重新封装waterfall_flow

.gitignore

+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+.dart_tool/
+.flutter-plugins
+.packages
+.pub-cache/
+.pub/
+build/
+
+# Android related
+**/android/**/gradle-wrapper.jar
+**/android/.gradle
+**/android/captures/
+**/android/gradlew
+**/android/gradlew.bat
+**/android/local.properties
+**/android/**/GeneratedPluginRegistrant.java
+
+# iOS/XCode related
+**/ios/**/*.mode1v3
+**/ios/**/*.mode2v3
+**/ios/**/*.moved-aside
+**/ios/**/*.pbxuser
+**/ios/**/*.perspectivev3
+**/ios/**/*sync/
+**/ios/**/.sconsign.dblite
+**/ios/**/.tags*
+**/ios/**/.vagrant/
+**/ios/**/DerivedData/
+**/ios/**/Icon?
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+**/ios/**/.symlinks/
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+**/ios/Flutter/Flutter.framework
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+**/ios/Flutter/Generated.xcconfig
+**/ios/Flutter/app.flx
+**/ios/Flutter/app.zip
+**/ios/Flutter/flutter_assets/
+**/ios/Flutter/flutter_export_environment.sh
+**/ios/ServiceDefinitions.json
+**/ios/Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!**/ios/**/default.mode1v3
+!**/ios/**/default.mode2v3
+!**/ios/**/default.pbxuser
+!**/ios/**/default.perspectivev3
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages
+
+.packages
+pubspec.lock
\ No newline at end of file

.metadata

+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: ee032f67c734e607d8ea5c870ba744daf4bf56e7
+  channel: master
+
+project_type: package

.vscode/launch.json

+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "debug",
+            "request": "launch",
+            "type": "dart",
+            "program": "example/lib/main.dart",
+        }
+    ]
+}
\ No newline at end of file

.vscode/settings.json

+{
+    "dart.flutterSdkPath": "/Users/roott/Documents/Tools/flutter/master",
+    "spellright.language": [
+        "en"
+    ],
+    "spellright.documentTypes": [
+        "markdown",
+        "latex",
+        "plaintext",
+        "dart"
+    ],
+    "spellright.parserByClass": {
+        "dart": {
+            "parser": "code"
+        }
+    }
+}
\ No newline at end of file

CHANGELOG.md

+## 2.0.5
+
+* getter 'minTrailingIndex' was called on null(#18)
+
+## 2.0.4
+
+* keep the trailingChildren around when run out of children before reaching the scroll offset(#14)
+
+## 2.0.3
+
+* fix closeToTrailing issue. extended_list#6
+
+## 2.0.2
+
+* fix wrong layout when child's size is changed.
+
+## 2.0.1
+
+* fix wrong layout when itemCount is changed.(#6)
+
+## 2.0.0
+
+* breaking change: fix typo(fullCrossAxisExtend => fullCrossAxisExtent)
+* breaking change: SliverWaterfallFlowDelegate is replace with SliverWaterfallFlowDelegateWithFixedCrossAxisCount and SliverWaterfallFlowDelegateWithMaxCrossAxisExtent.
+* support WaterfallFlow.count, WaterfallFlow.extend,SliverWaterfallFlow.count,SliverWaterfallFlow.extend.
+
+## 1.0.1
+
+* add miss dragStartBehavior.
+
+## 1.0.0
+
+* fix sdk error.
+* support ScrollViewKeyboardDismissBehavior(breaking change 1.17.0)
+
+## 0.1.5
+
+* fix sdk error.
+
+## 0.1.4
+
+* fix leading items are missing when pull to refresh.
+* fix analysis_options
+
+## 0.1.3
+
+* web support.
+
+## 0.1.2
+
+* update demo.
+
+## 0.1.1
+
+* update description.
+
+# 0.1.0
+
+* first release.

LICENSE

+MIT License
+
+Copyright (c) 2019 zmtzawqlp
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
\ No newline at end of file

README-ZH.md

+# waterfall_flow
+
+
+[![pub package](https://img.shields.io/pub/v/waterfall_flow.svg)](https://pub.dartlang.org/packages/waterfall_flow) [![GitHub stars](https://img.shields.io/github/stars/fluttercandies/waterfall_flow)](https://github.com/fluttercandies/waterfall_flow/stargazers) [![GitHub forks](https://img.shields.io/github/forks/fluttercandies/waterfall_flow)](https://github.com/fluttercandies/waterfall_flow/network)  [![GitHub license](https://img.shields.io/github/license/fluttercandies/waterfall_flow)](https://github.com/fluttercandies/waterfall_flow/blob/master/LICENSE)  [![GitHub issues](https://img.shields.io/github/issues/fluttercandies/waterfall_flow)](https://github.com/fluttercandies/waterfall_flow/issues) <a target="_blank" href="https://jq.qq.com/?_wv=1027&k=5bcc0gy"><img border="0" src="https://pub.idqqimg.com/wpa/images/group.png" alt="flutter-candies" title="flutter-candies"></a>
+
+能够快速构建瀑布流布局的列表.
+
+[Web demo for WaterfallFlow](https://fluttercandies.github.io/waterfall_flow/)
+
+Language: [English](README.md) | 中文简体
+
+- [waterfall_flow](#waterfall_flow)
+  - [使用](#使用)
+  - [简单使用](#简单使用)
+  - [列表元素回收](#列表元素回收)
+  - [ViewportBuilder](#viewportbuilder)
+  - [LastChildLayoutTypeBuilder](#lastchildlayouttypebuilder)
+  - [CloseToTrailing](#closetotrailing)
+
+## 使用
+
+* 在pubspec.yaml中增加库引用
+
+```yaml
+
+dependencies:
+  waterfall_flow: any
+
+```
+* 导入库
+
+```dart
+
+  import 'package:waterfall_flow/waterfall_flow.dart';
+
+```
+
+
+## 简单使用
+
+| ![img](https://github.com/fluttercandies/flutter_candies/tree/master/gif/waterfall_flow/random_sized.gif) | ![img](https://github.com/fluttercandies/flutter_candies/tree/master/gif/waterfall_flow/custom_scrollView.gif) |
+| --------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------- |
+| ![img](https://github.com/fluttercandies/flutter_candies/tree/master/gif/waterfall_flow/known_sized.gif)  | ![img](https://github.com/fluttercandies/flutter_candies/tree/master/gif/waterfall_flow/variable_sized.gif)    |
+
+你可以通过设置SliverWaterfallFlowDelegate参数来定义瀑布流
+
+* SliverWaterfallFlowDelegateWithFixedCrossAxisCount
+
+| 参数      | 描述          | 默认 |
+| -------------- | -------------------- | ------- |
+| crossAxisCount | 横轴的等长度元素数量 | 必填    |
+
+* SliverWaterfallFlowDelegateWithMaxCrossAxisExtent
+
+| 参数          | 描述                                    | 默认  |
+| ------------------ | ---------------------------------------------- | -------- |
+| maxCrossAxisExtent | 横轴元素最大的大小. | required |
+
+* SliverWaterfallFlowDelegate
+
+| 参数          | 描述                                    | 默认  |
+| ------------------ | ---------------------------------------------- | -------- |
+| mainAxisSpacing            | 主轴元素之间的距离                     | 0.0|
+| crossAxisSpacing           | 横轴元素之间的距离                     | 0.0|
+| collectGarbage             | 元素回收时候的回调                     | -  |
+| lastChildLayoutTypeBuilder | 最后一个元素的布局样式(详情请查看后面) | -   |
+| viewportBuilder            | 可视区域中元素indexes变化时的回调      | -   |
+| closeToTrailing            | 可否让布局紧贴trailing(详情请查看后面) | false|
+
+```dart
+            WaterfallFlow.builder(
+              //cacheExtent: 0.0,
+              padding: EdgeInsets.all(5.0),
+              gridDelegate: SliverWaterfallFlowDelegateWithFixedCrossAxisCount(
+                  crossAxisCount: 2,
+                  crossAxisSpacing: 5.0,
+                  mainAxisSpacing: 5.0,
+                  /// follow max child trailing layout offset and layout with full cross axis extend
+                  /// last child as loadmore item/no more item in [GridView] and [WaterfallFlow]
+                  /// with full cross axis extend
+                  //  LastChildLayoutType.fullCrossAxisExtend,
+
+                  /// as foot at trailing and layout with full cross axis extend
+                  /// show no more item at trailing when children are not full of viewport
+                  /// if children is full of viewport, it's the same as fullCrossAxisExtend
+                  //  LastChildLayoutType.foot,
+                  lastChildLayoutTypeBuilder: (index) => index == _list.length
+                      ? LastChildLayoutType.foot
+                      : LastChildLayoutType.none,
+                  ),
+
+```
+
+## 列表元素回收
+
+追踪列表元素回收，你可以在这个时刻回收一些内存，比如图片的内存缓存。
+
+[更多详情](https://github.com/fluttercandies/extended_image/blob/e1577bc4d0b57c725110a9d886703b98a72772b5/example/lib/pages/photo_view_demo.dart#L91)
+
+```dart
+        WaterfallFlow.builder(
+            gridDelegate: SliverWaterfallFlowDelegateWithFixedCrossAxisCount(
+                     collectGarbage: (List<int> garbages) {
+                  ///collectGarbage
+                  garbages.forEach((index) {
+                    final provider = ExtendedNetworkImageProvider(
+                      _list[index].imageUrl,
+                    );
+                    provider.evict();
+                  });
+                },
+              ),
+```
+
+## ViewportBuilder
+
+追踪进入Viewport的列表元素的index（即你看到的可视区域，并不包括缓存距离）
+
+```dart
+        WaterfallFlow.builder(
+            gridDelegate: SliverWaterfallFlowDelegateWithFixedCrossAxisCount(
+                viewportBuilder: (int firstIndex, int lastIndex) {
+                print("viewport : [$firstIndex,$lastIndex]");
+                }),
+```
+
+## LastChildLayoutTypeBuilder
+
+为最后一个元素创建特殊布局，这主要是用在将最后一个元素作为loadmore/no more的时候。
+
+```dart
+        enum LastChildLayoutType {
+        /// 普通的
+        none,
+
+        /// 将最后一个元素绘制在最大主轴Item之后，并且使用横轴大小最为layout size
+        /// 主要使用在[ExtendedGridView] and [WaterfallFlow]中，最后一个元素作为loadmore/no more元素的时候。
+        fullCrossAxisExtend,
+
+        /// 将最后一个child绘制在trailing of viewport，并且使用横轴大小最为layout size
+        /// 这种常用于最后一个元素作为loadmore/no more元素，并且列表元素没有充满整个viewport的时候
+        /// 如果列表元素充满viewport，那么效果跟fullCrossAxisExtend一样
+        foot,
+        }
+
+      WaterfallFlow.builder(
+        gridDelegate: SliverWaterfallFlowDelegateWithFixedCrossAxisCount(
+            lastChildLayoutTypeBuilder: (index) => index == length
+                ? LastChildLayoutType.foot
+                : LastChildLayoutType.none,
+            ),
+```
+
+## CloseToTrailing
+
+当reverse设置为true的时候，布局会变成如下。常用于聊天列表，新的会话会被插入0的位置，但是当会话没有充满viewport的时候，下面的布局不是我们想要的。
+
+```
+     trailing
+-----------------
+|               |
+|               |
+|     item2     |
+|     item1     |
+|     item0     |
+-----------------
+     leading
+```
+
+为了解决这个问题，你可以设置 closeToTrailing 为true, 布局将变成如下
+该属性同时支持[ExtendedGridView],[ExtendedList],[WaterfallFlow]。
+当然如果reverse如果不为ture，你设置这个属性依然会生效，没满viewport的时候布局会紧靠trailing
+
+```
+     trailing
+-----------------
+|     item2     |
+|     item1     |
+|     item0     |
+|               |
+|               |
+-----------------
+     leading
+```
+
+```dart
+      WaterfallFlow.builder(
+        reverse: true,
+        gridDelegate: SliverWaterfallFlowDelegateWithFixedCrossAxisCount(closeToTrailing: true),
+```
+
+## ☕️Buy me a coffee
+
+![img](http://zmtzawqlp.gitee.io/my_images/images/qrcode.png)

README.md

+# waterfall_flow
+
+[![pub package](https://img.shields.io/pub/v/waterfall_flow.svg)](https://pub.dartlang.org/packages/waterfall_flow) [![GitHub stars](https://img.shields.io/github/stars/fluttercandies/waterfall_flow)](https://github.com/fluttercandies/waterfall_flow/stargazers) [![GitHub forks](https://img.shields.io/github/forks/fluttercandies/waterfall_flow)](https://github.com/fluttercandies/waterfall_flow/network)  [![GitHub license](https://img.shields.io/github/license/fluttercandies/waterfall_flow)](https://github.com/fluttercandies/waterfall_flow/blob/master/LICENSE)  [![GitHub issues](https://img.shields.io/github/issues/fluttercandies/waterfall_flow)](https://github.com/fluttercandies/waterfall_flow/issues) <a target="_blank" href="https://jq.qq.com/?_wv=1027&k=5bcc0gy"><img border="0" src="https://pub.idqqimg.com/wpa/images/group.png" alt="flutter-candies" title="flutter-candies"></a>
+
+A Flutter grid view easy to build waterfall flow layout quickly.
+
+[Web demo for WaterfallFlow](https://fluttercandies.github.io/waterfall_flow/)
+
+Language: English | [中文简体](README-ZH.md)
+
+- [waterfall_flow](#waterfall_flow)
+  - [Use](#use)
+  - [Easy to use](#easy-to-use)
+  - [CollectGarbage](#collectgarbage)
+  - [ViewportBuilder](#viewportbuilder)
+  - [LastChildLayoutTypeBuilder](#lastchildlayouttypebuilder)
+  - [CloseToTrailing](#closetotrailing)
+
+## Use
+
+* add library to your pubspec.yaml
+
+```yaml
+
+dependencies:
+  waterfall_flow: any
+
+```
+* import library in dart file
+
+```dart
+
+  import 'package:waterfall_flow/waterfall_flow.dart';
+
+```
+
+
+## Easy to use
+
+| ![img](https://github.com/fluttercandies/flutter_candies/tree/master/gif/waterfall_flow/random_sized.gif) | ![img](https://github.com/fluttercandies/flutter_candies/tree/master/gif/waterfall_flow/custom_scrollView.gif) |
+| --------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------- |
+| ![img](https://github.com/fluttercandies/flutter_candies/tree/master/gif/waterfall_flow/known_sized.gif)  | ![img](https://github.com/fluttercandies/flutter_candies/tree/master/gif/waterfall_flow/variable_sized.gif)    |
+
+you can define waterfall flow layout within SliverWaterfallFlowDelegate.
+
+* SliverWaterfallFlowDelegateWithFixedCrossAxisCount
+
+| parameter      | description                               | default  |
+| -------------- | ----------------------------------------- | -------- |
+| crossAxisCount | The number of children in the cross axis. | required |
+
+* SliverWaterfallFlowDelegateWithMaxCrossAxisExtent
+
+| parameter          | description                                    | default  |
+| ------------------ | ---------------------------------------------- | -------- |
+| maxCrossAxisExtent | The maximum extent of tiles in the cross axis. | required |
+
+* SliverWaterfallFlowDelegate
+
+| parameter          | description                                    | default  |
+| ------------------ | ---------------------------------------------- | -------- |
+| mainAxisSpacing            | The number of logical pixels between each child along the main axis.                | 0.0      |
+| crossAxisSpacing           | The number of logical pixels between each child along the cross axis.               | 0.0      |
+| collectGarbage             | Call when collect garbage, return indexs to collect                                 | -        |
+| lastChildLayoutTypeBuilder | The builder to get layout type of last child ,Notice: it should only for last child | -        |
+| viewportBuilder            | The builder to get indexs in viewport                                               | -        |
+| closeToTrailing            | Whether make layout close to trailing                                               | false    |
+
+```dart
+            WaterfallFlow.builder(
+              //cacheExtent: 0.0,
+              padding: EdgeInsets.all(5.0),
+              gridDelegate: SliverWaterfallFlowDelegateWithFixedCrossAxisCount(
+                  crossAxisCount: 2,
+                  crossAxisSpacing: 5.0,
+                  mainAxisSpacing: 5.0,
+                  /// follow max child trailing layout offset and layout with full cross axis extend
+                  /// last child as loadmore item/no more item in [GridView] and [WaterfallFlow]
+                  /// with full cross axis extend
+                  //  LastChildLayoutType.fullCrossAxisExtend,
+
+                  /// as foot at trailing and layout with full cross axis extend
+                  /// show no more item at trailing when children are not full of viewport
+                  /// if children is full of viewport, it's the same as fullCrossAxisExtend
+                  //  LastChildLayoutType.foot,
+                  lastChildLayoutTypeBuilder: (index) => index == _list.length
+                      ? LastChildLayoutType.foot
+                      : LastChildLayoutType.none,
+                  ),
+
+```
+
+## CollectGarbage
+
+track the indexes are collect, you can collect garbage at that monment(for example Image cache)
+
+[more detail](https://github.com/fluttercandies/extended_image/blob/e1577bc4d0b57c725110a9d886703b98a72772b5/example/lib/pages/photo_view_demo.dart#L91)
+
+```dart
+        WaterfallFlow.builder(
+            gridDelegate: SliverWaterfallFlowDelegateWithFixedCrossAxisCount(
+                collectGarbage: (List<int> garbages) {
+                  ///collectGarbage
+                  garbages.forEach((index) {
+                    final provider = ExtendedNetworkImageProvider(
+                      _list[index].imageUrl,
+                    );
+                    provider.evict();
+                  });
+                },
+              ),
+```
+
+## ViewportBuilder
+
+track the indexes go into the viewport, it's not include cache extent.
+
+```dart
+        WaterfallFlow.builder(
+            gridDelegate: SliverWaterfallFlowDelegateWithFixedCrossAxisCount(
+                viewportBuilder: (int firstIndex, int lastIndex) {
+                print("viewport : [$firstIndex,$lastIndex]");
+                }),
+```
+
+## LastChildLayoutTypeBuilder
+
+build lastChild as special child in the case that it is loadmore/no more item.
+
+```dart
+        enum LastChildLayoutType {
+        /// as default child
+        none,
+
+        /// follow max child trailing layout offset and layout with full cross axis extend
+        /// last child as loadmore item/no more item in [ExtendedGridView] and [WaterfallFlow]
+        /// with full cross axis extend
+        fullCrossAxisExtend,
+
+        /// as foot at trailing and layout with full cross axis extend
+        /// show no more item at trailing when children are not full of viewport
+        /// if children is full of viewport, it's the same as fullCrossAxisExtend
+        foot,
+        }
+
+      WaterfallFlow.builder(
+        gridDelegate: SliverWaterfallFlowDelegateWithFixedCrossAxisCount(
+            lastChildLayoutTypeBuilder: (index) => index == length
+                ? LastChildLayoutType.foot
+                : LastChildLayoutType.none,
+            ),
+```
+
+## CloseToTrailing
+
+when reverse property of List is true, layout is as following.
+it likes chat list, and new session will insert to zero index.
+but it's not right when items are not full of viewport.
+
+```
+     trailing
+-----------------
+|               |
+|               |
+|     item2     |
+|     item1     |
+|     item0     |
+-----------------
+     leading
+```
+
+to solve it, you could set closeToTrailing to true, layout is as following.
+support [ExtendedGridView],[ExtendedList],[WaterfallFlow].
+and it also works when reverse is flase, layout will close to trailing.
+
+```
+     trailing
+-----------------
+|     item2     |
+|     item1     |
+|     item0     |
+|               |
+|               |
+-----------------
+     leading
+```
+
+```dart
+      WaterfallFlow.builder(
+        reverse: true,
+        gridDelegate: SliverWaterfallFlowDelegateWithFixedCrossAxisCount(closeToTrailing: true),
+```

analysis_options.yaml

+# Specify analysis options.
+#
+# Until there are meta linter rules, each desired lint must be explicitly enabled.
+# See: https://github.com/dart-lang/linter/issues/288
+#
+# For a list of lints, see: http://dart-lang.github.io/linter/lints/
+# See the configuration guide for more
+# https://github.com/dart-lang/sdk/tree/master/pkg/analyzer#configuring-the-analyzer
+#
+# There are other similar analysis options files in the flutter repos,
+# which should be kept in sync with this file:
+#
+#   - analysis_options.yaml (this file)
+#   - packages/flutter/lib/analysis_options_user.yaml
+#   - https://github.com/flutter/plugins/blob/master/analysis_options.yaml
+#   - https://github.com/flutter/engine/blob/master/analysis_options.yaml
+#
+# This file contains the analysis options used by Flutter tools, such as IntelliJ,
+# Android Studio, and the `flutter analyze` command.
+
+analyzer:
+  strong-mode:
+    implicit-casts: false
+    implicit-dynamic: false
+  errors:
+    # treat missing required parameters as a warning (not a hint)
+    missing_required_param: warning
+    # treat missing returns as a warning (not a hint)
+    missing_return: warning
+    # allow having TODOs in the code
+    todo: ignore
+    # Ignore analyzer hints for updating pubspecs when using Future or
+    # Stream and not importing dart:async
+    # Please see https://github.com/flutter/flutter/pull/24528 for details.
+    sdk_version_async_exported_from_core: ignore
+  # exclude:
+  #   - "bin/cache/**"
+  #   # the following two are relative to the stocks example and the flutter package respectively
+  #   # see https://github.com/dart-lang/sdk/issues/28463
+  #   - "lib/i18n/messages_*.dart"
+  #   - "lib/src/http/**"
+
+linter:
+  rules:
+    # these rules are documented on and in the same order as
+    # the Dart Lint rules page to make maintenance easier
+    # https://github.com/dart-lang/linter/blob/master/example/all.yaml
+    - always_declare_return_types
+    - always_put_control_body_on_new_line
+    # - always_put_required_named_parameters_first # we prefer having parameters in the same order as fields https://github.com/flutter/flutter/issues/10219
+    - always_require_non_null_named_parameters
+    - always_specify_types
+    - annotate_overrides
+    # - avoid_annotating_with_dynamic # conflicts with always_specify_types
+    # - avoid_as # required for implicit-casts: true
+    - avoid_bool_literals_in_conditional_expressions
+    # - avoid_catches_without_on_clauses # we do this commonly
+    # - avoid_catching_errors # we do this commonly
+    - avoid_classes_with_only_static_members
+    # - avoid_double_and_int_checks # only useful when targeting JS runtime
+    - avoid_empty_else
+    # - avoid_equals_and_hash_code_on_mutable_classes # not yet tested
+    - avoid_field_initializers_in_const_classes
+    - avoid_function_literals_in_foreach_calls
+    # - avoid_implementing_value_types # not yet tested
+    - avoid_init_to_null
+    # - avoid_js_rounded_ints # only useful when targeting JS runtime
+    - avoid_null_checks_in_equality_operators
+    # - avoid_positional_boolean_parameters # not yet tested
+    # - avoid_print # not yet tested
+    # - avoid_private_typedef_functions # we prefer having typedef (discussion in https://github.com/flutter/flutter/pull/16356)
+    # - avoid_redundant_argument_values # not yet tested
+    - avoid_relative_lib_imports
+    - avoid_renaming_method_parameters
+    - avoid_return_types_on_setters
+    # - avoid_returning_null # there are plenty of valid reasons to return null
+    # - avoid_returning_null_for_future # not yet tested
+    - avoid_returning_null_for_void
+    # - avoid_returning_this # there are plenty of valid reasons to return this
+    # - avoid_setters_without_getters # not yet tested
+    # - avoid_shadowing_type_parameters # not yet tested
+    - avoid_single_cascade_in_expression_statements
+    - avoid_slow_async_io
+    - avoid_types_as_parameter_names
+    # - avoid_types_on_closure_parameters # conflicts with always_specify_types
+    # - avoid_unnecessary_containers # not yet tested
+    - avoid_unused_constructor_parameters
+    - avoid_void_async
+    # - avoid_web_libraries_in_flutter # not yet tested
+    - await_only_futures
+    - camel_case_extensions
+    - camel_case_types
+    - cancel_subscriptions
+    # - cascade_invocations # not yet tested
+    # - close_sinks # not reliable enough
+    # - comment_references # blocked on https://github.com/flutter/flutter/issues/20765
+    # - constant_identifier_names # needs an opt-out https://github.com/dart-lang/linter/issues/204
+    - control_flow_in_finally
+    # - curly_braces_in_flow_control_structures # not yet tested
+    # - diagnostic_describe_all_properties # not yet tested
+    - directives_ordering
+    - empty_catches
+    - empty_constructor_bodies
+    - empty_statements
+    # - file_names # not yet tested
+    - flutter_style_todos
+    - hash_and_equals
+    - implementation_imports
+    # - invariant_booleans # too many false positives: https://github.com/dart-lang/linter/issues/811
+    - iterable_contains_unrelated_type
+    # - join_return_with_assignment # not yet tested
+    - library_names
+    - library_prefixes
+    # - lines_longer_than_80_chars # not yet tested
+    - list_remove_unrelated_type
+    # - literal_only_boolean_expressions # too many false positives: https://github.com/dart-lang/sdk/issues/34181
+    # - missing_whitespace_between_adjacent_strings # not yet tested
+    - no_adjacent_strings_in_list
+    - no_duplicate_case_values
+    # - no_logic_in_create_state # not yet tested
+    # - no_runtimeType_toString # not yet tested
+    - non_constant_identifier_names
+    # - null_closures  # not yet tested
+    # - omit_local_variable_types # opposite of always_specify_types
+    # - one_member_abstracts # too many false positives
+    # - only_throw_errors # https://github.com/flutter/flutter/issues/5792
+    - overridden_fields
+    - package_api_docs
+    - package_names
+    - package_prefixed_library_names
+    # - parameter_assignments # we do this commonly
+    - prefer_adjacent_string_concatenation
+    - prefer_asserts_in_initializer_lists
+    # - prefer_asserts_with_message # not yet tested
+    - prefer_collection_literals
+    - prefer_conditional_assignment
+    - prefer_const_constructors
+    - prefer_const_constructors_in_immutables
+    - prefer_const_declarations
+    - prefer_const_literals_to_create_immutables
+    # - prefer_constructors_over_static_methods # not yet tested
+    - prefer_contains
+    # - prefer_double_quotes # opposite of prefer_single_quotes
+    - prefer_equal_for_default_values
+    # - prefer_expression_function_bodies # conflicts with https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#consider-using--for-short-functions-and-methods
+    - prefer_final_fields
+    - prefer_final_in_for_each
+    - prefer_final_locals
+    - prefer_for_elements_to_map_fromIterable
+    - prefer_foreach
+    # - prefer_function_declarations_over_variables # not yet tested
+    - prefer_generic_function_type_aliases
+    - prefer_if_elements_to_conditional_expressions
+    - prefer_if_null_operators
+    - prefer_initializing_formals
+    - prefer_inlined_adds
+    # - prefer_int_literals # not yet tested
+    # - prefer_interpolation_to_compose_strings # not yet tested
+    - prefer_is_empty
+    - prefer_is_not_empty
+    - prefer_is_not_operator
+    - prefer_iterable_whereType
+    # - prefer_mixin # https://github.com/dart-lang/language/issues/32
+    # - prefer_null_aware_operators # disable until NNBD, see https://github.com/flutter/flutter/pull/32711#issuecomment-492930932
+    # - prefer_relative_imports # not yet tested
+    - prefer_single_quotes
+    - prefer_spread_collections
+    - prefer_typing_uninitialized_variables
+    - prefer_void_to_null
+    # - provide_deprecation_message # not yet tested
+    # - public_member_api_docs # enabled on a case-by-case basis; see e.g. packages/analysis_options.yaml
+    - recursive_getters
+    - slash_for_doc_comments
+    # - sort_child_properties_last # not yet tested
+    - sort_constructors_first
+    - sort_pub_dependencies
+    - sort_unnamed_constructors_first
+    - test_types_in_equals
+    - throw_in_finally
+    # - type_annotate_public_apis # subset of always_specify_types
+    - type_init_formals
+    # - unawaited_futures # too many false positives
+    # - unnecessary_await_in_return # not yet tested
+    - unnecessary_brace_in_string_interps
+    - unnecessary_const
+    # - unnecessary_final # conflicts with prefer_final_locals
+    - unnecessary_getters_setters
+    # - unnecessary_lambdas # has false positives: https://github.com/dart-lang/linter/issues/498
+    - unnecessary_new
+    - unnecessary_null_aware_assignments
+    - unnecessary_null_in_if_null_operators
+    - unnecessary_overrides
+    - unnecessary_parenthesis
+    - unnecessary_statements
+    - unnecessary_string_interpolations
+    - unnecessary_this
+    - unrelated_type_equality_checks
+    # - unsafe_html # not yet tested
+    - use_full_hex_values_for_flutter_colors
+    # - use_function_type_syntax_for_parameters # not yet tested
+    # - use_key_in_widget_constructors # not yet tested
+    - use_rethrow_when_possible
+    # - use_setters_to_change_properties # not yet tested
+    # - use_string_buffers # has false positives: https://github.com/dart-lang/sdk/issues/34182
+    # - use_to_and_as_if_applicable # has false positives, so we prefer to catch this by code-review
+    - valid_regexps
+    - void_checks

example/.flutter-plugins-dependencies

+{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"path_provider","path":"/Users/qiaomeng/flutter/.pub-cache/hosted/pub.flutter-io.cn/path_provider-1.6.28/","dependencies":[]},{"name":"url_launcher","path":"/Users/qiaomeng/flutter/.pub-cache/hosted/pub.flutter-io.cn/url_launcher-5.3.0/","dependencies":[]}],"android":[{"name":"path_provider","path":"/Users/qiaomeng/flutter/.pub-cache/hosted/pub.flutter-io.cn/path_provider-1.6.28/","dependencies":[]},{"name":"url_launcher","path":"/Users/qiaomeng/flutter/.pub-cache/hosted/pub.flutter-io.cn/url_launcher-5.3.0/","dependencies":[]}],"macos":[{"name":"path_provider_macos","path":"/Users/qiaomeng/flutter/.pub-cache/hosted/pub.flutter-io.cn/path_provider_macos-0.0.4+8/","dependencies":[]}],"linux":[{"name":"path_provider_linux","path":"/Users/qiaomeng/flutter/.pub-cache/hosted/pub.flutter-io.cn/path_provider_linux-0.0.1+2/","dependencies":[]}],"windows":[{"name":"path_provider_windows","path":"/Users/qiaomeng/flutter/.pub-cache/hosted/pub.flutter-io.cn/path_provider_windows-0.0.4+3/","dependencies":[]}],"web":[{"name":"url_launcher_web","path":"/Users/qiaomeng/flutter/.pub-cache/hosted/pub.flutter-io.cn/url_launcher_web-0.1.5+3/","dependencies":[]}]},"dependencyGraph":[{"name":"path_provider","dependencies":["path_provider_macos","path_provider_linux","path_provider_windows"]},{"name":"path_provider_linux","dependencies":[]},{"name":"path_provider_macos","dependencies":[]},{"name":"path_provider_windows","dependencies":[]},{"name":"url_launcher","dependencies":["url_launcher_web"]},{"name":"url_launcher_web","dependencies":[]}],"date_created":"2021-09-28 16:57:14.801573","version":"1.22.4"}
\ No newline at end of file

example/.gitignore

+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+.dart_tool/
+.flutter-plugins
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Web related
+lib/generated_plugin_registrant.dart
+
+# Exceptions to above rules.
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages
+
+
+.packages
+pubspec.lock
\ No newline at end of file

example/.metadata

+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: ee032f67c734e607d8ea5c870ba744daf4bf56e7
+  channel: master
+
+project_type: app

example/README.md

+# example
+
+A new Flutter project.
+
+## Getting Started
+
+This project is a starting point for a Flutter application.
+
+A few resources to get you started if this is your first Flutter project:
+
+- [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab)
+- [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook)
+
+For help getting started with Flutter, view our
+[online documentation](https://flutter.dev/docs), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.

example/analysis_options.yaml

+# Specify analysis options.
+#
+# Until there are meta linter rules, each desired lint must be explicitly enabled.
+# See: https://github.com/dart-lang/linter/issues/288
+#
+# For a list of lints, see: http://dart-lang.github.io/linter/lints/
+# See the configuration guide for more
+# https://github.com/dart-lang/sdk/tree/master/pkg/analyzer#configuring-the-analyzer
+#
+# There are other similar analysis options files in the flutter repos,
+# which should be kept in sync with this file:
+#
+#   - analysis_options.yaml (this file)
+#   - packages/flutter/lib/analysis_options_user.yaml
+#   - https://github.com/flutter/plugins/blob/master/analysis_options.yaml
+#   - https://github.com/flutter/engine/blob/master/analysis_options.yaml
+#
+# This file contains the analysis options used by Flutter tools, such as IntelliJ,
+# Android Studio, and the `flutter analyze` command.
+
+analyzer:
+  strong-mode:
+    implicit-casts: false
+    implicit-dynamic: false
+  errors:
+    # treat missing required parameters as a warning (not a hint)
+    missing_required_param: warning
+    # treat missing returns as a warning (not a hint)
+    missing_return: warning
+    # allow having TODOs in the code
+    todo: ignore
+    # Ignore analyzer hints for updating pubspecs when using Future or
+    # Stream and not importing dart:async
+    # Please see https://github.com/flutter/flutter/pull/24528 for details.
+    sdk_version_async_exported_from_core: ignore
+  exclude:
+    - "lib/common/data/mock_data.dart"
+  #   # the following two are relative to the stocks example and the flutter package respectively
+  #   # see https://github.com/dart-lang/sdk/issues/28463
+  #   - "lib/i18n/messages_*.dart"
+  #   - "lib/src/http/**"
+
+linter:
+  rules:
+    # these rules are documented on and in the same order as
+    # the Dart Lint rules page to make maintenance easier
+    # https://github.com/dart-lang/linter/blob/master/example/all.yaml
+    - always_declare_return_types
+    - always_put_control_body_on_new_line
+    # - always_put_required_named_parameters_first # we prefer having parameters in the same order as fields https://github.com/flutter/flutter/issues/10219
+    - always_require_non_null_named_parameters
+    - always_specify_types
+    - annotate_overrides
+    # - avoid_annotating_with_dynamic # conflicts with always_specify_types
+    # - avoid_as # required for implicit-casts: true
+    - avoid_bool_literals_in_conditional_expressions
+    # - avoid_catches_without_on_clauses # we do this commonly
+    # - avoid_catching_errors # we do this commonly
+    - avoid_classes_with_only_static_members
+    # - avoid_double_and_int_checks # only useful when targeting JS runtime
+    - avoid_empty_else
+    # - avoid_equals_and_hash_code_on_mutable_classes # not yet tested
+    - avoid_field_initializers_in_const_classes
+    - avoid_function_literals_in_foreach_calls
+    # - avoid_implementing_value_types # not yet tested
+    - avoid_init_to_null
+    # - avoid_js_rounded_ints # only useful when targeting JS runtime
+    - avoid_null_checks_in_equality_operators
+    # - avoid_positional_boolean_parameters # not yet tested
+    # - avoid_print # not yet tested
+    # - avoid_private_typedef_functions # we prefer having typedef (discussion in https://github.com/flutter/flutter/pull/16356)
+    # - avoid_redundant_argument_values # not yet tested
+    - avoid_relative_lib_imports
+    - avoid_renaming_method_parameters
+    - avoid_return_types_on_setters
+    # - avoid_returning_null # there are plenty of valid reasons to return null
+    # - avoid_returning_null_for_future # not yet tested
+    - avoid_returning_null_for_void
+    # - avoid_returning_this # there are plenty of valid reasons to return this
+    # - avoid_setters_without_getters # not yet tested
+    # - avoid_shadowing_type_parameters # not yet tested
+    - avoid_single_cascade_in_expression_statements
+    - avoid_slow_async_io
+    - avoid_types_as_parameter_names
+    # - avoid_types_on_closure_parameters # conflicts with always_specify_types
+    # - avoid_unnecessary_containers # not yet tested
+    - avoid_unused_constructor_parameters
+    - avoid_void_async
+    # - avoid_web_libraries_in_flutter # not yet tested
+    - await_only_futures
+    - camel_case_extensions
+    - camel_case_types
+    - cancel_subscriptions
+    # - cascade_invocations # not yet tested
+    # - close_sinks # not reliable enough
+    # - comment_references # blocked on https://github.com/flutter/flutter/issues/20765
+    # - constant_identifier_names # needs an opt-out https://github.com/dart-lang/linter/issues/204
+    - control_flow_in_finally
+    # - curly_braces_in_flow_control_structures # not yet tested
+    # - diagnostic_describe_all_properties # not yet tested
+    - directives_ordering
+    - empty_catches
+    - empty_constructor_bodies
+    - empty_statements
+    # - file_names # not yet tested
+    - flutter_style_todos
+    - hash_and_equals
+    - implementation_imports
+    # - invariant_booleans # too many false positives: https://github.com/dart-lang/linter/issues/811
+    - iterable_contains_unrelated_type
+    # - join_return_with_assignment # not yet tested
+    - library_names
+    - library_prefixes
+    # - lines_longer_than_80_chars # not yet tested
+    - list_remove_unrelated_type
+    # - literal_only_boolean_expressions # too many false positives: https://github.com/dart-lang/sdk/issues/34181
+    # - missing_whitespace_between_adjacent_strings # not yet tested
+    - no_adjacent_strings_in_list
+    - no_duplicate_case_values
+    # - no_logic_in_create_state # not yet tested
+    # - no_runtimeType_toString # not yet tested
+    - non_constant_identifier_names
+    # - null_closures  # not yet tested
+    # - omit_local_variable_types # opposite of always_specify_types
+    # - one_member_abstracts # too many false positives
+    # - only_throw_errors # https://github.com/flutter/flutter/issues/5792
+    - overridden_fields
+    - package_api_docs
+    - package_names
+    - package_prefixed_library_names
+    # - parameter_assignments # we do this commonly
+    - prefer_adjacent_string_concatenation
+    - prefer_asserts_in_initializer_lists
+    # - prefer_asserts_with_message # not yet tested
+    - prefer_collection_literals
+    - prefer_conditional_assignment
+    - prefer_const_constructors
+    - prefer_const_constructors_in_immutables
+    - prefer_const_declarations
+    - prefer_const_literals_to_create_immutables
+    # - prefer_constructors_over_static_methods # not yet tested
+    - prefer_contains
+    # - prefer_double_quotes # opposite of prefer_single_quotes
+    - prefer_equal_for_default_values
+    # - prefer_expression_function_bodies # conflicts with https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#consider-using--for-short-functions-and-methods
+    - prefer_final_fields
+    - prefer_final_in_for_each
+    - prefer_final_locals
+    - prefer_for_elements_to_map_fromIterable
+    - prefer_foreach
+    # - prefer_function_declarations_over_variables # not yet tested
+    - prefer_generic_function_type_aliases
+    - prefer_if_elements_to_conditional_expressions
+    - prefer_if_null_operators
+    - prefer_initializing_formals
+    - prefer_inlined_adds
+    # - prefer_int_literals # not yet tested
+    # - prefer_interpolation_to_compose_strings # not yet tested
+    - prefer_is_empty
+    - prefer_is_not_empty
+    - prefer_is_not_operator
+    - prefer_iterable_whereType
+    # - prefer_mixin # https://github.com/dart-lang/language/issues/32
+    # - prefer_null_aware_operators # disable until NNBD, see https://github.com/flutter/flutter/pull/32711#issuecomment-492930932
+    # - prefer_relative_imports # not yet tested
+    - prefer_single_quotes
+    - prefer_spread_collections
+    - prefer_typing_uninitialized_variables
+    - prefer_void_to_null
+    # - provide_deprecation_message # not yet tested
+    # - public_member_api_docs # enabled on a case-by-case basis; see e.g. packages/analysis_options.yaml
+    - recursive_getters
+    - slash_for_doc_comments
+    # - sort_child_properties_last # not yet tested
+    - sort_constructors_first
+    - sort_pub_dependencies
+    - sort_unnamed_constructors_first
+    - test_types_in_equals
+    - throw_in_finally
+    # - type_annotate_public_apis # subset of always_specify_types
+    - type_init_formals
+    # - unawaited_futures # too many false positives
+    # - unnecessary_await_in_return # not yet tested
+    - unnecessary_brace_in_string_interps
+    - unnecessary_const
+    # - unnecessary_final # conflicts with prefer_final_locals
+    - unnecessary_getters_setters
+    # - unnecessary_lambdas # has false positives: https://github.com/dart-lang/linter/issues/498
+    - unnecessary_new
+    - unnecessary_null_aware_assignments
+    - unnecessary_null_in_if_null_operators
+    - unnecessary_overrides
+    - unnecessary_parenthesis
+    - unnecessary_statements
+    - unnecessary_string_interpolations
+    - unnecessary_this
+    - unrelated_type_equality_checks
+    # - unsafe_html # not yet tested
+    - use_full_hex_values_for_flutter_colors
+    # - use_function_type_syntax_for_parameters # not yet tested
+    # - use_key_in_widget_constructors # not yet tested
+    - use_rethrow_when_possible
+    # - use_setters_to_change_properties # not yet tested
+    # - use_string_buffers # has false positives: https://github.com/dart-lang/sdk/issues/34182
+    # - use_to_and_as_if_applicable # has false positives, so we prefer to catch this by code-review
+    - valid_regexps
+    - void_checks

example/android/.gitignore

+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
+key.properties

example/android/app/build.gradle

+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    compileSdkVersion 29
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    lintOptions {
+        disable 'InvalidPackage'
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "com.example.example"
+        minSdkVersion 16
+        targetSdkVersion 29
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+}

example/android/app/src/debug/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.example">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

example/android/app/src/main/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.example">
+    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
+         calls FlutterMain.startInitialization(this); in its onCreate method.
+         In most cases you can leave this as-is, but you if you want to provide
+         additional functionality it is fine to subclass or reimplement
+         FlutterApplication and put your custom class here. -->
+    <application
+        android:name="io.flutter.app.FlutterApplication"
+        android:label="example"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <!-- Displays an Android View that continues showing the launch screen
+                 Drawable until Flutter paints its first frame, then this splash
+                 screen fades out. A splash screen is useful to avoid any visual
+                 gap between the end of Android's launch screen and the painting of
+                 Flutter's first frame. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.SplashScreenDrawable"
+              android:resource="@drawable/launch_background"
+              />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+</manifest>

example/android/app/src/main/kotlin/com/example/example/MainActivity.kt

+package com.example.example
+
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity: FlutterActivity() {
+}

example/android/app/src/main/res/drawable/launch_background.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

example/android/app/src/main/res/values/styles.xml

+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             Flutter draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+         
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">@android:color/white</item>
+    </style>
+</resources>

example/android/app/src/profile/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.example">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

example/android/build.gradle

+buildscript {
+    ext.kotlin_version = '1.3.50'
+    repositories {
+        google()
+        jcenter()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+    project.evaluationDependsOn(':app')
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

example/android/gradle.properties

+org.gradle.jvmargs=-Xmx1536M
+android.useAndroidX=true
+android.enableJetifier=true
+android.enableR8=true

example/android/gradle/wrapper/gradle-wrapper.properties

+#Fri Jun 23 08:50:38 CEST 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-all.zip

example/android/settings.gradle

+include ':app'
+
+def localPropertiesFile = new File(rootProject.projectDir, "local.properties")
+def properties = new Properties()
+
+assert localPropertiesFile.exists()
+localPropertiesFile.withReader("UTF-8") { reader -> properties.load(reader) }
+
+def flutterSdkPath = properties.getProperty("flutter.sdk")
+assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle"

example/assets_generator_arguments

+- t f -o lib/common -s
\ No newline at end of file

example/ff_annotation_route_commands

+--route-constants --route-names --route-helper --git flutter_candies_demo_library --no-is-initial-route
\ No newline at end of file

example/ios/.gitignore

+*.mode1v3
+*.mode2v3
+*.moved-aside
+*.pbxuser
+*.perspectivev3
+**/*sync/
+.sconsign.dblite
+.tags*
+**/.vagrant/
+**/DerivedData/
+Icon?
+**/Pods/
+**/.symlinks/
+profile
+xcuserdata
+**/.generated/
+Flutter/App.framework
+Flutter/Flutter.framework
+Flutter/Flutter.podspec
+Flutter/Generated.xcconfig
+Flutter/app.flx
+Flutter/app.zip
+Flutter/flutter_assets/
+Flutter/flutter_export_environment.sh
+ServiceDefinitions.json
+Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!default.mode1v3
+!default.mode2v3
+!default.pbxuser
+!default.perspectivev3

example/ios/Flutter/AppFrameworkInfo.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>$(DEVELOPMENT_LANGUAGE)</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+  <key>MinimumOSVersion</key>
+  <string>9.0</string>
+</dict>
+</plist>

example/ios/Flutter/Debug.xcconfig

+#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
+#include "Generated.xcconfig"

example/ios/Flutter/Release.xcconfig

+#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
+#include "Generated.xcconfig"

example/ios/Podfile

+# Uncomment this line to define a global platform for your project
+# platform :ios, '9.0'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+  'Debug' => :debug,
+  'Profile' => :release,
+  'Release' => :release,
+}
+
+def flutter_root
+  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
+  unless File.exist?(generated_xcode_build_settings_path)
+    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
+  end
+
+  File.foreach(generated_xcode_build_settings_path) do |line|
+    matches = line.match(/FLUTTER_ROOT\=(.*)/)
+    return matches[1].strip if matches
+  end
+  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
+end
+
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_ios_podfile_setup
+
+target 'Runner' do
+  use_frameworks!
+  use_modular_headers!
+
+  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
+end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    flutter_additional_ios_build_settings(target)
+  end
+end

example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+</Workspace>

example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1020"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+               BuildableName = "Runner.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Profile"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

example/ios/Runner.xcworkspace/contents.xcworkspacedata

+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+</Workspace>

example/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

example/ios/Runner/AppDelegate.swift

+import UIKit
+import Flutter
+
+@UIApplicationMain
+@objc class AppDelegate: FlutterAppDelegate {
+  override func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+  ) -> Bool {
+    GeneratedPluginRegistrant.register(with: self)
+    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+  }
+}

example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

+{
+  "images" : [
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "83.5x83.5",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-83.5x83.5@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Icon-App-1024x1024@1x.png",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

example/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

example/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md

+# Launch Screen Assets
+
+You can customize the launch screen with your own desired assets by replacing the image files in this directory.
+
+You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images.
\ No newline at end of file

example/ios/Runner/Base.lproj/LaunchScreen.storyboard

+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G29" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Ydg-fD-yQy"/>
+                        <viewControllerLayoutGuide type="bottom" id="xbc-2k-c8Z"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="1a2-6s-vTC"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="4X2-HB-R7a"/>
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="LaunchImage" width="168" height="185"/>
+    </resources>
+</document>

example/ios/Runner/Base.lproj/Main.storyboard

+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--Flutter View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="FlutterViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

example/ios/Runner/Info.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>example</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(FLUTTER_BUILD_NAME)</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UIViewControllerBasedStatusBarAppearance</key>
+	<false/>
+</dict>
+</plist>

example/ios/Runner/Runner-Bridging-Header.h

+#import "GeneratedPluginRegistrant.h"

example/lib/example_route.dart

+// GENERATED CODE - DO NOT MODIFY MANUALLY
+// **************************************************************************
+// Auto generated by https://github.com/fluttercandies/ff_annotation_route
+// **************************************************************************
+
+import 'package:ff_annotation_route/ff_annotation_route.dart';
+import 'package:flutter/widgets.dart';
+import 'pages/main_page.dart';
+import 'pages/simple/custom_scrollView_demo.dart';
+import 'pages/simple/random_sized_demo.dart';
+
+RouteResult getRouteResult({String name, Map<String, dynamic> arguments}) {
+  arguments = arguments ?? const <String, dynamic>{};
+  switch (name) {
+    case 'fluttercandies://custom_scrollview':
+      return RouteResult(
+        name: name,
+        widget: CustomScrollviewDemo(),
+        routeName: 'custom_scrollview',
+        description: 'show how to build waterfall flow in CustomScrollview.',
+        exts: <String, dynamic>{'group': 'Simple', 'order': 1},
+      );
+    case 'fluttercandies://demogrouppage':
+      return RouteResult(
+        name: name,
+        widget: DemoGroupPage(
+          keyValue:
+              arguments['keyValue'] as MapEntry<String, List<DemoRouteResult>>,
+        ),
+        routeName: 'DemoGroupPage',
+      );
+    case 'fluttercandies://known-sized':
+      return RouteResult(
+        name: name,
+        routeName: 'known-sized',
+        description:
+            'show how to build a known-sized item with waterfall flow list.',
+        exts: <String, dynamic>{'group': 'Complex', 'order': 1},
+      );
+    case 'fluttercandies://mainpage':
+      return RouteResult(
+        name: name,
+        widget: MainPage(),
+        routeName: 'MainPage',
+      );
+    case 'fluttercandies://random-sized':
+      return RouteResult(
+        name: name,
+        widget: RandomSizedDemo(),
+        routeName: 'random-sized',
+        description:
+            'show how to build random-sized item with waterfall flow list.',
+        exts: <String, dynamic>{'group': 'Simple', 'order': 0},
+      );
+    case 'fluttercandies://variable-sized':
+      return RouteResult(
+        name: name,
+        routeName: 'variable-sized',
+        description:
+            'show how to build a variable-sized item with waterfall flow list.',
+        exts: <String, dynamic>{'group': 'Complex', 'order': 1},
+      );
+    default:
+      return const RouteResult(name: 'flutterCandies://notfound');
+  }
+}
+
+class RouteResult {
+  const RouteResult({
+    @required this.name,
+    this.widget,
+    this.showStatusBar = true,
+    this.routeName = '',
+    this.pageRouteType,
+    this.description = '',
+    this.exts,
+  });
+
+  /// The name of the route (e.g., "/settings").
+  ///
+  /// If null, the route is anonymous.
+  final String name;
+
+  /// The Widget return base on route
+  final Widget widget;
+
+  /// Whether show this route with status bar.
+  final bool showStatusBar;
+
+  /// The route name to track page
+  final String routeName;
+
+  /// The type of page route
+  final PageRouteType pageRouteType;
+
+  /// The description of route
+  final String description;
+
+  /// The extend arguments
+  final Map<String, dynamic> exts;
+}

example/lib/example_route_helper.dart

+// GENERATED CODE - DO NOT MODIFY MANUALLY
+// **************************************************************************
+// Auto generated by https://github.com/fluttercandies/ff_annotation_route
+// **************************************************************************
+
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+import 'package:ff_annotation_route/ff_annotation_route.dart';
+
+import 'example_route.dart';
+
+class FFNavigatorObserver extends NavigatorObserver {
+  FFNavigatorObserver({this.routeChange});
+
+  final RouteChange routeChange;
+
+  @override
+  void didPop(Route<dynamic> route, Route<dynamic> previousRoute) {
+    super.didPop(route, previousRoute);
+    _didRouteChange(previousRoute, route);
+  }
+
+  @override
+  void didPush(Route<dynamic> route, Route<dynamic> previousRoute) {
+    super.didPush(route, previousRoute);
+    _didRouteChange(route, previousRoute);
+  }
+
+  @override
+  void didRemove(Route<dynamic> route, Route<dynamic> previousRoute) {
+    super.didRemove(route, previousRoute);
+    _didRouteChange(previousRoute, route);
+  }
+
+  @override
+  void didReplace({Route<dynamic> newRoute, Route<dynamic> oldRoute}) {
+    super.didReplace(newRoute: newRoute, oldRoute: oldRoute);
+    _didRouteChange(newRoute, oldRoute);
+  }
+
+  void _didRouteChange(Route<dynamic> newRoute, Route<dynamic> oldRoute) {
+    // oldRoute may be null when route first time enter.
+    routeChange?.call(newRoute, oldRoute);
+  }
+}
+
+typedef RouteChange = void Function(
+    Route<dynamic> newRoute, Route<dynamic> oldRoute);
+
+class FFTransparentPageRoute<T> extends PageRouteBuilder<T> {
+  FFTransparentPageRoute({
+    RouteSettings settings,
+    @required RoutePageBuilder pageBuilder,
+    RouteTransitionsBuilder transitionsBuilder = _defaultTransitionsBuilder,
+    Duration transitionDuration = const Duration(milliseconds: 150),
+    bool barrierDismissible = false,
+    Color barrierColor,
+    String barrierLabel,
+    bool maintainState = true,
+  })  : assert(pageBuilder != null),
+        assert(transitionsBuilder != null),
+        assert(barrierDismissible != null),
+        assert(maintainState != null),
+        super(
+          settings: settings,
+          opaque: false,
+          pageBuilder: pageBuilder,
+          transitionsBuilder: transitionsBuilder,
+          transitionDuration: transitionDuration,
+          barrierDismissible: barrierDismissible,
+          barrierColor: barrierColor,
+          barrierLabel: barrierLabel,
+          maintainState: maintainState,
+        );
+}
+
+Widget _defaultTransitionsBuilder(
+  BuildContext context,
+  Animation<double> animation,
+  Animation<double> secondaryAnimation,
+  Widget child,
+) {
+  return FadeTransition(
+    opacity: CurvedAnimation(
+      parent: animation,
+      curve: Curves.easeOut,
+    ),
+    child: child,
+  );
+}
+
+Route<dynamic> onGenerateRouteHelper(
+  RouteSettings settings, {
+  Widget notFoundFallback,
+  Object arguments,
+  WidgetBuilder builder,
+}) {
+  arguments ??= settings.arguments;
+
+  final RouteResult routeResult = getRouteResult(
+    name: settings.name,
+    arguments: arguments as Map<String, dynamic>,
+  );
+  if (routeResult.showStatusBar != null || routeResult.routeName != null) {
+    settings = FFRouteSettings(
+      name: settings.name,
+      routeName: routeResult.routeName,
+      arguments: arguments as Map<String, dynamic>,
+      showStatusBar: routeResult.showStatusBar,
+    );
+  }
+  Widget page = routeResult.widget ?? notFoundFallback;
+  if (page == null) {
+    throw Exception(
+      '''Route "${settings.name}" returned null. Route Widget must never return null,
+          maybe the reason is that route name did not match with right path.
+          You can use parameter[notFoundFallback] to avoid this ugly error.''',
+    );
+  }
+
+  if (arguments is Map<String, dynamic>) {
+    final RouteBuilder builder = arguments['routeBuilder'] as RouteBuilder;
+    if (builder != null) {
+      return builder(page);
+    }
+  }
+
+  if (builder != null) {
+    page = builder(page, routeResult);
+  }
+
+  switch (routeResult.pageRouteType) {
+    case PageRouteType.material:
+      return MaterialPageRoute<dynamic>(
+        settings: settings,
+        builder: (BuildContext _) => page,
+      );
+    case PageRouteType.cupertino:
+      return CupertinoPageRoute<dynamic>(
+        settings: settings,
+        builder: (BuildContext _) => page,
+      );
+    case PageRouteType.transparent:
+      return FFTransparentPageRoute<dynamic>(
+        settings: settings,
+        pageBuilder: (
+          BuildContext _,
+          Animation<double> __,
+          Animation<double> ___,
+        ) =>
+            page,
+      );
+    default:
+      return kIsWeb || !Platform.isIOS
+          ? MaterialPageRoute<dynamic>(
+              settings: settings,
+              builder: (BuildContext _) => page,
+            )
+          : CupertinoPageRoute<dynamic>(
+              settings: settings,
+              builder: (BuildContext _) => page,
+            );
+  }
+}
+
+typedef RouteBuilder = PageRoute<dynamic> Function(Widget page);
+
+class FFRouteSettings extends RouteSettings {
+  const FFRouteSettings({
+    this.routeName,
+    this.showStatusBar,
+    String name,
+    Object arguments,
+  }) : super(
+          name: name,
+          arguments: arguments,
+        );
+
+  final String routeName;
+  final bool showStatusBar;
+}
+
+/// Signature for a function that creates a widget, e.g.
+typedef WidgetBuilder = Widget Function(Widget child, RouteResult routeResult);

example/lib/example_routes.dart

+// GENERATED CODE - DO NOT MODIFY MANUALLY
+// **************************************************************************
+// Auto generated by https://github.com/fluttercandies/ff_annotation_route
+// **************************************************************************
+const List<String> routeNames = <String>[
+  'fluttercandies://custom_scrollview',
+  'fluttercandies://demogrouppage',
+  'fluttercandies://known-sized',
+  'fluttercandies://mainpage',
+  'fluttercandies://random-sized',
+  'fluttercandies://variable-sized',
+];
+
+class Routes {
+  const Routes._();
+
+  /// 'show how to build waterfall flow in CustomScrollview.'
+  ///
+  /// [name] : 'fluttercandies://custom_scrollview'
+  ///
+  /// [routeName] : 'custom_scrollview'
+  ///
+  /// [description] : 'show how to build waterfall flow in CustomScrollview.'
+  ///
+  /// [exts] : {group: Simple, order: 1}
+  static const String fluttercandiesCustomScrollview =
+      'fluttercandies://custom_scrollview';
+
+  /// 'DemoGroupPage'
+  ///
+  /// [name] : 'fluttercandies://demogrouppage'
+  ///
+  /// [routeName] : 'DemoGroupPage'
+  ///
+  /// [constructors] :
+  ///
+  /// DemoGroupPage : [MapEntry<String, List<DemoRouteResult>> keyValue]
+  static const String fluttercandiesDemogrouppage =
+      'fluttercandies://demogrouppage';
+
+  /// 'show how to build a known-sized item with waterfall flow list.'
+  ///
+  /// [name] : 'fluttercandies://known-sized'
+  ///
+  /// [routeName] : 'known-sized'
+  ///
+  /// [description] : 'show how to build a known-sized item with waterfall flow list.'
+  ///
+  /// [exts] : {group: Complex, order: 1}
+  static const String fluttercandiesKnownSized = 'fluttercandies://known-sized';
+
+  /// 'MainPage'
+  ///
+  /// [name] : 'fluttercandies://mainpage'
+  ///
+  /// [routeName] : 'MainPage'
+  ///
+  /// [constructors] :
+  ///
+  /// MainPage : []
+  static const String fluttercandiesMainpage = 'fluttercandies://mainpage';
+
+  /// 'show how to build random-sized item with waterfall flow list.'
+  ///
+  /// [name] : 'fluttercandies://random-sized'
+  ///
+  /// [routeName] : 'random-sized'
+  ///
+  /// [description] : 'show how to build random-sized item with waterfall flow list.'
+  ///
+  /// [exts] : {group: Simple, order: 0}
+  static const String fluttercandiesRandomSized =
+      'fluttercandies://random-sized';
+
+  /// 'show how to build a variable-sized item with waterfall flow list.'
+  ///
+  /// [name] : 'fluttercandies://variable-sized'
+  ///
+  /// [routeName] : 'variable-sized'
+  ///
+  /// [description] : 'show how to build a variable-sized item with waterfall flow list.'
+  ///
+  /// [exts] : {group: Complex, order: 1}
+  static const String fluttercandiesVariableSized =
+      'fluttercandies://variable-sized';
+}

example/lib/main.dart

+import 'package:flutter/cupertino.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_sliver_tracker/flutter_sliver_tracker.dart';
+import 'package:waterfall_flow/waterfall_flow.dart';
+
+void main() => runApp(MyApp());
+
+class MyApp extends StatelessWidget {
+  // This widget is the root of your application.
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: '封装曝光',
+      debugShowCheckedModeBanner: false,
+      theme: ThemeData(primarySwatch: Colors.blue),
+      home: const HomePage(),
+    );
+  }
+}
+
+
+class HomePage extends StatefulWidget {
+  const HomePage({ Key key }) : super(key: key);
+
+  @override
+  _HomePageState createState() => _HomePageState();
+}
+
+class _HomePageState extends State<HomePage> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title:const Text('组件曝光测试'),centerTitle: true,),
+      body: _buildBody(),
+    );
+  }
+  
+  Widget _buildBody(){
+    return XXSliverWaterFallFlow(
+      onScrollInit:(int firstIndex, int lastIndex){
+        print('初始化显示的 =========> $firstIndex    $lastIndex');
+      },
+      onScrollEnd:(int firstIndex, int lastIndex){
+        print('滑动结束显示的 =========> $firstIndex    $lastIndex');
+      },
+      itemBuilder: (BuildContext context, int index) {
+        return Container(
+          height:120,
+          color: Colors.red.withAlpha(20 * index),
+          alignment: Alignment.center,
+          child: Text('$index'),
+        );
+      }
+    );
+  }
+}
\ No newline at end of file

example/lib/pages/main_page.dart

+import 'package:example/example_routes.dart';
+import 'package:flutter/material.dart';
+import 'package:ff_annotation_route/ff_annotation_route.dart';
+import 'package:collection/collection.dart';
+import '../example_route.dart';
+import '../example_routes.dart' as example_routes;
+
+@FFRoute(
+  name: 'fluttercandies://mainpage',
+  routeName: 'MainPage',
+)
+class MainPage extends StatelessWidget {
+  MainPage() {
+    final List<String> routeNames = <String>[];
+    routeNames.addAll(example_routes.routeNames);
+    routeNames.remove(Routes.fluttercandiesMainpage);
+    routeNames.remove(Routes.fluttercandiesDemogrouppage);
+    routesGroup.addAll(groupBy<DemoRouteResult, String>(
+        routeNames
+            .map<RouteResult>((String name) => getRouteResult(name: name))
+            .where((RouteResult element) => element.exts != null)
+            .map<DemoRouteResult>((RouteResult e) => DemoRouteResult(e))
+            .toList()
+              ..sort((DemoRouteResult a, DemoRouteResult b) =>
+                  b.group.compareTo(a.group)),
+        (DemoRouteResult x) => x.group));
+  }
+  final Map<String, List<DemoRouteResult>> routesGroup =
+      <String, List<DemoRouteResult>>{};
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('曝光测试'),
+      ),
+      body: ListView.builder(
+        itemBuilder: (BuildContext c, int index) {
+          final String type = routesGroup.keys.toList()[index];
+          return Container(
+              margin: const EdgeInsets.all(20.0),
+              child: GestureDetector(
+                behavior: HitTestBehavior.translucent,
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: <Widget>[
+                    Text(
+                      (index + 1).toString() + '.' + type,
+                      //style: TextStyle(inherit: false),
+                    ),
+                    Text(
+                      '$type 曝光测试',
+                      style: const TextStyle(color: Colors.grey),
+                    )
+                  ],
+                ),
+                onTap: () {
+                  Navigator.pushNamed(
+                      context, Routes.fluttercandiesDemogrouppage,
+                      arguments: <String, dynamic>{
+                        'keyValue': routesGroup.entries.toList()[index],
+                      });
+                },
+              ));
+        },
+        itemCount: routesGroup.length,
+      ),
+    );
+  }
+}
+
+@FFRoute(
+  name: 'fluttercandies://demogrouppage',
+  routeName: 'DemoGroupPage',
+)
+class DemoGroupPage extends StatelessWidget {
+  DemoGroupPage({MapEntry<String, List<DemoRouteResult>> keyValue})
+      : routes = keyValue.value
+          ..sort((DemoRouteResult a, DemoRouteResult b) =>
+              a.order.compareTo(b.order)),
+        group = keyValue.key;
+  final List<DemoRouteResult> routes;
+  final String group;
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('$group demos'),
+      ),
+      body: ListView.builder(
+        itemBuilder: (BuildContext context, int index) {
+          final DemoRouteResult page = routes[index];
+          return Container(
+            margin: const EdgeInsets.all(20.0),
+            child: GestureDetector(
+              behavior: HitTestBehavior.translucent,
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: <Widget>[
+                  Text(
+                    (index + 1).toString() + '.' + page.routeResult.routeName,
+                    //style: TextStyle(inherit: false),
+                  ),
+                  Text(
+                    page.routeResult.description,
+                    style: const TextStyle(color: Colors.grey),
+                  )
+                ],
+              ),
+              onTap: () {
+                Navigator.pushNamed(context, page.routeResult.name);
+              },
+            ),
+          );
+        },
+        itemCount: routes.length,
+      ),
+    );
+  }
+}
+
+class DemoRouteResult {
+  DemoRouteResult(
+    this.routeResult,
+  )   : order = routeResult.exts['order'] as int,
+        group = routeResult.exts['group'] as String;
+
+  final int order;
+  final String group;
+  final RouteResult routeResult;
+}

example/lib/pages/simple/custom_scrollView_demo.dart

+///
+///  create by zmtzawqlp on 2019/11/19
+///
+import 'dart:math';
+import 'package:ff_annotation_route/ff_annotation_route.dart';
+import 'package:flutter/material.dart';
+import 'package:waterfall_flow/waterfall_flow.dart';
+
+@FFRoute(
+  name: 'fluttercandies://custom_scrollview',
+  routeName: 'custom_scrollview',
+  description: 'show how to build waterfall flow in CustomScrollview.',
+  exts: <String, dynamic>{
+    'group': 'Simple',
+    'order': 1,
+  },
+)
+class CustomScrollviewDemo extends StatefulWidget {
+  @override
+  _CustomScrollviewDemoState createState() => _CustomScrollviewDemoState();
+}
+
+class _CustomScrollviewDemoState extends State<CustomScrollviewDemo> {
+  List<Color> colors = <Color>[];
+  int crossAxisCount = 4;
+  double crossAxisSpacing = 5.0;
+  double mainAxisSpacing = 5.0;
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: CustomScrollView(
+        slivers: <Widget>[
+          SliverToBoxAdapter(
+            child: Container(
+              height: 200,
+              color: Colors.red,
+              alignment: Alignment.center,
+              child: const Text(
+                'I\'m other slivers',
+                style: TextStyle(
+                  color: Colors.white,
+                  fontSize: 20,
+                ),
+              ),
+            ),
+          ),
+          SliverWaterfallFlow(
+            gridDelegate: SliverWaterfallFlowDelegateWithFixedCrossAxisCount(
+              crossAxisCount: crossAxisCount,
+              crossAxisSpacing: crossAxisSpacing,
+              mainAxisSpacing: mainAxisSpacing,
+              collectGarbage: (List<int> garbages) {
+                print('collect garbage : $garbages');
+              },
+              viewportBuilder: (int firstIndex, int lastIndex) {
+                print('viewport : [$firstIndex,$lastIndex]');
+              },
+            ),
+            delegate: SliverChildBuilderDelegate((BuildContext c, int index) {
+              final Color color = getRandomColor(index);
+              return Container(
+                decoration: BoxDecoration(
+                    border: Border.all(color: Colors.black),
+                    color: getRandomColor(index)),
+                alignment: Alignment.center,
+                child: Text(
+                  '$index',
+                  style: TextStyle(
+                      color: color.computeLuminance() < 0.5
+                          ? Colors.white
+                          : Colors.black),
+                ),
+                //height: index == 5 ? 1500.0 : 100.0,
+                height: ((index % 3) + 1) * 100.0,
+              );
+            }),
+          )
+        ],
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: () {
+          setState(() {
+            crossAxisCount++;
+            //mainAxisSpacing+=5.0;
+            //crossAxisSpacing+=5.0;
+          });
+        },
+        child: const Icon(Icons.add),
+      ),
+    );
+  }
+
+  Color getRandomColor(int index) {
+    if (index >= colors.length) {
+      colors.add(Color.fromARGB(255, Random.secure().nextInt(255),
+          Random.secure().nextInt(255), Random.secure().nextInt(255)));
+    }
+
+    return colors[index];
+  }
+}

example/lib/pages/simple/random_sized_demo.dart

+///
+///  create by zmtzawqlp on 2019/11/19
+///
+import 'dart:math';
+import 'package:ff_annotation_route/ff_annotation_route.dart';
+import 'package:flutter/material.dart';
+import 'package:waterfall_flow/waterfall_flow.dart';
+
+@FFRoute(
+  name: 'fluttercandies://random-sized',
+  routeName: 'random-sized',
+  description: 'show how to build random-sized item with waterfall flow list.',
+  exts: <String, dynamic>{
+    'group': 'Simple',
+    'order': 0,
+  },
+)
+class RandomSizedDemo extends StatefulWidget {
+  @override
+  _RandomSizedDemoState createState() => _RandomSizedDemoState();
+}
+
+class _RandomSizedDemoState extends State<RandomSizedDemo> {
+  List<Color> colors = <Color>[];
+  int crossAxisCount = 4;
+  double crossAxisSpacing = 5.0;
+  double mainAxisSpacing = 5.0;
+  TextDirection textDirection = TextDirection.ltr;
+  int length = 100;
+  ScrollController controller = ScrollController();
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Directionality(
+        textDirection: textDirection,
+        child: WaterfallFlow.builder(
+          //cacheExtent: 0.0,
+          //reverse: true,
+          padding: const EdgeInsets.all(5.0),
+          gridDelegate: SliverWaterfallFlowDelegateWithFixedCrossAxisCount(
+            crossAxisCount: crossAxisCount,
+            crossAxisSpacing: crossAxisSpacing,
+            mainAxisSpacing: mainAxisSpacing,
+            // collectGarbage: (List<int> garbages) {
+            //   print('collect garbage : $garbages');
+            // },
+            // viewportBuilder: (int firstIndex, int lastIndex) {
+            //   print('viewport : [$firstIndex,$lastIndex]');
+            // },
+          ),
+          itemBuilder: (BuildContext c, int index) {
+            final Color color = getRandomColor(index);
+
+            return Container(
+              decoration: BoxDecoration(
+                  border: Border.all(color: Colors.black),
+                  color: getRandomColor(index)),
+              alignment: Alignment.center,
+              child: Text(
+                '$index ' + 'TestString' * 10 * (index % 3 + 1),
+                style: TextStyle(
+                    color: color.computeLuminance() < 0.5
+                        ? Colors.white
+                        : Colors.black),
+              ),
+              //height: ((index % 3) + 1) * 100.0,
+            );
+          },
+          //itemCount: 19,
+          itemCount: length,
+        ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: () {
+          setState(() {
+            // if (textDirection == TextDirection.ltr) {
+            //   textDirection = TextDirection.rtl;
+            // } else {
+            //   textDirection = TextDirection.ltr;
+            // }
+            //length=0;
+            crossAxisCount++;
+            //mainAxisSpacing += 5.0;
+            //crossAxisSpacing+=5.0;
+          });
+        },
+        child: const Icon(Icons.add),
+      ),
+    );
+  }
+
+  Color getRandomColor(int index) {
+    if (index >= colors.length) {
+      colors.add(Color.fromARGB(255, Random.secure().nextInt(255),
+          Random.secure().nextInt(255), Random.secure().nextInt(255)));
+    }
+
+    return colors[index];
+  }
+}

example/macos/.gitignore

+# Flutter-related
+**/Flutter/ephemeral/
+**/Pods/
+
+# Xcode-related
+**/xcuserdata/

example/macos/Flutter/Flutter-Debug.xcconfig

+#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
+#include "ephemeral/Flutter-Generated.xcconfig"

example/macos/Flutter/Flutter-Release.xcconfig

+#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
+#include "ephemeral/Flutter-Generated.xcconfig"

example/macos/Flutter/GeneratedPluginRegistrant.swift

+//
+//  Generated file. Do not edit.
+//
+
+import FlutterMacOS
+import Foundation
+
+import path_provider_macos
+
+func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
+  PathProviderPlugin.register(with: registry.registrar(forPlugin: "PathProviderPlugin"))
+}

example/macos/Podfile

+platform :osx, '10.11'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+  'Debug' => :debug,
+  'Profile' => :release,
+  'Release' => :release,
+}
+
+def parse_KV_file(file, separator='=')
+  file_abs_path = File.expand_path(file)
+  if !File.exists? file_abs_path
+    return [];
+  end
+  pods_ary = []
+  skip_line_start_symbols = ["#", "/"]
+  File.foreach(file_abs_path) { |line|
+      next if skip_line_start_symbols.any? { |symbol| line =~ /^\s*#{symbol}/ }
+      plugin = line.split(pattern=separator)
+      if plugin.length == 2
+        podname = plugin[0].strip()
+        path = plugin[1].strip()
+        podpath = File.expand_path("#{path}", file_abs_path)
+        pods_ary.push({:name => podname, :path => podpath});
+      else
+        puts "Invalid plugin specification: #{line}"
+      end
+  }
+  return pods_ary
+end
+
+def pubspec_supports_macos(file)
+  file_abs_path = File.expand_path(file)
+  if !File.exists? file_abs_path
+    return false;
+  end
+  File.foreach(file_abs_path) { |line|
+    return true if line =~ /^\s*macos:/
+  }
+  return false
+end
+
+target 'Runner' do
+  use_frameworks!
+  use_modular_headers!
+
+  # Prepare symlinks folder. We use symlinks to avoid having Podfile.lock
+  # referring to absolute paths on developers' machines.
+  ephemeral_dir = File.join('Flutter', 'ephemeral')
+  symlink_dir = File.join(ephemeral_dir, '.symlinks')
+  symlink_plugins_dir = File.join(symlink_dir, 'plugins')
+  system("rm -rf #{symlink_dir}")
+  system("mkdir -p #{symlink_plugins_dir}")
+
+  # Flutter Pods
+  generated_xcconfig = parse_KV_file(File.join(ephemeral_dir, 'Flutter-Generated.xcconfig'))
+  if generated_xcconfig.empty?
+    puts "Flutter-Generated.xcconfig must exist. If you're running pod install manually, make sure flutter packages get is executed first."
+  end
+  generated_xcconfig.map { |p|
+    if p[:name] == 'FLUTTER_FRAMEWORK_DIR'
+      symlink = File.join(symlink_dir, 'flutter')
+      File.symlink(File.dirname(p[:path]), symlink)
+      pod 'FlutterMacOS', :path => File.join(symlink, File.basename(p[:path]))
+    end
+  }
+
+  # Plugin Pods
+  plugin_pods = parse_KV_file('../.flutter-plugins')
+  plugin_pods.map { |p|
+    symlink = File.join(symlink_plugins_dir, p[:name])
+    File.symlink(p[:path], symlink)
+    if pubspec_supports_macos(File.join(symlink, 'pubspec.yaml'))
+      pod p[:name], :path => File.join(symlink, 'macos')
+    end
+  }
+end
+
+# Prevent Cocoapods from embedding a second Flutter framework and causing an error with the new Xcode build system.
+install! 'cocoapods', :disable_input_output_paths => true

example/macos/Podfile.lock

+PODS:
+  - FlutterMacOS (1.0.0)
+  - path_provider (0.0.1)
+  - path_provider_macos (0.0.1):
+    - FlutterMacOS
+
+DEPENDENCIES:
+  - FlutterMacOS (from `Flutter/ephemeral/.symlinks/flutter/darwin-x64`)
+  - path_provider (from `Flutter/ephemeral/.symlinks/plugins/path_provider/macos`)
+  - path_provider_macos (from `Flutter/ephemeral/.symlinks/plugins/path_provider_macos/macos`)
+
+EXTERNAL SOURCES:
+  FlutterMacOS:
+    :path: Flutter/ephemeral/.symlinks/flutter/darwin-x64
+  path_provider:
+    :path: Flutter/ephemeral/.symlinks/plugins/path_provider/macos
+  path_provider_macos:
+    :path: Flutter/ephemeral/.symlinks/plugins/path_provider_macos/macos
+
+SPEC CHECKSUMS:
+  FlutterMacOS: 15bea8a44d2fa024068daa0140371c020b4b6ff9
+  path_provider: e0848572d1d38b9a7dd099e79cf83f5b7e2cde9f
+  path_provider_macos: a0a3fd666cb7cd0448e936fb4abad4052961002b
+
+PODFILE CHECKSUM: d8ba9b3e9e93c62c74a660b46c6fcb09f03991a7
+
+COCOAPODS: 1.9.3

example/macos/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

example/macos/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1000"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "33CC10EC2044A3C60003C045"
+               BuildableName = "example.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "00380F9121DF178D00097171"
+               BuildableName = "RunnerUITests.xctest"
+               BlueprintName = "RunnerUITests"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "33CC10EC2044A3C60003C045"
+            BuildableName = "example.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "33CC10EC2044A3C60003C045"
+            BuildableName = "example.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "33CC10EC2044A3C60003C045"
+            BuildableName = "example.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

example/macos/Runner.xcworkspace/contents.xcworkspacedata

+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+   <FileRef
+      location = "group:Pods/Pods.xcodeproj">
+   </FileRef>
+</Workspace>

example/macos/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

example/macos/Runner/AppDelegate.swift

+import Cocoa
+import FlutterMacOS
+
+@NSApplicationMain
+class AppDelegate: FlutterAppDelegate {
+  override func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
+    return true
+  }
+}

example/macos/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

+{
+  "images" : [
+    {
+      "size" : "16x16",
+      "idiom" : "mac",
+      "filename" : "app_icon_16.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "16x16",
+      "idiom" : "mac",
+      "filename" : "app_icon_32.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "32x32",
+      "idiom" : "mac",
+      "filename" : "app_icon_32.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "32x32",
+      "idiom" : "mac",
+      "filename" : "app_icon_64.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "128x128",
+      "idiom" : "mac",
+      "filename" : "app_icon_128.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "128x128",
+      "idiom" : "mac",
+      "filename" : "app_icon_256.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "256x256",
+      "idiom" : "mac",
+      "filename" : "app_icon_256.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "256x256",
+      "idiom" : "mac",
+      "filename" : "app_icon_512.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "512x512",
+      "idiom" : "mac",
+      "filename" : "app_icon_512.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "512x512",
+      "idiom" : "mac",
+      "filename" : "app_icon_1024.png",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}