feat: wip message input

lib/src/message_input.dart

@@ -230,6 +230,7 @@ class MessageInputState extends State<MessageInput> {
 
   Expanded _buildTextInput(BuildContext context) {
     return Expanded(
+      child: Center(
         child: LimitedBox(
           maxHeight: widget.maxHeight,
           child: TextField(
@@ -286,6 +287,7 @@ class MessageInputState extends State<MessageInput> {
             textCapitalization: TextCapitalization.sentences,
           ),
         ),
+      ),
     );
   }
 
@@ -602,8 +604,9 @@ class MessageInputState extends State<MessageInput> {
     }
   }
 
-  Material _buildAttachmentButton() {
+  Widget _buildAttachmentButton() {
-    return Material(
+    return Center(
+      child: Material(
         clipBehavior: Clip.hardEdge,
         shape: RoundedRectangleBorder(
           borderRadius: BorderRadius.circular(32),
@@ -620,6 +623,7 @@ class MessageInputState extends State<MessageInput> {
             angle: 0.4,
           ),
         ),
+      ),
     );
   }
 
@@ -845,7 +849,7 @@ class MessageInputState extends State<MessageInput> {
           child: Material(
             clipBehavior: Clip.hardEdge,
             shape: RoundedRectangleBorder(
-              borderRadius: BorderRadius.circular(24),
+              borderRadius: BorderRadius.circular(32),
             ),
             color: Colors.grey,
             child: IconButton(
@@ -856,6 +860,7 @@ class MessageInputState extends State<MessageInput> {
               icon: Icon(
                 Icons.arrow_forward,
                 color: Colors.white,
+                size: 18.0,
               ),
             ),
           ),
@@ -874,7 +879,7 @@ class MessageInputState extends State<MessageInput> {
           child: Material(
             clipBehavior: Clip.hardEdge,
             shape: RoundedRectangleBorder(
-              borderRadius: BorderRadius.circular(24),
+              borderRadius: BorderRadius.circular(32),
             ),
             color: StreamChatTheme.of(context).accentColor,
             child: IconButton(
@@ -885,6 +890,7 @@ class MessageInputState extends State<MessageInput> {
               icon: Icon(
                 Icons.arrow_upward,
                 color: Colors.white,
+                size: 18.0,
               ),
             ),
           ),