Add InputEvent and EventPacket types for batched input delivery

content/common/input/event_packet.h

+// Copyright (c) 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 CONTENT_COMMON_INPUT_EVENT_PACKET_H_
+#define CONTENT_COMMON_INPUT_EVENT_PACKET_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+class InputEvent;
+
+// An id'ed sequence of InputEvents.
+class CONTENT_EXPORT EventPacket {
+ public:
+  typedef ScopedVector<InputEvent> InputEvents;
+
+  EventPacket();
+  ~EventPacket();
+
+  // Only a non-NULL and valid |event| will be accepted and added to the packet.
+  // Returns true if |event| was added, and false otherwise.
+  bool Add(scoped_ptr<InputEvent> event);
+
+  void set_id(int64 id) { id_ = id; }
+  int64 id() const { return id_; }
+
+  // Accessor functions for convenience.
+  bool empty() const { return events_.empty(); }
+  size_t size() const { return events_.size(); }
+  InputEvents::const_iterator begin() const { return events_.end(); }
+  InputEvents::const_iterator end() const { return events_.end(); }
+  const InputEvents& events() const { return events_; }
+
+ protected:
+  int64 id_;
+  InputEvents events_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(EventPacket);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_INPUT_EVENT_PACKET_H_