[CRD iOS] Trackpad Input Mode

remoting/client/ui/trackpad_input_strategy.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_UI_TRACKPAD_INPUT_STRATEGY_H_
+#define REMOTING_CLIENT_UI_TRACKPAD_INPUT_STRATEGY_H_
+
+#include "remoting/client/ui/input_strategy.h"
+
+namespace remoting {
+
+// This strategy simulate the trackpad's behavior. It keeps a visible cursor
+// with positions independent of the location of the touch events.
+class TrackpadInputStrategy : public InputStrategy {
+ public:
+  TrackpadInputStrategy(const DesktopViewport& viewport);
+  ~TrackpadInputStrategy() override;
+
+  // InputStrategy overrides.
+  void HandleZoom(const ViewMatrix::Point& pivot,
+                  float scale,
+                  DesktopViewport* viewport) override;
+
+  bool HandlePan(const ViewMatrix::Vector2D& translation,
+                 Gesture simultaneous_gesture,
+                 DesktopViewport* viewport) override;
+
+  void TrackTouchInput(const ViewMatrix::Point& touch_point,
+                       const DesktopViewport& viewport) override;
+
+  ViewMatrix::Point GetCursorPosition() const override;
+
+  ViewMatrix::Vector2D MapScreenVectorToDesktop(
+      const ViewMatrix::Vector2D& delta,
+      const DesktopViewport& viewport) const override;
+
+  float GetFeedbackRadius(InputFeedbackType type) const override;
+
+  bool IsCursorVisible() const override;
+
+ private:
+  ViewMatrix::Point cursor_position_;
+
+  // TrackpadInputStrategy is neither copyable nor movable.
+  TrackpadInputStrategy(const TrackpadInputStrategy&) = delete;
+  TrackpadInputStrategy& operator=(const TrackpadInputStrategy&) = delete;
+};
+
+}  // namespace remoting
+#endif  // REMOTING_CLIENT_UI_TRACKPAD_INPUT_STRATEGY_H_