pop to root on tabbar tap

IceCubesApp/App/IceCubesApp.swift

@@ -6,37 +6,59 @@ import Env
 
 @main
 struct IceCubesApp: App {
+  enum Tab: Int {
+    case timeline, notifications, explore, account, settings, other
+  }
+  
   public static let defaultServer = "mastodon.social"
   
   @StateObject private var appAccountsManager = AppAccountsManager()
   @StateObject private var currentAccount = CurrentAccount()
   @StateObject private var quickLook = QuickLook()
+  @State private var selectedTab: Tab = .timeline
+  @State private var popToRootTab: Tab = .other
   
   var body: some Scene {
     WindowGroup {
-      TabView {
+      TabView(selection: .init(get: {
-        TimelineTab()
+        selectedTab
+      }, set: { newTab in
+        if newTab == selectedTab {
+          /// Stupid hack to trigger onChange binding in tab views.
+          popToRootTab = .other
+          DispatchQueue.main.asyncAfter(deadline: .now() + 0.01) {
+            popToRootTab = selectedTab
+          }
+        }
+        selectedTab = newTab
+      })) {
+        TimelineTab(popToRootTab: $popToRootTab)
           .tabItem {
             Label("Timeline", systemImage: "rectangle.on.rectangle")
           }
+          .tag(Tab.timeline)
         if appAccountsManager.currentClient.isAuth {
-          NotificationsTab()
+          NotificationsTab(popToRootTab: $popToRootTab)
             .tabItem {
               Label("Notifications", systemImage: "bell")
             }
-          ExploreTab()
+            .tag(Tab.notifications)
+          ExploreTab(popToRootTab: $popToRootTab)
             .tabItem {
               Label("Explore", systemImage: "magnifyingglass")
             }
-          AccountTab()
+            .tag(Tab.explore)
+          AccountTab(popToRootTab: $popToRootTab)
             .tabItem {
               Label("Profile", systemImage: "person.circle")
             }
+            .tag(Tab.account)
         }
         SettingsTabs()
           .tabItem {
             Label("Settings", systemImage: "gear")
           }
+          .tag(Tab.settings)
       }
       .tint(.brand)
       .onChange(of: appAccountsManager.currentClient) { newClient in

IceCubesApp/App/Tabs/AccountTab.swift

@@ -8,6 +8,7 @@ import Shimmer
 struct AccountTab: View {
   @EnvironmentObject private var currentAccount: CurrentAccount
   @StateObject private var routeurPath = RouterPath()
+  @Binding var popToRootTab: IceCubesApp.Tab
   
   var body: some View {
     NavigationStack(path: $routeurPath.path) {
@@ -22,5 +23,10 @@ struct AccountTab: View {
       }
     }
     .environmentObject(routeurPath)
+    .onChange(of: $popToRootTab.wrappedValue) { popToRootTab in
+      if popToRootTab == .account {
+        routeurPath.path = []
+      }
+    }
   }
 }

IceCubesApp/App/Tabs/ExploreTab.swift

@@ -6,6 +6,7 @@ import Explore
 
 struct ExploreTab: View {
   @StateObject private var routeurPath = RouterPath()
+  @Binding var popToRootTab: IceCubesApp.Tab
   
   var body: some View {
     NavigationStack(path: $routeurPath.path) {
@@ -14,5 +15,10 @@ struct ExploreTab: View {
         .withSheetDestinations(sheetDestinations: $routeurPath.presentedSheet)
     }
     .environmentObject(routeurPath)
+    .onChange(of: $popToRootTab.wrappedValue) { popToRootTab in
+      if popToRootTab == .explore {
+        routeurPath.path = []
+      }
+    }
   }
 }

IceCubesApp/App/Tabs/NotificationTab.swift

@@ -6,6 +6,7 @@ import Notifications
 
 struct NotificationsTab: View {
   @StateObject private var routeurPath = RouterPath()
+  @Binding var popToRootTab: IceCubesApp.Tab
   
   var body: some View {
     NavigationStack(path: $routeurPath.path) {
@@ -14,5 +15,10 @@ struct NotificationsTab: View {
         .withSheetDestinations(sheetDestinations: $routeurPath.presentedSheet)
     }
     .environmentObject(routeurPath)
+    .onChange(of: $popToRootTab.wrappedValue) { popToRootTab in
+      if popToRootTab == .notifications {
+        routeurPath.path = []
+      }
+    }
   }
 }

IceCubesApp/App/Tabs/TimelineTab.swift

@@ -2,10 +2,12 @@ import SwiftUI
 import Timeline
 import Env
 import Network
+import Combine
 
 struct TimelineTab: View {
   @EnvironmentObject private var client: Client
   @StateObject private var routeurPath = RouterPath()
+  @Binding var popToRootTab: IceCubesApp.Tab
   
   var body: some View {
     NavigationStack(path: $routeurPath.path) {
@@ -25,5 +27,10 @@ struct TimelineTab: View {
         }
     }
     .environmentObject(routeurPath)
+    .onChange(of: $popToRootTab.wrappedValue) { popToRootTab in
+      if popToRootTab == .timeline {
+        routeurPath.path = []
+      }
+    }
   }
 }