Add back ImageEditingExample example (#19972)
Summary: add back missing file. pass all current ci. none [GENERAL] [INTERNAL] [RNTester] - Add back ImageEditingExample example. Closes https://github.com/facebook/react-native/pull/19972 Differential Revision: D8711888 Pulled By: TheSavior fbshipit-source-id: 14070bfbf747f7f59c4039981a9bc83c1c10862b
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gengjiawen
Facebook Github Bot
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@ -5,5 +5,306 @@
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @flow strict
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* @flow
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*/
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'use strict';
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var React = require('react');
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var ReactNative = require('react-native');
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var {
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CameraRoll,
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Image,
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ImageEditor,
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Platform,
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ScrollView,
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StyleSheet,
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Text,
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TouchableHighlight,
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View,
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} = ReactNative;
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var PAGE_SIZE = 20;
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type ImageOffset = {
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x: number,
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y: number,
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};
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type ImageSize = {
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width: number,
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height: number,
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};
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type ImageCropData = {
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offset: ImageOffset,
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size: ImageSize,
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displaySize?: ?ImageSize,
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resizeMode?: ?any,
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};
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class SquareImageCropper extends React.Component<$FlowFixMeProps, $FlowFixMeState> {
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state: any;
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_isMounted: boolean;
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_transformData: ImageCropData;
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constructor(props) {
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super(props);
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this._isMounted = true;
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this.state = {
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randomPhoto: null,
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measuredSize: null,
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croppedImageURI: null,
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cropError: null,
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};
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this._fetchRandomPhoto();
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}
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async _fetchRandomPhoto() {
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try {
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const data = await CameraRoll.getPhotos({first: PAGE_SIZE});
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if (!this._isMounted) {
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return;
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}
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var edges = data.edges;
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var edge = edges[Math.floor(Math.random() * edges.length)];
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var randomPhoto = edge && edge.node && edge.node.image;
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if (randomPhoto) {
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this.setState({randomPhoto});
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}
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} catch (error) {
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console.warn("Can't get a photo from camera roll", error);
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}
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}
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componentWillUnmount() {
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this._isMounted = false;
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}
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render() {
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if (!this.state.measuredSize) {
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return (
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<View
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style={styles.container}
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onLayout={event => {
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var measuredWidth = event.nativeEvent.layout.width;
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if (!measuredWidth) {
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return;
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}
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this.setState({
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measuredSize: {width: measuredWidth, height: measuredWidth},
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});
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}}
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/>
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);
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}
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if (!this.state.croppedImageURI) {
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return this._renderImageCropper();
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}
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return this._renderCroppedImage();
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}
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_renderImageCropper() {
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if (!this.state.randomPhoto) {
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return <View style={styles.container} />;
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}
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var error = null;
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if (this.state.cropError) {
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error = <Text>{this.state.cropError.message}</Text>;
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}
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return (
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<View style={styles.container}>
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<Text>Drag the image within the square to crop:</Text>
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<ImageCropper
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image={this.state.randomPhoto}
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size={this.state.measuredSize}
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style={[styles.imageCropper, this.state.measuredSize]}
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onTransformDataChange={data => (this._transformData = data)}
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/>
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<TouchableHighlight
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style={styles.cropButtonTouchable}
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onPress={this._crop.bind(this)}>
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<View style={styles.cropButton}>
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<Text style={styles.cropButtonLabel}>Crop</Text>
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</View>
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</TouchableHighlight>
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{error}
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</View>
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);
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}
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_renderCroppedImage() {
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return (
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<View style={styles.container}>
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<Text>Here is the cropped image:</Text>
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<Image
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source={{uri: this.state.croppedImageURI}}
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style={[styles.imageCropper, this.state.measuredSize]}
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/>
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<TouchableHighlight
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style={styles.cropButtonTouchable}
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onPress={this._reset.bind(this)}>
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<View style={styles.cropButton}>
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<Text style={styles.cropButtonLabel}>Try again</Text>
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</View>
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</TouchableHighlight>
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</View>
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);
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}
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_crop() {
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ImageEditor.cropImage(
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this.state.randomPhoto.uri,
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this._transformData,
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croppedImageURI => this.setState({croppedImageURI}),
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cropError => this.setState({cropError}),
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);
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}
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_reset() {
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this.setState({
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randomPhoto: null,
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croppedImageURI: null,
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cropError: null,
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});
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this._fetchRandomPhoto();
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}
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}
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class ImageCropper extends React.Component<$FlowFixMeProps, $FlowFixMeState> {
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_contentOffset: ImageOffset;
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_maximumZoomScale: number;
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_minimumZoomScale: number;
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_scaledImageSize: ImageSize;
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_horizontal: boolean;
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componentWillMount() {
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// Scale an image to the minimum size that is large enough to completely
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// fill the crop box.
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var widthRatio = this.props.image.width / this.props.size.width;
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var heightRatio = this.props.image.height / this.props.size.height;
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this._horizontal = widthRatio > heightRatio;
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if (this._horizontal) {
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this._scaledImageSize = {
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width: this.props.image.width / heightRatio,
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height: this.props.size.height,
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};
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} else {
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this._scaledImageSize = {
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width: this.props.size.width,
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height: this.props.image.height / widthRatio,
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};
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if (Platform.OS === 'android') {
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// hack to work around Android ScrollView a) not supporting zoom, and
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// b) not supporting vertical scrolling when nested inside another
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// vertical ScrollView (which it is, when displayed inside UIExplorer)
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this._scaledImageSize.width *= 2;
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this._scaledImageSize.height *= 2;
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this._horizontal = true;
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}
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}
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this._contentOffset = {
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x: (this._scaledImageSize.width - this.props.size.width) / 2,
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y: (this._scaledImageSize.height - this.props.size.height) / 2,
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};
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this._maximumZoomScale = Math.min(
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this.props.image.width / this._scaledImageSize.width,
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this.props.image.height / this._scaledImageSize.height,
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);
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this._minimumZoomScale = Math.max(
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this.props.size.width / this._scaledImageSize.width,
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this.props.size.height / this._scaledImageSize.height,
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);
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this._updateTransformData(
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this._contentOffset,
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this._scaledImageSize,
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this.props.size,
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);
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}
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_onScroll(event) {
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this._updateTransformData(
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event.nativeEvent.contentOffset,
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event.nativeEvent.contentSize,
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event.nativeEvent.layoutMeasurement,
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);
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}
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_updateTransformData(offset, scaledImageSize, croppedImageSize) {
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var offsetRatioX = offset.x / scaledImageSize.width;
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var offsetRatioY = offset.y / scaledImageSize.height;
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var sizeRatioX = croppedImageSize.width / scaledImageSize.width;
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var sizeRatioY = croppedImageSize.height / scaledImageSize.height;
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var cropData: ImageCropData = {
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offset: {
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x: this.props.image.width * offsetRatioX,
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y: this.props.image.height * offsetRatioY,
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},
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size: {
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width: this.props.image.width * sizeRatioX,
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height: this.props.image.height * sizeRatioY,
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},
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};
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this.props.onTransformDataChange &&
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this.props.onTransformDataChange(cropData);
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}
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render() {
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return (
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<ScrollView
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alwaysBounceVertical={true}
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automaticallyAdjustContentInsets={false}
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contentOffset={this._contentOffset}
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decelerationRate="fast"
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horizontal={this._horizontal}
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maximumZoomScale={this._maximumZoomScale}
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minimumZoomScale={this._minimumZoomScale}
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onMomentumScrollEnd={this._onScroll.bind(this)}
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onScrollEndDrag={this._onScroll.bind(this)}
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showsHorizontalScrollIndicator={false}
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showsVerticalScrollIndicator={false}
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style={this.props.style}
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scrollEventThrottle={16}>
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<Image source={this.props.image} style={this._scaledImageSize} />
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</ScrollView>
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);
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}
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}
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exports.framework = 'React';
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exports.title = 'ImageEditor';
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exports.description = 'Cropping and scaling with ImageEditor';
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exports.examples = [
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{
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title: 'Image Cropping',
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render() {
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return <SquareImageCropper />;
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},
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},
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];
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var styles = StyleSheet.create({
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container: {
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flex: 1,
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alignSelf: 'stretch',
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},
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imageCropper: {
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alignSelf: 'center',
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marginTop: 12,
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},
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cropButtonTouchable: {
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alignSelf: 'center',
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marginTop: 12,
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},
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cropButton: {
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padding: 12,
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backgroundColor: 'blue',
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borderRadius: 4,
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},
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cropButtonLabel: {
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color: 'white',
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fontSize: 16,
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fontWeight: '500',
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},
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});
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