angular-cn/packages/zone.js/lib/browser/webapis-resize-observer.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('ResizeObserver', (global: any, Zone: any, api: _ZonePrivate) => {
const ResizeObserver = global['ResizeObserver'];
if (!ResizeObserver) {
return;
}
const resizeObserverSymbol = api.symbol('ResizeObserver');
api.patchMethod(global, 'ResizeObserver', (delegate: Function) => (self: any, args: any[]) => {
const callback = args.length > 0 ? args[0] : null;
if (callback) {
args[0] = function(entries: any, observer: any) {
const zones: {[zoneName: string]: any} = {};
const currZone = Zone.current;
for (let entry of entries) {
let zone = entry.target[resizeObserverSymbol];
if (!zone) {
zone = currZone;
}
let zoneEntriesInfo = zones[zone.name];
if (!zoneEntriesInfo) {
zones[zone.name] = zoneEntriesInfo = {entries: [], zone: zone};
}
zoneEntriesInfo.entries.push(entry);
}
Object.keys(zones).forEach(zoneName => {
const zoneEntriesInfo = zones[zoneName];
if (zoneEntriesInfo.zone !== Zone.current) {
zoneEntriesInfo.zone.run(
callback, this, [zoneEntriesInfo.entries, observer], 'ResizeObserver');
} else {
callback.call(this, zoneEntriesInfo.entries, observer);
}
});
};
}
return args.length > 0 ? new ResizeObserver(args[0]) : new ResizeObserver();
});
api.patchMethod(
ResizeObserver.prototype, 'observe', (delegate: Function) => (self: any, args: any[]) => {
const target = args.length > 0 ? args[0] : null;
if (!target) {
return delegate.apply(self, args);
}
let targets = self[resizeObserverSymbol];
if (!targets) {
targets = self[resizeObserverSymbol] = [];
}
targets.push(target);
target[resizeObserverSymbol] = Zone.current;
return delegate.apply(self, args);
});
api.patchMethod(
ResizeObserver.prototype, 'unobserve', (delegate: Function) => (self: any, args: any[]) => {
const target = args.length > 0 ? args[0] : null;
if (!target) {
return delegate.apply(self, args);
}
let targets = self[resizeObserverSymbol];
if (targets) {
for (let i = 0; i < targets.length; i++) {
if (targets[i] === target) {
targets.splice(i, 1);
break;
}
}
}
target[resizeObserverSymbol] = undefined;
return delegate.apply(self, args);
});
api.patchMethod(
ResizeObserver.prototype, 'disconnect', (delegate: Function) => (self: any, args: any[]) => {
const targets = self[resizeObserverSymbol];
if (targets) {
targets.forEach((target: any) => {
target[resizeObserverSymbol] = undefined;
});
self[resizeObserverSymbol] = undefined;
}
return delegate.apply(self, args);
});
});