Add share menu action to attachment context menu

Tusker/Screens/Large Image/LargeImageContentView.swift

@@ -197,7 +197,7 @@ class LargeImageGifvContentView: GifvAttachmentView, LargeImageContentView {
     
 }
 
-fileprivate class ImageActivityItemSource: NSObject, UIActivityItemSource {
+class ImageActivityItemSource: NSObject, UIActivityItemSource {
     let data: Data
     let url: URL
     let image: UIImage?
@@ -231,7 +231,7 @@ fileprivate class ImageActivityItemSource: NSObject, UIActivityItemSource {
     }
 }
 
-fileprivate class GifvActivityItemSource: NSObject, UIActivityItemSource {
+class GifvActivityItemSource: NSObject, UIActivityItemSource {
     let asset: AVAsset
     let attachment: Attachment
     

Tusker/Views/Attachments/AttachmentView.swift

@@ -203,7 +203,7 @@ class AttachmentView: GIFImageView {
                 await displayImage()
             }
         } else if let image {
-            source = .image(attachment.url, image)
+            source = .image(attachment.url, data, image)
             await displayImage()
         }
     }
@@ -225,7 +225,7 @@ class AttachmentView: GIFImageView {
                 return
             }
             
-            source = .image(previewURL, image)
+            source = .image(previewURL, nil, image)
             await displayImage()
         } else {
             let asset = AVURLAsset(url: attachment.url)
@@ -246,7 +246,7 @@ class AttachmentView: GIFImageView {
                   !Task.isCancelled else {
                 return
             }
-            source = .image(attachment.url, prepared)
+            source = .image(attachment.url, nil, prepared)
             await displayImage()
         }
     }
@@ -315,7 +315,7 @@ class AttachmentView: GIFImageView {
         case nil:
             self.image = nil
             
-        case let .image(url, sourceImage):
+        case let .image(url, _, sourceImage):
             if isGrayscale {
                 self.image = await ImageGrayscalifier.convert(url: url, image: sourceImage)
             } else {
@@ -329,13 +329,6 @@ class AttachmentView: GIFImageView {
             } else {
                 self.image = sourceImage
             }
-            
-        case let .cgImage(url, cgImage):
-            if isGrayscale {
-                self.image = await ImageGrayscalifier.convert(url: url, cgImage: cgImage)
-            } else {
-                self.image = UIImage(cgImage: cgImage)
-            }
         }
     }
     
@@ -424,9 +417,9 @@ class AttachmentView: GIFImageView {
 
 fileprivate extension AttachmentView {
     enum Source {
-        case image(URL, UIImage)
+        case image(URL, Data?, UIImage)
         case gifData(URL, Data, UIImage?)
-        case cgImage(URL, CGImage)
+//        case cgImage(URL, CGImage)
     }
     
     struct Badges: OptionSet {
@@ -439,7 +432,7 @@ fileprivate extension AttachmentView {
 
 extension AttachmentView: UIContextMenuInteractionDelegate {
     func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
-        return UIContextMenuConfiguration(identifier: nil, previewProvider: { () -> UIViewController? in
+        return UIContextMenuConfiguration { [unowned self] () -> UIViewController? in
             if self.attachment.kind == .image {
                 return AttachmentPreviewViewController(sourceView: self)
             } else if self.attachment.kind == .gifv {
@@ -449,8 +442,38 @@ extension AttachmentView: UIContextMenuInteractionDelegate {
             } else {
                 return self.delegate?.attachmentViewGallery(startingAt: self.index)
             }
-        }, actionProvider: nil)
+        } actionProvider: { [unowned self] _ in
+            let itemSource: UIActivityItemSource
+            if self.attachment.kind == .image,
+               let source {
+                switch source {
+                case .image(let url, let data, let image):
+                    let imageData: Data
+                    if let data {
+                        imageData = data
+                    } else if let data = image.pngData() {
+                        imageData = data
+                    } else {
+                        return nil
+                    }
+                    itemSource = ImageActivityItemSource(data: imageData, url: url, image: image)
+                case .gifData(let url, let data, let image):
+                    itemSource = ImageActivityItemSource(data: data, url: url, image: image)
+                }
+            } else if self.attachment.kind == .gifv {
+                itemSource = GifvActivityItemSource(asset: AVAsset(url: self.attachment.url), attachment: self.attachment)
+            } else {
+                return nil
+            }
+            return UIMenu(children: [
+                UIAction(title: "Share…", image: UIImage(systemName: "square.and.arrow.up")) { [unowned self] _ in
+                    let vc = UIActivityViewController(activityItems: [itemSource], applicationActivities: [SaveToPhotosActivity()])
+                    self.delegate?.attachmentViewPresent(vc, animated: true)
+                }
+            ])
+        }
     }
+    
     func contextMenuInteraction(_ interaction: UIContextMenuInteraction, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
         animator.addCompletion {
             animator.preferredCommitStyle = .pop