feat(cdk/testing): support right clicking on a TestElement

Adds the ability to right click somewhere within a `TestElement`.

Fixes #20385.

Author: crisbeto

src/cdk/testing/protractor/protractor-element.ts

@@ -14,7 +14,7 @@ import {
   TestKey,
   TextOptions
 } from '@angular/cdk/testing';
-import {browser, by, ElementFinder, Key} from 'protractor';
+import {browser, Button, by, ElementFinder, Key} from 'protractor';
 
 /** Maps the `TestKey` constants to Protractor's `Key` constants. */
 const keyMap = {
@@ -81,15 +81,11 @@ export class ProtractorElement implements TestElement {
   }
 
   async click(...args: [] | ['center'] | [number, number]): Promise<void> {
-    // Omitting the offset argument to mouseMove results in clicking the center.
-    // This is the default behavior we want, so we use an empty array of offsetArgs if no args are
-    // passed to this method.
-    const offsetArgs = args.length === 2 ? [{x: args[0], y: args[1]}] : [];
+    await this._dispatchClickEventSequence(args);
+  }
 
-    await browser.actions()
-      .mouseMove(await this.element.getWebElement(), ...offsetArgs)
-      .click()
-      .perform();
+  async rightClick(...args: [] | ['center'] | [number, number]): Promise<void> {
+    await this._dispatchClickEventSequence(args, Button.RIGHT);
   }
 
   async focus(): Promise<void> {
@@ -198,4 +194,19 @@ export class ProtractorElement implements TestElement {
   async isFocused(): Promise<boolean> {
     return this.element.equals(browser.driver.switchTo().activeElement());
   }
+
+  /** Dispatches all the events that are part of a click event sequence. */
+  private async _dispatchClickEventSequence(
+    args: [] | ['center'] | [number, number],
+    button?: string) {
+    // Omitting the offset argument to mouseMove results in clicking the center.
+    // This is the default behavior we want, so we use an empty array of offsetArgs if no args are
+    // passed to this method.
+    const offsetArgs = args.length === 2 ? [{x: args[0], y: args[1]}] : [];
+
+    await browser.actions()
+      .mouseMove(await this.element.getWebElement(), ...offsetArgs)
+      .click(button)
+      .perform();
+  }
 }

src/cdk/testing/test-element.ts

@@ -84,6 +84,14 @@ export interface TestElement {
    */
   click(relativeX: number, relativeY: number): Promise<void>;
 
+  /**
+   * Right clicks on the element at the specified coordinates relative to the top-left of it.
+   * @param relativeX Coordinate within the element, along the X-axis at which to click.
+   * @param relativeY Coordinate within the element, along the Y-axis at which to click.
+   * @breaking-change 11.0.0 To become a required method.
+   */
+  rightClick?(relativeX: number, relativeY: number): Promise<void>;
+
   /** Focus the element. */
   focus(): Promise<void>;
 

src/cdk/testing/testbed/fake-events/dispatch-events.ts

@@ -47,8 +47,9 @@ export function dispatchKeyboardEvent(node: Node, type: string, keyCode?: number
  * Shorthand to dispatch a mouse event on the specified coordinates.
  * @docs-private
  */
-export function dispatchMouseEvent(node: Node, type: string, clientX = 0, clientY = 0): MouseEvent {
-  return dispatchEvent(node, createMouseEvent(type, clientX, clientY));
+export function dispatchMouseEvent(
+  node: Node, type: string, clientX = 0, clientY = 0, button?: number): MouseEvent {
+  return dispatchEvent(node, createMouseEvent(type, clientX, clientY, button));
 }
 
 /**

src/cdk/testing/testbed/unit-test-element.ts

@@ -78,24 +78,12 @@ export class UnitTestElement implements TestElement {
   }
 
   async click(...args: [] | ['center'] | [number, number]): Promise<void> {
-    let clientX: number | undefined = undefined;
-    let clientY: number | undefined = undefined;
-    if (args.length) {
-      const {left, top, width, height} = await this.getDimensions();
-      const relativeX = args[0] === 'center' ? width / 2 : args[0];
-      const relativeY = args[0] === 'center' ? height / 2 : args[1];
-
-      // Round the computed click position as decimal pixels are not
-      // supported by mouse events and could lead to unexpected results.
-      clientX = Math.round(left + relativeX);
-      clientY = Math.round(top + relativeY);
-    }
+    await this._dispatchMouseEventSequence('click', args);
+    await this._stabilize();
+  }
 
-    this._dispatchPointerEventIfSupported('pointerdown', clientX, clientY);
-    dispatchMouseEvent(this.element, 'mousedown', clientX, clientY);
-    this._dispatchPointerEventIfSupported('pointerup', clientX, clientY);
-    dispatchMouseEvent(this.element, 'mouseup', clientX, clientY);
-    dispatchMouseEvent(this.element, 'click', clientX, clientY);
+  async rightClick(...args: [] | ['center'] | [number, number]): Promise<void> {
+    await this._dispatchMouseEventSequence('contextmenu', args, 2);
     await this._stabilize();
   }
 
@@ -205,14 +193,43 @@ export class UnitTestElement implements TestElement {
    * @param name Name of the pointer event to be dispatched.
    * @param clientX Coordinate of the user's pointer along the X axis.
    * @param clientY Coordinate of the user's pointer along the Y axis.
+   * @param button Mouse button that should be pressed when dispatching the event.
    */
-  private _dispatchPointerEventIfSupported(name: string, clientX?: number, clientY?: number) {
+  private _dispatchPointerEventIfSupported(
+    name: string, clientX?: number, clientY?: number, button?: number) {
     // The latest versions of all browsers we support have the new `PointerEvent` API.
     // Though since we capture the two most recent versions of these browsers, we also
     // need to support Safari 12 at time of writing. Safari 12 does not have support for this,
     // so we need to conditionally create and dispatch these events based on feature detection.
     if (typeof PointerEvent !== 'undefined' && PointerEvent) {
-      dispatchPointerEvent(this.element, name, clientX, clientY);
+      dispatchPointerEvent(this.element, name, clientX, clientY, {isPrimary: true, button});
     }
   }
+
+  /** Dispatches all the events that are part of a mouse event sequence. */
+  private async _dispatchMouseEventSequence(
+    name: string,
+    args: [] | ['center'] | [number, number],
+    button?: number) {
+    let clientX: number | undefined = undefined;
+    let clientY: number | undefined = undefined;
+
+    if (args.length) {
+      const {left, top, width, height} = await this.getDimensions();
+      const relativeX = args[0] === 'center' ? width / 2 : args[0];
+      const relativeY = args[0] === 'center' ? height / 2 : args[1];
+
+      // Round the computed click position as decimal pixels are not
+      // supported by mouse events and could lead to unexpected results.
+      clientX = Math.round(left + relativeX);
+      clientY = Math.round(top + relativeY);
+    }
+
+    this._dispatchPointerEventIfSupported('pointerdown', clientX, clientY, button);
+    dispatchMouseEvent(this.element, 'mousedown', clientX, clientY, button);
+    this._dispatchPointerEventIfSupported('pointerup', clientX, clientY, button);
+    dispatchMouseEvent(this.element, 'mouseup', clientX, clientY, button);
+    dispatchMouseEvent(this.element, name, clientX, clientY, button);
+    await this._stabilize();
+  }
 }

src/cdk/testing/tests/cross-environment.spec.ts

@@ -333,6 +333,13 @@ export function crossEnvironmentSpecs(
       expect(await clickTestResult.text()).toBe('50-50');
     });
 
+    it('should be able to right click at a specific position within an element', async () => {
+      const clickTest = await harness.clickTest();
+      const contextmenuTestResult = await harness.contextmenuTestResult();
+      await clickTest.rightClick!(50, 50);
+      expect(await contextmenuTestResult.text()).toBe('50-50-2');
+    });
+
     it('should be able to send key', async () => {
       const input = await harness.input();
       const value = await harness.value();

src/cdk/testing/tests/harnesses/main-component-harness.ts

@@ -34,6 +34,7 @@ export class MainComponentHarness extends ComponentHarness {
   readonly multiSelect = this.locatorFor('#multi-select');
   readonly multiSelectValue = this.locatorFor('#multi-select-value');
   readonly multiSelectChangeEventCounter = this.locatorFor('#multi-select-change-counter');
+  readonly contextmenuTestResult = this.locatorFor('.contextmenu-test-result');
   // Allow null for element
   readonly nullItem = this.locatorForOptional('wrong locator');
   // Allow null for component harness

src/cdk/testing/tests/test-main-component.html

@@ -1,8 +1,9 @@
-<div class="click-test" (click)="onClick($event)"
+<div class="click-test" (click)="onClick($event)" (contextmenu)="onRightClick($event)"
      style="width: 100px; height: 100px; background: grey"
      #clickTestElement>
 </div>
-<div class="click-test-result">{{relativeX}}-{{relativeY}}</div>
+<div class="click-test-result">{{clickResult.x}}-{{clickResult.y}}</div>
+<div class="contextmenu-test-result">{{rightClickResult.x}}-{{rightClickResult.y}}-{{rightClickResult.button}}</div>
 <h1 style="height: 100px; width: 200px;">Main Component</h1>
 <div id="username">Hello {{username}} from Angular 2!</div>
 <div class="counters">

src/cdk/testing/tests/test-main-component.ts

@@ -41,13 +41,13 @@ export class TestMainComponent implements OnDestroy {
   testMethods: string[];
   _isHovering: boolean;
   specialKey = '';
-  relativeX = 0;
-  relativeY = 0;
   singleSelect: string;
   singleSelectChangeEventCount = 0;
   multiSelect: string[] = [];
   multiSelectChangeEventCount = 0;
   _shadowDomSupported = _supportsShadowDom();
+  clickResult = {x: -1, y: -1};
+  rightClickResult = {x: -1, y: -1, button: -1};
 
   @ViewChild('clickTestElement') clickTestElement: ElementRef<HTMLElement>;
   @ViewChild('taskStateResult') taskStateResultElement: ElementRef<HTMLElement>;
@@ -102,14 +102,23 @@ export class TestMainComponent implements OnDestroy {
   }
 
   onClick(event: MouseEvent) {
-    const {top, left} = this.clickTestElement.nativeElement.getBoundingClientRect();
-    this.relativeX = Math.round(event.clientX - left);
-    this.relativeY = Math.round(event.clientY - top);
+    this._assignRelativeCoordinates(event, this.clickResult);
+  }
+
+  onRightClick(event: MouseEvent) {
+    this.rightClickResult.button = event.button;
+    this._assignRelativeCoordinates(event, this.rightClickResult);
   }
 
   runTaskOutsideZone() {
     this._zone.runOutsideAngular(() => setTimeout(() => {
       this.taskStateResultElement.nativeElement.textContent = 'result';
     }, 100));
   }
+
+  private _assignRelativeCoordinates(event: MouseEvent, obj: {x: number, y: number}) {
+    const {top, left} = this.clickTestElement.nativeElement.getBoundingClientRect();
+    obj.x = Math.round(event.clientX - left);
+    obj.y = Math.round(event.clientY - top);
+  }
 }

tools/public_api_guard/cdk/testing.d.ts

@@ -144,6 +144,7 @@ export interface TestElement {
     isFocused(): Promise<boolean>;
     matchesSelector(selector: string): Promise<boolean>;
     mouseAway(): Promise<void>;
+    rightClick?(relativeX: number, relativeY: number): Promise<void>;
     selectOptions?(...optionIndexes: number[]): Promise<void>;
     sendKeys(...keys: (string | TestKey)[]): Promise<void>;
     sendKeys(modifiers: ModifierKeys, ...keys: (string | TestKey)[]): Promise<void>;

tools/public_api_guard/cdk/testing/protractor.d.ts

@@ -14,6 +14,7 @@ export declare class ProtractorElement implements TestElement {
     isFocused(): Promise<boolean>;
     matchesSelector(selector: string): Promise<boolean>;
     mouseAway(): Promise<void>;
+    rightClick(...args: [] | ['center'] | [number, number]): Promise<void>;
     selectOptions(...optionIndexes: number[]): Promise<void>;
     sendKeys(...keys: (string | TestKey)[]): Promise<void>;
     sendKeys(modifiers: ModifierKeys, ...keys: (string | TestKey)[]): Promise<void>;

tools/public_api_guard/cdk/testing/testbed.d.ts

@@ -32,6 +32,7 @@ export declare class UnitTestElement implements TestElement {
     isFocused(): Promise<boolean>;
     matchesSelector(selector: string): Promise<boolean>;
     mouseAway(): Promise<void>;
+    rightClick(...args: [] | ['center'] | [number, number]): Promise<void>;
     selectOptions(...optionIndexes: number[]): Promise<void>;
     sendKeys(...keys: (string | TestKey)[]): Promise<void>;
     sendKeys(modifiers: ModifierKeys, ...keys: (string | TestKey)[]): Promise<void>;