Null safe (#101)

* Theme: 优化单例实现，初步优化 BrnAllThemeConfig 属性获取不为 null

* refactor:优化theme,暴露非null引用

* theme:去除无用信息及优化部分代码

* theme:增加属性类型

* 优化修复 EventBus

* 迁移example ，优化常量命名，增加export

* migrate brn_empty_status.dart

* 删除 BrnThemeImg

* fix:tagConfig merge方法增加判空处理

* fix:revert tagConfig

* fix:BrnAbnormalStateWidget空处理

* Migrated tabbar to null-safety

* Migrated scroll_anchor to null-safety

* fix:修复迁移tabar问题

* migrate form to null safety

* fix：修复tabbar报错及selection警告信息

* fix:修复迁移问题

* fix:优化迁移部分问题key和style非空问题

* migrate picker to null safety

* fix:修复picker空安全迁移问题

* fix:修复list没指定泛型及if判断错误问题

* fix:migrate dashed line to null safty

* migrate example to null safty

* fix:修复部分example warning

* fix:修复demo报错问题

* fix:追加未跟踪修复

* fix:优化部分接口可空参数为非空

* fix:修复tabar showmore overflow 问题 #98 以及 tabbar 标签颜色默认设置倒置问题

* refactor:优化 BrnInputItemType 常量命名

* refactor:优化枚举值命名

* fix:修改docs目录下form相关常量命名及所有枚举命名

* refactor: 更新 changelog

Co-authored-by: violinday <flwh123@sina.com>

CHANGELOG.md

@@ -1,4 +1,44 @@
-## [1.0.0] - first publish adapter flutter sdk 1.22.4
 
-## [2.0.0] - adapter flutter sdk 2.2.2
+
+## [2.1.0-Beta] - 2022-2-15
+### Changed
+
+#### base 
+
+- **Breaking change**: Sound null safety support, thanks to  @leftcoding #39#33 @donywan #20 @laiiihz #80#64#59#32#14  @kalifun #36 @jojinshallar #81#75#65#62#56#42 @junlandroid #73 @Kenneth #53 @HappyImp #55 @kkkman22 #23 @AlexV525 #30
+- **Breaking change**: Refer to the dart language specification to optimized constant and enum naming.
+- Replace <code>DIN Font</code> with <code>Bebas Font</code> .
+- Add build test thank to **AlexV525**.
+
+#### components
+- <code>BrnCalendarView</code>: add <code>BrnCalendarView.single()</code> and <code>BrnCalendarView.range()</code> constructor and had its argument <code>startEndDateChange</code> moved.
+- <code>BrnSelectionEntityListBean</code>: <code>fromMap</code> is renamed to <code>fromJson</code>.
+- <code>BrnRadioButton</code>: optimize click area [#31](https://github.com/LianjiaTech/bruno/pull/31) , thanks to **a1017480401** .
+- <code>BrnScrollableTextDialog</code>: remove Navigator.pop(context) in <code>onSubmit()</code> and hand it over to external processing (user).
+
+
+
+### Fixed
+
+- Fix example error [#71](https://github.com/LianjiaTech/bruno/issues/71) thanks to **leftcoding** fixing this issue.
+- Fix <code>BrnPickerTitleConfig</code>  <code>titleContent</code> setting is invalid  [#70](https://github.com/LianjiaTech/bruno/issues/70).
+- Optimize <code>BrnPopupWindow </code> <code>onItemClick</code>  logic  [#57 ](https://github.com/LianjiaTech/bruno/issues/57) .
+- Fix <code>BrnDialog</code>  is obscured  by keyboard  [#7](https://github.com/LianjiaTech/bruno/issues/7) .
+
+
+
+Thanks again to **leftcoding**,  **jojinshallar**,  **laiiihz**,  **donywan**,  **kalifun**,  **junlandroid**, **Kenneth**, **HappyImp**,  **kkkman22** , **a1017480401** and  **Alex**.
+
+
+
+## [2.0.0] - 2021-12-8
+
+- Adapt flutter sdk 2.2.2
+
+## [1.0.0] - 2021-12-7
+
+- First publish adapt flutter sdk 1.22.4
+
+
+