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syncUserSettings.js
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syncUserSettings.js
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/**
* @module changeListeners/syncUserSettings
* @private
*/
/**
* Creates an instance of the user settings sync change listener.
*
* This change listener syncs certain parts of the state tree to user
* settings when they change.
*
* Used for:
*
* * Enabled state: If the previews are enabled or disabled.
* * Preview count: When the user dwells on a link for long enough that
* a preview is shown, then their preview count will be incremented (see
* `reducers/eventLogging.js`, and is persisted to local storage.
*
* @param {ext.popups.UserSettings} userSettings
* @return {ext.popups.ChangeListener}
*/
export default function syncUserSettings( userSettings ) {
return ( oldState, newState ) => {
Object.keys( newState.preview.enabled ).forEach( ( key ) => {
syncIfChanged(
oldState, newState, `preview.enabled.${ key }`,
( value ) => {
userSettings.storePreviewTypeEnabled( key, value );
}
);
} );
};
}
/**
* Given a state tree, reducer and property, safely return the value of the
* property if the reducer and property exist
*
* @param {Object} state tree
* @param {string} path dot-separated path in the state tree
* @return {any}
*/
function get( state, path ) {
return path.split( '.' ).reduce(
( element, key ) => element && element[ key ],
state
);
}
/**
* Calls a sync function if the property prop on the property reducer on
* the state trees has changed value.
*
* @param {Object} oldState
* @param {Object} newState
* @param {string} path dot-separated path in the state tree
* @param {Function} sync function to be called with the newest value if
* changed
*/
function syncIfChanged( oldState, newState, path, sync ) {
const current = get( newState, path );
if ( oldState && ( get( oldState, path ) !== current ) ) {
sync( current );
}
}

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