ng-zorro-antd
Version:
An enterprise-class UI components based on Ant Design and Angular
160 lines • 20.9 kB
JavaScript
/**
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
*/
import { Directive, ElementRef, EventEmitter, NgZone, Output } from '@angular/core';
import { fromEvent, Subscription } from 'rxjs';
const MIN_SWIPE_DISTANCE = 0.1;
const STOP_SWIPE_DISTANCE = 0.01;
const REFRESH_INTERVAL = 20;
const SPEED_OFF_MULTIPLE = Math.pow(0.995, REFRESH_INTERVAL);
export class NzTabScrollListDirective {
constructor(ngZone, elementRef) {
this.ngZone = ngZone;
this.elementRef = elementRef;
this.lastWheelDirection = null;
this.lastWheelTimestamp = 0;
this.lastTimestamp = 0;
this.lastTimeDiff = 0;
this.lastMixedWheel = 0;
this.lastWheelPrevent = false;
this.touchPosition = null;
this.lastOffset = null;
this.motion = -1;
this.unsubscribe = () => void 0;
this.offsetChange = new EventEmitter();
this.tabScroll = new EventEmitter();
this.onTouchEnd = (e) => {
if (!this.touchPosition) {
return;
}
const lastOffset = this.lastOffset;
const lastTimeDiff = this.lastTimeDiff;
this.lastOffset = this.touchPosition = null;
if (lastOffset) {
const distanceX = lastOffset.x / lastTimeDiff;
const distanceY = lastOffset.y / lastTimeDiff;
const absX = Math.abs(distanceX);
const absY = Math.abs(distanceY);
// Skip swipe if low distance
if (Math.max(absX, absY) < MIN_SWIPE_DISTANCE) {
return;
}
let currentX = distanceX;
let currentY = distanceY;
this.motion = window.setInterval(() => {
if (Math.abs(currentX) < STOP_SWIPE_DISTANCE && Math.abs(currentY) < STOP_SWIPE_DISTANCE) {
window.clearInterval(this.motion);
return;
}
currentX *= SPEED_OFF_MULTIPLE;
currentY *= SPEED_OFF_MULTIPLE;
this.onOffset(currentX * REFRESH_INTERVAL, currentY * REFRESH_INTERVAL, e);
}, REFRESH_INTERVAL);
}
};
this.onTouchMove = (e) => {
if (!this.touchPosition) {
return;
}
e.preventDefault();
const { screenX, screenY } = e.touches[0];
const offsetX = screenX - this.touchPosition.x;
const offsetY = screenY - this.touchPosition.y;
this.onOffset(offsetX, offsetY, e);
const now = Date.now();
this.lastTimeDiff = now - this.lastTimestamp;
this.lastTimestamp = now;
this.lastOffset = { x: offsetX, y: offsetY };
this.touchPosition = { x: screenX, y: screenY };
};
this.onTouchStart = (e) => {
const { screenX, screenY } = e.touches[0];
this.touchPosition = { x: screenX, y: screenY };
window.clearInterval(this.motion);
};
this.onWheel = (e) => {
const { deltaX, deltaY } = e;
let mixed;
const absX = Math.abs(deltaX);
const absY = Math.abs(deltaY);
if (absX === absY) {
mixed = this.lastWheelDirection === 'x' ? deltaX : deltaY;
}
else if (absX > absY) {
mixed = deltaX;
this.lastWheelDirection = 'x';
}
else {
mixed = deltaY;
this.lastWheelDirection = 'y';
}
// Optimize mac touch scroll
const now = Date.now();
const absMixed = Math.abs(mixed);
if (now - this.lastWheelTimestamp > 100 || absMixed - this.lastMixedWheel > 10) {
this.lastWheelPrevent = false;
}
this.onOffset(-mixed, -mixed, e);
if (e.defaultPrevented || this.lastWheelPrevent) {
this.lastWheelPrevent = true;
}
this.lastWheelTimestamp = now;
this.lastMixedWheel = absMixed;
};
}
ngOnInit() {
this.unsubscribe = this.ngZone.runOutsideAngular(() => {
const el = this.elementRef.nativeElement;
const wheel$ = fromEvent(el, 'wheel');
const touchstart$ = fromEvent(el, 'touchstart');
const touchmove$ = fromEvent(el, 'touchmove');
const touchend$ = fromEvent(el, 'touchend');
const subscription = new Subscription();
subscription.add(this.subscribeWrap('wheel', wheel$, this.onWheel));
subscription.add(this.subscribeWrap('touchstart', touchstart$, this.onTouchStart));
subscription.add(this.subscribeWrap('touchmove', touchmove$, this.onTouchMove));
subscription.add(this.subscribeWrap('touchend', touchend$, this.onTouchEnd));
return () => {
subscription.unsubscribe();
};
});
}
subscribeWrap(type, observable, handler) {
return observable.subscribe(event => {
this.tabScroll.emit({
type,
event
});
if (!event.defaultPrevented) {
handler(event);
}
});
}
onOffset(x, y, event) {
this.ngZone.run(() => {
this.offsetChange.emit({
x,
y,
event
});
});
}
ngOnDestroy() {
this.unsubscribe();
}
}
NzTabScrollListDirective.decorators = [
{ type: Directive, args: [{
selector: '[nzTabScrollList]'
},] }
];
NzTabScrollListDirective.ctorParameters = () => [
{ type: NgZone },
{ type: ElementRef }
];
NzTabScrollListDirective.propDecorators = {
offsetChange: [{ type: Output }],
tabScroll: [{ type: Output }]
};
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* Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE\n */\n\nimport { Directive, ElementRef, EventEmitter, NgZone, OnDestroy, OnInit, Output } from '@angular/core';\n\nimport { fromEvent, Observable, Subscription } from 'rxjs';\n\nimport { NzTabScrollEvent, NzTabScrollEventHandlerFun, NzTabScrollListOffset, NzTabScrollListOffsetEvent } from './interfaces';\n\nconst MIN_SWIPE_DISTANCE = 0.1;\nconst STOP_SWIPE_DISTANCE = 0.01;\nconst REFRESH_INTERVAL = 20;\nconst SPEED_OFF_MULTIPLE = 0.995 ** REFRESH_INTERVAL;\n\n@Directive({\n  selector: '[nzTabScrollList]'\n})\nexport class NzTabScrollListDirective implements OnInit, OnDestroy {\n  lastWheelDirection: 'x' | 'y' | null = null;\n  lastWheelTimestamp = 0;\n  lastTimestamp = 0;\n  lastTimeDiff = 0;\n  lastMixedWheel = 0;\n  lastWheelPrevent = false;\n  touchPosition: NzTabScrollListOffset | null = null;\n  lastOffset: NzTabScrollListOffset | null = null;\n  motion = -1;\n\n  unsubscribe: () => void = () => void 0;\n\n  @Output() readonly offsetChange = new EventEmitter<NzTabScrollListOffsetEvent>();\n  @Output() readonly tabScroll = new EventEmitter<NzTabScrollEvent>();\n\n  constructor(private ngZone: NgZone, private elementRef: ElementRef<HTMLElement>) {}\n\n  ngOnInit(): void {\n    this.unsubscribe = this.ngZone.runOutsideAngular(() => {\n      const el = this.elementRef.nativeElement;\n\n      const wheel$ = fromEvent<WheelEvent>(el, 'wheel');\n      const touchstart$ = fromEvent<TouchEvent>(el, 'touchstart');\n      const touchmove$ = fromEvent<TouchEvent>(el, 'touchmove');\n      const touchend$ = fromEvent<TouchEvent>(el, 'touchend');\n\n      const subscription = new Subscription();\n      subscription.add(this.subscribeWrap('wheel', wheel$, this.onWheel));\n      subscription.add(this.subscribeWrap('touchstart', touchstart$, this.onTouchStart));\n      subscription.add(this.subscribeWrap('touchmove', touchmove$, this.onTouchMove));\n      subscription.add(this.subscribeWrap('touchend', touchend$, this.onTouchEnd));\n\n      return () => {\n        subscription.unsubscribe();\n      };\n    });\n  }\n\n  subscribeWrap<T extends NzTabScrollEvent['event']>(\n    type: NzTabScrollEvent['type'],\n    observable: Observable<T>,\n    handler: NzTabScrollEventHandlerFun<T>\n  ): Subscription {\n    return observable.subscribe(event => {\n      this.tabScroll.emit({\n        type,\n        event\n      } as NzTabScrollEvent);\n      if (!event.defaultPrevented) {\n        handler(event);\n      }\n    });\n  }\n\n  onTouchEnd = (e: TouchEvent): void => {\n    if (!this.touchPosition) {\n      return;\n    }\n    const lastOffset = this.lastOffset;\n    const lastTimeDiff = this.lastTimeDiff;\n\n    this.lastOffset = this.touchPosition = null;\n\n    if (lastOffset) {\n      const distanceX = lastOffset.x / lastTimeDiff;\n      const distanceY = lastOffset.y / lastTimeDiff;\n      const absX = Math.abs(distanceX);\n      const absY = Math.abs(distanceY);\n\n      // Skip swipe if low distance\n      if (Math.max(absX, absY) < MIN_SWIPE_DISTANCE) {\n        return;\n      }\n\n      let currentX = distanceX;\n      let currentY = distanceY;\n\n      this.motion = window.setInterval(() => {\n        if (Math.abs(currentX) < STOP_SWIPE_DISTANCE && Math.abs(currentY) < STOP_SWIPE_DISTANCE) {\n          window.clearInterval(this.motion);\n          return;\n        }\n\n        currentX *= SPEED_OFF_MULTIPLE;\n        currentY *= SPEED_OFF_MULTIPLE;\n        this.onOffset(currentX * REFRESH_INTERVAL, currentY * REFRESH_INTERVAL, e);\n      }, REFRESH_INTERVAL);\n    }\n  };\n\n  onTouchMove = (e: TouchEvent): void => {\n    if (!this.touchPosition) {\n      return;\n    }\n\n    e.preventDefault();\n    const { screenX, screenY } = e.touches[0];\n\n    const offsetX = screenX - this.touchPosition.x;\n    const offsetY = screenY - this.touchPosition.y;\n    this.onOffset(offsetX, offsetY, e);\n    const now = Date.now();\n\n    this.lastTimeDiff = now - this.lastTimestamp;\n    this.lastTimestamp = now;\n    this.lastOffset = { x: offsetX, y: offsetY };\n    this.touchPosition = { x: screenX, y: screenY };\n  };\n\n  onTouchStart = (e: TouchEvent): void => {\n    const { screenX, screenY } = e.touches[0];\n    this.touchPosition = { x: screenX, y: screenY };\n    window.clearInterval(this.motion);\n  };\n\n  onWheel = (e: WheelEvent): void => {\n    const { deltaX, deltaY } = e;\n    let mixed: number;\n    const absX = Math.abs(deltaX);\n    const absY = Math.abs(deltaY);\n\n    if (absX === absY) {\n      mixed = this.lastWheelDirection === 'x' ? deltaX : deltaY;\n    } else if (absX > absY) {\n      mixed = deltaX;\n      this.lastWheelDirection = 'x';\n    } else {\n      mixed = deltaY;\n      this.lastWheelDirection = 'y';\n    }\n\n    // Optimize mac touch scroll\n    const now = Date.now();\n    const absMixed = Math.abs(mixed);\n\n    if (now - this.lastWheelTimestamp > 100 || absMixed - this.lastMixedWheel > 10) {\n      this.lastWheelPrevent = false;\n    }\n    this.onOffset(-mixed, -mixed, e);\n    if (e.defaultPrevented || this.lastWheelPrevent) {\n      this.lastWheelPrevent = true;\n    }\n\n    this.lastWheelTimestamp = now;\n    this.lastMixedWheel = absMixed;\n  };\n\n  onOffset(x: number, y: number, event: Event): void {\n    this.ngZone.run(() => {\n      this.offsetChange.emit({\n        x,\n        y,\n        event\n      });\n    });\n  }\n\n  ngOnDestroy(): void {\n    this.unsubscribe();\n  }\n}\n"]}