From 7bb6c66b3409ad9608823112fe7970a8286716ea Mon Sep 17 00:00:00 2001
From: syuilo <syuilotan@yahoo.co.jp>
Date: Wed, 1 Nov 2017 13:25:09 +0900
Subject: [PATCH] :v:

---
 src/web/app/ch/tags/channel.tag | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/web/app/ch/tags/channel.tag b/src/web/app/ch/tags/channel.tag
index 4421a4b0ed..602b80bc11 100644
--- a/src/web/app/ch/tags/channel.tag
+++ b/src/web/app/ch/tags/channel.tag
@@ -44,6 +44,7 @@
 		this.posts = null;
 		this.connection = new ChannelStream(this.id);
 		this.version = VERSION;
+		this.unreadCount = 0;
 
 		this.on('mount', () => {
 			document.documentElement.style.background = '#efefef';
@@ -73,18 +74,31 @@
 			});
 
 			this.connection.on('post', this.onPost);
+			document.addEventListener('visibilitychange', this.onVisibilitychange, false);
 		});
 
 		this.on('unmount', () => {
 			this.connection.off('post', this.onPost);
 			this.connection.close();
+			document.removeEventListener('visibilitychange', this.onVisibilitychange);
 		});
 
 		this.onPost = post => {
 			this.posts.unshift(post);
 			this.update();
+
+			if (document.hidden && this.SIGNIN && post.user_id !== this.I.id) {
+				this.unreadCount++;
+				document.title = `(${this.unreadCount}) ${this.channel.title} | Misskey`;
+			}
 		};
 
+		this.onVisibilitychange = () => {
+			if (!document.hidden) {
+				this.unreadCount = 0;
+				document.title = this.channel.title + ' | Misskey'
+			}
+		};
 	</script>
 </mk-channel>