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submodules/TelegramUI/Sources/LockedWindowCoveringView.swift

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+import Foundation
+import Display
+import TelegramPresentationData
+import AsyncDisplayKit
+
+final class LockedWindowCoveringView: WindowCoveringView {
+    private let contentView: UIImageView
+    
+    init(theme: PresentationTheme) {
+        self.contentView = UIImageView()
+        
+        super.init(frame: CGRect())
+        
+        self.backgroundColor =  theme.chatList.backgroundColor
+        self.addSubview(self.contentView)
+    }
+    
+    required init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    func updateTheme(_ theme: PresentationTheme) {
+        self.backgroundColor = theme.chatList.backgroundColor
+    }
+    
+    func updateSnapshot(_ image: UIImage?) {
+        if image != nil {
+            self.contentView.image = image   
+        }
+    }
+    
+    override func updateLayout(_ size: CGSize) {
+        self.contentView.frame = CGRect(origin: CGPoint(), size: size)
+    }
+}