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carbon/components/ImagePicker.js

336 lines
8.5 KiB
JavaScript

import React from 'react'
import ReactCrop, { makeAspectCrop } from 'react-image-crop'
import RandomImage from './RandomImage'
import PhotoCredit from './PhotoCredit'
import Input from './Input'
import { Link } from './Meta'
import { fileToDataURL } from '../lib/util'
import ApiContext from './ApiContext'
const getCroppedImg = (imageDataURL, pixelCrop) => {
const canvas = document.createElement('canvas')
canvas.width = pixelCrop.width
canvas.height = pixelCrop.height
const ctx = canvas.getContext('2d')
return new Promise(resolve => {
const image = new Image()
image.src = imageDataURL
image.onload = () => {
ctx.drawImage(
image,
pixelCrop.x,
pixelCrop.y,
pixelCrop.width,
pixelCrop.height,
0,
0,
pixelCrop.width,
pixelCrop.height
)
resolve(canvas.toDataURL('image/jpeg'))
}
})
}
const INITIAL_STATE = {
mode: 'file',
crop: null,
imageAspectRatio: null,
pixelCrop: null,
photographer: null,
dataURL: null
}
export default class ImagePicker extends React.Component {
static contextType = ApiContext
constructor(props) {
super(props)
this.state = INITIAL_STATE
this.selectMode = this.selectMode.bind(this)
this.handleURLInput = this.handleURLInput.bind(this)
this.uploadImage = this.uploadImage.bind(this)
this.selectImage = this.selectImage.bind(this)
this.removeImage = this.removeImage.bind(this)
this.onImageLoaded = this.onImageLoaded.bind(this)
this.onCropChange = this.onCropChange.bind(this)
this.onDragEnd = this.onDragEnd.bind(this)
}
static getDerivedStateFromProps(nextProps, state) {
if (state.crop) {
// update crop for editor container aspect-ratio change
return {
crop: makeAspectCrop(
{
...state.crop,
aspect: nextProps.aspectRatio
},
state.imageAspectRatio
)
}
}
return null
}
selectMode(mode) {
this.setState({ mode })
}
async onDragEnd() {
if (this.state.pixelCrop) {
const croppedImg = await getCroppedImg(this.state.dataURL, this.state.pixelCrop)
this.props.onChange({ backgroundImageSelection: croppedImg })
}
}
onCropChange(crop, pixelCrop) {
this.setState({
crop: { ...crop, aspect: this.props.aspectRatio },
pixelCrop
})
}
onImageLoaded(image) {
const imageAspectRatio = image.width / image.height
const initialCrop = {
x: 0,
y: 0,
width: 100,
aspect: this.props.aspectRatio
}
this.setState({
imageAspectRatio,
crop: makeAspectCrop(initialCrop, imageAspectRatio)
})
}
handleImageChange = (url, dataURL, photographer) => {
this.setState({ dataURL, photographer }, () => {
this.props.onChange({
backgroundImage: url,
backgroundImageSelection: null,
photographer
})
})
}
handleURLInput(e) {
e.preventDefault()
const url = e.target[0].value
return this.context
.downloadThumbnailImage({ url })
.then(res => res.dataURL)
.then(dataURL => this.handleImageChange(url, dataURL))
.catch(err => {
if (err.message.indexOf('Network Error') > -1) {
this.setState({
error:
'Fetching the image failed. This is probably a CORS-related issue. You can either enable CORS in your browser, or use another image.'
})
}
})
}
async uploadImage(e) {
const dataURL = await fileToDataURL(e.target.files[0])
return this.handleImageChange(dataURL, dataURL)
}
async selectImage(url, { photographer } = {}) {
// TODO use React suspense for loading this asset
const { dataURL } = await this.context.downloadThumbnailImage({ url })
return this.handleImageChange(url, dataURL, photographer)
}
removeImage() {
this.setState(INITIAL_STATE, () => {
this.props.onChange({
backgroundImage: null,
backgroundImageSelection: null
})
})
}
render() {
let content = (
<div>
<div className="choose-image">
<span>Upload a background image:</span>
<button
className={this.state.mode === 'file' ? 'active' : 'none'}
onClick={this.selectMode.bind(this, 'file')}
>
File
</button>
<button
className={this.state.mode === 'url' ? 'active' : 'none'}
onClick={this.selectMode.bind(this, 'url')}
>
URL
</button>
{this.state.mode === 'file' ? (
<Input
type="file"
accept="image/png,image/x-png,image/jpeg,image/jpg"
onChange={this.uploadImage}
/>
) : (
<form onSubmit={this.handleURLInput}>
<Input type="text" title="Background Image" placeholder="Image URL..." align="left" />
<button type="submit">Upload</button>
</form>
)}
{this.state.error && <span className="error">{this.state.error}</span>}
</div>
<hr />
<div className="random-image">
<span>
Or use a random <a href="https://unsplash.com/">Unsplash</a> image:
</span>
<RandomImage onChange={this.selectImage} />
</div>
<style jsx>
{`
button {
display: inline-block;
}
.choose-image,
.random-image {
padding: 8px;
}
.choose-image > button {
cursor: pointer;
color: white;
background: transparent;
border: none;
outline: none;
padding: 0;
margin: 0 8px 8px 0;
}
.choose-image > button:not(.active) {
opacity: 0.4;
}
.choose-image > button:focus {
text-decoration: underline;
}
form {
display: flex;
justify-content: space-between;
}
form > button {
padding: 1px 18px 2px 7px;
}
span {
display: block;
margin-bottom: 16px;
}
a {
text-decoration: underline;
}
hr {
border-bottom: none;
margin-bottom: 0;
margin-top: 0;
}
.error {
color: red;
margin-top: 8px;
}
`}
</style>
</div>
)
if (this.state.dataURL) {
content = (
<div className="settings-container">
<div className="image-container">
<div className="label">
<span>Background image</span>
<button onClick={this.removeImage}>&times;</button>
</div>
<ReactCrop
src={this.state.dataURL}
onImageLoaded={this.onImageLoaded}
crop={this.state.crop}
onChange={this.onCropChange}
onDragEnd={this.onDragEnd}
minHeight={10}
minWidth={10}
keepSelection
/>
{this.state.photographer && <PhotoCredit photographer={this.state.photographer} />}
</div>
<style jsx>
{`
button {
cursor: pointer;
color: inherit;
appearance: none;
border: none;
background: none;
display: block;
padding: 0;
margin: 0;
line-height: 16px;
}
.settings-container img {
width: 100%;
}
.label {
user-select: none;
margin-bottom: 4px;
}
:global(.ReactCrop__image) {
user-select: none;
user-drag: none;
}
.image-container {
padding: 8px;
}
.image-container .label {
display: flex;
justify-content: space-between;
align-items: center;
}
`}
</style>
</div>
)
}
return (
<div className="image-picker-container">
<Link href="/static/react-crop.css" />
{content}
<style jsx>
{`
.image-picker-container {
font-size: 12px;
}
`}
</style>
</div>
)
}
}