Implement dialpad view controller

Riot/Modules/Common/Presentation/CustomSizedPresentable.swift

@@ -0,0 +1,30 @@
+// 
+// Copyright 2020 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
+
+/// Protocol to be used with a `CustomSizedPresentationController`
+@objc protocol CustomSizedPresentable {
+    
+    /// Custom size for presentable. If not implemented, the presentable will have the both half width and height of the container view.
+    /// - Parameter containerSize: Container view's size.
+    @objc optional func customSize(withParentContainerSize containerSize: CGSize) -> CGSize
+    
+    /// Position (origin) of presentable in container. If not implemented, the presentable will be centered to the container view.
+    /// - Parameter containerSize: Container view's size.
+    @objc optional func position(withParentContainerSize containerSize: CGSize) -> CGPoint
+    
+}