WIP

1 files changed, 46 insertions, 0 deletions

diff --git a/app_expo/components/auto-image/auto-image.tsx b/app_expo/components/auto-image/auto-image.tsx
new file mode 100644
index 0000000..a8bfe37
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+++ b/app_expo/components/auto-image/auto-image.tsx
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+import React, { useLayoutEffect, useState } from 'react'
+import {
+  Image as RNImage,
+  ImageProps as DefaultImageProps,
+  ImageURISource,
+  Platform,
+} from 'react-native'
+
+type ImageProps = DefaultImageProps & {
+  source: ImageURISource
+}
+
+/**
+ * An Image wrapper component that autosizes itself to the size of the actual image.
+ * You can always override by passing a width and height in the style.
+ * If passing only one of width/height this image component will use the actual
+ * size of the other dimension.
+ *
+ * This component isn't required, but is provided as a convenience so that
+ * we don't have to remember to explicitly set image sizes on every image instance.
+ *
+ * To use as a stand-in replacement import { AutoImage as Image } and remove the
+ * Image import from react-native. Now all images in that file are handled by this
+ * component and are web-ready if not explicitly sized in the style property.
+ */
+export function AutoImage(props: ImageProps) {
+  const [imageSize, setImageSize] = useState({ width: 0, height: 0 })
+
+  useLayoutEffect(() => {
+    if (props.source?.uri) {
+      RNImage.getSize(props.source.uri as any, (width, height) => {
+        setImageSize({ width, height })
+      })
+    } else if (Platform.OS === 'web') {
+      // web requires a different method to get it's size
+      RNImage.getSize(props.source as any, (width, height) => {
+        setImageSize({ width, height })
+      })
+    } else {
+      const { width, height } = RNImage.resolveAssetSource(props.source)
+      setImageSize({ width, height })
+    }
+  }, [])
+
+  return <RNImage {...props} style={[imageSize, props.style]} />
+}