Use a snapshot view for context menu previews.

Riot/Modules/Home/ContextMenuSnapshotPreviewViewController.swift

@@ -16,23 +16,21 @@
 
 import UIKit
 
-/// A view controller that provides a preview of a room for use in context menus.
+/// A view controller that provides a preview for use in context menus.
+/// The preview will display a snapshot of whichever view is passed into the init.
 @objcMembers
-class RoomPreviewViewController: UIViewController {
-    
-    // MARK: - Constants
-    private enum Constants {
-        static let size = CGSize(width: 80, height: 115)
-    }
+class ContextMenuSnapshotPreviewViewController: UIViewController {
     
     // MARK: - Private
     
-    private var cellData: MXKCellData
+    private let snapshotView: UIView?
     
     // MARK: - Setup
     
-    init(cellData: MXKCellData) {
-        self.cellData = cellData
+    /// Creates a new preview by snapshotting the supplied view.
+    /// - Parameter view: The view to use as a preview.
+    init(view: UIView) {
+        self.snapshotView = view.snapshotView(afterScreenUpdates: false)
         super.init(nibName: nil, bundle: nil)
     }
     
@@ -40,16 +38,15 @@ class RoomPreviewViewController: UIViewController {
         fatalError("init(coder:) has not been implemented")
     }
     
-    // MARK: - Lifecyle
+    // MARK: - Lifecycle
     
     override func viewDidLoad() {
         super.viewDidLoad()
         
-        let cell = RoomCollectionViewCell(frame: CGRect(origin: .zero, size: Constants.size))
-        cell.render(cellData)
-        view.vc_addSubViewMatchingParent(cell)
+        guard let snapshotView = snapshotView else { return }
+        view.vc_addSubViewMatchingParent(snapshotView)
         
-        preferredContentSize = Constants.size
+        preferredContentSize = snapshotView.bounds.size
     }
     
 }

Riot/Modules/Home/HomeViewController.m

@@ -673,15 +673,19 @@
 
 - (UIContextMenuConfiguration *)collectionView:(UICollectionView *)collectionView contextMenuConfigurationForItemAtIndexPath:(NSIndexPath *)indexPath point:(CGPoint)point API_AVAILABLE(ios(13.0))
 {
-    id<MXKRecentCellDataStoring> cellData = [recentsDataSource cellDataAtIndexPath:[NSIndexPath indexPathForRow:indexPath.item inSection:collectionView.tag]];
+    UIView *cell = [collectionView cellForItemAtIndexPath:indexPath];
     MXRoom *room = [self.dataSource getRoomAtIndexPath:[NSIndexPath indexPathForRow:indexPath.row inSection:collectionView.tag]];
     NSString *roomId = room.roomId;
     
+    MXWeakify(self);
+    MXWeakify(room);
+    
     return [UIContextMenuConfiguration configurationWithIdentifier:roomId previewProvider:^UIViewController * _Nullable {
         // Add a preview using the cell's data to prevent the avatar and displayname from changing with a room list update.
-        return [[RoomPreviewViewController alloc] initWithCellData:cellData];
+        return [[ContextMenuSnapshotPreviewViewController alloc] initWithView:cell];
+        
     } actionProvider:^UIMenu * _Nullable(NSArray<UIMenuElement *> * _Nonnull suggestedActions) {
-        MXWeakify(self);
+        MXStrongifyAndReturnValueIfNil(room, nil);
         
         BOOL isDirect = room.isDirect;
         UIAction *directChatAction = [UIAction actionWithTitle:isDirect ? VectorL10n.homeContextMenuMakeRoom : VectorL10n.homeContextMenuMakeDm
@@ -736,9 +740,8 @@
         }];
         
         BOOL isLowPriority = (currentTag && [kMXRoomTagLowPriority isEqualToString:currentTag.name]);
-        UIImage *lowPriorityImage = [UIImage systemImageNamed:isLowPriority ? @"arrow.up" : @"arrow.down"];
         UIAction *lowPriorityAction = [UIAction actionWithTitle:isLowPriority ? VectorL10n.homeContextMenuNormalPriority : VectorL10n.homeContextMenuLowPriority
-                                                          image:lowPriorityImage
+                                                          image:[UIImage systemImageNamed:isLowPriority ? @"arrow.up" : @"arrow.down"]
                                                      identifier:nil
                                                         handler:^(__kindof UIAction * _Nonnull action) {
             MXStrongifyAndReturnIfNil(self);

Riot/SupportingFiles/Riot-Bridging-Header.h

@@ -50,7 +50,6 @@
 #import "PlainRoomTimelineCellProvider.h"
 #import "BubbleRoomTimelineCellProvider.h"
 #import "RoomSelectedStickerBubbleCell.h"
-#import "RoomCollectionViewCell.h"
 
 // MatrixKit common imports, shared with all targets
 #import "MatrixKit-Bridging-Header.h"