@taiga-ui/event-plugins
Version:
This is a library for optimizing performance sensitive events and declarative preventDefault and stopPropagation
78 lines • 12.4 kB
JavaScript
import { LongtapEvent } from '../types/longtap.event';
import { isIos } from '../utils/is-ios';
const TAP_DELAY = 700;
const SAFE_NAVIGATOR = typeof navigator === 'undefined' ? null : navigator;
const MOVE_THRESHOLD = 15;
export class LongtapEventPlugin {
constructor() {
this.isIOS = !!SAFE_NAVIGATOR && isIos(SAFE_NAVIGATOR);
}
addEventListener(element, _event, handler) {
const removeLongtapEventPolyfill = this.isIOS
? this.listenTouchEvents(element)
: this.listenContextmenuEvent(element);
element.addEventListener('longtap', handler);
return () => {
removeLongtapEventPolyfill();
element.removeEventListener('longtap', handler);
};
}
supports(event) {
return event === 'longtap';
}
listenContextmenuEvent(element) {
return this.manager.addEventListener(element, 'contextmenu.prevent.stop', ({ clientX, clientY }) => {
this.dispatchLongtapEvent(element, clientX, clientY);
});
}
listenTouchEvents(element) {
let longTapTimeout = null;
let touchStartCoords = null;
const reset = () => {
clearTimeout(longTapTimeout);
touchStartCoords = null;
longTapTimeout = null;
};
const removeTouchstartListener = this.manager.addEventListener(element, 'touchstart.zoneless.passive', ({ touches }) => {
const touch = touches[0];
if (!touch) {
return;
}
const { clientX, clientY } = touch;
touchStartCoords = { clientX, clientY };
longTapTimeout = setTimeout(() => {
this.dispatchLongtapEvent(element, clientX, clientY);
reset();
}, TAP_DELAY);
});
const removeTouchmoveListener = this.manager.addEventListener(element, 'touchmove.zoneless.passive', ({ touches }) => {
const touch = touches[0];
if (!touch || !touchStartCoords) {
return;
}
const { clientX, clientY } = touch;
if (Math.hypot(clientX - touchStartCoords.clientX, clientY - touchStartCoords.clientY) <= MOVE_THRESHOLD) {
return;
}
reset();
});
const removeTouchcancelListener = this.manager.addEventListener(element, 'touchcancel.zoneless.passive', reset);
const removeTouchendListener = this.manager.addEventListener(element, 'touchend.zoneless.passive', reset);
return () => {
removeTouchstartListener();
removeTouchmoveListener();
removeTouchcancelListener();
removeTouchendListener();
};
}
dispatchLongtapEvent(element, clientX, clientY) {
element.dispatchEvent(new LongtapEvent('longtap', {
clientX,
clientY,
bubbles: false,
cancelable: false,
composed: false,
}));
}
}
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null : navigator;\nconst MOVE_THRESHOLD = 15;\n\nexport class LongtapEventPlugin implements EventManagerPlugin {\n    private readonly isIOS = !!SAFE_NAVIGATOR && isIos(SAFE_NAVIGATOR);\n\n    public readonly manager!: EventManager;\n\n    public addEventListener(\n        element: HTMLElement,\n        _event: string,\n        handler: (event: Event) => void,\n    ): Function {\n        const removeLongtapEventPolyfill = this.isIOS\n            ? this.listenTouchEvents(element)\n            : this.listenContextmenuEvent(element);\n\n        element.addEventListener('longtap', handler);\n\n        return () => {\n            removeLongtapEventPolyfill();\n\n            element.removeEventListener('longtap', handler);\n        };\n    }\n\n    public supports(event: string): boolean {\n        return event === 'longtap';\n    }\n\n    private listenContextmenuEvent(element: HTMLElement): Function {\n        return this.manager.addEventListener(\n            element,\n            'contextmenu.prevent.stop',\n            ({clientX, clientY}: MouseEvent) => {\n                this.dispatchLongtapEvent(element, clientX, clientY);\n            },\n        );\n    }\n\n    private listenTouchEvents(element: HTMLElement): Function {\n        let longTapTimeout: any = null;\n        let touchStartCoords: {\n            clientX: number;\n            clientY: number;\n        } | null = null;\n\n        const reset = (): void => {\n            clearTimeout(longTapTimeout);\n            touchStartCoords = null;\n            longTapTimeout = null;\n        };\n\n        const removeTouchstartListener = this.manager.addEventListener(\n            element,\n            'touchstart.zoneless.passive',\n            ({touches}: TouchEvent) => {\n                const touch = touches[0];\n\n                if (!touch) {\n                    return;\n                }\n\n                const {clientX, clientY} = touch;\n\n                touchStartCoords = {clientX, clientY};\n\n                longTapTimeout = setTimeout(() => {\n                    this.dispatchLongtapEvent(element, clientX, clientY);\n                    reset();\n                }, TAP_DELAY);\n            },\n        );\n\n        const removeTouchmoveListener = this.manager.addEventListener(\n            element,\n            'touchmove.zoneless.passive',\n            ({touches}: TouchEvent) => {\n                const touch = touches[0];\n\n                if (!touch || !touchStartCoords) {\n                    return;\n                }\n\n                const {clientX, clientY} = touch;\n\n                if (\n                    Math.hypot(\n                        clientX - touchStartCoords.clientX,\n                        clientY - touchStartCoords.clientY,\n                    ) <= MOVE_THRESHOLD\n                ) {\n                    return;\n                }\n\n                reset();\n            },\n        );\n\n        const removeTouchcancelListener = this.manager.addEventListener(\n            element,\n            'touchcancel.zoneless.passive',\n            reset,\n        );\n\n        const removeTouchendListener = this.manager.addEventListener(\n            element,\n            'touchend.zoneless.passive',\n            reset,\n        );\n\n        return () => {\n            removeTouchstartListener();\n            removeTouchmoveListener();\n            removeTouchcancelListener();\n            removeTouchendListener();\n        };\n    }\n\n    private dispatchLongtapEvent(\n        element: HTMLElement,\n        clientX: number,\n        clientY: number,\n    ): void {\n        element.dispatchEvent(\n            new LongtapEvent('longtap', {\n                clientX,\n                clientY,\n                bubbles: false,\n                cancelable: false,\n                composed: false,\n            }),\n        );\n    }\n}\n"]}