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| 1 | +import { StackLayout } from '../../layouts/stack-layout'; |
| 2 | +import { GestureTypes } from '../../gestures'; |
| 3 | + |
| 4 | +function nextTurn() { |
| 5 | + return new Promise((resolve) => setTimeout(resolve)); |
| 6 | +} |
| 7 | + |
| 8 | +class FakeRecognizer { |
| 9 | + delegate: any; |
| 10 | + target: any; |
| 11 | + initWithTargetAction(target: any) { |
| 12 | + this.target = target; |
| 13 | + return this; |
| 14 | + } |
| 15 | +} |
| 16 | + |
| 17 | +// A loaded view whose native view records the recognizers core adds and removes. |
| 18 | +function loadedView() { |
| 19 | + const view = new StackLayout(); |
| 20 | + const added: FakeRecognizer[] = []; |
| 21 | + const removed: FakeRecognizer[] = []; |
| 22 | + (view as any).nativeViewProtected = { |
| 23 | + addGestureRecognizer: (recognizer: FakeRecognizer) => added.push(recognizer), |
| 24 | + removeGestureRecognizer: (recognizer: FakeRecognizer) => removed.push(recognizer), |
| 25 | + }; |
| 26 | + (view as any)._isLoaded = true; |
| 27 | + return { view, added, removed }; |
| 28 | +} |
| 29 | + |
| 30 | +describe('gesture listeners', () => { |
| 31 | + const NSObject = (global as any).NSObject; |
| 32 | + const originalNew = NSObject.new; |
| 33 | + |
| 34 | + beforeAll(() => { |
| 35 | + (global as any).UITapGestureRecognizer = { alloc: () => new FakeRecognizer() }; |
| 36 | + // Let recognizer targets (NSObject subclasses) be created as themselves. |
| 37 | + NSObject.new = function () { |
| 38 | + return new this(); |
| 39 | + }; |
| 40 | + }); |
| 41 | + |
| 42 | + afterAll(() => { |
| 43 | + delete (global as any).UITapGestureRecognizer; |
| 44 | + NSObject.new = originalNew; |
| 45 | + }); |
| 46 | + |
| 47 | + it('keeps the recognizer when a listener is swapped in the same turn', async () => { |
| 48 | + const { view, added, removed } = loadedView(); |
| 49 | + const first = vi.fn(); |
| 50 | + const second = vi.fn(); |
| 51 | + |
| 52 | + view.on('tap', first); |
| 53 | + const observer = view.getGestureObservers(GestureTypes.tap)[0]; |
| 54 | + view.off('tap', first); |
| 55 | + view.on('tap', second); |
| 56 | + await nextTurn(); |
| 57 | + |
| 58 | + expect(added).toHaveLength(1); |
| 59 | + expect(removed).toHaveLength(0); |
| 60 | + expect(view.getGestureObservers(GestureTypes.tap)).toEqual([observer]); |
| 61 | + expect(observer.callback).toBe(second); |
| 62 | + }); |
| 63 | + |
| 64 | + it('calls only the new listener for the gesture in progress', () => { |
| 65 | + const { view, added } = loadedView(); |
| 66 | + const first = vi.fn(); |
| 67 | + const second = vi.fn(); |
| 68 | + const context = {}; |
| 69 | + |
| 70 | + view.on('tap', first); |
| 71 | + view.off('tap', first); |
| 72 | + view.on('tap', second, context); |
| 73 | + |
| 74 | + added[0].target.recognize({ locationInView: () => ({ x: 1, y: 2 }), numberOfTouches: 1 }); |
| 75 | + |
| 76 | + expect(first).not.toHaveBeenCalled(); |
| 77 | + expect(second).toHaveBeenCalledTimes(1); |
| 78 | + expect(second.mock.contexts[0]).toBe(context); |
| 79 | + expect(second.mock.calls[0][0].getX()).toBe(1); |
| 80 | + }); |
| 81 | + |
| 82 | + it('stops calling a removed listener right away', () => { |
| 83 | + const { view, added } = loadedView(); |
| 84 | + const listener = vi.fn(); |
| 85 | + |
| 86 | + view.on('tap', listener); |
| 87 | + view.off('tap', listener); |
| 88 | + added[0].target.recognize({ locationInView: () => ({ x: 0, y: 0 }), numberOfTouches: 1 }); |
| 89 | + |
| 90 | + expect(listener).not.toHaveBeenCalled(); |
| 91 | + expect(view.getGestureObservers(GestureTypes.tap)).toBeUndefined(); |
| 92 | + }); |
| 93 | + |
| 94 | + it('removes the recognizer in the next turn when no listener takes it over', async () => { |
| 95 | + const { view, added, removed } = loadedView(); |
| 96 | + const listener = vi.fn(); |
| 97 | + |
| 98 | + view.on('tap', listener); |
| 99 | + const observer = view.getGestureObservers(GestureTypes.tap)[0]; |
| 100 | + const disconnect = vi.spyOn(observer, 'disconnect'); |
| 101 | + view.off('tap', listener); |
| 102 | + |
| 103 | + expect(removed).toHaveLength(0); |
| 104 | + await nextTurn(); |
| 105 | + |
| 106 | + expect(disconnect).toHaveBeenCalledTimes(1); |
| 107 | + expect(removed).toEqual(added); |
| 108 | + |
| 109 | + // A later listener gets a fresh recognizer. |
| 110 | + view.on('tap', listener); |
| 111 | + expect(added).toHaveLength(2); |
| 112 | + }); |
| 113 | + |
| 114 | + it('does not hand a released recognizer to another gesture type', async () => { |
| 115 | + const { view } = loadedView(); |
| 116 | + const tap = vi.fn(); |
| 117 | + const doubleTap = vi.fn(); |
| 118 | + |
| 119 | + view.on('tap', tap); |
| 120 | + const tapObserver = view.getGestureObservers(GestureTypes.tap)[0]; |
| 121 | + view.off('tap', tap); |
| 122 | + view.on('doubleTap', doubleTap); |
| 123 | + |
| 124 | + expect(view.getGestureObservers(GestureTypes.doubleTap)[0]).not.toBe(tapObserver); |
| 125 | + }); |
| 126 | + |
| 127 | + it('still ignores a listener that is already added', () => { |
| 128 | + const { view, added } = loadedView(); |
| 129 | + const listener = vi.fn(); |
| 130 | + |
| 131 | + view.on('tap', listener); |
| 132 | + view.on('tap', listener); |
| 133 | + |
| 134 | + expect(view.getGestureObservers(GestureTypes.tap)).toHaveLength(1); |
| 135 | + expect(added).toHaveLength(1); |
| 136 | + }); |
| 137 | +}); |
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