feat: support lazy-loading HammerJS w/ Angular 6.1 (#11960)

Angular 6.1 adds the HAMMER_LOADER token that can be used to lazy-load HammerJS. This commit updates Angular Material's gesture config to be compatible with lazy-loading HammerJS by: * Only reading `window.Hammer` after Angular knows that HammerJS has been loaded. * Always registering the set of gesture events used in the Angular Material components (instead of registering no events when Hammer is absent). Once we are able to depend on HAMMER_LOADER itself (in v7.0), this can be simplified a bit.
2026-09-14 13:54:52 +08:00 · 2018-07-10 07:25:51 -07:00
parent e1fd13aec5
commit eed6110b86
3 changed files with 139 additions and 93 deletions
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          "requires": {
@@ -8421,13 +8421,13 @@
        },
        "stringstream": {
          "version": "0.0.5",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/stringstream/-/stringstream-0.0.5.tgz",
          "integrity": "sha1-TkhM1N5aC7vuGORjB3EKioFiGHg=",
          "dev": true
        },
        "strip-ansi": {
          "version": "3.0.1",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
          "dev": true,
          "requires": {
@@ -8436,13 +8436,13 @@
        },
        "strip-json-comments": {
          "version": "2.0.1",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
          "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
          "dev": true
        },
        "tar": {
          "version": "2.2.1",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/tar/-/tar-2.2.1.tgz",
          "integrity": "sha1-jk0qJWwOIYXGsYrWlK7JaLg8sdE=",
          "dev": true,
          "requires": {
@@ -8453,7 +8453,7 @@
        },
        "tar-pack": {
          "version": "3.4.1",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/tar-pack/-/tar-pack-3.4.1.tgz",
          "integrity": "sha512-PPRybI9+jM5tjtCbN2cxmmRU7YmqT3Zv/UDy48tAh2XRkLa9bAORtSWLkVc13+GJF+cdTh1yEnHEk3cpTaL5Kg==",
          "dev": true,
          "requires": {
@@ -8478,7 +8478,7 @@
        },
        "tunnel-agent": {
          "version": "0.6.0",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
          "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
          "dev": true,
          "requires": {
@@ -8487,20 +8487,20 @@
        },
        "tweetnacl": {
          "version": "0.14.5",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
          "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
          "dev": true,
          "optional": true
        },
        "uid-number": {
          "version": "0.0.6",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/uid-number/-/uid-number-0.0.6.tgz",
          "integrity": "sha1-DqEOgDXo61uOREnwbaHHMGY7qoE=",
          "dev": true
        },
        "util-deprecate": {
          "version": "1.0.2",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
          "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
          "dev": true
        },
@@ -8512,7 +8512,7 @@
        },
        "verror": {
          "version": "1.10.0",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
          "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
          "dev": true,
          "requires": {
@@ -8523,7 +8523,7 @@
        },
        "wide-align": {
          "version": "1.1.2",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.2.tgz",
          "integrity": "sha512-ijDLlyQ7s6x1JgCLur53osjm/UXUYD9+0PbYKrBsYisYXzCxN+HC3mYDNy/dWdmf3AwqwU3CXwDCvsNgGK1S0w==",
          "dev": true,
          "requires": {
@@ -8532,7 +8532,7 @@
        },
        "wrappy": {
          "version": "1.0.2",
-          "resolved": false,
+          "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
          "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
          "dev": true
        }
@@ -6,7 +6,7 @@ import {GestureConfig, MAT_HAMMER_OPTIONS} from './gesture-config';
 describe('GestureConfig', () => {
  beforeEach(async(() => {
    TestBed.configureTestingModule({
-      declarations: [TestApp],
+      declarations: [ButtonWithLongpressHander],
      providers: [{provide: HAMMER_GESTURE_CONFIG, useClass: GestureConfig}]
    }).compileComponents();
  }));
@@ -14,7 +14,7 @@ describe('GestureConfig', () => {
  it('should instantiate HammerJS', () => {
    spyOn(window, 'Hammer' as any).and.callThrough();

-    const fixture = TestBed.createComponent(TestApp);
+    const fixture = TestBed.createComponent(ButtonWithLongpressHander);
    fixture.detectChanges();

    expect(window['Hammer']).toHaveBeenCalled();
@@ -24,7 +24,7 @@ describe('GestureConfig', () => {
    TestBed
      .resetTestingModule()
      .configureTestingModule({
-        declarations: [TestApp],
+        declarations: [ButtonWithLongpressHander],
        providers: [
          {provide: HAMMER_GESTURE_CONFIG, useClass: GestureConfig},
          {provide: MAT_HAMMER_OPTIONS, useValue: {cssProps: {touchAction: 'auto'}}}
@@ -34,7 +34,7 @@ describe('GestureConfig', () => {

    spyOn(window, 'Hammer' as any).and.callThrough();

-    const fixture = TestBed.createComponent(TestApp);
+    const fixture = TestBed.createComponent(ButtonWithLongpressHander);
    fixture.detectChanges();

    const button = fixture.debugElement.nativeElement.querySelector('button');
@@ -44,12 +44,35 @@ describe('GestureConfig', () => {
    expect(firstCallArgs[1].cssProps.touchAction).toBe('auto');
  });

+  it('should should not error when HammerJS is not loaded', () => {
+    // Remove the Hammer global from the environment, storing it to restore at the end of the test.
+    const hammerGlobal = (window as any).Hammer;
+    (window as any).Hammer = undefined;
+
+    TestBed
+      .resetTestingModule()
+      .configureTestingModule({
+        declarations: [ButtonWithLongpressHander],
+        providers: [{provide: HAMMER_GESTURE_CONFIG, useClass: GestureConfig}],
+      }).compileComponents();
+
+    const fixture = TestBed.createComponent(ButtonWithLongpressHander);
+    fixture.detectChanges();
+
+    // No assertions here; the absense of errors satisfies this test.
+
+    // Restore the global Hammer.
+    (window as any).Hammer = hammerGlobal;
+  });
+
+  // TODO(jelbourn): add a test for use of HAMMER_LOADER when we can depend on Angular 6.1+.
+
 });


@Component({
  template: `<button (longpress)="noop()">Long press me</button>`
 })
-class TestApp {
+class ButtonWithLongpressHander {
  noop() {}
 }
@@ -23,20 +23,29 @@ import {
 */
 export const MAT_HAMMER_OPTIONS = new InjectionToken<HammerOptions>('MAT_HAMMER_OPTIONS');

+const ANGULAR_MATERIAL_SUPPORTED_HAMMER_GESTURES = [
+  'longpress',
+  'slide',
+  'slidestart',
+  'slideend',
+  'slideright',
+  'slideleft'
+];
+
+/**
+ * Fake HammerInstance that is used when a Hammer instance is requested when HammerJS has not
+ * been loaded on the page.
+ */
+const noopHammerInstance: HammerInstance = {
+  on: () => {},
+  off: () => {},
+};
+
 /** Adjusts configuration of our gesture library, Hammer. */
@Injectable()
 export class GestureConfig extends HammerGestureConfig {
-  private _hammer: HammerStatic = typeof window !== 'undefined' ? (window as any).Hammer : null;
-
  /** List of new event names to add to the gesture support list */
-  events: string[] = this._hammer ? [
-    'longpress',
-    'slide',
-    'slidestart',
-    'slideend',
-    'slideright',
-    'slideleft'
-  ] : [];
+  events = ANGULAR_MATERIAL_SUPPORTED_HAMMER_GESTURES;

  constructor(
    @Optional() @Inject(MAT_HAMMER_OPTIONS) private _hammerOptions?: HammerOptions,
@@ -61,12 +70,26 @@ export class GestureConfig extends HammerGestureConfig {
   * @returns Newly-created HammerJS instance.
   */
  buildHammer(element: HTMLElement): HammerInstance {
-    const mc = new this._hammer(element, this._hammerOptions || undefined);
+    const hammer: HammerStatic = typeof window !== 'undefined' ? (window as any).Hammer : null;
+
+    if (!hammer) {
+      // If HammerJS is not loaded here, return the noop HammerInstance. This is necessary to
+      // ensure that omitting HammerJS completely will not cause any errors while *also* supporting
+      // the lazy-loading of HammerJS via the HAMMER_LOADER token introduced in Angular 6.1.
+      // Because we can't depend on HAMMER_LOADER's existance until 7.0, we have to always set
+      // `this.events` to the set we support, instead of conditionally setting it to `[]` if
+      // `HAMMER_LOADER` is present (and then throwing an Error here if `window.Hammer` is
+      // undefined).
+      // @deletion-target 7.0.0
+      return noopHammerInstance;
+    }
+
+    const mc = new hammer(element, this._hammerOptions || undefined);

    // Default Hammer Recognizers.
-    const pan = new this._hammer.Pan();
-    const swipe = new this._hammer.Swipe();
-    const press = new this._hammer.Press();
+    const pan = new hammer.Pan();
+    const swipe = new hammer.Swipe();
+    const press = new hammer.Press();

    // Notice that a HammerJS recognizer can only depend on one other recognizer once.
    // Otherwise the previous `recognizeWith` will be dropped.