react-native-navigationbar-obsever/index.js

Android-NvagationShowing-Listener

var NavigationbarObsever = require('react-native').NativeModules.NavigationbarObseverModule;
var DeviceEventEmitter = require('react-native').DeviceEventEmitter;

var listeners = {};
var navigationbarDidShowChange = 'navigationbarDidShowChange';

var id = 0;
var META = '__listener_id';

function getKey(listener) {
    if (!listener.hasOwnProperty(META)) {
        if (!Object.isExtensible(listener)) {
            return 'F';
        }

        Object.defineProperty(listener, META, {
            value: 'L' + ++id,
        });
    }

    return listener[META];
};

module.exports = {
    bindListener(cb) {
        NavigationbarObsever.bindListener((error, isOK) => {
            cb(error, isOK);
        });
    },

    unbindListener() {
        NavigationbarObsever.unbindListener();
    },

    getNavigationbarSize(cb) {
        NavigationbarObsever.getNavigationbarSize((error, size) => {
            cb(error, size);
        });
    },

    isNavigationbarShow(cb) {
        NavigationbarObsever.isNavigationbarShow((error, navigationbarShow) => {
            cb(error, navigationbarShow);
        });
    },

    isRomNavigationbarShow(cb) {
        NavigationbarObsever.isRomNavigationbarShow((error, romNavigationbarShow) => {
            cb(error, romNavigationbarShow);
        });
    },

    isRealNavigationbarShow(cb) {
        NavigationbarObsever.isRealNavigationbarShow((error, realNavigationbarShow) => {
            cb(error, realNavigationbarShow);
        });
    },

    addNavigationbarDidShowChangeListener(cb) {
        var key = getKey(cb);
        listeners[key] = DeviceEventEmitter.addListener(navigationbarDidShowChange,
            (body) => {
                cb(body.navigationbarShow);
            });
    },

    removeNavigationbarDidShowChangeListener(cb) {
        var key = getKey(cb);

        if (!listeners[key]) {
            return;
        }

        listeners[key].remove();
        listeners[key] = null;
    },
}