mirror of
https://github.com/mozilla/gecko-dev.git
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1088 lines
41 KiB
C++
1088 lines
41 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:ts=2:et:sw=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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* Robert O'Callahan <roc+moz@cs.cmu.edu>
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* L. David Baron <dbaron@dbaron.org>
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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 used in reflow of block frames */
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#include "nsBlockReflowContext.h"
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#include "nsBlockReflowState.h"
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#include "nsBlockFrame.h"
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#include "nsLineLayout.h"
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#include "nsPresContext.h"
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#include "nsGkAtoms.h"
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#include "nsIFrame.h"
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#include "nsFrameManager.h"
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#include "nsINameSpaceManager.h"
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#ifdef DEBUG
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#include "nsBlockDebugFlags.h"
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#endif
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nsBlockReflowState::nsBlockReflowState(const nsHTMLReflowState& aReflowState,
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nsPresContext* aPresContext,
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nsBlockFrame* aFrame,
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const nsHTMLReflowMetrics& aMetrics,
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PRBool aTopMarginRoot,
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PRBool aBottomMarginRoot,
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PRBool aBlockNeedsFloatManager)
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: mBlock(aFrame),
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mPresContext(aPresContext),
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mReflowState(aReflowState),
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mOverflowTracker(nsnull),
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mPrevBottomMargin(),
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mLineNumber(0),
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mFlags(0),
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mFloatBreakType(NS_STYLE_CLEAR_NONE)
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{
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SetFlag(BRS_ISFIRSTINFLOW, aFrame->GetPrevInFlow() == nsnull);
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SetFlag(BRS_ISOVERFLOWCONTAINER,
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IS_TRUE_OVERFLOW_CONTAINER(aFrame));
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const nsMargin& borderPadding = BorderPadding();
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if (aTopMarginRoot || 0 != aReflowState.mComputedBorderPadding.top) {
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SetFlag(BRS_ISTOPMARGINROOT, PR_TRUE);
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}
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if (aBottomMarginRoot || 0 != aReflowState.mComputedBorderPadding.bottom) {
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SetFlag(BRS_ISBOTTOMMARGINROOT, PR_TRUE);
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}
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if (GetFlag(BRS_ISTOPMARGINROOT)) {
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SetFlag(BRS_APPLYTOPMARGIN, PR_TRUE);
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}
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if (aBlockNeedsFloatManager) {
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SetFlag(BRS_FLOAT_MGR, PR_TRUE);
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}
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mFloatManager = aReflowState.mFloatManager;
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NS_ASSERTION(mFloatManager,
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"FloatManager should be set in nsBlockReflowState" );
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if (mFloatManager) {
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// Translate into our content area and then save the
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// coordinate system origin for later.
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mFloatManager->Translate(borderPadding.left, borderPadding.top);
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mFloatManager->GetTranslation(mFloatManagerX, mFloatManagerY);
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mFloatManager->PushState(&mFloatManagerStateBefore); // never popped
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}
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mReflowStatus = NS_FRAME_COMPLETE;
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mPresContext = aPresContext;
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mNextInFlow = static_cast<nsBlockFrame*>(mBlock->GetNextInFlow());
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NS_WARN_IF_FALSE(NS_UNCONSTRAINEDSIZE != aReflowState.ComputedWidth(),
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"have unconstrained width; this should only result from "
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"very large sizes, not attempts at intrinsic width "
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"calculation");
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mContentArea.width = aReflowState.ComputedWidth();
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// Compute content area height. Unlike the width, if we have a
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// specified style height we ignore it since extra content is
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// managed by the "overflow" property. When we don't have a
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// specified style height then we may end up limiting our height if
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// the availableHeight is constrained (this situation occurs when we
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// are paginated).
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if (NS_UNCONSTRAINEDSIZE != aReflowState.availableHeight) {
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// We are in a paginated situation. The bottom edge is just inside
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// the bottom border and padding. The content area height doesn't
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// include either border or padding edge.
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mBottomEdge = aReflowState.availableHeight - borderPadding.bottom;
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mContentArea.height = NS_MAX(0, mBottomEdge - borderPadding.top);
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}
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else {
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// When we are not in a paginated situation then we always use
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// an constrained height.
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SetFlag(BRS_UNCONSTRAINEDHEIGHT, PR_TRUE);
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mContentArea.height = mBottomEdge = NS_UNCONSTRAINEDSIZE;
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}
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mY = borderPadding.top;
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mPrevChild = nsnull;
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mCurrentLine = aFrame->end_lines();
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mMinLineHeight = aReflowState.CalcLineHeight();
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}
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nsBlockReflowState::~nsBlockReflowState()
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{
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NS_ASSERTION(mFloatContinuations.IsEmpty(),
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"Leaking float continuation frames");
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// Restore the coordinate system, unless the float manager is null,
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// which means it was just destroyed.
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if (mFloatManager) {
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const nsMargin& borderPadding = BorderPadding();
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mFloatManager->Translate(-borderPadding.left, -borderPadding.top);
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}
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if (GetFlag(BRS_PROPTABLE_FLOATCLIST)) {
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mPresContext->PropertyTable()->
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Delete(mBlock, nsBlockFrame::FloatContinuationProperty());
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}
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}
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nsLineBox*
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nsBlockReflowState::NewLineBox(nsIFrame* aFrame,
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PRInt32 aCount,
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PRBool aIsBlock)
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{
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return NS_NewLineBox(mPresContext->PresShell(), aFrame, aCount, aIsBlock);
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}
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void
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nsBlockReflowState::FreeLineBox(nsLineBox* aLine)
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{
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if (aLine) {
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aLine->Destroy(mPresContext->PresShell());
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}
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}
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void
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nsBlockReflowState::ComputeReplacedBlockOffsetsForFloats(nsIFrame* aFrame,
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const nsRect& aFloatAvailableSpace,
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nscoord& aLeftResult,
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nscoord& aRightResult,
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nsBlockFrame::
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ReplacedElementWidthToClear
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*aReplacedWidth)
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{
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// The frame is clueless about the float manager and therefore we
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// only give it free space. An example is a table frame - the
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// tables do not flow around floats.
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// However, we can let its margins intersect floats.
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NS_ASSERTION(aFloatAvailableSpace.x >= 0, "bad avail space rect x");
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NS_ASSERTION(aFloatAvailableSpace.width == 0 ||
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aFloatAvailableSpace.XMost() <= mContentArea.width,
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"bad avail space rect width");
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nscoord leftOffset, rightOffset;
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if (aFloatAvailableSpace.width == mContentArea.width) {
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// We don't need to compute margins when there are no floats around.
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leftOffset = 0;
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rightOffset = 0;
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} else {
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// We pass in aReplacedWidth to make handling outer table frames
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// work correctly. For outer table frames, we need to subtract off
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// the margin that's going to be at the edge of them, since we're
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// dealing with margin that it's really the child's responsibility
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// to place.
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nsCSSOffsetState os(aFrame, mReflowState.rendContext, mContentArea.width);
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NS_ASSERTION(!aReplacedWidth ||
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aFrame->GetType() == nsGkAtoms::tableOuterFrame ||
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(aReplacedWidth->marginLeft == os.mComputedMargin.left &&
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aReplacedWidth->marginRight == os.mComputedMargin.right),
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"unexpected aReplacedWidth");
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nscoord leftFloatXOffset = aFloatAvailableSpace.x;
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leftOffset = NS_MAX(leftFloatXOffset, os.mComputedMargin.left) -
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(aReplacedWidth ? aReplacedWidth->marginLeft
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: os.mComputedMargin.left);
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leftOffset = NS_MAX(leftOffset, 0); // in case of negative margin
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nscoord rightFloatXOffset =
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mContentArea.width - aFloatAvailableSpace.XMost();
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rightOffset = NS_MAX(rightFloatXOffset, os.mComputedMargin.right) -
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(aReplacedWidth ? aReplacedWidth->marginRight
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: os.mComputedMargin.right);
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rightOffset = NS_MAX(rightOffset, 0); // in case of negative margin
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}
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aLeftResult = leftOffset;
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aRightResult = rightOffset;
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}
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// Compute the amount of available space for reflowing a block frame
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// at the current Y coordinate. This method assumes that
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// GetAvailableSpace has already been called.
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void
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nsBlockReflowState::ComputeBlockAvailSpace(nsIFrame* aFrame,
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const nsStyleDisplay* aDisplay,
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const nsFlowAreaRect& aFloatAvailableSpace,
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PRBool aBlockAvoidsFloats,
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nsRect& aResult)
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{
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#ifdef REALLY_NOISY_REFLOW
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printf("CBAS frame=%p has floats %d\n",
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aFrame, aFloatAvailableSpace.mHasFloats);
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#endif
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aResult.y = mY;
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aResult.height = GetFlag(BRS_UNCONSTRAINEDHEIGHT)
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? NS_UNCONSTRAINEDSIZE
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: NS_MAX(0, mReflowState.availableHeight - mY);
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// mY might be greater than mBottomEdge if the block's top margin pushes
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// it off the page/column. Negative available height can confuse other code
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// and is nonsense in principle.
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const nsMargin& borderPadding = BorderPadding();
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// XXX Do we really want this condition to be this restrictive (i.e.,
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// more restrictive than it used to be)? The |else| here is allowed
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// by the CSS spec, but only out of desperation given implementations,
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// and the behavior it leads to is quite undesirable (it can cause
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// things to become extremely narrow when they'd fit quite well a
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// little bit lower). Should the else be a quirk or something that
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// applies to a specific set of frame classes and no new ones?
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// If we did that, then for those frames where the condition below is
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// true but nsBlockFrame::BlockCanIntersectFloats is false,
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// nsBlockFrame::WidthToClearPastFloats would need to use the
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// shrink-wrap formula, max(MIN_WIDTH, min(avail width, PREF_WIDTH))
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// rather than just using MIN_WIDTH.
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NS_ASSERTION(nsBlockFrame::BlockCanIntersectFloats(aFrame) ==
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!aBlockAvoidsFloats,
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"unexpected replaced width");
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if (!aBlockAvoidsFloats) {
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if (aFloatAvailableSpace.mHasFloats) {
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// Use the float-edge property to determine how the child block
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// will interact with the float.
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const nsStyleBorder* borderStyle = aFrame->GetStyleBorder();
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switch (borderStyle->mFloatEdge) {
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default:
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case NS_STYLE_FLOAT_EDGE_CONTENT: // content and only content does runaround of floats
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// The child block will flow around the float. Therefore
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// give it all of the available space.
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aResult.x = borderPadding.left;
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aResult.width = mContentArea.width;
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break;
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case NS_STYLE_FLOAT_EDGE_MARGIN:
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{
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// The child block's margins should be placed adjacent to,
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// but not overlap the float.
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aResult.x = aFloatAvailableSpace.mRect.x + borderPadding.left;
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aResult.width = aFloatAvailableSpace.mRect.width;
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}
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break;
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}
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}
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else {
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// Since there are no floats present the float-edge property
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// doesn't matter therefore give the block element all of the
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// available space since it will flow around the float itself.
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aResult.x = borderPadding.left;
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aResult.width = mContentArea.width;
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}
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}
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else {
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nsBlockFrame::ReplacedElementWidthToClear replacedWidthStruct;
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nsBlockFrame::ReplacedElementWidthToClear *replacedWidth = nsnull;
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if (aFrame->GetType() == nsGkAtoms::tableOuterFrame) {
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replacedWidth = &replacedWidthStruct;
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replacedWidthStruct =
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nsBlockFrame::WidthToClearPastFloats(*this, aFloatAvailableSpace.mRect,
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aFrame);
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}
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nscoord leftOffset, rightOffset;
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ComputeReplacedBlockOffsetsForFloats(aFrame, aFloatAvailableSpace.mRect,
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leftOffset, rightOffset,
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replacedWidth);
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aResult.x = borderPadding.left + leftOffset;
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aResult.width = mContentArea.width - leftOffset - rightOffset;
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}
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#ifdef REALLY_NOISY_REFLOW
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printf(" CBAS: result %d %d %d %d\n", aResult.x, aResult.y, aResult.width, aResult.height);
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#endif
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}
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nsFlowAreaRect
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nsBlockReflowState::GetFloatAvailableSpaceWithState(
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nscoord aY, PRBool aRelaxHeightConstraint,
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nsFloatManager::SavedState *aState) const
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{
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#ifdef DEBUG
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// Verify that the caller setup the coordinate system properly
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nscoord wx, wy;
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mFloatManager->GetTranslation(wx, wy);
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NS_ASSERTION((wx == mFloatManagerX) && (wy == mFloatManagerY),
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"bad coord system");
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#endif
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nsFlowAreaRect result =
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mFloatManager->GetFlowArea(aY - BorderPadding().top,
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nsFloatManager::BAND_FROM_POINT,
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aRelaxHeightConstraint ? nscoord_MAX
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: mContentArea.height,
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mContentArea.width, aState);
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// Keep the width >= 0 for compatibility with nsSpaceManager.
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if (result.mRect.width < 0)
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result.mRect.width = 0;
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#ifdef DEBUG
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if (nsBlockFrame::gNoisyReflow) {
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nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
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printf("GetAvailableSpace: band=%d,%d,%d,%d hasfloats=%d\n",
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result.mRect.x, result.mRect.y, result.mRect.width,
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result.mRect.height, result.mHasFloats);
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}
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#endif
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return result;
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}
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nsFlowAreaRect
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nsBlockReflowState::GetFloatAvailableSpaceForHeight(
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nscoord aY, nscoord aHeight,
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nsFloatManager::SavedState *aState) const
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{
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#ifdef DEBUG
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// Verify that the caller setup the coordinate system properly
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nscoord wx, wy;
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mFloatManager->GetTranslation(wx, wy);
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NS_ASSERTION((wx == mFloatManagerX) && (wy == mFloatManagerY),
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"bad coord system");
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#endif
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nsFlowAreaRect result =
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mFloatManager->GetFlowArea(aY - BorderPadding().top,
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nsFloatManager::WIDTH_WITHIN_HEIGHT,
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aHeight, mContentArea.width, aState);
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// Keep the width >= 0 for compatibility with nsSpaceManager.
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if (result.mRect.width < 0)
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result.mRect.width = 0;
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#ifdef DEBUG
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if (nsBlockFrame::gNoisyReflow) {
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nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
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printf("GetAvailableSpaceForHeight: space=%d,%d,%d,%d hasfloats=%d\n",
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result.mRect.x, result.mRect.y, result.mRect.width,
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result.mRect.height, result.mHasFloats);
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}
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#endif
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return result;
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}
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/*
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* Reconstruct the vertical margin before the line |aLine| in order to
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* do an incremental reflow that begins with |aLine| without reflowing
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* the line before it. |aLine| may point to the fencepost at the end of
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* the line list, and it is used this way since we (for now, anyway)
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* always need to recover margins at the end of a block.
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*
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* The reconstruction involves walking backward through the line list to
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* find any collapsed margins preceding the line that would have been in
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* the reflow state's |mPrevBottomMargin| when we reflowed that line in
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* a full reflow (under the rule in CSS2 that all adjacent vertical
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* margins of blocks collapse).
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*/
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void
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nsBlockReflowState::ReconstructMarginAbove(nsLineList::iterator aLine)
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{
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mPrevBottomMargin.Zero();
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nsBlockFrame *block = mBlock;
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nsLineList::iterator firstLine = block->begin_lines();
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for (;;) {
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--aLine;
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if (aLine->IsBlock()) {
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mPrevBottomMargin = aLine->GetCarriedOutBottomMargin();
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break;
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}
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if (!aLine->IsEmpty()) {
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break;
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}
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if (aLine == firstLine) {
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// If the top margin was carried out (and thus already applied),
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// set it to zero. Either way, we're done.
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if (!GetFlag(BRS_ISTOPMARGINROOT)) {
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mPrevBottomMargin.Zero();
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}
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break;
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}
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}
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}
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|
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void
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nsBlockReflowState::SetupFloatContinuationList()
|
|
{
|
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if (!GetFlag(BRS_PROPTABLE_FLOATCLIST)) {
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mPresContext->PropertyTable()->
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Set(mBlock, nsBlockFrame::FloatContinuationProperty(),
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&mFloatContinuations);
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SetFlag(BRS_PROPTABLE_FLOATCLIST, PR_TRUE);
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}
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}
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|
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/**
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|
* Restore information about floats into the float manager for an
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* incremental reflow, and simultaneously push the floats by
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* |aDeltaY|, which is the amount |aLine| was pushed relative to its
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* parent. The recovery of state is one of the things that makes
|
|
* incremental reflow O(N^2) and this state should really be kept
|
|
* around, attached to the frame tree.
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|
*/
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void
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nsBlockReflowState::RecoverFloats(nsLineList::iterator aLine,
|
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nscoord aDeltaY)
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|
{
|
|
if (aLine->HasFloats()) {
|
|
// Place the floats into the space-manager again. Also slide
|
|
// them, just like the regular frames on the line.
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nsFloatCache* fc = aLine->GetFirstFloat();
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while (fc) {
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nsIFrame* floatFrame = fc->mFloat;
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if (aDeltaY != 0) {
|
|
nsPoint p = floatFrame->GetPosition();
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floatFrame->SetPosition(nsPoint(p.x, p.y + aDeltaY));
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nsContainerFrame::PositionFrameView(floatFrame);
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|
nsContainerFrame::PositionChildViews(floatFrame);
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}
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|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow || nsBlockFrame::gNoisyFloatManager) {
|
|
nscoord tx, ty;
|
|
mFloatManager->GetTranslation(tx, ty);
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("RecoverFloats: txy=%d,%d (%d,%d) ",
|
|
tx, ty, mFloatManagerX, mFloatManagerY);
|
|
nsFrame::ListTag(stdout, floatFrame);
|
|
nsRect region = nsFloatManager::GetRegionFor(floatFrame);
|
|
printf(" aDeltaY=%d region={%d,%d,%d,%d}\n",
|
|
aDeltaY, region.x, region.y, region.width, region.height);
|
|
}
|
|
#endif
|
|
mFloatManager->AddFloat(floatFrame,
|
|
nsFloatManager::GetRegionFor(floatFrame));
|
|
fc = fc->Next();
|
|
}
|
|
} else if (aLine->IsBlock()) {
|
|
nsBlockFrame::RecoverFloatsFor(aLine->mFirstChild, *mFloatManager);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Everything done in this function is done O(N) times for each pass of
|
|
* reflow so it is O(N*M) where M is the number of incremental reflow
|
|
* passes. That's bad. Don't do stuff here.
|
|
*
|
|
* When this function is called, |aLine| has just been slid by |aDeltaY|
|
|
* and the purpose of RecoverStateFrom is to ensure that the
|
|
* nsBlockReflowState is in the same state that it would have been in
|
|
* had the line just been reflowed.
|
|
*
|
|
* Most of the state recovery that we have to do involves floats.
|
|
*/
|
|
void
|
|
nsBlockReflowState::RecoverStateFrom(nsLineList::iterator aLine,
|
|
nscoord aDeltaY)
|
|
{
|
|
// Make the line being recovered the current line
|
|
mCurrentLine = aLine;
|
|
|
|
// Place floats for this line into the float manager
|
|
if (aLine->HasFloats() || aLine->IsBlock()) {
|
|
// Undo border/padding translation since the nsFloatCache's
|
|
// coordinates are relative to the frame not relative to the
|
|
// border/padding.
|
|
const nsMargin& bp = BorderPadding();
|
|
mFloatManager->Translate(-bp.left, -bp.top);
|
|
|
|
RecoverFloats(aLine, aDeltaY);
|
|
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow || nsBlockFrame::gNoisyFloatManager) {
|
|
mFloatManager->List(stdout);
|
|
}
|
|
#endif
|
|
// And then put the translation back again
|
|
mFloatManager->Translate(bp.left, bp.top);
|
|
}
|
|
}
|
|
|
|
// This is called by the line layout's AddFloat method when a
|
|
// place-holder frame is reflowed in a line. If the float is a
|
|
// left-most child (it's x coordinate is at the line's left margin)
|
|
// then the float is place immediately, otherwise the float
|
|
// placement is deferred until the line has been reflowed.
|
|
|
|
// XXXldb This behavior doesn't quite fit with CSS1 and CSS2 --
|
|
// technically we're supposed let the current line flow around the
|
|
// float as well unless it won't fit next to what we already have.
|
|
// But nobody else implements it that way...
|
|
PRBool
|
|
nsBlockReflowState::AddFloat(nsLineLayout* aLineLayout,
|
|
nsIFrame* aFloat,
|
|
nscoord aAvailableWidth,
|
|
nsReflowStatus& aReflowStatus)
|
|
{
|
|
NS_PRECONDITION(!aLineLayout || mBlock->end_lines() != mCurrentLine, "null ptr");
|
|
NS_PRECONDITION(aFloat->GetStateBits() & NS_FRAME_OUT_OF_FLOW,
|
|
"aFloat must be an out-of-flow frame");
|
|
|
|
// Set the geometric parent of the float
|
|
aFloat->SetParent(mBlock);
|
|
|
|
aReflowStatus = NS_FRAME_COMPLETE;
|
|
|
|
// Because we are in the middle of reflowing a placeholder frame
|
|
// within a line (and possibly nested in an inline frame or two
|
|
// that's a child of our block) we need to restore the space
|
|
// manager's translation to the space that the block resides in
|
|
// before placing the float.
|
|
nscoord ox, oy;
|
|
mFloatManager->GetTranslation(ox, oy);
|
|
nscoord dx = ox - mFloatManagerX;
|
|
nscoord dy = oy - mFloatManagerY;
|
|
mFloatManager->Translate(-dx, -dy);
|
|
|
|
PRBool placed;
|
|
|
|
// Now place the float immediately if possible. Otherwise stash it
|
|
// away in mPendingFloats and place it later.
|
|
// If one or more floats has already been pushed to the next line,
|
|
// don't let this one go on the current line, since that would violate
|
|
// float ordering.
|
|
nsRect floatAvailableSpace = GetFloatAvailableSpace().mRect;
|
|
if (!aLineLayout ||
|
|
(mBelowCurrentLineFloats.IsEmpty() &&
|
|
(aLineLayout->LineIsEmpty() ||
|
|
mBlock->ComputeFloatWidth(*this, floatAvailableSpace, aFloat)
|
|
<= aAvailableWidth))) {
|
|
// And then place it
|
|
// force it to fit if we're at the top of the block and we can't
|
|
// break before this
|
|
PRBool forceFit = !aLineLayout ||
|
|
(IsAdjacentWithTop() && !aLineLayout->LineIsBreakable());
|
|
placed = FlowAndPlaceFloat(aFloat, aReflowStatus, forceFit);
|
|
NS_ASSERTION(placed || !forceFit,
|
|
"If we asked for force-fit, it should have been placed");
|
|
if (forceFit || (placed && !NS_FRAME_IS_TRUNCATED(aReflowStatus))) {
|
|
// Pass on updated available space to the current inline reflow engine
|
|
nsFlowAreaRect floatAvailSpace =
|
|
GetFloatAvailableSpace(mY, forceFit);
|
|
nsRect availSpace(nsPoint(floatAvailSpace.mRect.x + BorderPadding().left,
|
|
mY),
|
|
floatAvailSpace.mRect.Size());
|
|
if (aLineLayout) {
|
|
aLineLayout->UpdateBand(availSpace, aFloat);
|
|
// Record this float in the current-line list
|
|
mCurrentLineFloats.Append(mFloatCacheFreeList.Alloc(aFloat));
|
|
}
|
|
// If we can't break here, hide the fact that it's truncated
|
|
// XXX We can probably do this more cleanly
|
|
aReflowStatus &= ~NS_FRAME_TRUNCATED;
|
|
}
|
|
else {
|
|
if (IsAdjacentWithTop()) {
|
|
// Pushing the line to the next page won't give us any more space;
|
|
// therefore, we break.
|
|
NS_ASSERTION(aLineLayout->LineIsBreakable(),
|
|
"We can't get here unless forceFit is false");
|
|
aReflowStatus = NS_INLINE_LINE_BREAK_BEFORE();
|
|
} else {
|
|
// Make sure we propagate the truncated status; this signals the
|
|
// block to push the line to the next page.
|
|
aReflowStatus |= NS_FRAME_TRUNCATED;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
// Always claim to be placed; we don't know whether we fit yet, so we
|
|
// deal with this in PlaceBelowCurrentLineFloats
|
|
placed = PR_TRUE;
|
|
// This float will be placed after the line is done (it is a
|
|
// below-current-line float).
|
|
mBelowCurrentLineFloats.Append(mFloatCacheFreeList.Alloc(aFloat));
|
|
}
|
|
|
|
// Restore coordinate system
|
|
mFloatManager->Translate(dx, dy);
|
|
|
|
return placed;
|
|
}
|
|
|
|
PRBool
|
|
nsBlockReflowState::CanPlaceFloat(const nsSize& aFloatSize, PRUint8 aFloats,
|
|
const nsFlowAreaRect& aFloatAvailableSpace,
|
|
PRBool aForceFit)
|
|
{
|
|
// If the current Y coordinate is not impacted by any floats
|
|
// then by definition the float fits.
|
|
PRBool result = PR_TRUE;
|
|
if (aFloatAvailableSpace.mHasFloats) {
|
|
// XXX We should allow overflow by up to half a pixel here (bug 21193).
|
|
if (aFloatAvailableSpace.mRect.width < aFloatSize.width) {
|
|
// The available width is too narrow (and it's been impacted by a
|
|
// prior float)
|
|
result = PR_FALSE;
|
|
}
|
|
}
|
|
|
|
if (!result)
|
|
return result;
|
|
|
|
// At this point we know that there is enough horizontal space for
|
|
// the float (somewhere). Lets see if there is enough vertical
|
|
// space.
|
|
if (NSCoordGreaterThan(aFloatSize.height,
|
|
aFloatAvailableSpace.mRect.height)) {
|
|
// The available height is too short. However, it's possible that
|
|
// there is enough open space below which is not impacted by a
|
|
// float.
|
|
//
|
|
// Compute the X coordinate for the float based on its float
|
|
// type, assuming it's placed on the current line. This is
|
|
// where the float will be placed horizontally if it can go
|
|
// here.
|
|
nscoord xa;
|
|
if (NS_STYLE_FLOAT_LEFT == aFloats) {
|
|
xa = aFloatAvailableSpace.mRect.x;
|
|
}
|
|
else {
|
|
xa = aFloatAvailableSpace.mRect.XMost() - aFloatSize.width;
|
|
|
|
// In case the float is too big, don't go past the left edge
|
|
// XXXldb This seems wrong, but we might want to fix bug 6976
|
|
// first.
|
|
if (xa < aFloatAvailableSpace.mRect.x) {
|
|
xa = aFloatAvailableSpace.mRect.x;
|
|
}
|
|
}
|
|
nscoord xb = xa + aFloatSize.width;
|
|
|
|
// Calculate the top and bottom y coordinates, again assuming
|
|
// that the float is placed on the current line.
|
|
const nsMargin& borderPadding = BorderPadding();
|
|
nscoord ya = mY - borderPadding.top;
|
|
if (ya < 0) {
|
|
// CSS2 spec, 9.5.1 rule [4]: "A floating box's outer top may not
|
|
// be higher than the top of its containing block." (Since the
|
|
// containing block is the content edge of the block box, this
|
|
// means the margin edge of the float can't be higher than the
|
|
// content edge of the block that contains it.)
|
|
ya = 0;
|
|
}
|
|
nscoord yb = ya + aFloatSize.height;
|
|
|
|
nscoord saveY = mY;
|
|
nsFlowAreaRect floatAvailableSpace(aFloatAvailableSpace);
|
|
for (;;) {
|
|
// Get the available space at the new Y coordinate
|
|
if (floatAvailableSpace.mRect.height <= 0) {
|
|
// there is no more available space. We lose.
|
|
result = PR_FALSE;
|
|
break;
|
|
}
|
|
|
|
mY += floatAvailableSpace.mRect.height;
|
|
floatAvailableSpace = GetFloatAvailableSpace(mY, aForceFit);
|
|
|
|
if (floatAvailableSpace.mHasFloats) {
|
|
if (xa < floatAvailableSpace.mRect.x ||
|
|
xb > floatAvailableSpace.mRect.XMost()) {
|
|
// The float can't go here.
|
|
result = PR_FALSE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// See if there is now enough height for the float.
|
|
if (yb <= mY + floatAvailableSpace.mRect.height) {
|
|
// Winner. The bottom Y coordinate of the float is in
|
|
// this band.
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Restore Y coordinate
|
|
mY = saveY;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
PRBool
|
|
nsBlockReflowState::FlowAndPlaceFloat(nsIFrame* aFloat,
|
|
nsReflowStatus& aReflowStatus,
|
|
PRBool aForceFit)
|
|
{
|
|
aReflowStatus = NS_FRAME_COMPLETE;
|
|
// Save away the Y coordinate before placing the float. We will
|
|
// restore mY at the end after placing the float. This is
|
|
// necessary because any adjustments to mY during the float
|
|
// placement are for the float only, not for any non-floating
|
|
// content.
|
|
nscoord saveY = mY;
|
|
|
|
// Grab the float's display information
|
|
const nsStyleDisplay* floatDisplay = aFloat->GetStyleDisplay();
|
|
|
|
// The float's old region, so we can propagate damage.
|
|
nsRect oldRegion = nsFloatManager::GetRegionFor(aFloat);
|
|
|
|
// Enforce CSS2 9.5.1 rule [2], i.e., make sure that a float isn't
|
|
// ``above'' another float that preceded it in the flow.
|
|
mY = NS_MAX(mFloatManager->GetLowestFloatTop() + BorderPadding().top, mY);
|
|
|
|
// See if the float should clear any preceding floats...
|
|
// XXX We need to mark this float somehow so that it gets reflowed
|
|
// when floats are inserted before it.
|
|
if (NS_STYLE_CLEAR_NONE != floatDisplay->mBreakType) {
|
|
// XXXldb Does this handle vertical margins correctly?
|
|
mY = ClearFloats(mY, floatDisplay->mBreakType);
|
|
}
|
|
// Get the band of available space
|
|
nsFlowAreaRect floatAvailableSpace = GetFloatAvailableSpace(mY, aForceFit);
|
|
|
|
NS_ASSERTION(aFloat->GetParent() == mBlock,
|
|
"Float frame has wrong parent");
|
|
|
|
// Reflow the float
|
|
nsMargin floatMargin; // computed margin
|
|
mBlock->ReflowFloat(*this, floatAvailableSpace.mRect, aFloat,
|
|
floatMargin, aReflowStatus);
|
|
if (aFloat->GetPrevInFlow())
|
|
floatMargin.top = 0;
|
|
if (NS_FRAME_IS_NOT_COMPLETE(aReflowStatus))
|
|
floatMargin.bottom = 0;
|
|
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsRect region = aFloat->GetRect();
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("flowed float: ");
|
|
nsFrame::ListTag(stdout, aFloat);
|
|
printf(" (%d,%d,%d,%d)\n",
|
|
region.x, region.y, region.width, region.height);
|
|
}
|
|
#endif
|
|
|
|
nsSize floatSize = aFloat->GetSize() +
|
|
nsSize(floatMargin.LeftRight(), floatMargin.TopBottom());
|
|
|
|
// Find a place to place the float. The CSS2 spec doesn't want
|
|
// floats overlapping each other or sticking out of the containing
|
|
// block if possible (CSS2 spec section 9.5.1, see the rule list).
|
|
NS_ASSERTION((NS_STYLE_FLOAT_LEFT == floatDisplay->mFloats) ||
|
|
(NS_STYLE_FLOAT_RIGHT == floatDisplay->mFloats),
|
|
"invalid float type");
|
|
|
|
// Can the float fit here?
|
|
PRBool keepFloatOnSameLine = PR_FALSE;
|
|
|
|
while (!CanPlaceFloat(floatSize, floatDisplay->mFloats, floatAvailableSpace,
|
|
aForceFit)) {
|
|
if (floatAvailableSpace.mRect.height <= 0) {
|
|
// No space, nowhere to put anything.
|
|
mY = saveY;
|
|
return PR_FALSE;
|
|
}
|
|
|
|
// Nope. try to advance to the next band.
|
|
if (NS_STYLE_DISPLAY_TABLE != floatDisplay->mDisplay ||
|
|
eCompatibility_NavQuirks != mPresContext->CompatibilityMode() ) {
|
|
|
|
mY += floatAvailableSpace.mRect.height;
|
|
floatAvailableSpace = GetFloatAvailableSpace(mY, aForceFit);
|
|
} else {
|
|
// This quirk matches the one in nsBlockFrame::ReflowFloat
|
|
// IE handles float tables in a very special way
|
|
|
|
// see if the previous float is also a table and has "align"
|
|
nsFloatCache* fc = mCurrentLineFloats.Head();
|
|
nsIFrame* prevFrame = nsnull;
|
|
while (fc) {
|
|
if (fc->mFloat == aFloat) {
|
|
break;
|
|
}
|
|
prevFrame = fc->mFloat;
|
|
fc = fc->Next();
|
|
}
|
|
|
|
if(prevFrame) {
|
|
//get the frame type
|
|
if (nsGkAtoms::tableOuterFrame == prevFrame->GetType()) {
|
|
//see if it has "align="
|
|
// IE makes a difference between align and he float property
|
|
nsIContent* content = prevFrame->GetContent();
|
|
if (content) {
|
|
// we're interested only if previous frame is align=left
|
|
// IE messes things up when "right" (overlapping frames)
|
|
if (content->AttrValueIs(kNameSpaceID_None, nsGkAtoms::align,
|
|
NS_LITERAL_STRING("left"), eIgnoreCase)) {
|
|
keepFloatOnSameLine = PR_TRUE;
|
|
// don't advance to next line (IE quirkie behaviour)
|
|
// it breaks rule CSS2/9.5.1/1, but what the hell
|
|
// since we cannot evangelize the world
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// the table does not fit anymore in this line so advance to next band
|
|
mY += floatAvailableSpace.mRect.height;
|
|
floatAvailableSpace = GetFloatAvailableSpace(mY, aForceFit);
|
|
// reflow the float again now since we have more space
|
|
// XXXldb We really don't need to Reflow in a loop, we just need
|
|
// to ComputeSize in a loop (once ComputeSize depends on
|
|
// availableWidth, which should make this work again).
|
|
mBlock->ReflowFloat(*this, floatAvailableSpace.mRect, aFloat,
|
|
floatMargin, aReflowStatus);
|
|
// Get the floats bounding box and margin information
|
|
floatSize = aFloat->GetSize() +
|
|
nsSize(floatMargin.LeftRight(), floatMargin.TopBottom());
|
|
}
|
|
}
|
|
// If the float is continued, it will get the same absolute x value as its prev-in-flow
|
|
|
|
// We don't worry about the geometry of the prev in flow, let the continuation
|
|
// place and size itself as required.
|
|
|
|
// Assign an x and y coordinate to the float. Note that the x,y
|
|
// coordinates are computed <b>relative to the translation in the
|
|
// spacemanager</b> which means that the impacted region will be
|
|
// <b>inside</b> the border/padding area.
|
|
nscoord floatX, floatY;
|
|
if (NS_STYLE_FLOAT_LEFT == floatDisplay->mFloats) {
|
|
floatX = floatAvailableSpace.mRect.x;
|
|
}
|
|
else {
|
|
if (!keepFloatOnSameLine) {
|
|
floatX = floatAvailableSpace.mRect.XMost() - floatSize.width;
|
|
}
|
|
else {
|
|
// this is the IE quirk (see few lines above)
|
|
// the table is kept in the same line: don't let it overlap the
|
|
// previous float
|
|
floatX = floatAvailableSpace.mRect.x;
|
|
}
|
|
}
|
|
const nsMargin& borderPadding = BorderPadding();
|
|
floatY = mY - borderPadding.top;
|
|
if (floatY < 0) {
|
|
// CSS2 spec, 9.5.1 rule [4]: "A floating box's outer top may not
|
|
// be higher than the top of its containing block." (Since the
|
|
// containing block is the content edge of the block box, this
|
|
// means the margin edge of the float can't be higher than the
|
|
// content edge of the block that contains it.)
|
|
floatY = 0;
|
|
}
|
|
|
|
// Calculate the actual origin of the float frame's border rect
|
|
// relative to the parent block; floatX/Y must be converted from space-manager
|
|
// coordinates to parent coordinates, and the margin must be added in
|
|
// to get the border rect
|
|
nsPoint origin(borderPadding.left + floatMargin.left + floatX,
|
|
borderPadding.top + floatMargin.top + floatY);
|
|
|
|
// If float is relatively positioned, factor that in as well
|
|
origin += aFloat->GetRelativeOffset(floatDisplay);
|
|
|
|
// Position the float and make sure and views are properly
|
|
// positioned. We need to explicitly position its child views as
|
|
// well, since we're moving the float after flowing it.
|
|
aFloat->SetPosition(origin);
|
|
nsContainerFrame::PositionFrameView(aFloat);
|
|
nsContainerFrame::PositionChildViews(aFloat);
|
|
|
|
// Update the float combined area state
|
|
nsRect combinedArea = aFloat->GetOverflowRect() + origin;
|
|
|
|
// XXX Floats should really just get invalidated here if necessary
|
|
mFloatCombinedArea.UnionRect(combinedArea, mFloatCombinedArea);
|
|
|
|
// Place the float in the float manager
|
|
// calculate region
|
|
nsRect region = nsFloatManager::CalculateRegionFor(aFloat, floatMargin);
|
|
// if the float split, then take up all of the vertical height
|
|
if (NS_FRAME_IS_NOT_COMPLETE(aReflowStatus) &&
|
|
(NS_UNCONSTRAINEDSIZE != mContentArea.height)) {
|
|
region.height = NS_MAX(region.height, mContentArea.height - floatY);
|
|
}
|
|
nsresult rv =
|
|
// spacemanager translation is inset by the border+padding.
|
|
mFloatManager->AddFloat(aFloat,
|
|
region - nsPoint(borderPadding.left, borderPadding.top));
|
|
NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv), "bad float placement");
|
|
// store region
|
|
rv = nsFloatManager::StoreRegionFor(aFloat, region);
|
|
NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv), "float region storage failed");
|
|
|
|
// If the float's dimensions have changed, note the damage in the
|
|
// float manager.
|
|
if (region != oldRegion) {
|
|
// XXXwaterson conservative: we could probably get away with noting
|
|
// less damage; e.g., if only height has changed, then only note the
|
|
// area into which the float has grown or from which the float has
|
|
// shrunk.
|
|
nscoord top = NS_MIN(region.y, oldRegion.y) - borderPadding.top;
|
|
nscoord bottom = NS_MAX(region.YMost(), oldRegion.YMost()) - borderPadding.top;
|
|
mFloatManager->IncludeInDamage(top, bottom);
|
|
}
|
|
|
|
#ifdef NOISY_FLOATMANAGER
|
|
nscoord tx, ty;
|
|
mFloatManager->GetTranslation(tx, ty);
|
|
nsFrame::ListTag(stdout, mBlock);
|
|
printf(": FlowAndPlaceFloat: AddFloat: txy=%d,%d (%d,%d) {%d,%d,%d,%d}\n",
|
|
tx, ty, mFloatManagerX, mFloatManagerY,
|
|
region.x, region.y, region.width, region.height);
|
|
#endif
|
|
|
|
// Now restore mY
|
|
mY = saveY;
|
|
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsRect r = aFloat->GetRect();
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("placed float: ");
|
|
nsFrame::ListTag(stdout, aFloat);
|
|
printf(" %d,%d,%d,%d\n", r.x, r.y, r.width, r.height);
|
|
}
|
|
#endif
|
|
|
|
return PR_TRUE;
|
|
}
|
|
|
|
/**
|
|
* Place below-current-line floats.
|
|
*/
|
|
PRBool
|
|
nsBlockReflowState::PlaceBelowCurrentLineFloats(nsFloatCacheFreeList& aList, PRBool aForceFit)
|
|
{
|
|
nsFloatCache* fc = aList.Head();
|
|
while (fc) {
|
|
{
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("placing bcl float: ");
|
|
nsFrame::ListTag(stdout, fc->mFloat);
|
|
printf("\n");
|
|
}
|
|
#endif
|
|
// Place the float
|
|
nsReflowStatus reflowStatus;
|
|
PRBool placed = FlowAndPlaceFloat(fc->mFloat, reflowStatus, aForceFit);
|
|
NS_ASSERTION(placed || !aForceFit,
|
|
"If we're in force-fit mode, we should have placed the float");
|
|
|
|
if (!placed || (NS_FRAME_IS_TRUNCATED(reflowStatus) && !aForceFit)) {
|
|
// return before processing all of the floats, since the line will be pushed.
|
|
return PR_FALSE;
|
|
}
|
|
else if (!NS_FRAME_IS_FULLY_COMPLETE(reflowStatus)) {
|
|
// Create a continuation for the incomplete float
|
|
nsresult rv = mBlock->SplitFloat(*this, fc->mFloat, reflowStatus);
|
|
if (NS_FAILED(rv))
|
|
return PR_FALSE;
|
|
} else {
|
|
// XXX We could deal with truncated frames better by breaking before
|
|
// the associated placeholder
|
|
NS_WARN_IF_FALSE(!NS_FRAME_IS_TRUNCATED(reflowStatus),
|
|
"This situation currently leads to data not printing");
|
|
// Float is complete.
|
|
}
|
|
}
|
|
fc = fc->Next();
|
|
}
|
|
return PR_TRUE;
|
|
}
|
|
|
|
nscoord
|
|
nsBlockReflowState::ClearFloats(nscoord aY, PRUint8 aBreakType,
|
|
nsIFrame *aReplacedBlock)
|
|
{
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("clear floats: in: aY=%d(%d)\n",
|
|
aY, aY - BorderPadding().top);
|
|
}
|
|
#endif
|
|
|
|
#ifdef NOISY_FLOAT_CLEARING
|
|
printf("nsBlockReflowState::ClearFloats: aY=%d breakType=%d\n",
|
|
aY, aBreakType);
|
|
mFloatManager->List(stdout);
|
|
#endif
|
|
|
|
const nsMargin& bp = BorderPadding();
|
|
nscoord newY = aY;
|
|
|
|
if (aBreakType != NS_STYLE_CLEAR_NONE) {
|
|
newY = bp.top + mFloatManager->ClearFloats(newY - bp.top, aBreakType);
|
|
}
|
|
|
|
if (aReplacedBlock) {
|
|
for (;;) {
|
|
nsFlowAreaRect floatAvailableSpace =
|
|
GetFloatAvailableSpace(newY, PR_FALSE);
|
|
nsBlockFrame::ReplacedElementWidthToClear replacedWidth =
|
|
nsBlockFrame::WidthToClearPastFloats(*this, floatAvailableSpace.mRect,
|
|
aReplacedBlock);
|
|
if (!floatAvailableSpace.mHasFloats ||
|
|
NS_MAX(floatAvailableSpace.mRect.x, replacedWidth.marginLeft) +
|
|
replacedWidth.borderBoxWidth +
|
|
NS_MAX(mContentArea.width -
|
|
NS_MIN(mContentArea.width,
|
|
floatAvailableSpace.mRect.XMost()),
|
|
replacedWidth.marginRight) <=
|
|
mContentArea.width) {
|
|
break;
|
|
}
|
|
// See the analogous code for inlines in nsBlockFrame::DoReflowInlineFrames
|
|
if (floatAvailableSpace.mRect.height > 0) {
|
|
// See if there's room in the next band.
|
|
newY += floatAvailableSpace.mRect.height;
|
|
} else {
|
|
if (mReflowState.availableHeight != NS_UNCONSTRAINEDSIZE) {
|
|
// Stop trying to clear here; we'll just get pushed to the
|
|
// next column or page and try again there.
|
|
break;
|
|
}
|
|
NS_NOTREACHED("avail space rect with zero height!");
|
|
newY += 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("clear floats: out: y=%d(%d)\n", newY, newY - bp.top);
|
|
}
|
|
#endif
|
|
|
|
return newY;
|
|
}
|
|
|