1145 строки
41 KiB
C++
1145 строки
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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*
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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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#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 "nsLayoutAtoms.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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#include "nsHTMLAtoms.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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: mBlock(aFrame),
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mPresContext(aPresContext),
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mReflowState(aReflowState),
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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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const nsMargin& borderPadding = BorderPadding();
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if (aReflowState.availableHeight != NS_UNCONSTRAINEDSIZE) {
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mBlock->SetProperty(nsLayoutAtoms::overflowPlaceholdersProperty,
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&mOverflowPlaceholders, nsnull);
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mBlock->AddStateBits(NS_BLOCK_HAS_OVERFLOW_PLACEHOLDERS);
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}
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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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mSpaceManager = aReflowState.mSpaceManager;
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NS_ASSERTION(mSpaceManager,
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"SpaceManager should be set in nsBlockReflowState" );
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if (mSpaceManager) {
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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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mSpaceManager->Translate(borderPadding.left, borderPadding.top);
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mSpaceManager->GetTranslation(mSpaceManagerX, mSpaceManagerY);
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}
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mReflowStatus = NS_FRAME_COMPLETE;
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mPresContext = aPresContext;
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mNextInFlow = NS_STATIC_CAST(nsBlockFrame*, mBlock->GetNextInFlow());
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mKidXMost = 0;
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// Compute content area width (the content area is inside the border
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// and padding)
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if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedWidth) {
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mContentArea.width = aReflowState.mComputedWidth;
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}
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else {
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if (NS_UNCONSTRAINEDSIZE == aReflowState.availableWidth) {
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mContentArea.width = NS_UNCONSTRAINEDSIZE;
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SetFlag(BRS_UNCONSTRAINEDWIDTH, PR_TRUE);
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}
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else if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMaxWidth) {
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// Choose a width based on the content (shrink wrap width) up
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// to the maximum width
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mContentArea.width = aReflowState.mComputedMaxWidth;
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SetFlag(BRS_SHRINKWRAPWIDTH, PR_TRUE);
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}
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else {
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nscoord lr = borderPadding.left + borderPadding.right;
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mContentArea.width = PR_MAX(0, aReflowState.availableWidth - lr);
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}
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}
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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 = PR_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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mBand.Init(mSpaceManager, mContentArea);
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mPrevChild = nsnull;
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mCurrentLine = aFrame->end_lines();
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SetFlag(BRS_COMPUTEMAXELEMENTWIDTH, aMetrics.mComputeMEW);
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#ifdef DEBUG
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if (nsBlockFrame::gNoisyMaxElementWidth) {
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nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
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printf("BRS: setting compute-MEW to %d\n", aMetrics.mComputeMEW);
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}
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#endif
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mMaxElementWidth = 0;
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SetFlag(BRS_COMPUTEMAXWIDTH,
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(NS_REFLOW_CALC_MAX_WIDTH == (aMetrics.mFlags & NS_REFLOW_CALC_MAX_WIDTH)));
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mMaximumWidth = 0;
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mMinLineHeight = nsHTMLReflowState::CalcLineHeight(mPresContext,
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aReflowState.rendContext,
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aReflowState.frame);
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}
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nsBlockReflowState::~nsBlockReflowState()
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{
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// Restore the coordinate system, unless the space manager is null,
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// which means it was just destroyed.
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if (mSpaceManager) {
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const nsMargin& borderPadding = BorderPadding();
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mSpaceManager->Translate(-borderPadding.left, -borderPadding.top);
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}
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if (mReflowState.availableHeight != NS_UNCONSTRAINEDSIZE) {
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mBlock->UnsetProperty(nsLayoutAtoms::overflowPlaceholdersProperty);
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mBlock->RemoveStateBits(NS_BLOCK_HAS_OVERFLOW_PLACEHOLDERS);
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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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// 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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nsSplittableType aSplitType,
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const nsStyleDisplay* aDisplay,
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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 float count %d\n", aFrame, mBand.GetFloatCount());
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mBand.List();
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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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: mBottomEdge - mY;
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const nsMargin& borderPadding = BorderPadding();
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/* bug 18445: treat elements mapped to display: block such as text controls
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* just like normal blocks */
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// text controls are not splittable, so make a special case here
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// XXXldb Why not just set the frame state bit?
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PRBool treatAsNotSplittable =
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nsLayoutAtoms::textInputFrame == aFrame->GetType();
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if (NS_FRAME_SPLITTABLE_NON_RECTANGULAR == aSplitType || // normal blocks
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NS_FRAME_NOT_SPLITTABLE == aSplitType || // things like images mapped to display: block
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PR_TRUE == treatAsNotSplittable) // text input controls mapped to display: block (special case)
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{
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if (mBand.GetFloatCount()) {
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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 = GetFlag(BRS_UNCONSTRAINEDWIDTH)
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? NS_UNCONSTRAINEDSIZE
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: mContentArea.width;
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break;
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case NS_STYLE_FLOAT_EDGE_BORDER:
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case NS_STYLE_FLOAT_EDGE_PADDING:
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{
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// The child block's border should be placed adjacent to,
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// but not overlap the float(s).
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nsMargin m(0, 0, 0, 0);
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const nsStyleMargin* styleMargin = aFrame->GetStyleMargin();
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styleMargin->GetMargin(m); // XXX percentage margins
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if (NS_STYLE_FLOAT_EDGE_PADDING == borderStyle->mFloatEdge) {
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// Add in border too
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nsMargin b;
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borderStyle->GetBorder(b);
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m += b;
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}
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// determine left edge
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if (mBand.GetLeftFloatCount()) {
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aResult.x = mAvailSpaceRect.x + borderPadding.left - m.left;
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}
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else {
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aResult.x = borderPadding.left;
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}
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// determine width
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if (GetFlag(BRS_UNCONSTRAINEDWIDTH)) {
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aResult.width = NS_UNCONSTRAINEDSIZE;
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}
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else {
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if (mBand.GetRightFloatCount()) {
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if (mBand.GetLeftFloatCount()) {
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aResult.width = mAvailSpaceRect.width + m.left + m.right;
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}
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else {
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aResult.width = mAvailSpaceRect.width + m.right;
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}
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}
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else {
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aResult.width = mAvailSpaceRect.width + m.left;
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}
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}
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}
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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 = mAvailSpaceRect.x + borderPadding.left;
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aResult.width = mAvailSpaceRect.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 = GetFlag(BRS_UNCONSTRAINEDWIDTH)
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? NS_UNCONSTRAINEDSIZE
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: mContentArea.width;
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}
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}
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else {
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// The frame is clueless about the space 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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aResult.x = mAvailSpaceRect.x + borderPadding.left;
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aResult.width = mAvailSpaceRect.width;
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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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void
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nsBlockReflowState::GetAvailableSpace(nscoord aY)
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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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mSpaceManager->GetTranslation(wx, wy);
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NS_ASSERTION((wx == mSpaceManagerX) && (wy == mSpaceManagerY),
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"bad coord system");
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#endif
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mBand.GetAvailableSpace(aY - BorderPadding().top, mAvailSpaceRect);
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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 count=%d\n",
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mAvailSpaceRect.x, mAvailSpaceRect.y,
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mAvailSpaceRect.width, mAvailSpaceRect.height,
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mBand.GetTrapezoidCount());
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}
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#endif
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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 ((0 == mReflowState.mComputedBorderPadding.top) &&
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!(block->mState & NS_BLOCK_MARGIN_ROOT)) {
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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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* Restore information about floats into the space 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
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* incremental reflow O(N^2) and this state should really be kept
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* 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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{
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if (aLine->HasFloats()) {
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// Place the floats into the space-manager again. Also slide
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// 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->mPlaceholder->GetOutOfFlowFrame();
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if (aDeltaY != 0) {
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fc->mRegion.y += aDeltaY;
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fc->mCombinedArea.y += aDeltaY;
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nsPoint p = floatFrame->GetPosition();
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floatFrame->SetPosition(nsPoint(p.x, p.y + aDeltaY));
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}
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#ifdef DEBUG
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if (nsBlockFrame::gNoisyReflow || nsBlockFrame::gNoisySpaceManager) {
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nscoord tx, ty;
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mSpaceManager->GetTranslation(tx, ty);
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nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
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printf("RecoverFloats: txy=%d,%d (%d,%d) ",
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tx, ty, mSpaceManagerX, mSpaceManagerY);
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nsFrame::ListTag(stdout, floatFrame);
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printf(" aDeltaY=%d region={%d,%d,%d,%d}\n",
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aDeltaY, fc->mRegion.x, fc->mRegion.y,
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fc->mRegion.width, fc->mRegion.height);
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}
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#endif
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mSpaceManager->AddRectRegion(floatFrame, fc->mRegion);
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fc = fc->Next();
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}
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} else if (aLine->IsBlock()) {
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nsBlockFrame *kid = nsnull;
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aLine->mFirstChild->QueryInterface(kBlockFrameCID, (void**)&kid);
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// don't recover any state inside a block that has its own space
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// manager (we don't currently have any blocks like this, though,
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// thanks to our use of extra frames for 'overflow')
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if (kid && !(kid->GetStateBits() & NS_BLOCK_SPACE_MGR)) {
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nscoord tx = kid->mRect.x, ty = kid->mRect.y;
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// If the element is relatively positioned, then adjust x and y
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// accordingly so that we consider relatively positioned frames
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// at their original position.
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if (NS_STYLE_POSITION_RELATIVE == kid->GetStyleDisplay()->mPosition) {
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nsPoint *offsets = NS_STATIC_CAST(nsPoint*,
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mPresContext->PropertyTable()->GetProperty(kid,
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nsLayoutAtoms::computedOffsetProperty));
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if (offsets) {
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tx -= offsets->x;
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ty -= offsets->y;
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}
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}
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mSpaceManager->Translate(tx, ty);
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for (nsBlockFrame::line_iterator line = kid->begin_lines(),
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line_end = kid->end_lines();
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line != line_end;
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++line)
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// Pass 0, not the real DeltaY, since these floats aren't
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// moving relative to their parent block, only relative to
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// the space manager.
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RecoverFloats(line, 0);
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mSpaceManager->Translate(-tx, -ty);
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}
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}
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}
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/**
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* Everything done in this function is done O(N) times for each pass of
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* reflow so it is O(N*M) where M is the number of incremental reflow
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* passes. That's bad. Don't do stuff here.
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*
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* 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;
|
|
|
|
// Recover mKidXMost and mMaxElementWidth
|
|
nscoord xmost = aLine->mBounds.XMost();
|
|
if (xmost > mKidXMost) {
|
|
#ifdef DEBUG
|
|
if (CRAZY_WIDTH(xmost)) {
|
|
nsFrame::ListTag(stdout, mBlock);
|
|
printf(": WARNING: xmost:%d\n", xmost);
|
|
}
|
|
#endif
|
|
#ifdef NOISY_KIDXMOST
|
|
printf("%p RecoverState block %p aState.mKidXMost=%d\n", this, mBlock, xmost);
|
|
#endif
|
|
mKidXMost = xmost;
|
|
}
|
|
if (GetFlag(BRS_COMPUTEMAXELEMENTWIDTH)) {
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyMaxElementWidth) {
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("nsBlockReflowState::RecoverStateFrom block %p caching max width %d\n", mBlock, aLine->mMaxElementWidth);
|
|
}
|
|
#endif
|
|
UpdateMaxElementWidth(aLine->mMaxElementWidth);
|
|
|
|
// Recover the float MEWs for floats in this line (but not in
|
|
// blocks within it, since their MEWs are already part of the block's
|
|
// MEW).
|
|
if (aLine->HasFloats()) {
|
|
for (nsFloatCache* fc = aLine->GetFirstFloat(); fc; fc = fc->Next())
|
|
UpdateMaxElementWidth(fc->mMaxElementWidth);
|
|
}
|
|
}
|
|
|
|
// If computing the maximum width, then update mMaximumWidth
|
|
if (GetFlag(BRS_COMPUTEMAXWIDTH)) {
|
|
#ifdef NOISY_MAXIMUM_WIDTH
|
|
printf("nsBlockReflowState::RecoverStateFrom block %p caching max width %d\n", mBlock, aLine->mMaximumWidth);
|
|
#endif
|
|
UpdateMaximumWidth(aLine->mMaximumWidth);
|
|
}
|
|
|
|
// Place floats for this line into the space 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();
|
|
mSpaceManager->Translate(-bp.left, -bp.top);
|
|
|
|
RecoverFloats(aLine, aDeltaY);
|
|
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow || nsBlockFrame::gNoisySpaceManager) {
|
|
mSpaceManager->List(stdout);
|
|
}
|
|
#endif
|
|
// And then put the translation back again
|
|
mSpaceManager->Translate(bp.left, bp.top);
|
|
}
|
|
}
|
|
|
|
PRBool
|
|
nsBlockReflowState::IsImpactedByFloat() const
|
|
{
|
|
#ifdef REALLY_NOISY_REFLOW
|
|
printf("nsBlockReflowState::IsImpactedByFloat %p returned %d\n",
|
|
this, mBand.GetFloatCount());
|
|
#endif
|
|
return mBand.GetFloatCount() > 0;
|
|
}
|
|
|
|
|
|
PRBool
|
|
nsBlockReflowState::InitFloat(nsLineLayout& aLineLayout,
|
|
nsPlaceholderFrame* aPlaceholder,
|
|
nsReflowStatus& aReflowStatus)
|
|
{
|
|
// Set the geometric parent of the float
|
|
nsIFrame* floatFrame = aPlaceholder->GetOutOfFlowFrame();
|
|
floatFrame->SetParent(mBlock);
|
|
|
|
// Then add the float to the current line and place it when
|
|
// appropriate
|
|
return AddFloat(aLineLayout, aPlaceholder, PR_TRUE, aReflowStatus);
|
|
}
|
|
|
|
// 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,
|
|
nsPlaceholderFrame* aPlaceholder,
|
|
PRBool aInitialReflow,
|
|
nsReflowStatus& aReflowStatus)
|
|
{
|
|
NS_PRECONDITION(mBlock->end_lines() != mCurrentLine, "null ptr");
|
|
|
|
aReflowStatus = NS_FRAME_COMPLETE;
|
|
// Allocate a nsFloatCache for the float
|
|
nsFloatCache* fc = mFloatCacheFreeList.Alloc();
|
|
fc->mPlaceholder = aPlaceholder;
|
|
fc->mIsCurrentLineFloat = aLineLayout.CanPlaceFloatNow();
|
|
fc->mMaxElementWidth = 0;
|
|
|
|
PRBool placed;
|
|
|
|
// Now place the float immediately if possible. Otherwise stash it
|
|
// away in mPendingFloats and place it later.
|
|
if (fc->mIsCurrentLineFloat) {
|
|
// 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;
|
|
mSpaceManager->GetTranslation(ox, oy);
|
|
nscoord dx = ox - mSpaceManagerX;
|
|
nscoord dy = oy - mSpaceManagerY;
|
|
mSpaceManager->Translate(-dx, -dy);
|
|
|
|
// And then place it
|
|
PRBool isLeftFloat;
|
|
placed = FlowAndPlaceFloat(fc, &isLeftFloat, aReflowStatus);
|
|
if (placed) {
|
|
// Pass on updated available space to the current inline reflow engine
|
|
GetAvailableSpace();
|
|
aLineLayout.UpdateBand(mAvailSpaceRect.x + BorderPadding().left, mY,
|
|
GetFlag(BRS_UNCONSTRAINEDWIDTH) ? NS_UNCONSTRAINEDSIZE : mAvailSpaceRect.width,
|
|
mAvailSpaceRect.height,
|
|
isLeftFloat,
|
|
aPlaceholder->GetOutOfFlowFrame());
|
|
|
|
// Record this float in the current-line list
|
|
mCurrentLineFloats.Append(fc);
|
|
}
|
|
|
|
// Restore coordinate system
|
|
mSpaceManager->Translate(dx, dy);
|
|
}
|
|
else {
|
|
// This float will be placed after the line is done (it is a
|
|
// below-current-line float).
|
|
mBelowCurrentLineFloats.Append(fc);
|
|
if (mReflowState.availableHeight != NS_UNCONSTRAINEDSIZE) {
|
|
// If the float might not be complete, mark it incomplete now to
|
|
// prevent the placeholders being torn down. We will destroy any
|
|
// placeholders later if PlaceBelowCurrentLineFloats finds the
|
|
// float is complete.
|
|
aReflowStatus = NS_FRAME_NOT_COMPLETE;
|
|
}
|
|
placed = PR_TRUE;
|
|
}
|
|
return placed;
|
|
}
|
|
|
|
void
|
|
nsBlockReflowState::UpdateMaxElementWidth(nscoord aMaxElementWidth)
|
|
{
|
|
#ifdef DEBUG
|
|
nscoord oldWidth = mMaxElementWidth;
|
|
#endif
|
|
if (aMaxElementWidth > mMaxElementWidth) {
|
|
mMaxElementWidth = aMaxElementWidth;
|
|
}
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyMaxElementWidth) {
|
|
if (mMaxElementWidth != oldWidth) {
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
if (NS_UNCONSTRAINEDSIZE == mReflowState.availableWidth) {
|
|
printf("PASS1 ");
|
|
}
|
|
nsFrame::ListTag(stdout, mBlock);
|
|
printf(": old max-element-width=%d new=%d\n",
|
|
oldWidth, mMaxElementWidth);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void
|
|
nsBlockReflowState::UpdateMaximumWidth(nscoord aMaximumWidth)
|
|
{
|
|
if (aMaximumWidth > mMaximumWidth) {
|
|
#ifdef NOISY_MAXIMUM_WIDTH
|
|
printf("nsBlockReflowState::UpdateMaximumWidth block %p caching max width %d\n", mBlock, aMaximumWidth);
|
|
#endif
|
|
mMaximumWidth = aMaximumWidth;
|
|
}
|
|
}
|
|
|
|
PRBool
|
|
nsBlockReflowState::CanPlaceFloat(const nsSize& aFloatSize,
|
|
PRUint8 aFloats)
|
|
{
|
|
// If the current Y coordinate is not impacted by any floats
|
|
// then by definition the float fits.
|
|
PRBool result = PR_TRUE;
|
|
if (0 != mBand.GetFloatCount()) {
|
|
// XXX We should allow overflow by up to half a pixel here (bug 21193).
|
|
if (mAvailSpaceRect.width < aFloatSize.width) {
|
|
// The available width is too narrow (and its been impacted by a
|
|
// prior float)
|
|
result = PR_FALSE;
|
|
}
|
|
else {
|
|
// At this point we know that there is enough horizontal space for
|
|
// the float (somewhere). Lets see if there is enough vertical
|
|
// space.
|
|
if (mAvailSpaceRect.height < aFloatSize.height) {
|
|
// The available height is too short. However, its 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 its 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 = mAvailSpaceRect.x;
|
|
}
|
|
else {
|
|
xa = mAvailSpaceRect.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 < mAvailSpaceRect.x) {
|
|
xa = mAvailSpaceRect.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;
|
|
for (;;) {
|
|
// Get the available space at the new Y coordinate
|
|
if (mAvailSpaceRect.height <= 0) {
|
|
// there is no more available space. We lose.
|
|
result = PR_FALSE;
|
|
break;
|
|
}
|
|
|
|
mY += mAvailSpaceRect.height;
|
|
GetAvailableSpace();
|
|
|
|
if (0 == mBand.GetFloatCount()) {
|
|
// Winner. This band has no floats on it, therefore
|
|
// there can be no overlap.
|
|
break;
|
|
}
|
|
|
|
// Check and make sure the float won't intersect any
|
|
// floats on this band. The floats starting and ending
|
|
// coordinates must be entirely in the available space.
|
|
if ((xa < mAvailSpaceRect.x) || (xb > mAvailSpaceRect.XMost())) {
|
|
// The float can't go here.
|
|
result = PR_FALSE;
|
|
break;
|
|
}
|
|
|
|
// See if there is now enough height for the float.
|
|
if (yb < mY + mAvailSpaceRect.height) {
|
|
// Winner. The bottom Y coordinate of the float is in
|
|
// this band.
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Restore Y coordinate and available space information
|
|
// regardless of the outcome.
|
|
mY = saveY;
|
|
GetAvailableSpace();
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
PRBool
|
|
nsBlockReflowState::FlowAndPlaceFloat(nsFloatCache* aFloatCache,
|
|
PRBool* aIsLeftFloat,
|
|
nsReflowStatus& aReflowStatus)
|
|
{
|
|
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;
|
|
|
|
nsPlaceholderFrame* placeholder = aFloatCache->mPlaceholder;
|
|
nsIFrame* floatFrame = placeholder->GetOutOfFlowFrame();
|
|
|
|
// Grab the float's display information
|
|
const nsStyleDisplay* floatDisplay = floatFrame->GetStyleDisplay();
|
|
|
|
// The float's old region, so we can propagate damage.
|
|
nsRect oldRegion = floatFrame->GetRect();
|
|
oldRegion.Inflate(aFloatCache->mMargins);
|
|
|
|
// 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(mSpaceManager->GetLowestRegionTop() + BorderPadding().top, mY);
|
|
|
|
// See if the float should clear any preceeding floats...
|
|
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
|
|
GetAvailableSpace();
|
|
|
|
NS_ASSERTION(floatFrame->GetParent() == mBlock,
|
|
"Float frame has wrong parent");
|
|
|
|
// Reflow the float
|
|
mBlock->ReflowFloat(*this, placeholder, aFloatCache, aReflowStatus);
|
|
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsRect region = floatFrame->GetRect();
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("flowed float: ");
|
|
nsFrame::ListTag(stdout, floatFrame);
|
|
printf(" (%d,%d,%d,%d)\n",
|
|
region.x, region.y, region.width, region.height);
|
|
}
|
|
#endif
|
|
|
|
nsSize floatSize = floatFrame->GetSize();
|
|
// Adjust the float size by its margin. That's the area that will
|
|
// impact the space manager.
|
|
floatSize.width += aFloatCache->mMargins.left + aFloatCache->mMargins.right;
|
|
floatSize.height += aFloatCache->mMargins.top + aFloatCache->mMargins.bottom;
|
|
|
|
// 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)) {
|
|
if (mAvailSpaceRect.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 += mAvailSpaceRect.height;
|
|
GetAvailableSpace();
|
|
} 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->mPlaceholder->GetOutOfFlowFrame() == floatFrame) {
|
|
break;
|
|
}
|
|
prevFrame = fc->mPlaceholder->GetOutOfFlowFrame();
|
|
fc = fc->Next();
|
|
}
|
|
|
|
if(prevFrame) {
|
|
//get the frame type
|
|
if (nsLayoutAtoms::tableOuterFrame == prevFrame->GetType()) {
|
|
//see if it has "align="
|
|
// IE makes a difference between align and he float property
|
|
nsIContent* content = prevFrame->GetContent();
|
|
if (content) {
|
|
nsAutoString value;
|
|
if (NS_CONTENT_ATTR_HAS_VALUE == content->GetAttr(kNameSpaceID_None, nsHTMLAtoms::align, value)) {
|
|
// we're interested only if previous frame is align=left
|
|
// IE messes things up when "right" (overlapping frames)
|
|
if (value.LowerCaseEqualsLiteral("left")) {
|
|
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 += mAvailSpaceRect.height;
|
|
GetAvailableSpace();
|
|
// reflow the float again now since we have more space
|
|
mBlock->ReflowFloat(*this, placeholder, aFloatCache, aReflowStatus);
|
|
// Get the floats bounding box and margin information
|
|
floatSize = floatFrame->GetSize();
|
|
// Adjust the float size by its margin. That's the area that will
|
|
// impact the space manager.
|
|
floatSize.width += aFloatCache->mMargins.left + aFloatCache->mMargins.right;
|
|
floatSize.height += aFloatCache->mMargins.top + aFloatCache->mMargins.bottom;
|
|
}
|
|
}
|
|
// If the float is continued, it will get the same absolute x value as its prev-in-flow
|
|
nsRect prevRect(0,0,0,0);
|
|
|
|
// 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.
|
|
PRBool isLeftFloat;
|
|
nscoord floatX, floatY;
|
|
if (NS_STYLE_FLOAT_LEFT == floatDisplay->mFloats) {
|
|
isLeftFloat = PR_TRUE;
|
|
floatX = mAvailSpaceRect.x;
|
|
}
|
|
else {
|
|
isLeftFloat = PR_FALSE;
|
|
if (NS_UNCONSTRAINEDSIZE != mAvailSpaceRect.width) {
|
|
if (!keepFloatOnSameLine) {
|
|
floatX = mAvailSpaceRect.XMost() - floatSize.width;
|
|
}
|
|
else {
|
|
// this is the IE quirk (see few lines above)
|
|
// the table is keept in the same line: don't let it overlap the previous float
|
|
floatX = mAvailSpaceRect.x;
|
|
}
|
|
}
|
|
else {
|
|
// For unconstrained reflows, pretend that a right float is
|
|
// instead a left float. This will make us end up with the
|
|
// correct unconstrained width, and we'll place it later.
|
|
floatX = mAvailSpaceRect.x;
|
|
}
|
|
}
|
|
*aIsLeftFloat = isLeftFloat;
|
|
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;
|
|
}
|
|
|
|
// Place the float in the space manager
|
|
// if the float split, then take up all of the vertical height
|
|
if (NS_FRAME_IS_NOT_COMPLETE(aReflowStatus) &&
|
|
(NS_UNCONSTRAINEDSIZE != mContentArea.height)) {
|
|
floatSize.height = PR_MAX(floatSize.height, mContentArea.height - floatY);
|
|
}
|
|
|
|
nsRect region(floatX, floatY, floatSize.width, floatSize.height);
|
|
#ifdef DEBUG
|
|
nsresult rv =
|
|
#endif
|
|
mSpaceManager->AddRectRegion(floatFrame, region);
|
|
NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv), "bad float placement");
|
|
|
|
// If the float's dimensions have changed, note the damage in the
|
|
// space 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);
|
|
nscoord bottom = NS_MAX(region.YMost(), oldRegion.YMost());
|
|
mSpaceManager->IncludeInDamage(top, bottom);
|
|
}
|
|
|
|
// Save away the floats region in the spacemanager, after making
|
|
// it relative to the containing block's frame instead of relative
|
|
// to the spacemanager translation (which is inset by the
|
|
// border+padding).
|
|
aFloatCache->mRegion.x = region.x + borderPadding.left;
|
|
aFloatCache->mRegion.y = region.y + borderPadding.top;
|
|
aFloatCache->mRegion.width = region.width;
|
|
aFloatCache->mRegion.height = region.height;
|
|
#ifdef NOISY_SPACEMANAGER
|
|
nscoord tx, ty;
|
|
mSpaceManager->GetTranslation(tx, ty);
|
|
nsFrame::ListTag(stdout, mBlock);
|
|
printf(": FlowAndPlaceFloat: AddRectRegion: txy=%d,%d (%d,%d) {%d,%d,%d,%d}\n",
|
|
tx, ty, mSpaceManagerX, mSpaceManagerY,
|
|
aFloatCache->mRegion.x, aFloatCache->mRegion.y,
|
|
aFloatCache->mRegion.width, aFloatCache->mRegion.height);
|
|
#endif
|
|
|
|
// Set the origin of the float frame, in frame coordinates. These
|
|
// coordinates are <b>not</b> relative to the spacemanager
|
|
// translation, therefore we have to factor in our border/padding.
|
|
nscoord x = borderPadding.left + aFloatCache->mMargins.left + region.x;
|
|
nscoord y = borderPadding.top + aFloatCache->mMargins.top + region.y;
|
|
|
|
// If float is relatively positioned, factor that in as well
|
|
// XXXldb Should this be done after handling the combined area
|
|
// below?
|
|
if (NS_STYLE_POSITION_RELATIVE == floatDisplay->mPosition) {
|
|
x += aFloatCache->mOffsets.left;
|
|
y += aFloatCache->mOffsets.top;
|
|
}
|
|
|
|
// 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.
|
|
floatFrame->SetPosition(nsPoint(x, y));
|
|
nsContainerFrame::PositionFrameView(floatFrame);
|
|
nsContainerFrame::PositionChildViews(floatFrame);
|
|
|
|
// Update the float combined area state
|
|
nsRect combinedArea = aFloatCache->mCombinedArea;
|
|
combinedArea.x += x;
|
|
combinedArea.y += y;
|
|
// When we are placing a right float in an unconstrained situation or
|
|
// when shrink wrapping, we don't apply it to the float combined area
|
|
// immediately, since there's no need to since we're guaranteed another
|
|
// reflow, and since there's no need to change the code that was
|
|
// necessary back when the float was positioned relative to
|
|
// NS_UNCONSTRAINEDSIZE.
|
|
if (isLeftFloat ||
|
|
!GetFlag(BRS_UNCONSTRAINEDWIDTH) ||
|
|
!GetFlag(BRS_SHRINKWRAPWIDTH)) {
|
|
mFloatCombinedArea.UnionRect(combinedArea, mFloatCombinedArea);
|
|
} else if (GetFlag(BRS_SHRINKWRAPWIDTH)) {
|
|
// Mark the line dirty so we come back and re-place the float once
|
|
// the shrink wrap width is determined
|
|
mCurrentLine->MarkDirty();
|
|
SetFlag(BRS_NEEDRESIZEREFLOW, PR_TRUE);
|
|
}
|
|
|
|
// Now restore mY
|
|
mY = saveY;
|
|
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsRect r = floatFrame->GetRect();
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("placed float: ");
|
|
nsFrame::ListTag(stdout, floatFrame);
|
|
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(nsFloatCacheList& aList)
|
|
{
|
|
nsFloatCache* fc = aList.Head();
|
|
while (fc) {
|
|
NS_ASSERTION(!fc->mIsCurrentLineFloat,
|
|
"A cl float crept into the bcl float list.");
|
|
if (!fc->mIsCurrentLineFloat) {
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("placing bcl float: ");
|
|
nsFrame::ListTag(stdout, fc->mPlaceholder->GetOutOfFlowFrame());
|
|
printf("\n");
|
|
}
|
|
#endif
|
|
|
|
// Place the float
|
|
PRBool isLeftFloat;
|
|
nsReflowStatus reflowStatus;
|
|
PRBool placed = FlowAndPlaceFloat(fc, &isLeftFloat, reflowStatus);
|
|
|
|
if (!placed || NS_FRAME_IS_TRUNCATED(reflowStatus)) {
|
|
// return before processing all of the floats, since the line will be pushed.
|
|
return PR_FALSE;
|
|
}
|
|
else if (NS_FRAME_IS_NOT_COMPLETE(reflowStatus)) {
|
|
// Create a continuation for the incomplete float and its placeholder.
|
|
nsresult rv = mBlock->SplitPlaceholder(*this, fc->mPlaceholder);
|
|
if (NS_FAILED(rv))
|
|
return PR_FALSE;
|
|
} else {
|
|
// Float is complete. We need to delete any leftover placeholders now.
|
|
nsIFrame* nextPlaceholder = fc->mPlaceholder->GetNextInFlow();
|
|
if (nextPlaceholder) {
|
|
nsHTMLContainerFrame* parent =
|
|
NS_STATIC_CAST(nsHTMLContainerFrame*, nextPlaceholder->GetParent());
|
|
parent->DeleteNextInFlowChild(mPresContext, nextPlaceholder);
|
|
}
|
|
}
|
|
}
|
|
fc = fc->Next();
|
|
}
|
|
return PR_TRUE;
|
|
}
|
|
|
|
nscoord
|
|
nsBlockReflowState::ClearFloats(nscoord aY, PRUint8 aBreakType)
|
|
{
|
|
#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);
|
|
mSpaceManager->List(stdout);
|
|
#endif
|
|
|
|
const nsMargin& bp = BorderPadding();
|
|
nscoord newY = mSpaceManager->ClearFloats(aY - bp.top, aBreakType);
|
|
newY += bp.top;
|
|
|
|
#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;
|
|
}
|
|
|