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hammer_gestures.ts
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hammer_gestures.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
*/
import {Inject, Injectable, InjectionToken, Optional, ɵConsole as Console} from '@angular/core';
import {DOCUMENT} from '../dom_tokens';
import {EventManagerPlugin} from './event_manager';
const EVENT_NAMES = {
// pan
'pan': true,
'panstart': true,
'panmove': true,
'panend': true,
'pancancel': true,
'panleft': true,
'panright': true,
'panup': true,
'pandown': true,
// pinch
'pinch': true,
'pinchstart': true,
'pinchmove': true,
'pinchend': true,
'pinchcancel': true,
'pinchin': true,
'pinchout': true,
// press
'press': true,
'pressup': true,
// rotate
'rotate': true,
'rotatestart': true,
'rotatemove': true,
'rotateend': true,
'rotatecancel': true,
// swipe
'swipe': true,
'swipeleft': true,
'swiperight': true,
'swipeup': true,
'swipedown': true,
// tap
'tap': true,
};
/**
* A DI token that you can use to provide{@link HammerGestureConfig} to Angular. Use it to configure
* Hammer gestures.
*
* @experimental
*/
export const HAMMER_GESTURE_CONFIG = new InjectionToken<HammerGestureConfig>('HammerGestureConfig');
/** Function that loads HammerJS, returning a promise that is resolved once HammerJs is loaded. */
export type HammerLoader = (() => Promise<void>) | null;
/** Injection token used to provide a {@link HammerLoader} to Angular. */
export const HAMMER_LOADER = new InjectionToken<HammerLoader>('HammerLoader');
export interface HammerInstance {
on(eventName: string, callback?: Function): void;
off(eventName: string, callback?: Function): void;
}
/**
* @experimental
*/
@Injectable()
export class HammerGestureConfig {
events: string[] = [];
overrides: {[key: string]: Object} = {};
options?: {
cssProps?: any; domEvents?: boolean; enable?: boolean | ((manager: any) => boolean);
preset?: any[];
touchAction?: string;
recognizers?: any[];
inputClass?: any;
inputTarget?: EventTarget;
};
buildHammer(element: HTMLElement): HammerInstance {
const mc = new Hammer(element, this.options);
mc.get('pinch').set({enable: true});
mc.get('rotate').set({enable: true});
for (const eventName in this.overrides) {
mc.get(eventName).set(this.overrides[eventName]);
}
return mc;
}
}
@Injectable()
export class HammerGesturesPlugin extends EventManagerPlugin {
constructor(
@Inject(DOCUMENT) doc: any,
@Inject(HAMMER_GESTURE_CONFIG) private _config: HammerGestureConfig, private console: Console,
@Optional() @Inject(HAMMER_LOADER) private loader?: HammerLoader) {
super(doc);
}
supports(eventName: string): boolean {
if (!EVENT_NAMES.hasOwnProperty(eventName.toLowerCase()) && !this.isCustomEvent(eventName)) {
return false;
}
if (!(window as any).Hammer && !this.loader) {
this.console.warn(
`The "${eventName}" event cannot be bound because Hammer.JS is not ` +
`loaded and no custom loader has been specified.`);
return false;
}
return true;
}
addEventListener(element: HTMLElement, eventName: string, handler: Function): Function {
const zone = this.manager.getZone();
eventName = eventName.toLowerCase();
// If Hammer is not present but a loader is specified, we defer adding the event listener
// until Hammer is loaded.
if (!(window as any).Hammer && this.loader) {
// This `addEventListener` method returns a function to remove the added listener.
// Until Hammer is loaded, the returned function needs to *cancel* the registration rather
// than remove anything.
let cancelRegistration = false;
let deregister: Function = () => { cancelRegistration = true; };
this.loader()
.then(() => {
// If Hammer isn't actually loaded when the custom loader resolves, give up.
if (!(window as any).Hammer) {
this.console.warn(
`The custom HAMMER_LOADER completed, but Hammer.JS is not present.`);
deregister = () => {};
return;
}
if (!cancelRegistration) {
// Now that Hammer is loaded and the listener is being loaded for real,
// the deregistration function changes from canceling registration to removal.
deregister = this.addEventListener(element, eventName, handler);
}
})
.catch(() => {
this.console.warn(
`The "${eventName}" event cannot be bound because the custom ` +
`Hammer.JS loader failed.`);
deregister = () => {};
});
// Return a function that *executes* `deregister` (and not `deregister` itself) so that we
// can change the behavior of `deregister` once the listener is added. Using a closure in
// this way allows us to avoid any additional data structures to track listener removal.
return () => { deregister(); };
}
return zone.runOutsideAngular(() => {
// Creating the manager bind events, must be done outside of angular
const mc = this._config.buildHammer(element);
const callback = function(eventObj: HammerInput) {
zone.runGuarded(function() { handler(eventObj); });
};
mc.on(eventName, callback);
return () => mc.off(eventName, callback);
});
}
isCustomEvent(eventName: string): boolean { return this._config.events.indexOf(eventName) > -1; }
}