better new chat animation

ios/Packages/Sybil/Sources/Sybil/SybilWorkspaceView.swift

@@ -15,8 +15,10 @@ struct SybilWorkspaceView: View {
     @State private var photoPickerItems: [PhotosPickerItem] = []
     @State private var isComposerDropTargeted = false
     @State private var newChatSwipeOffset: CGFloat = 0
+    @State private var newChatSwipeCompletionOffset: CGFloat = 0
     @State private var newChatSwipeContainerWidth: CGFloat = NewChatSwipeMetrics.referenceWidth
     @State private var newChatSwipeIsActive = false
+    @State private var newChatSwipeIsCompleting = false
     @State private var newChatSwipeHasLatched = false
     @State private var newChatSwipeDidTriggerHaptic = false
     @State private var newChatSwipeFeedbackGenerator: UIImpactFeedbackGenerator?
@@ -55,9 +57,17 @@ struct SybilWorkspaceView: View {
         return true
     }
 
+    private var canRecognizeNewChatSwipe: Bool {
+        canSwipeToCreateChat && !newChatSwipeIsCompleting
+    }
+
+    private var showsNewChatSwipeBackdrop: Bool {
+        canSwipeToCreateChat || newChatSwipeIsCompleting
+    }
+
     var body: some View {
         ZStack(alignment: .trailing) {
-            if canSwipeToCreateChat {
+            if showsNewChatSwipeBackdrop {
                 NewChatSwipeBackdrop(
                     progress: NewChatSwipeMetrics.progress(for: newChatSwipeOffset, width: newChatSwipeContainerWidth),
                     hasLatched: newChatSwipeHasLatched
@@ -72,6 +82,7 @@ struct SybilWorkspaceView: View {
                 .offset(x: newChatSwipeOffset)
                 .blur(radius: NewChatSwipeMetrics.blurRadius(for: newChatSwipeOffset, width: newChatSwipeContainerWidth))
         }
+        .offset(x: newChatSwipeCompletionOffset)
         .background(SybilTheme.background)
         .navigationTitle(viewModel.selectedTitle)
         .navigationBarTitleDisplayMode(.inline)
@@ -134,7 +145,7 @@ struct SybilWorkspaceView: View {
             .frame(maxWidth: .infinity, maxHeight: .infinity)
             .background {
                 NewChatSwipePanInstaller(
-                    isEnabled: canSwipeToCreateChat,
+                    isEnabled: canRecognizeNewChatSwipe,
                     onBegan: { width in
                         beginNewChatSwipe(containerWidth: width)
                     },
@@ -209,16 +220,34 @@ struct SybilWorkspaceView: View {
         updateNewChatSwipe(with: translationX, containerWidth: containerWidth)
 
         if didFinish && newChatSwipeHasLatched {
-            onRequestNewChat?()
+            Task {
+                await completeNewChatSwipe(containerWidth: containerWidth)
+            }
+            return
         }
 
         resetNewChatSwipe(animated: true)
     }
 
+    @MainActor
+    private func completeNewChatSwipe(containerWidth: CGFloat) async {
+        newChatSwipeIsCompleting = true
+
+        withAnimation(.easeIn(duration: NewChatSwipeMetrics.completionAnimationDuration)) {
+            newChatSwipeCompletionOffset = -(containerWidth + NewChatSwipeMetrics.completionOvershoot)
+        }
+
+        try? await Task.sleep(for: .milliseconds(NewChatSwipeMetrics.completionAnimationDelayMs))
+        onRequestNewChat?()
+        resetNewChatSwipe(animated: false)
+    }
+
     private func resetNewChatSwipe(animated: Bool) {
         let reset = {
             newChatSwipeOffset = 0
+            newChatSwipeCompletionOffset = 0
             newChatSwipeIsActive = false
+            newChatSwipeIsCompleting = false
             newChatSwipeHasLatched = false
             newChatSwipeDidTriggerHaptic = false
         }
@@ -443,11 +472,9 @@ struct SybilWorkspaceView: View {
             Button("Files") {
                 isShowingFileImporter = true
             }
-            if canPasteFromClipboard {
-                Button("Paste from Clipboard") {
-                    Task {
-                        await pasteAttachmentsFromClipboard()
-                    }
+            Button("Paste from Clipboard") {
+                Task {
+                    await pasteAttachmentsFromClipboard()
                 }
             }
             Button("Cancel", role: .cancel) {}
@@ -500,20 +527,6 @@ struct SybilWorkspaceView: View {
         }
     }
 
-    private var canPasteFromClipboard: Bool {
-        let pasteboard = UIPasteboard.general
-        if pasteboard.hasImages {
-            return true
-        }
-        if let url = pasteboard.url, url.isFileURL {
-            return true
-        }
-        if let string = pasteboard.string, !string.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
-            return true
-        }
-        return false
-    }
-
     @MainActor
     private func importAttachmentsFromItemProviders(_ providers: [NSItemProvider]) async {
         do {
@@ -558,6 +571,11 @@ struct SybilWorkspaceView: View {
                 attachments.append(try SybilChatAttachmentSupport.buildTextAttachment(text: text))
             }
 
+            guard !attachments.isEmpty else {
+                viewModel.errorMessage = "Clipboard does not contain a supported attachment."
+                return
+            }
+
             try viewModel.appendComposerAttachments(attachments)
             composerFocused = true
         } catch {
@@ -573,6 +591,9 @@ enum NewChatSwipeMetrics {
     static let directionDominanceRatio: CGFloat = 1.22
     static let minimumLeftwardVelocity: CGFloat = 55
     static let latchHysteresis: CGFloat = 32
+    static let completionOvershoot: CGFloat = 180
+    static let completionAnimationDuration = 0.24
+    static let completionAnimationDelayMs: UInt64 = 240
 
     static func maxTravel(for width: CGFloat) -> CGFloat {
         min(max(width * 0.46, 156), 240)