/
withScreencast.tsx
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/
withScreencast.tsx
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/**
* @license
* Copyright 2018-2022 Streamlit Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { logWarning } from "src/lib/log"
import ScreenCastRecorder from "src/lib/ScreenCastRecorder"
import hoistNonReactStatics from "hoist-non-react-statics"
import React, { PureComponent, ComponentType, ReactNode } from "react"
import {
UnsupportedBrowserDialog,
ScreencastDialog,
VideoRecordedDialog,
} from "src/hocs/withScreencast/components"
import Countdown from "src/components/core/Countdown"
export type Steps =
| "UNSUPPORTED"
| "OFF"
| "SETUP"
| "COUNTDOWN"
| "RECORDING"
| "PREVIEW_FILE"
interface WithScreenCastProps {}
interface WithScreenCastState {
fileName: string
recordAudio: boolean
outputBlob?: Blob
currentState: Steps
}
export interface ScreenCastHOC {
currentState: Steps
toggleRecordAudio: () => void
startRecording: (fileName: string) => void
stopRecording: () => void
}
function withScreencast(
WrappedComponent: ComponentType<any>
): ComponentType<any> {
class ComponentWithScreencast extends PureComponent<
WithScreenCastProps,
WithScreenCastState
> {
static readonly displayName = `withScreencast(${WrappedComponent.displayName ||
WrappedComponent.name})`
recorder?: ScreenCastRecorder | null
state = {
fileName: "streamlit-screencast",
recordAudio: false,
currentState: "OFF" as Steps,
}
private toggleRecordAudio = (): void => {
const { recordAudio } = this.state
this.setState({
recordAudio: !recordAudio,
})
}
private showDialog = (fileName: string): void => {
const { currentState } = this.state
if (!ScreenCastRecorder.isSupportedBrowser()) {
this.setState({ currentState: "UNSUPPORTED" })
} else if (currentState === "OFF") {
this.setState({
fileName,
currentState: "SETUP",
})
} else {
this.stopRecording().catch(err =>
logWarning(`withScreencast.stopRecording threw an error: ${err}`)
)
}
}
public startRecording = async (): Promise<any> => {
const { recordAudio } = this.state
this.recorder = new ScreenCastRecorder({
recordAudio,
onErrorOrStop: () => this.stopRecording(),
})
try {
await this.recorder.initialize()
} catch (e) {
logWarning(`ScreenCastRecorder.initialize error: ${e}`)
this.setState({ currentState: "UNSUPPORTED" })
return
}
this.setState({ currentState: "COUNTDOWN" })
}
private stopRecording = async (): Promise<any> => {
let outputBlob
const { currentState } = this.state
// We should do nothing if the user try to stop recording when it is not started
if (currentState === "OFF" || this.recorder == null) {
return
}
if (currentState === "COUNTDOWN") {
this.setState({
currentState: "OFF",
})
}
if (currentState === "RECORDING") {
if (this.recorder.getState() === "inactive") {
this.setState({
currentState: "OFF",
})
} else {
outputBlob = await this.recorder.stop()
this.setState({
outputBlob,
currentState: "PREVIEW_FILE",
})
}
}
}
private onCountdownEnd = async (): Promise<any> => {
if (this.recorder == null) {
// Should never happen.
throw new Error("Countdown finished but recorder is null")
}
const hasStarted = this.recorder.start()
if (hasStarted) {
this.setState({
currentState: "RECORDING",
})
} else {
this.stopRecording().catch(err =>
logWarning(`withScreencast.stopRecording threw an error: ${err}`)
)
}
}
private getScreenCastProps = (): ScreenCastHOC => ({
currentState: this.state.currentState,
toggleRecordAudio: this.toggleRecordAudio,
startRecording: this.showDialog,
stopRecording: this.stopRecording,
})
private closeDialog = (): void => {
this.setState({
currentState: "OFF",
})
}
public render(): ReactNode {
const {
outputBlob,
fileName,
recordAudio,
currentState,
}: WithScreenCastState = this.state
return (
<div className="withScreencast">
<WrappedComponent
screenCast={this.getScreenCastProps()}
{...this.props}
/>
{currentState === "UNSUPPORTED" && (
<UnsupportedBrowserDialog onClose={this.closeDialog} />
)}
{currentState === "SETUP" && (
<ScreencastDialog
recordAudio={recordAudio}
onClose={this.closeDialog}
startRecording={this.startRecording}
toggleRecordAudio={this.toggleRecordAudio}
/>
)}
{currentState === "COUNTDOWN" && (
<Countdown countdown={3} endCallback={this.onCountdownEnd} />
)}
{currentState === "PREVIEW_FILE" && outputBlob && (
<VideoRecordedDialog
onClose={this.closeDialog}
videoBlob={outputBlob}
fileName={fileName}
/>
)}
</div>
)
}
}
// Static methods must be copied over
// https://en.reactjs.org/docs/higher-order-components.html#static-methods-must-be-copied-over
return hoistNonReactStatics(ComponentWithScreencast, WrappedComponent)
}
export default withScreencast