Add post list container to hold mounted post lists for faster rendering/channel switching.

web/react/components/post_list_container.jsx

@@ -0,0 +1,62 @@
+// Copyright (c) 2015 Spinpunch, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+const PostList = require('./post_list.jsx');
+const ChannelStore = require('../stores/channel_store.jsx');
+
+export default class PostListContainer extends React.Component {
+    constructor() {
+        super();
+
+        this.onChange = this.onChange.bind(this);
+        this.onLeave = this.onLeave.bind(this);
+
+        let currentChannelId = ChannelStore.getCurrentId();
+        if (currentChannelId) {
+            this.state = {currentChannelId: currentChannelId, postLists: [currentChannelId]};
+        } else {
+            this.state = {currentChannelId: null, postLists: []};
+        }
+    }
+    componentDidMount() {
+        ChannelStore.addChangeListener(this.onChange);
+        ChannelStore.addLeaveListener(this.onLeave);
+    }
+    onChange() {
+        let channelId = ChannelStore.getCurrentId();
+        if (channelId === this.state.currentChannelId) {
+            return;
+        }
+
+        let postLists = this.state.postLists;
+        if (postLists.indexOf(channelId) === -1) {
+            postLists.push(channelId);
+        }
+        this.setState({currentChannelId: channelId, postLists: postLists});
+    }
+    onLeave(id) {
+        let postLists = this.state.postLists;
+        var index = postLists.indexOf(id);
+        if (index !== -1) {
+            postLists.splice(index, 1);
+        }
+    }
+    render() {
+        let postLists = this.state.postLists;
+        let channelId = this.state.currentChannelId;
+
+        let postListCtls = [];
+        for (let i = 0; i <= this.state.postLists.length - 1; i++) {
+            postListCtls.push(
+                <PostList
+                    channelId={postLists[i]}
+                    isActive={postLists[i] === channelId}
+                />
+            );
+        }
+
+        return (
+            <div>{postListCtls}</div>
+        );
+    }
+}