Fix previewing video/audio attachments

Tusker/Views/Attachments/AttachmentView.swift

@@ -12,7 +12,8 @@ import Gifu
 import AVFoundation
 
 protocol AttachmentViewDelegate: class {
-    func showAttachmentsGallery(startingAt index: Int)
+    func attachmentViewGallery(startingAt index: Int) -> UIViewController
+    func attachmentViewPresent(_ vc: UIViewController, animated: Bool)
 }
 
 class AttachmentView: UIImageView, GIFAnimatable {
@@ -153,8 +154,15 @@ class AttachmentView: UIImageView, GIFAnimatable {
         updateImageIfNeeded()
     }
     
+    func showGallery() {
+        if let delegate = delegate {
+            let gallery = delegate.attachmentViewGallery(startingAt: index)
+            delegate.attachmentViewPresent(gallery, animated: true)
+        }
+    }
+    
     @objc func imagePressed() {
-        delegate?.showAttachmentsGallery(startingAt: index)
+        showGallery()
     }
 
 }
@@ -162,12 +170,21 @@ class AttachmentView: UIImageView, GIFAnimatable {
 extension AttachmentView: UIContextMenuInteractionDelegate {
     func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
         return UIContextMenuConfiguration(identifier: nil, previewProvider: { () -> UIViewController? in
+            if self.attachment.kind == .image {
                 return AttachmentPreviewViewController(attachment: self.attachment)
+            } else {
+                return self.delegate?.attachmentViewGallery(startingAt: self.index)
+            }
         }, actionProvider: nil)
     }
     func contextMenuInteraction(_ interaction: UIContextMenuInteraction, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
         animator.addCompletion {
-            self.delegate?.showAttachmentsGallery(startingAt: self.index)
+            animator.preferredCommitStyle = .pop
+            if let gallery = animator.previewViewController as? GalleryViewController {
+                self.delegate?.attachmentViewPresent(gallery, animated: true)
+            } else {
+                self.showGallery()
+            }
         }
     }
 }

Tusker/Views/Attachments/AttachmentsContainerView.swift

@@ -366,7 +366,10 @@ class AttachmentsContainerView: UIView {
     @objc func moreViewTapped() {
         guard attachments.count > 4 else { return }
         // the more view shows up in place of the fourth attachemtn view, show tapping it should start at the fourth attachment
-        delegate?.showAttachmentsGallery(startingAt: 3)
+        if let delegate = delegate {
+            let gallery = delegate.attachmentViewGallery(startingAt: 3)
+            delegate.attachmentViewPresent(gallery, animated: true)
+        }
     }
 
 }

Tusker/Views/Status/BaseStatusTableViewCell.swift

@@ -310,10 +310,14 @@ class BaseStatusTableViewCell: UITableViewCell {
 }
 
 extension BaseStatusTableViewCell: AttachmentViewDelegate {
-    func showAttachmentsGallery(startingAt index: Int) {
+    func attachmentViewGallery(startingAt index: Int) -> UIViewController {
         guard let status = mastodonController.cache.status(for: statusID) else { fatalError("Missing cached status \(statusID!)") }
         let sourceViews = status.attachments.map(attachmentsView.getAttachmentView(for:))
-        delegate?.showGallery(attachments: status.attachments, sourceViews: sourceViews, startIndex: index)
+        return delegate!.gallery(attachments: status.attachments, sourceViews: sourceViews, startIndex: index)
+    }
+    
+    func attachmentViewPresent(_ vc: UIViewController, animated: Bool) {
+        delegate?.show(vc)
     }
 }