trc-client-core/src/settings/SettingsReducer.js

The core of the TRC Client

import {
    SETTINGS_TOGGLE_FULLSCREEN,
    SETTINGS_SET_FULLSCREEN
} from 'trc-client-core/src/constants/ActionTypes';
import {fromJS} from 'immutable';

const initialState = fromJS({
    fullscreen: {}
});
export default function settings(state = initialState, action) {
    switch (action.type) {
        case SETTINGS_TOGGLE_FULLSCREEN:
            var statePath = ['fullscreen', action.payload];
            return state.setIn(statePath, !state.getIn(statePath));

        case SETTINGS_SET_FULLSCREEN:
            var statePath = ['fullscreen', action.payload.pathname];
            return state.setIn(statePath, action.payload.value);

        default: 
            return state;
    }
}