ng-zorro-antd
Version:
An enterprise-class UI components based on Ant Design and Angular
181 lines • 20.7 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 { __decorate } from "tslib";
import { ChangeDetectionStrategy, ChangeDetectorRef, Component, Input, ViewChild, ViewEncapsulation } from '@angular/core';
import { Subject } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
import { NzConfigService, WithConfig } from 'ng-zorro-antd/core/config';
import { warn } from 'ng-zorro-antd/core/logger';
import { ImagePreloadService } from 'ng-zorro-antd/core/services';
import { InputBoolean } from 'ng-zorro-antd/core/util';
import { defaultImageSrcLoader } from './image-loader';
import { isFixedSize } from './utils';
export const NZ_CONFIG_MODULE_NAME = 'imageExperimental';
const sizeBreakpoints = [16, 32, 48, 64, 96, 128, 256, 384, 640, 750, 828, 1080, 1200, 1920, 2048, 3840];
export class NzImageViewComponent {
constructor(cdr, nzConfigService, imagePreloadService) {
this.cdr = cdr;
this.nzConfigService = nzConfigService;
this.imagePreloadService = imagePreloadService;
this._nzModuleName = NZ_CONFIG_MODULE_NAME;
this.nzSrc = '';
this.nzAlt = '';
this.nzWidth = 'auto';
this.nzHeight = 'auto';
this.nzSrcLoader = defaultImageSrcLoader;
this.nzAutoSrcset = false;
this.nzPriority = false;
this.nzFallback = null;
this.nzPlaceholder = null;
this.nzDisablePreview = false;
this.src = '';
this.width = 'auto';
this.height = 'auto';
this.srcset = '';
this.destroy$ = new Subject();
this.reloadDisposeHandler = () => void 0;
this.nzConfigService
.getConfigChangeEventForComponent(NZ_CONFIG_MODULE_NAME)
.pipe(takeUntil(this.destroy$))
.subscribe(() => {
this.composeImageAttrs();
this.cdr.markForCheck();
});
}
ngOnInit() {
if (this.nzPriority) {
this.preload();
}
}
ngOnChanges(changes) {
const { nzLoader, nzSrc, nzOptimize } = changes;
if (nzSrc || nzLoader || nzOptimize) {
this.composeImageAttrs();
}
}
ngOnDestroy() {
this.reloadDisposeHandler();
this.destroy$.next();
this.destroy$.complete();
}
preload() {
this.reloadDisposeHandler = this.imagePreloadService.addPreload({
src: this.src,
srcset: this.srcset
});
}
optimizable() {
if (this.nzAutoSrcset) {
if (!isFixedSize(this.nzWidth) || !isFixedSize(this.nzHeight)) {
warn(`When using "nzAutoSrcset" you should use a fixed size width and height, for more information please refer to CLS (https://web.dev/cls/) performance metrics`);
return false;
}
if (this.nzSrc.endsWith('.svg')) {
warn(`SVG does not need to be optimized`);
return false;
}
if (this.nzSrc.startsWith('data:')) {
warn(`Data URLs cannot be optimized`);
return false;
}
return true;
}
return false;
}
composeImageAttrs() {
const loader = this.getLoader();
if (!this.optimizable()) {
this.src = loader({ src: this.nzSrc });
this.width = this.nzWidth;
this.height = this.nzHeight;
return;
}
this.width = typeof this.nzWidth === 'number' ? this.nzWidth : parseInt(this.nzWidth, 10);
this.height = typeof this.nzHeight === 'number' ? this.nzHeight : parseInt(this.nzHeight, 10);
const widths = this.convertWidths(this.width, sizeBreakpoints);
this.src = loader({ src: this.nzSrc, width: widths[0] });
this.srcset = widths
.map((w, i) => `${loader({
src: this.nzSrc,
width: w
})} ${i + 1}x`)
.join(', ');
}
getLoader() {
return this.nzSrcLoader || defaultImageSrcLoader;
}
convertWidths(width, optimizeSizes) {
const allSizes = [...optimizeSizes].sort((a, b) => a - b);
return [
...new Set(
// 2x scale is sufficient
// https://blog.twitter.com/engineering/en_us/topics/infrastructure/2019/capping-image-fidelity-on-ultra-high-resolution-devices.html
[width, width * 2].map(w => allSizes.find(p => p >= w) || w))
];
}
}
NzImageViewComponent.decorators = [
{ type: Component, args: [{
selector: 'nz-image',
exportAs: 'nzImage',
template: `
<img
#imageRef
nz-image
[nzSrc]="src"
[nzSrcset]="srcset"
[nzDisablePreview]="nzDisablePreview"
[nzFallback]="nzFallback"
[nzPlaceholder]="nzPlaceholder"
[attr.width]="width"
[attr.height]="height"
[attr.srcset]="srcset"
[attr.alt]="nzAlt || null"
/>
`,
preserveWhitespaces: false,
changeDetection: ChangeDetectionStrategy.OnPush,
encapsulation: ViewEncapsulation.None
},] }
];
NzImageViewComponent.ctorParameters = () => [
{ type: ChangeDetectorRef },
{ type: NzConfigService },
{ type: ImagePreloadService }
];
NzImageViewComponent.propDecorators = {
nzSrc: [{ type: Input }],
nzAlt: [{ type: Input }],
nzWidth: [{ type: Input }],
nzHeight: [{ type: Input }],
nzSrcLoader: [{ type: Input }],
nzAutoSrcset: [{ type: Input }],
nzPriority: [{ type: Input }],
nzFallback: [{ type: Input }],
nzPlaceholder: [{ type: Input }],
nzDisablePreview: [{ type: Input }],
imageRef: [{ type: ViewChild, args: ['imageRef',] }]
};
__decorate([
WithConfig()
], NzImageViewComponent.prototype, "nzSrcLoader", void 0);
__decorate([
InputBoolean(),
WithConfig()
], NzImageViewComponent.prototype, "nzAutoSrcset", void 0);
__decorate([
InputBoolean()
], NzImageViewComponent.prototype, "nzPriority", void 0);
__decorate([
WithConfig()
], NzImageViewComponent.prototype, "nzFallback", void 0);
__decorate([
WithConfig()
], NzImageViewComponent.prototype, "nzPlaceholder", void 0);
__decorate([
InputBoolean(),
WithConfig()
], NzImageViewComponent.prototype, "nzDisablePreview", void 0);
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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 {\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ElementRef,\n  Input,\n  OnChanges,\n  OnDestroy,\n  OnInit,\n  SimpleChanges,\n  ViewChild,\n  ViewEncapsulation\n} from '@angular/core';\nimport { Subject } from 'rxjs';\nimport { takeUntil } from 'rxjs/operators';\n\nimport { NzConfigKey, NzConfigService, WithConfig } from 'ng-zorro-antd/core/config';\nimport { warn } from 'ng-zorro-antd/core/logger';\nimport { ImagePreloadService, PreloadDisposeHandle } from 'ng-zorro-antd/core/services';\nimport { BooleanInput } from 'ng-zorro-antd/core/types';\nimport { InputBoolean } from 'ng-zorro-antd/core/util';\n\nimport { defaultImageSrcLoader } from './image-loader';\nimport { NzImageSrcLoader } from './typings';\nimport { isFixedSize } from './utils';\n\nexport const NZ_CONFIG_MODULE_NAME: NzConfigKey = 'imageExperimental';\nconst sizeBreakpoints = [16, 32, 48, 64, 96, 128, 256, 384, 640, 750, 828, 1080, 1200, 1920, 2048, 3840];\n\n@Component({\n  selector: 'nz-image',\n  exportAs: 'nzImage',\n  template: `\n    <img\n      #imageRef\n      nz-image\n      [nzSrc]=\"src\"\n      [nzSrcset]=\"srcset\"\n      [nzDisablePreview]=\"nzDisablePreview\"\n      [nzFallback]=\"nzFallback\"\n      [nzPlaceholder]=\"nzPlaceholder\"\n      [attr.width]=\"width\"\n      [attr.height]=\"height\"\n      [attr.srcset]=\"srcset\"\n      [attr.alt]=\"nzAlt || null\"\n    />\n  `,\n  preserveWhitespaces: false,\n  changeDetection: ChangeDetectionStrategy.OnPush,\n  encapsulation: ViewEncapsulation.None\n})\nexport class NzImageViewComponent implements OnInit, OnChanges, OnDestroy {\n  readonly _nzModuleName: NzConfigKey = NZ_CONFIG_MODULE_NAME;\n  static ngAcceptInputType_nzAutoSrcset: BooleanInput;\n  static ngAcceptInputType_nzPriority: BooleanInput;\n  static ngAcceptInputType_nzDisablePreview: BooleanInput;\n\n  @Input() nzSrc: string = '';\n  @Input() nzAlt: string = '';\n  @Input() nzWidth: string | number = 'auto';\n  @Input() nzHeight: string | number = 'auto';\n  @Input() @WithConfig() nzSrcLoader: NzImageSrcLoader = defaultImageSrcLoader;\n  @Input() @InputBoolean() @WithConfig() nzAutoSrcset: boolean = false;\n  @Input() @InputBoolean() nzPriority: boolean = false;\n  @Input() @WithConfig() nzFallback: string | null = null;\n  @Input() @WithConfig() nzPlaceholder: string | null = null;\n  @Input() @InputBoolean() @WithConfig() nzDisablePreview: boolean = false;\n  @ViewChild('imageRef') imageRef!: ElementRef<HTMLImageElement>;\n\n  src = '';\n\n  width: string | number = 'auto';\n  height: string | number = 'auto';\n  srcset = '';\n  internalImage!: HTMLImageElement;\n\n  private destroy$ = new Subject<void>();\n  private reloadDisposeHandler: PreloadDisposeHandle = () => void 0;\n\n  constructor(\n    private cdr: ChangeDetectorRef,\n    public nzConfigService: NzConfigService,\n    private imagePreloadService: ImagePreloadService\n  ) {\n    this.nzConfigService\n      .getConfigChangeEventForComponent(NZ_CONFIG_MODULE_NAME)\n      .pipe(takeUntil(this.destroy$))\n      .subscribe(() => {\n        this.composeImageAttrs();\n        this.cdr.markForCheck();\n      });\n  }\n\n  ngOnInit(): void {\n    if (this.nzPriority) {\n      this.preload();\n    }\n  }\n\n  ngOnChanges(changes: SimpleChanges): void {\n    const { nzLoader, nzSrc, nzOptimize } = changes;\n\n    if (nzSrc || nzLoader || nzOptimize) {\n      this.composeImageAttrs();\n    }\n  }\n\n  ngOnDestroy(): void {\n    this.reloadDisposeHandler();\n    this.destroy$.next();\n    this.destroy$.complete();\n  }\n\n  private preload(): void {\n    this.reloadDisposeHandler = this.imagePreloadService.addPreload({\n      src: this.src,\n      srcset: this.srcset\n    });\n  }\n\n  private optimizable(): boolean {\n    if (this.nzAutoSrcset) {\n      if (!isFixedSize(this.nzWidth) || !isFixedSize(this.nzHeight)) {\n        warn(\n          `When using \"nzAutoSrcset\" you should use a fixed size width and height, for more information please refer to CLS (https://web.dev/cls/) performance metrics`\n        );\n        return false;\n      }\n      if (this.nzSrc.endsWith('.svg')) {\n        warn(`SVG does not need to be optimized`);\n        return false;\n      }\n      if (this.nzSrc.startsWith('data:')) {\n        warn(`Data URLs cannot be optimized`);\n        return false;\n      }\n      return true;\n    }\n    return false;\n  }\n\n  private composeImageAttrs(): void {\n    const loader = this.getLoader();\n    if (!this.optimizable()) {\n      this.src = loader({ src: this.nzSrc });\n      this.width = this.nzWidth;\n      this.height = this.nzHeight;\n      return;\n    }\n    this.width = typeof this.nzWidth === 'number' ? this.nzWidth : parseInt(this.nzWidth, 10);\n    this.height = typeof this.nzHeight === 'number' ? this.nzHeight : parseInt(this.nzHeight, 10);\n    const widths = this.convertWidths(this.width, sizeBreakpoints);\n    this.src = loader({ src: this.nzSrc, width: widths[0] });\n    this.srcset = widths\n      .map(\n        (w, i) =>\n          `${loader({\n            src: this.nzSrc,\n            width: w\n          })} ${i + 1}x`\n      )\n      .join(', ');\n  }\n\n  private getLoader(): NzImageSrcLoader {\n    return this.nzSrcLoader || defaultImageSrcLoader;\n  }\n\n  private convertWidths(width: number, optimizeSizes: number[]): number[] {\n    const allSizes = [...optimizeSizes].sort((a, b) => a - b);\n    return [\n      ...new Set(\n        // 2x scale is sufficient\n        // https://blog.twitter.com/engineering/en_us/topics/infrastructure/2019/capping-image-fidelity-on-ultra-high-resolution-devices.html\n        [width, width * 2].map(w => allSizes.find(p => p >= w) || w)\n      )\n    ];\n  }\n}\n"]}