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August 23, 2017 10:42
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example that render things offscreen with gl-react – would love if you find a way to make this use-case less hacky
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| class AutoCaptureGLThing extends Component { | |
| onRef = exportable => { | |
| if (!exportable || this.exporting) return; | |
| this.exporting = true; | |
| exportable.captureFrame(/* see https://projectseptemberinc.gitbooks.io/gl-react/content/docs/api/Surface.html */) | |
| .then(path => { // oops back to node callback pattern via props callback | |
| this.props.onCapture(null, path); | |
| }, error => { | |
| this.props.onCapture(error); | |
| }); | |
| }; | |
| render () { | |
| const deviceWidth = ...; // if you want to render "off screen", position absolute outside of the screen is a hack here | |
| return ( | |
| <View style={{ position: "absolute", top: 0, left: deviceWidth }}> | |
| <Surface ref={this.onRef} ...>...</Surface> | |
| </View> | |
| ); | |
| } | |
| } | |
| module.exports = AutoCaptureContent; |
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| onCapture = (error, snapshot) => { | |
| const { captureRequested } = this.state; | |
| if (error) console.error(error); | |
| else doSomethingWithSnapshot(snapshot); | |
| this.setState({ captureRequested: false }); | |
| }; | |
| render () { | |
| return <View> | |
| <Button onPress={() => this.setState({ captureRequested: true })}>CAPTURE</Button> | |
| <Text>...<Text> | |
| <Text>...<Text> | |
| <Text>...<Text> | |
| {!captureRequested ? null : <AutoCaptureGLThing {...whateverProps} onCapture={this.onCapture} />} | |
| </View>; | |
| } |
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Hi, I think the surface should have the preload={true} option if you're manipulating external images since it may trigger once before loading the image and messing up the file you want to save.