Enable gallery interactive dismissal for statuses with >4 attachments

Closes #466

Packages/GalleryVC/Sources/GalleryVC/GalleryDismissAnimationController.swift

@@ -52,6 +52,9 @@ class GalleryDismissAnimationController: NSObject, UIViewControllerAnimatedTrans
             appliedSourceToDestTransform = false
         }
         
+        to.view.frame = container.bounds
+        from.view.frame = container.bounds
+
         let content = itemViewController.takeContent()
         content.view.translatesAutoresizingMaskIntoConstraints = true
         content.view.layer.masksToBounds = true
@@ -112,6 +115,8 @@ class GalleryDismissAnimationController: NSObject, UIViewControllerAnimatedTrans
             return
         }
         
+        toVC.view.frame = transitionContext.containerView.bounds
+        fromVC.view.frame = transitionContext.containerView.bounds
         transitionContext.containerView.addSubview(toVC.view)
         transitionContext.containerView.addSubview(fromVC.view)
         

Packages/GalleryVC/Sources/GalleryVC/GalleryPresentationAnimationController.swift

@@ -109,8 +109,6 @@ class GalleryPresentationAnimationController: NSObject, UIViewControllerAnimated
             itemViewController.addContent()
             
             transitionContext.completeTransition(true)
-            
-            to.presentationAnimationCompleted()
         }
         
         animator.startAnimation()
@@ -121,8 +119,9 @@ class GalleryPresentationAnimationController: NSObject, UIViewControllerAnimated
             return
         }
         
-        transitionContext.containerView.addSubview(to.view)
         to.view.alpha = 0
+        to.view.frame = transitionContext.containerView.bounds
+        transitionContext.containerView.addSubview(to.view)
         
         let duration = transitionDuration(using: transitionContext)
         let animator = UIViewPropertyAnimator(duration: duration, curve: .easeInOut)
@@ -131,8 +130,6 @@ class GalleryPresentationAnimationController: NSObject, UIViewControllerAnimated
         }
         animator.addCompletion { _ in
             transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
-            
-            to.presentationAnimationCompleted()
         }
         animator.startAnimation()
     }

Packages/GalleryVC/Sources/GalleryVC/GalleryViewController.swift

@@ -68,6 +68,17 @@ public class GalleryViewController: UIPageViewController {
         setViewControllers([makeItemVC(index: initialItemIndex)], direction: .forward, animated: false)
     }
     
+    public override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        
+        if animated {
+            // Wait until the transition is no longer in-progress, otherwise things will just get deferred again.
+            DispatchQueue.main.async {
+                self.presentationAnimationCompleted()
+            }
+        }
+    }
+    
     public override func viewWillDisappear(_ animated: Bool) {
         super.viewWillDisappear(animated)
         

Tusker/Screens/Gallery/StatusAttachmentsGalleryDataSource.swift

@@ -15,10 +15,12 @@ import AVFoundation
 class StatusAttachmentsGalleryDataSource: GalleryDataSource {
     let attachments: [Attachment]
     let sourceViews: NSHashTable<AttachmentView>
+    weak var moreView: UIView?
     
-    init(attachments: [Attachment], sourceViews: NSHashTable<AttachmentView>) {
+    init(attachments: [Attachment], sourceViews: NSHashTable<AttachmentView>, moreView: UIView?) {
         self.attachments = attachments
         self.sourceViews = sourceViews
+        self.moreView = moreView
     }
     
     func galleryItemsCount() -> Int {
@@ -39,6 +41,21 @@ class StatusAttachmentsGalleryDataSource: GalleryDataSource {
                     // TODO: if automatically play gifs is off, this will start the source view playing too
                     gifController: view.gifController
                 )
+            } else if let entry = ImageCache.attachments.get(attachment.url, loadOriginal: true) {
+                let gifController: GIFController? =
+                    if attachment.url.pathExtension == "gif",
+                       let data = entry.data {
+                        GIFController(gifData: data)
+                    } else {
+                        nil
+                    }
+                return ImageGalleryContentViewController(
+                    url: attachment.url,
+                    caption: attachment.description,
+                    originalData: entry.data,
+                    image: entry.image,
+                    gifController: gifController
+                )
             } else {
                 return LoadingGalleryContentViewController {
                     let (data, image) = await ImageCache.attachments.get(attachment.url, loadOriginal: true)
@@ -92,8 +109,12 @@ class StatusAttachmentsGalleryDataSource: GalleryDataSource {
     }
     
     func galleryContentTransitionSourceView(forItemAt index: Int) -> UIView? {
-        let attachment = attachments[index]
-        return attachmentView(for: attachment)
+        if attachments.count > 4 && index >= 3 {
+            return moreView
+        } else {
+            let attachment = attachments[index]
+            return attachmentView(for: attachment)
+        }
     }
     
     func galleryApplicationActivities(forItemAt index: Int) -> [UIActivity]? {

Tusker/Screens/Status Edit History/StatusEditCollectionViewCell.swift

@@ -238,7 +238,8 @@ extension StatusEditCollectionViewCell: AttachmentViewDelegate {
     func attachmentViewGallery(startingAt index: Int) -> UIViewController? {
         let attachments = attachmentsView.attachments!
         let sourceViews = attachmentsView.attachmentViews.copy() as! NSHashTable<AttachmentView>
-        return GalleryVC.GalleryViewController(dataSource: StatusAttachmentsGalleryDataSource(attachments: attachments, sourceViews: sourceViews), initialItemIndex: index)
+        let dataSource = StatusAttachmentsGalleryDataSource(attachments: attachments, sourceViews: sourceViews, moreView: attachmentsView.moreView)
+        return GalleryVC.GalleryViewController(dataSource: dataSource, initialItemIndex: index)
     }
     
     func attachmentViewPresent(_ vc: UIViewController, animated: Bool) {

Tusker/Views/Attachments/AttachmentsContainerView.swift

@@ -18,7 +18,7 @@ class AttachmentsContainerView: UIView {
     
     let attachmentViews: NSHashTable<AttachmentView> = .weakObjects()
     let attachmentStacks: NSHashTable<UIStackView> = .weakObjects()
-    var moreView: UIView?
+    private(set) var moreView: UIView?
     private var aspectRatioConstraint: NSLayoutConstraint?
     private(set) var aspectRatio: CGFloat = 16/9 {
         didSet {

Tusker/Views/Status/StatusCollectionViewCell.swift

@@ -334,7 +334,8 @@ extension StatusCollectionViewCell {
             return nil
         }
         let sourceViews = attachmentsView.attachmentViews.copy() as! NSHashTable<AttachmentView>
-        return GalleryVC.GalleryViewController(dataSource: StatusAttachmentsGalleryDataSource(attachments: status.attachments, sourceViews: sourceViews), initialItemIndex: index)
+        let dataSource = StatusAttachmentsGalleryDataSource(attachments: status.attachments, sourceViews: sourceViews, moreView: attachmentsView.moreView)
+        return GalleryVC.GalleryViewController(dataSource: dataSource, initialItemIndex: index)
     }
     
     func attachmentViewPresent(_ vc: UIViewController, animated: Bool) {