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92 lines
2.3 KiB
92 lines
2.3 KiB
import { target, targetable } from '@github/catalyst/lib/targetable'
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import { cropCanvasAndExportToPNG } from '../submission_form/crop_canvas'
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export default targetable(class extends HTMLElement {
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static [target.static] = ['canvas', 'input', 'clear', 'button']
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async connectedCallback () {
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const { default: SignaturePad } = await import('signature_pad')
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this.setCanvasSize()
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this.pad = new SignaturePad(this.canvas)
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this.resizeObserver = new ResizeObserver(() => {
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const { width, height } = this.canvas
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this.setCanvasSize()
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if (this.canvas.width !== width || this.canvas.height !== height) {
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this.redrawCanvas(width, height)
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}
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})
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this.resizeObserver.observe(this.canvas.parentNode)
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this.clear.addEventListener('click', (e) => {
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e.preventDefault()
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this.pad.clear()
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})
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this.button.addEventListener('click', (e) => {
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e.preventDefault()
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this.button.disabled = true
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this.submit()
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})
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}
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async submit () {
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const blob = await cropCanvasAndExportToPNG(this.canvas)
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const file = new File([blob], 'signature.png', { type: 'image/png' })
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const dataTransfer = new DataTransfer()
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dataTransfer.items.add(file)
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this.input.files = dataTransfer.files
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if (this.input.webkitEntries.length) {
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this.input.dataset.file = `${dataTransfer.files[0].name}`
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}
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this.closest('form').requestSubmit()
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}
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disconnectedCallback () {
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if (this.resizeObserver) {
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this.resizeObserver.disconnect()
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}
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}
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setCanvasSize () {
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const scale = 3
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const width = this.canvas.parentNode.clientWidth
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const height = this.canvas.parentNode.clientWidth / 2.5
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if (this.canvas.width !== width * scale || this.canvas.height !== height * scale) {
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this.canvas.width = width * scale
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this.canvas.height = height * scale
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this.canvas.getContext('2d').scale(scale, scale)
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}
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}
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redrawCanvas (oldWidth, oldHeight) {
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if (this.pad && !this.pad.isEmpty()) {
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const sx = this.canvas.width / oldWidth
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const sy = this.canvas.height / oldHeight
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const scaledData = this.pad.toData().map((stroke) => ({
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...stroke,
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points: stroke.points.map((p) => ({ ...p, x: p.x * sx, y: p.y * sy }))
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}))
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this.pad.fromData(scaledData)
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}
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}
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})
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