4850 bring leaving space experience in line with web (#6062)

* Bring leaving space experience in line with Web #4850

- Done

RiotSwiftUI/Modules/Spaces/MatrixItemChooser/Service/MatrixSDK/MatrixItemChooserDirectChildrenDataSource.swift

@@ -0,0 +1,50 @@
+// 
+// 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
+
+class MatrixItemChooserDirectChildrenDataSource: MatrixItemChooserDataSource {
+    
+    // MARK: - Private
+    
+    private let parentId: String
+
+    // MARK: - Setup
+    
+    init(parentId: String) {
+        self.parentId = parentId
+    }
+
+    // MARK: - MatrixItemChooserDataSource
+    
+    var preselectedItemIds: Set<String>? { nil }
+
+    func sections(with session: MXSession, completion: @escaping (Result<[MatrixListItemSectionData], Error>) -> Void) {
+        let space = session.spaceService.getSpace(withId: parentId)
+        let children: [MatrixListItemData] = space?.childRoomIds.compactMap({ roomId in
+            guard let room = session.room(withRoomId: roomId), !room.isDirect else {
+                return nil
+            }
+            
+            return MatrixListItemData(mxRoom: room, spaceService: session.spaceService)
+        }) ?? []
+        completion(Result(catching: {
+            [
+                MatrixListItemSectionData(items: children)
+            ]
+        }))
+    }
+}

RiotSwiftUI/Modules/Spaces/MatrixItemChooser/Service/MatrixSDK/MatrixItemChooserService.swift

@@ -61,6 +61,13 @@ class MatrixItemChooserService: MatrixItemChooserServiceProtocol {
     var loadingText: String? {
         itemsProcessor.loadingText
     }
+    var itemCount: Int {
+        var itemCount = 0
+        for section in sections {
+            itemCount += section.items.count
+        }
+        return itemCount
+    }
 
     // MARK: - Setup
     
@@ -118,6 +125,22 @@ class MatrixItemChooserService: MatrixItemChooserServiceProtocol {
             }
         }
     }
+    
+    func selectAllItems() {
+        var newSelection: Set<String> = Set()
+        for section in sections {
+            for item in section.items {
+                newSelection.insert(item.id)
+            }
+        }
+        self.selectedItemIds = newSelection
+        selectedItemIdsSubject.send(selectedItemIds)
+    }
+    
+    func deselectAllItems() {
+        self.selectedItemIds = Set()
+        selectedItemIdsSubject.send(selectedItemIds)
+    }
 
     // MARK: - Private