81 lines
2.1 KiB
TypeScript
81 lines
2.1 KiB
TypeScript
import React from 'react'
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import {Resizer} from './Resizer'
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import {readAsDataURL} from './Files'
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import {drawCanvasFromDataURL} from './Image'
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export interface IImage {
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dataURL: string
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}
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export interface IImageUploadProps {
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onChange: (images: IImage[]) => void
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multiple: boolean
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}
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export class ImageUpload extends React.PureComponent<IImageUploadProps> {
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fileInput: React.RefObject<HTMLInputElement>
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constructor(props: IImageUploadProps) {
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super(props)
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this.fileInput = React.createRef()
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}
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safeHandleChange = async (event: React.SyntheticEvent<HTMLInputElement>) => {
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try {
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await this.handleChange(event)
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} catch (err) {
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console.log('Error in handleChange', err)
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}
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}
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handleChange = async (event: React.SyntheticEvent<HTMLInputElement>) => {
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const self = this
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const files = Array.from(this.fileInput.current!.files!)
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const resized: IImage[] = []
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for (const file of files) {
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const dataURL = await readAsDataURL(file)
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const resizedDataURL = await this.resize(dataURL)
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resized.push({
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dataURL: resizedDataURL,
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})
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// TODO testing stuff
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const img = document.createElement('img')
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img.src = resizedDataURL
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this.fileInput.current!.parentElement!.appendChild(img)
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}
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(window as any).resized = resized
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this.props.onChange(resized)
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}
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async resize(dataURL: string): Promise<string> {
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const canvas = await drawCanvasFromDataURL(dataURL)
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const maxHeight = 512
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// // TODO figure out what to do when the image is really wide
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if (canvas.height > maxHeight) {
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const height = maxHeight
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const width = Math.round(canvas.width / canvas.height * maxHeight)
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await new Resizer().resample(canvas, width, height)
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}
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return canvas.toDataURL('image/jpeg', .85)
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}
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render() {
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return (
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<div className='image-upload'>
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<input
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autoComplete='off'
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multiple={this.props.multiple}
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type='file'
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accept='image/*'
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ref={this.fileInput}
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onChange={this.handleChange}
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/>
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</div>
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)
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}
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}
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