[Tracking Patch] Unified gesture detection

content/browser/renderer_host/input/gestures/motion_event.h

+// Copyright 2014 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 CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURES_MOTION_EVENT_H_
+#define CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURES_MOTION_EVENT_H_
+
+#include "base/time/time.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
+
+namespace content {
+
+// Utility wrapper class for Chromium input events, minimizing the required
+// changes to the gesture detection classes forked from the Android framework.
+class MotionEvent {
+ public:
+  enum Action {
+    ACTION_POINTER_DOWN,
+    ACTION_POINTER_UP,
+    ACTION_DOWN,
+    ACTION_UP,
+    ACTION_CANCEL,
+    ACTION_MOVE,
+    ACTION_TYPE_COUNT
+  };
+
+  explicit MotionEvent(const blink::WebTouchEvent& event);
+  ~MotionEvent();
+
+  Action GetActionMasked() const;
+  size_t GetActionIndex() const;
+  size_t GetPointerCount() const;
+  int GetPointerId(size_t pointer_index) const;
+  float GetX() const { return GetX(0); }
+  float GetY() const { return GetY(0); }
+  float GetX(size_t pointer_index) const;
+  float GetY(size_t pointer_index) const;
+  float GetTouchMajor() const { return GetTouchMajor(0); }
+  float GetTouchMajor(size_t pointer_index) const;
+  base::TimeTicks GetEventTime() const;
+  base::TimeTicks GetDownTime() const;
+
+  size_t GetHistorySize() const;
+  base::TimeTicks GetHistoricalEventTime(size_t historical_index) const;
+  float GetHistoricalTouchMajor(size_t pointer_index,
+                                size_t historical_index) const;
+  float GetHistoricalX(size_t pointer_index, size_t historical_index) const;
+  float GetHistoricalY(size_t pointer_index, size_t historical_index) const;
+
+  // TODO(jdduke): Take a NativeWebTouchEvent that wraps either an Android
+  // MotionEvent directly, or a ui::Event.
+  blink::WebTouchEvent event;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MotionEvent);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURES_MOTION_EVENT_H_