/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is mozilla.org code. * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998 * the Initial Developer. All Rights Reserved. * * Contributor(s): * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ /* * code for managing absolutely positioned children of a rendering * object that is a containing block for them */ #include "nsCOMPtr.h" #include "nsAbsoluteContainingBlock.h" #include "nsContainerFrame.h" #include "nsIPresShell.h" #include "nsHTMLContainerFrame.h" #include "nsHTMLParts.h" #include "nsPresContext.h" #include "nsFrameManager.h" #include "nsCSSFrameConstructor.h" #ifdef DEBUG #include "nsBlockFrame.h" #endif nsresult nsAbsoluteContainingBlock::SetInitialChildList(nsIFrame* aDelegatingFrame, nsIAtom* aListName, nsFrameList& aChildList) { NS_PRECONDITION(GetChildListName() == aListName, "unexpected child list name"); #ifdef NS_DEBUG nsFrame::VerifyDirtyBitSet(aChildList); #endif mAbsoluteFrames.SetFrames(aChildList); return NS_OK; } nsresult nsAbsoluteContainingBlock::AppendFrames(nsIFrame* aDelegatingFrame, nsIAtom* aListName, nsFrameList& aFrameList) { NS_ASSERTION(GetChildListName() == aListName, "unexpected child list"); // Append the frames to our list of absolutely positioned frames #ifdef NS_DEBUG nsFrame::VerifyDirtyBitSet(aFrameList); #endif mAbsoluteFrames.AppendFrames(nsnull, aFrameList); // no damage to intrinsic widths, since absolutely positioned frames can't // change them aDelegatingFrame->PresContext()->PresShell()-> FrameNeedsReflow(aDelegatingFrame, nsIPresShell::eResize, NS_FRAME_HAS_DIRTY_CHILDREN); return NS_OK; } nsresult nsAbsoluteContainingBlock::InsertFrames(nsIFrame* aDelegatingFrame, nsIAtom* aListName, nsIFrame* aPrevFrame, nsFrameList& aFrameList) { NS_ASSERTION(GetChildListName() == aListName, "unexpected child list"); NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == aDelegatingFrame, "inserting after sibling frame with different parent"); #ifdef NS_DEBUG nsFrame::VerifyDirtyBitSet(aFrameList); #endif mAbsoluteFrames.InsertFrames(nsnull, aPrevFrame, aFrameList); // no damage to intrinsic widths, since absolutely positioned frames can't // change them aDelegatingFrame->PresContext()->PresShell()-> FrameNeedsReflow(aDelegatingFrame, nsIPresShell::eResize, NS_FRAME_HAS_DIRTY_CHILDREN); return NS_OK; } void nsAbsoluteContainingBlock::RemoveFrame(nsIFrame* aDelegatingFrame, nsIAtom* aListName, nsIFrame* aOldFrame) { NS_ASSERTION(GetChildListName() == aListName, "unexpected child list"); nsIFrame* nif = aOldFrame->GetNextInFlow(); if (nif) { static_cast(nif->GetParent()) ->DeleteNextInFlowChild(aOldFrame->PresContext(), nif, PR_FALSE); } mAbsoluteFrames.DestroyFrame(aOldFrame); } nsresult nsAbsoluteContainingBlock::Reflow(nsContainerFrame* aDelegatingFrame, nsPresContext* aPresContext, const nsHTMLReflowState& aReflowState, nsReflowStatus& aReflowStatus, nscoord aContainingBlockWidth, nscoord aContainingBlockHeight, PRBool aConstrainHeight, PRBool aCBWidthChanged, PRBool aCBHeightChanged, nsRect* aChildBounds) { // Initialize OUT parameter if (aChildBounds) aChildBounds->SetRect(0, 0, 0, 0); nsReflowStatus reflowStatus = NS_FRAME_COMPLETE; PRBool reflowAll = aReflowState.ShouldReflowAllKids(); nsIFrame* kidFrame; nsOverflowContinuationTracker tracker(aPresContext, aDelegatingFrame, PR_TRUE); for (kidFrame = mAbsoluteFrames.FirstChild(); kidFrame; kidFrame = kidFrame->GetNextSibling()) { PRBool kidNeedsReflow = reflowAll || NS_SUBTREE_DIRTY(kidFrame) || FrameDependsOnContainer(kidFrame, aCBWidthChanged, aCBHeightChanged); if (kidNeedsReflow && !aPresContext->HasPendingInterrupt()) { // Reflow the frame nsReflowStatus kidStatus = NS_FRAME_COMPLETE; ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, aReflowState, aContainingBlockWidth, aContainingBlockHeight, aConstrainHeight, kidFrame, kidStatus, aChildBounds); nsIFrame* nextFrame = kidFrame->GetNextInFlow(); if (!NS_FRAME_IS_FULLY_COMPLETE(kidStatus)) { // Need a continuation if (!nextFrame) { nsresult rv = aPresContext->PresShell()->FrameConstructor()-> CreateContinuingFrame(aPresContext, kidFrame, aDelegatingFrame, &nextFrame); NS_ENSURE_SUCCESS(rv, rv); } // Add it as an overflow container. //XXXfr This is a hack to fix some of our printing dataloss. // See bug 154892. Not sure how to do it "right" yet; probably want // to keep continuations within an nsAbsoluteContainingBlock eventually. tracker.Insert(nextFrame, kidStatus); NS_MergeReflowStatusInto(&reflowStatus, kidStatus); } else { // Delete any continuations if (nextFrame) { tracker.Finish(kidFrame); static_cast(nextFrame->GetParent()) ->DeleteNextInFlowChild(aPresContext, nextFrame, PR_TRUE); } } } else { tracker.Skip(kidFrame, reflowStatus); if (aChildBounds) { aChildBounds->UnionRect(*aChildBounds, kidFrame->GetOverflowRect() + kidFrame->GetPosition()); } } // Make a CheckForInterrupt call, here, not just HasPendingInterrupt. That // will make sure that we end up reflowing aDelegatingFrame in cases when // one of our kids interrupted. Otherwise we'd set the dirty or // dirty-children bit on the kid in the condition below, and then when // reflow completes and we go to mark dirty bits on all ancestors of that // kid we'll immediately bail out, because the kid already has a dirty bit. // In particular, we won't set any dirty bits on aDelegatingFrame, so when // the following reflow happens we won't reflow the kid in question. This // might be slightly suboptimal in cases where |kidFrame| itself did not // interrupt, since we'll trigger a reflow of it too when it's not strictly // needed. But the logic to not do that is enough more complicated, and // the case enough of an edge case, that this is probably better. if (kidNeedsReflow && aPresContext->CheckForInterrupt(aDelegatingFrame)) { if (aDelegatingFrame->GetStateBits() & NS_FRAME_IS_DIRTY) { kidFrame->AddStateBits(NS_FRAME_IS_DIRTY); } else { kidFrame->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN); } } } // Abspos frames can't cause their parent to be incomplete, // only overflow incomplete. if (NS_FRAME_IS_NOT_COMPLETE(reflowStatus)) NS_FRAME_SET_OVERFLOW_INCOMPLETE(reflowStatus); NS_MergeReflowStatusInto(&aReflowStatus, reflowStatus); return NS_OK; } static inline bool IsFixedPaddingSize(const nsStyleCoord& aCoord) { return aCoord.ConvertsToLength(); } static inline bool IsFixedMarginSize(const nsStyleCoord& aCoord) { return aCoord.ConvertsToLength(); } static inline bool IsFixedOffset(const nsStyleCoord& aCoord) { return aCoord.ConvertsToLength(); } PRBool nsAbsoluteContainingBlock::FrameDependsOnContainer(nsIFrame* f, PRBool aCBWidthChanged, PRBool aCBHeightChanged) { const nsStylePosition* pos = f->GetStylePosition(); // See if f's position might have changed because it depends on a // placeholder's position // This can happen in the following cases: // 1) Vertical positioning. "top" must be auto and "bottom" must be auto // (otherwise the vertical position is completely determined by // whichever of them is not auto and the height). // 2) Horizontal positioning. "left" must be auto and "right" must be auto // (otherwise the horizontal position is completely determined by // whichever of them is not auto and the width). // See nsHTMLReflowState::InitAbsoluteConstraints -- these are the // only cases when we call CalculateHypotheticalBox(). if ((pos->mOffset.GetTopUnit() == eStyleUnit_Auto && pos->mOffset.GetBottomUnit() == eStyleUnit_Auto) || (pos->mOffset.GetLeftUnit() == eStyleUnit_Auto && pos->mOffset.GetRightUnit() == eStyleUnit_Auto)) { return PR_TRUE; } if (!aCBWidthChanged && !aCBHeightChanged) { // skip getting style data return PR_FALSE; } const nsStylePadding* padding = f->GetStylePadding(); const nsStyleMargin* margin = f->GetStyleMargin(); if (aCBWidthChanged) { // See if f's width might have changed. // If border-left, border-right, padding-left, padding-right, // width, min-width, and max-width are all lengths, 'none', or enumerated, // then our frame width does not depend on the parent width. // Note that borders never depend on the parent width // XXX All of the enumerated values except -moz-available are ok too. if (pos->WidthDependsOnContainer() || pos->MinWidthDependsOnContainer() || pos->MaxWidthDependsOnContainer() || !IsFixedPaddingSize(padding->mPadding.GetLeft()) || !IsFixedPaddingSize(padding->mPadding.GetRight())) { return PR_TRUE; } // See if f's position might have changed. If we're RTL then the // rules are slightly different. We'll assume percentage or auto // margins will always induce a dependency on the size if (!IsFixedMarginSize(margin->mMargin.GetLeft()) || !IsFixedMarginSize(margin->mMargin.GetRight())) { return PR_TRUE; } if (f->GetStyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) { // Note that even if 'left' is a length, our position can // still depend on the containing block width, because if // 'right' is also a length we will discard 'left' and be // positioned relative to the containing block right edge. // 'left' length and 'right' auto is the only combination // we can be sure of. if (!IsFixedOffset(pos->mOffset.GetLeft()) || pos->mOffset.GetRightUnit() != eStyleUnit_Auto) { return PR_TRUE; } } else { if (!IsFixedOffset(pos->mOffset.GetLeft())) { return PR_TRUE; } } } if (aCBHeightChanged) { // See if f's height might have changed. // If border-top, border-bottom, padding-top, padding-bottom, // min-height, and max-height are all lengths or 'none', // and height is a length or height and bottom are auto and top is not auto, // then our frame height does not depend on the parent height. // Note that borders never depend on the parent height if ((pos->HeightDependsOnContainer() && !(pos->mHeight.GetUnit() == eStyleUnit_Auto && pos->mOffset.GetBottomUnit() == eStyleUnit_Auto && pos->mOffset.GetTopUnit() != eStyleUnit_Auto)) || pos->MinHeightDependsOnContainer() || pos->MaxHeightDependsOnContainer() || !IsFixedPaddingSize(padding->mPadding.GetTop()) || !IsFixedPaddingSize(padding->mPadding.GetBottom())) { return PR_TRUE; } // See if f's position might have changed. if (!IsFixedMarginSize(margin->mMargin.GetTop()) || !IsFixedMarginSize(margin->mMargin.GetBottom())) { return PR_TRUE; } if (!IsFixedOffset(pos->mOffset.GetTop())) { return PR_TRUE; } } return PR_FALSE; } void nsAbsoluteContainingBlock::DestroyFrames(nsIFrame* aDelegatingFrame, nsIFrame* aDestructRoot) { mAbsoluteFrames.DestroyFramesFrom(aDestructRoot); } void nsAbsoluteContainingBlock::MarkSizeDependentFramesDirty() { DoMarkFramesDirty(PR_FALSE); } void nsAbsoluteContainingBlock::MarkAllFramesDirty() { DoMarkFramesDirty(PR_TRUE); } void nsAbsoluteContainingBlock::DoMarkFramesDirty(PRBool aMarkAllDirty) { for (nsIFrame* kidFrame = mAbsoluteFrames.FirstChild(); kidFrame; kidFrame = kidFrame->GetNextSibling()) { if (aMarkAllDirty) { kidFrame->AddStateBits(NS_FRAME_IS_DIRTY); } else if (FrameDependsOnContainer(kidFrame, PR_TRUE, PR_TRUE)) { // Add the weakest flags that will make sure we reflow this frame later kidFrame->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN); } } } // XXX Optimize the case where it's a resize reflow and the absolutely // positioned child has the exact same size and position and skip the // reflow... // When bug 154892 is checked in, make sure that when // GetChildListName() == nsGkAtoms::fixedList, the height is unconstrained. // since we don't allow replicated frames to split. nsresult nsAbsoluteContainingBlock::ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame, nsPresContext* aPresContext, const nsHTMLReflowState& aReflowState, nscoord aContainingBlockWidth, nscoord aContainingBlockHeight, PRBool aConstrainHeight, nsIFrame* aKidFrame, nsReflowStatus& aStatus, nsRect* aChildBounds) { #ifdef DEBUG if (nsBlockFrame::gNoisyReflow) { nsFrame::IndentBy(stdout,nsBlockFrame::gNoiseIndent); printf("abs pos "); if (aKidFrame) { nsAutoString name; aKidFrame->GetFrameName(name); printf("%s ", NS_LossyConvertUTF16toASCII(name).get()); } char width[16]; char height[16]; PrettyUC(aReflowState.availableWidth, width); PrettyUC(aReflowState.availableHeight, height); printf(" a=%s,%s ", width, height); PrettyUC(aReflowState.ComputedWidth(), width); PrettyUC(aReflowState.ComputedHeight(), height); printf("c=%s,%s \n", width, height); } AutoNoisyIndenter indent(nsBlockFrame::gNoisy); #endif // DEBUG // Store position and overflow rect so taht we can invalidate the correct // area if the position changes nsRect oldOverflowRect(aKidFrame->GetOverflowRect() + aKidFrame->GetPosition()); nsRect oldRect = aKidFrame->GetRect(); nsresult rv; // Get the border values const nsMargin& border = aReflowState.mStyleBorder->GetActualBorder(); nscoord availWidth = aContainingBlockWidth; if (availWidth == -1) { NS_ASSERTION(aReflowState.ComputedWidth() != NS_UNCONSTRAINEDSIZE, "Must have a useful width _somewhere_"); availWidth = aReflowState.ComputedWidth() + aReflowState.mComputedPadding.LeftRight(); } nsHTMLReflowMetrics kidDesiredSize; nsHTMLReflowState kidReflowState(aPresContext, aReflowState, aKidFrame, nsSize(availWidth, NS_UNCONSTRAINEDSIZE), aContainingBlockWidth, aContainingBlockHeight); // Send the WillReflow() notification and position the frame aKidFrame->WillReflow(aPresContext); PRBool constrainHeight = (aReflowState.availableHeight != NS_UNCONSTRAINEDSIZE) && aConstrainHeight // Don't split if told not to (e.g. for fixed frames) && (aDelegatingFrame->GetType() != nsGkAtoms::positionedInlineFrame) //XXX we don't handle splitting frames for inline absolute containing blocks yet && (aKidFrame->GetRect().y <= aReflowState.availableHeight); // Don't split things below the fold. (Ideally we shouldn't *have* // anything totally below the fold, but we can't position frames // across next-in-flow breaks yet. if (constrainHeight) { kidReflowState.availableHeight = aReflowState.availableHeight - border.top - kidReflowState.mComputedMargin.top; if (NS_AUTOOFFSET != kidReflowState.mComputedOffsets.top) kidReflowState.availableHeight -= kidReflowState.mComputedOffsets.top; } // Do the reflow rv = aKidFrame->Reflow(aPresContext, kidDesiredSize, kidReflowState, aStatus); // If we're solving for 'left' or 'top', then compute it now that we know the // width/height if ((NS_AUTOOFFSET == kidReflowState.mComputedOffsets.left) || (NS_AUTOOFFSET == kidReflowState.mComputedOffsets.top)) { if (-1 == aContainingBlockWidth) { // Get the containing block width/height kidReflowState.ComputeContainingBlockRectangle(aPresContext, &aReflowState, aContainingBlockWidth, aContainingBlockHeight); } if (NS_AUTOOFFSET == kidReflowState.mComputedOffsets.left) { NS_ASSERTION(NS_AUTOOFFSET != kidReflowState.mComputedOffsets.right, "Can't solve for both left and right"); kidReflowState.mComputedOffsets.left = aContainingBlockWidth - kidReflowState.mComputedOffsets.right - kidReflowState.mComputedMargin.right - kidDesiredSize.width - kidReflowState.mComputedMargin.left; } if (NS_AUTOOFFSET == kidReflowState.mComputedOffsets.top) { kidReflowState.mComputedOffsets.top = aContainingBlockHeight - kidReflowState.mComputedOffsets.bottom - kidReflowState.mComputedMargin.bottom - kidDesiredSize.height - kidReflowState.mComputedMargin.top; } } // Position the child relative to our padding edge nsRect rect(border.left + kidReflowState.mComputedOffsets.left + kidReflowState.mComputedMargin.left, border.top + kidReflowState.mComputedOffsets.top + kidReflowState.mComputedMargin.top, kidDesiredSize.width, kidDesiredSize.height); aKidFrame->SetRect(rect); nsIView* view = aKidFrame->GetView(); if (view) { // Size and position the view and set its opacity, visibility, content // transparency, and clip nsContainerFrame::SyncFrameViewAfterReflow(aPresContext, aKidFrame, view, &kidDesiredSize.mOverflowArea); } else { nsContainerFrame::PositionChildViews(aKidFrame); } if (oldRect.TopLeft() != rect.TopLeft() || (aDelegatingFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW)) { // The frame moved aKidFrame->GetParent()->Invalidate(oldOverflowRect); aKidFrame->InvalidateFrameSubtree(); } else if (oldRect.Size() != rect.Size()) { // Invalidate the area where the frame changed size. nscoord innerWidth = NS_MIN(oldRect.width, rect.width); nscoord innerHeight = NS_MIN(oldRect.height, rect.height); nscoord outerWidth = NS_MAX(oldRect.width, rect.width); nscoord outerHeight = NS_MAX(oldRect.height, rect.height); aKidFrame->GetParent()->Invalidate( nsRect(rect.x + innerWidth, rect.y, outerWidth - innerWidth, outerHeight)); // Invalidate the horizontal strip aKidFrame->GetParent()->Invalidate( nsRect(rect.x, rect.y + innerHeight, outerWidth, outerHeight - innerHeight)); } aKidFrame->DidReflow(aPresContext, &kidReflowState, NS_FRAME_REFLOW_FINISHED); #ifdef DEBUG if (nsBlockFrame::gNoisyReflow) { nsFrame::IndentBy(stdout,nsBlockFrame::gNoiseIndent - 1); printf("abs pos "); if (aKidFrame) { nsAutoString name; aKidFrame->GetFrameName(name); printf("%s ", NS_LossyConvertUTF16toASCII(name).get()); } printf("%p rect=%d,%d,%d,%d\n", static_cast(aKidFrame), rect.x, rect.y, rect.width, rect.height); } #endif if (aChildBounds) aChildBounds->UnionRect(*aChildBounds, kidDesiredSize.mOverflowArea + rect.TopLeft()); 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