angular2-signaturepad
Version:
Angular2 Component wrapper for szimek / signature_pad
125 lines • 15.7 kB
JavaScript
import { Component, EventEmitter, Input, Output, } from '@angular/core';
import * as SignaturePadNative from 'signature_pad';
import * as i0 from "@angular/core";
export class SignaturePad {
constructor(elementRef) {
// no op
this.elementRef = elementRef;
this.options = this.options || {};
this.onBeginEvent = new EventEmitter();
this.onEndEvent = new EventEmitter();
}
ngAfterContentInit() {
const canvas = this.elementRef.nativeElement.querySelector('canvas');
if (this.options.canvasHeight) {
canvas.height = this.options.canvasHeight;
}
if (this.options.canvasWidth) {
canvas.width = this.options.canvasWidth;
}
this.signaturePad = new SignaturePadNative.default(canvas, this.options);
this.signaturePad.onBegin = this.onBegin.bind(this);
this.signaturePad.onEnd = this.onEnd.bind(this);
}
ngOnDestroy() {
const canvas = this.elementRef.nativeElement.querySelector('canvas');
canvas.width = 0;
canvas.height = 0;
}
resizeCanvas() {
// When zoomed out to less than 100%, for some very strange reason,
// some browsers report devicePixelRatio as less than 1
// and only part of the canvas is cleared then.
const ratio = Math.max(window.devicePixelRatio || 1, 1);
const canvas = this.signaturePad.canvas;
canvas.width = canvas.offsetWidth * ratio;
canvas.height = canvas.offsetHeight * ratio;
canvas.getContext('2d').scale(ratio, ratio);
this.signaturePad.clear(); // otherwise isEmpty() might return incorrect value
}
// Returns signature image as an array of point groups
toData() {
if (this.signaturePad) {
return this.signaturePad.toData();
}
else {
return [];
}
}
// Draws signature image from an array of point groups
fromData(points) {
this.signaturePad.fromData(points);
}
// Returns signature image as data URL (see https://mdn.io/todataurl for the list of possible paramters)
toDataURL(imageType, quality) {
return this.signaturePad.toDataURL(imageType, quality); // save image as data URL
}
// Draws signature image from data URL
fromDataURL(dataURL, options = {}) {
// set default height and width on read data from URL
if (!options.hasOwnProperty('height') &&
this.options.canvasHeight) {
options.height = this.options.canvasHeight;
}
if (!options.hasOwnProperty('width') && this.options.canvasWidth) {
options.width = this.options.canvasWidth;
}
this.signaturePad.fromDataURL(dataURL, options);
}
// Clears the canvas
clear() {
this.signaturePad.clear();
}
// Returns true if canvas is empty, otherwise returns false
isEmpty() {
return this.signaturePad.isEmpty();
}
// Unbinds all event handlers
off() {
this.signaturePad.off();
}
// Rebinds all event handlers
on() {
this.signaturePad.on();
}
// set an option on the signaturePad - e.g. set('minWidth', 50);
set(option, value) {
switch (option) {
case 'canvasHeight':
this.signaturePad.canvas.height = value;
break;
case 'canvasWidth':
this.signaturePad.canvas.width = value;
break;
default:
this.signaturePad[option] = value;
}
}
// notify subscribers on signature begin
onBegin() {
this.onBeginEvent.emit(true);
}
// notify subscribers on signature end
onEnd() {
this.onEndEvent.emit(true);
}
queryPad() {
return this.signaturePad;
}
}
SignaturePad.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.0.2", ngImport: i0, type: SignaturePad, deps: [{ token: i0.ElementRef }], target: i0.ɵɵFactoryTarget.Component });
SignaturePad.ɵcmp = i0.ɵɵngDeclareComponent({ minVersion: "12.0.0", version: "13.0.2", type: SignaturePad, selector: "signature-pad", inputs: { options: "options" }, outputs: { onBeginEvent: "onBeginEvent", onEndEvent: "onEndEvent" }, ngImport: i0, template: '<canvas></canvas>', isInline: true });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.0.2", ngImport: i0, type: SignaturePad, decorators: [{
type: Component,
args: [{
template: '<canvas></canvas>',
selector: 'signature-pad',
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }]; }, propDecorators: { options: [{
type: Input
}], onBeginEvent: [{
type: Output
}], onEndEvent: [{
type: Output
}] } });
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{\n  AfterContentInit,\n  Component,\n  ElementRef,\n  EventEmitter,\n  Input,\n  Output,\n  OnDestroy,\n} from '@angular/core';\n\nimport * as SignaturePadNative from 'signature_pad';\n\nexport interface Point {\n  x: number;\n  y: number;\n  time: number;\n}\n\nexport type PointGroup = Array<Point>;\n\n@Component({\n  template: '<canvas></canvas>',\n  selector: 'signature-pad',\n})\nexport class SignaturePad implements AfterContentInit, OnDestroy {\n  @Input() public options: any;\n  @Output() public onBeginEvent: EventEmitter<boolean>;\n  @Output() public onEndEvent: EventEmitter<boolean>;\n\n  private signaturePad: any;\n  private elementRef: ElementRef;\n\n  constructor(elementRef: ElementRef) {\n    // no op\n    this.elementRef = elementRef;\n    this.options = this.options || {};\n    this.onBeginEvent = new EventEmitter();\n    this.onEndEvent = new EventEmitter();\n  }\n\n  public ngAfterContentInit(): void {\n    const canvas: any = this.elementRef.nativeElement.querySelector('canvas');\n\n    if ((this.options as any).canvasHeight) {\n      canvas.height = (this.options as any).canvasHeight;\n    }\n\n    if ((this.options as any).canvasWidth) {\n      canvas.width = (this.options as any).canvasWidth;\n    }\n\n    this.signaturePad = new SignaturePadNative.default(canvas, this.options);\n    this.signaturePad.onBegin = this.onBegin.bind(this);\n    this.signaturePad.onEnd = this.onEnd.bind(this);\n  }\n\n  public ngOnDestroy(): void {\n    const canvas: any = this.elementRef.nativeElement.querySelector('canvas');\n    canvas.width = 0;\n    canvas.height = 0;\n  }\n\n  public resizeCanvas(): void {\n    // When zoomed out to less than 100%, for some very strange reason,\n    // some browsers report devicePixelRatio as less than 1\n    // and only part of the canvas is cleared then.\n    const ratio: number = Math.max(window.devicePixelRatio || 1, 1);\n    const canvas: any = this.signaturePad.canvas;\n    canvas.width = canvas.offsetWidth * ratio;\n    canvas.height = canvas.offsetHeight * ratio;\n    canvas.getContext('2d').scale(ratio, ratio);\n    this.signaturePad.clear(); // otherwise isEmpty() might return incorrect value\n  }\n\n  // Returns signature image as an array of point groups\n  public toData(): Array<PointGroup> {\n    if (this.signaturePad) {\n      return this.signaturePad.toData();\n    } else {\n      return [];\n    }\n  }\n\n  // Draws signature image from an array of point groups\n  public fromData(points: Array<PointGroup>): void {\n    this.signaturePad.fromData(points as any);\n  }\n\n  // Returns signature image as data URL (see https://mdn.io/todataurl for the list of possible paramters)\n  public toDataURL(imageType?: string, quality?: number): string {\n    return this.signaturePad.toDataURL(imageType, quality); // save image as data URL\n  }\n\n  // Draws signature image from data URL\n  public fromDataURL(dataURL: string, options: any = {}): void {\n    // set default height and width on read data from URL\n    if (\n      !options.hasOwnProperty('height') &&\n      (this.options as any).canvasHeight\n    ) {\n      options.height = (this.options as any).canvasHeight;\n    }\n    if (!options.hasOwnProperty('width') && (this.options as any).canvasWidth) {\n      options.width = (this.options as any).canvasWidth;\n    }\n    this.signaturePad.fromDataURL(dataURL, options);\n  }\n\n  // Clears the canvas\n  public clear(): void {\n    this.signaturePad.clear();\n  }\n\n  // Returns true if canvas is empty, otherwise returns false\n  public isEmpty(): boolean {\n    return this.signaturePad.isEmpty();\n  }\n\n  // Unbinds all event handlers\n  public off(): void {\n    this.signaturePad.off();\n  }\n\n  // Rebinds all event handlers\n  public on(): void {\n    this.signaturePad.on();\n  }\n\n  // set an option on the signaturePad - e.g. set('minWidth', 50);\n  public set(option: string, value: any): void {\n    switch (option) {\n      case 'canvasHeight':\n        this.signaturePad.canvas.height = value;\n        break;\n      case 'canvasWidth':\n        this.signaturePad.canvas.width = value;\n        break;\n      default:\n        this.signaturePad[option] = value;\n    }\n  }\n\n  // notify subscribers on signature begin\n  public onBegin(): void {\n    this.onBeginEvent.emit(true);\n  }\n\n  // notify subscribers on signature end\n  public onEnd(): void {\n    this.onEndEvent.emit(true);\n  }\n\n  public queryPad(): any {\n    return this.signaturePad;\n  }\n}\n"]}