Fix theme preview crossfade

submodules/SettingsUI/Sources/Themes/EditThemeController.swift

@@ -264,6 +264,7 @@ private func editThemeControllerEntries(presentationData: PresentationData, stat
 public func editThemeController(context: AccountContext, mode: EditThemeControllerMode, navigateToChat: ((PeerId) -> Void)? = nil) -> ViewController {
     let initialState: EditThemeControllerState
     let previewThemePromise = Promise<PresentationTheme>()
+    let presentationData = context.sharedContext.currentPresentationData.with { $0 }
     switch mode {
         case let .create(existingTheme):
             let theme: PresentationTheme
@@ -272,7 +273,6 @@ public func editThemeController(context: AccountContext, mode: EditThemeControll
                 theme = existingTheme
                 wallpaper = theme.chat.defaultWallpaper
             } else {
-                let presentationData = context.sharedContext.currentPresentationData.with { $0 }
                 theme = presentationData.theme
                 wallpaper = presentationData.chatWallpaper
             }
@@ -293,7 +293,8 @@ public func editThemeController(context: AccountContext, mode: EditThemeControll
                     previewThemePromise.set(.single(theme.withUpdated(name: nil, defaultWallpaper: info.resolvedWallpaper)))
                 }
             } else {
-                previewThemePromise.set(.single(context.sharedContext.currentPresentationData.with { $0 }.theme))
+                previewThemePromise.set(.single(presentationData.theme.withUpdated(name: "", defaultWallpaper: presentationData.chatWallpaper)))
+                
             }
             initialState = EditThemeControllerState(mode: mode, title: info.theme.title, slug: info.theme.slug, updatedTheme: nil, updating: false)
     }

submodules/SettingsUI/Sources/Themes/ThemeSettingsAccentColorItem.swift

@@ -49,17 +49,17 @@ private enum ThemeSettingsColorEntry: Comparable, Identifiable {
     
     static func <(lhs: ThemeSettingsColorEntry, rhs: ThemeSettingsColorEntry) -> Bool {
         switch lhs {
+            case .picker:
+                return true
             case let .color(lhsIndex, _, _, _):
                 switch rhs {
                     case let .color(rhsIndex, _, _, _):
                         return lhsIndex < rhsIndex
-                    case .picker:
-                        return true
-            }
                     case .picker:
                         return false
             }
         }
+    }
     
     func item(action: @escaping (PresentationThemeAccentColor?, Bool) -> Void, contextAction: ((PresentationThemeAccentColor?, ASDisplayNode, ContextGesture?) -> Void)?, openColorPicker: @escaping (Bool) -> Void) -> ListViewItem {
         switch self {
@@ -460,7 +460,7 @@ private final class ThemeSettingsAccentColorPickerItemNode : ListViewItemNode {
                 if let strongSelf = self {
                     strongSelf.item = item
                     
-                    strongSelf.imageNode.frame = CGRect(origin: CGPoint(x: 9.0, y: 9.0), size: CGSize(width: 42.0, height: 42.0))
+                    strongSelf.imageNode.frame = CGRect(origin: CGPoint(x: 11.0, y: 9.0), size: CGSize(width: 42.0, height: 42.0))
                 }
             })
         }
@@ -701,7 +701,6 @@ class ThemeSettingsAccentColorItemNode: ListViewItemNode, ItemListItemNode {
                     strongSelf.layoutParams = params
                     
                     if themeUpdated {
-                        strongSelf.listNode.backgroundColor = item.theme.list.itemBlocksBackgroundColor
                         strongSelf.backgroundNode.backgroundColor = item.theme.list.itemBlocksBackgroundColor
                         strongSelf.topStripeNode.backgroundColor = item.theme.list.itemBlocksSeparatorColor
                         strongSelf.bottomStripeNode.backgroundColor = item.theme.list.itemBlocksSeparatorColor
@@ -760,6 +759,8 @@ class ThemeSettingsAccentColorItemNode: ListViewItemNode, ItemListItemNode {
                     strongSelf.listNode.transaction(deleteIndices: [], insertIndicesAndItems: [], updateIndicesAndItems: [], options: [.Synchronous], scrollToItem: nil, updateSizeAndInsets: ListViewUpdateSizeAndInsets(size: CGSize(width: contentSize.height, height: contentSize.width), insets: listInsets, duration: 0.0, curve: .Default(duration: nil)), stationaryItemRange: nil, updateOpaqueState: nil, completion: { _ in })
                     
                     var entries: [ThemeSettingsColorEntry] = []
+                    entries.append(.picker)
+                    
                     var index: Int = 0
                     for color in item.colors {
                         switch color {
@@ -782,7 +783,6 @@ class ThemeSettingsAccentColorItemNode: ListViewItemNode, ItemListItemNode {
                         
                         index += 1
                     }
-                    entries.append(.picker)
                     
                     let action: (PresentationThemeAccentColor?, Bool) -> Void = { [weak self] color, selected in
                         if let strongSelf = self, let item = strongSelf.item {
@@ -806,7 +806,7 @@ class ThemeSettingsAccentColorItemNode: ListViewItemNode, ItemListItemNode {
                     }
                     
                     let previousEntries = strongSelf.entries ?? []
-                    let crossfade = themeUpdated || previousEntries.count != entries.count
+                    let crossfade = previousEntries.count != entries.count || (currentItem != nil && currentItem?.themeReference.index != item.themeReference.index)
                     let transition = preparedTransition(action: action, contextAction: contextAction, openColorPicker: openColorPicker, from: previousEntries, to: entries, crossfade: crossfade)
                     strongSelf.enqueueTransition(transition)
                     

submodules/SettingsUI/Sources/Themes/ThemeSettingsController.swift

@@ -343,10 +343,10 @@ private enum ThemeSettingsControllerEntry: ItemListNodeEntry {
                 colorItems.append(contentsOf: colors.map { .color($0) })
                 
                 if let customColors = customColors {
-                    colorItems.append(contentsOf: customColors.colors.map { .custom($0) })
+                    colorItems.insert(contentsOf: customColors.colors.reversed().map { .custom($0) }, at: 0)
                 } else {
                     if let currentColor = currentColor, currentColor.baseColor == .custom {
-                        colorItems.append(.custom(currentColor))
+                        colorItems.insert(.custom(currentColor), at: 0)
                     }
                 }
                 
@@ -610,7 +610,7 @@ public func themeSettingsController(context: AccountContext, focusOnItemTag: The
                 wallpaper = settings.themeSpecificChatWallpapers[reference.index &+ Int64(accentColor.index)]
             }
             if wallpaper == nil {
-                settings.themeSpecificChatWallpapers[reference.index]
+                wallpaper = settings.themeSpecificChatWallpapers[reference.index]
             }
             return (accentColor, wallpaper)
         }
@@ -767,7 +767,7 @@ public func themeSettingsController(context: AccountContext, focusOnItemTag: The
                 wallpaper = settings.themeSpecificChatWallpapers[reference.index &+ Int64(accentColor.index)]
             }
             if wallpaper == nil {
-                settings.themeSpecificChatWallpapers[reference.index]
+                wallpaper = settings.themeSpecificChatWallpapers[reference.index]
             }
             return (accentColor, wallpaper)
         } |> mapToSignal { accentColor, wallpaper -> Signal<(PresentationTheme?, TelegramWallpaper?), NoError> in

submodules/SettingsUI/Sources/Themes/ThemeSettingsThemeItem.swift

@@ -200,6 +200,7 @@ private final class ThemeSettingsThemeItemIconNode : ListViewItemNode {
     private let imageNode: TransformImageNode
     private let overlayNode: ASImageNode
     private let titleNode: TextNode
+    private var snapshotView: UIView?
     
     var item: ThemeSettingsThemeIconItem?
 
@@ -303,6 +304,21 @@ private final class ThemeSettingsThemeItemIconNode : ListViewItemNode {
         }
     }
     
+    func prepareCrossfadeTransition() {
+        self.snapshotView?.removeFromSuperview()
+        
+        if let snapshotView = self.containerNode.view.snapshotView(afterScreenUpdates: false) {
+            self.view.insertSubview(snapshotView, aboveSubview: self.containerNode.view)
+            self.snapshotView = snapshotView
+        }
+    }
+    
+    func animateCrossfadeTransition() {
+        self.snapshotView?.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.3, removeOnCompletion: false, completion: { [weak self] _ in
+            self?.snapshotView?.removeFromSuperview()
+        })
+    }
+    
     override func animateInsertion(_ currentTimestamp: Double, duration: Double, short: Bool) {
         super.animateInsertion(currentTimestamp, duration: duration, short: short)
         
@@ -626,11 +642,23 @@ class ThemeSettingsThemeItemNode: ListViewItemNode, ItemListItemNode {
             self.view.insertSubview(snapshotView, aboveSubview: self.containerNode.view)
             self.snapshotView = snapshotView
         }
+        
+        self.listNode.forEachVisibleItemNode { node in
+            if let node = node as? ThemeSettingsThemeItemIconNode {
+                node.prepareCrossfadeTransition()
+            }
+        }
     }
     
     func animateCrossfadeTransition() {
         self.snapshotView?.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.3, removeOnCompletion: false, completion: { [weak self] _ in
             self?.snapshotView?.removeFromSuperview()
         })
+        
+        self.listNode.forEachVisibleItemNode { node in
+            if let node = node as? ThemeSettingsThemeItemIconNode {
+                node.animateCrossfadeTransition()
+            }
+        }
     }
 }