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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_
#pragma once
#include "ui/aura/aura_export.h"
#include "ui/aura/window.h"
// This header should be included by code that defines WindowProperties. It
// should not be included by code that only gets and sets 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 anonymous
// // 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 intptr_t, 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 intptr_t ToIntptrT(T x) { return static_cast<intptr_t>(x); }
static T FromIntptrT(intptr_t x) { return static_cast<T>(x); }
};
template<typename T>
class WindowPropertyCaster<T*> {
public:
static intptr_t ToIntptrT(T* x) { return reinterpret_cast<intptr_t>(x); }
static T* FromIntptrT(intptr_t x) { return reinterpret_cast<T*>(x); }
};
template<>
class WindowPropertyCaster<bool> {
public:
static intptr_t ToIntptrT(bool x) { return static_cast<intptr_t>(x); }
static bool FromIntptrT(intptr_t x) { return x != 0; }
};
} // namespace
template<typename T>
struct WindowProperty {
T default_value;
const char* name;
Window::PropertyDeallocator deallocator;
};
template<typename T>
void Window::SetProperty(const WindowProperty<T>* property, T value) {
intptr_t old = SetPropertyInternal(
property,
property->name,
value == property->default_value ? NULL : property->deallocator,
WindowPropertyCaster<T>::ToIntptrT(value),
WindowPropertyCaster<T>::ToIntptrT(property->default_value));
if (property->deallocator &&
old != WindowPropertyCaster<T>::ToIntptrT(property->default_value)) {
(*property->deallocator)(old);
}
}
template<typename T>
T Window::GetProperty(const WindowProperty<T>* property) const {
return WindowPropertyCaster<T>::FromIntptrT(GetPropertyInternal(
property, WindowPropertyCaster<T>::ToIntptrT(property->default_value)));
}
template<typename T>
void Window::ClearProperty(const WindowProperty<T>* property) {
SetProperty(property, property->default_value);
}
} // namespace aura
// Macros to instantiate the property getter/setter template functions.
#define DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(EXPORT, T) \
template EXPORT void aura::Window::SetProperty( \
const aura::WindowProperty<T >*, T); \
template EXPORT T aura::Window::GetProperty( \
const aura::WindowProperty<T >*) const; \
template EXPORT void aura::Window::ClearProperty( \
const aura::WindowProperty<T >*);
#define DECLARE_WINDOW_PROPERTY_TYPE(T) \
DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(, T)
#define DEFINE_WINDOW_PROPERTY_KEY(TYPE, NAME, DEFAULT) \
namespace { \
const aura::WindowProperty<TYPE> NAME ## _Value = {DEFAULT, #NAME, NULL}; \
} \
const aura::WindowProperty<TYPE>* const NAME = & NAME ## _Value;
#define DEFINE_LOCAL_WINDOW_PROPERTY_KEY(TYPE, NAME, DEFAULT) \
namespace { \
const aura::WindowProperty<TYPE> NAME ## _Value = {DEFAULT, #NAME, NULL}; \
const aura::WindowProperty<TYPE>* const NAME = & NAME ## _Value; \
}
#define DEFINE_OWNED_WINDOW_PROPERTY_KEY(TYPE, NAME, DEFAULT) \
namespace { \
enum { type_must_be_complete = sizeof(TYPE) }; \
void Deallocator(intptr_t p) { \
delete WindowPropertyCaster<TYPE*>::FromIntptrT(p); \
} \
const aura::WindowProperty<TYPE*> NAME ## _Value = \
{DEFAULT,#NAME,&Deallocator}; \
} \
const aura::WindowProperty<TYPE*>* const NAME = & NAME ## _Value;
#endif // UI_AURA_WINDOW_PROPERTY_H_
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