WIP: show full screen media gallery in message info screen

Session/Media Viewing & Editing/MediaGalleryNavigationController.swift

@@ -74,3 +74,33 @@ class MediaGalleryNavigationController: UINavigationController {
         relayoutBackgroundView()
     }
 }
+
+// MARK: - SwiftUI
+import SwiftUI
+
+struct MediaGalleryNavigationController_SwiftUI: UIViewControllerRepresentable {
+    typealias UIViewControllerType = MediaGalleryNavigationController
+    
+    public var viewControllers: [UIViewController]
+    private let transitioningDelegate: UIViewControllerTransitioningDelegate?
+    
+    public init(
+        viewControllers: [UIViewController],
+        transitioningDelegate: UIViewControllerTransitioningDelegate? = nil
+    ) {
+        self.viewControllers = viewControllers
+        self.transitioningDelegate = transitioningDelegate
+    }
+    
+    func makeUIViewController(context: Context) -> MediaGalleryNavigationController {
+        let mediaGalleryNavigationController = MediaGalleryNavigationController()
+        mediaGalleryNavigationController.modalPresentationStyle = .fullScreen
+        mediaGalleryNavigationController.transitioningDelegate = transitioningDelegate
+        
+        return mediaGalleryNavigationController
+    }
+    
+    func updateUIViewController(_ mediaGalleryNavigationController: MediaGalleryNavigationController, context: Context) {
+        mediaGalleryNavigationController.viewControllers = viewControllers
+    }
+}

Session/Media Viewing & Editing/MediaGalleryViewModel.swift

@@ -5,6 +5,7 @@ import GRDB
 import DifferenceKit
 import SignalUtilitiesKit
 import SessionUtilitiesKit
+import SwiftUI
 
 public class MediaGalleryViewModel {
     public typealias SectionModel = ArraySection<Section, Item>
@@ -565,6 +566,44 @@ public class MediaGalleryViewModel {
         return navController
     }
     
+    public static func createDetailViewSwiftUI(
+        for threadId: String,
+        threadVariant: SessionThread.Variant,
+        interactionId: Int64,
+        selectedAttachmentId: String,
+        options: [MediaGalleryOption]
+    ) -> (any UIViewControllerRepresentable)? {
+        // Load the data for the album immediately (needed before pushing to the screen so
+        // transitions work nicely)
+        let viewModel: MediaGalleryViewModel = MediaGalleryViewModel(
+            threadId: threadId,
+            threadVariant: threadVariant,
+            isPagedData: false,
+            mediaType: .media
+        )
+        viewModel.loadAndCacheAlbumData(for: interactionId, in: threadId)
+        viewModel.replaceAlbumObservation(toObservationFor: interactionId)
+        
+        guard
+            !viewModel.albumData.isEmpty,
+            let initialItem: Item = viewModel.albumData[interactionId]?.first(where: { item -> Bool in
+                item.attachment.id == selectedAttachmentId
+            })
+        else { return nil }
+        
+        let pageViewController: MediaPageViewController = MediaPageViewController(
+            viewModel: viewModel,
+            initialItem: initialItem,
+            options: options
+        )
+        let navController = MediaGalleryNavigationController_SwiftUI(
+            viewControllers: [pageViewController],
+            transitioningDelegate: pageViewController
+        )
+        
+        return navController
+    }
+    
     public static func createMediaTileViewController(
         threadId: String,
         threadVariant: SessionThread.Variant,

Session/Media Viewing & Editing/MessageInfoView.swift

@@ -406,6 +406,19 @@ struct MessageInfoView: View {
             }
         }
     }
+    
+    private func showMediaFullScreen(attachment: Attachment) {
+        let viewController: UIViewController? = MediaGalleryViewModel.createDetailViewController(
+            for: messageViewModel.threadId,
+            threadVariant: messageViewModel.threadVariant,
+            interactionId: messageViewModel.id,
+            selectedAttachmentId: attachment.id,
+            options: [ .sliderEnabled ]
+        )
+        if let viewController: UIViewController = viewController {
+            viewController.transitioningDelegate = nil
+        }
+    }
 }
 
 struct InfoBlock<Content>: View where Content: View {