Move sliding modal classes.

Riot/Modules/SlidingModal/SlidingModalEmptyViewController.swift

@@ -0,0 +1,51 @@
+/*
+ Copyright 2019 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
+
+/// Empty view controller used to embed a view conforming to `SlidingModalPresentable`.
+final class SlidingModalEmptyViewController: UIViewController {
+    
+    // MARK: - Properties
+    
+    private var modalView: SlidingModalPresentable.ViewType!
+    
+    // MARK: - Setup
+    
+    static func instantiate(with view: SlidingModalPresentable.ViewType) -> SlidingModalEmptyViewController {
+        let viewController = SlidingModalEmptyViewController()
+        viewController.modalView = view
+        return viewController
+    }
+    
+    // MARK: - Life cycle
+    
+    override func loadView() {
+        self.view = self.modalView
+    }
+}
+
+// MARK: - SlidingModalPresentable
+extension SlidingModalEmptyViewController: SlidingModalPresentable {
+    
+    func allowsDismissOnBackgroundTap() -> Bool {
+        return self.modalView.allowsDismissOnBackgroundTap()
+    }
+    
+    func layoutHeightFittingWidth(_ width: CGFloat) -> CGFloat {
+        return self.modalView.layoutHeightFittingWidth(width)
+    }
+}