Threaded timeline composer

2026-11-02 12:07:55 +00:00 · 2025-05-30 16:15:17 +03:00
parent c6c32079f6
commit 9804be70eb
9 changed files with 185 additions and 45 deletions
@@ -9,15 +9,96 @@ import Compound
 import SwiftUI

 struct ThreadTimelineScreen: View {
-    @ObservedObject var context: ThreadTimelineScreenViewModel.Context
-    @ObservedObject var timelineContext: TimelineViewModel.Context
+    @ObservedObject private var context: ThreadTimelineScreenViewModelType.Context
+    @ObservedObject private var timelineContext: TimelineViewModelType.Context
+    @ObservedObject private var composerToolbarContext: ComposerToolbarViewModelType.Context
+    @State private var dragOver = false
+    private let composerToolbar: ComposerToolbar
+    
+    init(context: ThreadTimelineScreenViewModelType.Context,
+         timelineContext: TimelineViewModelType.Context,
+         composerToolbar: ComposerToolbar) {
+        self.context = context
+        self.timelineContext = timelineContext
+        self.composerToolbar = composerToolbar
+        composerToolbarContext = composerToolbar.context
+    }
        
    var body: some View {
        TimelineView(timelineContext: timelineContext)
            .navigationTitle("Thread")
            .navigationBarTitleDisplayMode(.inline)
            .background(.compound.bgCanvasDefault)
-            .interactiveDismissDisabled()
+            .toolbarBackground(.visible, for: .navigationBar) // Fix the toolbar's background.
            .timelineMediaPreview(viewModel: $context.mediaPreviewViewModel)
+            .overlay(alignment: .bottomTrailing) {
+                scrollToBottomButton
+            }
+            .safeAreaInset(edge: .bottom, spacing: 0) {
+                composer
+                    .padding(.bottom, composerToolbarContext.composerFormattingEnabled ? 8 : 12)
+                    .background {
+                        if composerToolbarContext.composerFormattingEnabled {
+                            RoundedRectangle(cornerRadius: 20)
+                                .stroke(Color.compound.borderInteractiveSecondary, lineWidth: 0.5)
+                                .ignoresSafeArea()
+                        }
+                    }
+                    .padding(.top, 8)
+                    .background(Color.compound.bgCanvasDefault.ignoresSafeArea())
+                    .environmentObject(timelineContext)
+                    .environment(\.timelineContext, timelineContext)
+                    // Make sure the reply header honours the hideTimelineMedia setting too.
+                    .environment(\.shouldAutomaticallyLoadImages, !timelineContext.viewState.hideTimelineMedia)
+            }
+            .onDrop(of: ["public.item", "public.file-url"], isTargeted: $dragOver) { providers -> Bool in
+                guard let provider = providers.first,
+                      provider.isSupportedForPasteOrDrop else {
+                    return false
+                }
+                
+                timelineContext.send(viewAction: .handlePasteOrDrop(provider: provider))
+                return true
+            }
+    }
+    
+    @ViewBuilder
+    private var composer: some View {
+        #warning("Check permissions here too")
+//        if roomContext.viewState.canSendMessage {
+        composerToolbar
+//        } else {
+//            Text(L10n.screenRoomTimelineNoPermissionToPost)
+//                .font(.compound.bodyLG)
+//                .foregroundStyle(.compound.textDisabled)
+//                .multilineTextAlignment(.center)
+//                .padding(.vertical, 10) // Matches the MessageComposerStyleModifier
+//        }
+    }
+    
+    private var scrollToBottomButton: some View {
+        Button { timelineContext.send(viewAction: .scrollToBottom) } label: {
+            Image(systemName: "chevron.down")
+                .font(.compound.bodyLG)
+                .fontWeight(.semibold)
+                .foregroundColor(.compound.iconSecondary)
+                .padding(13)
+                .offset(y: 1)
+                .background {
+                    Circle()
+                        .fill(Color.compound.iconOnSolidPrimary)
+                        // Intentionally using system primary colour to get white/black.
+                        .shadow(color: .primary.opacity(0.33), radius: 2.0)
+                }
+                .padding()
+        }
+        .opacity(isAtBottomAndLive ? 0.0 : 1.0)
+        .accessibilityHidden(isAtBottomAndLive)
+        .animation(.elementDefault, value: isAtBottomAndLive)
+        .accessibilityIdentifier(A11yIdentifiers.roomScreen.scrollToBottom)
+    }
+    
+    private var isAtBottomAndLive: Bool {
+        timelineContext.isScrolledToBottom && timelineContext.viewState.timelineState.isLive
    }
 }