From d2430d760245e5031355e7cdf7b3e30e161e2539 Mon Sep 17 00:00:00 2001
From: Lex Lim <hyperzlib@outlook.com>
Date: Thu, 19 Jan 2023 17:30:49 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E5=BA=95=E9=83=A8=E5=AF=BC?=
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---
 lib/components/bottom_nav_bar.dart | 128 +++++++++++++++++++++++++++++
 lib/pages/article.dart             |   2 +
 2 files changed, 130 insertions(+)
 create mode 100644 lib/components/bottom_nav_bar.dart

diff --git a/lib/components/bottom_nav_bar.dart b/lib/components/bottom_nav_bar.dart
new file mode 100644
index 0000000..fe8b4f7
--- /dev/null
+++ b/lib/components/bottom_nav_bar.dart
@@ -0,0 +1,128 @@
+import 'dart:ui';
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/services.dart';
+import 'package:get/get.dart';
+
+/// Standard iOS navigation bar height without the status bar.
+///
+/// This height is constant and independent of accessibility as it is in iOS.
+const double _kNavBarPersistentHeight = kMinInteractiveDimensionCupertino;
+
+const Color _kDefaultNavBarBorderColor = Color(0x4D000000);
+
+const Border _kDefaultNavBarBorder = Border(
+  top: BorderSide(
+    color: _kDefaultNavBarBorderColor,
+    width: 0.0, // 0.0 means one physical pixel
+  ),
+);
+
+/// Returns `child` wrapped with background and a bottom border if background color
+/// is opaque. Otherwise, also blur with [BackdropFilter].
+///
+/// When `updateSystemUiOverlay` is true, the nav bar will update the OS
+/// status bar's color theme based on the background color of the nav bar.
+Widget _wrapWithBackground({
+  Border? border,
+  required Color backgroundColor,
+  Brightness? brightness,
+  required Widget child,
+  bool updateSystemUiOverlay = true,
+}) {
+  Widget result = child;
+  if (updateSystemUiOverlay) {
+    final bool isDark = backgroundColor.computeLuminance() < 0.179;
+    final Brightness newBrightness = brightness ?? (isDark ? Brightness.dark : Brightness.light);
+    final SystemUiOverlayStyle overlayStyle;
+    switch (newBrightness) {
+      case Brightness.dark:
+        overlayStyle = SystemUiOverlayStyle.light;
+        break;
+      case Brightness.light:
+        overlayStyle = SystemUiOverlayStyle.dark;
+        break;
+    }
+    result = AnnotatedRegion<SystemUiOverlayStyle>(
+      value: overlayStyle,
+      child: result,
+    );
+  }
+  final DecoratedBox childWithBackground = DecoratedBox(
+    decoration: BoxDecoration(
+      border: border,
+      color: backgroundColor,
+    ),
+    child: result,
+  );
+
+  if (backgroundColor.alpha == 0xFF) {
+    return childWithBackground;
+  }
+
+  return ClipRect(
+    child: BackdropFilter(
+      filter: ImageFilter.blur(sigmaX: 10.0, sigmaY: 10.0),
+      child: childWithBackground,
+    ),
+  );
+}
+
+class BottomNavigationBar extends StatefulWidget implements ObstructingPreferredSizeWidget {
+  final Widget child;
+  final Color? backgroundColor;
+  final Brightness? brightness;
+  final Border? border;
+
+  const BottomNavigationBar({
+    super.key,
+    required this.child,
+    this.backgroundColor,
+    this.brightness,
+    this.border = _kDefaultNavBarBorder,
+  });
+
+  @override
+  bool shouldFullyObstruct(BuildContext context) {
+    final Color backgroundColor =
+        CupertinoDynamicColor.maybeResolve(this.backgroundColor, context) ??
+            CupertinoTheme.of(context).barBackgroundColor;
+    return backgroundColor.alpha == 0xFF;
+  }
+
+  @override
+  Size get preferredSize {
+    double scaleFactor = MediaQuery.of(Get.context!).textScaleFactor;
+    return Size.fromHeight(_kNavBarPersistentHeight * scaleFactor);
+  }
+
+  @override
+  State<StatefulWidget> createState() => _BottomNavigationBarState();
+}
+
+class _BottomNavigationBarState extends State<BottomNavigationBar> {
+  @override
+  Widget build(BuildContext context) {
+    final Color backgroundColor =
+        CupertinoDynamicColor.maybeResolve(widget.backgroundColor, context) ??
+            CupertinoTheme.of(context).barBackgroundColor;
+
+    final scaleFactor = MediaQuery.of(context).textScaleFactor;
+
+    return _wrapWithBackground(
+      border: widget.border,
+      backgroundColor: backgroundColor,
+      brightness: widget.brightness,
+      child: DefaultTextStyle(
+        style: CupertinoTheme.of(context).textTheme.textStyle,
+        child: SizedBox(
+          height: (_kNavBarPersistentHeight * scaleFactor) + MediaQuery.of(context).padding.bottom,
+          child: SafeArea(
+            top: false,
+            child: widget.child,
+          ),
+        ),
+      ),
+    );
+  }
+}
diff --git a/lib/pages/article.dart b/lib/pages/article.dart
index 8030c6a..edb2fa9 100755
--- a/lib/pages/article.dart
+++ b/lib/pages/article.dart
@@ -6,6 +6,7 @@ import 'package:isekai_wiki/api/mw/mw_api.dart';
 import 'package:isekai_wiki/api/mw/parse.dart';
 import 'package:isekai_wiki/api/response/page_info.dart';
 import 'package:isekai_wiki/api/response/parse.dart';
+import 'package:isekai_wiki/components/bottom_nav_bar.dart';
 import 'package:isekai_wiki/components/safearea_builder.dart';
 import 'package:isekai_wiki/components/wikipage_parser.dart';
 import 'package:isekai_wiki/reactive/reactive.dart';
@@ -114,6 +115,7 @@ class _ArticlePageState extends ReactiveState<ArticlePage> {
       navigationBar: IsekaiNavigationBar(
         middle: Obx(() => Text(c.displayTitle.value)),
       ),
+      bottomNavigationBar: BottomNavigationBar(child: SizedBox()),
       child: SafeAreaBuilder(
         builder: (context, padding) => Obx(
           () => WikiPageParser(