Better loading screens

src/view/com/util/LoadingPlaceholder.tsx

@@ -0,0 +1,73 @@
+import React, {useEffect, useMemo} from 'react'
+import {
+  Animated,
+  StyleProp,
+  useWindowDimensions,
+  View,
+  ViewStyle,
+} from 'react-native'
+import LinearGradient from 'react-native-linear-gradient'
+import {colors} from '../../lib/styles'
+
+export function LoadingPlaceholder({
+  width,
+  height,
+  style,
+}: {
+  width: string | number
+  height: string | number
+  style?: StyleProp<ViewStyle>
+}) {
+  const dim = useWindowDimensions()
+  const elWidth = typeof width === 'string' ? dim.width : width
+  const offset = useMemo(() => new Animated.Value(elWidth * -1), [])
+  useEffect(() => {
+    const anim = Animated.loop(
+      Animated.sequence([
+        Animated.timing(offset, {
+          toValue: elWidth,
+          duration: 1e3,
+          useNativeDriver: true,
+          isInteraction: false,
+        }),
+        Animated.timing(offset, {
+          toValue: elWidth * -1,
+          duration: 0,
+          delay: 500,
+          useNativeDriver: true,
+          isInteraction: false,
+        }),
+      ]),
+    )
+    anim.start()
+    return () => anim.stop()
+  }, [])
+
+  return (
+    <View
+      style={[
+        {
+          width,
+          height,
+          backgroundColor: colors.gray2,
+          borderRadius: 6,
+          overflow: 'hidden',
+        },
+        style,
+      ]}>
+      <Animated.View
+        style={{
+          width,
+          height,
+          transform: [{translateX: offset}],
+        }}>
+        <LinearGradient
+          colors={[colors.gray2, '#d4d2d2', colors.gray2]}
+          start={{x: 0, y: 0}}
+          end={{x: 1, y: 0}}
+          style={{width: '100%', height: '100%'}}
+        />
+      </Animated.View>
+    </View>
+  )
+}