IPC::ParamTraits for ui::Event (towards ui::Events over mojo IPC)

components/mus/common/event_param_traits.h

+// Copyright (c) 2016 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 COMPONENTS_MUS_COMMON_EVENT_PARAM_TRAITS_H_
+#define COMPONENTS_MUS_COMMON_EVENT_PARAM_TRAITS_H_
+
+#include <string>
+
+#include "components/mus/common/event_param_traits_macros.h"
+#include "ui/events/event.h"
+#include "ui/events/gesture_event_details.h"
+
+namespace base {
+class Pickle;
+class PickleIterator;
+}
+
+namespace ui {
+class Event;
+}
+
+namespace IPC {
+
+// Non-serialized data:
+//
+// Some event data only makes sense and/or is needed in the context where the
+// raw event came from. As such, some data are explicitly NOT
+// serialized. These data are as follows:
+//   base::NativeEvent native_event_;
+//   LatencyInfo* latency_;
+//   int source_device_id_;
+
+template <>
+struct ParamTraits<ui::ScopedEvent> {
+  typedef ui::ScopedEvent param_type;
+  static void GetSize(base::PickleSizer* s, const param_type& p);
+  static void Write(base::Pickle* m, const param_type& p);
+  static bool Read(const base::Pickle* m,
+                   base::PickleIterator* iter,
+                   param_type* p);
+  static void Log(const param_type& p, std::string* l);
+
+  static void SizeEvent(ui::EventType type,
+                        base::TimeDelta time_stamp,
+                        int flags,
+                        base::PickleSizer* s,
+                        const ui::ScopedEvent& p);
+  static void WriteEvent(ui::EventType type,
+                         base::TimeDelta time_stamp,
+                         int flags,
+                         base::Pickle* m,
+                         const ui::ScopedEvent& p);
+  static bool ReadEvent(ui::EventType type,
+                        base::TimeDelta time_stamp,
+                        int flags,
+                        const base::Pickle* m,
+                        base::PickleIterator* iter,
+                        ui::ScopedEvent* p);
+  static void LogEvent(ui::EventType type,
+                       base::TimeDelta time_stamp,
+                       int flags,
+                       const ui::ScopedEvent& p,
+                       std::string* l);
+};
+
+// Manually implements no-op implementation for ui::CancelModeEvent because IPC
+// BEGIN/END macros with no MEMBER or PARENT in between cause compiler
+// errors.
+template <>
+struct ParamTraits<ui::CancelModeEvent> {
+  typedef ui::CancelModeEvent param_type;
+  static void GetSize(base::PickleSizer* s, const param_type& p);
+  static void Write(base::Pickle* m, const param_type& p);
+  static bool Read(const base::Pickle* m,
+                   base::PickleIterator* iter,
+                   param_type* p);
+  static void Log(const param_type& p, std::string* l);
+};
+
+template <>
+struct ParamTraits<ui::GestureEventDetails::Details> {
+  typedef ui::GestureEventDetails::Details param_type;
+  static void GetSize(base::PickleSizer* s, const param_type& p);
+  static void Write(base::Pickle* m, const param_type& p);
+  static bool Read(const base::Pickle* m,
+                   base::PickleIterator* iter,
+                   param_type* p);
+  static void Log(const param_type& p, std::string* l);
+};
+
+}  // namespace IPC
+
+#endif  // COMPONENTS_MUS_COMMON_EVENT_PARAM_TRAITS_H_