70 lines
1.4 KiB
JavaScript
70 lines
1.4 KiB
JavaScript
// @flow
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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 { clientResized } 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 window dimension changes.
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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 = () => {
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const {
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innerHeight,
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innerWidth
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} = window;
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store.dispatch(clientResized(innerWidth, innerHeight));
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};
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window.addEventListener('resize', 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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window.removeEventListener('resize', handler);
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handler = undefined;
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}
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