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// Copyright (c) 2012 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_AURA_WINDOW_PROPERTY_H_
#define UI_AURA_WINDOW_PROPERTY_H_
#include "base/basictypes.h"
#include "ui/aura/aura_export.h"
#include "ui/aura/window.h"
// This header should be included by code that defines WindowProperties.
//
// To define a new WindowProperty:
//
// #include "foo/foo_export.h"
// #include "ui/aura/window_property.h"
//
// DECLARE_EXPORTED_WINDOW_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_WINDOW_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 window.
// DEFINE_OWNED_WINDOW_PROPERTY_KEY(gfx::Rect, kRestoreBoundsKey, NULL);
//
// // 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_WINDOW_PROPERTY_KEY(MyType, kMyKey, MyDefault);
//
// } // foo namespace
//
// To define a new type used for WindowProperty.
//
// // outside all namespaces:
// DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(FOO_EXPORT, MyType)
//
// If a property type is not exported, use DECLARE_WINDOW_PROPERTY_TYPE(MyType)
// which is a shorthand for DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(, MyType).
namespace aura {
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 WindowPropertyCaster {
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 WindowPropertyCaster<T*> {
public:
static int64 ToInt64(T* x) { return reinterpret_cast<int64>(x); }
static T* FromInt64(int64 x) { return reinterpret_cast<T*>(x); }
};
template<>
class WindowPropertyCaster<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 WindowProperty {
T default_value;
const char* name;
Window::PropertyDeallocator deallocator;
};
namespace subtle {
class AURA_EXPORT PropertyHelper {
public:
template<typename T>
static void Set(Window* window, const WindowProperty<T>* property, T value) {
int64 old = window->SetPropertyInternal(
property,
property->name,
value == property->default_value ? nullptr : property->deallocator,
WindowPropertyCaster<T>::ToInt64(value),
WindowPropertyCaster<T>::ToInt64(property->default_value));
if (property->deallocator &&
old != WindowPropertyCaster<T>::ToInt64(property->default_value)) {
(*property->deallocator)(old);
}
}
template<typename T>
static T Get(const Window* window, const WindowProperty<T>* property) {
return WindowPropertyCaster<T>::FromInt64(window->GetPropertyInternal(
property, WindowPropertyCaster<T>::ToInt64(property->default_value)));
}
template<typename T>
static void Clear(Window* window, const WindowProperty<T>* property) {
window->SetProperty(property, property->default_value); \
}
};
} // namespace subtle
} // namespace aura
// Macros to instantiate the property getter/setter template functions.
#define DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(EXPORT, T) \
namespace aura { \
template<> EXPORT void aura::Window::SetProperty( \
const WindowProperty<T >* property, T value) { \
subtle::PropertyHelper::Set<T>(this, property, value); \
} \
template<> EXPORT T Window::GetProperty( \
const WindowProperty<T >* property) const { \
return subtle::PropertyHelper::Get<T>(this, property); \
} \
template<> EXPORT void Window::ClearProperty( \
const WindowProperty<T >* property) { \
subtle::PropertyHelper::Clear<T>(this, property); \
} \
}
#define DECLARE_WINDOW_PROPERTY_TYPE(T) \
DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(, T)
#define DEFINE_WINDOW_PROPERTY_KEY(TYPE, NAME, DEFAULT) \
static_assert(sizeof(TYPE) <= sizeof(int64), "property type too large"); \
namespace { \
const aura::WindowProperty<TYPE> NAME ## _Value = \
{DEFAULT, #NAME, nullptr}; \
} \
const aura::WindowProperty<TYPE>* const NAME = & NAME ## _Value;
#define DEFINE_LOCAL_WINDOW_PROPERTY_KEY(TYPE, NAME, DEFAULT) \
static_assert(sizeof(TYPE) <= sizeof(int64), "property type too large"); \
namespace { \
const aura::WindowProperty<TYPE> NAME ## _Value = \
{DEFAULT, #NAME, nullptr}; \
const aura::WindowProperty<TYPE>* const NAME = & NAME ## _Value; \
}
#define DEFINE_OWNED_WINDOW_PROPERTY_KEY(TYPE, NAME, DEFAULT) \
namespace { \
void Deallocator ## NAME (int64 p) { \
enum { type_must_be_complete = sizeof(TYPE) }; \
delete aura::WindowPropertyCaster<TYPE*>::FromInt64(p); \
} \
const aura::WindowProperty<TYPE*> NAME ## _Value = \
{DEFAULT,#NAME,&Deallocator ## NAME}; \
} \
const aura::WindowProperty<TYPE*>* const NAME = & NAME ## _Value;
#endif // UI_AURA_WINDOW_PROPERTY_H_
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