📝 Document (dartdoc) update.

Author: AlexV525

lib/src/constants/screens.dart

@@ -6,22 +6,40 @@ import 'dart:ui' as ui;
 
 import 'package:flutter/material.dart';
 
+/// Screens utils with multiple properties access.
+/// 获取屏幕各项属性的工具类
 class Screens {
   const Screens._();
 
+  /// Get [MediaQueryData] from [ui.window]
+  /// 通过 [ui.window] 获取 [MediaQueryData]
   static MediaQueryData get mediaQuery => MediaQueryData.fromWindow(ui.window);
 
+  /// The number of device pixels for each logical pixel.
+  /// 设备每个逻辑像素对应的dp比例
   static double get scale => mediaQuery.devicePixelRatio;
 
+  /// The horizontal extent of this size.
+  /// 水平范围的大小
   static double get width => mediaQuery.size.width;
 
+  /// The horizontal pixels of this size.
+  /// 水平范围的像素值
   static int get widthPixels => (width * scale).toInt();
 
+  /// The vertical extent of this size.
+  /// 垂直范围的大小
   static double get height => mediaQuery.size.height;
 
+  /// The vertical pixels of this size.
+  /// 垂直范围的像素值
   static int get heightPixels => (height * scale).toInt();
 
+  /// Top offset in the [ui.window], usually is the notch size.
+  /// 从 [ui.window] 获取的顶部偏移（间距），通常是刘海的大小。
   static double get topSafeHeight => mediaQuery.padding.top;
 
+  /// Bottom offset in the [ui.window], usually is the action bar/navigation bar size.
+  /// 从 [ui.window] 获取的底部偏移（间距），通常是操作条/导航条的大小。
   static double get bottomSafeHeight => mediaQuery.padding.bottom;
 }

lib/src/constants/text_delegate.dart

@@ -2,6 +2,9 @@
 /// [Author] Alex (https://github.com/AlexVincent525)
 /// [Date] 2020/4/7 10:25
 ///
+
+/// Text delegate that controls text in widgets.
+/// 控制部件中的文字实现
 abstract class TextDelegate {
   /// Confirm string for confirm button.
   /// 确认按钮的字段
@@ -52,6 +55,8 @@ abstract class TextDelegate {
   String videoIndicatorBuilder(Duration duration);
 }
 
+/// Default text delegate implements with Chinese.
+/// 中文文字实现
 class DefaultTextDelegate implements TextDelegate {
   factory DefaultTextDelegate() => _instance;
 

lib/src/widget/fixed_appbar.dart

@@ -8,6 +8,8 @@ import 'package:flutter/material.dart';
 
 import '../constants/constants.dart';
 
+/// A custom app bar.
+/// 自定义的顶栏
 class FixedAppBar extends StatelessWidget {
   const FixedAppBar({
     Key key,
@@ -23,15 +25,44 @@ class FixedAppBar extends StatelessWidget {
     this.blurRadius = 0.0,
   }) : super(key: key);
 
+  /// Title widget.
+  /// 标题部件
   final Widget title;
+
+  /// Leading widget.
+  /// 头部部件
   final Widget leading;
+
+  /// Action widgets.
+  /// 尾部操作部件
   final List<Widget> actions;
+
+  /// Padding for actions.
+  /// 尾部操作部分的内边距
   final EdgeInsetsGeometry actionsPadding;
+
+  /// Whether it should imply leading with [BackButton] automatically.
+  /// 是否会自动检测并添加返回按钮至头部
   final bool automaticallyImplyLeading;
+
+  /// Whether the [title] should be at the center of the [FixedAppBar].
+  /// [title] 是否会在正中间
   final bool centerTitle;
+
+  /// Background color.
+  /// 背景颜色
   final Color backgroundColor;
+
+  /// The size of the shadow below the app bar.
+  /// 底部阴影的大小
   final double elevation;
+
+  /// Height of the app bar.
+  /// 高度
   final double height;
+
+  /// Value that can enable the app bar using filter with [ui.ImageFilter]
+  /// 实现高斯模糊效果的值
   final double blurRadius;
 
   @override