Eager Gesture Recognizer (WIP)

ui/events/gestures/touch_point_state.h

+// Copyright 2013 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 UI_EVENTS_GESTURES_TOUCH_POINT_STATE_H_
+#define UI_EVENTS_GESTURES_TOUCH_POINT_STATE_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_vector.h"
+#include "ui/events/event.h"
+
+namespace ui {
+class TouchEvent;
+
+class EVENTS_EXPORT TouchPointState {
+ public:
+  enum RequiresAck {
+    WAIT_FOR_ACK = 0,
+    NO_ACK
+  };
+
+  TouchPointState(int touch_id);
+  TouchPointState(int touch_id,
+                  bool has_press,
+                  bool has_release,
+                  int move_count,
+                  int timer_count);
+  virtual ~TouchPointState();
+  void Update(const TouchEvent& event);
+  void TimerFired();
+  void Reset();
+
+  // The caller is responsible for deleting the new |TouchPointState|. The new
+  // |TouchPointState| will have timer_count_ set correctly, and will only
+  // report events the associated gesture depends upon. See goo.gl/gZc70m for
+  // details.
+TouchPointState* CopyForGestureType(
+    EventType type, RequiresAck requires_ack) const;
+
+  bool HasEmptyIntersection(const TouchPointState& tps) const;
+  bool Contains(const TouchPointState& tps) const;
+
+  int touch_id() const {return touch_id_; }
+  bool has_press() const { return has_press_; }
+  bool has_release() const { return has_release_; }
+  int move_count() const { return move_count_; }
+  int timer_count() const { return timer_count_; }
+
+  bool operator==(const TouchPointState& tps) const {
+    return touch_id_ == tps.touch_id() &&
+        has_press() == tps.has_press() &&
+        has_release() == tps.has_release() &&
+        move_count() == tps.move_count() &&
+        timer_count() == tps.timer_count();
+  }
+
+ private:
+  TouchPointState(const TouchPointState& tps);
+  TouchPointState Intersect(const TouchPointState& tps) const;
+
+  int touch_id_;
+  bool has_press_;
+  bool has_release_;
+  int move_count_;
+  int timer_count_;
+
+  DISALLOW_ASSIGN(TouchPointState);
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_GESTURES_TOUCH_POINT_STATE_H_