feat: Added message input theme and send button animation duration

packages/stream_chat_flutter/lib/src/message_input.dart

@@ -392,7 +392,8 @@ class MessageInputState extends State<MessageInput> {
             : CrossFadeState.showSecond,
         firstChild: _buildSendButton(context),
         secondChild: _buildIdleSendButton(context),
-        duration: Duration(milliseconds: 300),
+        duration:
+            StreamChatTheme.of(context).messageInputTheme.sendAnimationDuration,
         alignment: Alignment.center,
       ),
     );

packages/stream_chat_flutter/lib/src/stream_chat_theme.dart

@@ -60,6 +60,9 @@ class StreamChatThemeData {
   /// Theme of other users messages
   final MessageTheme otherMessageTheme;
 
+  /// Theme of other users messages
+  final MessageInputTheme messageInputTheme;
+
   /// The widget that will be built when the channel image is unavailable
   final Widget Function(BuildContext, Channel) defaultChannelImage;
 
@@ -80,6 +83,7 @@ class StreamChatThemeData {
     this.channelTheme,
     this.otherMessageTheme,
     this.ownMessageTheme,
+    this.messageInputTheme,
     this.defaultChannelImage,
     this.defaultUserImage,
     this.primaryIconTheme,
@@ -108,6 +112,7 @@ class StreamChatThemeData {
     ChannelTheme channelTheme,
     MessageTheme ownMessageTheme,
     MessageTheme otherMessageTheme,
+    MessageInputTheme messageInputTheme,
     Widget Function(BuildContext, Channel) defaultChannelImage,
     Widget Function(BuildContext, User) defaultUserImage,
     IconThemeData primaryIconTheme,
@@ -123,6 +128,7 @@ class StreamChatThemeData {
         channelTheme: channelTheme ?? this.channelTheme,
         ownMessageTheme: ownMessageTheme ?? this.ownMessageTheme,
         otherMessageTheme: otherMessageTheme ?? this.otherMessageTheme,
+        messageInputTheme: messageInputTheme ?? this.messageInputTheme,
         reactionIcons: reactionIcons ?? this.reactionIcons,
       );
 
@@ -143,6 +149,8 @@ class StreamChatThemeData {
           other.ownMessageTheme,
       otherMessageTheme: otherMessageTheme?.merge(other.otherMessageTheme) ??
           other.otherMessageTheme,
+      messageInputTheme: messageInputTheme?.merge(other.messageInputTheme) ??
+          other.messageInputTheme,
       reactionIcons: other.reactionIcons,
     );
   }
@@ -248,6 +256,9 @@ class StreamChatThemeData {
           ),
         ),
       ),
+      messageInputTheme: MessageInputTheme(
+        sendAnimationDuration: Duration(milliseconds: 7000),
+      ),
       reactionIcons: [
         ReactionIcon(
           type: 'love',
@@ -873,6 +884,27 @@ class ChannelHeaderTheme {
   }
 }
 
+class MessageInputTheme {
+  final Duration sendAnimationDuration;
+
+  const MessageInputTheme({
+    this.sendAnimationDuration,
+  });
+
+  MessageInputTheme copyWith({Duration sendAnimationDuration}) =>
+      MessageInputTheme(
+        sendAnimationDuration:
+            sendAnimationDuration ?? this.sendAnimationDuration,
+      );
+
+  MessageInputTheme merge(MessageInputTheme other) {
+    if (other == null) return this;
+    return copyWith(
+      sendAnimationDuration: other.sendAnimationDuration,
+    );
+  }
+}
+
 class Effect {
   final double sigmaX;
   final double sigmaY;