Timeline Reactions: Emoji picker (#350)

* Screens template

* Loading and parsing

* Gridview

* New json

* Search method

* Unit tests

* Added emoji provider state

* Removed containsIgnoringCase

* Added plus icon, added double tap gesture, dismiss sheet after selecting emoji

* Renamed EmojisProvider to EmojiProvider

* Renamed EmojiPickerScreenScreen

* Extra padding

* Renamed EmojisLoaderProtocol

* Category names

* Moved method into public section of the class

* Return all categories when search string is empty

* Added cancel button and tittle

* Removed empty lines

* Removed swiftlint warning

ElementX/Sources/Screens/EmojiPickerScreen/EmojiPickerScreenCoordinator.swift

@@ -0,0 +1,55 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import SwiftUI
+
+struct EmojiPickerScreenCoordinatorParameters {
+    let emojiProvider: EmojiProviderProtocol
+    let itemId: String
+}
+
+enum EmojiPickerScreenCoordinatorAction {
+    case selectEmoji(emojiId: String, itemId: String)
+}
+
+final class EmojiPickerScreenCoordinator: CoordinatorProtocol {
+    private let parameters: EmojiPickerScreenCoordinatorParameters
+    private var viewModel: EmojiPickerScreenViewModelProtocol
+    
+    var callback: ((EmojiPickerScreenCoordinatorAction) -> Void)?
+    
+    init(parameters: EmojiPickerScreenCoordinatorParameters) {
+        self.parameters = parameters
+        
+        viewModel = EmojiPickerScreenViewModel(emojiProvider: parameters.emojiProvider)
+    }
+    
+    func start() {
+        viewModel.callback = { [weak self] action in
+            guard let self else { return }
+            MXLog.debug("EmojiPickerScreenViewModel did complete with result: \(action).")
+            switch action {
+            case let .selectEmoji(emojiId: emojiId):
+                self.callback?(.selectEmoji(emojiId: emojiId, itemId: self.parameters.itemId))
+            }
+        }
+    }
+    
+    func toPresentable() -> AnyView {
+        AnyView(EmojiPickerScreen(context: viewModel.context)
+            .presentationDetents([.medium, .large]))
+    }
+}

ElementX/Sources/Screens/EmojiPickerScreen/EmojiPickerScreenModels.swift

@@ -0,0 +1,64 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+enum EmojiPickerScreenViewModelAction {
+    case selectEmoji(emojiId: String)
+}
+
+struct EmojiPickerScreenViewState: BindableState {
+    var categories: [EmojiPickerEmojiCategoryViewData]
+}
+
+enum EmojiPickerScreenViewAction {
+    case search(searchString: String)
+    case emojiSelected(emoji: EmojiPickerEmojiViewData)
+}
+
+struct EmojiPickerEmojiCategoryViewData: Identifiable {
+    let id: String
+    let emojis: [EmojiPickerEmojiViewData]
+    
+    var name: String {
+        switch id {
+        case "people":
+            return ElementL10n.emojiPickerPeopleCategory
+        case "nature":
+            return ElementL10n.emojiPickerNatureCategory
+        case "foods":
+            return ElementL10n.emojiPickerFoodsCategory
+        case "activity":
+            return ElementL10n.emojiPickerActivityCategory
+        case "places":
+            return ElementL10n.emojiPickerPlacesCategory
+        case "objects":
+            return ElementL10n.emojiPickerObjectsCategory
+        case "symbols":
+            return ElementL10n.emojiPickerSymbolsCategory
+        case "flags":
+            return ElementL10n.emojiPickerFlagsCategory
+        default:
+            MXLog.failure("Missing translation for emoji category with id \(id)")
+            return ""
+        }
+    }
+}
+
+struct EmojiPickerEmojiViewData: Identifiable {
+    var id: String
+    let value: String
+}

ElementX/Sources/Screens/EmojiPickerScreen/EmojiPickerScreenViewModel.swift

@@ -0,0 +1,68 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import SwiftUI
+
+typealias EmojiPickerScreenViewModelType = StateStoreViewModel<EmojiPickerScreenViewState, EmojiPickerScreenViewAction>
+
+class EmojiPickerScreenViewModel: EmojiPickerScreenViewModelType, EmojiPickerScreenViewModelProtocol {
+    var callback: ((EmojiPickerScreenViewModelAction) -> Void)?
+    
+    private let emojiProvider: EmojiProviderProtocol
+    
+    init(emojiProvider: EmojiProviderProtocol) {
+        let initialViewState = EmojiPickerScreenViewState(categories: [])
+        self.emojiProvider = emojiProvider
+        super.init(initialViewState: initialViewState)
+        loadEmojis()
+    }
+    
+    // MARK: - Public
+    
+    override func process(viewAction: EmojiPickerScreenViewAction) async {
+        switch viewAction {
+        case let .search(searchString: searchString):
+            let categories = await emojiProvider.getCategories(searchString: searchString)
+            state.categories = convert(emojiCategories: categories)
+        case let .emojiSelected(emoji: emoji):
+            callback?(.selectEmoji(emojiId: emoji.id))
+        }
+    }
+    
+    // MARK: - Private
+
+    private func loadEmojis() {
+        Task(priority: .userInitiated) { [weak self] in
+            let categories = await emojiProvider.getCategories(searchString: nil)
+            self?.state.categories = convert(emojiCategories: categories)
+        }
+    }
+    
+    private func convert(emojiCategories: [EmojiCategory]) -> [EmojiPickerEmojiCategoryViewData] {
+        emojiCategories.compactMap { emojiCategory in
+            
+            let emojisViewData: [EmojiPickerEmojiViewData] = emojiCategory.emojis.compactMap { emojiItem in
+                
+                guard let firstSkin = emojiItem.skins.first else {
+                    return nil
+                }
+                return EmojiPickerEmojiViewData(id: emojiItem.id, value: firstSkin.value)
+            }
+            
+            return EmojiPickerEmojiCategoryViewData(id: emojiCategory.id, emojis: emojisViewData)
+        }
+    }
+}

ElementX/Sources/Screens/EmojiPickerScreen/EmojiPickerScreenViewModelProtocol.swift

@@ -0,0 +1,23 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+@MainActor
+protocol EmojiPickerScreenViewModelProtocol {
+    var callback: ((EmojiPickerScreenViewModelAction) -> Void)? { get set }
+    var context: EmojiPickerScreenViewModelType.Context { get }
+}

ElementX/Sources/Screens/EmojiPickerScreen/View/EmojiPickerHeaderView.swift

@@ -0,0 +1,36 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import SwiftUI
+
+struct EmojiPickerHeaderView: View {
+    let title: String
+    
+    var body: some View {
+        HStack {
+            Text(title)
+                .frame(maxWidth: .infinity, alignment: .leading)
+        }
+    }
+}
+
+struct EmojiPickerHeaderView_Previews: PreviewProvider {
+    static var previews: some View {
+        Group {
+            EmojiPickerHeaderView(title: "")
+        }
+    }
+}

ElementX/Sources/Screens/EmojiPickerScreen/View/EmojiPickerScreen.swift

@@ -0,0 +1,59 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import SwiftUI
+
+struct EmojiPickerScreen: View {
+    @ObservedObject var context: EmojiPickerScreenViewModel.Context
+    @State var searchString = ""
+    
+    var body: some View {
+        VStack {
+            Text(ElementL10n.reactions)
+                .padding(.top, 20)
+            EmojiPickerSearchFieldView(searchString: $searchString)
+                .padding(.horizontal, 10)
+            ScrollView {
+                LazyVGrid(columns: [GridItem(.adaptive(minimum: 45))], spacing: 3) {
+                    ForEach(context.viewState.categories) { category in
+                        Section(header: EmojiPickerHeaderView(title: category.name)
+                            .padding(.horizontal, 13)
+                            .padding(.top, 10)) {
+                                ForEach(category.emojis) { emoji in
+                                    Text(emoji.value)
+                                        .frame(width: 45, height: 45)
+                                        .onTapGesture {
+                                            context.send(viewAction: .emojiSelected(emoji: emoji))
+                                        }
+                                }
+                            }
+                    }
+                }
+            }
+        }
+        .onChange(of: searchString) { _ in
+            context.send(viewAction: .search(searchString: searchString))
+        }
+    }
+}
+
+// MARK: - Previews
+
+struct EmojiPickerScreen_Previews: PreviewProvider {
+    static var previews: some View {
+        EmojiPickerScreen(context: EmojiPickerScreenViewModel(emojiProvider: EmojiProvider()).context)
+    }
+}

ElementX/Sources/Screens/EmojiPickerScreen/View/EmojiPickerSearchFieldView.swift

@@ -0,0 +1,45 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import SwiftUI
+
+struct EmojiPickerSearchFieldView: View {
+    @Binding var searchString: String
+    @FocusState private var isSearchFocused: Bool
+    
+    var body: some View {
+        HStack {
+            Image(systemName: "magnifyingglass")
+            TextField(ElementL10n.search, text: $searchString)
+                .focused($isSearchFocused)
+            if isSearchFocused {
+                Spacer()
+                Button {
+                    searchString = ""
+                    isSearchFocused = false
+                } label: {
+                    Text(ElementL10n.actionCancel)
+                }
+            }
+        }
+    }
+}
+
+struct EmojiPickerSearchFieldView_Previews: PreviewProvider {
+    static var previews: some View {
+        EmojiPickerSearchFieldView(searchString: .constant(""))
+    }
+}