gecko-dev/layout/generic/nsFrameState.h

106 строки
2.9 KiB
C
Исходник Обычный вид История

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
/* constants for frame state bits and a type to store them in a uint64_t */
#ifndef nsFrameState_h_
#define nsFrameState_h_
#include <stdint.h>
#ifdef DEBUG
#include "nsString.h"
class nsIFrame;
#endif
typedef uint64_t nsFrameState_size_t;
#define NS_FRAME_STATE_BIT(n_) (nsFrameState(nsFrameState_size_t(1) << (n_)))
#if (_MSC_VER == 1600)
/*
* Visual Studio 2010 has trouble with the sized enum. Although sized enums
* are supported, two problems arise:
*
* 1. Implicit conversions from the enum type to the equivalently sized
* integer size are not performed, leading to many compile errors.
* 2. Even with explicit casts added to avoid the errors from (1), odd
* test failures result, which might well be due to a compiler bug.
*
* So with VS2010 we use consts for the state bits and forgo the increased
* type safety of the enum. (Visual Studio 2012 has no problem with
* nsFrameState being a sized enum, however.)
*/
typedef nsFrameState_size_t nsFrameState;
#define FRAME_STATE_BIT(group_, value_, name_) \
const nsFrameState name_ = NS_FRAME_STATE_BIT(value_);
#include "nsFrameStateBits.h"
#undef FRAME_STATE_BIT
#else
enum nsFrameState : nsFrameState_size_t {
#define FRAME_STATE_BIT(group_, value_, name_) \
name_ = NS_FRAME_STATE_BIT(value_),
#include "nsFrameStateBits.h"
#undef FRAME_STATE_BIT
};
inline nsFrameState operator|(nsFrameState aLeft, nsFrameState aRight)
{
return nsFrameState(nsFrameState_size_t(aLeft) | nsFrameState_size_t(aRight));
}
inline nsFrameState operator&(nsFrameState aLeft, nsFrameState aRight)
{
return nsFrameState(nsFrameState_size_t(aLeft) & nsFrameState_size_t(aRight));
}
inline nsFrameState& operator|=(nsFrameState& aLeft, nsFrameState aRight)
{
aLeft = aLeft | aRight;
return aLeft;
}
inline nsFrameState& operator&=(nsFrameState& aLeft, nsFrameState aRight)
{
aLeft = aLeft & aRight;
return aLeft;
}
inline nsFrameState operator~(nsFrameState aRight)
{
return nsFrameState(~nsFrameState_size_t(aRight));
}
inline nsFrameState operator^(nsFrameState aLeft, nsFrameState aRight)
{
return nsFrameState(nsFrameState_size_t(aLeft) ^ nsFrameState_size_t(aRight));
}
inline nsFrameState& operator^=(nsFrameState& aLeft, nsFrameState aRight)
{
aLeft = aLeft ^ aRight;
return aLeft;
}
#endif
// Bits 20-31 and 60-63 of the frame state are reserved for implementations.
#define NS_FRAME_IMPL_RESERVED nsFrameState(0xF0000000FFF00000)
#define NS_FRAME_RESERVED ~NS_FRAME_IMPL_RESERVED
namespace mozilla {
#ifdef DEBUG
nsCString GetFrameState(nsIFrame* aFrame);
void PrintFrameState(nsIFrame* aFrame);
#endif
} // namespace mozilla
#endif /* nsFrameState_h_ */