react-native/Libraries/Alert/Alert.js

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule Alert
 * @flow
 */
'use strict';

const AlertIOS = require('AlertIOS');
const NativeModules = require('NativeModules');
const Platform = require('Platform');

import type { AlertType, AlertButtonStyle } from 'AlertIOS';

export type Buttons = Array<{
  text?: string,
  onPress?: ?Function,
  style?: AlertButtonStyle,
}>;

type Options = {
  cancelable?: ?boolean,
  onDismiss?: ?Function,
};

/**
 * Launches an alert dialog with the specified title and message.
 * 
 * See http://facebook.github.io/react-native/docs/alert.html
 */
class Alert {

  /**
   * Launches an alert dialog with the specified title and message.
   * 
   * See http://facebook.github.io/react-native/docs/alert.html#alert
   */
  static alert(
    title: ?string,
    message?: ?string,
    buttons?: Buttons,
    options?: Options,
    type?: AlertType,
  ): void {
    if (Platform.OS === 'ios') {
      if (typeof type !== 'undefined') {
        console.warn('Alert.alert() with a 5th "type" parameter is deprecated and will be removed. Use AlertIOS.prompt() instead.');
        AlertIOS.alert(title, message, buttons, type);
        return;
      }
      AlertIOS.alert(title, message, buttons);
    } else if (Platform.OS === 'android') {
      AlertAndroid.alert(title, message, buttons, options);
    }
  }
}

/**
 * Wrapper around the Android native module.
 */
class AlertAndroid {

  static alert(
    title: ?string,
    message?: ?string,
    buttons?: Buttons,
    options?: Options,
  ): void {
    var config = {
      title: title || '',
      message: message || '',
    };

    if (options) {
      config = {...config, cancelable: options.cancelable};
    }
    // At most three buttons (neutral, negative, positive). Ignore rest.
    // The text 'OK' should be probably localized. iOS Alert does that in native.
    var validButtons: Buttons = buttons ? buttons.slice(0, 3) : [{text: 'OK'}];
    var buttonPositive = validButtons.pop();
    var buttonNegative = validButtons.pop();
    var buttonNeutral = validButtons.pop();
    if (buttonNeutral) {
      config = {...config, buttonNeutral: buttonNeutral.text || '' };
    }
    if (buttonNegative) {
      config = {...config, buttonNegative: buttonNegative.text || '' };
    }
    if (buttonPositive) {
      config = {...config, buttonPositive: buttonPositive.text || '' };
    }
    NativeModules.DialogManagerAndroid.showAlert(
      config,
      (errorMessage) => console.warn(errorMessage),
      (action, buttonKey) => {
        if (action === NativeModules.DialogManagerAndroid.buttonClicked) {
          if (buttonKey === NativeModules.DialogManagerAndroid.buttonNeutral) {
            buttonNeutral.onPress && buttonNeutral.onPress();
          } else if (buttonKey === NativeModules.DialogManagerAndroid.buttonNegative) {
            buttonNegative.onPress && buttonNegative.onPress();
          } else if (buttonKey === NativeModules.DialogManagerAndroid.buttonPositive) {
            buttonPositive.onPress && buttonPositive.onPress();
          }
        } else if (action === NativeModules.DialogManagerAndroid.dismissed) {
          options && options.onDismiss && options.onDismiss();
        }
      }
    );
  }
}

module.exports = Alert;