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

ui/events/ipc/event_param_traits.h

Index: ui/events/ipc/event_param_traits.h
diff --git a/ui/events/ipc/event_param_traits.h b/ui/events/ipc/event_param_traits.h
new file mode 100644
index 0000000000000000000000000000000000000000..d936fc49d9924accfe49734af14439bb02d550ed
--- /dev/null
+++ b/ui/events/ipc/event_param_traits.h
@@ -0,0 +1,95 @@
+// 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 UI_EVENTS_IPC_EVENT_PARAM_TRAITS_H_
+#define UI_EVENTS_IPC_EVENT_PARAM_TRAITS_H_
+
+#include <string>
+
+#include "ui/events/event.h"
+#include "ui/events/gesture_event_details.h"
+#include "ui/events/ipc/event_param_traits_macros.h"
+#include "ui/events/ipc/events_ipc_export.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_;

[sadrul, 2016/02/17 21:05:31]

I think we want to send source_device_id_ and latency_ too (LatencyInfo already
has its param-traits). But we can revisit that later.

[Mark Dittmer, 2016/02/18 14:51:05]

Acknowledged.

+
+template <>
+struct EVENTS_IPC_EXPORT 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 EVENTS_IPC_EXPORT 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 EVENTS_IPC_EXPORT 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  // UI_EVENTS_IPC_EVENT_PARAM_TRAITS_H_