[Remoting iOS] Basic viewport manipulation support

remoting/client/gesture_interpreter.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef REMOTING_CLIENT_GESTURE_INTERPRETER_H_
+#define REMOTING_CLIENT_GESTURE_INTERPRETER_H_
+
+#include "remoting/client/desktop_viewport.h"
+
+namespace remoting {
+
+// This is a class for interpreting a raw touch input into actions like moving
+// the viewport and injecting mouse clicks.
+class GestureInterpreter {
+ public:
+  GestureInterpreter(
+      const DesktopViewport::TransformationCallback& on_transformation_changed);
+  ~GestureInterpreter();
+
+  // Coordinates of the OpenGL view surface will be used.
+  void Pinch(float pivot_x, float pivot_y, float scale);
+  void Pan(float translation_x, float translation_y);
+  void Tap(float x, float y);
+  void LongPress(float x, float y);
+
+  void OnSurfaceSizeChanged(int width, int height);
+  void OnDesktopSizeChanged(int width, int height);
+
+ private:
+  DesktopViewport viewport_;
+
+  // GestureInterpreter is neither copyable nor movable.
+  GestureInterpreter(const GestureInterpreter&) = delete;
+  GestureInterpreter& operator=(const GestureInterpreter&) = delete;
+};
+
+}  // namespace remoting
+#endif  // REMOTING_CLIENT_GESTURE_INTERPRETER_H_