Refactor ComposeView to use a single List for everything

Tusker.xcodeproj/project.pbxproj

@@ -152,6 +152,7 @@
 		D667E5F82135C3040057A976 /* Mastodon+Equatable.swift in Sources */ = {isa = PBXBuildFile; fileRef = D667E5F72135C3040057A976 /* Mastodon+Equatable.swift */; };
 		D66A77BB233838DC0058F1EC /* UIFont+Traits.swift in Sources */ = {isa = PBXBuildFile; fileRef = D66A77BA233838DC0058F1EC /* UIFont+Traits.swift */; };
 		D66C900B28DAB7FD00217BF2 /* TimelineViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D66C900A28DAB7FD00217BF2 /* TimelineViewController.swift */; };
+		D673ACCE2919E74200D6F8B0 /* MenuPicker.swift in Sources */ = {isa = PBXBuildFile; fileRef = D673ACCD2919E74200D6F8B0 /* MenuPicker.swift */; };
 		D674A50927F9128D00BA03AC /* Pachyderm in Frameworks */ = {isa = PBXBuildFile; productRef = D674A50827F9128D00BA03AC /* Pachyderm */; };
 		D677284824ECBCB100C732D3 /* ComposeView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D677284724ECBCB100C732D3 /* ComposeView.swift */; };
 		D677284A24ECBDF400C732D3 /* ComposeCurrentAccount.swift in Sources */ = {isa = PBXBuildFile; fileRef = D677284924ECBDF400C732D3 /* ComposeCurrentAccount.swift */; };
@@ -507,6 +508,7 @@
 		D667E5F72135C3040057A976 /* Mastodon+Equatable.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Mastodon+Equatable.swift"; sourceTree = "<group>"; };
 		D66A77BA233838DC0058F1EC /* UIFont+Traits.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIFont+Traits.swift"; sourceTree = "<group>"; };
 		D66C900A28DAB7FD00217BF2 /* TimelineViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TimelineViewController.swift; sourceTree = "<group>"; };
+		D673ACCD2919E74200D6F8B0 /* MenuPicker.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MenuPicker.swift; sourceTree = "<group>"; };
 		D674A50727F910F300BA03AC /* Pachyderm */ = {isa = PBXFileReference; lastKnownFileType = wrapper; path = Pachyderm; sourceTree = "<group>"; };
 		D677284724ECBCB100C732D3 /* ComposeView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ComposeView.swift; sourceTree = "<group>"; };
 		D677284924ECBDF400C732D3 /* ComposeCurrentAccount.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ComposeCurrentAccount.swift; sourceTree = "<group>"; };
@@ -1289,6 +1291,7 @@
 				D620483323D3801D008A63EF /* LinkTextView.swift */,
 				D61A45E728DF477D002BE511 /* LoadingCollectionViewCell.swift */,
 				D6262C9928D01C4B00390C1F /* LoadingTableViewCell.swift */,
+				D673ACCD2919E74200D6F8B0 /* MenuPicker.swift */,
 				D68E6F58253C9969001A1B4C /* MultiSourceEmojiLabel.swift */,
 				D627943A23A55BA600D38C68 /* NavigableTableViewCell.swift */,
 				D627943123A5466600D38C68 /* SelectableTableViewCell.swift */,
@@ -1853,6 +1856,7 @@
 				D627FF7B217E951500CC0648 /* DraftsTableViewController.swift in Sources */,
 				D6403CC224A6B72D00E81C55 /* VisualEffectImageButton.swift in Sources */,
 				D6531DEE246B81C9000F9538 /* GifvAttachmentView.swift in Sources */,
+				D673ACCE2919E74200D6F8B0 /* MenuPicker.swift in Sources */,
 				D6370B9C24421FF30092A7FF /* Tusker.xcdatamodeld in Sources */,
 				D6A3BC8F2321FFB900FD64D5 /* StatusActionAccountListTableViewController.swift in Sources */,
 				D6AEBB4823216B1D00E5038B /* AccountActivity.swift in Sources */,

Tusker/Screens/Compose/ComposeAttachmentRow.swift

@@ -14,7 +14,6 @@ import Vision
 struct ComposeAttachmentRow: View {
     @ObservedObject var draft: Draft
     @ObservedObject var attachment: CompositionAttachment
-    let heightChanged: (CGFloat) -> Void
     
     @EnvironmentObject var uiState: ComposeUIState
     @State private var mode: Mode = .allowEntry
@@ -47,7 +46,6 @@ struct ComposeAttachmentRow: View {
             switch mode {
             case .allowEntry:
                 ComposeTextView(text: $attachment.attachmentDescription, placeholder: Text("Describe for the visually impaired…"), minHeight: 80)
-                    .heightDidChange(self.heightChanged)
                     .backgroundColor(.clear)
                 
             case .recognizingText:

Tusker/Screens/Compose/ComposeAttachmentsList.swift

@@ -18,23 +18,17 @@ struct ComposeAttachmentsList: View {
     @EnvironmentObject var uiState: ComposeUIState
     @State var isShowingAssetPickerPopover = false
     @State var isShowingCreateDrawing = false
-    @State var rowHeights = [UUID: CGFloat]()
     
     @Environment(\.colorScheme) var colorScheme: ColorScheme
     @Environment(\.horizontalSizeClass) var horizontalSizeClass: UserInterfaceSizeClass?
     
     var body: some View {
-        List {
+        Group {
             ForEach(draft.attachments) { (attachment) in
                 ComposeAttachmentRow(
                     draft: draft,
                     attachment: attachment
-                ) { (newHeight) in
+                )
-                    // in case height changed callback is called after atachment is removed but before view hierarchy is updated
-                    if draft.attachments.contains(where: { $0.id == attachment.id }) {
-                        rowHeights[attachment.id] = newHeight
-                    }
-                }
                 .listRowInsets(EdgeInsets(top: cellPadding / 2, leading: cellPadding / 2, bottom: cellPadding / 2, trailing: cellPadding / 2))
                 .onDrag { NSItemProvider(object: attachment) }
             }
@@ -69,12 +63,7 @@ struct ComposeAttachmentsList: View {
             .frame(height: cellHeight / 2)
             .listRowInsets(EdgeInsets(top: cellPadding / 2, leading: cellPadding / 2, bottom: cellPadding / 2, trailing: cellPadding / 2))
         }
-        .listStyle(PlainListStyle())
-        // todo: scrollDisabled doesn't remove the need for manually calculating the frame height
-        .frame(height: totalListHeight)
-        .scrollDisabledIfAvailable(totalHeight: totalListHeight)
         .onAppear(perform: self.didAppear)
-        .onReceive(draft.$attachments, perform: self.attachmentsChanged)
     }
     
     private var addButtonImageName: String {
@@ -104,13 +93,6 @@ struct ComposeAttachmentsList: View {
         }
     }
     
-    private var totalListHeight: CGFloat {
-        let totalRowHeights = rowHeights.values.reduce(0, +)
-        let totalPadding = CGFloat(draft.attachments.count) * cellPadding
-        let addButtonHeight = 3 * (cellHeight / 2 + cellPadding)
-        return totalRowHeights + totalPadding + addButtonHeight
-    }
-    
     private func didAppear() {
         if #available(iOS 16.0, *) {
             // these appearance proxy hacks are no longer necessary
@@ -122,17 +104,6 @@ struct ComposeAttachmentsList: View {
         }
     }
     
-    private func attachmentsChanged(attachments: [CompositionAttachment]) {
-        var copy = rowHeights
-        for k in copy.keys where !attachments.contains(where: { k == $0.id }) {
-            copy.removeValue(forKey: k)
-        }
-        for attachment in attachments where !copy.keys.contains(attachment.id) {
-            copy[attachment.id] = cellHeight
-        }
-        self.rowHeights = copy
-    }
-    
     private func assetPickerPopover() -> some View {
         ComposeAssetPicker(draft: draft, delegate: uiState.delegate?.assetPickerDelegate)
             .onDisappear {
@@ -214,16 +185,6 @@ fileprivate extension View {
             self
         }
     }
-    
-    @available(iOS, obsoleted: 16.0)
-    @ViewBuilder
-    func scrollDisabledIfAvailable(totalHeight: CGFloat) -> some View {
-        if #available(iOS 16.0, *) {
-            self.scrollDisabled(true)
-        } else {
-            self.frame(height: totalHeight)
-        }
-    }
 }
 
 @available(iOS 16.0, *)

Tusker/Screens/Compose/ComposeHostingController.swift

@@ -428,6 +428,10 @@ extension ComposeHostingController: UIAdaptivePresentationControllerDelegate {
     func presentationControllerShouldDismiss(_ presentationController: UIPresentationController) -> Bool {
         return Preferences.shared.automaticallySaveDrafts || !draft.hasContent
     }
+    
+    func presentationControllerWillDismiss(_ presentationController: UIPresentationController) {
+        UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: self, for: nil)
+    }
 
     func presentationControllerDidAttemptToDismiss(_ presentationController: UIPresentationController) {
         uiState.isShowingSaveDraftSheet = true

Tusker/Screens/Compose/ComposePollView.swift

@@ -44,6 +44,7 @@ struct ComposePollView: View {
                         .imageScale(.small)
                         .padding(4)
                 }
+                .buttonStyle(.plain)
                 .accentColor(buttonForegroundColor)
                 .background(Circle().foregroundColor(buttonBackgroundColor))
                 .hoverEffect()
@@ -52,31 +53,22 @@ struct ComposePollView: View {
             ForEach(Array(poll.options.enumerated()), id: \.element.id) { (e) in
                 ComposePollOption(poll: poll, option: e.element, optionIndex: e.offset)
             }
-            .transition(.slide)
             
             Button(action: self.addOption) {
                 Label("Add Option", systemImage: "plus")
             }
-
+            .buttonStyle(.borderless)
+            
             HStack {
-                // use .animation(nil) on pickers so frame doesn't have a size change animation when the text changes
+                MenuPicker(selection: $poll.multiple, options: [
-                // this is deprecated in iOS 15, but using .animation(nil, value: poll.multiple) does not work (it still animates)
+                    .init(title: "Allow multiple", value: true),
-                // nor does setting that on the Text rather than the Picker
+                    .init(title: "Single choice", value: false),
-                Picker(selection: $poll.multiple, label: Text(poll.multiple ? "Allow multiple choice" : "Single choice")) {
+                ])
-                    Text("Allow multiple choices").tag(true)
-                    Text("Single choice").tag(false)
-                }
-                .animation(nil)
-                .pickerStyle(MenuPickerStyle())
                 .frame(maxWidth: .infinity)
                 
-                Picker(selection: $duration, label: Text(verbatim: ComposePollView.formatter.string(from: duration.timeInterval)!)) {
+                MenuPicker(selection: $duration, options: Duration.allCases.map {
-                    ForEach(Duration.allCases, id: \.self) { (duration) in
+                    .init(title: ComposePollView.formatter.string(from: $0.timeInterval)!, value: $0)
-                        Text(ComposePollView.formatter.string(from: duration.timeInterval)!).tag(duration)
+                })
-                    }
-                }
-                .animation(nil)
-                .pickerStyle(MenuPickerStyle())
                 .frame(maxWidth: .infinity)
             }
         }
@@ -110,9 +102,7 @@ struct ComposePollView: View {
     }
     
     private func addOption() {
-        withAnimation(.easeInOut(duration: 0.25)) {
+        poll.options.append(Draft.Poll.Option(""))
-            poll.options.append(Draft.Poll.Option(""))
-        }
     }
 }
 
@@ -163,6 +153,7 @@ struct ComposePollOption: View {
             Button(action: self.removeOption) {
                 Image(systemName: "minus.circle.fill")
             }
+            .buttonStyle(.plain)
             .foregroundColor(poll.options.count == 1 ? .gray : .red)
             .disabled(poll.options.count == 1)
             .hoverEffect()
@@ -175,9 +166,7 @@ struct ComposePollOption: View {
     }
     
     private func removeOption() {
-        _ = withAnimation {
+        poll.options.remove(at: optionIndex)
-            poll.options.remove(at: optionIndex)
-        }
     }
     
     struct Checkbox: View {

Tusker/Screens/Compose/ComposeReplyContentView.swift

@@ -17,18 +17,20 @@ struct ComposeReplyContentView: UIViewRepresentable {
     
     let heightChanged: (CGFloat) -> Void
     
-    func makeUIView(context: Context) -> ComposeReplyContentTextView {
+    func makeUIView(context: Context) -> UIViewType {
         let view = ComposeReplyContentTextView()
         view.overrideMastodonController = mastodonController
         view.setTextFrom(status: status)
         view.isUserInteractionEnabled = false
+        // scroll needs to be enabled, otherwise the text view never reports a contentSize greater than 1 line
+        view.isScrollEnabled = true
         view.backgroundColor = .clear
         view.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
         
         return view
     }
     
-    func updateUIView(_ uiView: ComposeReplyContentTextView, context: Context) {
+    func updateUIView(_ uiView: UIViewType, context: Context) {
         uiView.heightChanged = heightChanged
     }
 }

Tusker/Screens/Compose/ComposeReplyView.swift

@@ -10,7 +10,8 @@ import SwiftUI
 
 struct ComposeReplyView: View {
     let status: StatusMO
-    let stackPadding: CGFloat
+    let rowTopInset: CGFloat
+    let globalFrameOutsideList: CGRect
     
     @State private var displayNameHeight: CGFloat?
     @State private var contentHeight: CGFloat?
@@ -44,9 +45,13 @@ struct ComposeReplyView: View {
                             displayNameHeight = newValue
                         }
                 })
- 
+
                 ComposeReplyContentView(status: status) { newHeight in
-                    contentHeight = newHeight
+                    // otherwise, with long in-reply-to statuses, the main content text view position seems not to update
+                    // and it ends up  partially behind the header
+                    DispatchQueue.main.async {
+                        contentHeight = newHeight
+                    }
                 }
                 .frame(height: contentHeight ?? 0)
             }
@@ -55,20 +60,22 @@ struct ComposeReplyView: View {
     }
     
     private func replyAvatarImage(geometry: GeometryProxy) -> some View {
-        let scrollOffset = -geometry.frame(in: .named(ComposeView.coordinateSpaceOutsideOfScrollView)).minY
+        // using a coordinate space declared outside of the List doesn't work, so we do the math ourselves
+        let globalFrame = geometry.frame(in: .global)
+        let scrollOffset = -(globalFrame.minY - globalFrameOutsideList.minY)
+
+        // add rowTopInset so that the image is always at least rowTopInset away from the top
+        var offset = scrollOffset + rowTopInset
 
-        // add stackPadding so that the image is always at least stackPadding away from the top
-        var offset = scrollOffset + stackPadding
-        
         // offset can never be less than 0 (i.e., above the top of the in-reply-to content)
         offset = max(offset, 0)
         
         // subtract 50, because we care about where the bottom of the view is but the offset is relative to the top of the view
         let maxOffset = max((contentHeight ?? 0) + (displayNameHeight ?? 0) - 50, 0)
-        
+
         // once you scroll past the in-reply-to-content, the bottom of the avatar should be pinned to the bottom of the content
         offset = min(offset, maxOffset)
-        
+
         return ComposeAvatarImageView(url: status.account.avatar)
             .frame(width: 50, height: 50)
             .cornerRadius(preferences.avatarStyle.cornerRadiusFraction * 50)

Tusker/Screens/Compose/ComposeView.swift

@@ -42,12 +42,12 @@ import Combine
 }
 
 struct ComposeView: View {
-    static let coordinateSpaceOutsideOfScrollView = "coordinateSpaceOutsideOfScrollView"
-    
     @ObservedObject var draft: Draft
     @EnvironmentObject var mastodonController: MastodonController
     @EnvironmentObject var uiState: ComposeUIState
     
+    @State private var globalFrameOutsideList: CGRect = .zero
+    
     @OptionalStateObject private var poster: PostService?
     @State private var isShowingPostErrorAlert = false
     @State private var postError: PostService.Error?
@@ -80,11 +80,8 @@ struct ComposeView: View {
     
     var body: some View {
         ZStack(alignment: .top) {
-            ScrollView(.vertical) {
+            mainList
-                mainStack
+                .scrollDismissesKeyboardInteractivelyIfAvailable()
-            }
-            .coordinateSpace(name: ComposeView.coordinateSpaceOutsideOfScrollView)
-            .scrollDismissesKeyboardInteractivelyIfAvailable()
             
             if let poster = poster {
                 // can't use SwiftUI.ProgressView because there's no UIProgressView.Style.bar equivalent, see FB8587149
@@ -93,6 +90,13 @@ struct ComposeView: View {
             
             autocompleteSuggestions
         }
+        .background(GeometryReader { proxy in
+            Color.clear
+                .preference(key: GlobalFrameOutsideListPrefKey.self, value: proxy.frame(in: .global))
+                .onPreferenceChange(GlobalFrameOutsideListPrefKey.self) { frame in
+                    globalFrameOutsideList = frame
+                }
+        })
         .navigationBarTitle("Compose")
         .actionSheet(isPresented: $uiState.isShowingSaveDraftSheet, content: self.saveAndCloseSheet)
         .alert(isPresented: $isShowingPostErrorAlert) {
@@ -120,41 +124,49 @@ struct ComposeView: View {
         .animation(.default, value: uiState.autocompleteState)
     }
     
-    var mainStack: some View {
+    var mainList: some View {
-        VStack(alignment: .leading, spacing: 8) {
+        List {
             if let id = draft.inReplyToID,
                let status = mastodonController.persistentContainer.status(for: id) {
                 ComposeReplyView(
                     status: status,
-                    stackPadding: stackPadding
+                    rowTopInset: 8,
+                    globalFrameOutsideList: globalFrameOutsideList
                 )
+                .listRowInsets(EdgeInsets(top: 8, leading: 8, bottom: 4, trailing: 8))
+                .listRowSeparator(.hidden)
             }
             
             header
+                .listRowInsets(EdgeInsets(top: draft.inReplyToID == nil ? 8 : 4, leading: 8, bottom: 4, trailing: 8))
+                .listRowSeparator(.hidden)
             
             if draft.contentWarningEnabled {
                 ComposeEmojiTextField(text: $draft.contentWarning, placeholder: "Write your warning here")
+                    .listRowInsets(EdgeInsets(top: 4, leading: 8, bottom: 4, trailing: 8))
+                    .listRowSeparator(.hidden)
             }
             
-            MainComposeTextView(
+            MainComposeTextView(draft: draft)
-                draft: draft
+                .listRowInsets(EdgeInsets(top: 4, leading: 8, bottom: 4, trailing: 8))
-            )
+                .listRowSeparator(.hidden)
             
             if let poll = draft.poll {
                 ComposePollView(draft: draft, poll: poll)
-                    .transition(.opacity.combined(with: .asymmetric(insertion: .scale(scale: 0.5, anchor: .leading), removal: .scale(scale: 0.5, anchor: .trailing))))
+                    .listRowInsets(EdgeInsets(top: 4, leading: 8, bottom: 4, trailing: 8))
-                
+                    .listRowSeparator(.hidden)
             }
             
             ComposeAttachmentsList(
                 draft: draft
             )
-            // the list rows provide their own padding, so we cancel out the extra spacing from the VStack
+            .listRowInsets(EdgeInsets(top: 4, leading: 8, bottom: 8, trailing: 8))
-            .padding([.top, .bottom], -8)
         }
+        .animation(.default, value: draft.poll?.options.count)
+        .scrollDismissesKeyboardInteractivelyIfAvailable()
+        .listStyle(.plain)
         .disabled(isPosting)
-        .padding(stackPadding)
+        .padding(.bottom, uiState.autocompleteState != nil ? 46 : 0)
-        .padding(.bottom, uiState.autocompleteState != nil ? 46 : nil)
     }
     
     private var header: some View {
@@ -258,6 +270,13 @@ private extension View {
     }
 }
 
+private struct GlobalFrameOutsideListPrefKey: PreferenceKey {
+    static var defaultValue: CGRect = .zero
+    static func reduce(value: inout CGRect, nextValue: () -> CGRect) {
+        value = nextValue()
+    }
+}
+
 //struct ComposeView_Previews: PreviewProvider {
 //    static var previews: some View {
 //        ComposeView()

Tusker/Screens/Compose/MainComposeTextView.swift

@@ -17,6 +17,10 @@ struct MainComposeTextView: View {
             if Date().formatted(date: .numeric, time: .omitted).starts(with: "3") {
                 return Text("Happy π day!")
             }
+        } else if components.month == 9 && components.day == 5 {
+            // https://weirder.earth/@noracodes/109276419847254552
+            // https://retrocomputing.stackexchange.com/questions/14763/what-warning-was-given-on-attempting-to-post-to-usenet-circa-1990
+            return Text("This program posts news to thousands of machines throughout the entire populated world. Please be sure you know what you are doing.").italic()
         } else if components.month == 9 && components.day == 21 {
             return Text("Do you remember?")
         } else if components.month == 10 && components.day == 31 {

Tusker/Views/MenuPicker.swift

@@ -0,0 +1,58 @@
+//
+//  MenuPicker.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 11/7/22.
+//  Copyright © 2022 Shadowfacts. All rights reserved.
+//
+
+import SwiftUI
+
+struct MenuPicker<Value: Hashable>: View {
+    @Binding var selection: Value
+    let options: [Option]
+    
+    private var selectedOption: Option {
+        options.first(where: { $0.value == selection })!
+    }
+    
+    var body: some View {
+        Menu {
+            ForEach(options, id: \.value) { option in
+                Button {
+                    selection = option.value
+                } label: {
+                    Label(option.title, systemImage: selection == option.value ? "checkmark" : "")
+                }
+            }
+        } label: {
+            // zstack so that the size of the picker is the size of the largest option
+            ZStack {
+                ForEach(options, id: \.value) { option in
+                    HStack {
+                        Text(option.title)
+                        Image(systemName: "chevron.up.chevron.down")
+                    }
+                    .opacity(option.value == selection ? 1 : 0)
+                }
+            }
+        }
+        .menuStyle(.borderlessButton)
+    }
+    
+    struct Option {
+        let title: String
+        let value: Value
+    }
+}
+
+struct MenuPicker_Previews: PreviewProvider {
+    @State static var value = 0
+    static var previews: some View {
+        MenuPicker(selection: $value, options: [
+            .init(title: "Zero", value: 0),
+            .init(title: "One", value: 1),
+            .init(title: "Two", value: 2),
+        ])
+    }
+}