chore: update ChannelListHeaderTheme

packages/stream_chat_flutter/lib/src/channel_list_header.dart

@@ -45,7 +45,7 @@ typedef TitleBuilder = Widget Function(
 /// if you don't have it in the widget tree.
 ///
 /// The widget components render the ui based on the first ancestor of type
-/// [StreamChatTheme] and on its [ChannelListHeaderTheme] property.
+/// [StreamChatTheme] and on its [ChannelListHeaderThemeData] property.
 /// Modify it to change the widget appearance.
 class ChannelListHeader extends StatelessWidget implements PreferredSizeWidget {
   /// Instantiates a ChannelListHeader
@@ -115,6 +115,7 @@ class ChannelListHeader extends StatelessWidget implements PreferredSizeWidget {
         }
 
         final chatThemeData = StreamChatTheme.of(context);
+        final channelListHeaderThemeData = ChannelListHeaderTheme.of(context);
         return InfoTile(
           // ignore: avoid_bool_literals_in_conditional_expressions
           showMessage: showConnectionStateTile ? showStatus : false,
@@ -123,7 +124,7 @@ class ChannelListHeader extends StatelessWidget implements PreferredSizeWidget {
             textTheme: Theme.of(context).textTheme,
             brightness: Theme.of(context).brightness,
             elevation: 1,
-            backgroundColor: chatThemeData.channelListHeaderTheme.color,
+            backgroundColor: channelListHeaderThemeData.color,
             centerTitle: true,
             leading: leading ??
                 Center(
@@ -138,10 +139,10 @@ class ChannelListHeader extends StatelessWidget implements PreferredSizeWidget {
                                 }
                                 Scaffold.of(context).openDrawer();
                               },
-                          borderRadius: chatThemeData
-                              .channelListHeaderTheme.avatarTheme?.borderRadius,
-                          constraints: chatThemeData
-                              .channelListHeaderTheme.avatarTheme?.constraints,
+                          borderRadius: channelListHeaderThemeData
+                              .avatarTheme?.borderRadius,
+                          constraints: channelListHeaderThemeData
+                              .avatarTheme?.constraints,
                         )
                       : const Offstage(),
                 ),
@@ -227,10 +228,7 @@ class ChannelListHeader extends StatelessWidget implements PreferredSizeWidget {
           const SizedBox(width: 10),
           Text(
             'Searching for Network',
-            style: StreamChatTheme.of(context)
-                .channelListHeaderTheme
-                .title
-                ?.copyWith(
+            style: ChannelListHeaderTheme.of(context).titleStyle?.copyWith(
                   fontSize: 16,
                   fontWeight: FontWeight.bold,
                 ),
@@ -248,7 +246,7 @@ class ChannelListHeader extends StatelessWidget implements PreferredSizeWidget {
       children: [
         Text(
           'Offline...',
-          style: chatThemeData.channelListHeaderTheme.title?.copyWith(
+          style: chatThemeData.channelListHeaderTheme.titleStyle?.copyWith(
             fontSize: 16,
             fontWeight: FontWeight.bold,
           ),
@@ -259,7 +257,7 @@ class ChannelListHeader extends StatelessWidget implements PreferredSizeWidget {
             ..openConnection(),
           child: Text(
             'Try Again',
-            style: chatThemeData.channelListHeaderTheme.title?.copyWith(
+            style: chatThemeData.channelListHeaderTheme.titleStyle?.copyWith(
               fontSize: 16,
               fontWeight: FontWeight.bold,
               color: chatThemeData.colorTheme.accentPrimary,

packages/stream_chat_flutter/lib/src/stream_chat_theme.dart

@@ -47,7 +47,7 @@ class StreamChatThemeData {
     Brightness? brightness,
     TextTheme? textTheme,
     ColorTheme? colorTheme,
-    ChannelListHeaderTheme? channelListHeaderTheme,
+    ChannelListHeaderThemeData? channelListHeaderTheme,
     ChannelPreviewThemeData? channelPreviewTheme,
     ChannelHeaderThemeData? channelHeaderTheme,
     MessageThemeData? otherMessageTheme,
@@ -145,7 +145,7 @@ class StreamChatThemeData {
   final ChannelPreviewThemeData channelPreviewTheme;
 
   /// Theme of the [ChannelListHeader]
-  final ChannelListHeaderTheme channelListHeaderTheme;
+  final ChannelListHeaderThemeData channelListHeaderTheme;
 
   /// Theme of the chat widgets dedicated to a channel header
   final ChannelHeaderThemeData channelHeaderTheme;
@@ -200,7 +200,7 @@ class StreamChatThemeData {
     MessageInputThemeData? messageInputTheme,
     Widget Function(BuildContext, User)? defaultUserImage,
     IconThemeData? primaryIconTheme,
-    ChannelListHeaderTheme? channelListHeaderTheme,
+    ChannelListHeaderThemeData? channelListHeaderTheme,
     List<ReactionIcon>? reactionIcons,
     GalleryHeaderThemeData? galleryHeaderTheme,
     GalleryFooterThemeData? galleryFooterTheme,
@@ -312,7 +312,7 @@ class StreamChatThemeData {
         ),
       ),
       channelPreviewTheme: channelPreviewTheme,
-      channelListHeaderTheme: ChannelListHeaderTheme(
+      channelListHeaderTheme: ChannelListHeaderThemeData(
         avatarTheme: AvatarThemeData(
           borderRadius: BorderRadius.circular(20),
           constraints: const BoxConstraints.tightFor(
@@ -321,7 +321,7 @@ class StreamChatThemeData {
           ),
         ),
         color: colorTheme.barsBg,
-        title: textTheme.headlineBold,
+        titleStyle: textTheme.headlineBold,
       ),
       channelHeaderTheme: channelHeaderTheme,
       ownMessageTheme: MessageThemeData(

packages/stream_chat_flutter/lib/src/theme/channel_list_header_theme.dart

@@ -1,17 +1,63 @@
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
+import 'package:stream_chat_flutter/src/stream_chat_theme.dart';
 import 'package:stream_chat_flutter/src/theme/avatar_theme.dart';
 
-/// Theme dedicated to the [ChannelListHeader]
-class ChannelListHeaderTheme {
-  /// Returns a new [ChannelListHeaderTheme]
+/// Overrides the default style of [ChannelListHeader] descendants.
+///
+/// See also:
+///
+///  * [ChannelListHeaderThemeData], which is used to configure this theme.
+class ChannelListHeaderTheme extends InheritedTheme {
+  /// Creates a [ChannelListHeaderTheme].
+  ///
+  /// The [data] parameter must not be null.
   const ChannelListHeaderTheme({
-    this.title,
+    Key? key,
+    required this.data,
+    required Widget child,
+  }) : super(key: key, child: child);
+
+  /// The configuration of this theme.
+  final ChannelListHeaderThemeData data;
+
+  /// The closest instance of this class that encloses the given context.
+  ///
+  /// If there is no enclosing [ChannelListHeaderTheme] widget, then
+  /// [StreamChatThemeData.channelListHeaderTheme] is used.
+  ///
+  /// Typical usage is as follows:
+  ///
+  /// ```dart
+  /// final theme = ChannelListHeaderTheme.of(context);
+  /// ```
+  static ChannelListHeaderThemeData of(BuildContext context) {
+    final channelListHeaderTheme =
+        context.dependOnInheritedWidgetOfExactType<ChannelListHeaderTheme>();
+    return channelListHeaderTheme?.data ??
+        StreamChatTheme.of(context).channelListHeaderTheme;
+  }
+
+  @override
+  Widget wrap(BuildContext context, Widget child) =>
+      ChannelListHeaderTheme(data: data, child: child);
+
+  @override
+  bool updateShouldNotify(ChannelListHeaderTheme oldWidget) =>
+      data != oldWidget.data;
+}
+
+/// Theme dedicated to the [ChannelListHeader]
+class ChannelListHeaderThemeData with Diagnosticable {
+  /// Returns a new [ChannelListHeaderThemeData]
+  const ChannelListHeaderThemeData({
+    this.titleStyle,
     this.avatarTheme,
     this.color,
   });
 
   /// Style of the title text
-  final TextStyle? title;
+  final TextStyle? titleStyle;
 
   /// Theme dedicated to the userAvatar
   final AvatarThemeData? avatarTheme;
@@ -19,25 +65,61 @@ class ChannelListHeaderTheme {
   /// Background color of the appbar
   final Color? color;
 
-  /// Returns a new [ChannelListHeaderTheme] replacing some of its properties
-  ChannelListHeaderTheme copyWith({
-    TextStyle? title,
+  /// Returns a new [ChannelListHeaderThemeData] replacing some of its
+  /// properties
+  ChannelListHeaderThemeData copyWith({
+    TextStyle? titleStyle,
     AvatarThemeData? avatarTheme,
     Color? color,
   }) =>
-      ChannelListHeaderTheme(
-        title: title ?? this.title,
+      ChannelListHeaderThemeData(
+        titleStyle: titleStyle ?? this.titleStyle,
         avatarTheme: avatarTheme ?? this.avatarTheme,
         color: color ?? this.color,
       );
 
-  /// Merges [this] [ChannelListHeaderTheme] with the [other]
-  ChannelListHeaderTheme merge(ChannelListHeaderTheme? other) {
+  /// Linearly interpolate from one [ChannelListHeaderThemeData] to another.
+  ChannelListHeaderThemeData lerp(
+    ChannelListHeaderThemeData a,
+    ChannelListHeaderThemeData b,
+    double t,
+  ) =>
+      ChannelListHeaderThemeData(
+        avatarTheme:
+            const AvatarThemeData().lerp(a.avatarTheme!, b.avatarTheme!, t),
+        color: Color.lerp(a.color, b.color, t),
+        titleStyle: TextStyle.lerp(a.titleStyle, b.titleStyle, t),
+      );
+
+  /// Merges [this] [ChannelListHeaderThemeData] with the [other]
+  ChannelListHeaderThemeData merge(ChannelListHeaderThemeData? other) {
     if (other == null) return this;
     return copyWith(
-      title: title?.merge(other.title) ?? other.title,
+      titleStyle: titleStyle?.merge(other.titleStyle) ?? other.titleStyle,
       avatarTheme: avatarTheme?.merge(other.avatarTheme) ?? other.avatarTheme,
       color: other.color,
     );
   }
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is ChannelListHeaderThemeData &&
+          runtimeType == other.runtimeType &&
+          titleStyle == other.titleStyle &&
+          avatarTheme == other.avatarTheme &&
+          color == other.color;
+
+  @override
+  int get hashCode =>
+      titleStyle.hashCode ^ avatarTheme.hashCode ^ color.hashCode;
+
+  @override
+  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
+    super.debugFillProperties(properties);
+    properties
+      ..add(DiagnosticsProperty('titleStyle', titleStyle))
+      ..add(DiagnosticsProperty('avatarTheme', avatarTheme))
+      ..add(ColorProperty('color', color));
+  }
 }