SP2: Adding Rooms to Spaces element-ios#5230

- Implemented designs with new & existing tabs in a bottom sheet
- Replaced rough edge warnings from space panel overflow with working journeys

RiotSwiftUI/Modules/Spaces/MatrixItemChooser/MockMatrixItemChooserScreenState.swift

@@ -0,0 +1,57 @@
+// 
+// Copyright 2021 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
+import SwiftUI
+
+/// Using an enum for the screen allows you define the different state cases with
+/// the relevant associated data for each case.
+@available(iOS 14.0, *)
+enum MockMatrixItemChooserScreenState: MockScreenState, CaseIterable {
+    // A case for each state you want to represent
+    // with specific, minimal associated data that will allow you
+    // mock that screen.
+    case noItems
+    case items
+    case selectedItems
+    
+    /// The associated screen
+    var screenType: Any.Type {
+        MatrixItemChooserType.self
+    }
+    
+    /// Generate the view struct for the screen state.
+    var screenView: ([Any], AnyView) {
+        let service: MockMatrixItemChooserService
+        switch self {
+        case .noItems:
+            service = MockMatrixItemChooserService(type: .room, items: [])
+        case .items:
+            service = MockMatrixItemChooserService()
+        case .selectedItems:
+            service = MockMatrixItemChooserService(type: .room, items: MockMatrixItemChooserService.mockItems, selectedItemIndexes: [0, 2])
+        }
+        let viewModel = MatrixItemChooserViewModel.makeMatrixItemChooserViewModel(matrixItemChooserService: service, title: "Some title", detail: "Detail text describing the current screen")
+        
+        // can simulate service and viewModel actions here if needs be.
+        
+        return (
+            [service, viewModel],
+            AnyView(MatrixItemChooser(viewModel: viewModel.context)
+                .addDependency(MockAvatarService.example))
+        )
+    }
+}