refs #22: add keyboardType parameter and close keyboard using drag gesture

lib/src/message_input.dart

@@ -62,6 +62,7 @@ class MessageInput extends StatefulWidget {
     this.parentMessage,
     this.editMessage,
     this.maxHeight = 150,
+    this.keyboardType = TextInputType.multiline,
   }) : super(key: key);
 
   /// Message to edit
@@ -76,6 +77,9 @@ class MessageInput extends StatefulWidget {
   /// Maximum Height for the TextField to grow before it starts scrolling
   final double maxHeight;
 
+  /// The keyboard type assigned to the TextField
+  final TextInputType keyboardType;
+
   @override
   _MessageInputState createState() => _MessageInputState();
 }
@@ -93,6 +97,12 @@ class _MessageInputState extends State<MessageInput> {
   @override
   Widget build(BuildContext context) {
     return SafeArea(
+      child: GestureDetector(
+        onPanUpdate: (details) {
+          if (details.delta.dy > 0) {
+            _focusNode.unfocus();
+          }
+        },
         child: Padding(
           padding: const EdgeInsets.all(8.0),
           child: Stack(
@@ -109,6 +119,7 @@ class _MessageInputState extends State<MessageInput> {
             ],
           ),
         ),
+      ),
     );
   }
 
@@ -147,7 +158,7 @@ class _MessageInputState extends State<MessageInput> {
           onSubmitted: (_) {
             _sendMessage(context);
           },
-          keyboardType: TextInputType.text,
+          keyboardType: widget.keyboardType,
           controller: _textController,
           focusNode: _focusNode,
           onChanged: (s) {