├── .gitignore
├── README.md
├── banner_gallery_library
    ├── .flutter-plugins
    ├── .gitignore
    ├── .idea
    │   ├── codeStyles
    │   │   └── Project.xml
    │   ├── inspectionProfiles
    │   │   └── Project_Default.xml
    │   ├── libraries
    │   │   ├── Dart_Packages.xml
    │   │   ├── Dart_SDK.xml
    │   │   └── Flutter_Plugins.xml
    │   ├── misc.xml
    │   ├── modules.xml
    │   └── workspace.xml
    ├── CHANGELOG.md
    ├── LICENSE
    ├── README.md
    ├── banner_gallery_library.iml
    ├── lib
    │   ├── banner_gallery_library.dart
    │   ├── bean
    │   │   └── banner_gallery_bean.dart
    │   └── page_view_indicator.dart
    ├── pubspec.yaml
    └── test
    │   └── banner_gallery_library_test.dart
└── photos
    └── Screenshot_v1.gif


/.gitignore:
--------------------------------------------------------------------------------
 1 | # See https://www.dartlang.org/guides/libraries/private-files
 2 | 
 3 | # Files and directories created by pub
 4 | .dart_tool/
 5 | .packages
 6 | .pub/
 7 | build/
 8 | # If you're building an application, you may want to check-in your pubspec.lock
 9 | pubspec.lock
10 | 
11 | # Directory created by dartdoc
12 | # If you don't generate documentation locally you can remove this line.
13 | doc/api/
14 | .DS_Store
15 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # BannerGalleryInFlutter
 2 | 用Flutter实现的无限滑动Banner。
 3 | 
 4 | ![Screenshot](https://github.com/h3clikejava/BannerGalleryInFlutter/blob/master/photos/Screenshot_v1.gif?raw=true)
 5 | 
 6 | 可配置的属性
 7 | 
 8 | |参数名|参数说明|
 9 | |-----|--------|
10 | |customViewPageItemWidget|自定义内容布局|
11 | |autoScrollDurationSeconds|自动滑动时间间隔[单位s]|
12 | |bannerScrollDirection|Banner滑动方向[水平/垂直]|
13 | |bannerMargin|Banner之间间距|
14 | |bannerBorderRadius|Banner圆角|
15 | |bannerDefaultBGColor|Banner默认背景颜色|
16 | |bannerTextAlignment|Banner文字位置|
17 | |bannerTextPadding|Banner文字Padding|
18 | |bannerTextColor|Banner文字颜色|
19 | |bannerTextBGColor|Banner文字背景颜色|
20 | |onPageTap|点击的事件监听|
21 | |height|View高度|
22 | |indicatorPositioned|指示器位置|
23 | |indicatorScrollDirection|指示器方向 [水平/垂直]|
24 | |indicatorNormalColor|指示器默认颜色|
25 | |indicatorSelectedColor|指示器选中颜色|
26 | |indicatorNormalSize|指示器点默认大小|
27 | |indicatorScaleSize|指示器点选中放大倍数，默认1.4倍|
28 | |indicatorSpacing|指示器点的间距|
29 | |indicatorStyle|指示器样式[circle: 圆形, square: 方形]|
30 | |indicatorAnimStyle|指示器动画样式[normal: 选中变色, scaled:选中放大]|
31 | 
32 | 
33 | 使用示例
34 | 
35 | ```
36 | /// 构建数据
37 | List<BannerGalleryBean> _createTestData() {
38 |     List<BannerGalleryBean> list = new List<BannerGalleryBean>();
39 |     for (int n = 0; n < IMGS.length; n++) {
40 |       list.add(BannerGalleryBean(
41 |           id: n.toString(),
42 |           photoUrl: https://www.baidu.com/img/bd_logo1.png?where=super,
43 |           description: n.toString);
44 |     }
45 |     return list;
46 |   }
47 |   
48 | /// 构建Widget
49 | BannerGalleryWidget(
50 |   data: _createTestData(),
51 |   indicatorSelectedColor: Theme.of(context).primaryColor,
52 | )
53 | ```
54 | 


--------------------------------------------------------------------------------
/banner_gallery_library/.flutter-plugins:
--------------------------------------------------------------------------------
1 | path_provider=/Users/H3c/.pub-cache/hosted/pub.flutter-io.cn/path_provider-0.4.1/
2 | shared_preferences=/Users/H3c/.pub-cache/hosted/pub.flutter-io.cn/shared_preferences-0.4.2/
3 | 


--------------------------------------------------------------------------------
/banner_gallery_library/.gitignore:
--------------------------------------------------------------------------------
 1 | .DS_Store
 2 | .dart_tool/
 3 | 
 4 | .packages
 5 | .pub/
 6 | 
 7 | build/
 8 | ios/.generated/
 9 | ios/Flutter/Generated.xcconfig
10 | ios/Runner/GeneratedPluginRegistrant.*
11 | 


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418 |         <entry key="yaml">
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461 |       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/pub_semver-1.4.1/lib" />
462 |       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/quiver-0.29.0+1/lib" />
463 |       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/shared_preferences-0.4.2/lib" />
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470 |       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/source_span-1.4.0/lib" />
471 |       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/stack_trace-1.9.2/lib" />
472 |       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/stream_channel-1.6.7+1/lib" />
473 |       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/string_scanner-1.0.2/lib" />
474 |       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/synchronized-1.5.1/lib" />
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480 |       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/vector_math-2.0.6/lib" />
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482 |       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/watcher-0.9.7+8/lib" />
483 |       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/web_socket_channel-1.0.8/lib" />
484 |       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/yaml-2.1.14/lib" />
485 |       <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/pkg/sky_engine/lib" />
486 |       <root url="file://$PROJECT_DIR$/../../flutter/packages/flutter/lib" />
487 |       <root url="file://$PROJECT_DIR$/../../flutter/packages/flutter_test/lib" />
488 |     </CLASSES>
489 |     <JAVADOC />
490 |     <SOURCES />
491 |   </library>
492 | </component>


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 1 | <component name="libraryTable">
 2 |   <library name="Dart SDK">
 3 |     <CLASSES>
 4 |       <root url="file:///Users/H3c/Documents/flutter/bin/cache/dart-sdk/lib/async" />
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 8 |       <root url="file:///Users/H3c/Documents/flutter/bin/cache/dart-sdk/lib/developer" />
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10 |       <root url="file:///Users/H3c/Documents/flutter/bin/cache/dart-sdk/lib/io" />
11 |       <root url="file:///Users/H3c/Documents/flutter/bin/cache/dart-sdk/lib/isolate" />
12 |       <root url="file:///Users/H3c/Documents/flutter/bin/cache/dart-sdk/lib/math" />
13 |       <root url="file:///Users/H3c/Documents/flutter/bin/cache/dart-sdk/lib/mirrors" />
14 |       <root url="file:///Users/H3c/Documents/flutter/bin/cache/dart-sdk/lib/typed_data" />
15 |     </CLASSES>
16 |     <JAVADOC />
17 |     <SOURCES />
18 |   </library>
19 | </component>


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/banner_gallery_library/.idea/libraries/Flutter_Plugins.xml:
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 1 | <component name="libraryTable">
 2 |   <library name="Flutter Plugins" type="FlutterPluginsLibraryType">
 3 |     <CLASSES>
 4 |       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/path_provider-0.4.1" />
 5 |       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/shared_preferences-0.4.2" />
 6 |     </CLASSES>
 7 |     <JAVADOC />
 8 |     <SOURCES />
 9 |   </library>
10 | </component>


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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <project version="4">
 3 |   <component name="NullableNotNullManager">
 4 |     <option name="myDefaultNullable" value="android.support.annotation.Nullable" />
 5 |     <option name="myDefaultNotNull" value="android.support.annotation.NonNull" />
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13 |           <item index="4" class="java.lang.String" itemvalue="android.support.annotation.Nullable" />
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17 |     <option name="myNotNulls">
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28 | </project>


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/banner_gallery_library/.idea/modules.xml:
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1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <project version="4">
3 |   <component name="ProjectModuleManager">
4 |     <modules>
5 |       <module fileurl="file://$PROJECT_DIR$/banner_gallery_library.iml" filepath="$PROJECT_DIR$/banner_gallery_library.iml" />
6 |     </modules>
7 |   </component>
8 | </project>
9 | 


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301 |     <entry file="file://$PROJECT_DIR$/lib/banner_gallery_library.dart">
302 |       <provider selected="true" editor-type-id="text-editor">
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305 |           <folding />
306 |         </state>
307 |       </provider>
308 |     </entry>
309 |     <entry file="file://$PROJECT_DIR$/banner_gallery_library.iml">
310 |       <provider selected="true" editor-type-id="text-editor">
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313 |         </state>
314 |       </provider>
315 |     </entry>
316 |     <entry file="file://$PROJECT_DIR$/example/example_server.dart" />
317 |     <entry file="file://$PROJECT_DIR$/lib/bean/banner_gallery_bean.dart">
318 |       <provider selected="true" editor-type-id="text-editor">
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321 |           <folding />
322 |         </state>
323 |       </provider>
324 |     </entry>
325 |     <entry file="file://$PROJECT_DIR$/lib/page_view_indicator.dart">
326 |       <provider selected="true" editor-type-id="text-editor">
327 |         <state relative-caret-position="0">
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329 |           <folding />
330 |         </state>
331 |       </provider>
332 |     </entry>
333 |     <entry file="file://$PROJECT_DIR$/pubspec.yaml">
334 |       <provider selected="true" editor-type-id="text-editor">
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339 |       </provider>
340 |     </entry>
341 |     <entry file="file://$PROJECT_DIR$/lib/banner_gallery_library.dart">
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345 |           <folding />
346 |         </state>
347 |       </provider>
348 |     </entry>
349 |   </component>
350 | </project>


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/banner_gallery_library/CHANGELOG.md:
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1 | ## [0.0.1] - TODO: Add release date.
2 | 
3 | * TODO: Describe initial release.
4 | 


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/banner_gallery_library/LICENSE:
--------------------------------------------------------------------------------
1 | TODO: Add your license here.
2 | 


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/banner_gallery_library/README.md:
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 1 | # banner_gallery_library
 2 | 
 3 |  It&#x27;s an infinity banner gallery widget in flutter.
 4 | 
 5 | ## Getting Started
 6 | 
 7 | For help getting started with Flutter, view our online [documentation](https://flutter.io/).
 8 | 
 9 | For help on editing package code, view the [documentation](https://flutter.io/developing-packages/).
10 | 


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/banner_gallery_library/banner_gallery_library.iml:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <module type="JAVA_MODULE" version="4">
 3 |   <component name="NewModuleRootManager" inherit-compiler-output="true">
 4 |     <exclude-output />
 5 |     <content url="file://$MODULE_DIR$">
 6 |       <sourceFolder url="file://$MODULE_DIR$/lib" isTestSource="false" />
 7 |       <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
 8 |       <excludeFolder url="file://$MODULE_DIR$/.dart_tool" />
 9 |       <excludeFolder url="file://$MODULE_DIR$/.idea" />
10 |       <excludeFolder url="file://$MODULE_DIR$/.pub" />
11 |       <excludeFolder url="file://$MODULE_DIR$/build" />
12 |     </content>
13 |     <orderEntry type="jdk" jdkName="Android API 25 Platform" jdkType="Android SDK" />
14 |     <orderEntry type="sourceFolder" forTests="false" />
15 |     <orderEntry type="library" name="Dart Packages" level="project" />
16 |     <orderEntry type="library" name="Dart SDK" level="project" />
17 |     <orderEntry type="library" name="Flutter Plugins" level="project" />
18 |   </component>
19 | </module>


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/banner_gallery_library/lib/banner_gallery_library.dart:
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  1 | library banner_gallery_library;
  2 | 
  3 | import 'dart:async';
  4 | 
  5 | import 'package:cached_network_image/cached_network_image.dart';
  6 | import 'package:flutter/material.dart';
  7 | import 'package:banner_gallery_library/page_view_indicator.dart';
  8 | import 'package:banner_gallery_library/bean/banner_gallery_bean.dart';
  9 | 
 10 | // 轮播的Banner Widget
 11 | class BannerGalleryWidget extends StatelessWidget {
 12 |   BannerGalleryWidget({
 13 |     this.data,
 14 |     this.customViewPageItemWidget,
 15 |     this.autoScrollDurationSeconds = 5,
 16 |     this.onPageTap,
 17 |     this.height = 150.0,
 18 |     this.bannerScrollDirection = Axis.horizontal,
 19 |     this.bannerMargin = const EdgeInsets.only(left: 10.0, right: 10.0),
 20 |     this.bannerBorderRadius = const BorderRadius.all(Radius.circular(10.0)),
 21 |     this.bannerDefaultBGColor = Colors.grey,
 22 |     this.bannerTextAlignment = Alignment.center,
 23 |     this.bannerTextPadding =
 24 |         const EdgeInsets.only(left: 15.0, right: 15.0, top: 5.0, bottom: 5.0),
 25 |     this.bannerTextColor = Colors.white,
 26 |     this.bannerTextBGColor = Colors.black54,
 27 |     this.indicatorPositioned = const Positioned(
 28 |       top: 10.0,
 29 |     ),
 30 |     this.indicatorScrollDirection = Axis.horizontal,
 31 |     this.indicatorNormalColor: Colors.white,
 32 |     this.indicatorSelectedColor: Colors.white,
 33 |     this.indicatorNormalSize: 8.0,
 34 |     this.indicatorScaleSize: 1.4,
 35 |     this.indicatorSpacing: 4.0,
 36 |     this.indicatorStyle: PageViewIndicatorStyle.circle,
 37 |     this.indicatorAnimStyle: PageViewIndicatorAnimStyle.scaled,
 38 |   });
 39 | 
 40 |   /// 内容数据
 41 |   final List<BannerGalleryBean> data;
 42 | 
 43 |   /// 自定义内容显示样式
 44 |   final List<Widget> customViewPageItemWidget;
 45 | 
 46 |   /// 自动滑动时间间隔[单位s]
 47 |   final int autoScrollDurationSeconds;
 48 | 
 49 |   /// Banner滑动方向[水平/垂直]
 50 |   final Axis bannerScrollDirection;
 51 | 
 52 |   /// Banner之间间距
 53 |   final EdgeInsetsGeometry bannerMargin;
 54 | 
 55 |   /// Banner圆角
 56 |   final BorderRadius bannerBorderRadius;
 57 | 
 58 |   /// Banner默认背景颜色
 59 |   final Color bannerDefaultBGColor;
 60 | 
 61 |   /// Banner文字位置
 62 |   final AlignmentGeometry bannerTextAlignment;
 63 | 
 64 |   /// Banner文字Padding
 65 |   final EdgeInsetsGeometry bannerTextPadding;
 66 | 
 67 |   /// Banner文字颜色
 68 |   final Color bannerTextColor;
 69 | 
 70 |   /// Banner文字背景颜色
 71 |   final Color bannerTextBGColor;
 72 | 
 73 |   /// 点击的事件监听
 74 |   final ValueChanged<int> onPageTap;
 75 | 
 76 |   /// View高度
 77 |   final double height;
 78 | 
 79 |   /// 指示器位置
 80 |   final Positioned indicatorPositioned;
 81 | 
 82 |   /// 指示器方向 [水平/垂直]
 83 |   final Axis indicatorScrollDirection;
 84 | 
 85 |   /// 指示器默认颜色
 86 |   final Color indicatorNormalColor;
 87 | 
 88 |   /// 指示器选中颜色
 89 |   final Color indicatorSelectedColor;
 90 | 
 91 |   /// 指示器点默认大小
 92 |   final double indicatorNormalSize;
 93 | 
 94 |   /// 指示器点选中放大倍数，默认1.4倍
 95 |   final double indicatorScaleSize;
 96 | 
 97 |   /// 指示器点的间距
 98 |   final double indicatorSpacing;
 99 | 
100 |   final PageViewIndicatorStyle indicatorStyle;
101 | 
102 |   /// 指示器动画样式[normal: 选中变色, scaled:选中放大]
103 |   final PageViewIndicatorAnimStyle indicatorAnimStyle;
104 | 
105 |   /// 轮播控制器
106 |   Timer _timer;
107 | 
108 |   /// 控制器
109 |   final PageController _controller = PageController(initialPage: 200);
110 | 
111 |   /// 获得真实数据的长度
112 |   int _getReallyDataSize() {
113 |     return data != null ? data.length : 0;
114 |   }
115 | 
116 |   /// 有触摸的时候，将轮播控制器状态清空
117 |   _resetTimer() {
118 |     if (_timer != null) {
119 |       _timer.cancel();
120 |     }
121 | 
122 |     _timer = new Timer.periodic(
123 |         new Duration(seconds: autoScrollDurationSeconds), (Timer timer) {
124 |       if (_controller.page != null) {
125 |         var nextPageIndex = _controller.page.toInt() + 1;
126 |         _toPage(nextPageIndex);
127 |       }
128 |     });
129 |   }
130 | 
131 |   /// 跳转到指定ViewPager
132 |   void _toPage(int page) {
133 |     _controller.animateToPage(page,
134 |         duration: Duration(milliseconds: 300), curve: Curves.ease);
135 |   }
136 | 
137 |   /// 生成默认的Item样式
138 |   Widget _generateViewPageDefaultItem(BuildContext context, int index) {
139 |     return Container(
140 |         margin: bannerMargin,
141 |         child: Material(
142 |           child: InkWell(
143 |             onTap: () => onPageTap(index),
144 |             onTapDown: _resetTimer(),
145 |             child: ClipRRect(
146 |               borderRadius: bannerBorderRadius,
147 |               child: customViewPageItemWidget != null
148 |                   ? customViewPageItemWidget[index]
149 |                   : _generateDefaultView(index),
150 |             ),
151 |           ),
152 |         ));
153 |   }
154 | 
155 |   Widget _generateDefaultView(int index) {
156 |     return Stack(
157 |       children: <Widget>[
158 |         Container(
159 |           height: double.infinity,
160 |           width: double.infinity,
161 |           alignment: Alignment.center,
162 |           color: bannerDefaultBGColor,
163 |           child: CachedNetworkImage(
164 |             height: double.infinity,
165 |             width: double.infinity,
166 |             alignment: Alignment.center,
167 |             fit: BoxFit.cover,
168 |             placeholder: CircularProgressIndicator(),
169 |             imageUrl: data[index].photoUrl,
170 |           ),
171 |         ),
172 |         _generateTextView(data[index].description),
173 |       ],
174 |     );
175 |   }
176 | 
177 |   /// 动态生成文字区域
178 |   Widget _generateTextView(String content) {
179 |     if (content == null || content.isEmpty) {
180 |       return Container();
181 |     }
182 | 
183 |     return Positioned(
184 |       left: 0.0,
185 |       right: 0.0,
186 |       bottom: 0.0,
187 |       child: Container(
188 |           color: bannerTextBGColor,
189 |           padding: bannerTextPadding,
190 |           alignment: bannerTextAlignment,
191 |           child: Text(
192 |             content,
193 |             overflow: TextOverflow.ellipsis,
194 |             maxLines: 2,
195 |             style: TextStyle(color: bannerTextColor),
196 |           )),
197 |     );
198 |   }
199 | 
200 |   @override
201 |   Widget build(BuildContext context) {
202 |     _resetTimer();
203 | 
204 |     return SizedBox(
205 |         height: height,
206 |         child: Container(
207 |             child: Stack(
208 |           alignment: Alignment.bottomCenter,
209 |           children: <Widget>[
210 |             PageView.builder(
211 |                 scrollDirection: bannerScrollDirection,
212 |                 controller: _controller,
213 |                 itemBuilder: (context, index) {
214 |                   return _generateViewPageDefaultItem(
215 |                       context, index % _getReallyDataSize());
216 |                 }),
217 |             Positioned(
218 |               left: indicatorPositioned.left,
219 |               top: indicatorPositioned.top,
220 |               right: indicatorPositioned.right,
221 |               bottom: indicatorPositioned.bottom,
222 |               child: PageViewIndicator(
223 |                 controller: _controller,
224 |                 itemCount: _getReallyDataSize(),
225 |                 size: indicatorNormalSize,
226 |                 scrollDirection: indicatorScrollDirection,
227 |                 normalColor: indicatorNormalColor,
228 |                 selectedColor: indicatorSelectedColor,
229 |                 spacing: indicatorSpacing,
230 |                 scaleSize: indicatorScaleSize,
231 |                 animStyle: indicatorAnimStyle,
232 |                 style: indicatorStyle,
233 |                 onPageSelected: (int page) {
234 |                   _toPage(page);
235 |                 },
236 |               ),
237 |             ),
238 |           ],
239 |         )));
240 |   }
241 | }
242 | 


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/banner_gallery_library/lib/bean/banner_gallery_bean.dart:
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 1 | class BannerGalleryBean {
 2 |   BannerGalleryBean({this.id, this.photoUrl, this.description});
 3 | 
 4 |   /// 唯一标识
 5 |   final String id;
 6 | 
 7 |   /// 图片网址
 8 |   final String photoUrl;
 9 | 
10 |   /// 描述
11 |   final String description;
12 | }
13 | 


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/banner_gallery_library/lib/page_view_indicator.dart:
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  1 | import 'dart:math';
  2 | 
  3 | import 'package:flutter/material.dart';
  4 | 
  5 | /// 滑动指示器的样式
  6 | enum PageViewIndicatorStyle {
  7 |   /// 圆形
  8 |   circle,
  9 | 
 10 |   /// 正方形
 11 |   square,
 12 | }
 13 | 
 14 | /// 滑动指示器的动画样式
 15 | enum PageViewIndicatorAnimStyle {
 16 |   /// 正常模式
 17 |   normal,
 18 | 
 19 |   /// 缩放模式，选中的变大
 20 |   scaled,
 21 | }
 22 | 
 23 | /// PageView滑动指示器
 24 | class PageViewIndicator extends AnimatedWidget {
 25 |   PageViewIndicator({
 26 |     this.controller,
 27 |     this.itemCount: 0,
 28 |     this.onPageSelected,
 29 |     this.scrollDirection = Axis.horizontal,
 30 |     this.normalColor: Colors.white,
 31 |     this.selectedColor: Colors.white,
 32 |     this.size: 8.0,
 33 |     this.spacing: 4.0,
 34 |     this.scaleSize: 1.4,
 35 |     this.style: PageViewIndicatorStyle.circle,
 36 |     this.animStyle: PageViewIndicatorAnimStyle.normal,
 37 |   })  : assert(controller != null),
 38 |         super(listenable: controller);
 39 | 
 40 |   /// PageView的控制器
 41 |   final PageController controller;
 42 | 
 43 |   /// 指示器的个数
 44 |   final int itemCount;
 45 | 
 46 |   /// 点击的事件监听
 47 |   final ValueChanged<int> onPageSelected;
 48 | 
 49 |   /// 方向
 50 |   final Axis scrollDirection;
 51 | 
 52 |   /// 普通的颜色
 53 |   final Color normalColor;
 54 | 
 55 |   /// 选中的颜色
 56 |   final Color selectedColor;
 57 | 
 58 |   /// 点的大小
 59 |   final double size;
 60 | 
 61 |   /// 点的间距
 62 |   final double spacing;
 63 | 
 64 |   /// 点的样式
 65 |   final PageViewIndicatorStyle style;
 66 | 
 67 |   /// 动画样式
 68 |   final PageViewIndicatorAnimStyle animStyle;
 69 | 
 70 |   /// 选中放大的倍数
 71 |   final double scaleSize;
 72 | 
 73 |   /// 点的Widget
 74 |   Widget _buildIndicator(int index, int pageCount, double dotSize,
 75 |       double spacing, double maxZoom) {
 76 |     // 当前未知
 77 |     double currentPosition =
 78 |         ((controller.page ?? controller.initialPage.toDouble()) %
 79 |             pageCount.toDouble());
 80 | 
 81 |     double selectedness = Curves.easeOut.transform(
 82 |       max(
 83 |         0.0,
 84 |         1.0 - (currentPosition - index).abs(),
 85 |       ),
 86 |     );
 87 | 
 88 |     // 是否是当前页面被选中
 89 |     bool isCurrentPageSelected = index ==
 90 |         (controller.page != null ? controller.page.round() % pageCount : 0);
 91 | 
 92 |     // 修复从0跳到最后一个时状态错误
 93 |     if (currentPosition > pageCount - 1 && index == 0) {
 94 |       selectedness = 1 - (pageCount.toDouble() - currentPosition);
 95 |     }
 96 | 
 97 |     // 计算缩放大小
 98 |     double zoom = 1.0 + (maxZoom - 1.0) * selectedness;
 99 | 
100 |     // 取中间色
101 |     final ColorTween selectedColorTween =
102 |         ColorTween(begin: normalColor, end: selectedColor);
103 | 
104 |     return Container(
105 |       width: size + (2 * spacing),
106 |       height: size + (2 * spacing),
107 |       child: Center(
108 |         child: Material(
109 |           shadowColor: Colors.black,
110 |           elevation: 2.0,
111 |           color: selectedColorTween.lerp(selectedness),
112 |           type: style == PageViewIndicatorStyle.circle
113 |               ? MaterialType.circle
114 |               : MaterialType.button,
115 |           child: Container(
116 |             width: dotSize * zoom,
117 |             height: dotSize * zoom,
118 |             child: InkWell(
119 |               onTap: () => onPageSelected(index),
120 |             ),
121 |           ),
122 |         ),
123 |       ),
124 |     );
125 |   }
126 | 
127 |   @override
128 |   Widget build(BuildContext context) {
129 |     if (scrollDirection == Axis.vertical) {
130 |       return Column(
131 |         mainAxisAlignment: MainAxisAlignment.center,
132 |         children: List<Widget>.generate(itemCount, (int index) {
133 |           return _buildIndicator(index, itemCount, size, spacing,
134 |               animStyle == PageViewIndicatorAnimStyle.scaled ? scaleSize : 1.0);
135 |         }),
136 |       );
137 |     } else {
138 |       return Row(
139 |         mainAxisAlignment: MainAxisAlignment.center,
140 |         children: List<Widget>.generate(itemCount, (int index) {
141 |           return _buildIndicator(index, itemCount, size, spacing,
142 |               animStyle == PageViewIndicatorAnimStyle.scaled ? scaleSize : 1.0);
143 |         }),
144 |       );
145 |     }
146 |   }
147 | }
148 | 


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/banner_gallery_library/pubspec.yaml:
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 1 | name: banner_gallery_library
 2 | description:  It&#x27;s an infinity banner gallery widget in flutter.
 3 | version: 0.0.1
 4 | author: H3c
 5 | homepage: https://github.com/h3clikejava/BannerGalleryInFlutter
 6 | 
 7 | dependencies:
 8 |   flutter:
 9 |     sdk: flutter
10 | 
11 |   cached_network_image: ^0.4.1
12 | 
13 | dev_dependencies:
14 |   flutter_test:
15 |     sdk: flutter
16 | 
17 | # For information on the generic Dart part of this file, see the
18 | # following page: https://www.dartlang.org/tools/pub/pubspec
19 | 
20 | # The following section is specific to Flutter.
21 | flutter:
22 | 
23 |   # To add assets to your package, add an assets section, like this:
24 |   # assets:
25 |   #  - images/a_dot_burr.jpeg
26 |   #  - images/a_dot_ham.jpeg
27 |   #
28 |   # For details regarding assets in packages, see
29 |   # https://flutter.io/assets-and-images/#from-packages
30 |   #
31 |   # An image asset can refer to one or more resolution-specific "variants", see
32 |   # https://flutter.io/assets-and-images/#resolution-aware.
33 | 
34 |   # To add custom fonts to your package, add a fonts section here,
35 |   # in this "flutter" section. Each entry in this list should have a
36 |   # "family" key with the font family name, and a "fonts" key with a
37 |   # list giving the asset and other descriptors for the font. For
38 |   # example:
39 |   # fonts:
40 |   #   - family: Schyler
41 |   #     fonts:
42 |   #       - asset: fonts/Schyler-Regular.ttf
43 |   #       - asset: fonts/Schyler-Italic.ttf
44 |   #         style: italic
45 |   #   - family: Trajan Pro
46 |   #     fonts:
47 |   #       - asset: fonts/TrajanPro.ttf
48 |   #       - asset: fonts/TrajanPro_Bold.ttf
49 |   #         weight: 700
50 |   #
51 |   # For details regarding fonts in packages, see
52 |   # https://flutter.io/custom-fonts/#from-packages
53 | 


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/banner_gallery_library/test/banner_gallery_library_test.dart:
--------------------------------------------------------------------------------
 1 | import 'package:test/test.dart';
 2 | 
 3 | import 'package:banner_gallery_library/banner_gallery_library.dart';
 4 | 
 5 | void main() {
 6 |   test('adds one to input values', () {
 7 |     final calculator = new Calculator();
 8 |     expect(calculator.addOne(2), 3);
 9 |     expect(calculator.addOne(-7), -6);
10 |     expect(calculator.addOne(0), 1);
11 |     expect(() => calculator.addOne(null), throwsNoSuchMethodError);
12 |   });
13 | }
14 | 


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/photos/Screenshot_v1.gif:
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https://raw.githubusercontent.com/h3clikejava/BannerGalleryInFlutter/1cd683f6180afaede97d67c21c12b90d216907d3/photos/Screenshot_v1.gif


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