зеркало из https://github.com/mozilla/gecko-dev.git
496 строки
20 KiB
C++
496 строки
20 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org 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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*
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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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/*
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* code for managing absolutely positioned children of a rendering
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* object that is a containing block for them
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*/
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#include "nsCOMPtr.h"
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#include "nsAbsoluteContainingBlock.h"
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#include "nsContainerFrame.h"
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#include "nsIPresShell.h"
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#include "nsHTMLParts.h"
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#include "nsPresContext.h"
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#ifdef DEBUG
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#include "nsBlockFrame.h"
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#endif
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nsresult
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nsAbsoluteContainingBlock::FirstChild(const nsIFrame* aDelegatingFrame,
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nsIAtom* aListName,
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nsIFrame** aFirstChild) const
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{
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NS_PRECONDITION(GetChildListName() == aListName, "unexpected child list name");
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*aFirstChild = mAbsoluteFrames.FirstChild();
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return NS_OK;
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}
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nsresult
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nsAbsoluteContainingBlock::SetInitialChildList(nsIFrame* aDelegatingFrame,
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nsIAtom* aListName,
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nsIFrame* aChildList)
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{
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NS_PRECONDITION(GetChildListName() == aListName, "unexpected child list name");
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#ifdef NS_DEBUG
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nsFrame::VerifyDirtyBitSet(aChildList);
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#endif
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mAbsoluteFrames.SetFrames(aChildList);
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return NS_OK;
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}
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nsresult
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nsAbsoluteContainingBlock::AppendFrames(nsIFrame* aDelegatingFrame,
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nsIAtom* aListName,
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nsIFrame* aFrameList)
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{
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NS_ASSERTION(GetChildListName() == aListName, "unexpected child list");
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// Append the frames to our list of absolutely positioned frames
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#ifdef NS_DEBUG
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nsFrame::VerifyDirtyBitSet(aFrameList);
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#endif
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mAbsoluteFrames.AppendFrames(nsnull, aFrameList);
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aDelegatingFrame->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
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// no damage to intrinsic widths, since absolutely positioned frames can't
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// change them
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return aDelegatingFrame->PresContext()->PresShell()->
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FrameNeedsReflow(aDelegatingFrame, nsIPresShell::eResize);
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}
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nsresult
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nsAbsoluteContainingBlock::InsertFrames(nsIFrame* aDelegatingFrame,
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nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsIFrame* aFrameList)
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{
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NS_ASSERTION(GetChildListName() == aListName, "unexpected child list");
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NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == aDelegatingFrame,
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"inserting after sibling frame with different parent");
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#ifdef NS_DEBUG
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nsFrame::VerifyDirtyBitSet(aFrameList);
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#endif
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mAbsoluteFrames.InsertFrames(nsnull, aPrevFrame, aFrameList);
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aDelegatingFrame->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
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// no damage to intrinsic widths, since absolutely positioned frames can't
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// change them
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return aDelegatingFrame->PresContext()->PresShell()->
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FrameNeedsReflow(aDelegatingFrame, nsIPresShell::eResize);
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}
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nsresult
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nsAbsoluteContainingBlock::RemoveFrame(nsIFrame* aDelegatingFrame,
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nsIAtom* aListName,
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nsIFrame* aOldFrame)
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{
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NS_ASSERTION(GetChildListName() == aListName, "unexpected child list");
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PRBool result = mAbsoluteFrames.DestroyFrame(aOldFrame);
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NS_ASSERTION(result, "didn't find frame to delete");
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// Because positioned frames aren't part of a flow, there's no additional
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// work to do, e.g. reflowing sibling frames. And because positioned frames
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// have a view, we don't need to repaint
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return result ? NS_OK : NS_ERROR_FAILURE;
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}
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static void
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AddFrameToChildBounds(nsIFrame* aKidFrame, nsRect* aChildBounds)
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{
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NS_PRECONDITION(aKidFrame, "Must have kid frame");
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if (!aChildBounds) {
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return;
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}
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// Add in the child's bounds
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nsRect kidBounds = aKidFrame->GetRect();
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nsRect* kidOverflow = aKidFrame->GetOverflowAreaProperty();
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if (kidOverflow) {
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// Put it in the parent's coordinate system
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kidBounds = *kidOverflow + kidBounds.TopLeft();
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}
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aChildBounds->UnionRect(*aChildBounds, kidBounds);
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}
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nsresult
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nsAbsoluteContainingBlock::Reflow(nsIFrame* aDelegatingFrame,
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nsPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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PRBool aCBWidthChanged,
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PRBool aCBHeightChanged,
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nsRect* aChildBounds)
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{
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// Initialize OUT parameter
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if (aChildBounds)
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aChildBounds->SetRect(0, 0, 0, 0);
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PRBool reflowAll = aReflowState.ShouldReflowAllKids();
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nsIFrame* kidFrame;
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for (kidFrame = mAbsoluteFrames.FirstChild(); kidFrame; kidFrame = kidFrame->GetNextSibling()) {
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if (reflowAll ||
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(kidFrame->GetStateBits() &
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(NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN)) ||
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FrameDependsOnContainer(kidFrame, aCBWidthChanged, aCBHeightChanged)) {
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// Reflow the frame
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nsReflowStatus kidStatus;
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ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, aReflowState, aContainingBlockWidth,
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aContainingBlockHeight, kidFrame, kidStatus);
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}
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AddFrameToChildBounds(kidFrame, aChildBounds);
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}
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return NS_OK;
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}
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static PRBool IsFixedPaddingSize(nsStyleUnit aUnit) {
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return aUnit == eStyleUnit_Coord || aUnit == eStyleUnit_Null;
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}
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static PRBool IsFixedMarginSize(nsStyleUnit aUnit) {
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return aUnit == eStyleUnit_Coord || aUnit == eStyleUnit_Null;
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}
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static PRBool IsFixedMaxSize(nsStyleUnit aUnit) {
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return aUnit == eStyleUnit_Null || aUnit == eStyleUnit_Coord;
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}
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PRBool
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nsAbsoluteContainingBlock::FrameDependsOnContainer(nsIFrame* f,
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PRBool aCBWidthChanged,
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PRBool aCBHeightChanged)
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{
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const nsStylePosition* pos = f->GetStylePosition();
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// See if f's position might have changed because it depends on a
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// placeholder's position
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// This can happen in the following cases:
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// 1) Vertical positioning. "top" must be auto and "bottom" must be auto
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// (otherwise the vertical position is completely determined by
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// whichever of them is not auto and the height).
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// 2) Horizontal positioning. "left" must be auto and "right" must be auto
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// (otherwise the horizontal position is completely determined by
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// whichever of them is not auto and the width).
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// See nsHTMLReflowState::InitAbsoluteConstraints -- these are the
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// only cases when we call CalculateHypotheticalBox().
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if ((pos->mOffset.GetTopUnit() == eStyleUnit_Auto &&
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pos->mOffset.GetBottomUnit() == eStyleUnit_Auto) ||
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(pos->mOffset.GetLeftUnit() == eStyleUnit_Auto &&
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pos->mOffset.GetRightUnit() == eStyleUnit_Auto)) {
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return PR_TRUE;
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}
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if (!aCBWidthChanged && !aCBHeightChanged) {
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// skip getting style data
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return PR_FALSE;
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}
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const nsStylePadding* padding = f->GetStylePadding();
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const nsStyleMargin* margin = f->GetStyleMargin();
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if (aCBWidthChanged) {
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// See if f's width might have changed.
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// If border-left, border-right, padding-left, padding-right,
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// width, min-width, and max-width are all lengths, 'none', or enumerated,
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// then our frame width does not depend on the parent width.
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// Note that borders never depend on the parent width
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if (pos->mWidth.GetUnit() != eStyleUnit_Coord ||
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pos->mMinWidth.GetUnit() != eStyleUnit_Coord ||
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!IsFixedMaxSize(pos->mMaxWidth.GetUnit()) ||
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!IsFixedPaddingSize(padding->mPadding.GetLeftUnit()) ||
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!IsFixedPaddingSize(padding->mPadding.GetRightUnit())) {
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return PR_TRUE;
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}
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// See if f's position might have changed. If we're RTL then the
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// rules are slightly different. We'll assume percentage or auto
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// margins will always induce a dependency on the size
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if (!IsFixedMarginSize(margin->mMargin.GetLeftUnit()) ||
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!IsFixedMarginSize(margin->mMargin.GetRightUnit())) {
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return PR_TRUE;
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}
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if (f->GetStyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
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// Note that even if 'left' is a length, our position can
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// still depend on the containing block width, because if
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// 'right' is also a length we will discard 'left' and be
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// positioned relative to the containing block right edge.
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// 'left' length and 'right' auto is the only combination
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// we can be sure of.
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if (pos->mOffset.GetLeftUnit() != eStyleUnit_Coord ||
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pos->mOffset.GetRightUnit() != eStyleUnit_Auto) {
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return PR_TRUE;
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}
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} else {
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if (pos->mOffset.GetLeftUnit() != eStyleUnit_Coord) {
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return PR_TRUE;
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}
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}
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}
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if (aCBHeightChanged) {
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// See if f's height might have changed.
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// If border-top, border-bottom, padding-top, padding-bottom,
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// min-height, and max-height are all lengths or 'none',
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// and height is a length or height and bottom are auto and top is not auto,
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// then our frame height does not depend on the parent height.
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// Note that borders never depend on the parent height
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if (!(pos->mHeight.GetUnit() == eStyleUnit_Coord ||
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(pos->mHeight.GetUnit() == eStyleUnit_Auto &&
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pos->mOffset.GetBottomUnit() == eStyleUnit_Auto &&
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pos->mOffset.GetTopUnit() != eStyleUnit_Auto)) ||
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pos->mMinHeight.GetUnit() != eStyleUnit_Coord ||
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!IsFixedMaxSize(pos->mMaxHeight.GetUnit()) ||
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!IsFixedPaddingSize(padding->mPadding.GetTopUnit()) ||
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!IsFixedPaddingSize(padding->mPadding.GetBottomUnit())) {
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return PR_TRUE;
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}
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// See if f's position might have changed.
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if (!IsFixedMarginSize(margin->mMargin.GetTopUnit()) ||
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!IsFixedMarginSize(margin->mMargin.GetBottomUnit())) {
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return PR_TRUE;
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}
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if (pos->mOffset.GetTopUnit() != eStyleUnit_Coord) {
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return PR_TRUE;
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}
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}
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return PR_FALSE;
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}
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void
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nsAbsoluteContainingBlock::DestroyFrames(nsIFrame* aDelegatingFrame)
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{
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mAbsoluteFrames.DestroyFrames();
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}
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// XXX Optimize the case where it's a resize reflow and the absolutely
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// positioned child has the exact same size and position and skip the
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// reflow...
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// When bug 154892 is checked in, make sure that when
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// GetChildListName() == nsGkAtoms::fixedList, the height is unconstrained.
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// since we don't allow replicated frames to split.
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nsresult
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nsAbsoluteContainingBlock::ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame,
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nsPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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nsIFrame* aKidFrame,
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nsReflowStatus& aStatus)
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{
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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("abs pos ");
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if (nsnull != aKidFrame) {
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nsIFrameDebug* frameDebug;
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if (NS_SUCCEEDED(CallQueryInterface(aKidFrame, &frameDebug))) {
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nsAutoString name;
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frameDebug->GetFrameName(name);
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printf("%s ", NS_LossyConvertUTF16toASCII(name).get());
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}
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}
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char width[16];
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char height[16];
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PrettyUC(aReflowState.availableWidth, width);
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PrettyUC(aReflowState.availableHeight, height);
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printf(" a=%s,%s ", width, height);
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PrettyUC(aReflowState.ComputedWidth(), width);
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PrettyUC(aReflowState.mComputedHeight, height);
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printf("c=%s,%s \n", width, height);
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}
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AutoNoisyIndenter indent(nsBlockFrame::gNoisy);
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#endif // DEBUG
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// Store position and overflow rect so taht we can invalidate the correct
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// area if the position changes
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nsRect oldOverflowRect(aKidFrame->GetOverflowRect() +
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aKidFrame->GetPosition());
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nsRect oldRect = aKidFrame->GetRect();
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nsresult rv;
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// Get the border values
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const nsMargin& border = aReflowState.mStyleBorder->GetBorder();
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nscoord availWidth = aContainingBlockWidth;
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if (availWidth == -1) {
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NS_ASSERTION(aReflowState.ComputedWidth() != NS_UNCONSTRAINEDSIZE,
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"Must have a useful width _somewhere_");
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availWidth =
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aReflowState.ComputedWidth() + aReflowState.mComputedPadding.LeftRight();
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}
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nsHTMLReflowMetrics kidDesiredSize;
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nsHTMLReflowState kidReflowState(aPresContext, aReflowState, aKidFrame,
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nsSize(availWidth, NS_UNCONSTRAINEDSIZE),
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aContainingBlockWidth,
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aContainingBlockHeight);
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// Send the WillReflow() notification and position the frame
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aKidFrame->WillReflow(aPresContext);
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// XXXldb We can simplify this if we come up with a better way to
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// position views.
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nscoord x;
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if (NS_AUTOOFFSET == kidReflowState.mComputedOffsets.left) {
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// Just use the current x-offset
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x = aKidFrame->GetPosition().x;
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} else {
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x = border.left + kidReflowState.mComputedOffsets.left + kidReflowState.mComputedMargin.left;
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}
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aKidFrame->SetPosition(nsPoint(x, border.top +
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kidReflowState.mComputedOffsets.top +
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kidReflowState.mComputedMargin.top));
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// Do the reflow
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rv = aKidFrame->Reflow(aPresContext, kidDesiredSize, kidReflowState, aStatus);
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// If we're solving for 'left' or 'top', then compute it now that we know the
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// width/height
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if ((NS_AUTOOFFSET == kidReflowState.mComputedOffsets.left) ||
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(NS_AUTOOFFSET == kidReflowState.mComputedOffsets.top)) {
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if (-1 == aContainingBlockWidth) {
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// Get the containing block width/height
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kidReflowState.ComputeContainingBlockRectangle(aPresContext,
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&aReflowState,
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aContainingBlockWidth,
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aContainingBlockHeight);
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}
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if (NS_AUTOOFFSET == kidReflowState.mComputedOffsets.left) {
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NS_ASSERTION(NS_AUTOOFFSET != kidReflowState.mComputedOffsets.right,
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"Can't solve for both left and right");
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kidReflowState.mComputedOffsets.left = aContainingBlockWidth -
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kidReflowState.mComputedOffsets.right -
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kidReflowState.mComputedMargin.right -
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kidDesiredSize.width -
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kidReflowState.mComputedMargin.left;
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}
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if (NS_AUTOOFFSET == kidReflowState.mComputedOffsets.top) {
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kidReflowState.mComputedOffsets.top = aContainingBlockHeight -
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kidReflowState.mComputedOffsets.bottom -
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kidReflowState.mComputedMargin.bottom -
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kidDesiredSize.height -
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kidReflowState.mComputedMargin.top;
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}
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}
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// Position the child relative to our padding edge
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nsRect rect(border.left + kidReflowState.mComputedOffsets.left + kidReflowState.mComputedMargin.left,
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border.top + kidReflowState.mComputedOffsets.top + kidReflowState.mComputedMargin.top,
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kidDesiredSize.width, kidDesiredSize.height);
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aKidFrame->SetRect(rect);
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nsIView* view = aKidFrame->GetView();
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if (view) {
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// Size and position the view and set its opacity, visibility, content
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// transparency, and clip
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nsContainerFrame::SyncFrameViewAfterReflow(aPresContext, aKidFrame,
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view,
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&kidDesiredSize.mOverflowArea);
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} else {
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nsContainerFrame::PositionChildViews(aKidFrame);
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}
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if (oldRect.TopLeft() != rect.TopLeft() ||
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(aDelegatingFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW) ||
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((aKidFrame->GetStyleDisplay()->mClipFlags & NS_STYLE_CLIP_RECT) &&
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(kidDesiredSize.mOverflowArea != oldOverflowRect))) {
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// The frame moved; we have to invalidate the whole frame
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// because the children may have moved after they were reflowed
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// We also have to invalidate when we're clipping and the overflow
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// changes; the style code doesn't know how to deal with this case
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// XXX This could be optimized in some cases, especially clipping changes
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aKidFrame->GetParent()->Invalidate(oldOverflowRect);
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aKidFrame->GetParent()->Invalidate(kidDesiredSize.mOverflowArea +
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rect.TopLeft());
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} else if (oldRect.Size() != rect.Size()) {
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// Invalidate the area where the frame changed size.
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nscoord innerWidth = PR_MIN(oldRect.width, rect.width);
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nscoord innerHeight = PR_MIN(oldRect.height, rect.height);
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nscoord outerWidth = PR_MAX(oldRect.width, rect.width);
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nscoord outerHeight = PR_MAX(oldRect.height, rect.height);
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aKidFrame->GetParent()->Invalidate(
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nsRect(rect.x + innerWidth, rect.y, outerWidth - innerWidth, outerHeight));
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// Invalidate the horizontal strip
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aKidFrame->GetParent()->Invalidate(
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nsRect(rect.x, rect.y + innerHeight, outerWidth, outerHeight - innerHeight));
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}
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aKidFrame->DidReflow(aPresContext, &kidReflowState, NS_FRAME_REFLOW_FINISHED);
|
|
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsFrame::IndentBy(stdout,nsBlockFrame::gNoiseIndent - 1);
|
|
printf("abs pos ");
|
|
if (nsnull != aKidFrame) {
|
|
nsIFrameDebug* frameDebug;
|
|
if (NS_SUCCEEDED(CallQueryInterface(aKidFrame, &frameDebug))) {
|
|
nsAutoString name;
|
|
frameDebug->GetFrameName(name);
|
|
printf("%s ", NS_LossyConvertUTF16toASCII(name).get());
|
|
}
|
|
}
|
|
printf("%p rect=%d,%d,%d,%d", aKidFrame, rect.x, rect.y, rect.width, rect.height);
|
|
printf("\n");
|
|
}
|
|
#endif
|
|
|
|
return rv;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
void nsAbsoluteContainingBlock::PrettyUC(nscoord aSize,
|
|
char* aBuf)
|
|
{
|
|
if (NS_UNCONSTRAINEDSIZE == aSize) {
|
|
strcpy(aBuf, "UC");
|
|
}
|
|
else {
|
|
if((PRInt32)0xdeadbeef == aSize)
|
|
{
|
|
strcpy(aBuf, "deadbeef");
|
|
}
|
|
else {
|
|
sprintf(aBuf, "%d", aSize);
|
|
}
|
|
}
|
|
}
|
|
#endif
|