gecko-dev/layout/base/nsAutoLayoutPhase.h

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2012-05-21 11:12:37 +00:00
/* 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 nsAutoLayoutPhase_h
#define nsAutoLayoutPhase_h
#ifdef DEBUG
#include "nsPresContext.h"
#include "nsContentUtils.h"
struct nsAutoLayoutPhase {
nsAutoLayoutPhase(nsPresContext* aPresContext, nsLayoutPhase aPhase)
: mPresContext(aPresContext), mPhase(aPhase), mCount(0)
{
Enter();
}
~nsAutoLayoutPhase()
{
Exit();
NS_ASSERTION(mCount == 0, "imbalanced");
}
void Enter()
{
switch (mPhase) {
case eLayoutPhase_Paint:
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
"recurring into paint");
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
"painting in the middle of reflow");
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
"painting in the middle of frame construction");
break;
case eLayoutPhase_Reflow:
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
"reflowing in the middle of a paint");
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
"recurring into reflow");
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
"reflowing in the middle of frame construction");
break;
case eLayoutPhase_FrameC:
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
"constructing frames in the middle of a paint");
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
"constructing frames in the middle of reflow");
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
"recurring into frame construction");
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"constructing frames and scripts are not blocked");
break;
default:
break;
}
++(mPresContext->mLayoutPhaseCount[mPhase]);
++mCount;
}
void Exit()
{
NS_ASSERTION(mCount > 0 && mPresContext->mLayoutPhaseCount[mPhase] > 0,
"imbalanced");
--(mPresContext->mLayoutPhaseCount[mPhase]);
--mCount;
}
private:
nsPresContext* mPresContext;
nsLayoutPhase mPhase;
uint32_t mCount;
};
#define AUTO_LAYOUT_PHASE_ENTRY_POINT(pc_, phase_) \
nsAutoLayoutPhase autoLayoutPhase((pc_), (eLayoutPhase_##phase_))
#define LAYOUT_PHASE_TEMP_EXIT() \
PR_BEGIN_MACRO \
autoLayoutPhase.Exit(); \
PR_END_MACRO
#define LAYOUT_PHASE_TEMP_REENTER() \
PR_BEGIN_MACRO \
autoLayoutPhase.Enter(); \
PR_END_MACRO
#else
#define AUTO_LAYOUT_PHASE_ENTRY_POINT(pc_, phase_) \
PR_BEGIN_MACRO PR_END_MACRO
#define LAYOUT_PHASE_TEMP_EXIT() \
PR_BEGIN_MACRO PR_END_MACRO
#define LAYOUT_PHASE_TEMP_REENTER() \
PR_BEGIN_MACRO PR_END_MACRO
#endif
#endif // nsAutoLayoutPhase_h