refactor: Split chat view into multiple files

lib/pages/chat/reply_display.dart

@@ -0,0 +1,77 @@
+import 'package:flutter/material.dart';
+
+import 'package:flutter_gen/gen_l10n/l10n.dart';
+import 'package:matrix/matrix.dart';
+
+import 'package:fluffychat/utils/matrix_sdk_extensions.dart/matrix_locals.dart';
+import 'chat.dart';
+import 'events/reply_content.dart';
+
+class ReplyDisplay extends StatelessWidget {
+  final ChatController controller;
+  const ReplyDisplay(this.controller, {Key key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return AnimatedContainer(
+      duration: const Duration(milliseconds: 300),
+      height: controller.editEvent != null || controller.replyEvent != null
+          ? 56
+          : 0,
+      child: Material(
+        color: Theme.of(context).secondaryHeaderColor,
+        child: Row(
+          children: <Widget>[
+            IconButton(
+              tooltip: L10n.of(context).close,
+              icon: const Icon(Icons.close),
+              onPressed: controller.cancelReplyEventAction,
+            ),
+            Expanded(
+              child: controller.replyEvent != null
+                  ? ReplyContent(controller.replyEvent,
+                      timeline: controller.timeline)
+                  : _EditContent(controller.editEvent
+                      ?.getDisplayEvent(controller.timeline)),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _EditContent extends StatelessWidget {
+  final Event event;
+
+  const _EditContent(this.event);
+
+  @override
+  Widget build(BuildContext context) {
+    if (event == null) {
+      return Container();
+    }
+    return Row(
+      children: <Widget>[
+        Icon(
+          Icons.edit,
+          color: Theme.of(context).primaryColor,
+        ),
+        Container(width: 15.0),
+        Text(
+          event?.getLocalizedBody(
+                MatrixLocals(L10n.of(context)),
+                withSenderNamePrefix: false,
+                hideReply: true,
+              ) ??
+              '',
+          overflow: TextOverflow.ellipsis,
+          maxLines: 1,
+          style: TextStyle(
+            color: Theme.of(context).textTheme.bodyText2.color,
+          ),
+        ),
+      ],
+    );
+  }
+}