84 lines
1.8 KiB
JavaScript
84 lines
1.8 KiB
JavaScript
// @flow
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import { Dimensions } from 'react-native';
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import { APP_WILL_MOUNT, APP_WILL_UNMOUNT } from '../../base/app';
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import { MiddlewareRegistry } from '../../base/redux';
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import { setAspectRatio, setReducedUI } from './actions';
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/**
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* Dimensions change handler.
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*/
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let handler;
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/**
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* Middleware that handles widnow dimension changes and updates the aspect ratio and
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* reduced UI modes accordingly.
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*
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* @param {Store} store - The redux store.
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* @returns {Function}
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*/
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MiddlewareRegistry.register(store => next => action => {
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const result = next(action);
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switch (action.type) {
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case APP_WILL_UNMOUNT: {
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_appWillUnmount();
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break;
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}
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case APP_WILL_MOUNT:
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_appWillMount(store);
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break;
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}
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return result;
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});
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/**
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* Notifies this feature that the action {@link APP_WILL_MOUNT} is being
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* dispatched within a specific redux {@code store}.
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*
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* @param {Store} store - The redux store in which the specified {@code action}
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* is being dispatched.
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* @private
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* @returns {void}
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*/
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function _appWillMount(store) {
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handler = dim => {
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_onDimensionsChange(dim, store);
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};
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Dimensions.addEventListener('change', handler);
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}
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/**
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* Notifies this feature that the action {@link APP_WILL_UNMOUNT} is being
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* dispatched within a specific redux {@code store}.
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*
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* @private
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* @returns {void}
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*/
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function _appWillUnmount() {
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Dimensions.removeEventListener('change', handler);
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handler = undefined;
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}
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/**
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* Handles window dimension changes.
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*
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* @param {Object} dimensions - The new dimensions.
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* @param {Store} store - The redux store.
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* @private
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* @returns {void}
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*/
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function _onDimensionsChange(dimensions, store) {
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const { width, height } = dimensions.window;
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const { dispatch } = store;
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dispatch(setAspectRatio(width, height));
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dispatch(setReducedUI(width, height));
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}
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