angular-cn/packages/zone.js/lib/browser/webapis-media-query.ts

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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
Zone.__load_patch('mediaQuery', (global: any, Zone: ZoneType, api: _ZonePrivate) => {
function patchAddListener(proto: any) {
api.patchMethod(proto, 'addListener', (delegate: Function) => (self: any, args: any[]) => {
const callback = args.length > 0 ? args[0] : null;
if (typeof callback === 'function') {
const wrapperedCallback = Zone.current.wrap(callback, 'MediaQuery');
callback[api.symbol('mediaQueryCallback')] = wrapperedCallback;
return delegate.call(self, wrapperedCallback);
} else {
return delegate.apply(self, args);
}
});
}
function patchRemoveListener(proto: any) {
api.patchMethod(proto, 'removeListener', (delegate: Function) => (self: any, args: any[]) => {
const callback = args.length > 0 ? args[0] : null;
if (typeof callback === 'function') {
const wrapperedCallback = callback[api.symbol('mediaQueryCallback')];
if (wrapperedCallback) {
return delegate.call(self, wrapperedCallback);
} else {
return delegate.apply(self, args);
}
} else {
return delegate.apply(self, args);
}
});
}
if (global['MediaQueryList']) {
const proto = global['MediaQueryList'].prototype;
patchAddListener(proto);
patchRemoveListener(proto);
} else if (global['matchMedia']) {
api.patchMethod(global, 'matchMedia', (delegate: Function) => (self: any, args: any[]) => {
const mql = delegate.apply(self, args);
if (mql) {
// try to patch MediaQueryList.prototype
const proto = Object.getPrototypeOf(mql);
if (proto && proto['addListener']) {
// try to patch proto, don't need to worry about patch
// multiple times, because, api.patchEventTarget will check it
patchAddListener(proto);
patchRemoveListener(proto);
patchAddListener(mql);
patchRemoveListener(mql);
} else if (mql['addListener']) {
// proto not exists, or proto has no addListener method
// try to patch mql instance
patchAddListener(mql);
patchRemoveListener(mql);
}
}
return mql;
});
}
});