react-native/RNTester/js/RNTesterNavigationReducer.js

56 lines
1.3 KiB
JavaScript

/**
* Copyright (c) 2015-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
* @providesModule RNTesterNavigationReducer
*/
'use strict';
// $FlowFixMe : This is a platform-forked component, and flow seems to only run on iOS?
const RNTesterList = require('./RNTesterList');
export type RNTesterNavigationState = {
openExample: ?string,
};
function RNTesterNavigationReducer(
state: ?RNTesterNavigationState,
action: any
): RNTesterNavigationState {
if (
// Default value is to see example list
!state ||
// Handle the explicit list action
action.type === 'RNTesterListAction' ||
// Handle requests to go back to the list when an example is open
(state.openExample && action.type === 'RNTesterBackAction')
) {
return {
// A null openExample will cause the views to display the RNTester example list
openExample: null,
};
}
if (action.type === 'RNTesterExampleAction') {
// Make sure we see the module before returning the new state
const ExampleModule = RNTesterList.Modules[action.openExample];
if (ExampleModule) {
return {
openExample: action.openExample,
};
}
}
return state;
}
module.exports = RNTesterNavigationReducer;