ngx-extended-pdf-viewer
Version:
Embedding PDF files in your Angular application. Highly configurable viewer including the toolbar, sidebar, and all the features you're used to.
115 lines • 19.5 kB
JavaScript
export class PinchOnMobileSupport {
constructor(_zone) {
this._zone = _zone;
this.startX = 0;
this.startY = 0;
this.initialPinchDistance = 0;
this.pinchScale = 1;
this.boundOnViewerTouchStart = this.onViewerTouchStart.bind(this);
this.boundOnViewerTouchMove = this.onViewerTouchMove.bind(this);
this.boundOnViewerTouchEnd = this.onViewerTouchEnd.bind(this);
this.initializePinchZoom();
}
isMobile() {
return 'ontouchstart' in document.documentElement;
}
onViewerTouchStart(event) {
this.initialPinchDistance = 0;
if (event.touches.length === 2) {
const container = document.getElementById('viewerContainer');
const rect = container.getBoundingClientRect();
if (event.touches[0].pageX >= rect.left && event.touches[0].pageX <= rect.right) {
if (event.touches[0].pageY >= (rect.top + window.scrollY) && event.touches[0].pageY <= (rect.bottom + window.scrollY)) {
if (event.touches[1].pageX >= rect.left && event.touches[1].pageX <= rect.right) {
if (event.touches[1].pageY >= (rect.top + window.scrollY) && event.touches[1].pageY <= (rect.bottom + window.scrollY)) {
this.startX = (event.touches[0].pageX + event.touches[1].pageX) / 2;
this.startY = (event.touches[0].pageY + event.touches[1].pageY) / 2;
this.initialPinchDistance = Math.hypot(event.touches[1].pageX - event.touches[0].pageX, event.touches[1].pageY - event.touches[0].pageY);
if (event.cancelable) {
event.preventDefault();
}
event.stopPropagation();
}
}
}
}
}
}
onViewerTouchMove(event) {
const PDFViewerApplicationOptions = window.PDFViewerApplicationOptions;
const PDFViewerApplication = window.PDFViewerApplication;
if (this.initialPinchDistance <= 0 || event.touches.length !== 2) {
return;
}
const pinchDistance = Math.hypot(event.touches[1].pageX - event.touches[0].pageX, event.touches[1].pageY - event.touches[0].pageY);
const container = document.getElementById('viewerContainer');
const originX = this.startX + container.scrollLeft;
const originY = this.startY + container.scrollTop;
this.pinchScale = pinchDistance / this.initialPinchDistance;
let minZoom = Number(PDFViewerApplicationOptions.get('minZoom'));
if (!minZoom) {
minZoom = 0.1;
}
const currentZoom = PDFViewerApplication.pdfViewer._currentScale;
if (currentZoom * this.pinchScale < minZoom) {
this.pinchScale = minZoom / currentZoom;
}
let maxZoom = Number(PDFViewerApplicationOptions.get('maxZoom'));
if (!maxZoom) {
maxZoom = 10;
}
if (currentZoom * this.pinchScale > maxZoom) {
this.pinchScale = maxZoom / currentZoom;
}
this.viewer.style.transform = `scale(${this.pinchScale})`;
this.viewer.style.transformOrigin = `${originX}px ${originY}px`;
if (event.cancelable) {
event.preventDefault();
}
event.stopPropagation();
}
onViewerTouchEnd(event) {
const PDFViewerApplication = window.PDFViewerApplication;
if (this.initialPinchDistance <= 0) {
return;
}
this.viewer.style.transform = `none`;
this.viewer.style.transformOrigin = `unset`;
PDFViewerApplication.pdfViewer.currentScale *= this.pinchScale;
const container = document.getElementById('viewerContainer');
const rect = container.getBoundingClientRect();
const dx = this.startX - rect.left;
const dy = this.startY - rect.top;
container.scrollLeft += dx * (this.pinchScale - 1);
container.scrollTop += dy * (this.pinchScale - 1);
this.resetPinchZoomParams();
if (event.cancelable) {
event.preventDefault();
}
event.stopPropagation();
}
resetPinchZoomParams() {
this.startX = this.startY = this.initialPinchDistance = 0;
this.pinchScale = 1;
}
initializePinchZoom() {
if (!this.isMobile()) {
return;
}
this.viewer = document.getElementById('viewer');
this._zone.runOutsideAngular(() => {
document.addEventListener('touchstart', this.boundOnViewerTouchStart);
document.addEventListener('touchmove', this.boundOnViewerTouchMove, { passive: false });
document.addEventListener('touchend', this.boundOnViewerTouchEnd);
});
}
destroyPinchZoom() {
if (!this.isMobile()) {
return;
}
document.removeEventListener('touchstart', this.boundOnViewerTouchStart);
document.removeEventListener('touchmove', this.boundOnViewerTouchMove);
document.removeEventListener('touchend', this.boundOnViewerTouchEnd);
}
}
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{ NgZone } from '@angular/core';\nimport { IPDFViewerApplicationOptions } from './options/pdf-viewer-application-options';\n\nexport class PinchOnMobileSupport {\n  private viewer: any;\n  private startX = 0;\n  private startY = 0;\n  private initialPinchDistance = 0;\n  private pinchScale = 1;\n\n  private boundOnViewerTouchStart: any;\n  private boundOnViewerTouchMove: any;\n  private boundOnViewerTouchEnd: any;\n\n  constructor(private _zone: NgZone) {\n    this.boundOnViewerTouchStart = this.onViewerTouchStart.bind(this);\n    this.boundOnViewerTouchMove = this.onViewerTouchMove.bind(this);\n    this.boundOnViewerTouchEnd = this.onViewerTouchEnd.bind(this);\n\n    this.initializePinchZoom();\n  }\n\n  private isMobile() {\n    return 'ontouchstart' in document.documentElement;\n  }\n\n  private onViewerTouchStart(event: TouchEvent): void {\n    this.initialPinchDistance = 0;\n\n    if (event.touches.length === 2) {\n      const container = document.getElementById('viewerContainer') as HTMLDivElement;\n      const rect = container.getBoundingClientRect();\n      if (event.touches[0].pageX >= rect.left && event.touches[0].pageX <= rect.right) {\n        if (event.touches[0].pageY >= (rect.top + window.scrollY) && event.touches[0].pageY <= (rect.bottom + window.scrollY)) {\n          if (event.touches[1].pageX >= rect.left && event.touches[1].pageX <= rect.right) {\n            if (event.touches[1].pageY >= (rect.top + window.scrollY) && event.touches[1].pageY <= (rect.bottom + window.scrollY)) {\n              this.startX = (event.touches[0].pageX + event.touches[1].pageX) / 2;\n              this.startY = (event.touches[0].pageY + event.touches[1].pageY) / 2;\n              this.initialPinchDistance = Math.hypot(event.touches[1].pageX - event.touches[0].pageX, event.touches[1].pageY - event.touches[0].pageY);\n              \n              if (event.cancelable) {\n                event.preventDefault();\n              }\n              event.stopPropagation();\n            }\n          }\n        }\n      }\n    }\n  }\n\n  private onViewerTouchMove(event: TouchEvent): void {\n    const PDFViewerApplicationOptions: IPDFViewerApplicationOptions = (window as any).PDFViewerApplicationOptions;\n    const PDFViewerApplication: any = (window as any).PDFViewerApplication;\n\n    if (this.initialPinchDistance <= 0 || event.touches.length !== 2) {\n      return;\n    }\n\n    const pinchDistance = Math.hypot(event.touches[1].pageX - event.touches[0].pageX, event.touches[1].pageY - event.touches[0].pageY);\n    const container = document.getElementById('viewerContainer') as HTMLDivElement;\n    const originX = this.startX + container.scrollLeft;\n    const originY = this.startY + container.scrollTop;\n    this.pinchScale = pinchDistance / this.initialPinchDistance;\n    let minZoom = Number(PDFViewerApplicationOptions.get('minZoom'));\n    if (!minZoom) {\n      minZoom = 0.1;\n    }\n\n    const currentZoom = PDFViewerApplication.pdfViewer._currentScale;\n    if (currentZoom * this.pinchScale < minZoom) {\n      this.pinchScale = minZoom / currentZoom;\n    }\n    let maxZoom = Number(PDFViewerApplicationOptions.get('maxZoom'));\n    if (!maxZoom) {\n      maxZoom = 10;\n    }\n    if (currentZoom * this.pinchScale > maxZoom) {\n      this.pinchScale = maxZoom / currentZoom;\n    }\n    this.viewer.style.transform = `scale(${this.pinchScale})`;\n    this.viewer.style.transformOrigin = `${originX}px ${originY}px`;\n    \n    if (event.cancelable) {\n      event.preventDefault();\n    }\n    event.stopPropagation();\n  }\n\n  private onViewerTouchEnd(event: TouchEvent): void {\n    const PDFViewerApplication: any = (window as any).PDFViewerApplication;\n    if (this.initialPinchDistance <= 0) {\n      return;\n    }\n    this.viewer.style.transform = `none`;\n    this.viewer.style.transformOrigin = `unset`;\n    PDFViewerApplication.pdfViewer.currentScale *= this.pinchScale;\n    const container = document.getElementById('viewerContainer') as HTMLDivElement;\n    const rect = container.getBoundingClientRect();\n    const dx = this.startX - rect.left;\n    const dy = this.startY - rect.top;\n    container.scrollLeft += dx * (this.pinchScale - 1);\n    container.scrollTop += dy * (this.pinchScale - 1);\n    this.resetPinchZoomParams();\n\n    if (event.cancelable) {\n      event.preventDefault();\n    }\n    event.stopPropagation();\n  }\n\n  private resetPinchZoomParams(): void {\n    this.startX = this.startY = this.initialPinchDistance = 0;\n    this.pinchScale = 1;\n  }\n\n  public initializePinchZoom(): void {\n    if (!this.isMobile()) {\n      return;\n    }\n    this.viewer = document.getElementById('viewer');\n    this._zone.runOutsideAngular(() => {\n      document.addEventListener('touchstart', this.boundOnViewerTouchStart);\n      document.addEventListener('touchmove', this.boundOnViewerTouchMove, { passive: false });\n      document.addEventListener('touchend', this.boundOnViewerTouchEnd);\n    });\n  }\n\n  public destroyPinchZoom(): void {\n    if (!this.isMobile()) {\n      return;\n    }\n    document.removeEventListener('touchstart', this.boundOnViewerTouchStart);\n    document.removeEventListener('touchmove', this.boundOnViewerTouchMove);\n    document.removeEventListener('touchend', this.boundOnViewerTouchEnd);\n  }\n}\n"]}