mirror of
https://github.com/Alfresco/alfresco-ng2-components.git
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1266acc4ab
* [ADF-2438] calculate thumbnail height * [ADF-2438] send height to parent element * [ADF-2438] add width to css * [ADF-2438] moved height and width logic to parent component * [ADF-2438] added height and width logic to parent component * [ADF-2438] fixed failing test
63 lines
2.0 KiB
TypeScript
63 lines
2.0 KiB
TypeScript
/*!
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* @license
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* Copyright 2016 Alfresco Software, Ltd.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { Component, Input, OnInit, ViewEncapsulation } from '@angular/core';
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import { DomSanitizer } from '@angular/platform-browser';
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@Component({
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selector: 'adf-pdf-thumb',
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templateUrl: './pdfViewer-thumb.component.html',
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encapsulation: ViewEncapsulation.None
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})
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export class PdfThumbComponent implements OnInit {
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@Input()
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page: any = null;
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image$: Promise<string>;
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constructor(private sanitizer: DomSanitizer) {}
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ngOnInit() {
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this.image$ = this.page.getPage().then((page) => this.getThumb(page));
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}
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private getThumb(page): Promise<string> {
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const viewport = page.getViewport(1);
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const pageRatio = viewport.width / viewport.height;
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const canvas = this.getCanvas(pageRatio);
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const scale = Math.min((canvas.height / viewport.height), (canvas.width / viewport.width));
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return page.render({
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canvasContext: canvas.getContext('2d'),
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viewport: page.getViewport(scale)
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})
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.then(() => {
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const imageSource = canvas.toDataURL();
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return this.sanitizer.bypassSecurityTrustUrl(imageSource);
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});
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}
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private getCanvas(pageRatio): HTMLCanvasElement {
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const canvas = document.createElement('canvas');
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canvas.width = this.page.getWidth();
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canvas.height = this.page.getHeight();
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return canvas;
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}
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}
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