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* Copyright (c) Nicolas Gallagher.
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
import type { ImageProps } from './types';
import * as React from 'react';
import createElement from '../createElement';
import css from '../StyleSheet/css';
import { getAssetByID } from '../../modules/AssetRegistry';
import resolveShadowValue from '../StyleSheet/resolveShadowValue';
import ImageLoader from '../../modules/ImageLoader';
import PixelRatio from '../PixelRatio';
import StyleSheet from '../StyleSheet';
import TextAncestorContext from '../Text/TextAncestorContext';
import View from '../View';
export type { ImageProps };
const ERRORED = 'ERRORED';
const LOADED = 'LOADED';
const LOADING = 'LOADING';
const IDLE = 'IDLE';
let _filterId = 0;
const svgDataUriPattern = /^(data:image\/svg\+xml;utf8,)(.*)/;
function createTintColorSVG(tintColor, id) {
return tintColor && id != null ? (
<svg style={{ position: 'absolute', height: 0, visibility: 'hidden', width: 0 }}>
<defs>
<filter id={`tint-${id}`} suppressHydrationWarning={true}>
<feFlood floodColor={`${tintColor}`} key={tintColor} />
<feComposite in2="SourceAlpha" operator="atop" />
</filter>
</defs>
</svg>
) : null;
}
function getFlatStyle(style, blurRadius, filterId) {
const flatStyle = { ...StyleSheet.flatten(style) };
const { filter, resizeMode, shadowOffset, tintColor } = flatStyle;
// Add CSS filters
// React Native exposes these features as props and proprietary styles
const filters = [];
let _filter = null;
Iif (filter) {
filters.push(filter);
}
if (blurRadius) {
filters.push(`blur(${blurRadius}px)`);
}
if (shadowOffset) {
const shadowString = resolveShadowValue(flatStyle);
Eif (shadowString) {
filters.push(`drop-shadow(${shadowString})`);
}
}
if (tintColor && filterId != null) {
filters.push(`url(#tint-${filterId})`);
}
if (filters.length > 0) {
_filter = filters.join(' ');
}
// These styles are converted to CSS filters applied to the
// element displaying the background image.
delete flatStyle.blurRadius;
delete flatStyle.shadowColor;
delete flatStyle.shadowOpacity;
delete flatStyle.shadowOffset;
delete flatStyle.shadowRadius;
delete flatStyle.tintColor;
// These styles are not supported on View
delete flatStyle.overlayColor;
delete flatStyle.resizeMode;
return [flatStyle, resizeMode, _filter, tintColor];
}
function resolveAssetDimensions(source) {
if (typeof source === 'number') {
const { height, width } = getAssetByID(source);
return { height, width };
} else if (source != null && !Array.isArray(source) && typeof source === 'object') {
const { height, width } = source;
return { height, width };
}
}
function resolveAssetUri(source): ?string {
let uri = null;
if (typeof source === 'number') {
// get the URI from the packager
const asset = getAssetByID(source);
let scale = asset.scales[0];
Eif (asset.scales.length > 1) {
const preferredScale = PixelRatio.get();
// Get the scale which is closest to the preferred scale
scale = asset.scales.reduce((prev, curr) =>
Math.abs(curr - preferredScale) < Math.abs(prev - preferredScale) ? curr : prev
);
}
const scaleSuffix = scale !== 1 ? `@${scale}x` : '';
uri = asset ? `${asset.httpServerLocation}/${asset.name}${scaleSuffix}.${asset.type}` : '';
} else if (typeof source === 'string') {
uri = source;
} else if (source && typeof source.uri === 'string') {
uri = source.uri;
}
if (uri) {
const match = uri.match(svgDataUriPattern);
// inline SVG markup may contain characters (e.g., #, ") that need to be escaped
Iif (match) {
const [, prefix, svg] = match;
const encodedSvg = encodeURIComponent(svg);
return `${prefix}${encodedSvg}`;
}
}
return uri;
}
interface ImageStatics {
getSize: (
uri: string,
success: (width: number, height: number) => void,
failure: () => void
) => void;
prefetch: (uri: string) => Promise<void>;
queryCache: (uris: Array<string>) => Promise<{| [uri: string]: 'disk/memory' |}>;
}
const Image: React.AbstractComponent<ImageProps, React.ElementRef<typeof View>> = React.forwardRef(
(props, ref) => {
const {
accessibilityLabel,
blurRadius,
defaultSource,
draggable,
onError,
onLayout,
onLoad,
onLoadEnd,
onLoadStart,
pointerEvents,
source,
style,
...rest
} = props;
Eif (process.env.NODE_ENV !== 'production') {
Iif (props.children) {
throw new Error(
'The <Image> component cannot contain children. If you want to render content on top of the image, consider using the <ImageBackground> component or absolute positioning.'
);
}
}
const [state, updateState] = React.useState(() => {
const uri = resolveAssetUri(source);
if (uri != null) {
const isLoaded = ImageLoader.has(uri);
if (isLoaded) {
return LOADED;
}
}
return IDLE;
});
const [layout, updateLayout] = React.useState({});
const hasTextAncestor = React.useContext(TextAncestorContext);
const hiddenImageRef = React.useRef(null);
const filterRef = React.useRef(_filterId++);
const requestRef = React.useRef(null);
const shouldDisplaySource = state === LOADED || (state === LOADING && defaultSource == null);
const [flatStyle, _resizeMode, filter, tintColor] = getFlatStyle(
style,
blurRadius,
filterRef.current
);
const resizeMode = props.resizeMode || _resizeMode || 'cover';
const selectedSource = shouldDisplaySource ? source : defaultSource;
const displayImageUri = resolveAssetUri(selectedSource);
const imageSizeStyle = resolveAssetDimensions(selectedSource);
const backgroundImage = displayImageUri ? `url("${displayImageUri}")` : null;
const backgroundSize = getBackgroundSize();
// Accessibility image allows users to trigger the browser's image context menu
const hiddenImage = displayImageUri
? createElement('img', {
alt: accessibilityLabel || '',
classList: [classes.accessibilityImage],
draggable: draggable || false,
ref: hiddenImageRef,
src: displayImageUri
})
: null;
function getBackgroundSize(): ?string {
Iif (hiddenImageRef.current != null && (resizeMode === 'center' || resizeMode === 'repeat')) {
const { naturalHeight, naturalWidth } = hiddenImageRef.current;
const { height, width } = layout;
if (naturalHeight && naturalWidth && height && width) {
const scaleFactor = Math.min(1, width / naturalWidth, height / naturalHeight);
const x = Math.ceil(scaleFactor * naturalWidth);
const y = Math.ceil(scaleFactor * naturalHeight);
return `${x}px ${y}px`;
}
}
}
function handleLayout(e) {
if (resizeMode === 'center' || resizeMode === 'repeat' || onLayout) {
const { layout } = e.nativeEvent;
onLayout && onLayout(e);
updateLayout(layout);
}
}
// Image loading
const uri = resolveAssetUri(source);
React.useEffect(() => {
abortPendingRequest();
if (uri != null) {
updateState(LOADING);
if (onLoadStart) {
onLoadStart();
}
requestRef.current = ImageLoader.load(
uri,
function load(e) {
updateState(LOADED);
if (onLoad) {
onLoad(e);
}
if (onLoadEnd) {
onLoadEnd();
}
},
function error() {
updateState(ERRORED);
if (onError) {
onError({
nativeEvent: {
error: `Failed to load resource ${uri} (404)`
}
});
}
if (onLoadEnd) {
onLoadEnd();
}
}
);
}
function abortPendingRequest() {
Iif (requestRef.current != null) {
ImageLoader.abort(requestRef.current);
requestRef.current = null;
}
}
return abortPendingRequest;
}, [uri, requestRef, updateState, onError, onLoad, onLoadEnd, onLoadStart]);
return (
<View
{...rest}
accessibilityLabel={accessibilityLabel}
onLayout={handleLayout}
pointerEvents={pointerEvents}
ref={ref}
style={[styles.root, hasTextAncestor && styles.inline, imageSizeStyle, flatStyle]}
>
<View
style={[
styles.image,
resizeModeStyles[resizeMode],
{ backgroundImage, filter },
backgroundSize != null && { backgroundSize }
]}
suppressHydrationWarning={true}
/>
{hiddenImage}
{createTintColorSVG(tintColor, filterRef.current)}
</View>
);
}
);
Image.displayName = 'Image';
// $FlowIgnore: This is the correct type, but casting makes it unhappy since the variables aren't defined yet
const ImageWithStatics = (Image: React.AbstractComponent<
ImageProps,
React.ElementRef<typeof View>
> &
ImageStatics);
ImageWithStatics.getSize = function (uri, success, failure) {
ImageLoader.getSize(uri, success, failure);
};
ImageWithStatics.prefetch = function (uri) {
return ImageLoader.prefetch(uri);
};
ImageWithStatics.queryCache = function (uris) {
return ImageLoader.queryCache(uris);
};
const classes = css.create({
accessibilityImage: {
...StyleSheet.absoluteFillObject,
height: '100%',
opacity: 0,
width: '100%',
zIndex: -1
}
});
const styles = StyleSheet.create({
root: {
flexBasis: 'auto',
overflow: 'hidden',
zIndex: 0
},
inline: {
display: 'inline-flex'
},
image: {
...StyleSheet.absoluteFillObject,
backgroundColor: 'transparent',
backgroundPosition: 'center',
backgroundRepeat: 'no-repeat',
backgroundSize: 'cover',
height: '100%',
width: '100%',
zIndex: -1
}
});
const resizeModeStyles = StyleSheet.create({
center: {
backgroundSize: 'auto'
},
contain: {
backgroundSize: 'contain'
},
cover: {
backgroundSize: 'cover'
},
none: {
backgroundPosition: '0 0',
backgroundSize: 'auto'
},
repeat: {
backgroundPosition: '0 0',
backgroundRepeat: 'repeat',
backgroundSize: 'auto'
},
stretch: {
backgroundSize: '100% 100%'
}
});
export default ImageWithStatics;
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