Move services code brought in from Mojo to live under //third_party.

mojo/services/view_manager/public/cpp/view_property.h

-// Copyright 2014 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 MOJO_SERVICES_VIEW_MANAGER_PUBLIC_CPP_VIEW_PROPERTY_H_
-#define MOJO_SERVICES_VIEW_MANAGER_PUBLIC_CPP_VIEW_PROPERTY_H_
-
-#include "base/basictypes.h"
-
-// This header should be included by code that defines ViewProperties. It
-// should not be included by code that only gets and sets ViewProperties.
-//
-// To define a new ViewProperty:
-//
-//  #include "view_manager/public/cpp/view_property.h"
-//
-//  DECLARE_EXPORTED_VIEW_PROPERTY_TYPE(FOO_EXPORT, MyType);
-//  namespace foo {
-//    // Use this to define an exported property that is premitive,
-//    // or a pointer you don't want automatically deleted.
-//    DEFINE_VIEW_PROPERTY_KEY(MyType, kMyKey, MyDefault);
-//
-//    // Use this to define an exported property whose value is a heap
-//    // allocated object, and has to be owned and freed by the view.
-//    DEFINE_OWNED_VIEW_PROPERTY_KEY(gfx::Rect, kRestoreBoundsKey, nullptr);
-//
-//    // Use this to define a non exported property that is primitive,
-//    // or a pointer you don't want to automatically deleted, and is used
-//    // only in a specific file. This will define the property in an unnamed
-//    // namespace which cannot be accessed from another file.
-//    DEFINE_LOCAL_VIEW_PROPERTY_KEY(MyType, kMyKey, MyDefault);
-//
-//  }  // foo namespace
-//
-// To define a new type used for ViewProperty.
-//
-//  // outside all namespaces:
-//  DECLARE_EXPORTED_VIEW_PROPERTY_TYPE(FOO_EXPORT, MyType)
-//
-// If a property type is not exported, use DECLARE_VIEW_PROPERTY_TYPE(MyType)
-// which is a shorthand for DECLARE_EXPORTED_VIEW_PROPERTY_TYPE(, MyType).
-
-namespace mojo {
-namespace {
-
-// No single new-style cast works for every conversion to/from int64, so we
-// need this helper class. A third specialization is needed for bool because
-// MSVC warning C4800 (forcing value to bool) is not suppressed by an explicit
-// cast (!).
-template <typename T>
-class ViewPropertyCaster {
- public:
-  static int64 ToInt64(T x) { return static_cast<int64>(x); }
-  static T FromInt64(int64 x) { return static_cast<T>(x); }
-};
-template <typename T>
-class ViewPropertyCaster<T*> {
- public:
-  static int64 ToInt64(T* x) { return reinterpret_cast<int64>(x); }
-  static T* FromInt64(int64 x) { return reinterpret_cast<T*>(x); }
-};
-template <>
-class ViewPropertyCaster<bool> {
- public:
-  static int64 ToInt64(bool x) { return static_cast<int64>(x); }
-  static bool FromInt64(int64 x) { return x != 0; }
-};
-
-}  // namespace
-
-template <typename T>
-struct ViewProperty {
-  T default_value;
-  const char* name;
-  View::PropertyDeallocator deallocator;
-};
-
-template <typename T>
-void View::SetLocalProperty(const ViewProperty<T>* property, T value) {
-  int64 old = SetLocalPropertyInternal(
-      property, property->name,
-      value == property->default_value ? nullptr : property->deallocator,
-      ViewPropertyCaster<T>::ToInt64(value),
-      ViewPropertyCaster<T>::ToInt64(property->default_value));
-  if (property->deallocator &&
-      old != ViewPropertyCaster<T>::ToInt64(property->default_value)) {
-    (*property->deallocator)(old);
-  }
-}
-
-template <typename T>
-T View::GetLocalProperty(const ViewProperty<T>* property) const {
-  return ViewPropertyCaster<T>::FromInt64(GetLocalPropertyInternal(
-      property, ViewPropertyCaster<T>::ToInt64(property->default_value)));
-}
-
-template <typename T>
-void View::ClearLocalProperty(const ViewProperty<T>* property) {
-  SetLocalProperty(property, property->default_value);
-}
-
-}  // namespace mojo
-
-// Macros to instantiate the property getter/setter template functions.
-#define DECLARE_EXPORTED_VIEW_PROPERTY_TYPE(EXPORT, T)                         \
-  template EXPORT void mojo::View::SetLocalProperty(                           \
-      const mojo::ViewProperty<T>*, T);                                        \
-  template EXPORT T mojo::View::GetLocalProperty(const mojo::ViewProperty<T>*) \
-      const;                                                                   \
-  template EXPORT void mojo::View::ClearLocalProperty(                         \
-      const mojo::ViewProperty<T>*);
-#define DECLARE_VIEW_PROPERTY_TYPE(T) DECLARE_EXPORTED_VIEW_PROPERTY_TYPE(, T)
-
-#define DEFINE_VIEW_PROPERTY_KEY(TYPE, NAME, DEFAULT)                      \
-  COMPILE_ASSERT(sizeof(TYPE) <= sizeof(int64), property_type_too_large);  \
-  namespace {                                                              \
-  const mojo::ViewProperty<TYPE> NAME##_Value = {DEFAULT, #NAME, nullptr}; \
-  }                                                                        \
-  const mojo::ViewProperty<TYPE>* const NAME = &NAME##_Value;
-
-#define DEFINE_LOCAL_VIEW_PROPERTY_KEY(TYPE, NAME, DEFAULT)                \
-  COMPILE_ASSERT(sizeof(TYPE) <= sizeof(int64), property_type_too_large);  \
-  namespace {                                                              \
-  const mojo::ViewProperty<TYPE> NAME##_Value = {DEFAULT, #NAME, nullptr}; \
-  const mojo::ViewProperty<TYPE>* const NAME = &NAME##_Value;              \
-  }
-
-#define DEFINE_OWNED_VIEW_PROPERTY_KEY(TYPE, NAME, DEFAULT)            \
-  namespace {                                                          \
-  void Deallocator##NAME(int64 p) {                                    \
-    enum { type_must_be_complete = sizeof(TYPE) };                     \
-    delete mojo::ViewPropertyCaster<TYPE*>::FromInt64(p);              \
-  }                                                                    \
-  const mojo::ViewProperty<TYPE*> NAME##_Value = {DEFAULT,             \
-                                                  #NAME,               \
-                                                  &Deallocator##NAME}; \
-  }                                                                    \
-  const mojo::ViewProperty<TYPE*>* const NAME = &NAME##_Value;
-
-#endif  // MOJO_SERVICES_VIEW_MANAGER_PUBLIC_CPP_VIEW_PROPERTY_H_