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import { observable, computed, action } from "mobx"
import { observer } from "mobx-react"
import { Bounds, DEFAULT_BOUNDS } from "../../clientUtils/Bounds"
import { LoadingIndicator } from "../loadingIndicator/LoadingIndicator"
import { FontAwesomeIcon } from "@fortawesome/react-fontawesome"
import { faDownload } from "@fortawesome/free-solid-svg-icons/faDownload"
import { faInfoCircle } from "@fortawesome/free-solid-svg-icons/faInfoCircle"
import { BlankOwidTable, OwidTable } from "../../coreTable/OwidTable"
import {
triggerDownloadFromBlob,
triggerDownloadFromUrl,
} from "../../clientUtils/Util"
import { OwidColumnDef } from "../../coreTable/OwidTableConstants"
import { CoreColumn } from "../../coreTable/CoreTableColumns"
export interface DownloadTabManager {
idealBounds?: Bounds
staticSVG: string
displaySlug: string
baseUrl?: string
queryStr?: string
table?: OwidTable
externalCsvLink?: string // Todo: we can ditch this once rootTable === externalCsv (currently not quite the case for Covid Explorer)
}
interface DownloadTabProps {
bounds?: Bounds
manager: DownloadTabManager
}
const polyfillToBlob = (): void => {
// https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toBlob#Polyfill
Object.defineProperty(HTMLCanvasElement.prototype, "toBlob", {
value: function (
callback: (blob: Blob) => void,
type: string,
quality: any
) {
const binStr = atob(
(this as HTMLCanvasElement)
.toDataURL(type, quality)
.split(",")[1]
)
const len = binStr.length
const arr = new Uint8Array(len)
for (let i = 0; i < len; i++) {
arr[i] = binStr.charCodeAt(i)
}
callback(new Blob([arr], { type: type || "image/png" }))
},
})
}
@observer
export class DownloadTab extends React.Component<DownloadTabProps> {
@computed private get idealBounds(): Bounds {
return this.manager.idealBounds ?? DEFAULT_BOUNDS
}
@computed private get bounds(): Bounds {
return this.props.bounds ?? DEFAULT_BOUNDS
}
@computed private get targetWidth(): number {
return this.idealBounds.width
}
@computed private get targetHeight(): number {
return this.idealBounds.height
}
@computed private get manager(): DownloadTabManager {
return this.props.manager
}
@observable private svgBlob?: Blob
@observable private svgPreviewUrl?: string
@observable private pngBlob?: Blob
@observable private pngPreviewUrl?: string
@observable private isReady: boolean = false
@action.bound private export(): void {
if (!HTMLCanvasElement.prototype.toBlob) polyfillToBlob()
this.createSvg()
const reader = new FileReader()
reader.onload = (ev: any): void => {
this.svgPreviewUrl = ev.target.result as string
this.tryCreatePng(this.svgPreviewUrl)
}
reader.readAsDataURL(this.svgBlob as Blob)
}
@action.bound private createSvg(): void {
const staticSVG = this.manager.staticSVG
this.svgBlob = new Blob([staticSVG], {
type: "image/svg+xml;charset=utf-8",
})
}
@action.bound private tryCreatePng(svgPreviewUrl: string): void {
const { targetWidth, targetHeight } = this
// Client-side SVG => PNG export. Somewhat experimental, so there's a lot of cross-browser fiddling and fallbacks here.
const img = new Image()
img.onload = (): void => {
try {
const canvas = document.createElement("canvas")
// We draw the chart at 4x res then scale it down again -- much better text quality
canvas.width = targetWidth * 4
canvas.height = targetHeight * 4
const ctx = canvas.getContext("2d", {
alpha: false,
}) as CanvasRenderingContext2D
ctx.imageSmoothingEnabled = false
ctx.setTransform(4, 0, 0, 4, 0, 0)
ctx.drawImage(img, 0, 0)
this.pngPreviewUrl = canvas.toDataURL("image/png")
canvas.toBlob((blob) => {
this.pngBlob = blob ?? undefined
this.markAsReady()
})
} catch (e) {
console.error(e)
this.markAsReady()
}
}
img.onerror = (err): void => {
console.error(JSON.stringify(err))
this.markAsReady()
}
img.src = svgPreviewUrl
}
@computed private get csvBlob(): Blob {
const csv = this.inputTable.toPrettyCsv()
return new Blob([csv], {
type: "text/csv;charset=utf-8",
})
}
@action.bound private markAsReady(): void {
this.isReady = true
}
@computed private get fallbackPngUrl(): string {
return `${this.manager.baseUrl || ""}.png${this.manager.queryStr || ""}`
}
@computed private get baseFilename(): string {
return this.manager.displaySlug
}
@computed private get inputTable(): OwidTable {
return this.manager.table ?? BlankOwidTable()
}
@computed private get nonRedistributableColumn(): CoreColumn | undefined {
return this.inputTable.columnsAsArray.find(
(col) => (col.def as OwidColumnDef).nonRedistributable
)
}
// Data downloads are fully disabled if _any_ variable used is non-redistributable.
// In the future, we would probably like to drop only the columns that are
// non-redistributable, and allow downloading the rest in the CSV.
// -@danielgavrilov, 2021-11-16
@computed private get nonRedistributable(): boolean {
return this.nonRedistributableColumn !== undefined
}
// There could be multiple non-redistributable variables in the chart.
// For now, we only pick the first one to populate the link.
// In the future, we may need to change the phrasing of the download
// notice and provide links to all publishers.
// -@danielgavrilov, 2021-11-16
@computed private get nonRedistributableSourceLink(): string | undefined {
const def = this.nonRedistributableColumn?.def as
| OwidColumnDef
| undefined
return def?.sourceLink
}
@action.bound private onPngDownload(): void {
const filename = this.baseFilename + ".png"
if (this.pngBlob) {
triggerDownloadFromBlob(filename, this.pngBlob)
} else {
triggerDownloadFromUrl(filename, this.fallbackPngUrl)
}
}
@action.bound private onSvgDownload(): void {
const filename = this.baseFilename + ".svg"
if (this.svgBlob) {
triggerDownloadFromBlob(filename, this.svgBlob)
}
}
@action.bound private onCsvDownload(): void {
const { manager, baseFilename } = this
const filename = baseFilename + ".csv"
if (manager.externalCsvLink) {
triggerDownloadFromUrl(filename, manager.externalCsvLink)
} else {
triggerDownloadFromBlob(filename, this.csvBlob)
}
}
private renderReady(): JSX.Element {
const { targetWidth, targetHeight, svgPreviewUrl, bounds } = this
const pngPreviewUrl = this.pngPreviewUrl || this.fallbackPngUrl
let previewWidth: number
let previewHeight: number
const boundScalar = 0.17
if (bounds.width / bounds.height > targetWidth / targetHeight) {
previewHeight = bounds.height * boundScalar
previewWidth = (targetWidth / targetHeight) * previewHeight
} else {
previewWidth = bounds.width * boundScalar
previewHeight = (targetHeight / targetWidth) * previewWidth
}
const imgStyle = {
minWidth: previewWidth,
minHeight: previewHeight,
maxWidth: previewWidth,
maxHeight: previewHeight,
}
return (
<div className="grouped-menu">
<div className="grouped-menu-section">
<h2>Chart</h2>
<div className="grouped-menu-list">
<button
className="grouped-menu-item"
onClick={this.onPngDownload}
data-track-note="chart-download-png"
>
<div className="grouped-menu-icon">
<img src={pngPreviewUrl} style={imgStyle} />
</div>
<div className="grouped-menu-content">
<h3 className="title">
Image <span className="faint">(PNG)</span>
</h3>
<p className="description">
Suitable for most uses, widely compatible.
</p>
</div>
<div className="grouped-menu-icon">
<span className="download-icon">
<FontAwesomeIcon icon={faDownload} />
</span>
</div>
</button>
<button
className="grouped-menu-item"
onClick={this.onSvgDownload}
data-track-note="chart-download-svg"
>
<div className="grouped-menu-icon">
<img src={svgPreviewUrl} style={imgStyle} />
</div>
<div className="grouped-menu-content">
<h3 className="title">
Vector graphic{" "}
<span className="faint">(SVG)</span>
</h3>
<p className="description">
For high quality prints, or further editing
the chart in graphics software.
</p>
</div>
<div className="grouped-menu-icon">
<span className="download-icon">
<FontAwesomeIcon icon={faDownload} />
</span>
</div>
</button>
</div>
</div>
<div className="grouped-menu-section">
<h2>Data</h2>
{this.nonRedistributable ? (
<div className="grouped-menu-callout danger">
<div className="grouped-menu-callout-icon">
<FontAwesomeIcon icon={faInfoCircle} />
</div>
<div className="grouped-menu-callout-content">
<h3 className="title">
The data in this chart is not available to
download
</h3>
<p>
The data is published under a license that
doesn't allow us to redistribute it.
</p>
{this.nonRedistributableSourceLink && (
<p>
Please visit the{" "}
<a
href={
this
.nonRedistributableSourceLink
}
>
<strong>
data publisher's website
</strong>
</a>{" "}
for more details.
</p>
)}
</div>
</div>
) : (
<div className="grouped-menu-list">
<button
className="grouped-menu-item"
onClick={this.onCsvDownload}
data-track-note="chart-download-csv"
>
<div className="grouped-menu-content">
<h3 className="title">
Full data{" "}
<span className="faint">(CSV)</span>
</h3>
<p className="description">
The full dataset used in this chart.
</p>
</div>
<div className="grouped-menu-icon">
<span className="download-icon">
<FontAwesomeIcon icon={faDownload} />
</span>
</div>
</button>
</div>
)}
</div>
</div>
)
}
componentDidMount(): void {
this.export()
}
render(): JSX.Element {
return (
<div
className="DownloadTab"
style={{ ...this.bounds.toCSS(), position: "absolute" }}
>
{this.isReady ? (
this.renderReady()
) : (
<LoadingIndicator color="#000" />
)}
</div>
)
}
}
|