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416 lines
16 KiB
C++
416 lines
16 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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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* class that a parent frame uses to reflow a block frame */
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#include "nsBlockReflowContext.h"
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#include "nsLineLayout.h"
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#include "nsFloatManager.h"
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#include "nsPresContext.h"
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#include "nsFrameManager.h"
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#include "nsIContent.h"
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#include "nsStyleContext.h"
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#include "nsContainerFrame.h"
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#include "nsBlockFrame.h"
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#include "nsLineBox.h"
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#include "nsIDOMHTMLTableCellElement.h"
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#include "nsIDOMHTMLBodyElement.h"
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#include "nsGkAtoms.h"
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#include "nsCOMPtr.h"
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#include "nsLayoutUtils.h"
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#ifdef DEBUG
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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_VERTICAL_MARGINS
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#else
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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_VERTICAL_MARGINS
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#endif
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nsBlockReflowContext::nsBlockReflowContext(nsPresContext* aPresContext,
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const nsHTMLReflowState& aParentRS)
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: mPresContext(aPresContext),
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mOuterReflowState(aParentRS),
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mMetrics()
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{
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}
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static nsIFrame* DescendIntoBlockLevelFrame(nsIFrame* aFrame)
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{
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nsIAtom* type = aFrame->GetType();
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if (type == nsGkAtoms::columnSetFrame)
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return DescendIntoBlockLevelFrame(aFrame->GetFirstPrincipalChild());
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return aFrame;
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}
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bool
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nsBlockReflowContext::ComputeCollapsedTopMargin(const nsHTMLReflowState& aRS,
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nsCollapsingMargin* aMargin, nsIFrame* aClearanceFrame,
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bool* aMayNeedRetry, bool* aBlockIsEmpty)
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{
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// Include frame's top margin
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aMargin->Include(aRS.mComputedMargin.top);
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// The inclusion of the bottom margin when empty is done by the caller
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// since it doesn't need to be done by the top-level (non-recursive)
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// caller.
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#ifdef NOISY_VERTICAL_MARGINS
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nsFrame::ListTag(stdout, aRS.frame);
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printf(": %d => %d\n", aRS.mComputedMargin.top, aMargin->get());
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#endif
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bool dirtiedLine = false;
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bool setBlockIsEmpty = false;
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// Calculate the frame's generational top-margin from its child
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// blocks. Note that if the frame has a non-zero top-border or
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// top-padding then this step is skipped because it will be a margin
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// root. It is also skipped if the frame is a margin root for other
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// reasons.
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nsIFrame* frame = DescendIntoBlockLevelFrame(aRS.frame);
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nsPresContext* prescontext = frame->PresContext();
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nsBlockFrame* block = nullptr;
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if (0 == aRS.mComputedBorderPadding.top) {
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block = nsLayoutUtils::GetAsBlock(frame);
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if (block) {
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bool topMarginRoot, unused;
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block->IsMarginRoot(&topMarginRoot, &unused);
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if (topMarginRoot) {
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block = nullptr;
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}
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}
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}
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// iterate not just through the lines of 'block' but also its
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// overflow lines and the normal and overflow lines of its next in
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// flows. Note that this will traverse some frames more than once:
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// for example, if A contains B and A->nextinflow contains
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// B->nextinflow, we'll traverse B->nextinflow twice. But this is
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// OK because our traversal is idempotent.
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for ( ;block; block = static_cast<nsBlockFrame*>(block->GetNextInFlow())) {
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for (int overflowLines = false; overflowLines <= true; ++overflowLines) {
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nsBlockFrame::line_iterator line;
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nsBlockFrame::line_iterator line_end;
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bool anyLines = true;
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if (overflowLines) {
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nsBlockFrame::FrameLines* frames = block->GetOverflowLines();
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nsLineList* lines = frames ? &frames->mLines : nullptr;
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if (!lines) {
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anyLines = false;
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} else {
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line = lines->begin();
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line_end = lines->end();
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}
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} else {
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line = block->begin_lines();
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line_end = block->end_lines();
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}
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for (; anyLines && line != line_end; ++line) {
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if (!aClearanceFrame && line->HasClearance()) {
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// If we don't have a clearance frame, then we're computing
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// the collapsed margin in the first pass, assuming that all
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// lines have no clearance. So clear their clearance flags.
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line->ClearHasClearance();
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line->MarkDirty();
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dirtiedLine = true;
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}
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bool isEmpty;
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if (line->IsInline()) {
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isEmpty = line->IsEmpty();
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} else {
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nsIFrame* kid = line->mFirstChild;
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if (kid == aClearanceFrame) {
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line->SetHasClearance();
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line->MarkDirty();
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dirtiedLine = true;
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goto done;
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}
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// Here is where we recur. Now that we have determined that a
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// generational collapse is required we need to compute the
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// child blocks margin and so in so that we can look into
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// it. For its margins to be computed we need to have a reflow
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// state for it.
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// We may have to construct an extra reflow state here if
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// we drilled down through a block wrapper. At the moment
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// we can only drill down one level so we only have to support
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// one extra reflow state.
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const nsHTMLReflowState* outerReflowState = &aRS;
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if (frame != aRS.frame) {
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NS_ASSERTION(frame->GetParent() == aRS.frame,
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"Can only drill through one level of block wrapper");
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nsSize availSpace(aRS.ComputedWidth(), aRS.ComputedHeight());
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outerReflowState = new nsHTMLReflowState(prescontext,
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aRS, frame, availSpace);
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}
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{
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nsSize availSpace(outerReflowState->ComputedWidth(),
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outerReflowState->ComputedHeight());
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nsHTMLReflowState innerReflowState(prescontext,
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*outerReflowState, kid,
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availSpace);
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// Record that we're being optimistic by assuming the kid
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// has no clearance
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if (kid->GetStyleDisplay()->mBreakType != NS_STYLE_CLEAR_NONE) {
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*aMayNeedRetry = true;
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}
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if (ComputeCollapsedTopMargin(innerReflowState, aMargin, aClearanceFrame, aMayNeedRetry, &isEmpty)) {
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line->MarkDirty();
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dirtiedLine = true;
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}
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if (isEmpty)
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aMargin->Include(innerReflowState.mComputedMargin.bottom);
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}
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if (outerReflowState != &aRS) {
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delete const_cast<nsHTMLReflowState*>(outerReflowState);
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}
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}
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if (!isEmpty) {
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if (!setBlockIsEmpty && aBlockIsEmpty) {
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setBlockIsEmpty = true;
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*aBlockIsEmpty = false;
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}
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goto done;
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}
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}
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if (!setBlockIsEmpty && aBlockIsEmpty) {
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// The first time we reach here is when this is the first block
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// and we have processed all its normal lines.
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setBlockIsEmpty = true;
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// All lines are empty, or we wouldn't be here!
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*aBlockIsEmpty = aRS.frame->IsSelfEmpty();
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}
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}
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}
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done:
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if (!setBlockIsEmpty && aBlockIsEmpty) {
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*aBlockIsEmpty = aRS.frame->IsEmpty();
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}
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#ifdef NOISY_VERTICAL_MARGINS
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nsFrame::ListTag(stdout, aRS.frame);
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printf(": => %d\n", aMargin->get());
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#endif
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return dirtiedLine;
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}
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nsresult
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nsBlockReflowContext::ReflowBlock(const nsRect& aSpace,
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bool aApplyTopMargin,
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nsCollapsingMargin& aPrevMargin,
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nscoord aClearance,
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bool aIsAdjacentWithTop,
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nsLineBox* aLine,
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nsHTMLReflowState& aFrameRS,
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nsReflowStatus& aFrameReflowStatus,
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nsBlockReflowState& aState)
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{
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nsresult rv = NS_OK;
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mFrame = aFrameRS.frame;
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mSpace = aSpace;
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if (!aIsAdjacentWithTop) {
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aFrameRS.mFlags.mIsTopOfPage = false; // make sure this is cleared
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}
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if (aApplyTopMargin) {
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mTopMargin = aPrevMargin;
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#ifdef NOISY_VERTICAL_MARGINS
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nsFrame::ListTag(stdout, mOuterReflowState.frame);
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printf(": reflowing ");
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nsFrame::ListTag(stdout, mFrame);
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printf(" margin => %d, clearance => %d\n", mTopMargin.get(), aClearance);
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#endif
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// Adjust the available height if its constrained so that the
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// child frame doesn't think it can reflow into its margin area.
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if (NS_UNCONSTRAINEDSIZE != aFrameRS.availableHeight) {
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aFrameRS.availableHeight -= mTopMargin.get() + aClearance;
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}
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}
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nscoord tx = 0, ty = 0;
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// The values of x and y do not matter for floats, so don't bother calculating
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// them. Floats are guaranteed to have their own float manager, so tx and ty
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// don't matter. mX and mY don't matter becacuse they are only used in
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// PlaceBlock, which is not used for floats.
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if (aLine) {
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// Compute x/y coordinate where reflow will begin. Use the rules
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// from 10.3.3 to determine what to apply. At this point in the
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// reflow auto left/right margins will have a zero value.
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mX = tx = mSpace.x + aFrameRS.mComputedMargin.left;
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mY = ty = mSpace.y + mTopMargin.get() + aClearance;
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if ((mFrame->GetStateBits() & NS_BLOCK_FLOAT_MGR) == 0)
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aFrameRS.mBlockDelta = mOuterReflowState.mBlockDelta + ty - aLine->mBounds.y;
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}
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// Let frame know that we are reflowing it
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mFrame->WillReflow(mPresContext);
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#ifdef DEBUG
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mMetrics.width = nscoord(0xdeadbeef);
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mMetrics.height = nscoord(0xdeadbeef);
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#endif
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mOuterReflowState.mFloatManager->Translate(tx, ty);
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rv = mFrame->Reflow(mPresContext, mMetrics, aFrameRS, aFrameReflowStatus);
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mOuterReflowState.mFloatManager->Translate(-tx, -ty);
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#ifdef DEBUG
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if (!NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus)) {
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if (CRAZY_WIDTH(mMetrics.width) || CRAZY_HEIGHT(mMetrics.height)) {
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printf("nsBlockReflowContext: ");
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nsFrame::ListTag(stdout, mFrame);
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printf(" metrics=%d,%d!\n", mMetrics.width, mMetrics.height);
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}
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if ((mMetrics.width == nscoord(0xdeadbeef)) ||
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(mMetrics.height == nscoord(0xdeadbeef))) {
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printf("nsBlockReflowContext: ");
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nsFrame::ListTag(stdout, mFrame);
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printf(" didn't set w/h %d,%d!\n", mMetrics.width, mMetrics.height);
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}
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}
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#endif
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if (!mFrame->HasOverflowAreas()) {
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mMetrics.SetOverflowAreasToDesiredBounds();
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}
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if (!NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus) ||
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(mFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
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// If frame is complete and has a next-in-flow, we need to delete
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// them now. Do not do this when a break-before is signaled because
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// the frame is going to get reflowed again (and may end up wanting
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// a next-in-flow where it ends up), unless it is an out of flow frame.
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if (NS_FRAME_IS_FULLY_COMPLETE(aFrameReflowStatus)) {
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nsIFrame* kidNextInFlow = mFrame->GetNextInFlow();
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if (nullptr != kidNextInFlow) {
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// Remove all of the childs next-in-flows. Make sure that we ask
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// the right parent to do the removal (it's possible that the
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// parent is not this because we are executing pullup code).
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// Floats will eventually be removed via nsBlockFrame::RemoveFloat
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// which detaches the placeholder from the float.
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/* XXX promote DeleteChildsNextInFlow to nsIFrame to elminate this cast */
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aState.mOverflowTracker->Finish(mFrame);
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static_cast<nsContainerFrame*>(kidNextInFlow->GetParent())
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->DeleteNextInFlowChild(mPresContext, kidNextInFlow, true);
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}
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}
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}
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return rv;
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}
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/**
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* Attempt to place the block frame within the available space. If
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* it fits, apply horizontal positioning (CSS 10.3.3), collapse
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* margins (CSS2 8.3.1). Also apply relative positioning.
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*/
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bool
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nsBlockReflowContext::PlaceBlock(const nsHTMLReflowState& aReflowState,
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bool aForceFit,
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nsLineBox* aLine,
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nsCollapsingMargin& aBottomMarginResult,
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nsRect& aInFlowBounds,
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nsOverflowAreas& aOverflowAreas,
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nsReflowStatus aReflowStatus)
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{
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// Compute collapsed bottom margin value.
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if (NS_FRAME_IS_COMPLETE(aReflowStatus)) {
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aBottomMarginResult = mMetrics.mCarriedOutBottomMargin;
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aBottomMarginResult.Include(aReflowState.mComputedMargin.bottom);
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} else {
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// The used bottom-margin is set to zero above a break.
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aBottomMarginResult.Zero();
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}
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nscoord x = mX;
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nscoord y = mY;
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nscoord backupContainingBlockAdvance = 0;
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// Check whether the block's bottom margin collapses with its top
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// margin. See CSS 2.1 section 8.3.1; those rules seem to match
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// nsBlockFrame::IsEmpty(). Any such block must have zero height so
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// check that first. Note that a block can have clearance and still
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// have adjoining top/bottom margins, because the clearance goes
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// above the top margin.
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// Mark the frame as non-dirty; it has been reflowed (or we wouldn't
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// be here), and we don't want to assert in CachedIsEmpty()
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mFrame->RemoveStateBits(NS_FRAME_IS_DIRTY);
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bool empty = 0 == mMetrics.height && aLine->CachedIsEmpty();
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if (empty) {
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// Collapse the bottom margin with the top margin that was already
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// applied.
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aBottomMarginResult.Include(mTopMargin);
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#ifdef NOISY_VERTICAL_MARGINS
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printf(" ");
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nsFrame::ListTag(stdout, mOuterReflowState.frame);
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printf(": ");
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nsFrame::ListTag(stdout, mFrame);
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printf(" -- collapsing top & bottom margin together; y=%d spaceY=%d\n",
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y, mSpace.y);
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#endif
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// Section 8.3.1 of CSS 2.1 says that blocks with adjoining
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// top/bottom margins whose top margin collapses with their
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// parent's top margin should have their top border-edge at the
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// top border-edge of their parent. We actually don't have to do
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// anything special to make this happen. In that situation,
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// nsBlockFrame::ShouldApplyTopMargin will have returned false,
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// and mTopMargin and aClearance will have been zero in
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// ReflowBlock.
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// If we did apply our top margin, but now we're collapsing it
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// into the bottom margin, we need to back up the containing
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// block's y-advance by our top margin so that it doesn't get
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// counted twice. Note that here we're allowing the line's bounds
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// to become different from the block's position; we do this
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// because the containing block will place the next line at the
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// line's YMost, and it must place the next line at a different
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// point from where this empty block will be.
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backupContainingBlockAdvance = mTopMargin.get();
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}
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// See if the frame fit. If it's the first frame or empty then it
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// always fits. If the height is unconstrained then it always fits,
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// even if there's some sort of integer overflow that makes y +
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// mMetrics.height appear to go beyond the available height.
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if (!empty && !aForceFit && mSpace.height != NS_UNCONSTRAINEDSIZE) {
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nscoord yMost = y - backupContainingBlockAdvance + mMetrics.height;
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if (yMost > mSpace.YMost()) {
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// didn't fit, we must acquit.
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mFrame->DidReflow(mPresContext, &aReflowState, NS_FRAME_REFLOW_FINISHED);
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return false;
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}
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}
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aInFlowBounds = nsRect(x, y - backupContainingBlockAdvance,
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mMetrics.width, mMetrics.height);
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// Apply CSS relative positioning
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const nsStyleDisplay* styleDisp = mFrame->GetStyleDisplay();
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if (NS_STYLE_POSITION_RELATIVE == styleDisp->mPosition) {
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x += aReflowState.mComputedOffsets.left;
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y += aReflowState.mComputedOffsets.top;
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}
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// Now place the frame and complete the reflow process
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nsContainerFrame::FinishReflowChild(mFrame, mPresContext, &aReflowState, mMetrics, x, y, 0);
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aOverflowAreas = mMetrics.mOverflowAreas + nsPoint(x, y);
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return true;
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}
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