ngx-virtual-swiper
Version:
Swiper with virtual scroll.
150 lines • 22.6 kB
JavaScript
import { Directionality } from '@angular/cdk/bidi';
import { CdkVirtualScrollViewport } from '@angular/cdk/scrolling';
import { Directive, HostListener, Inject, Input, Optional } from '@angular/core';
import { Subscription } from 'rxjs';
import { NgxVirtualSwiperOptions } from './options';
import { getClickPositions, getTouchPositions, isNumber } from './utils';
const VERTICAL_ORIENTATION = 'vertical';
const HORIZONTAL_ORIENTATION = 'horizontal';
const RIGHT_TO_LEFT = 'rtl';
export class NgxVirtualSwiperDirective {
constructor(options,
/** to lean more see https://material.angular.io/cdk/scrolling/api */
cdk, dir) {
this.options = options;
this.cdk = cdk;
this.dir = dir;
this.subscription = new Subscription();
// eslint-disable-next-line @typescript-eslint/member-ordering
this.onMousedown = (e) => this.start(getClickPositions(e));
this.onTouchstart = (e) => this.start(getTouchPositions(e));
this.onMousemove = (e) => this.move(getClickPositions(e));
this.onTouchmove = (e) => this.move(getTouchPositions(e));
this.onFinish = () => {
if (this.swiped) {
this.toggleSwiped(false);
this.finalize();
}
};
/** the bug-fix to prevent dragging images while swiping */
this.onDragstart = (e) => e.preventDefault();
this.mousemoveX = (e) => {
if (e) {
const offset = this.cdk.measureScrollOffset();
const c = this.rtl ? -1 : 1;
const delta = (this.clientX - e.clientX) * c;
const value = offset + delta;
if (value >= 0 && value <= this.scrollSize) {
this.cdk.scrollToOffset(Math.abs(value));
this.clientX = e.clientX;
}
}
};
this.mousemoveY = (e) => {
if (e) {
const offset = this.cdk.measureScrollOffset();
const value = offset - e.clientY + this.clientY;
if (value >= 0 && value <= this.scrollSize) {
this.cdk.scrollToOffset(value);
this.clientY = e.clientY;
}
}
};
this.start = (e) => {
this.toggleSwiped(true);
this.clientX = e.clientX;
this.clientY = e.clientY;
this.prevClientX = e.clientX;
this.prevClientY = e.clientY;
};
this.move = (e) => {
if (this.swiped) {
if (this.cdk.orientation === HORIZONTAL_ORIENTATION) {
this.mousemoveX(e);
}
else if (this.cdk.orientation === VERTICAL_ORIENTATION) {
this.mousemoveY(e);
}
}
};
this.toggleSwiped = (value) => {
this.swiped = value;
};
this.finalize = () => {
if (this.options.finalize) {
this.scrollToNearestIndex();
}
};
this.scrollToNearestIndex = () => {
const delta = this.cdk.orientation === HORIZONTAL_ORIENTATION ? this.prevClientX - this.clientX :
this.cdk.orientation === VERTICAL_ORIENTATION ? this.prevClientY - this.clientY :
null;
if (isNumber(delta)) {
const directionDelta = this.rtl ? delta * -1 : delta;
const index = directionDelta > 0 && Math.abs(directionDelta) >= this.options.threshold ? this.index + 1 : this.index;
this.cdk.scrollToIndex(index, 'smooth');
}
};
this.addEventListener = () => {
this.cdk.elementRef.nativeElement.addEventListener('click', this.preventClicks, true);
};
this.removeEventListener = () => {
this.cdk.elementRef.nativeElement.removeEventListener('click', this.preventClicks, true);
};
/** prevent all type of clicks (e.g. click on links, Angular`s click) */
this.preventClicks = (e) => {
if (this.changed && this.options.preventClicks) {
e.stopPropagation();
e.preventDefault();
e.stopImmediatePropagation();
}
};
}
ngOnInit() {
this.addEventListener();
this.subscription.add(this.cdk.scrolledIndexChange.subscribe(i => this.index = i));
}
ngOnDestroy() {
this.removeEventListener();
this.subscription.unsubscribe();
}
get changed() {
let result = false;
if (isNumber(this.prevClientX) && isNumber(this.options.threshold)) {
const deltaX = Math.abs(this.prevClientX - this.clientX);
result = deltaX >= this.options.threshold;
}
if (isNumber(this.prevClientY) && isNumber(this.options.threshold)) {
const deltaY = Math.abs(this.prevClientY - this.clientY);
result = result || deltaY >= this.options.threshold;
}
return result;
}
get rtl() {
var _a;
return ((_a = this.dir) === null || _a === void 0 ? void 0 : _a.value) === RIGHT_TO_LEFT;
}
get scrollSize() {
return this.cdk.getDataLength() * this.itemSize;
}
}
NgxVirtualSwiperDirective.decorators = [
{ type: Directive, args: [{
selector: '[ngxVirtualSwiper]'
},] }
];
NgxVirtualSwiperDirective.ctorParameters = () => [
{ type: NgxVirtualSwiperOptions, decorators: [{ type: Inject, args: [NgxVirtualSwiperOptions,] }] },
{ type: CdkVirtualScrollViewport, decorators: [{ type: Inject, args: [CdkVirtualScrollViewport,] }] },
{ type: Directionality, decorators: [{ type: Optional }, { type: Inject, args: [Directionality,] }] }
];
NgxVirtualSwiperDirective.propDecorators = {
itemSize: [{ type: Input }],
onMousedown: [{ type: HostListener, args: ['mousedown', ['$event'],] }],
onTouchstart: [{ type: HostListener, args: ['touchstart', ['$event'],] }],
onMousemove: [{ type: HostListener, args: ['mousemove', ['$event'],] }],
onTouchmove: [{ type: HostListener, args: ['touchmove', ['$event'],] }],
onFinish: [{ type: HostListener, args: ['document:mouseup',] }, { type: HostListener, args: ['touchend',] }],
onDragstart: [{ type: HostListener, args: ['document:dragstart', ['$event'],] }]
};
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{ Directionality } from '@angular/cdk/bidi';\nimport { CdkVirtualScrollViewport } from '@angular/cdk/scrolling';\nimport { Directive, HostListener, Inject, Input, OnDestroy, OnInit, Optional } from '@angular/core';\nimport { Subscription } from 'rxjs';\nimport { NgxVirtualSwiperOptions } from './options';\nimport { IPositionEvent } from './position-event';\nimport { getClickPositions, getTouchPositions, isNumber } from './utils';\n\nconst VERTICAL_ORIENTATION = 'vertical';\nconst HORIZONTAL_ORIENTATION = 'horizontal';\nconst RIGHT_TO_LEFT = 'rtl';\n\n@Directive({\n    selector: '[ngxVirtualSwiper]'\n})\nexport class NgxVirtualSwiperDirective implements OnInit, OnDestroy {\n\n    @Input() public itemSize: number;\n    public readonly subscription = new Subscription();\n    public index: number;\n    public swiped: boolean;\n    public clientX: number;\n    public clientY: number;\n    public prevClientX: number;\n    public prevClientY: number;\n\n    public constructor(\n        @Inject(NgxVirtualSwiperOptions) private options: NgxVirtualSwiperOptions,\n        /** to lean more see https://material.angular.io/cdk/scrolling/api */\n        @Inject(CdkVirtualScrollViewport) private cdk: CdkVirtualScrollViewport,\n        @Optional() @Inject(Directionality) private dir?: Directionality\n    ) { }\n\n    public ngOnInit(): void {\n        this.addEventListener();\n        this.subscription.add(this.cdk.scrolledIndexChange.subscribe(i => this.index = i));\n    }\n\n    public ngOnDestroy(): void {\n        this.removeEventListener();\n        this.subscription.unsubscribe();\n    }\n\n    // eslint-disable-next-line @typescript-eslint/member-ordering\n    @HostListener('mousedown', ['$event'])\n    public onMousedown = (e: IPositionEvent): void => this.start(getClickPositions(e));\n\n    @HostListener('touchstart', ['$event'])\n    public onTouchstart = (e: { touches: IPositionEvent[] }): void => this.start(getTouchPositions(e));\n\n    @HostListener('mousemove', ['$event'])\n    public onMousemove = (e: IPositionEvent): void => this.move(getClickPositions(e));\n\n    @HostListener('touchmove', ['$event'])\n    public onTouchmove = (e: { touches: IPositionEvent[] }): void => this.move(getTouchPositions(e));\n\n    @HostListener('document:mouseup')\n    @HostListener('touchend')\n    public onFinish = (): void => {\n        if (this.swiped) {\n            this.toggleSwiped(false);\n            this.finalize();\n        }\n    };\n\n    /** the bug-fix to prevent dragging images while swiping */\n    @HostListener('document:dragstart', ['$event'])\n    public onDragstart = (e: { preventDefault: any }): void => e.preventDefault();\n\n    public get changed(): boolean {\n        let result = false;\n        if (isNumber(this.prevClientX) && isNumber(this.options.threshold)) {\n            const deltaX = Math.abs(this.prevClientX - this.clientX);\n            result = deltaX >= this.options.threshold;\n        }\n        if (isNumber(this.prevClientY) && isNumber(this.options.threshold)) {\n            const deltaY = Math.abs(this.prevClientY - this.clientY);\n            result = result || deltaY >= this.options.threshold;\n        }\n        return result;\n    }\n\n    public get rtl(): boolean {\n        return this.dir?.value === RIGHT_TO_LEFT;\n    }\n\n    public get scrollSize(): number {\n        return this.cdk.getDataLength() * this.itemSize;\n    }\n\n    public mousemoveX = (e: IPositionEvent): void => {\n        if (e) {\n            const offset = this.cdk.measureScrollOffset();\n            const c = this.rtl ? -1 : 1;\n            const delta = (this.clientX - e.clientX) * c;\n            const value = offset + delta;\n            if (value >= 0 && value <= this.scrollSize) {\n                this.cdk.scrollToOffset(Math.abs(value));\n                this.clientX = e.clientX;\n            }\n        }\n    };\n\n    public mousemoveY = (e: IPositionEvent): void => {\n        if (e) {\n            const offset = this.cdk.measureScrollOffset();\n            const value = offset - e.clientY + this.clientY;\n            if (value >= 0 && value <= this.scrollSize) {\n                this.cdk.scrollToOffset(value);\n                this.clientY = e.clientY;\n            }\n        }\n    };\n\n    public start = (e: IPositionEvent): void => {\n        this.toggleSwiped(true);\n        this.clientX = e.clientX;\n        this.clientY = e.clientY;\n        this.prevClientX = e.clientX;\n        this.prevClientY = e.clientY;\n    };\n\n    public move = (e: IPositionEvent): void => {\n        if (this.swiped) {\n            if (this.cdk.orientation === HORIZONTAL_ORIENTATION) {\n                this.mousemoveX(e);\n            } else if (this.cdk.orientation === VERTICAL_ORIENTATION) {\n                this.mousemoveY(e);\n            }\n        }\n    };\n\n    public toggleSwiped = (value: boolean): void => {\n        this.swiped = value;\n    };\n\n    public finalize = (): void => {\n        if (this.options.finalize) {\n            this.scrollToNearestIndex();\n        }\n    };\n\n    public scrollToNearestIndex = (): void => {\n        const delta = this.cdk.orientation === HORIZONTAL_ORIENTATION ? this.prevClientX - this.clientX :\n            this.cdk.orientation === VERTICAL_ORIENTATION ? this.prevClientY - this.clientY :\n                null;\n        if (isNumber(delta)) {\n            const directionDelta = this.rtl ? delta * -1 : delta;\n            const index = directionDelta > 0 && Math.abs(directionDelta) >= this.options.threshold ? this.index + 1 : this.index;\n            this.cdk.scrollToIndex(index, 'smooth');\n        }\n    };\n\n    public addEventListener = (): void => {\n        this.cdk.elementRef.nativeElement.addEventListener('click', this.preventClicks, true);\n    };\n\n    public removeEventListener = (): void => {\n        this.cdk.elementRef.nativeElement.removeEventListener('click', this.preventClicks, true);\n    };\n\n    /** prevent all type of clicks (e.g. click on links, Angular`s click) */\n    public preventClicks = (e: MouseEvent): void => {\n        if (this.changed && this.options.preventClicks) {\n            e.stopPropagation();\n            e.preventDefault();\n            e.stopImmediatePropagation();\n        }\n    };\n}\n"]}