,
+          duration: Duration(milliseconds: 300),
+          curve: Curves.linear);
+    });
+  }
+
+  @override
+  void dispose() {
+    super.dispose();
+    controller.dispose();
+    timer.cancel();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      height: 226.0,
+      child: Stack(
+          alignment: Alignment.bottomCenter,
+          children: <Widget>[
+            PageView(
+              controller: controller,
+              onPageChanged: _onPageChanged,
+              children: _buildItems(),),
+            _buildIndicator(), // 下面的小点
+          ]),
+    );
+  }
+
+  List<Widget> _buildItems() { // 排列轮播数组
+    List<Widget> items = [];
+    if (widget.bannerStories.length > 0) {
+      // 头部添加一个尾部Item，模拟循环
+      items.add(
+          _buildItem(widget.bannerStories[widget.bannerStories.length - 1]));
+      // 正常添加Item
+      items.addAll(
+          widget.bannerStories.map((story) => _buildItem(story)).toList(
+              growable: false));
+      // 尾部
+      items.add(
+          _buildItem(widget.bannerStories[0]));
+    }
+    return items;
+  }
+
+  Widget _buildItem(StoryModel story) {
+    return GestureDetector(
+      onTap: () { // 按下
+        if (widget.onTap != null) {
+          widget.onTap(story);
+        }
+      },
+      child: Stack(
+        fit: StackFit.expand,
+        children: <Widget>[
+         Image.network(story.image, fit: BoxFit.cover),
+          _buildItemTitle(story.title), // 内容文字,大意
+        ],),);
+  }
+
+  Widget _buildItemTitle(String title) {
+    return Container(
+      decoration: BoxDecoration( /// 背景的渐变色
+        gradient: LinearGradient(
+          begin: Alignment.bottomCenter,
+          end: const Alignment(0.0, -0.8),
+          colors: [const Color(0xa0000000), Colors.transparent],
+        ),
+      ),
+      alignment: Alignment.bottomCenter,
+      child: Container(
+        margin: EdgeInsets.symmetric(vertical: 22.0, horizontal: 16.0),
+        child: Text(
+          title, style: TextStyle(color: Colors.white, fontSize: 18.0),),),
+    );
+  }
+
+  Widget _buildIndicator() {
+    List<Widget> indicators = [];
+    for (int i = 0; i < widget.bannerStories.length; i++) {
+      indicators.add(Container(
+          width: 6.0,
+          height: 6.0,
+          margin: EdgeInsets.symmetric(horizontal: 1.5, vertical: 10.0),
+          decoration: BoxDecoration(
+              shape: BoxShape.circle,
+              color: i == virtualIndex ? Colors.white : Colors.grey)));
+    }
+    return Row(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: indicators);
+  }
+
+  _onPageChanged(int index) {
+    realIndex = index;
+    int count = widget.bannerStories.length;
+    if (index == 0) {
+      virtualIndex = count - 1;
+      controller.jumpToPage(count);
+    } else if (index == count + 1) {
+      virtualIndex = 0;
+      controller.jumpToPage(1);
+    } else {
+      virtualIndex = index - 1;
+    }
+    setState(() {});
+  }
+}
+
+typedef void OnTapBannerItem(StoryModel story);