backup. before shop update

lib/widgets/general/carousel.dart

@@ -0,0 +1,146 @@
+import 'package:flutter/material.dart';
+import 'dart:async';
+
+import 'style.dart';
+
+class Carousel extends StatefulWidget {
+  Carousel({
+    double height = 200.0,
+    List<Widget> pages,
+    bool autoPlay,
+    Duration duration = const Duration(seconds: 2),
+    Duration animationDuration = const Duration(milliseconds: 1000),
+  })
+    : height = height,
+      pages = pages,
+      autoPlay = autoPlay,
+      duration = duration,
+      animationDuration = animationDuration;
+
+  final double height;
+  final List<Widget> pages;
+  final bool autoPlay;
+  final Duration duration;
+  final Duration animationDuration;
+
+  @override
+  createState() => new CarouselState();
+}
+
+class CarouselState extends State<Carousel> {
+  final _pageController = new PageController();
+
+  Timer _timer;
+  int _currentPage = 0;
+  bool reverse = false;
+  GlobalKey<IndicatorState> _indicatorStateKey = new GlobalKey();
+
+  @override
+  void initState() {
+    super.initState();
+    if (widget.autoPlay) {
+      _timer = new Timer.periodic(widget.duration, (timer) {
+        _pageController.animateToPage(_currentPage,
+            duration: widget.animationDuration, curve: Curves.linear);
+        if (!reverse) {
+          _currentPage += 1;
+          if (_currentPage == widget.pages.length) {
+            _currentPage -= 1;
+            reverse = true;
+          }
+        } else {
+          _currentPage -= 1;
+          if (_currentPage < 0) {
+            _currentPage += 1;
+            reverse = false;
+          }
+        }
+      });
+    }
+  }
+
+  @override
+  void dispose() {
+    _pageController?.dispose();
+    if (_timer != null) {
+      _timer.cancel();
+    }
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return new Stack(
+      children: <Widget>[
+        new Container(
+          height: widget.height,
+          color: Style.backgroundColor,
+          child: new PageView(
+            controller: _pageController,
+            children: widget.pages,
+            onPageChanged: (index) {
+              _currentPage = index;
+              _indicatorStateKey.currentState.changeIndex(index);
+            },
+          ),
+        ),
+        new Positioned(
+          left: 0.0,
+          right: 0.0,
+          bottom: 0.0,
+          child: new Align(
+            child: new Indicator(
+              key: _indicatorStateKey,
+              count: widget.pages.length,
+            ),
+            alignment: Alignment.center,
+          ),
+        ),
+      ],
+    );
+  }
+}
+
+class Indicator extends StatefulWidget {
+  Indicator({Key key, int count})
+      : count = count,
+        super(key: key);
+
+  final int count;
+
+  @override
+  createState() => new IndicatorState();
+}
+
+class IndicatorState extends State<Indicator> {
+  int _index = 0;
+
+  changeIndex(int index) {
+    setState(() {
+      _index = index;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    var indicators = <Widget>[];
+    for (var i = 0; i < widget.count; ++i) {
+      indicators.add(new Container(
+        width: 5.0,
+        height: 5.0,
+        decoration: new BoxDecoration(
+          borderRadius: new BorderRadius.all(new Radius.circular(5.0)),
+          color: _index == i ? Style.primaryColor : Style.borderColor,
+        ),
+      ));
+    }
+    return new SizedBox(
+      width: widget.count * 15.0,
+      height: 30.0,
+      child: new Row(
+        children: indicators,
+        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+      ),
+    );
+  }
+}