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// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information
import PostViewController from './post_view_controller.jsx';
import ChannelStore from 'stores/channel_store.jsx';
import UserStore from 'stores/user_store.jsx';
import * as AsyncClient from 'utils/async_client.jsx';
import React from 'react';
const MAXIMUM_CACHED_VIEWS = 5;
export default class PostViewCache extends React.Component {
constructor(props) {
super(props);
this.onChannelChange = this.onChannelChange.bind(this);
const currentChannelId = ChannelStore.getCurrentId();
const channel = ChannelStore.getCurrent();
this.state = {
currentChannelId,
channels: channel ? [channel] : []
};
}
componentDidMount() {
ChannelStore.addChangeListener(this.onChannelChange);
}
componentWillUnmount() {
if (UserStore.getCurrentUser()) {
AsyncClient.viewChannel('', this.state.currentChannelId || '');
}
ChannelStore.removeChangeListener(this.onChannelChange);
}
onChannelChange() {
const channels = Object.assign([], this.state.channels);
const currentChannel = ChannelStore.getCurrent();
if (!currentChannel) {
return;
}
// make sure current channel really changed
if (currentChannel.id === this.state.currentChannelId) {
return;
}
if (channels.length > MAXIMUM_CACHED_VIEWS) {
channels.shift();
}
const index = channels.map((c) => c.id).indexOf(currentChannel.id);
if (index !== -1) {
channels.splice(index, 1);
}
channels.push(currentChannel);
this.setState({
currentChannelId: currentChannel.id,
channels
});
}
render() {
const channels = this.state.channels;
const currentChannelId = this.state.currentChannelId;
const postViews = [];
for (let i = 0; i < channels.length; i++) {
postViews.push(
<PostViewController
key={'postviewcontroller_' + channels[i].id}
channel={channels[i]}
active={channels[i].id === currentChannelId}
/>
);
}
return (
<div id='post-list'>
{postViews}
</div>
);
}
}
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