fixed send on enter param and added an example

example/lib/main.dart

@@ -2,6 +2,7 @@ import 'package:examples/samples/avatar.dart';
 import 'package:examples/samples/basic.dart';
 import 'package:examples/samples/media.dart';
 import 'package:examples/samples/quick_replies_sample.dart';
+import 'package:examples/samples/send_on_enter.dart';
 import 'package:examples/samples/typing_users_sample.dart';
 import 'package:flutter/material.dart';
 
@@ -59,6 +60,10 @@ class _MyHomePageState extends State<MyHomePage> {
               onPressed: () => push(TypingUsersSample()),
               child: const Text('Typing users'),
             ),
+            ElevatedButton(
+              onPressed: () => push(SendOnEnter()),
+              child: const Text('Send on enter'),
+            ),
           ],
         ),
       ),

example/lib/samples/send_on_enter.dart

@@ -0,0 +1,38 @@
+import 'package:dash_chat_2/dash_chat_2.dart';
+import 'package:examples/data.dart';
+import 'package:flutter/material.dart';
+
+class SendOnEnter extends StatefulWidget {
+  @override
+  _SendOnEnterState createState() => _SendOnEnterState();
+}
+
+class _SendOnEnterState extends State<SendOnEnter> {
+  List<ChatMessage> messages = basicSample;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('SendOnEnter example'),
+      ),
+      body: DashChat(
+        currentUser: user,
+        onSend: (ChatMessage m) {
+          setState(() {
+            messages.insert(0, m);
+          });
+        },
+        messages: messages,
+        inputOptions: const InputOptions(
+          sendOnEnter: true,
+        ),
+        messageListOptions: MessageListOptions(
+          onLoadEarlier: () async {
+            await Future.delayed(const Duration(seconds: 3));
+          },
+        ),
+      ),
+    );
+  }
+}

lib/src/widgets/input_toolbar/input_toolbar.dart

@@ -60,7 +60,9 @@ class _InputToolbarState extends State<InputToolbar> {
                       defaultInputDecoration(),
                   maxLength: widget.inputOptions.maxInputLength,
                   minLines: 1,
-                  maxLines: widget.inputOptions.inputMaxLines,
+                  maxLines: widget.inputOptions.sendOnEnter
+                      ? 1
+                      : widget.inputOptions.inputMaxLines,
                   cursorColor: widget.inputOptions.cursorStyle.color,
                   cursorWidth: widget.inputOptions.cursorStyle.width,
                   showCursor: !widget.inputOptions.cursorStyle.hide,