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]))
+    }
+}