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import { Component } from 'react';
import SyncReaderFollows from 'calypso/components/data/sync-reader-follows';
import Main from 'calypso/components/main';
import { ReaderPendingActionHandler } from './pending-action-handler';
import './style.scss';
/*
* We ref-count number of ReaderMains on screen in order to avoid a race condition
*
* If two pages in a row have a ReaderMain there is no guarantee as to the order of dismounting
* and mounting. If we naively toggled the readerPage within willMount and willDismount
* we could run into a weird state.
*
* A problem sequence would be:
* 1. land on reader (mount, 1 ref)
* 2. navigate to another reader page (mount new ReaderMain, 2 ref)
* 3. dismount old ReaderMain from the first step (dismount, 1 ref)
*/
let activeReaderMainRefCount = 0;
const setIsReaderPage = ( add ) => {
if ( add ) {
document.querySelector( 'body' ).classList.add( 'is-reader-page' );
} else if ( activeReaderMainRefCount === 0 ) {
document.querySelector( 'body' ).classList.remove( 'is-reader-page' );
}
};
/**
* A specialization of `Main` that adds a class to the body of the document
*
* This class is used by pieces of the Reader to indicate they want "editorial" styles.
* Notably, this overrides the background color of the document and is used as a hook by other parts to override styles.
*/
export default class ReaderMain extends Component {
componentDidMount() {
activeReaderMainRefCount++;
setIsReaderPage( true );
}
componentWillUnmount() {
activeReaderMainRefCount--;
setIsReaderPage( false );
}
render() {
const { children, forwardRef, ...props } = this.props;
return (
<div ref={ forwardRef }>
<Main { ...props }>
<SyncReaderFollows key="syncReaderFollows" />
<ReaderPendingActionHandler />
{ children }
</Main>
</div>
);
}
}
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