Minor improvements to web autocomplete in composer

src/view/com/composer/autocomplete/Autocomplete.tsx

@@ -0,0 +1,77 @@
+import React, {useEffect} from 'react'
+import {
+  Animated,
+  TouchableOpacity,
+  StyleSheet,
+  useWindowDimensions,
+} from 'react-native'
+import {useAnimatedValue} from 'lib/hooks/useAnimatedValue'
+import {usePalette} from 'lib/hooks/usePalette'
+import {Text} from '../../util/text/Text'
+
+interface AutocompleteItem {
+  handle: string
+  displayName?: string
+}
+
+export function Autocomplete({
+  active,
+  items,
+  onSelect,
+}: {
+  active: boolean
+  items: AutocompleteItem[]
+  onSelect: (item: string) => void
+}) {
+  const pal = usePalette('default')
+  const winDim = useWindowDimensions()
+  const positionInterp = useAnimatedValue(0)
+
+  useEffect(() => {
+    Animated.timing(positionInterp, {
+      toValue: active ? 1 : 0,
+      duration: 200,
+      useNativeDriver: false,
+    }).start()
+  }, [positionInterp, active])
+
+  const topAnimStyle = {
+    top: positionInterp.interpolate({
+      inputRange: [0, 1],
+      outputRange: [winDim.height, winDim.height / 4],
+    }),
+  }
+  return (
+    <Animated.View style={[styles.outer, pal.view, pal.border, topAnimStyle]}>
+      {items.map((item, i) => (
+        <TouchableOpacity
+          testID="autocompleteButton"
+          key={i}
+          style={[pal.border, styles.item]}
+          onPress={() => onSelect(item.handle)}>
+          <Text type="md-medium" style={pal.text}>
+            {item.displayName || item.handle}
+            <Text type="sm" style={pal.textLight}>
+              &nbsp;@{item.handle}
+            </Text>
+          </Text>
+        </TouchableOpacity>
+      ))}
+    </Animated.View>
+  )
+}
+
+const styles = StyleSheet.create({
+  outer: {
+    position: 'absolute',
+    left: 0,
+    right: 0,
+    bottom: 0,
+    borderTopWidth: 1,
+  },
+  item: {
+    borderBottomWidth: 1,
+    paddingVertical: 16,
+    paddingHorizontal: 16,
+  },
+})