@offensichtbar-codestock/ngx-flex-masonry-grid
Version:
Angular Module for displaying items in a flex-based masonry layout without any third party dependencies
171 lines (169 loc) • 25.9 kB
JavaScript
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"]}