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@offensichtbar-codestock/ngx-flex-masonry-grid

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Angular Module for displaying items in a flex-based masonry layout without any third party dependencies

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import { Component, ElementRef, ContentChildren, HostListener, Output, EventEmitter } from '@angular/core'; import { NgxFlexMasonryGridItemComponent } from './ngx-flex-masonry-grid-item.component'; import { NgxFlexMasonryGridService } from "./ngx-flex-masonry-grid.service"; import { CIRCULAR_IMPORT_PARENT } from './circular-imports'; import { takeWhile } from 'rxjs/operators'; export class NgxFlexMasonryGridComponent { constructor(_element, service) { this._element = _element; this.service = service; // Outputs this.layoutComplete = new EventEmitter(); this.itemRemoved = new EventEmitter(); this.itemLoaded = new EventEmitter(); this.itemsLoaded = new EventEmitter(); this._timeoutID = 0; this._cols = 0; this._rows = 0; this._item_heights = []; this._row_heights = []; this.isAlive = true; this.service.layoutshouldbeupdated.pipe(takeWhile(() => this.isAlive)).subscribe((item) => { this.itemLoaded.emit(item); item.playAnimation(); item.isready = true; this.layout(); }); this.service.imageobserved.pipe(takeWhile(() => this.isAlive)).subscribe((param) => { this.add(param); }); this.service.itemremoved.pipe(takeWhile(() => this.isAlive)).subscribe((item) => { this.itemRemoved.emit(item); this.layout(); }); this.service.allitemsloaded.pipe(takeWhile(() => this.isAlive)).subscribe(() => { this.itemsLoaded.emit(this.items.length); this.layout(); }); } onResize(event) { clearTimeout(this._timeoutID); this._timeoutID = setTimeout(() => { this.layout(); }, 40); } ngOnInit() { } forceUpdateLayout() { var _a, _b; if (((_a = this.items) === null || _a === void 0 ? void 0 : _a.length) && ((_b = this.items) === null || _b === void 0 ? void 0 : _b.length) !== 0) { let items = this.items.toArray().filter((item) => { return item.isready; }); if (this.service.loadeditems.length === items.length) { this.layout(); } } } layout() { var _a; if (!((_a = this.items) === null || _a === void 0 ? void 0 : _a.length)) return; this._cols = Math.round(this._element.nativeElement.offsetWidth / this.items.toArray()[0].width); this._rows = Math.ceil(this.items.length / this._cols); this._item_heights = this.items.map(el => el.height); this._row_heights = this.getRowHeights(); const offsets = this.getElementOffsets(); this.translateElements(offsets); if (this.service.loadeditems.length === this.items.length) { this.layoutComplete.emit(); } } add(params) { this.service.addItem(params.item, this.items.length); } getRowHeights() { let rowheights = []; for (let row = 0; row < this._rows; row++) { const heightgroup = this._item_heights.slice(row * this._cols, (row + 1) * this._cols); // heightgroup caches slice (slice length === cols length) of _el_heights array const rowHeights = Math.max(...heightgroup); rowheights.push(rowHeights); } return rowheights; } getElementOffsets() { const el_heightgap = [...Array(this._cols)].map(e => []); this._item_heights.forEach((height, index) => { const current_gap = this._row_heights[Math.floor(index / this._cols)] - height; el_heightgap[index % this._cols].push(current_gap); }); const el_offsets = [...Array(this._cols)].map(e => []); /** * Accumulates element offsets (final translation values) from el_heightgap array * Resets translation for first row by unshifting value zero to each subarray */ for (let gap = 0; gap < el_heightgap.length; gap++) { let accumulation = 0; // Cache for accumulated height differences for each col el_offsets[gap] = el_heightgap[gap].map((val) => accumulation += val); // Maps accumulated height difference values to offset array el_offsets[gap].pop(); // Removes last value, because the last element needs to be translated by the value of its predecessor el_offsets[gap].unshift(0); // Adds zero offsets for first item per col, because first item doesn't need to be translated } let elementoffsets = []; for (let i = 0; i < this.items.length; i++) { const iterator = i % el_offsets.length; const counter = Math.floor(i / el_offsets.length); elementoffsets.push(el_offsets[iterator][counter]); } this.setContainerHeight(); return elementoffsets; } setContainerHeight() { var _a; if (this.items.length <= 0) return; let containerHeight = []; for (let col = 0; col < this._cols; col++) { containerHeight.push([0]); let i = 0; while (col + this._cols * i < this.items.length) { let currVal = containerHeight[col % this._cols]; let newVal = (_a = this.items.toArray()[col + i * this._cols]) === null || _a === void 0 ? void 0 : _a.height; containerHeight[col % this._cols] = parseInt(currVal) + newVal; i++; } } this._element.nativeElement.style.height = `${Math.max(...containerHeight)}px`; } translateElements(heights) { this.items.forEach((child, index) => { child.translateY = heights[index]; }); } ngAfterContentInit() { } ngOnDestroy() { this.isAlive = false; this.service.clearStack(); } } NgxFlexMasonryGridComponent.decorators = [ { type: Component, args: [{ selector: 'osb-ngx-flexmasonry-grid', template: '<ng-content></ng-content> ', providers: [ NgxFlexMasonryGridService, { provide: CIRCULAR_IMPORT_PARENT, useExisting: NgxFlexMasonryGridComponent } ], styles: [` :host::ng-deep > * { visibility: hidden; box-sizing: border-box; backface-visibility:hidden; } `] },] } ]; NgxFlexMasonryGridComponent.ctorParameters = () => [ { type: ElementRef }, { type: NgxFlexMasonryGridService } ]; NgxFlexMasonryGridComponent.propDecorators = { layoutComplete: [{ type: Output }], itemRemoved: [{ type: Output }], itemLoaded: [{ type: Output }], itemsLoaded: [{ type: Output }], items: [{ type: ContentChildren, args: [NgxFlexMasonryGridItemComponent,] }], onResize: [{ type: HostListener, args: ['window:resize', ['$event'],] }] }; //# 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{\n    Component, \n    OnInit,\n    OnDestroy,\n    ElementRef, \n    ContentChildren, \n    QueryList, \n    HostListener, \n    AfterContentInit,\n    Output,\n    EventEmitter\n} from '@angular/core';\nimport { NgxFlexMasonryGridItemComponent } from './ngx-flex-masonry-grid-item.component';\nimport {NgxFlexMasonryGridLoadingParams} from './ngx-flex-masonry-grid-options';\nimport { NgxFlexMasonryGridService } from \"./ngx-flex-masonry-grid.service\";\nimport {CIRCULAR_IMPORT_PARENT, CircularImportsParent} from './circular-imports';\nimport { takeWhile } from 'rxjs/operators';\n\n@Component({ \n    selector: 'osb-ngx-flexmasonry-grid',\n     template: '<ng-content></ng-content> ', \n     styles: [`\n        \n\n        :host::ng-deep  > * {        \n            visibility: hidden;\n            box-sizing: border-box;\n            backface-visibility:hidden;\n        }\n    `],\n     providers: [\n        NgxFlexMasonryGridService,\n        {\n          provide: CIRCULAR_IMPORT_PARENT,\n          useExisting: NgxFlexMasonryGridComponent\n        }\n      ]\n\n}) \n     \nexport class NgxFlexMasonryGridComponent implements OnInit, OnDestroy, AfterContentInit, CircularImportsParent  {\n\n    // Outputs\n    @Output() layoutComplete: EventEmitter<any> = new EventEmitter<any>();\n    @Output() itemRemoved: EventEmitter<NgxFlexMasonryGridItemComponent> = new EventEmitter<NgxFlexMasonryGridItemComponent>();\n    @Output() itemLoaded: EventEmitter<NgxFlexMasonryGridItemComponent> = new EventEmitter<NgxFlexMasonryGridItemComponent>();\n    @Output() itemsLoaded: EventEmitter<number> = new EventEmitter<number>();\n\n    // Inputs\n    @ContentChildren(NgxFlexMasonryGridItemComponent)  items!: QueryList<NgxFlexMasonryGridItemComponent>;\n    @HostListener('window:resize', ['$event'])\n    onResize(event:any) {\n\n        clearTimeout(this._timeoutID);\n        this._timeoutID = setTimeout(() => {\n            this.layout();\n        },40);\n        \n    }\n\n    private _timeoutID: any = 0;\n    private  _cols: number = 0;\n    private  _rows: number = 0;\n    private _item_heights: Array<number> = [];\n    private _row_heights: Array<number> = [];\n    private isAlive : boolean = true;\n\n\n    constructor(private _element: ElementRef, public service: NgxFlexMasonryGridService) {\n\n        this.service.layoutshouldbeupdated.pipe(takeWhile(() => this.isAlive)).subscribe((item:NgxFlexMasonryGridItemComponent) => {\n            this.itemLoaded.emit(item)\n            item.playAnimation();           \n            item.isready = true;\n            this.layout();\n          \n        });\n        \n        this.service.imageobserved.pipe(takeWhile(() => this.isAlive)).subscribe((param: NgxFlexMasonryGridLoadingParams) => {\n            this.add(param);\n        });\n\n       this.service.itemremoved.pipe(takeWhile(() => this.isAlive)).subscribe((item:NgxFlexMasonryGridItemComponent) => {\n            this.itemRemoved.emit(item)\n            this.layout();\n           \n        });\n\n        this.service.allitemsloaded.pipe(takeWhile(() => this.isAlive)).subscribe(() => {\n            this.itemsLoaded.emit(this.items.length);\n            this.layout();\n            \n        });\n    }\n\n    ngOnInit() {}\n\n    public forceUpdateLayout() {\n        if(this.items?.length && this.items?.length !== 0) {\n            let items:Array<NgxFlexMasonryGridItemComponent> = this.items.toArray().filter((item: NgxFlexMasonryGridItemComponent) => {\n             \n                return item.isready;\n            });\n\n            if(this.service.loadeditems.length === items.length) {\n                this.layout();\n            }\n        }\n    }\n\n    private layout() {\n        if(!this.items?.length)\n            return;\n        this._cols = Math.round(this._element.nativeElement.offsetWidth / this.items.toArray()[0].width ); \n        this._rows = Math.ceil(this.items.length / this._cols);\n        this._item_heights = this.items.map(el => el.height);      \n        \n        this._row_heights = this.getRowHeights();\n\n        const offsets = this.getElementOffsets();\n        this.translateElements(offsets);   \n\n        \n        if(this.service.loadeditems.length === this.items.length) {\n            this.layoutComplete.emit();\n        }\n    }\n\n    public add(params: NgxFlexMasonryGridLoadingParams) {\n        this.service.addItem(params.item, this.items.length);\n    }\n\n    private getRowHeights(): Array<number> {\n\n        let rowheights = [];\n        for(let row = 0; row < this._rows; row++) {\n            const heightgroup = this._item_heights.slice(row * this._cols, (row + 1) * this._cols); // heightgroup caches slice (slice length === cols length) of _el_heights array\n            const rowHeights = Math.max(...heightgroup);\n            rowheights.push(rowHeights);\n        }\n\n        return rowheights;\n    }\n\n    private getElementOffsets(): Array<number> {\n\n        const el_heightgap:any[] = [...Array(this._cols)].map(e => []);\n        this._item_heights.forEach((height, index) => {\n            const current_gap:number  = this._row_heights[Math.floor(index / this._cols)] - height;\n            el_heightgap[index % this._cols].push(current_gap);\n        });\n\n        \n        const el_offsets:any[] = [...Array(this._cols)].map(e => []);\n        \n        /**\n         *  Accumulates element offsets (final translation values) from el_heightgap array\n         *  Resets translation for first row by unshifting value zero to each subarray\n         */\n        for(let gap = 0; gap < el_heightgap.length; gap++) {\n\n            let accumulation = 0; // Cache for accumulated height differences for each col\n            el_offsets[gap] = el_heightgap[gap].map((val:number) => accumulation += val); // Maps accumulated height difference values to offset array\n            el_offsets[gap].pop(); // Removes last value, because the last element needs to be translated by the value of its predecessor\n            el_offsets[gap].unshift(0); // Adds zero offsets for first item per col, because first item doesn't need to be translated\n        }\n\n        \n        let elementoffsets:any[] = [];\n        for(let i = 0; i < this.items.length; i++) {\n            const iterator = i % el_offsets.length;\n            const counter = Math.floor(i / el_offsets.length);\n            elementoffsets.push(el_offsets[iterator][counter]);\n        }\n\n        this.setContainerHeight();\n\n        return elementoffsets;\n       \n    }\n\n    private setContainerHeight() {\n        if(this.items.length <= 0)\n            return;\n\n        let containerHeight:any[] = [];\n        for(let col:number = 0; col < this._cols; col++) {\n            containerHeight.push([0]);\n            let i = 0;\n            while(col + this._cols * i < this.items.length){\n                let currVal:any = containerHeight[col % this._cols];\n                let newVal:any = this.items.toArray()[col + i * this._cols]?.height;\n                containerHeight[col % this._cols] = parseInt(currVal) + newVal;\n                i++;\n            }\n        }\n\n        this._element.nativeElement.style.height = `${Math.max(...containerHeight)}px`;\n    }\n\n    private translateElements(heights: Array<any>) {\n        this.items.forEach((child, index) => {\n            child.translateY = heights[index]; \n        });\n    }\n\n    ngAfterContentInit() {}\n    \n\n    ngOnDestroy() {\n        this.isAlive = false;\n        this.service.clearStack();\n    }\n    \n\n}\n"]}