Saves image on long press (#83)

* Saves image on long press

* Adds save on long press

* Forking lightbox

* move to wrapper only to the bottom sheet to reduce impact of this change

* lint

* lint

* lint

* Use official `share` API

* Clean up cache after download

* comment

* comment

* Reduce swipe close velocity

* Updates per feedback

* lint

* bugfix

* Adds delayed press-in for TouchableOpacity

1 files changed, 32 insertions, 0 deletions

diff --git a/src/view/com/lightbox/ImageViewing/hooks/useImageIndexChange.ts b/src/view/com/lightbox/ImageViewing/hooks/useImageIndexChange.ts
new file mode 100644
index 000000000..16430f3aa
--- /dev/null
+++ b/src/view/com/lightbox/ImageViewing/hooks/useImageIndexChange.ts
@@ -0,0 +1,32 @@
+/**
+ * Copyright (c) JOB TODAY S.A. 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.
+ *
+ */
+
+import {useState} from 'react'
+import {NativeSyntheticEvent, NativeScrollEvent} from 'react-native'
+
+import {Dimensions} from '../@types'
+
+const useImageIndexChange = (imageIndex: number, screen: Dimensions) => {
+  const [currentImageIndex, setImageIndex] = useState(imageIndex)
+  const onScroll = (event: NativeSyntheticEvent<NativeScrollEvent>) => {
+    const {
+      nativeEvent: {
+        contentOffset: {x: scrollX},
+      },
+    } = event
+
+    if (screen.width) {
+      const nextIndex = Math.round(scrollX / screen.width)
+      setImageIndex(nextIndex < 0 ? 0 : nextIndex)
+    }
+  }
+
+  return [currentImageIndex, onScroll] as const
+}
+
+export default useImageIndexChange