Optimize inline forum navigation

submodules/ChatListUI/Sources/ChatListController.swift

@@ -1933,8 +1933,13 @@ public class ChatListControllerImpl: TelegramBaseController, ChatListController
                     backTitle = self.presentationData.strings.Common_Close
                 }
             }
+            var navigationBackTitle: String?
+            if case .chatList(.archive) = self.location {
+                navigationBackTitle = self.presentationData.strings.Common_Back
+            }
             primaryContent = ChatListHeaderComponent.Content(
                 title: self.plainTitle,
+                navigationBackTitle: navigationBackTitle,
                 titleComponent: primaryContext.chatTitleComponent.flatMap { AnyComponent<Empty>($0) },
                 chatListTitle: primaryContext.chatListTitle,
                 leftButton: primaryContext.leftButton,
@@ -1952,6 +1957,7 @@ public class ChatListControllerImpl: TelegramBaseController, ChatListController
         if let secondaryContext = self.secondaryContext {
             secondaryContent = ChatListHeaderComponent.Content(
                 title: self.plainTitle,
+                navigationBackTitle: nil,
                 titleComponent: secondaryContext.chatTitleComponent.flatMap { AnyComponent<Empty>($0) },
                 chatListTitle: secondaryContext.chatListTitle,
                 leftButton: secondaryContext.leftButton,

submodules/ChatListUI/Sources/ChatListControllerNode.swift

@@ -313,7 +313,7 @@ private final class ChatListContainerItemNode: ASDisplayNode {
     private var shimmerNodeOffset: CGFloat = 0.0
     let listNode: ChatListNode
     
-    private var validLayout: (CGSize, UIEdgeInsets, CGFloat, CGFloat, ChatListControllerLocation?, CGFloat)?
+    private(set) var validLayout: (size: CGSize, insets: UIEdgeInsets, visualNavigationHeight: CGFloat, originalNavigationHeight: CGFloat, inlineNavigationLocation: ChatListControllerLocation?, inlineNavigationTransitionFraction: CGFloat)?
     
     init(context: AccountContext, location: ChatListControllerLocation, filter: ChatListFilter?, previewing: Bool, isInlineMode: Bool, controlsHistoryPreload: Bool, presentationData: PresentationData, animationCache: AnimationCache, animationRenderer: MultiAnimationRenderer, becameEmpty: @escaping (ChatListFilter?) -> Void, emptyAction: @escaping (ChatListFilter?) -> Void, secondaryEmptyAction: @escaping () -> Void) {
         self.context = context
@@ -1129,7 +1129,14 @@ final class ChatListContainerNode: ASDisplayNode, UIGestureRecognizerDelegate {
                 nodeTransition.updateFrame(node: itemNode, frame: itemFrame, completion: { _ in
                 })
                 
-                itemNode.updateLayout(size: layout.size, insets: insets, visualNavigationHeight: visualNavigationHeight, originalNavigationHeight: originalNavigationHeight, inlineNavigationLocation: inlineNavigationLocation, inlineNavigationTransitionFraction: inlineNavigationTransitionFraction, transition: nodeTransition)
+                var itemInlineNavigationTransitionFraction = inlineNavigationTransitionFraction
+                if indexDistance != 0 {
+                    if itemInlineNavigationTransitionFraction != 0.0 || itemInlineNavigationTransitionFraction != 1.0 {
+                        itemInlineNavigationTransitionFraction = itemNode.validLayout?.inlineNavigationTransitionFraction ?? 0.0
+                    }
+                }
+                
+                itemNode.updateLayout(size: layout.size, insets: insets, visualNavigationHeight: visualNavigationHeight, originalNavigationHeight: originalNavigationHeight, inlineNavigationLocation: inlineNavigationLocation, inlineNavigationTransitionFraction: itemInlineNavigationTransitionFraction, transition: nodeTransition)
                 
                 if wasAdded, case .animated = transition {
                     animateSlidingIds.append(id)

submodules/TelegramUI/Components/ChatListHeaderComponent/Sources/ChatListHeaderComponent.swift

@@ -71,6 +71,7 @@ public final class HeaderNetworkStatusComponent: Component {
 public final class ChatListHeaderComponent: Component {
     public final class Content: Equatable {
         public let title: String
+        public let navigationBackTitle: String?
         public let titleComponent: AnyComponent<Empty>?
         public let chatListTitle: NetworkStatusTitle?
         public let leftButton: AnyComponentWithIdentity<NavigationButtonComponentEnvironment>?
@@ -80,6 +81,7 @@ public final class ChatListHeaderComponent: Component {
         
         public init(
             title: String,
+            navigationBackTitle: String?,
             titleComponent: AnyComponent<Empty>?,
             chatListTitle: NetworkStatusTitle?,
             leftButton: AnyComponentWithIdentity<NavigationButtonComponentEnvironment>?,
@@ -88,6 +90,7 @@ public final class ChatListHeaderComponent: Component {
             backPressed: (() -> Void)?
         ) {
             self.title = title
+            self.navigationBackTitle = navigationBackTitle
             self.titleComponent = titleComponent
             self.chatListTitle = chatListTitle
             self.leftButton = leftButton
@@ -100,6 +103,9 @@ public final class ChatListHeaderComponent: Component {
             if lhs.title != rhs.title {
                 return false
             }
+            if lhs.navigationBackTitle != rhs.navigationBackTitle {
+                return false
+            }
             if lhs.titleComponent != rhs.titleComponent {
                 return false
             }
@@ -339,7 +345,7 @@ public final class ChatListHeaderComponent: Component {
                 let totalOffset = titleFrame.minX - backButtonTitleFrame.minX
                 
                 transition.setBounds(view: self.titleOffsetContainer, bounds: CGRect(origin: CGPoint(x: totalOffset * fraction, y: 0.0), size: self.titleOffsetContainer.bounds.size))
-                transition.setAlpha(view: self.titleOffsetContainer, alpha: (1.0 - fraction))
+                transition.setAlpha(view: self.titleOffsetContainer, alpha: pow(1.0 - fraction, 2.0))
             }
         }
         
@@ -359,7 +365,7 @@ public final class ChatListHeaderComponent: Component {
                     let totalOffset = previousTitleFrame.minX - backButtonTitleFrame.minX
                     
                     transition.setBounds(view: backButtonView.titleOffsetContainer, bounds: CGRect(origin: CGPoint(x: -totalOffset * (1.0 - fraction), y: 0.0), size: backButtonView.titleOffsetContainer.bounds.size))
-                    transition.setAlpha(view: backButtonView.titleOffsetContainer, alpha: fraction)
+                    transition.setAlpha(view: backButtonView.titleOffsetContainer, alpha: pow(fraction, 2.0))
                 }
             }
         }
@@ -664,7 +670,7 @@ public final class ChatListHeaderComponent: Component {
                     self.secondaryContentView = secondaryContentView
                     self.addSubview(secondaryContentView)
                 }
-                secondaryContentView.update(context: component.context, theme: component.theme, strings: component.strings, content: secondaryContent, backTitle: component.primaryContent?.title, sideInset: component.sideInset, size: availableSize, transition: secondaryContentTransition)
+                secondaryContentView.update(context: component.context, theme: component.theme, strings: component.strings, content: secondaryContent, backTitle: component.primaryContent?.navigationBackTitle ?? component.primaryContent?.title, sideInset: component.sideInset, size: availableSize, transition: secondaryContentTransition)
                 secondaryContentTransition.setFrame(view: secondaryContentView, frame: CGRect(origin: CGPoint(), size: availableSize))
                 
                 if let primaryContentView = self.primaryContentView {