Various improvements

submodules/Postbox/Sources/ChatInterfaceStateView.swift

@@ -0,0 +1,48 @@
+import Foundation
+
+final class MutableChatInterfaceStateView: MutablePostboxView {
+    fileprivate let peerId: PeerId
+    fileprivate var value: StoredPeerChatInterfaceState?
+    
+    init(postbox: PostboxImpl, peerId: PeerId) {
+        self.peerId = peerId
+        
+        self.reload(postbox: postbox)
+    }
+    
+    private func reload(postbox: PostboxImpl) {
+        self.value = postbox.peerChatInterfaceStateTable.get(self.peerId)
+    }
+    
+    func replay(postbox: PostboxImpl, transaction: PostboxTransaction) -> Bool {
+        var updated = false
+        
+        if transaction.currentUpdatedPeerChatListEmbeddedStates.contains(self.peerId) {
+            let previousValue = self.value
+            self.reload(postbox: postbox)
+            if previousValue != self.value {
+                updated = true
+            }
+        }
+        
+        return updated
+    }
+
+    func refreshDueToExternalTransaction(postbox: PostboxImpl) -> Bool {
+        self.reload(postbox: postbox)
+        
+        return true
+    }
+    
+    func immutableView() -> PostboxView {
+        return ChatInterfaceStateView(self)
+    }
+}
+
+public final class ChatInterfaceStateView: PostboxView {
+    public let value: StoredPeerChatInterfaceState?
+    
+    init(_ view: MutableChatInterfaceStateView) {
+        self.value = view.value
+    }
+}