зеркало из https://github.com/mozilla/gecko-dev.git
2658 строки
94 KiB
C++
2658 строки
94 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Steve Clark <buster@netscape.com>
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* Pierre Phaneuf <pp@ludusdesign.com>
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* L. David Baron <dbaron@dbaron.org>
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* Robert O'Callahan <roc+moz@cs.cmu.edu>
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* IBM Corporation
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* Mats Palmgren <mats.palmgren@bredband.net>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* state and methods used while laying out a single line of a block frame */
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#define PL_ARENA_CONST_ALIGN_MASK (sizeof(void*)-1)
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#include "plarena.h"
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#include "nsCOMPtr.h"
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#include "nsLineLayout.h"
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#include "nsBlockFrame.h"
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#include "nsInlineFrame.h"
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#include "nsStyleConsts.h"
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#include "nsHTMLContainerFrame.h"
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#include "nsFloatManager.h"
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#include "nsStyleContext.h"
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#include "nsPresContext.h"
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#include "nsIFontMetrics.h"
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#include "nsIThebesFontMetrics.h"
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#include "nsIRenderingContext.h"
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#include "nsGkAtoms.h"
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#include "nsPlaceholderFrame.h"
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#include "nsIDocument.h"
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#include "nsIHTMLDocument.h"
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#include "nsIContent.h"
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#include "nsTextFragment.h"
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#include "nsBidiUtils.h"
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#include "nsLayoutUtils.h"
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#include "nsTextFrame.h"
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#include "nsCSSRendering.h"
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#ifdef DEBUG
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#undef NOISY_HORIZONTAL_ALIGN
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#undef NOISY_VERTICAL_ALIGN
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#undef REALLY_NOISY_VERTICAL_ALIGN
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#undef NOISY_REFLOW
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#undef REALLY_NOISY_REFLOW
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#undef NOISY_PUSHING
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#undef REALLY_NOISY_PUSHING
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#undef DEBUG_ADD_TEXT
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#undef NOISY_MAX_ELEMENT_SIZE
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#undef REALLY_NOISY_MAX_ELEMENT_SIZE
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#undef NOISY_CAN_PLACE_FRAME
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#undef NOISY_TRIM
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#undef REALLY_NOISY_TRIM
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#endif
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//----------------------------------------------------------------------
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#define FIX_BUG_50257
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#define PLACED_LEFT 0x1
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#define PLACED_RIGHT 0x2
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nsLineLayout::nsLineLayout(nsPresContext* aPresContext,
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nsFloatManager* aFloatManager,
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const nsHTMLReflowState* aOuterReflowState,
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const nsLineList::iterator* aLine)
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: mPresContext(aPresContext),
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mFloatManager(aFloatManager),
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mBlockReflowState(aOuterReflowState),
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mLastOptionalBreakContent(nsnull),
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mForceBreakContent(nsnull),
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mLastOptionalBreakContentOffset(-1),
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mForceBreakContentOffset(-1),
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mLastOptionalBreakPriority(eNoBreak),
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mBlockRS(nsnull),/* XXX temporary */
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mMinLineHeight(0),
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mTextIndent(0)
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{
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NS_ASSERTION(aFloatManager || aOuterReflowState->frame->GetType() ==
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nsGkAtoms::letterFrame,
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"float manager should be present");
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MOZ_COUNT_CTOR(nsLineLayout);
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// Stash away some style data that we need
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mStyleText = aOuterReflowState->frame->GetStyleText();
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mTextAlign = mStyleText->mTextAlign;
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mLineNumber = 0;
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mFlags = 0; // default all flags to false except those that follow here...
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mPlacedFloats = 0;
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mTotalPlacedFrames = 0;
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mTopEdge = 0;
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mTrimmableWidth = 0;
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// Instead of always pre-initializing the free-lists for frames and
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// spans, we do it on demand so that situations that only use a few
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// frames and spans won't waste a lot of time in unneeded
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// initialization.
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PL_INIT_ARENA_POOL(&mArena, "nsLineLayout", 1024);
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mFrameFreeList = nsnull;
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mSpanFreeList = nsnull;
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mCurrentSpan = mRootSpan = nsnull;
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mSpanDepth = 0;
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if (aLine) {
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SetFlag(LL_GOTLINEBOX, PR_TRUE);
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mLineBox = *aLine;
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}
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}
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nsLineLayout::~nsLineLayout()
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{
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MOZ_COUNT_DTOR(nsLineLayout);
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NS_ASSERTION(nsnull == mRootSpan, "bad line-layout user");
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// PL_FreeArenaPool takes our memory and puts in on a global free list so
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// that the next time an arena makes an allocation it will not have to go
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// all the way down to malloc. This is desirable as this class is created
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// and destroyed in a tight loop.
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//
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// I looked at the code. It is not technically necessary to call
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// PL_FinishArenaPool() after PL_FreeArenaPool(), but from an API
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// standpoint, I think we are susposed to. It will be very fast anyway,
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// since PL_FreeArenaPool() has done all the work.
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PL_FreeArenaPool(&mArena);
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PL_FinishArenaPool(&mArena);
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}
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// Find out if the frame has a non-null prev-in-flow, i.e., whether it
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// is a continuation.
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inline PRBool
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HasPrevInFlow(nsIFrame *aFrame)
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{
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nsIFrame *prevInFlow = aFrame->GetPrevInFlow();
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return prevInFlow != nsnull;
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}
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void
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nsLineLayout::BeginLineReflow(nscoord aX, nscoord aY,
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nscoord aWidth, nscoord aHeight,
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PRBool aImpactedByFloats,
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PRBool aIsTopOfPage)
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{
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NS_ASSERTION(nsnull == mRootSpan, "bad linelayout user");
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NS_ASSERTION(aWidth != NS_UNCONSTRAINEDSIZE,
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"should no longer be using unconstrained widths");
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#ifdef DEBUG
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if ((aWidth != NS_UNCONSTRAINEDSIZE) && CRAZY_WIDTH(aWidth)) {
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NS_NOTREACHED("bad width");
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nsFrame::ListTag(stdout, mBlockReflowState->frame);
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printf(": Init: bad caller: width WAS %d(0x%x)\n",
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aWidth, aWidth);
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}
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if ((aHeight != NS_UNCONSTRAINEDSIZE) && CRAZY_HEIGHT(aHeight)) {
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NS_NOTREACHED("bad height");
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nsFrame::ListTag(stdout, mBlockReflowState->frame);
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printf(": Init: bad caller: height WAS %d(0x%x)\n",
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aHeight, aHeight);
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}
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#endif
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#ifdef NOISY_REFLOW
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nsFrame::ListTag(stdout, mBlockReflowState->frame);
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printf(": BeginLineReflow: %d,%d,%d,%d impacted=%s %s\n",
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aX, aY, aWidth, aHeight,
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aImpactedByFloats?"true":"false",
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aIsTopOfPage ? "top-of-page" : "");
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#endif
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#ifdef DEBUG
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mSpansAllocated = mSpansFreed = mFramesAllocated = mFramesFreed = 0;
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#endif
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SetFlag(LL_FIRSTLETTERSTYLEOK, PR_FALSE);
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SetFlag(LL_ISTOPOFPAGE, aIsTopOfPage);
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mPlacedFloats = 0;
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SetFlag(LL_IMPACTEDBYFLOATS, aImpactedByFloats);
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mTotalPlacedFrames = 0;
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SetFlag(LL_LINEISEMPTY, PR_TRUE);
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SetFlag(LL_LINEENDSINBR, PR_FALSE);
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mSpanDepth = 0;
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mMaxTopBoxHeight = mMaxBottomBoxHeight = 0;
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PerSpanData* psd;
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NewPerSpanData(&psd);
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mCurrentSpan = mRootSpan = psd;
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psd->mReflowState = mBlockReflowState;
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psd->mLeftEdge = aX;
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psd->mX = aX;
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psd->mRightEdge = aX + aWidth;
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mTopEdge = aY;
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psd->mNoWrap = !mStyleText->WhiteSpaceCanWrap();
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psd->mDirection = mBlockReflowState->mStyleVisibility->mDirection;
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psd->mChangedFrameDirection = PR_FALSE;
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// If this is the first line of a block then see if the text-indent
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// property amounts to anything.
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if (0 == mLineNumber && !HasPrevInFlow(mBlockReflowState->frame)) {
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nscoord indent = 0;
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nsStyleUnit unit = mStyleText->mTextIndent.GetUnit();
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if (eStyleUnit_Coord == unit) {
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indent = mStyleText->mTextIndent.GetCoordValue();
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}
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else if (eStyleUnit_Percent == unit) {
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nscoord width =
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nsHTMLReflowState::GetContainingBlockContentWidth(mBlockReflowState);
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if ((0 != width) && (NS_UNCONSTRAINEDSIZE != width)) {
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indent = nscoord(mStyleText->mTextIndent.GetPercentValue() * width);
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}
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if (GetFlag(LL_GOTLINEBOX)) {
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mLineBox->DisableResizeReflowOptimization();
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}
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}
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mTextIndent = indent;
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if (NS_STYLE_DIRECTION_RTL == psd->mDirection) {
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psd->mRightEdge -= indent;
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}
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else {
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psd->mX += indent;
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}
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}
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}
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void
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nsLineLayout::EndLineReflow()
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{
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#ifdef NOISY_REFLOW
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nsFrame::ListTag(stdout, mBlockReflowState->frame);
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printf(": EndLineReflow: width=%d\n", mRootSpan->mX - mRootSpan->mLeftEdge);
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#endif
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FreeSpan(mRootSpan);
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mCurrentSpan = mRootSpan = nsnull;
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NS_ASSERTION(mSpansAllocated == mSpansFreed, "leak");
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NS_ASSERTION(mFramesAllocated == mFramesFreed, "leak");
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#if 0
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static PRInt32 maxSpansAllocated = NS_LINELAYOUT_NUM_SPANS;
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static PRInt32 maxFramesAllocated = NS_LINELAYOUT_NUM_FRAMES;
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if (mSpansAllocated > maxSpansAllocated) {
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printf("XXX: saw a line with %d spans\n", mSpansAllocated);
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maxSpansAllocated = mSpansAllocated;
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}
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if (mFramesAllocated > maxFramesAllocated) {
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printf("XXX: saw a line with %d frames\n", mFramesAllocated);
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maxFramesAllocated = mFramesAllocated;
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}
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#endif
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}
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// XXX swtich to a single mAvailLineWidth that we adjust as each frame
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// on the line is placed. Each span can still have a per-span mX that
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// tracks where a child frame is going in its span; they don't need a
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// per-span mLeftEdge?
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void
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nsLineLayout::UpdateBand(const nsRect& aNewAvailSpace,
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PRBool aPlacedLeftFloat,
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nsIFrame* aFloatFrame)
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{
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#ifdef REALLY_NOISY_REFLOW
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printf("nsLL::UpdateBand %d, %d, %d, %d, frame=%p placedLeft=%s\n will set mImpacted to PR_TRUE\n",
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aNewAvailSpace.x, aNewAvailSpace.y,
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aNewAvailSpace.width, aNewAvailSpace.height,
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aFloatFrame, aPlacedLeftFloat?"true":"false");
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#endif
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#ifdef DEBUG
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if ((aNewAvailSpace.width != NS_UNCONSTRAINEDSIZE) && CRAZY_WIDTH(aNewAvailSpace.width)) {
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nsFrame::ListTag(stdout, mBlockReflowState->frame);
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printf(": UpdateBand: bad caller: width WAS %d(0x%x)\n",
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aNewAvailSpace.width, aNewAvailSpace.width);
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}
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if ((aNewAvailSpace.height != NS_UNCONSTRAINEDSIZE) && CRAZY_HEIGHT(aNewAvailSpace.height)) {
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nsFrame::ListTag(stdout, mBlockReflowState->frame);
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printf(": UpdateBand: bad caller: height WAS %d(0x%x)\n",
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aNewAvailSpace.height, aNewAvailSpace.height);
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}
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#endif
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// Compute the difference between last times width and the new width
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NS_ASSERTION(mRootSpan->mRightEdge != NS_UNCONSTRAINEDSIZE &&
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aNewAvailSpace.width != NS_UNCONSTRAINEDSIZE,
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"shouldn't use unconstrained widths anymore");
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// The root span's mLeftEdge moves to aX
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nscoord deltaX = aNewAvailSpace.x - mRootSpan->mLeftEdge;
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// The width of all spans changes by this much (the root span's
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// mRightEdge moves to aX + aWidth, its new width is aWidth)
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nscoord deltaWidth = aNewAvailSpace.width - (mRootSpan->mRightEdge - mRootSpan->mLeftEdge);
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#ifdef NOISY_REFLOW
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nsFrame::ListTag(stdout, mBlockReflowState->frame);
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printf(": UpdateBand: %d,%d,%d,%d deltaWidth=%d deltaX=%d %s float\n",
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aNewAvailSpace.x, aNewAvailSpace.y,
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aNewAvailSpace.width, aNewAvailSpace.height, deltaWidth, deltaX,
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aPlacedLeftFloat ? "left" : "right");
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#endif
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// Update the root span position
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mRootSpan->mLeftEdge += deltaX;
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mRootSpan->mRightEdge += deltaX;
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mRootSpan->mX += deltaX;
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// Now update the right edges of the open spans to account for any
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// change in available space width
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for (PerSpanData* psd = mCurrentSpan; psd; psd = psd->mParent) {
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psd->mRightEdge += deltaWidth;
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psd->mContainsFloat = PR_TRUE;
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NS_ASSERTION(psd->mX - mTrimmableWidth <= psd->mRightEdge,
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"We placed a float where there was no room!");
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#ifdef NOISY_REFLOW
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printf(" span %p: oldRightEdge=%d newRightEdge=%d\n",
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psd, psd->mRightEdge - deltaRightEdge, psd->mRightEdge);
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#endif
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}
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NS_ASSERTION(mRootSpan->mContainsFloat &&
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mRootSpan->mLeftEdge == aNewAvailSpace.x &&
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mRootSpan->mRightEdge == aNewAvailSpace.XMost(),
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"root span was updated incorrectly?");
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// Update frame bounds
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// Note: Only adjust the outermost frames (the ones that are direct
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// children of the block), not the ones in the child spans. The reason
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// is simple: the frames in the spans have coordinates local to their
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// parent therefore they are moved when their parent span is moved.
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if (deltaX != 0) {
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for (PerFrameData* pfd = mRootSpan->mFirstFrame; pfd; pfd = pfd->mNext) {
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pfd->mBounds.x += deltaX;
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}
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}
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mTopEdge = aNewAvailSpace.y;
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mPlacedFloats |= (aPlacedLeftFloat ? PLACED_LEFT : PLACED_RIGHT);
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SetFlag(LL_IMPACTEDBYFLOATS, PR_TRUE);
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SetFlag(LL_LASTFLOATWASLETTERFRAME,
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nsGkAtoms::letterFrame == aFloatFrame->GetType());
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}
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nsresult
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nsLineLayout::NewPerSpanData(PerSpanData** aResult)
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{
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PerSpanData* psd = mSpanFreeList;
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if (nsnull == psd) {
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void *mem;
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PL_ARENA_ALLOCATE(mem, &mArena, sizeof(PerSpanData));
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if (nsnull == mem) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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psd = reinterpret_cast<PerSpanData*>(mem);
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}
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else {
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mSpanFreeList = psd->mNextFreeSpan;
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}
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psd->mParent = nsnull;
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psd->mFrame = nsnull;
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psd->mFirstFrame = nsnull;
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psd->mLastFrame = nsnull;
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psd->mContainsFloat = PR_FALSE;
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psd->mZeroEffectiveSpanBox = PR_FALSE;
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psd->mHasNonemptyContent = PR_FALSE;
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#ifdef DEBUG
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mSpansAllocated++;
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#endif
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*aResult = psd;
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return NS_OK;
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}
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nsresult
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nsLineLayout::BeginSpan(nsIFrame* aFrame,
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const nsHTMLReflowState* aSpanReflowState,
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nscoord aLeftEdge,
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nscoord aRightEdge)
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{
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NS_ASSERTION(aRightEdge != NS_UNCONSTRAINEDSIZE,
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"should no longer be using unconstrained sizes");
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#ifdef NOISY_REFLOW
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nsFrame::IndentBy(stdout, mSpanDepth+1);
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nsFrame::ListTag(stdout, aFrame);
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printf(": BeginSpan leftEdge=%d rightEdge=%d\n", aLeftEdge, aRightEdge);
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#endif
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PerSpanData* psd;
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nsresult rv = NewPerSpanData(&psd);
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if (NS_SUCCEEDED(rv)) {
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// Link up span frame's pfd to point to its child span data
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PerFrameData* pfd = mCurrentSpan->mLastFrame;
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NS_ASSERTION(pfd->mFrame == aFrame, "huh?");
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pfd->mSpan = psd;
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// Init new span
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psd->mFrame = pfd;
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psd->mParent = mCurrentSpan;
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psd->mReflowState = aSpanReflowState;
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psd->mLeftEdge = aLeftEdge;
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psd->mX = aLeftEdge;
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psd->mRightEdge = aRightEdge;
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psd->mNoWrap =
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!aSpanReflowState->frame->GetStyleText()->WhiteSpaceCanWrap();
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psd->mDirection = aSpanReflowState->mStyleVisibility->mDirection;
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psd->mChangedFrameDirection = PR_FALSE;
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// Switch to new span
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mCurrentSpan = psd;
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mSpanDepth++;
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}
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return rv;
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}
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nscoord
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nsLineLayout::EndSpan(nsIFrame* aFrame)
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{
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NS_ASSERTION(mSpanDepth > 0, "end-span without begin-span");
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#ifdef NOISY_REFLOW
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nsFrame::IndentBy(stdout, mSpanDepth);
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nsFrame::ListTag(stdout, aFrame);
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printf(": EndSpan width=%d\n", mCurrentSpan->mX - mCurrentSpan->mLeftEdge);
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#endif
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PerSpanData* psd = mCurrentSpan;
|
|
nscoord widthResult = psd->mLastFrame ? (psd->mX - psd->mLeftEdge) : 0;
|
|
|
|
mSpanDepth--;
|
|
mCurrentSpan->mReflowState = nsnull; // no longer valid so null it out!
|
|
mCurrentSpan = mCurrentSpan->mParent;
|
|
return widthResult;
|
|
}
|
|
|
|
PRInt32
|
|
nsLineLayout::GetCurrentSpanCount() const
|
|
{
|
|
NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
|
|
PRInt32 count = 0;
|
|
PerFrameData* pfd = mRootSpan->mFirstFrame;
|
|
while (nsnull != pfd) {
|
|
count++;
|
|
pfd = pfd->mNext;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
void
|
|
nsLineLayout::SplitLineTo(PRInt32 aNewCount)
|
|
{
|
|
NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
|
|
|
|
#ifdef REALLY_NOISY_PUSHING
|
|
printf("SplitLineTo %d (current count=%d); before:\n", aNewCount,
|
|
GetCurrentSpanCount());
|
|
DumpPerSpanData(mRootSpan, 1);
|
|
#endif
|
|
PerSpanData* psd = mRootSpan;
|
|
PerFrameData* pfd = psd->mFirstFrame;
|
|
while (nsnull != pfd) {
|
|
if (--aNewCount == 0) {
|
|
// Truncate list at pfd (we keep pfd, but anything following is freed)
|
|
PerFrameData* next = pfd->mNext;
|
|
pfd->mNext = nsnull;
|
|
psd->mLastFrame = pfd;
|
|
|
|
// Now release all of the frames following pfd
|
|
pfd = next;
|
|
while (nsnull != pfd) {
|
|
next = pfd->mNext;
|
|
pfd->mNext = mFrameFreeList;
|
|
mFrameFreeList = pfd;
|
|
#ifdef DEBUG
|
|
mFramesFreed++;
|
|
#endif
|
|
if (nsnull != pfd->mSpan) {
|
|
FreeSpan(pfd->mSpan);
|
|
}
|
|
pfd = next;
|
|
}
|
|
break;
|
|
}
|
|
pfd = pfd->mNext;
|
|
}
|
|
#ifdef NOISY_PUSHING
|
|
printf("SplitLineTo %d (current count=%d); after:\n", aNewCount,
|
|
GetCurrentSpanCount());
|
|
DumpPerSpanData(mRootSpan, 1);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
nsLineLayout::PushFrame(nsIFrame* aFrame)
|
|
{
|
|
PerSpanData* psd = mCurrentSpan;
|
|
NS_ASSERTION(psd->mLastFrame->mFrame == aFrame, "pushing non-last frame");
|
|
|
|
#ifdef REALLY_NOISY_PUSHING
|
|
nsFrame::IndentBy(stdout, mSpanDepth);
|
|
printf("PushFrame %p, before:\n", psd);
|
|
DumpPerSpanData(psd, 1);
|
|
#endif
|
|
|
|
// Take the last frame off of the span's frame list
|
|
PerFrameData* pfd = psd->mLastFrame;
|
|
if (pfd == psd->mFirstFrame) {
|
|
// We are pushing away the only frame...empty the list
|
|
psd->mFirstFrame = nsnull;
|
|
psd->mLastFrame = nsnull;
|
|
}
|
|
else {
|
|
PerFrameData* prevFrame = pfd->mPrev;
|
|
prevFrame->mNext = nsnull;
|
|
psd->mLastFrame = prevFrame;
|
|
}
|
|
|
|
// Now free it, and if it has a span, free that too
|
|
pfd->mNext = mFrameFreeList;
|
|
mFrameFreeList = pfd;
|
|
#ifdef DEBUG
|
|
mFramesFreed++;
|
|
#endif
|
|
if (nsnull != pfd->mSpan) {
|
|
FreeSpan(pfd->mSpan);
|
|
}
|
|
#ifdef NOISY_PUSHING
|
|
nsFrame::IndentBy(stdout, mSpanDepth);
|
|
printf("PushFrame: %p after:\n", psd);
|
|
DumpPerSpanData(psd, 1);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
nsLineLayout::FreeSpan(PerSpanData* psd)
|
|
{
|
|
// Free its frames
|
|
PerFrameData* pfd = psd->mFirstFrame;
|
|
while (nsnull != pfd) {
|
|
if (nsnull != pfd->mSpan) {
|
|
FreeSpan(pfd->mSpan);
|
|
}
|
|
PerFrameData* next = pfd->mNext;
|
|
pfd->mNext = mFrameFreeList;
|
|
mFrameFreeList = pfd;
|
|
#ifdef DEBUG
|
|
mFramesFreed++;
|
|
#endif
|
|
pfd = next;
|
|
}
|
|
|
|
// Now put the span on the free list since it's free too
|
|
psd->mNextFreeSpan = mSpanFreeList;
|
|
mSpanFreeList = psd;
|
|
#ifdef DEBUG
|
|
mSpansFreed++;
|
|
#endif
|
|
}
|
|
|
|
PRBool
|
|
nsLineLayout::IsZeroHeight()
|
|
{
|
|
PerSpanData* psd = mCurrentSpan;
|
|
PerFrameData* pfd = psd->mFirstFrame;
|
|
while (nsnull != pfd) {
|
|
if (0 != pfd->mBounds.height) {
|
|
return PR_FALSE;
|
|
}
|
|
pfd = pfd->mNext;
|
|
}
|
|
return PR_TRUE;
|
|
}
|
|
|
|
nsresult
|
|
nsLineLayout::NewPerFrameData(PerFrameData** aResult)
|
|
{
|
|
PerFrameData* pfd = mFrameFreeList;
|
|
if (nsnull == pfd) {
|
|
void *mem;
|
|
PL_ARENA_ALLOCATE(mem, &mArena, sizeof(PerFrameData));
|
|
if (nsnull == mem) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
pfd = reinterpret_cast<PerFrameData*>(mem);
|
|
}
|
|
else {
|
|
mFrameFreeList = pfd->mNext;
|
|
}
|
|
pfd->mSpan = nsnull;
|
|
pfd->mNext = nsnull;
|
|
pfd->mPrev = nsnull;
|
|
pfd->mFrame = nsnull;
|
|
pfd->mFlags = 0; // all flags default to false
|
|
|
|
#ifdef DEBUG
|
|
pfd->mVerticalAlign = 0xFF;
|
|
mFramesAllocated++;
|
|
#endif
|
|
*aResult = pfd;
|
|
return NS_OK;
|
|
}
|
|
|
|
PRBool
|
|
nsLineLayout::LineIsBreakable() const
|
|
{
|
|
// XXX mTotalPlacedFrames should go away and we should just use
|
|
// LL_LINEISEMPTY here instead
|
|
if ((0 != mTotalPlacedFrames) || GetFlag(LL_IMPACTEDBYFLOATS)) {
|
|
return PR_TRUE;
|
|
}
|
|
return PR_FALSE;
|
|
}
|
|
|
|
// Checks all four sides for percentage units. This means it should
|
|
// only be used for things (margin, padding) where percentages on top
|
|
// and bottom depend on the *width* just like percentages on left and
|
|
// right.
|
|
static PRBool
|
|
HasPercentageUnitSide(const nsStyleSides& aSides)
|
|
{
|
|
NS_FOR_CSS_SIDES(side) {
|
|
if (eStyleUnit_Percent == aSides.GetUnit(side))
|
|
return PR_TRUE;
|
|
}
|
|
return PR_FALSE;
|
|
}
|
|
|
|
inline PRBool
|
|
WidthDependsOnContainer(const nsStyleCoord& aCoord)
|
|
{
|
|
return aCoord.GetUnit() == eStyleUnit_Percent ||
|
|
(aCoord.GetUnit() == eStyleUnit_Enumerated &&
|
|
(aCoord.GetIntValue() == NS_STYLE_WIDTH_AVAILABLE ||
|
|
aCoord.GetIntValue() == NS_STYLE_WIDTH_FIT_CONTENT));
|
|
|
|
}
|
|
|
|
static PRBool
|
|
IsPercentageAware(const nsIFrame* aFrame)
|
|
{
|
|
NS_ASSERTION(aFrame, "null frame is not allowed");
|
|
|
|
nsIAtom *fType = aFrame->GetType();
|
|
if (fType == nsGkAtoms::textFrame) {
|
|
// None of these things can ever be true for text frames.
|
|
return PR_FALSE;
|
|
}
|
|
|
|
// Some of these things don't apply to non-replaced inline frames
|
|
// (that is, fType == nsGkAtoms::inlineFrame || fType ==
|
|
// nsGkAtoms::positionedInlineFrame), but we won't bother making
|
|
// things unnecessarily complicated, since they'll probably be set
|
|
// quite rarely.
|
|
|
|
const nsStyleMargin* margin = aFrame->GetStyleMargin();
|
|
if (HasPercentageUnitSide(margin->mMargin)) {
|
|
return PR_TRUE;
|
|
}
|
|
|
|
const nsStylePadding* padding = aFrame->GetStylePadding();
|
|
if (HasPercentageUnitSide(padding->mPadding)) {
|
|
return PR_TRUE;
|
|
}
|
|
|
|
// Note that borders can't be aware of percentages
|
|
|
|
const nsStylePosition* pos = aFrame->GetStylePosition();
|
|
|
|
if (WidthDependsOnContainer(pos->mWidth) ||
|
|
WidthDependsOnContainer(pos->mMaxWidth) ||
|
|
WidthDependsOnContainer(pos->mMinWidth) ||
|
|
eStyleUnit_Percent == pos->mOffset.GetRightUnit() ||
|
|
eStyleUnit_Percent == pos->mOffset.GetLeftUnit()) {
|
|
return PR_TRUE;
|
|
}
|
|
|
|
if (eStyleUnit_Auto == pos->mWidth.GetUnit()) {
|
|
// We need to check for frames that shrink-wrap when they're auto
|
|
// width.
|
|
const nsStyleDisplay* disp = aFrame->GetStyleDisplay();
|
|
if (disp->mDisplay == NS_STYLE_DISPLAY_INLINE_BLOCK ||
|
|
disp->mDisplay == NS_STYLE_DISPLAY_INLINE_TABLE ||
|
|
fType == nsGkAtoms::HTMLButtonControlFrame ||
|
|
fType == nsGkAtoms::gfxButtonControlFrame ||
|
|
fType == nsGkAtoms::fieldSetFrame ||
|
|
fType == nsGkAtoms::comboboxDisplayFrame) {
|
|
return PR_TRUE;
|
|
}
|
|
|
|
// Handle SVG, which doesn't map width/height into style
|
|
if ((
|
|
#ifdef MOZ_SVG
|
|
fType == nsGkAtoms::svgOuterSVGFrame ||
|
|
#endif
|
|
fType == nsGkAtoms::subDocumentFrame) &&
|
|
const_cast<nsIFrame*>(aFrame)->GetIntrinsicSize().width.GetUnit() ==
|
|
eStyleUnit_Percent) {
|
|
return PR_TRUE;
|
|
}
|
|
}
|
|
|
|
return PR_FALSE;
|
|
}
|
|
|
|
nsresult
|
|
nsLineLayout::ReflowFrame(nsIFrame* aFrame,
|
|
nsReflowStatus& aReflowStatus,
|
|
nsHTMLReflowMetrics* aMetrics,
|
|
PRBool& aPushedFrame)
|
|
{
|
|
// Initialize OUT parameter
|
|
aPushedFrame = PR_FALSE;
|
|
|
|
PerFrameData* pfd;
|
|
nsresult rv = NewPerFrameData(&pfd);
|
|
if (NS_FAILED(rv)) {
|
|
return rv;
|
|
}
|
|
PerSpanData* psd = mCurrentSpan;
|
|
psd->AppendFrame(pfd);
|
|
|
|
#ifdef REALLY_NOISY_REFLOW
|
|
nsFrame::IndentBy(stdout, mSpanDepth);
|
|
printf("%p: Begin ReflowFrame pfd=%p ", psd, pfd);
|
|
nsFrame::ListTag(stdout, aFrame);
|
|
printf("\n");
|
|
#endif
|
|
|
|
// See if this frame depends on the width of its containing block. If
|
|
// so, disable resize reflow optimizations for the line. (Note that,
|
|
// to be conservative, we do this if we *try* to fit a frame on a
|
|
// line, even if we don't succeed.)
|
|
if (GetFlag(LL_GOTLINEBOX) && IsPercentageAware(aFrame)) {
|
|
mLineBox->DisableResizeReflowOptimization();
|
|
}
|
|
|
|
// Compute the available size for the frame. This available width
|
|
// includes room for the side margins.
|
|
// For now, set the available height to unconstrained always.
|
|
nsSize availSize(mBlockReflowState->ComputedWidth(), NS_UNCONSTRAINEDSIZE);
|
|
|
|
// Setup reflow state for reflowing the frame
|
|
nsHTMLReflowState reflowState(mPresContext, *psd->mReflowState,
|
|
aFrame, availSize);
|
|
reflowState.mLineLayout = this;
|
|
reflowState.mFlags.mIsTopOfPage = GetFlag(LL_ISTOPOFPAGE);
|
|
mTextJustificationNumSpaces = 0;
|
|
mTextJustificationNumLetters = 0;
|
|
|
|
// Inline-ish and text-ish things don't compute their width;
|
|
// everything else does. We need to give them an available width that
|
|
// reflects the space left on the line.
|
|
NS_ASSERTION(psd->mRightEdge != NS_UNCONSTRAINEDSIZE,
|
|
"shouldn't have unconstrained widths anymore");
|
|
if (reflowState.ComputedWidth() == NS_UNCONSTRAINEDSIZE)
|
|
reflowState.availableWidth = psd->mRightEdge - psd->mX;
|
|
|
|
// Stash copies of some of the computed state away for later
|
|
// (vertical alignment, for example)
|
|
pfd->mFrame = aFrame;
|
|
pfd->mMargin = reflowState.mComputedMargin;
|
|
pfd->mBorderPadding = reflowState.mComputedBorderPadding;
|
|
pfd->SetFlag(PFD_RELATIVEPOS,
|
|
(reflowState.mStyleDisplay->mPosition == NS_STYLE_POSITION_RELATIVE));
|
|
if (pfd->GetFlag(PFD_RELATIVEPOS)) {
|
|
pfd->mOffsets = reflowState.mComputedOffsets;
|
|
}
|
|
|
|
// NOTE: While the x coordinate remains relative to the parent span,
|
|
// the y coordinate is fixed at the top edge for the line. During
|
|
// VerticalAlignFrames we will repair this so that the y coordinate
|
|
// is properly set and relative to the appropriate span.
|
|
pfd->mBounds.x = psd->mX;
|
|
pfd->mBounds.y = mTopEdge;
|
|
|
|
// We want to guarantee that we always make progress when
|
|
// formatting. Therefore, if the object being placed on the line is
|
|
// too big for the line, but it is the only thing on the line and is not
|
|
// impacted by a float, then we go ahead and place it anyway. (If the line
|
|
// is impacted by one or more floats, then it is safe to break because
|
|
// we can move the line down below float(s).)
|
|
//
|
|
// Capture this state *before* we reflow the frame in case it clears
|
|
// the state out. We need to know how to treat the current frame
|
|
// when breaking.
|
|
PRBool notSafeToBreak = LineIsEmpty() && !GetFlag(LL_IMPACTEDBYFLOATS);
|
|
|
|
// Apply start margins (as appropriate) to the frame computing the
|
|
// new starting x,y coordinates for the frame.
|
|
ApplyStartMargin(pfd, reflowState);
|
|
|
|
// Let frame know that are reflowing it. Note that we don't bother
|
|
// positioning the frame yet, because we're probably going to end up
|
|
// moving it when we do the vertical alignment
|
|
nscoord x = pfd->mBounds.x;
|
|
nscoord y = pfd->mBounds.y;
|
|
|
|
aFrame->WillReflow(mPresContext);
|
|
|
|
// Adjust spacemanager coordinate system for the frame. The
|
|
// spacemanager coordinates are <b>inside</b> the current spans
|
|
// border+padding, but the x/y coordinates are not (recall that
|
|
// frame coordinates are relative to the parents origin and that the
|
|
// parents border/padding is <b>inside</b> the parent
|
|
// frame. Therefore we have to subtract out the parents
|
|
// border+padding before translating.
|
|
nsHTMLReflowMetrics metrics;
|
|
#ifdef DEBUG
|
|
metrics.width = nscoord(0xdeadbeef);
|
|
metrics.height = nscoord(0xdeadbeef);
|
|
#endif
|
|
nscoord tx = x - psd->mReflowState->mComputedBorderPadding.left;
|
|
nscoord ty = y - psd->mReflowState->mComputedBorderPadding.top;
|
|
mFloatManager->Translate(tx, ty);
|
|
|
|
nsIAtom* frameType = aFrame->GetType();
|
|
PRInt32 savedOptionalBreakOffset;
|
|
gfxBreakPriority savedOptionalBreakPriority;
|
|
nsIContent* savedOptionalBreakContent =
|
|
GetLastOptionalBreakPosition(&savedOptionalBreakOffset,
|
|
&savedOptionalBreakPriority);
|
|
|
|
rv = aFrame->Reflow(mPresContext, metrics, reflowState, aReflowStatus);
|
|
if (NS_FAILED(rv)) {
|
|
NS_WARNING( "Reflow of frame failed in nsLineLayout" );
|
|
return rv;
|
|
}
|
|
|
|
pfd->mJustificationNumSpaces = mTextJustificationNumSpaces;
|
|
pfd->mJustificationNumLetters = mTextJustificationNumLetters;
|
|
|
|
// See if the frame is a placeholderFrame and if it is process
|
|
// the float. At the same time, check if the frame has any non-collapsed-away
|
|
// content.
|
|
PRBool placedFloat = PR_FALSE;
|
|
PRBool isEmpty;
|
|
if (!frameType) {
|
|
isEmpty = pfd->mFrame->IsEmpty();
|
|
} else {
|
|
if (nsGkAtoms::placeholderFrame == frameType) {
|
|
isEmpty = PR_TRUE;
|
|
pfd->SetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE, PR_TRUE);
|
|
nsIFrame* outOfFlowFrame = nsLayoutUtils::GetFloatFromPlaceholder(aFrame);
|
|
if (outOfFlowFrame) {
|
|
nsPlaceholderFrame* placeholder = static_cast<nsPlaceholderFrame*>(aFrame);
|
|
// Add mTrimmableWidth to the available width since if the line ends
|
|
// here, the width of the inline content will be reduced by
|
|
// mTrimmableWidth.
|
|
nscoord availableWidth = psd->mRightEdge - (psd->mX - mTrimmableWidth);
|
|
if (psd->mNoWrap) {
|
|
// If we place floats after inline content where there's
|
|
// no break opportunity, we don't know how much additional
|
|
// width is required for the non-breaking content after the float,
|
|
// so we can't know whether the float plus that content will fit
|
|
// on the line. So for now, don't place floats after inline
|
|
// content where there's no break opportunity. This is incorrect
|
|
// but hopefully rare. Fixing it will require significant
|
|
// restructuring of line layout.
|
|
// We might as well allow zero-width floats to be placed, though.
|
|
availableWidth = 0;
|
|
}
|
|
// XXXldb What is this test supposed to be?
|
|
if (!NS_SUBTREE_DIRTY(aFrame)) {
|
|
// incremental reflow of child
|
|
placedFloat = InitFloat(placeholder, availableWidth, aReflowStatus);
|
|
}
|
|
else {
|
|
placedFloat = AddFloat(placeholder, availableWidth, aReflowStatus);
|
|
}
|
|
NS_ASSERTION(!(outOfFlowFrame->GetType() == nsGkAtoms::letterFrame &&
|
|
GetFirstLetterStyleOK()),
|
|
"FirstLetterStyle set on line with floating first letter");
|
|
}
|
|
}
|
|
else if (nsGkAtoms::textFrame == frameType) {
|
|
// Note non-empty text-frames for inline frame compatibility hackery
|
|
pfd->SetFlag(PFD_ISTEXTFRAME, PR_TRUE);
|
|
nsTextFrame* textFrame = static_cast<nsTextFrame*>(pfd->mFrame);
|
|
isEmpty = !textFrame->HasNoncollapsedCharacters();
|
|
if (!isEmpty) {
|
|
pfd->SetFlag(PFD_ISNONEMPTYTEXTFRAME, PR_TRUE);
|
|
nsIContent* content = textFrame->GetContent();
|
|
|
|
const nsTextFragment* frag = content->GetText();
|
|
if (frag) {
|
|
pfd->SetFlag(PFD_ISNONWHITESPACETEXTFRAME,
|
|
!content->TextIsOnlyWhitespace());
|
|
// fix for bug 40882
|
|
#ifdef IBMBIDI
|
|
if (mPresContext->BidiEnabled()) {
|
|
if (frag->Is2b()) {
|
|
//PRBool isVisual;
|
|
//mPresContext->IsVisualMode(isVisual);
|
|
PRUnichar ch = /*(isVisual) ?
|
|
*(frag->Get2b() + frag->GetLength() - 1) :*/ *frag->Get2b();
|
|
if (IS_BIDI_DIACRITIC(ch)) {
|
|
mPresContext->PropertyTable()->SetProperty(aFrame,
|
|
nsGkAtoms::endsInDiacritic, NS_INT32_TO_PTR(ch),
|
|
nsnull, nsnull);
|
|
}
|
|
}
|
|
}
|
|
#endif // IBMBIDI
|
|
}
|
|
}
|
|
}
|
|
else if (nsGkAtoms::brFrame == frameType) {
|
|
pfd->SetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE, PR_TRUE);
|
|
isEmpty = PR_FALSE;
|
|
} else {
|
|
if (nsGkAtoms::letterFrame==frameType) {
|
|
pfd->SetFlag(PFD_ISLETTERFRAME, PR_TRUE);
|
|
}
|
|
if (pfd->mSpan) {
|
|
isEmpty = !pfd->mSpan->mHasNonemptyContent && pfd->mFrame->IsSelfEmpty();
|
|
} else {
|
|
isEmpty = pfd->mFrame->IsEmpty();
|
|
}
|
|
}
|
|
}
|
|
|
|
mFloatManager->Translate(-tx, -ty);
|
|
|
|
NS_ASSERTION(metrics.width>=0, "bad width");
|
|
NS_ASSERTION(metrics.height>=0,"bad height");
|
|
if (metrics.width<0) metrics.width=0;
|
|
if (metrics.height<0) metrics.height=0;
|
|
|
|
#ifdef DEBUG
|
|
// Note: break-before means ignore the reflow metrics since the
|
|
// frame will be reflowed another time.
|
|
if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
|
|
if (CRAZY_WIDTH(metrics.width) || CRAZY_HEIGHT(metrics.height)) {
|
|
printf("nsLineLayout: ");
|
|
nsFrame::ListTag(stdout, aFrame);
|
|
printf(" metrics=%d,%d!\n", metrics.width, metrics.height);
|
|
}
|
|
if ((metrics.width == nscoord(0xdeadbeef)) ||
|
|
(metrics.height == nscoord(0xdeadbeef))) {
|
|
printf("nsLineLayout: ");
|
|
nsFrame::ListTag(stdout, aFrame);
|
|
printf(" didn't set w/h %d,%d!\n", metrics.width, metrics.height);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
// Unlike with non-inline reflow, the overflow area here does *not*
|
|
// include the accumulation of the frame's bounds and its inline
|
|
// descendants' bounds. Nor does it include the outline area; it's
|
|
// just the union of the bounds of any absolute children. That is
|
|
// added in later by nsLineLayout::ReflowInlineFrames.
|
|
pfd->mCombinedArea = metrics.mOverflowArea;
|
|
|
|
pfd->mBounds.width = metrics.width;
|
|
pfd->mBounds.height = metrics.height;
|
|
|
|
// Size the frame, but |RelativePositionFrames| will size the view.
|
|
aFrame->SetSize(nsSize(metrics.width, metrics.height));
|
|
|
|
// Tell the frame that we're done reflowing it
|
|
aFrame->DidReflow(mPresContext, &reflowState, NS_FRAME_REFLOW_FINISHED);
|
|
|
|
if (aMetrics) {
|
|
*aMetrics = metrics;
|
|
}
|
|
|
|
if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
|
|
// If frame is complete and has a next-in-flow, we need to delete
|
|
// them now. Do not do this when a break-before is signaled because
|
|
// the frame is going to get reflowed again (and may end up wanting
|
|
// a next-in-flow where it ends up).
|
|
if (NS_FRAME_IS_COMPLETE(aReflowStatus)) {
|
|
nsIFrame* kidNextInFlow = aFrame->GetNextInFlow();
|
|
if (nsnull != kidNextInFlow) {
|
|
// Remove all of the childs next-in-flows. Make sure that we ask
|
|
// the right parent to do the removal (it's possible that the
|
|
// parent is not this because we are executing pullup code)
|
|
nsHTMLContainerFrame* parent = static_cast<nsHTMLContainerFrame*>
|
|
(kidNextInFlow->GetParent());
|
|
parent->DeleteNextInFlowChild(mPresContext, kidNextInFlow, PR_TRUE);
|
|
}
|
|
}
|
|
|
|
// Check whether this frame breaks up text runs. All frames break up text
|
|
// runs (hence return false here) except for text frames and inline containers.
|
|
PRBool continuingTextRun = aFrame->CanContinueTextRun();
|
|
|
|
// Clear any residual mTrimmableWidth if this isn't a text frame
|
|
if (!continuingTextRun && !pfd->GetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE)) {
|
|
mTrimmableWidth = 0;
|
|
}
|
|
|
|
// See if we can place the frame. If we can't fit it, then we
|
|
// return now.
|
|
PRBool optionalBreakAfterFits;
|
|
if (CanPlaceFrame(pfd, reflowState, notSafeToBreak, continuingTextRun,
|
|
savedOptionalBreakContent != nsnull, metrics,
|
|
aReflowStatus, &optionalBreakAfterFits)) {
|
|
if (!isEmpty) {
|
|
psd->mHasNonemptyContent = PR_TRUE;
|
|
SetFlag(LL_LINEISEMPTY, PR_FALSE);
|
|
}
|
|
|
|
// Place the frame, updating aBounds with the final size and
|
|
// location. Then apply the bottom+right margins (as
|
|
// appropriate) to the frame.
|
|
PlaceFrame(pfd, metrics);
|
|
PerSpanData* span = pfd->mSpan;
|
|
if (span) {
|
|
// The frame we just finished reflowing is an inline
|
|
// container. It needs its child frames vertically aligned,
|
|
// so do most of it now.
|
|
VerticalAlignFrames(span);
|
|
}
|
|
|
|
if (!continuingTextRun) {
|
|
if (!psd->mNoWrap && (!LineIsEmpty() || placedFloat)) {
|
|
// record soft break opportunity after this content that can't be
|
|
// part of a text run. This is not a text frame so we know
|
|
// that offset PR_INT32_MAX means "after the content".
|
|
if (NotifyOptionalBreakPosition(aFrame->GetContent(), PR_INT32_MAX, optionalBreakAfterFits, eNormalBreak)) {
|
|
// If this returns true then we are being told to actually break here.
|
|
aReflowStatus = NS_INLINE_LINE_BREAK_AFTER(aReflowStatus);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
PushFrame(aFrame);
|
|
aPushedFrame = PR_TRUE;
|
|
// Undo any saved break positions that the frame might have told us about,
|
|
// since we didn't end up placing it
|
|
RestoreSavedBreakPosition(savedOptionalBreakContent,
|
|
savedOptionalBreakOffset,
|
|
savedOptionalBreakPriority);
|
|
}
|
|
}
|
|
else {
|
|
PushFrame(aFrame);
|
|
}
|
|
|
|
#ifdef REALLY_NOISY_REFLOW
|
|
nsFrame::IndentBy(stdout, mSpanDepth);
|
|
printf("End ReflowFrame ");
|
|
nsFrame::ListTag(stdout, aFrame);
|
|
printf(" status=%x\n", aReflowStatus);
|
|
#endif
|
|
|
|
return rv;
|
|
}
|
|
|
|
void
|
|
nsLineLayout::ApplyStartMargin(PerFrameData* pfd,
|
|
nsHTMLReflowState& aReflowState)
|
|
{
|
|
NS_ASSERTION(aReflowState.mStyleDisplay->mFloats == NS_STYLE_FLOAT_NONE,
|
|
"How'd we get a floated inline frame? "
|
|
"The frame ctor should've dealt with this.");
|
|
|
|
// XXXwaterson probably not the right way to get this; e.g., embeddings, etc.
|
|
PRBool ltr = (NS_STYLE_DIRECTION_LTR == aReflowState.mStyleVisibility->mDirection);
|
|
|
|
// Only apply start-margin on the first-in flow for inline frames
|
|
if (pfd->mFrame->GetPrevContinuation()) {
|
|
// Zero this out so that when we compute the max-element-width of
|
|
// the frame we will properly avoid adding in the starting margin.
|
|
if (ltr)
|
|
pfd->mMargin.left = 0;
|
|
else
|
|
pfd->mMargin.right = 0;
|
|
}
|
|
else {
|
|
pfd->mBounds.x += ltr ? pfd->mMargin.left : pfd->mMargin.right;
|
|
|
|
NS_ASSERTION(NS_UNCONSTRAINEDSIZE != aReflowState.availableWidth,
|
|
"shouldn't have unconstrained widths anymore");
|
|
if (NS_UNCONSTRAINEDSIZE == aReflowState.ComputedWidth()) {
|
|
// For inline-ish and text-ish things (which don't compute widths
|
|
// in the reflow state), adjust available width to account for the
|
|
// left margin. The right margin will be accounted for when we
|
|
// finish flowing the frame.
|
|
aReflowState.availableWidth -= ltr ? pfd->mMargin.left : pfd->mMargin.right;
|
|
}
|
|
}
|
|
}
|
|
|
|
nscoord
|
|
nsLineLayout::GetCurrentFrameXDistanceFromBlock()
|
|
{
|
|
PerSpanData* psd;
|
|
nscoord x = 0;
|
|
for (psd = mCurrentSpan; psd; psd = psd->mParent) {
|
|
x += psd->mX;
|
|
}
|
|
return x;
|
|
}
|
|
|
|
/**
|
|
* See if the frame can be placed now that we know it's desired size.
|
|
* We can always place the frame if the line is empty. Note that we
|
|
* know that the reflow-status is not a break-before because if it was
|
|
* ReflowFrame above would have returned false, preventing this method
|
|
* from being called. The logic in this method assumes that.
|
|
*
|
|
* Note that there is no check against the Y coordinate because we
|
|
* assume that the caller will take care of that.
|
|
*/
|
|
PRBool
|
|
nsLineLayout::CanPlaceFrame(PerFrameData* pfd,
|
|
const nsHTMLReflowState& aReflowState,
|
|
PRBool aNotSafeToBreak,
|
|
PRBool aFrameCanContinueTextRun,
|
|
PRBool aCanRollBackBeforeFrame,
|
|
nsHTMLReflowMetrics& aMetrics,
|
|
nsReflowStatus& aStatus,
|
|
PRBool* aOptionalBreakAfterFits)
|
|
{
|
|
NS_PRECONDITION(pfd && pfd->mFrame, "bad args, null pointers for frame data");
|
|
|
|
*aOptionalBreakAfterFits = PR_TRUE;
|
|
// Compute right margin to use
|
|
if (0 != pfd->mBounds.width) {
|
|
NS_ASSERTION(aReflowState.mStyleDisplay->mFloats == NS_STYLE_FLOAT_NONE,
|
|
"How'd we get a floated inline frame? "
|
|
"The frame ctor should've dealt with this.");
|
|
|
|
// XXXwaterson this is probably not exactly right; e.g., embeddings, etc.
|
|
PRBool ltr = (NS_STYLE_DIRECTION_LTR == aReflowState.mStyleVisibility->mDirection);
|
|
|
|
if ((NS_FRAME_IS_NOT_COMPLETE(aStatus) || (pfd->mFrame->GetNextContinuation() && !pfd->mFrame->GetNextInFlow()))
|
|
&& !pfd->GetFlag(PFD_ISLETTERFRAME)) {
|
|
// Only apply end margin for the last-in-flow. Zero this out so
|
|
// that when we compute the max-element-width of the frame we
|
|
// will properly avoid adding in the end margin.
|
|
if (ltr)
|
|
pfd->mMargin.right = 0;
|
|
else
|
|
pfd->mMargin.left = 0;
|
|
}
|
|
}
|
|
else {
|
|
// Don't apply margin to empty frames.
|
|
pfd->mMargin.left = pfd->mMargin.right = 0;
|
|
}
|
|
|
|
PerSpanData* psd = mCurrentSpan;
|
|
if (psd->mNoWrap) {
|
|
// When wrapping is off, everything fits.
|
|
return PR_TRUE;
|
|
}
|
|
|
|
PRBool ltr = NS_STYLE_DIRECTION_LTR == aReflowState.mStyleVisibility->mDirection;
|
|
nscoord endMargin = ltr ? pfd->mMargin.right : pfd->mMargin.left;
|
|
|
|
#ifdef NOISY_CAN_PLACE_FRAME
|
|
if (nsnull != psd->mFrame) {
|
|
nsFrame::ListTag(stdout, psd->mFrame->mFrame);
|
|
}
|
|
else {
|
|
nsFrame::ListTag(stdout, mBlockReflowState->frame);
|
|
}
|
|
printf(": aNotSafeToBreak=%s frame=", aNotSafeToBreak ? "true" : "false");
|
|
nsFrame::ListTag(stdout, pfd->mFrame);
|
|
printf(" frameWidth=%d\n", pfd->mBounds.XMost() + endMargin - psd->mX);
|
|
#endif
|
|
|
|
// Set outside to PR_TRUE if the result of the reflow leads to the
|
|
// frame sticking outside of our available area.
|
|
PRBool outside = pfd->mBounds.XMost() - mTrimmableWidth + endMargin > psd->mRightEdge;
|
|
if (!outside) {
|
|
// If it fits, it fits
|
|
#ifdef NOISY_CAN_PLACE_FRAME
|
|
printf(" ==> inside\n");
|
|
#endif
|
|
return PR_TRUE;
|
|
}
|
|
*aOptionalBreakAfterFits = PR_FALSE;
|
|
|
|
// When it doesn't fit, check for a few special conditions where we
|
|
// allow it to fit anyway.
|
|
if (0 == pfd->mMargin.left + pfd->mBounds.width + pfd->mMargin.right) {
|
|
// Empty frames always fit right where they are
|
|
#ifdef NOISY_CAN_PLACE_FRAME
|
|
printf(" ==> empty frame fits\n");
|
|
#endif
|
|
return PR_TRUE;
|
|
}
|
|
|
|
#ifdef FIX_BUG_50257
|
|
// another special case: always place a BR
|
|
if (nsGkAtoms::brFrame == pfd->mFrame->GetType()) {
|
|
#ifdef NOISY_CAN_PLACE_FRAME
|
|
printf(" ==> BR frame fits\n");
|
|
#endif
|
|
return PR_TRUE;
|
|
}
|
|
#endif
|
|
|
|
if (aNotSafeToBreak) {
|
|
// There are no frames on the line that take up width and the line is
|
|
// not impacted by floats, so we must allow the current frame to be
|
|
// placed on the line
|
|
#ifdef NOISY_CAN_PLACE_FRAME
|
|
printf(" ==> not-safe and not-impacted fits: ");
|
|
while (nsnull != psd) {
|
|
printf("<psd=%p x=%d left=%d> ", psd, psd->mX, psd->mLeftEdge);
|
|
psd = psd->mParent;
|
|
}
|
|
printf("\n");
|
|
#endif
|
|
return PR_TRUE;
|
|
}
|
|
|
|
// Special check for span frames
|
|
if (pfd->mSpan && pfd->mSpan->mContainsFloat) {
|
|
// If the span either directly or indirectly contains a float then
|
|
// it fits. Why? It's kind of complicated, but here goes:
|
|
//
|
|
// 1. CanPlaceFrame is used for all frame placements on a line,
|
|
// and in a span. This includes recursively placement of frames
|
|
// inside of spans, and the span itself. Because the logic always
|
|
// checks for room before proceeding (the code above here), the
|
|
// only things on a line will be those things that "fit".
|
|
//
|
|
// 2. Before a float is placed on a line, the line has to be empty
|
|
// (otherwise it's a "below current line" float and will be placed
|
|
// after the line).
|
|
//
|
|
// Therefore, if the span directly or indirectly has a float
|
|
// then it means that at the time of the placement of the float
|
|
// the line was empty. Because of #1, only the frames that fit can
|
|
// be added after that point, therefore we can assume that the
|
|
// current span being placed has fit.
|
|
//
|
|
// So how do we get here and have a span that should already fit
|
|
// and yet doesn't: Simple: span's that have the no-wrap attribute
|
|
// set on them and contain a float and are placed where they
|
|
// don't naturally fit.
|
|
return PR_TRUE;
|
|
}
|
|
|
|
if (aFrameCanContinueTextRun) {
|
|
// Let it fit, but we reserve the right to roll back.
|
|
// Note that we usually won't get here because a text frame will break
|
|
// itself to avoid exceeding the available width.
|
|
// We'll only get here for text frames that couldn't break early enough.
|
|
#ifdef NOISY_CAN_PLACE_FRAME
|
|
printf(" ==> placing overflowing textrun, requesting backup\n");
|
|
#endif
|
|
|
|
// We will want to try backup.
|
|
SetFlag(LL_NEEDBACKUP, PR_TRUE);
|
|
return PR_TRUE;
|
|
}
|
|
|
|
#ifdef NOISY_CAN_PLACE_FRAME
|
|
printf(" ==> didn't fit\n");
|
|
#endif
|
|
aStatus = NS_INLINE_LINE_BREAK_BEFORE();
|
|
return PR_FALSE;
|
|
}
|
|
|
|
/**
|
|
* Place the frame. Update running counters.
|
|
*/
|
|
void
|
|
nsLineLayout::PlaceFrame(PerFrameData* pfd, nsHTMLReflowMetrics& aMetrics)
|
|
{
|
|
// If frame is zero width then do not apply its left and right margins.
|
|
PerSpanData* psd = mCurrentSpan;
|
|
PRBool emptyFrame = PR_FALSE;
|
|
if ((0 == pfd->mBounds.width) && (0 == pfd->mBounds.height)) {
|
|
pfd->mBounds.x = psd->mX;
|
|
pfd->mBounds.y = mTopEdge;
|
|
emptyFrame = PR_TRUE;
|
|
}
|
|
|
|
// Record ascent and update max-ascent and max-descent values
|
|
if (aMetrics.ascent == nsHTMLReflowMetrics::ASK_FOR_BASELINE)
|
|
pfd->mAscent = pfd->mFrame->GetBaseline();
|
|
else
|
|
pfd->mAscent = aMetrics.ascent;
|
|
|
|
PRBool ltr = (NS_STYLE_DIRECTION_LTR == pfd->mFrame->GetStyleVisibility()->mDirection);
|
|
// Advance to next X coordinate
|
|
psd->mX = pfd->mBounds.XMost() + (ltr ? pfd->mMargin.right : pfd->mMargin.left);
|
|
|
|
// Count the number of non-empty frames on the line...
|
|
if (!emptyFrame) {
|
|
mTotalPlacedFrames++;
|
|
}
|
|
}
|
|
|
|
nsresult
|
|
nsLineLayout::AddBulletFrame(nsIFrame* aFrame,
|
|
const nsHTMLReflowMetrics& aMetrics)
|
|
{
|
|
NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
|
|
|
|
PerFrameData* pfd;
|
|
nsresult rv = NewPerFrameData(&pfd);
|
|
if (NS_SUCCEEDED(rv)) {
|
|
mRootSpan->AppendFrame(pfd);
|
|
pfd->mFrame = aFrame;
|
|
pfd->mMargin.SizeTo(0, 0, 0, 0);
|
|
pfd->mBorderPadding.SizeTo(0, 0, 0, 0);
|
|
pfd->mFlags = 0; // all flags default to false
|
|
pfd->SetFlag(PFD_ISBULLET, PR_TRUE);
|
|
if (aMetrics.ascent == nsHTMLReflowMetrics::ASK_FOR_BASELINE)
|
|
pfd->mAscent = aFrame->GetBaseline();
|
|
else
|
|
pfd->mAscent = aMetrics.ascent;
|
|
|
|
// Note: y value will be updated during vertical alignment
|
|
pfd->mBounds = aFrame->GetRect();
|
|
pfd->mCombinedArea = aMetrics.mOverflowArea;
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
void
|
|
nsLineLayout::DumpPerSpanData(PerSpanData* psd, PRInt32 aIndent)
|
|
{
|
|
nsFrame::IndentBy(stdout, aIndent);
|
|
printf("%p: left=%d x=%d right=%d\n", static_cast<void*>(psd),
|
|
psd->mLeftEdge, psd->mX, psd->mRightEdge);
|
|
PerFrameData* pfd = psd->mFirstFrame;
|
|
while (nsnull != pfd) {
|
|
nsFrame::IndentBy(stdout, aIndent+1);
|
|
nsFrame::ListTag(stdout, pfd->mFrame);
|
|
printf(" %d,%d,%d,%d\n", pfd->mBounds.x, pfd->mBounds.y,
|
|
pfd->mBounds.width, pfd->mBounds.height);
|
|
if (pfd->mSpan) {
|
|
DumpPerSpanData(pfd->mSpan, aIndent + 1);
|
|
}
|
|
pfd = pfd->mNext;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#define VALIGN_OTHER 0
|
|
#define VALIGN_TOP 1
|
|
#define VALIGN_BOTTOM 2
|
|
|
|
void
|
|
nsLineLayout::VerticalAlignLine()
|
|
{
|
|
// Synthesize a PerFrameData for the block frame
|
|
PerFrameData rootPFD;
|
|
rootPFD.mFrame = mBlockReflowState->frame;
|
|
rootPFD.mAscent = 0;
|
|
mRootSpan->mFrame = &rootPFD;
|
|
|
|
// Partially place the children of the block frame. The baseline for
|
|
// this operation is set to zero so that the y coordinates for all
|
|
// of the placed children will be relative to there.
|
|
PerSpanData* psd = mRootSpan;
|
|
VerticalAlignFrames(psd);
|
|
|
|
// Compute the line-height. The line-height will be the larger of:
|
|
//
|
|
// [1] maxY - minY (the distance between the highest childs top edge
|
|
// and the lowest childs bottom edge)
|
|
//
|
|
// [2] the maximum logical box height (since not every frame may have
|
|
// participated in #1; for example: top/bottom aligned frames)
|
|
//
|
|
// [3] the minimum line height (line-height property set on the
|
|
// block frame)
|
|
nscoord lineHeight = psd->mMaxY - psd->mMinY;
|
|
|
|
// Now that the line-height is computed, we need to know where the
|
|
// baseline is in the line. Position baseline so that mMinY is just
|
|
// inside the top of the line box.
|
|
nscoord baselineY;
|
|
if (psd->mMinY < 0) {
|
|
baselineY = mTopEdge - psd->mMinY;
|
|
}
|
|
else {
|
|
baselineY = mTopEdge;
|
|
}
|
|
|
|
// It's also possible that the line-height isn't tall enough because
|
|
// of top/bottom aligned elements that were not accounted for in
|
|
// min/max Y.
|
|
//
|
|
// The CSS2 spec doesn't really say what happens when to the
|
|
// baseline in this situations. What we do is if the largest top
|
|
// aligned box height is greater than the line-height then we leave
|
|
// the baseline alone. If the largest bottom aligned box is greater
|
|
// than the line-height then we slide the baseline down by the extra
|
|
// amount.
|
|
//
|
|
// Navigator 4 gives precedence to the first top/bottom aligned
|
|
// object. We just let bottom aligned objects win.
|
|
if (lineHeight < mMaxBottomBoxHeight) {
|
|
// When the line is shorter than the maximum top aligned box
|
|
nscoord extra = mMaxBottomBoxHeight - lineHeight;
|
|
baselineY += extra;
|
|
lineHeight = mMaxBottomBoxHeight;
|
|
}
|
|
if (lineHeight < mMaxTopBoxHeight) {
|
|
lineHeight = mMaxTopBoxHeight;
|
|
}
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" [line]==> lineHeight=%d baselineY=%d\n", lineHeight, baselineY);
|
|
#endif
|
|
|
|
// Now position all of the frames in the root span. We will also
|
|
// recurse over the child spans and place any top/bottom aligned
|
|
// frames we find.
|
|
// XXX PERFORMANCE: set a bit per-span to avoid the extra work
|
|
// (propagate it upward too)
|
|
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
|
|
if (pfd->mVerticalAlign == VALIGN_OTHER) {
|
|
pfd->mBounds.y += baselineY;
|
|
pfd->mFrame->SetRect(pfd->mBounds);
|
|
}
|
|
}
|
|
PlaceTopBottomFrames(psd, -mTopEdge, lineHeight);
|
|
|
|
// Fill in returned line-box and max-element-width data
|
|
mLineBox->mBounds.x = psd->mLeftEdge;
|
|
mLineBox->mBounds.y = mTopEdge;
|
|
mLineBox->mBounds.width = psd->mX - psd->mLeftEdge;
|
|
mLineBox->mBounds.height = lineHeight;
|
|
mFinalLineHeight = lineHeight;
|
|
mLineBox->SetAscent(baselineY - mTopEdge);
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(
|
|
" [line]==> bounds{x,y,w,h}={%d,%d,%d,%d} lh=%d a=%d\n",
|
|
mLineBox->mBounds.x, mLineBox->mBounds.y,
|
|
mLineBox->mBounds.width, mLineBox->mBounds.height,
|
|
mFinalLineHeight, mLineBox->GetAscent());
|
|
#endif
|
|
|
|
// Undo root-span mFrame pointer to prevent brane damage later on...
|
|
mRootSpan->mFrame = nsnull;
|
|
}
|
|
|
|
void
|
|
nsLineLayout::PlaceTopBottomFrames(PerSpanData* psd,
|
|
nscoord aDistanceFromTop,
|
|
nscoord aLineHeight)
|
|
{
|
|
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
|
|
PerSpanData* span = pfd->mSpan;
|
|
#ifdef DEBUG
|
|
NS_ASSERTION(0xFF != pfd->mVerticalAlign, "umr");
|
|
#endif
|
|
switch (pfd->mVerticalAlign) {
|
|
case VALIGN_TOP:
|
|
if (span) {
|
|
pfd->mBounds.y = -aDistanceFromTop - span->mMinY;
|
|
}
|
|
else {
|
|
pfd->mBounds.y = -aDistanceFromTop + pfd->mMargin.top;
|
|
}
|
|
pfd->mFrame->SetRect(pfd->mBounds);
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" ");
|
|
nsFrame::ListTag(stdout, pfd->mFrame);
|
|
printf(": y=%d dTop=%d [bp.top=%d topLeading=%d]\n",
|
|
pfd->mBounds.y, aDistanceFromTop,
|
|
span ? pfd->mBorderPadding.top : 0,
|
|
span ? span->mTopLeading : 0);
|
|
#endif
|
|
break;
|
|
case VALIGN_BOTTOM:
|
|
if (span) {
|
|
// Compute bottom leading
|
|
pfd->mBounds.y = -aDistanceFromTop + aLineHeight - span->mMaxY;
|
|
}
|
|
else {
|
|
pfd->mBounds.y = -aDistanceFromTop + aLineHeight -
|
|
pfd->mMargin.bottom - pfd->mBounds.height;
|
|
}
|
|
pfd->mFrame->SetRect(pfd->mBounds);
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" ");
|
|
nsFrame::ListTag(stdout, pfd->mFrame);
|
|
printf(": y=%d\n", pfd->mBounds.y);
|
|
#endif
|
|
break;
|
|
}
|
|
if (span) {
|
|
nscoord distanceFromTop = aDistanceFromTop + pfd->mBounds.y;
|
|
PlaceTopBottomFrames(span, distanceFromTop, aLineHeight);
|
|
}
|
|
}
|
|
}
|
|
|
|
#define VERTICAL_ALIGN_FRAMES_NO_MINIMUM nscoord_MAX
|
|
#define VERTICAL_ALIGN_FRAMES_NO_MAXIMUM nscoord_MIN
|
|
|
|
// Vertically place frames within a given span. Note: this doesn't
|
|
// place top/bottom aligned frames as those have to wait until the
|
|
// entire line box height is known. This is called after the span
|
|
// frame has finished being reflowed so that we know its height.
|
|
void
|
|
nsLineLayout::VerticalAlignFrames(PerSpanData* psd)
|
|
{
|
|
// Get parent frame info
|
|
PerFrameData* spanFramePFD = psd->mFrame;
|
|
nsIFrame* spanFrame = spanFramePFD->mFrame;
|
|
|
|
// Get the parent frame's font for all of the frames in this span
|
|
nsStyleContext* styleContext = spanFrame->GetStyleContext();
|
|
nsIRenderingContext* rc = mBlockReflowState->rendContext;
|
|
nsLayoutUtils::SetFontFromStyle(mBlockReflowState->rendContext, styleContext);
|
|
nsCOMPtr<nsIFontMetrics> fm;
|
|
rc->GetFontMetrics(*getter_AddRefs(fm));
|
|
|
|
PRBool preMode = mStyleText->WhiteSpaceIsSignificant();
|
|
|
|
// See if the span is an empty continuation. It's an empty continuation iff:
|
|
// - it has a prev-in-flow
|
|
// - it has no next in flow
|
|
// - it's zero sized
|
|
PRBool emptyContinuation = psd != mRootSpan &&
|
|
spanFrame->GetPrevInFlow() && !spanFrame->GetNextInFlow() &&
|
|
(0 == spanFramePFD->mBounds.width) && (0 == spanFramePFD->mBounds.height);
|
|
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf("[%sSpan]", (psd == mRootSpan)?"Root":"");
|
|
nsFrame::ListTag(stdout, spanFrame);
|
|
printf(": preMode=%s strictMode=%s w/h=%d,%d emptyContinuation=%s",
|
|
preMode ? "yes" : "no",
|
|
mPresContext->CompatibilityMode() != eCompatibility_NavQuirks ? "yes" : "no",
|
|
spanFramePFD->mBounds.width, spanFramePFD->mBounds.height,
|
|
emptyContinuation ? "yes" : "no");
|
|
if (psd != mRootSpan) {
|
|
printf(" bp=%d,%d,%d,%d margin=%d,%d,%d,%d",
|
|
spanFramePFD->mBorderPadding.top,
|
|
spanFramePFD->mBorderPadding.right,
|
|
spanFramePFD->mBorderPadding.bottom,
|
|
spanFramePFD->mBorderPadding.left,
|
|
spanFramePFD->mMargin.top,
|
|
spanFramePFD->mMargin.right,
|
|
spanFramePFD->mMargin.bottom,
|
|
spanFramePFD->mMargin.left);
|
|
}
|
|
printf("\n");
|
|
#endif
|
|
|
|
// Compute the span's mZeroEffectiveSpanBox flag. What we are trying
|
|
// to determine is how we should treat the span: should it act
|
|
// "normally" according to css2 or should it effectively
|
|
// "disappear".
|
|
//
|
|
// In general, if the document being processed is in full standards
|
|
// mode then it should act normally (with one exception). The
|
|
// exception case is when a span is continued and yet the span is
|
|
// empty (e.g. compressed whitespace). For this kind of span we treat
|
|
// it as if it were not there so that it doesn't impact the
|
|
// line-height.
|
|
//
|
|
// In almost standards mode or quirks mode, we should sometimes make
|
|
// it disappear. The cases that matter are those where the span
|
|
// contains no real text elements that would provide an ascent and
|
|
// descent and height. However, if css style elements have been
|
|
// applied to the span (border/padding/margin) so that it's clear the
|
|
// document author is intending css2 behavior then we act as if strict
|
|
// mode is set.
|
|
//
|
|
// This code works correctly for preMode, because a blank line
|
|
// in PRE mode is encoded as a text node with a LF in it, since
|
|
// text nodes with only whitespace are considered in preMode.
|
|
//
|
|
// Much of this logic is shared with the various implementations of
|
|
// nsIFrame::IsEmpty since they need to duplicate the way it makes
|
|
// some lines empty. However, nsIFrame::IsEmpty can't be reused here
|
|
// since this code sets zeroEffectiveSpanBox even when there are
|
|
// non-empty children.
|
|
PRBool zeroEffectiveSpanBox = PR_FALSE;
|
|
// XXXldb If we really have empty continuations, then all these other
|
|
// checks don't make sense for them.
|
|
// XXXldb This should probably just use nsIFrame::IsSelfEmpty, assuming that
|
|
// it agrees with this code. (If it doesn't agree, it probably should.)
|
|
if ((emptyContinuation ||
|
|
mPresContext->CompatibilityMode() != eCompatibility_FullStandards) &&
|
|
((psd == mRootSpan) ||
|
|
((0 == spanFramePFD->mBorderPadding.top) &&
|
|
(0 == spanFramePFD->mBorderPadding.right) &&
|
|
(0 == spanFramePFD->mBorderPadding.bottom) &&
|
|
(0 == spanFramePFD->mBorderPadding.left) &&
|
|
(0 == spanFramePFD->mMargin.top) &&
|
|
(0 == spanFramePFD->mMargin.right) &&
|
|
(0 == spanFramePFD->mMargin.bottom) &&
|
|
(0 == spanFramePFD->mMargin.left)))) {
|
|
// This code handles an issue with compatibility with non-css
|
|
// conformant browsers. In particular, there are some cases
|
|
// where the font-size and line-height for a span must be
|
|
// ignored and instead the span must *act* as if it were zero
|
|
// sized. In general, if the span contains any non-compressed
|
|
// text then we don't use this logic.
|
|
// However, this is not propagated outwards, since (in compatibility
|
|
// mode) we don't want big line heights for things like
|
|
// <p><font size="-1">Text</font></p>
|
|
|
|
// We shouldn't include any whitespace that collapses, unless we're
|
|
// preformatted (in which case it shouldn't, but the width=0 test is
|
|
// perhaps incorrect). This includes whitespace at the beginning of
|
|
// a line and whitespace preceded (?) by other whitespace.
|
|
// See bug 134580 and bug 155333.
|
|
zeroEffectiveSpanBox = PR_TRUE;
|
|
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
|
|
if (pfd->GetFlag(PFD_ISTEXTFRAME) &&
|
|
(pfd->GetFlag(PFD_ISNONWHITESPACETEXTFRAME) || preMode ||
|
|
pfd->mBounds.width != 0)) {
|
|
zeroEffectiveSpanBox = PR_FALSE;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
psd->mZeroEffectiveSpanBox = zeroEffectiveSpanBox;
|
|
|
|
// Setup baselineY, minY, and maxY
|
|
nscoord baselineY, minY, maxY;
|
|
if (psd == mRootSpan) {
|
|
// Use a zero baselineY since we don't yet know where the baseline
|
|
// will be (until we know how tall the line is; then we will
|
|
// know). In addition, use extreme values for the minY and maxY
|
|
// values so that only the child frames will impact their values
|
|
// (since these are children of the block, there is no span box to
|
|
// provide initial values).
|
|
baselineY = 0;
|
|
minY = VERTICAL_ALIGN_FRAMES_NO_MINIMUM;
|
|
maxY = VERTICAL_ALIGN_FRAMES_NO_MAXIMUM;
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf("[RootSpan]");
|
|
nsFrame::ListTag(stdout, spanFrame);
|
|
printf(": pass1 valign frames: topEdge=%d minLineHeight=%d zeroEffectiveSpanBox=%s\n",
|
|
mTopEdge, mMinLineHeight,
|
|
zeroEffectiveSpanBox ? "yes" : "no");
|
|
#endif
|
|
}
|
|
else {
|
|
// Compute the logical height for this span. The logical height
|
|
// is based on the line-height value, not the font-size. Also
|
|
// compute the top leading.
|
|
nscoord logicalHeight = nsHTMLReflowState::CalcLineHeight(spanFrame);
|
|
nscoord contentHeight = spanFramePFD->mBounds.height -
|
|
spanFramePFD->mBorderPadding.top - spanFramePFD->mBorderPadding.bottom;
|
|
|
|
// Special-case for a ::first-letter frame, set the line height to
|
|
// the frame height if the user has left line-height == normal
|
|
if (spanFramePFD->GetFlag(PFD_ISLETTERFRAME) &&
|
|
!spanFrame->GetPrevInFlow() &&
|
|
spanFrame->GetStyleText()->mLineHeight.GetUnit() == eStyleUnit_Normal) {
|
|
logicalHeight = spanFramePFD->mBounds.height;
|
|
}
|
|
|
|
nscoord leading = logicalHeight - contentHeight;
|
|
psd->mTopLeading = leading / 2;
|
|
psd->mBottomLeading = leading - psd->mTopLeading;
|
|
psd->mLogicalHeight = logicalHeight;
|
|
|
|
if (zeroEffectiveSpanBox) {
|
|
// When the span-box is to be ignored, zero out the initial
|
|
// values so that the span doesn't impact the final line
|
|
// height. The contents of the span can impact the final line
|
|
// height.
|
|
|
|
// Note that things are readjusted for this span after its children
|
|
// are reflowed
|
|
minY = VERTICAL_ALIGN_FRAMES_NO_MINIMUM;
|
|
maxY = VERTICAL_ALIGN_FRAMES_NO_MAXIMUM;
|
|
}
|
|
else {
|
|
|
|
// The initial values for the min and max Y values are in the spans
|
|
// coordinate space, and cover the logical height of the span. If
|
|
// there are child frames in this span that stick out of this area
|
|
// then the minY and maxY are updated by the amount of logical
|
|
// height that is outside this range.
|
|
minY = spanFramePFD->mBorderPadding.top - psd->mTopLeading;
|
|
maxY = minY + psd->mLogicalHeight;
|
|
}
|
|
|
|
// This is the distance from the top edge of the parents visual
|
|
// box to the baseline. The span already computed this for us,
|
|
// so just use it.
|
|
baselineY = spanFramePFD->mAscent;
|
|
|
|
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf("[%sSpan]", (psd == mRootSpan)?"Root":"");
|
|
nsFrame::ListTag(stdout, spanFrame);
|
|
printf(": baseLine=%d logicalHeight=%d topLeading=%d h=%d bp=%d,%d zeroEffectiveSpanBox=%s\n",
|
|
baselineY, psd->mLogicalHeight, psd->mTopLeading,
|
|
spanFramePFD->mBounds.height,
|
|
spanFramePFD->mBorderPadding.top, spanFramePFD->mBorderPadding.bottom,
|
|
zeroEffectiveSpanBox ? "yes" : "no");
|
|
#endif
|
|
}
|
|
|
|
nscoord maxTopBoxHeight = 0;
|
|
nscoord maxBottomBoxHeight = 0;
|
|
PerFrameData* pfd = psd->mFirstFrame;
|
|
while (nsnull != pfd) {
|
|
nsIFrame* frame = pfd->mFrame;
|
|
|
|
// sanity check (see bug 105168, non-reproducible crashes from null frame)
|
|
NS_ASSERTION(frame, "null frame in PerFrameData - something is very very bad");
|
|
if (!frame) {
|
|
return;
|
|
}
|
|
|
|
// Compute the logical height of the frame
|
|
nscoord logicalHeight;
|
|
nscoord topLeading;
|
|
PerSpanData* frameSpan = pfd->mSpan;
|
|
if (frameSpan) {
|
|
// For span frames the logical-height and top-leading was
|
|
// pre-computed when the span was reflowed.
|
|
logicalHeight = frameSpan->mLogicalHeight;
|
|
topLeading = frameSpan->mTopLeading;
|
|
}
|
|
else {
|
|
// For other elements the logical height is the same as the
|
|
// frames height plus its margins.
|
|
logicalHeight = pfd->mBounds.height + pfd->mMargin.top +
|
|
pfd->mMargin.bottom;
|
|
topLeading = 0;
|
|
}
|
|
|
|
// Get vertical-align property
|
|
const nsStyleTextReset* textStyle = frame->GetStyleTextReset();
|
|
nsStyleUnit verticalAlignUnit = textStyle->mVerticalAlign.GetUnit();
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" [frame]");
|
|
nsFrame::ListTag(stdout, frame);
|
|
printf(": verticalAlignUnit=%d (enum == %d)\n",
|
|
verticalAlignUnit,
|
|
((eStyleUnit_Enumerated == verticalAlignUnit)
|
|
? textStyle->mVerticalAlign.GetIntValue()
|
|
: -1));
|
|
#endif
|
|
|
|
PRUint8 verticalAlignEnum;
|
|
nscoord parentAscent, parentDescent, parentXHeight;
|
|
nscoord parentSuperscript, parentSubscript;
|
|
nscoord coordOffset, percentOffset, elementLineHeight;
|
|
nscoord revisedBaselineY;
|
|
switch (verticalAlignUnit) {
|
|
case eStyleUnit_Enumerated:
|
|
default:
|
|
if (eStyleUnit_Enumerated == verticalAlignUnit) {
|
|
verticalAlignEnum = textStyle->mVerticalAlign.GetIntValue();
|
|
}
|
|
else {
|
|
verticalAlignEnum = NS_STYLE_VERTICAL_ALIGN_BASELINE;
|
|
}
|
|
switch (verticalAlignEnum) {
|
|
default:
|
|
case NS_STYLE_VERTICAL_ALIGN_BASELINE:
|
|
// The elements baseline is aligned with the baseline of
|
|
// the parent.
|
|
pfd->mBounds.y = baselineY - pfd->mAscent;
|
|
pfd->mVerticalAlign = VALIGN_OTHER;
|
|
break;
|
|
|
|
case NS_STYLE_VERTICAL_ALIGN_SUB:
|
|
// Lower the baseline of the box to the subscript offset
|
|
// of the parent's box. This is identical to the baseline
|
|
// alignment except for the addition of the subscript
|
|
// offset to the baseline Y.
|
|
fm->GetSubscriptOffset(parentSubscript);
|
|
revisedBaselineY = baselineY + parentSubscript;
|
|
pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
|
|
pfd->mVerticalAlign = VALIGN_OTHER;
|
|
break;
|
|
|
|
case NS_STYLE_VERTICAL_ALIGN_SUPER:
|
|
// Raise the baseline of the box to the superscript offset
|
|
// of the parent's box. This is identical to the baseline
|
|
// alignment except for the subtraction of the superscript
|
|
// offset to the baseline Y.
|
|
fm->GetSuperscriptOffset(parentSuperscript);
|
|
revisedBaselineY = baselineY - parentSuperscript;
|
|
pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
|
|
pfd->mVerticalAlign = VALIGN_OTHER;
|
|
break;
|
|
|
|
case NS_STYLE_VERTICAL_ALIGN_TOP:
|
|
{
|
|
pfd->mVerticalAlign = VALIGN_TOP;
|
|
nscoord subtreeHeight = logicalHeight;
|
|
if (frameSpan) {
|
|
subtreeHeight = frameSpan->mMaxY - frameSpan->mMinY;
|
|
NS_ASSERTION(subtreeHeight >= logicalHeight,
|
|
"unexpected subtree height");
|
|
}
|
|
if (subtreeHeight > maxTopBoxHeight) {
|
|
maxTopBoxHeight = subtreeHeight;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case NS_STYLE_VERTICAL_ALIGN_BOTTOM:
|
|
{
|
|
pfd->mVerticalAlign = VALIGN_BOTTOM;
|
|
nscoord subtreeHeight = logicalHeight;
|
|
if (frameSpan) {
|
|
subtreeHeight = frameSpan->mMaxY - frameSpan->mMinY;
|
|
NS_ASSERTION(subtreeHeight >= logicalHeight,
|
|
"unexpected subtree height");
|
|
}
|
|
if (subtreeHeight > maxBottomBoxHeight) {
|
|
maxBottomBoxHeight = subtreeHeight;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case NS_STYLE_VERTICAL_ALIGN_MIDDLE:
|
|
// Align the midpoint of the frame with 1/2 the parents
|
|
// x-height above the baseline.
|
|
fm->GetXHeight(parentXHeight);
|
|
if (frameSpan) {
|
|
pfd->mBounds.y = baselineY -
|
|
(parentXHeight + pfd->mBounds.height)/2;
|
|
}
|
|
else {
|
|
pfd->mBounds.y = baselineY - (parentXHeight + logicalHeight)/2 +
|
|
pfd->mMargin.top;
|
|
}
|
|
pfd->mVerticalAlign = VALIGN_OTHER;
|
|
break;
|
|
|
|
case NS_STYLE_VERTICAL_ALIGN_TEXT_TOP:
|
|
// The top of the logical box is aligned with the top of
|
|
// the parent elements text.
|
|
fm->GetMaxAscent(parentAscent);
|
|
if (frameSpan) {
|
|
pfd->mBounds.y = baselineY - parentAscent -
|
|
pfd->mBorderPadding.top + frameSpan->mTopLeading;
|
|
}
|
|
else {
|
|
pfd->mBounds.y = baselineY - parentAscent + pfd->mMargin.top;
|
|
}
|
|
pfd->mVerticalAlign = VALIGN_OTHER;
|
|
break;
|
|
|
|
case NS_STYLE_VERTICAL_ALIGN_TEXT_BOTTOM:
|
|
// The bottom of the logical box is aligned with the
|
|
// bottom of the parent elements text.
|
|
fm->GetMaxDescent(parentDescent);
|
|
if (frameSpan) {
|
|
pfd->mBounds.y = baselineY + parentDescent -
|
|
pfd->mBounds.height + pfd->mBorderPadding.bottom -
|
|
frameSpan->mBottomLeading;
|
|
}
|
|
else {
|
|
pfd->mBounds.y = baselineY + parentDescent -
|
|
pfd->mBounds.height - pfd->mMargin.bottom;
|
|
}
|
|
pfd->mVerticalAlign = VALIGN_OTHER;
|
|
break;
|
|
|
|
case NS_STYLE_VERTICAL_ALIGN_MIDDLE_WITH_BASELINE:
|
|
// Align the midpoint of the frame with the baseline of the parent.
|
|
if (frameSpan) {
|
|
pfd->mBounds.y = baselineY - pfd->mBounds.height/2;
|
|
}
|
|
else {
|
|
pfd->mBounds.y = baselineY - logicalHeight/2 + pfd->mMargin.top;
|
|
}
|
|
pfd->mVerticalAlign = VALIGN_OTHER;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case eStyleUnit_Coord:
|
|
// According to the CSS2 spec (10.8.1), a positive value
|
|
// "raises" the box by the given distance while a negative value
|
|
// "lowers" the box by the given distance (with zero being the
|
|
// baseline). Since Y coordinates increase towards the bottom of
|
|
// the screen we reverse the sign.
|
|
coordOffset = textStyle->mVerticalAlign.GetCoordValue();
|
|
revisedBaselineY = baselineY - coordOffset;
|
|
pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
|
|
pfd->mVerticalAlign = VALIGN_OTHER;
|
|
break;
|
|
|
|
case eStyleUnit_Percent:
|
|
// Similar to a length value (eStyleUnit_Coord) except that the
|
|
// percentage is a function of the elements line-height value.
|
|
elementLineHeight = nsHTMLReflowState::CalcLineHeight(frame);
|
|
percentOffset = nscoord(
|
|
textStyle->mVerticalAlign.GetPercentValue() * elementLineHeight
|
|
);
|
|
revisedBaselineY = baselineY - percentOffset;
|
|
pfd->mBounds.y = revisedBaselineY - pfd->mAscent;
|
|
pfd->mVerticalAlign = VALIGN_OTHER;
|
|
break;
|
|
}
|
|
|
|
// Update minY/maxY for frames that we just placed. Do not factor
|
|
// text into the equation.
|
|
if (pfd->mVerticalAlign == VALIGN_OTHER) {
|
|
// Text frames do not contribute to the min/max Y values for the
|
|
// line (instead their parent frame's font-size contributes).
|
|
// XXXrbs -- relax this restriction because it causes text frames
|
|
// to jam together when 'font-size-adjust' is enabled
|
|
// and layout is using dynamic font heights (bug 20394)
|
|
// -- Note #1: With this code enabled and with the fact that we are not
|
|
// using Em[Ascent|Descent] as nsDimensions for text metrics in
|
|
// GFX mean that the discussion in bug 13072 cannot hold.
|
|
// -- Note #2: We still don't want empty-text frames to interfere.
|
|
// For example in quirks mode, avoiding empty text frames prevents
|
|
// "tall" lines around elements like <hr> since the rules of <hr>
|
|
// in quirks.css have pseudo text contents with LF in them.
|
|
#if 0
|
|
if (!pfd->GetFlag(PFD_ISTEXTFRAME)) {
|
|
#else
|
|
// Only consider non empty text frames when line-height=normal
|
|
PRBool canUpdate = !pfd->GetFlag(PFD_ISTEXTFRAME);
|
|
if (!canUpdate && pfd->GetFlag(PFD_ISNONWHITESPACETEXTFRAME)) {
|
|
canUpdate =
|
|
frame->GetStyleText()->mLineHeight.GetUnit() == eStyleUnit_Normal;
|
|
}
|
|
if (canUpdate) {
|
|
#endif
|
|
nscoord yTop, yBottom;
|
|
if (frameSpan) {
|
|
// For spans that were are now placing, use their position
|
|
// plus their already computed min-Y and max-Y values for
|
|
// computing yTop and yBottom.
|
|
yTop = pfd->mBounds.y + frameSpan->mMinY;
|
|
yBottom = pfd->mBounds.y + frameSpan->mMaxY;
|
|
}
|
|
else {
|
|
yTop = pfd->mBounds.y - pfd->mMargin.top;
|
|
yBottom = yTop + logicalHeight;
|
|
}
|
|
if (!preMode &&
|
|
mPresContext->CompatibilityMode() != eCompatibility_FullStandards &&
|
|
!logicalHeight) {
|
|
// Check if it's a BR frame that is not alone on its line (it
|
|
// is given a height of zero to indicate this), and if so reset
|
|
// yTop and yBottom so that BR frames don't influence the line.
|
|
if (nsGkAtoms::brFrame == frame->GetType()) {
|
|
yTop = VERTICAL_ALIGN_FRAMES_NO_MINIMUM;
|
|
yBottom = VERTICAL_ALIGN_FRAMES_NO_MAXIMUM;
|
|
}
|
|
}
|
|
if (yTop < minY) minY = yTop;
|
|
if (yBottom > maxY) maxY = yBottom;
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" [frame]raw: a=%d h=%d bp=%d,%d logical: h=%d leading=%d y=%d minY=%d maxY=%d\n",
|
|
pfd->mAscent, pfd->mBounds.height,
|
|
pfd->mBorderPadding.top, pfd->mBorderPadding.bottom,
|
|
logicalHeight,
|
|
pfd->mSpan ? topLeading : 0,
|
|
pfd->mBounds.y, minY, maxY);
|
|
#endif
|
|
}
|
|
if (psd != mRootSpan) {
|
|
frame->SetRect(pfd->mBounds);
|
|
}
|
|
}
|
|
pfd = pfd->mNext;
|
|
}
|
|
|
|
// Factor in the minimum line-height when handling the root-span for
|
|
// the block.
|
|
if (psd == mRootSpan) {
|
|
// We should factor in the block element's minimum line-height (as
|
|
// defined in section 10.8.1 of the css2 spec) assuming that
|
|
// mZeroEffectiveSpanBox is not set on the root span. This only happens
|
|
// in some cases in quirks mode:
|
|
// (1) if the root span contains non-whitespace text directly (this
|
|
// is handled by mZeroEffectiveSpanBox
|
|
// (2) if this is the first line of an LI element (whether or not
|
|
// there is a bullet (NN4/IE5 quirk)
|
|
// (3) if this is the last line of an LI, DT, or DD element
|
|
// (The last line before a block also counts, but not before a
|
|
// BR) (NN4/IE5 quirk)
|
|
PRBool applyMinLH = !(psd->mZeroEffectiveSpanBox); // (1) above
|
|
PRBool isFirstLine = !mLineNumber; // if the line number is 0
|
|
PRBool isLastLine = (!mLineBox->IsLineWrapped() && !GetFlag(LL_LINEENDSINBR));
|
|
PRBool foundLI = PR_FALSE; // hack to fix bug 50480.
|
|
//XXX: rather than remembering if we've found an LI, we really should be checking
|
|
// for the existence of a bullet frame. Likewise, the code below should not
|
|
// be checking for any particular content tag type, but rather should
|
|
// be checking for the existence of a bullet frame to determine if it's a list element or not.
|
|
if (!applyMinLH && (isFirstLine || isLastLine)) {
|
|
nsIContent* blockContent = mRootSpan->mFrame->mFrame->GetContent();
|
|
if (blockContent) {
|
|
nsIAtom *blockTagAtom = blockContent->Tag();
|
|
// (2) above, if the first line of LI
|
|
if (isFirstLine && blockTagAtom == nsGkAtoms::li) {
|
|
// if the line is empty, then don't force the min height
|
|
// (see bug 75963)
|
|
if (!IsZeroHeight()) {
|
|
applyMinLH = PR_TRUE;
|
|
foundLI = PR_TRUE;
|
|
}
|
|
}
|
|
// (3) above, if the last line of LI, DT, or DD
|
|
else if (!applyMinLH && isLastLine &&
|
|
((blockTagAtom == nsGkAtoms::li) ||
|
|
(blockTagAtom == nsGkAtoms::dt) ||
|
|
(blockTagAtom == nsGkAtoms::dd))) {
|
|
applyMinLH = PR_TRUE;
|
|
}
|
|
}
|
|
}
|
|
if (applyMinLH) {
|
|
if (psd->mHasNonemptyContent || preMode || foundLI) {
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" [span]==> adjusting min/maxY: currentValues: %d,%d", minY, maxY);
|
|
#endif
|
|
nscoord minimumLineHeight = mMinLineHeight;
|
|
nscoord fontAscent, fontHeight;
|
|
fm->GetMaxAscent(fontAscent);
|
|
fm->GetHeight(fontHeight);
|
|
|
|
nscoord leading = minimumLineHeight - fontHeight;
|
|
nscoord yTop = -fontAscent - leading/2;
|
|
nscoord yBottom = yTop + minimumLineHeight;
|
|
if (yTop < minY) minY = yTop;
|
|
if (yBottom > maxY) maxY = yBottom;
|
|
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" new values: %d,%d\n", minY, maxY);
|
|
#endif
|
|
}
|
|
else {
|
|
// XXX issues:
|
|
// [1] BR's on empty lines stop working
|
|
// [2] May not honor css2's notion of handling empty elements
|
|
// [3] blank lines in a pre-section ("\n") (handled with preMode)
|
|
|
|
// XXX Are there other problems with this?
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" [span]==> zapping min/maxY: currentValues: %d,%d newValues: 0,0\n",
|
|
minY, maxY);
|
|
#endif
|
|
minY = maxY = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ((minY == VERTICAL_ALIGN_FRAMES_NO_MINIMUM) ||
|
|
(maxY == VERTICAL_ALIGN_FRAMES_NO_MAXIMUM)) {
|
|
minY = maxY = baselineY;
|
|
}
|
|
|
|
if ((psd != mRootSpan) && (psd->mZeroEffectiveSpanBox)) {
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" [span]adjusting for zeroEffectiveSpanBox\n");
|
|
printf(" Original: minY=%d, maxY=%d, height=%d, ascent=%d, logicalHeight=%d, topLeading=%d, bottomLeading=%d\n",
|
|
minY, maxY, spanFramePFD->mBounds.height,
|
|
spanFramePFD->mAscent,
|
|
psd->mLogicalHeight, psd->mTopLeading, psd->mBottomLeading);
|
|
#endif
|
|
nscoord goodMinY = spanFramePFD->mBorderPadding.top - psd->mTopLeading;
|
|
nscoord goodMaxY = goodMinY + psd->mLogicalHeight;
|
|
if (minY > goodMinY) {
|
|
nscoord adjust = minY - goodMinY; // positive
|
|
|
|
// shrink the logical extents
|
|
psd->mLogicalHeight -= adjust;
|
|
psd->mTopLeading -= adjust;
|
|
}
|
|
if (maxY < goodMaxY) {
|
|
nscoord adjust = goodMaxY - maxY;
|
|
psd->mLogicalHeight -= adjust;
|
|
psd->mBottomLeading -= adjust;
|
|
}
|
|
if (minY > 0) {
|
|
|
|
// shrink the content by moving its top down. This is tricky, since
|
|
// the top is the 0 for many coordinates, so what we do is
|
|
// move everything else up.
|
|
spanFramePFD->mAscent -= minY; // move the baseline up
|
|
spanFramePFD->mBounds.height -= minY; // move the bottom up
|
|
psd->mTopLeading += minY;
|
|
|
|
pfd = psd->mFirstFrame;
|
|
while (nsnull != pfd) {
|
|
pfd->mBounds.y -= minY; // move all the children back up
|
|
pfd->mFrame->SetRect(pfd->mBounds);
|
|
pfd = pfd->mNext;
|
|
}
|
|
maxY -= minY; // since minY is in the frame's own coordinate system
|
|
minY = 0;
|
|
}
|
|
if (maxY < spanFramePFD->mBounds.height) {
|
|
nscoord adjust = spanFramePFD->mBounds.height - maxY;
|
|
spanFramePFD->mBounds.height -= adjust; // move the bottom up
|
|
psd->mBottomLeading += adjust;
|
|
}
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" New: minY=%d, maxY=%d, height=%d, ascent=%d, logicalHeight=%d, topLeading=%d, bottomLeading=%d\n",
|
|
minY, maxY, spanFramePFD->mBounds.height,
|
|
spanFramePFD->mAscent,
|
|
psd->mLogicalHeight, psd->mTopLeading, psd->mBottomLeading);
|
|
#endif
|
|
}
|
|
|
|
psd->mMinY = minY;
|
|
psd->mMaxY = maxY;
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" [span]==> minY=%d maxY=%d delta=%d maxTopBoxHeight=%d maxBottomBoxHeight=%d\n",
|
|
minY, maxY, maxY - minY, maxTopBoxHeight, maxBottomBoxHeight);
|
|
#endif
|
|
if (maxTopBoxHeight > mMaxTopBoxHeight) {
|
|
mMaxTopBoxHeight = maxTopBoxHeight;
|
|
}
|
|
if (maxBottomBoxHeight > mMaxBottomBoxHeight) {
|
|
mMaxBottomBoxHeight = maxBottomBoxHeight;
|
|
}
|
|
}
|
|
|
|
static void SlideSpanFrameRect(nsIFrame* aFrame, nscoord aDeltaWidth)
|
|
{
|
|
nsRect r = aFrame->GetRect();
|
|
r.x -= aDeltaWidth;
|
|
aFrame->SetRect(r);
|
|
}
|
|
|
|
PRBool
|
|
nsLineLayout::TrimTrailingWhiteSpaceIn(PerSpanData* psd,
|
|
nscoord* aDeltaWidth)
|
|
{
|
|
#ifndef IBMBIDI
|
|
// XXX what about NS_STYLE_DIRECTION_RTL?
|
|
if (NS_STYLE_DIRECTION_RTL == psd->mDirection) {
|
|
*aDeltaWidth = 0;
|
|
return PR_TRUE;
|
|
}
|
|
#endif
|
|
|
|
PerFrameData* pfd = psd->mFirstFrame;
|
|
if (!pfd) {
|
|
*aDeltaWidth = 0;
|
|
return PR_FALSE;
|
|
}
|
|
pfd = pfd->Last();
|
|
while (nsnull != pfd) {
|
|
#ifdef REALLY_NOISY_TRIM
|
|
nsFrame::ListTag(stdout, (psd == mRootSpan
|
|
? mBlockReflowState->frame
|
|
: psd->mFrame->mFrame));
|
|
printf(": attempting trim of ");
|
|
nsFrame::ListTag(stdout, pfd->mFrame);
|
|
printf("\n");
|
|
#endif
|
|
PerSpanData* childSpan = pfd->mSpan;
|
|
if (childSpan) {
|
|
// Maybe the child span has the trailing white-space in it?
|
|
if (TrimTrailingWhiteSpaceIn(childSpan, aDeltaWidth)) {
|
|
nscoord deltaWidth = *aDeltaWidth;
|
|
if (deltaWidth) {
|
|
// Adjust the child spans frame size
|
|
pfd->mBounds.width -= deltaWidth;
|
|
if (psd != mRootSpan) {
|
|
// When the child span is not a direct child of the block
|
|
// we need to update the child spans frame rectangle
|
|
// because it most likely will not be done again. Spans
|
|
// that are direct children of the block will be updated
|
|
// later, however, because the VerticalAlignFrames method
|
|
// will be run after this method.
|
|
nsIFrame* f = pfd->mFrame;
|
|
nsRect r = f->GetRect();
|
|
r.width -= deltaWidth;
|
|
f->SetRect(r);
|
|
}
|
|
|
|
// Adjust the right edge of the span that contains the child span
|
|
psd->mX -= deltaWidth;
|
|
|
|
// Slide any frames that follow the child span over by the
|
|
// right amount. The only thing that can follow the child
|
|
// span is empty stuff, so we are just making things
|
|
// sensible (keeping the combined area honest).
|
|
while (pfd->mNext) {
|
|
pfd = pfd->mNext;
|
|
pfd->mBounds.x -= deltaWidth;
|
|
if (psd != mRootSpan) {
|
|
// When the child span is not a direct child of the block
|
|
// we need to update the child spans frame rectangle
|
|
// because it most likely will not be done again. Spans
|
|
// that are direct children of the block will be updated
|
|
// later, however, because the VerticalAlignFrames method
|
|
// will be run after this method.
|
|
SlideSpanFrameRect(pfd->mFrame, deltaWidth);
|
|
}
|
|
}
|
|
}
|
|
return PR_TRUE;
|
|
}
|
|
}
|
|
else if (!pfd->GetFlag(PFD_ISTEXTFRAME) &&
|
|
!pfd->GetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE)) {
|
|
// If we hit a frame on the end that's not text and not a placeholder,
|
|
// then there is no trailing whitespace to trim. Stop the search.
|
|
*aDeltaWidth = 0;
|
|
return PR_TRUE;
|
|
}
|
|
else if (pfd->GetFlag(PFD_ISTEXTFRAME)) {
|
|
// Call TrimTrailingWhiteSpace even on empty textframes because they
|
|
// might have a soft hyphen which should now appear, changing the frame's
|
|
// width
|
|
nsTextFrame::TrimOutput trimOutput = static_cast<nsTextFrame*>(pfd->mFrame)->
|
|
TrimTrailingWhiteSpace(mBlockReflowState->rendContext);
|
|
#ifdef NOISY_TRIM
|
|
nsFrame::ListTag(stdout, (psd == mRootSpan
|
|
? mBlockReflowState->frame
|
|
: psd->mFrame->mFrame));
|
|
printf(": trim of ");
|
|
nsFrame::ListTag(stdout, pfd->mFrame);
|
|
printf(" returned %d\n", trimOutput.mDeltaWidth);
|
|
#endif
|
|
if (trimOutput.mLastCharIsJustifiable && pfd->mJustificationNumSpaces > 0) {
|
|
pfd->mJustificationNumSpaces--;
|
|
}
|
|
|
|
if (trimOutput.mChanged) {
|
|
pfd->SetFlag(PFD_RECOMPUTEOVERFLOW, PR_TRUE);
|
|
}
|
|
|
|
if (trimOutput.mDeltaWidth) {
|
|
pfd->mBounds.width -= trimOutput.mDeltaWidth;
|
|
|
|
// See if the text frame has already been placed in its parent
|
|
if (psd != mRootSpan) {
|
|
// The frame was already placed during psd's
|
|
// reflow. Update the frames rectangle now.
|
|
pfd->mFrame->SetRect(pfd->mBounds);
|
|
}
|
|
|
|
// Adjust containing span's right edge
|
|
psd->mX -= trimOutput.mDeltaWidth;
|
|
|
|
// Slide any frames that follow the text frame over by the
|
|
// right amount. The only thing that can follow the text
|
|
// frame is empty stuff, so we are just making things
|
|
// sensible (keeping the combined area honest).
|
|
while (pfd->mNext) {
|
|
pfd = pfd->mNext;
|
|
pfd->mBounds.x -= trimOutput.mDeltaWidth;
|
|
if (psd != mRootSpan) {
|
|
// When the child span is not a direct child of the block
|
|
// we need to update the child spans frame rectangle
|
|
// because it most likely will not be done again. Spans
|
|
// that are direct children of the block will be updated
|
|
// later, however, because the VerticalAlignFrames method
|
|
// will be run after this method.
|
|
SlideSpanFrameRect(pfd->mFrame, trimOutput.mDeltaWidth);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (pfd->GetFlag(PFD_ISNONEMPTYTEXTFRAME) || trimOutput.mChanged) {
|
|
// Pass up to caller so they can shrink their span
|
|
*aDeltaWidth = trimOutput.mDeltaWidth;
|
|
return PR_TRUE;
|
|
}
|
|
}
|
|
pfd = pfd->mPrev;
|
|
}
|
|
|
|
*aDeltaWidth = 0;
|
|
return PR_FALSE;
|
|
}
|
|
|
|
PRBool
|
|
nsLineLayout::TrimTrailingWhiteSpace()
|
|
{
|
|
PerSpanData* psd = mRootSpan;
|
|
nscoord deltaWidth;
|
|
TrimTrailingWhiteSpaceIn(psd, &deltaWidth);
|
|
return 0 != deltaWidth;
|
|
}
|
|
|
|
void
|
|
nsLineLayout::ComputeJustificationWeights(PerSpanData* aPSD,
|
|
PRInt32* aNumSpaces,
|
|
PRInt32* aNumLetters)
|
|
{
|
|
NS_ASSERTION(aPSD, "null arg");
|
|
NS_ASSERTION(aNumSpaces, "null arg");
|
|
NS_ASSERTION(aNumLetters, "null arg");
|
|
PRInt32 numSpaces = 0;
|
|
PRInt32 numLetters = 0;
|
|
|
|
for (PerFrameData* pfd = aPSD->mFirstFrame; pfd != nsnull; pfd = pfd->mNext) {
|
|
|
|
if (PR_TRUE == pfd->GetFlag(PFD_ISTEXTFRAME)) {
|
|
numSpaces += pfd->mJustificationNumSpaces;
|
|
numLetters += pfd->mJustificationNumLetters;
|
|
}
|
|
else if (pfd->mSpan != nsnull) {
|
|
PRInt32 spanSpaces;
|
|
PRInt32 spanLetters;
|
|
|
|
ComputeJustificationWeights(pfd->mSpan, &spanSpaces, &spanLetters);
|
|
|
|
numSpaces += spanSpaces;
|
|
numLetters += spanLetters;
|
|
}
|
|
}
|
|
|
|
*aNumSpaces = numSpaces;
|
|
*aNumLetters = numLetters;
|
|
}
|
|
|
|
nscoord
|
|
nsLineLayout::ApplyFrameJustification(PerSpanData* aPSD, FrameJustificationState* aState)
|
|
{
|
|
NS_ASSERTION(aPSD, "null arg");
|
|
NS_ASSERTION(aState, "null arg");
|
|
|
|
nscoord deltaX = 0;
|
|
for (PerFrameData* pfd = aPSD->mFirstFrame; pfd != nsnull; pfd = pfd->mNext) {
|
|
// Don't reposition bullets (and other frames that occur out of X-order?)
|
|
if (!pfd->GetFlag(PFD_ISBULLET)) {
|
|
nscoord dw = 0;
|
|
|
|
pfd->mBounds.x += deltaX;
|
|
|
|
if (PR_TRUE == pfd->GetFlag(PFD_ISTEXTFRAME)) {
|
|
if (aState->mTotalWidthForSpaces > 0 &&
|
|
aState->mTotalNumSpaces > 0) {
|
|
aState->mNumSpacesProcessed += pfd->mJustificationNumSpaces;
|
|
|
|
nscoord newAllocatedWidthForSpaces =
|
|
(aState->mTotalWidthForSpaces*aState->mNumSpacesProcessed)
|
|
/aState->mTotalNumSpaces;
|
|
|
|
dw += newAllocatedWidthForSpaces - aState->mWidthForSpacesProcessed;
|
|
|
|
aState->mWidthForSpacesProcessed = newAllocatedWidthForSpaces;
|
|
}
|
|
|
|
if (aState->mTotalWidthForLetters > 0 &&
|
|
aState->mTotalNumLetters > 0) {
|
|
aState->mNumLettersProcessed += pfd->mJustificationNumLetters;
|
|
|
|
nscoord newAllocatedWidthForLetters =
|
|
(aState->mTotalWidthForLetters*aState->mNumLettersProcessed)
|
|
/aState->mTotalNumLetters;
|
|
|
|
dw += newAllocatedWidthForLetters - aState->mWidthForLettersProcessed;
|
|
|
|
aState->mWidthForLettersProcessed = newAllocatedWidthForLetters;
|
|
}
|
|
|
|
if (dw) {
|
|
pfd->SetFlag(PFD_RECOMPUTEOVERFLOW, PR_TRUE);
|
|
}
|
|
}
|
|
else {
|
|
if (nsnull != pfd->mSpan) {
|
|
dw += ApplyFrameJustification(pfd->mSpan, aState);
|
|
}
|
|
}
|
|
|
|
pfd->mBounds.width += dw;
|
|
|
|
deltaX += dw;
|
|
pfd->mFrame->SetRect(pfd->mBounds);
|
|
}
|
|
}
|
|
return deltaX;
|
|
}
|
|
|
|
void
|
|
nsLineLayout::HorizontalAlignFrames(nsRect& aLineBounds,
|
|
PRBool aAllowJustify)
|
|
{
|
|
PerSpanData* psd = mRootSpan;
|
|
NS_ASSERTION(psd->mRightEdge != NS_UNCONSTRAINEDSIZE,
|
|
"shouldn't have unconstrained widths anymore");
|
|
nscoord availWidth = psd->mRightEdge - psd->mLeftEdge;
|
|
nscoord remainingWidth = availWidth - aLineBounds.width;
|
|
#ifdef NOISY_HORIZONTAL_ALIGN
|
|
nsFrame::ListTag(stdout, mBlockReflowState->frame);
|
|
printf(": availWidth=%d lineWidth=%d delta=%d\n",
|
|
availWidth, aLineBounds.width, remainingWidth);
|
|
#endif
|
|
#ifdef IBMBIDI
|
|
nscoord dx = 0;
|
|
#endif
|
|
|
|
if (remainingWidth > 0)
|
|
{
|
|
#ifndef IBMBIDI
|
|
nscoord dx = 0;
|
|
#endif
|
|
switch (mTextAlign) {
|
|
case NS_STYLE_TEXT_ALIGN_JUSTIFY:
|
|
// If this is not the last line then go ahead and justify the
|
|
// frames in the line.
|
|
if (aAllowJustify) {
|
|
PRInt32 numSpaces;
|
|
PRInt32 numLetters;
|
|
|
|
ComputeJustificationWeights(psd, &numSpaces, &numLetters);
|
|
|
|
if (numSpaces > 0) {
|
|
FrameJustificationState state =
|
|
{ numSpaces, numLetters, remainingWidth, 0, 0, 0, 0, 0 };
|
|
|
|
// Apply the justification, and make sure to update our linebox
|
|
// width to account for it.
|
|
aLineBounds.width += ApplyFrameJustification(psd, &state);
|
|
remainingWidth = availWidth - aLineBounds.width;
|
|
break;
|
|
}
|
|
}
|
|
// Fall through to the default case if we were told not to
|
|
// justify anything or could not justify to fill the space.
|
|
|
|
case NS_STYLE_TEXT_ALIGN_DEFAULT:
|
|
if (NS_STYLE_DIRECTION_LTR == psd->mDirection) {
|
|
// default alignment for left-to-right is left so do nothing
|
|
break;
|
|
}
|
|
// Fall through to align right case for default alignment
|
|
// used when the direction is right-to-left.
|
|
|
|
case NS_STYLE_TEXT_ALIGN_RIGHT:
|
|
case NS_STYLE_TEXT_ALIGN_MOZ_RIGHT:
|
|
dx = remainingWidth;
|
|
break;
|
|
|
|
case NS_STYLE_TEXT_ALIGN_END:
|
|
if (NS_STYLE_DIRECTION_LTR == psd->mDirection) {
|
|
// Do what we do for ALIGN_RIGHT
|
|
dx = remainingWidth;
|
|
break;
|
|
}
|
|
// Fall through to align left case for end alignment
|
|
// used when the direction is right-to-left.
|
|
|
|
case NS_STYLE_TEXT_ALIGN_LEFT:
|
|
case NS_STYLE_TEXT_ALIGN_MOZ_LEFT:
|
|
break;
|
|
|
|
case NS_STYLE_TEXT_ALIGN_CENTER:
|
|
case NS_STYLE_TEXT_ALIGN_MOZ_CENTER:
|
|
dx = remainingWidth / 2;
|
|
break;
|
|
}
|
|
#ifdef IBMBIDI
|
|
}
|
|
else if (remainingWidth < 0) {
|
|
if (NS_STYLE_DIRECTION_RTL == psd->mDirection) {
|
|
dx = remainingWidth;
|
|
psd->mX += dx;
|
|
psd->mLeftEdge += dx;
|
|
}
|
|
}
|
|
PRBool isRTL = ( (NS_STYLE_DIRECTION_RTL == psd->mDirection)
|
|
&& (!psd->mChangedFrameDirection) );
|
|
if (dx || isRTL) {
|
|
nscoord maxX = aLineBounds.XMost() + dx;
|
|
PRBool isVisualRTL = PR_FALSE;
|
|
|
|
if (isRTL) {
|
|
if (psd->mLastFrame->GetFlag(PFD_ISBULLET) ) {
|
|
PerFrameData* bulletPfd = psd->mLastFrame;
|
|
bulletPfd->mBounds.x -= remainingWidth;
|
|
bulletPfd->mFrame->SetRect(bulletPfd->mBounds);
|
|
}
|
|
|
|
psd->mChangedFrameDirection = PR_TRUE;
|
|
|
|
isVisualRTL = mPresContext->IsVisualMode();
|
|
}
|
|
if (dx || isVisualRTL)
|
|
#else
|
|
if (0 != dx)
|
|
#endif
|
|
{
|
|
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
|
|
#ifdef IBMBIDI
|
|
if (isVisualRTL) {
|
|
// XXXldb Ugh. Could we handle this earlier so we don't get here?
|
|
maxX = pfd->mBounds.x = maxX - (pfd->mMargin.left + pfd->mBounds.width + pfd->mMargin.right);
|
|
}
|
|
else
|
|
#endif // IBMBIDI
|
|
pfd->mBounds.x += dx;
|
|
pfd->mFrame->SetRect(pfd->mBounds);
|
|
}
|
|
aLineBounds.x += dx;
|
|
}
|
|
#ifndef IBMBIDI
|
|
if ((NS_STYLE_DIRECTION_RTL == psd->mDirection) &&
|
|
!psd->mChangedFrameDirection) {
|
|
psd->mChangedFrameDirection = PR_TRUE;
|
|
|
|
PerFrameData* pfd = psd->mFirstFrame;
|
|
PRUint32 maxX = psd->mRightEdge;
|
|
while (nsnull != pfd) {
|
|
pfd->mBounds.x = maxX - (pfd->mMargin.left + pfd->mBounds.width + pfd->mMargin.right);
|
|
pfd->mFrame->SetRect(pfd->mBounds);
|
|
maxX = pfd->mBounds.x;
|
|
pfd = pfd->mNext;
|
|
}
|
|
}
|
|
#endif // ndef IBMBIDI
|
|
}
|
|
}
|
|
|
|
void
|
|
nsLineLayout::RelativePositionFrames(nsRect& aCombinedArea)
|
|
{
|
|
RelativePositionFrames(mRootSpan, aCombinedArea);
|
|
}
|
|
|
|
void
|
|
nsLineLayout::RelativePositionFrames(PerSpanData* psd, nsRect& aCombinedArea)
|
|
{
|
|
nsRect combinedAreaResult;
|
|
if (nsnull != psd->mFrame) {
|
|
// The span's overflow area comes in three parts:
|
|
// -- this frame's width and height
|
|
// -- the pfd->mCombinedArea, which is the area of a bullet or the union
|
|
// of a relatively positioned frame's absolute children
|
|
// -- the bounds of all inline descendants
|
|
// The former two parts are computed right here, we gather the descendants
|
|
// below.
|
|
// At this point psd->mFrame->mBounds might be out of date since
|
|
// bidi reordering can move and resize the frames. So use the frame's
|
|
// rect instead of mBounds.
|
|
nsRect adjustedBounds(nsPoint(0, 0), psd->mFrame->mFrame->GetSize());
|
|
|
|
// Text-shadow overflow
|
|
if (mPresContext->CompatibilityMode() != eCompatibility_NavQuirks) {
|
|
nsRect shadowRect = nsLayoutUtils::GetTextShadowRectsUnion(adjustedBounds,
|
|
psd->mFrame->mFrame);
|
|
adjustedBounds.UnionRect(adjustedBounds, shadowRect);
|
|
}
|
|
|
|
combinedAreaResult.UnionRect(psd->mFrame->mCombinedArea, adjustedBounds);
|
|
}
|
|
else {
|
|
// The minimum combined area for the frames that are direct
|
|
// children of the block starts at the upper left corner of the
|
|
// line and is sized to match the size of the line's bounding box
|
|
// (the same size as the values returned from VerticalAlignFrames)
|
|
combinedAreaResult.x = psd->mLeftEdge;
|
|
// If this turns out to be negative, the rect will be treated as empty.
|
|
// Which is just fine.
|
|
combinedAreaResult.width = psd->mX - combinedAreaResult.x;
|
|
combinedAreaResult.y = mTopEdge;
|
|
combinedAreaResult.height = mFinalLineHeight;
|
|
}
|
|
|
|
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
|
|
nsIFrame* frame = pfd->mFrame;
|
|
nsPoint origin = frame->GetPosition();
|
|
|
|
// Adjust the origin of the frame
|
|
if (pfd->GetFlag(PFD_RELATIVEPOS)) {
|
|
// right and bottom are handled by
|
|
// nsHTMLReflowState::ComputeRelativeOffsets
|
|
nsPoint change(pfd->mOffsets.left, pfd->mOffsets.top);
|
|
origin += change;
|
|
frame->SetPosition(origin);
|
|
}
|
|
|
|
// We must position the view correctly before positioning its
|
|
// descendants so that widgets are positioned properly (since only
|
|
// some views have widgets).
|
|
if (frame->HasView())
|
|
nsContainerFrame::SyncFrameViewAfterReflow(mPresContext, frame,
|
|
frame->GetView(),
|
|
&pfd->mCombinedArea, //ignored
|
|
NS_FRAME_NO_SIZE_VIEW);
|
|
|
|
// Note: the combined area of a child is in its coordinate
|
|
// system. We adjust the childs combined area into our coordinate
|
|
// system before computing the aggregated value by adding in
|
|
// <b>x</b> and <b>y</b> which were computed above.
|
|
nsRect r;
|
|
if (pfd->mSpan) {
|
|
// Compute a new combined area for the child span before
|
|
// aggregating it into our combined area.
|
|
RelativePositionFrames(pfd->mSpan, r);
|
|
} else {
|
|
r = pfd->mCombinedArea;
|
|
if (pfd->GetFlag(PFD_ISTEXTFRAME)) {
|
|
if (pfd->GetFlag(PFD_RECOMPUTEOVERFLOW)) {
|
|
nsTextFrame* f = static_cast<nsTextFrame*>(frame);
|
|
r = f->RecomputeOverflowRect();
|
|
}
|
|
frame->FinishAndStoreOverflow(&r, frame->GetSize());
|
|
}
|
|
|
|
// If we have something that's not an inline but with a complex frame
|
|
// hierarchy inside that contains views, they need to be
|
|
// positioned.
|
|
// All descendant views must be repositioned even if this frame
|
|
// does have a view in case this frame's view does not have a
|
|
// widget and some of the descendant views do have widgets --
|
|
// otherwise the widgets won't be repositioned.
|
|
nsContainerFrame::PositionChildViews(frame);
|
|
}
|
|
|
|
// Do this here (rather than along with NS_FRAME_OUTSIDE_CHILDREN
|
|
// handling below) so we get leaf frames as well. No need to worry
|
|
// about the root span, since it doesn't have a frame.
|
|
if (frame->HasView())
|
|
nsContainerFrame::SyncFrameViewAfterReflow(mPresContext, frame,
|
|
frame->GetView(), &r,
|
|
NS_FRAME_NO_MOVE_VIEW);
|
|
|
|
combinedAreaResult.UnionRect(combinedAreaResult, r + origin);
|
|
}
|
|
|
|
// If we just computed a spans combined area, we need to update its
|
|
// NS_FRAME_OUTSIDE_CHILDREN bit..
|
|
if (psd->mFrame) {
|
|
PerFrameData* spanPFD = psd->mFrame;
|
|
nsIFrame* frame = spanPFD->mFrame;
|
|
frame->FinishAndStoreOverflow(&combinedAreaResult, frame->GetSize());
|
|
}
|
|
aCombinedArea = combinedAreaResult;
|
|
}
|