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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsLayoutStatics_h__
#define nsLayoutStatics_h__
#include "nscore.h"
#include "MainThreadUtils.h"
#include "nsISupportsImpl.h"
#include "nsDebug.h"
// This isn't really a class, it's a namespace for static methods.
// Documents and other objects can hold a reference to the layout static
// objects so that they last past the xpcom-shutdown notification.
class nsLayoutStatics
{
public:
// Called by the layout module constructor. This call performs an AddRef()
// internally.
static nsresult Initialize();
static void AddRef()
{
NS_ASSERTION(NS_IsMainThread(),
"nsLayoutStatics reference counting must be on main thread");
NS_ASSERTION(sLayoutStaticRefcnt,
"nsLayoutStatics already dropped to zero!");
++sLayoutStaticRefcnt;
NS_LOG_ADDREF(&sLayoutStaticRefcnt, sLayoutStaticRefcnt,
"nsLayoutStatics", 1);
}
static void Release()
{
NS_ASSERTION(NS_IsMainThread(),
"nsLayoutStatics reference counting must be on main thread");
--sLayoutStaticRefcnt;
NS_LOG_RELEASE(&sLayoutStaticRefcnt, sLayoutStaticRefcnt,
"nsLayoutStatics");
if (!sLayoutStaticRefcnt)
Shutdown();
}
private:
// not to be called!
nsLayoutStatics();
static void Shutdown();
static nsrefcnt sLayoutStaticRefcnt;
};
class nsLayoutStaticsRef
{
public:
nsLayoutStaticsRef()
{
nsLayoutStatics::AddRef();
}
~nsLayoutStaticsRef()
{
nsLayoutStatics::Release();
}
};
#endif // nsLayoutStatics_h__
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