angular-docs-cn/packages/zone.js/lib/common/timers.ts

134 lines
4.6 KiB
TypeScript

/**
* @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
*/
/**
* @fileoverview
* @suppress {missingRequire}
*/
import {patchMethod, scheduleMacroTaskWithCurrentZone, zoneSymbol} from './utils';
const taskSymbol = zoneSymbol('zoneTask');
interface TimerOptions extends TaskData {
handleId?: number;
args: any[];
}
export function patchTimer(window: any, setName: string, cancelName: string, nameSuffix: string) {
let setNative: Function|null = null;
let clearNative: Function|null = null;
setName += nameSuffix;
cancelName += nameSuffix;
const tasksByHandleId: {[id: number]: Task} = {};
function scheduleTask(task: Task) {
const data = <TimerOptions>task.data;
function timer(this: unknown) {
try {
task.invoke.apply(this, arguments);
} finally {
// issue-934, task will be cancelled
// even it is a periodic task such as
// setInterval
if (!(task.data && task.data.isPeriodic)) {
if (typeof data.handleId === 'number') {
// in non-nodejs env, we remove timerId
// from local cache
delete tasksByHandleId[data.handleId];
} else if (data.handleId) {
// Node returns complex objects as handleIds
// we remove task reference from timer object
(data.handleId as any)[taskSymbol] = null;
}
}
}
}
data.args[0] = timer;
data.handleId = setNative !.apply(window, data.args);
return task;
}
function clearTask(task: Task) { return clearNative !((<TimerOptions>task.data).handleId); }
setNative =
patchMethod(window, setName, (delegate: Function) => function(self: any, args: any[]) {
if (typeof args[0] === 'function') {
const options: TimerOptions = {
isPeriodic: nameSuffix === 'Interval',
delay: (nameSuffix === 'Timeout' || nameSuffix === 'Interval') ? args[1] || 0 :
undefined,
args: args
};
const task =
scheduleMacroTaskWithCurrentZone(setName, args[0], options, scheduleTask, clearTask);
if (!task) {
return task;
}
// Node.js must additionally support the ref and unref functions.
const handle: any = (<TimerOptions>task.data).handleId;
if (typeof handle === 'number') {
// for non nodejs env, we save handleId: task
// mapping in local cache for clearTimeout
tasksByHandleId[handle] = task;
} else if (handle) {
// for nodejs env, we save task
// reference in timerId Object for clearTimeout
handle[taskSymbol] = task;
}
// check whether handle is null, because some polyfill or browser
// may return undefined from setTimeout/setInterval/setImmediate/requestAnimationFrame
if (handle && handle.ref && handle.unref && typeof handle.ref === 'function' &&
typeof handle.unref === 'function') {
(<any>task).ref = (<any>handle).ref.bind(handle);
(<any>task).unref = (<any>handle).unref.bind(handle);
}
if (typeof handle === 'number' || handle) {
return handle;
}
return task;
} else {
// cause an error by calling it directly.
return delegate.apply(window, args);
}
});
clearNative =
patchMethod(window, cancelName, (delegate: Function) => function(self: any, args: any[]) {
const id = args[0];
let task: Task;
if (typeof id === 'number') {
// non nodejs env.
task = tasksByHandleId[id];
} else {
// nodejs env.
task = id && id[taskSymbol];
// other environments.
if (!task) {
task = id;
}
}
if (task && typeof task.type === 'string') {
if (task.state !== 'notScheduled' &&
(task.cancelFn && task.data !.isPeriodic || task.runCount === 0)) {
if (typeof id === 'number') {
delete tasksByHandleId[id];
} else if (id) {
id[taskSymbol] = null;
}
// Do not cancel already canceled functions
task.zone.cancelTask(task);
}
} else {
// cause an error by calling it directly.
delegate.apply(window, args);
}
});
}