Consolidate/cleanup event cracking code; single out GdkEvents.

views/native_types.h

-// Copyright (c) 2011 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 VIEWS_NATIVE_TYPES_H_
-#define VIEWS_NATIVE_TYPES_H_
-#pragma once
-
-#include "ui/gfx/native_widget_types.h"
-
-#if defined(OS_LINUX)
-typedef union _GdkEvent GdkEvent;
-#endif
-#if defined(USE_X11)
-typedef union _XEvent XEvent;
-#endif
-#if defined(USE_WAYLAND)
-namespace ui {
-union WaylandEvent;
-}
-#endif
-
-#if defined(USE_AURA)
-namespace aura {
-class Event;
-}
-#endif
-
-namespace views {
-
-// A note about NativeEvent and NativeEvent2.
-// 1. Eventually TOOLKIT_VIEWS will converge on using XEvent as we remove
-//    Gtk/Gdk from the stack.
-// 2. TOUCH_UI needs XEvents now for certain event types.
-// 3. TOUCH_UI also needs GdkEvents for certain event types.
-//
-//    => NativeEvent and NativeEvent2.
-//
-// Once we replace usage of Gtk/Gdk types with Xlib types across the board in
-// views, we can remove NativeEvent2 and typedef XEvent* to NativeEvent. The
-// world will then be beautiful(ish).
-
-#if defined(USE_AURA)
-typedef aura::Event* NativeEvent;
-#elif defined(OS_WIN)
-typedef MSG NativeEvent;
-#elif defined(OS_LINUX)
-
-#if defined(USE_WAYLAND)
-typedef ui::WaylandEvent* NativeEvent;
-#else
-typedef GdkEvent* NativeEvent;
-#endif
-
-#endif
-
-#if defined(USE_X11)
-typedef XEvent* NativeEvent2;
-#else
-typedef void* NativeEvent2;
-#endif
-
-}  // namespace views
-
-#endif  // VIEWS_NATIVE_TYPES_H_
-