pjs/layout/base/nsAutoLayoutPhase.h

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* the Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
* Timothy Nikkel <tnikkel@gmail.com>
* Boris Zbarsky <bzbarsky@mit.edu>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#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;
PRUint32 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