From 7daf412b7db1f1e4e501be9ceb5577faf6e01d2a Mon Sep 17 00:00:00 2001
From: Salvatore Giordano <salvatoregiordanoo@gmail.com>
Date: Fri, 28 Feb 2020 14:16:01 +0100
Subject: [PATCH] add threadheader

---
 example/lib/custom_theme.dart |  3 ++
 example/lib/threads.dart      |  3 ++
 lib/src/thread_header.dart    | 87 +++++++++++++++++++++++++++++++++++
 lib/stream_chat_flutter.dart  |  1 +
 4 files changed, 94 insertions(+)
 create mode 100644 lib/src/thread_header.dart

diff --git a/example/lib/custom_theme.dart b/example/lib/custom_theme.dart
index 26b66584..0f2a57d1 100644
--- a/example/lib/custom_theme.dart
+++ b/example/lib/custom_theme.dart
@@ -104,6 +104,9 @@ class ThreadPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
+      appBar: ThreadHeader(
+        parent: parent,
+      ),
       body: Column(
         children: <Widget>[
           Expanded(
diff --git a/example/lib/threads.dart b/example/lib/threads.dart
index 20481baf..20f67f63 100644
--- a/example/lib/threads.dart
+++ b/example/lib/threads.dart
@@ -88,6 +88,9 @@ class ThreadPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
+      appBar: ThreadHeader(
+        parent: parent,
+      ),
       body: Column(
         children: <Widget>[
           Expanded(
diff --git a/lib/src/thread_header.dart b/lib/src/thread_header.dart
new file mode 100644
index 00000000..3421fa0a
--- /dev/null
+++ b/lib/src/thread_header.dart
@@ -0,0 +1,87 @@
+import 'package:flutter/material.dart';
+import 'package:stream_chat/stream_chat.dart';
+import 'package:stream_chat_flutter/src/stream_chat_theme.dart';
+
+import 'stream_channel.dart';
+
+class ThreadHeader extends StatelessWidget implements PreferredSizeWidget {
+  final bool showBackButton;
+  final VoidCallback onBackPressed;
+  final Message parent;
+
+  ThreadHeader({
+    Key key,
+    @required this.parent,
+    this.showBackButton = true,
+    this.onBackPressed,
+  })  : preferredSize = Size.fromHeight(kToolbarHeight),
+        super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    final channel = StreamChannel.of(context).channel;
+    return AppBar(
+      automaticallyImplyLeading: false,
+      elevation: 1,
+      backgroundColor:
+          StreamChatTheme.of(context).channelTheme.channelHeaderTheme.color,
+      actions: <Widget>[
+        Container(
+          child: showBackButton ? _buildBackButton(context) : Container(),
+        ),
+      ],
+      centerTitle: false,
+      title: Text.rich(
+        TextSpan(
+          text: 'Thread',
+          children: [
+            TextSpan(
+              text:
+                  '   ${parent.replyCount} ${parent.replyCount == 1 ? 'reply' : 'replies'}',
+              style: StreamChatTheme.of(context)
+                  .channelTheme
+                  .channelHeaderTheme
+                  .lastMessageAt,
+            ),
+          ],
+        ),
+        style:
+            StreamChatTheme.of(context).channelTheme.channelHeaderTheme.title,
+      ),
+    );
+  }
+
+  Padding _buildBackButton(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.all(14.0),
+      child: AspectRatio(
+        aspectRatio: 1,
+        child: RawMaterialButton(
+          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(4)),
+          elevation: 0,
+          highlightElevation: 0,
+          focusElevation: 0,
+          disabledElevation: 0,
+          hoverElevation: 0,
+          onPressed: () {
+            if (onBackPressed != null) {
+              onBackPressed();
+            } else {
+              Navigator.of(context).pop();
+            }
+          },
+          fillColor: Colors.black.withOpacity(.1),
+          padding: EdgeInsets.all(4),
+          child: Icon(
+            Icons.close,
+            size: 15,
+            color: Colors.black,
+          ),
+        ),
+      ),
+    );
+  }
+
+  @override
+  final Size preferredSize;
+}
diff --git a/lib/stream_chat_flutter.dart b/lib/stream_chat_flutter.dart
index 1f164781..3c41b7f0 100644
--- a/lib/stream_chat_flutter.dart
+++ b/lib/stream_chat_flutter.dart
@@ -11,3 +11,4 @@ export 'src/message_widget.dart';
 export 'src/stream_channel.dart';
 export 'src/stream_chat.dart';
 export 'src/stream_chat_theme.dart';
+export 'src/thread_header.dart';