forked from mirrors/gecko-dev
42253715d7
Backed out changeset e2ab653f688a (bug 1008917) Backed out changeset b52154d8d900 (bug 1008917) Backed out changeset 2ab5b01da4de (bug 1008917) Backed out changeset f7a38df1d44f (bug 1008917) Backed out changeset 80304bb9a572 (bug 1008917) Backed out changeset 10ed89a302e9 (bug 1008917) Backed out changeset 161c41991d46 (bug 1008917) Backed out changeset 25b2475d2368 (bug 1008917) Backed out changeset b8000b31277c (bug 1008917) Backed out changeset 9afa5e7715e1 (bug 1008917) Backed out changeset 5c380c21351f (bug 1008917)
502 lines
20 KiB
C++
502 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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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 "nsAbsoluteContainingBlock.h"
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#include "nsContainerFrame.h"
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#include "nsGkAtoms.h"
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#include "nsIPresShell.h"
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#include "nsHTMLReflowState.h"
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#include "nsPresContext.h"
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#include "nsCSSFrameConstructor.h"
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#ifdef DEBUG
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#include "nsBlockFrame.h"
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static void PrettyUC(nscoord aSize, char* aBuf)
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{
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if (NS_UNCONSTRAINEDSIZE == aSize) {
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strcpy(aBuf, "UC");
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} else {
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if((int32_t)0xdeadbeef == aSize) {
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strcpy(aBuf, "deadbeef");
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} else {
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sprintf(aBuf, "%d", aSize);
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}
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}
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}
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#endif
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nsresult
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nsAbsoluteContainingBlock::SetInitialChildList(nsIFrame* aDelegatingFrame,
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ChildListID aListID,
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nsFrameList& aChildList)
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{
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NS_PRECONDITION(mChildListID == aListID, "unexpected child list name");
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#ifdef 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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ChildListID aListID,
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nsFrameList& aFrameList)
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{
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NS_ASSERTION(mChildListID == aListID, "unexpected child list");
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// Append the frames to our list of absolutely positioned frames
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#ifdef DEBUG
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nsFrame::VerifyDirtyBitSet(aFrameList);
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#endif
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mAbsoluteFrames.AppendFrames(nullptr, aFrameList);
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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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aDelegatingFrame->PresContext()->PresShell()->
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FrameNeedsReflow(aDelegatingFrame, nsIPresShell::eResize,
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NS_FRAME_HAS_DIRTY_CHILDREN);
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return NS_OK;
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}
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nsresult
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nsAbsoluteContainingBlock::InsertFrames(nsIFrame* aDelegatingFrame,
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ChildListID aListID,
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nsIFrame* aPrevFrame,
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nsFrameList& aFrameList)
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{
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NS_ASSERTION(mChildListID == aListID, "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 DEBUG
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nsFrame::VerifyDirtyBitSet(aFrameList);
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#endif
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mAbsoluteFrames.InsertFrames(nullptr, aPrevFrame, aFrameList);
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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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aDelegatingFrame->PresContext()->PresShell()->
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FrameNeedsReflow(aDelegatingFrame, nsIPresShell::eResize,
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NS_FRAME_HAS_DIRTY_CHILDREN);
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return NS_OK;
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}
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void
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nsAbsoluteContainingBlock::RemoveFrame(nsIFrame* aDelegatingFrame,
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ChildListID aListID,
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nsIFrame* aOldFrame)
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{
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NS_ASSERTION(mChildListID == aListID, "unexpected child list");
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nsIFrame* nif = aOldFrame->GetNextInFlow();
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if (nif) {
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static_cast<nsContainerFrame*>(nif->GetParent())
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->DeleteNextInFlowChild(nif, false);
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}
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mAbsoluteFrames.DestroyFrame(aOldFrame);
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}
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nsresult
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nsAbsoluteContainingBlock::Reflow(nsContainerFrame* aDelegatingFrame,
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nsPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aReflowStatus,
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const nsRect& aContainingBlock,
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bool aConstrainHeight,
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bool aCBWidthChanged,
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bool aCBHeightChanged,
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nsOverflowAreas* aOverflowAreas)
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{
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nsReflowStatus reflowStatus = NS_FRAME_COMPLETE;
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bool reflowAll = aReflowState.ShouldReflowAllKids();
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nsIFrame* kidFrame;
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nsOverflowContinuationTracker tracker(aDelegatingFrame, true);
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for (kidFrame = mAbsoluteFrames.FirstChild(); kidFrame; kidFrame = kidFrame->GetNextSibling()) {
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bool kidNeedsReflow = reflowAll || NS_SUBTREE_DIRTY(kidFrame) ||
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FrameDependsOnContainer(kidFrame, aCBWidthChanged, aCBHeightChanged);
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if (kidNeedsReflow && !aPresContext->HasPendingInterrupt()) {
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// Reflow the frame
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nsReflowStatus kidStatus = NS_FRAME_COMPLETE;
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ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, aReflowState,
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aContainingBlock,
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aConstrainHeight, kidFrame, kidStatus,
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aOverflowAreas);
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nsIFrame* nextFrame = kidFrame->GetNextInFlow();
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if (!NS_FRAME_IS_FULLY_COMPLETE(kidStatus)) {
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// Need a continuation
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if (!nextFrame) {
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nextFrame =
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aPresContext->PresShell()->FrameConstructor()->
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CreateContinuingFrame(aPresContext, kidFrame, aDelegatingFrame);
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}
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// Add it as an overflow container.
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//XXXfr This is a hack to fix some of our printing dataloss.
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// See bug 154892. Not sure how to do it "right" yet; probably want
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// to keep continuations within an nsAbsoluteContainingBlock eventually.
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tracker.Insert(nextFrame, kidStatus);
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NS_MergeReflowStatusInto(&reflowStatus, kidStatus);
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}
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else {
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// Delete any continuations
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if (nextFrame) {
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nsOverflowContinuationTracker::AutoFinish fini(&tracker, kidFrame);
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static_cast<nsContainerFrame*>(nextFrame->GetParent())
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->DeleteNextInFlowChild(nextFrame, true);
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}
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}
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}
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else {
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tracker.Skip(kidFrame, reflowStatus);
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if (aOverflowAreas) {
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aDelegatingFrame->ConsiderChildOverflow(*aOverflowAreas, kidFrame);
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}
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}
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// Make a CheckForInterrupt call, here, not just HasPendingInterrupt. That
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// will make sure that we end up reflowing aDelegatingFrame in cases when
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// one of our kids interrupted. Otherwise we'd set the dirty or
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// dirty-children bit on the kid in the condition below, and then when
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// reflow completes and we go to mark dirty bits on all ancestors of that
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// kid we'll immediately bail out, because the kid already has a dirty bit.
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// In particular, we won't set any dirty bits on aDelegatingFrame, so when
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// the following reflow happens we won't reflow the kid in question. This
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// might be slightly suboptimal in cases where |kidFrame| itself did not
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// interrupt, since we'll trigger a reflow of it too when it's not strictly
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// needed. But the logic to not do that is enough more complicated, and
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// the case enough of an edge case, that this is probably better.
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if (kidNeedsReflow && aPresContext->CheckForInterrupt(aDelegatingFrame)) {
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if (aDelegatingFrame->GetStateBits() & NS_FRAME_IS_DIRTY) {
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kidFrame->AddStateBits(NS_FRAME_IS_DIRTY);
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} else {
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kidFrame->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
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}
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}
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}
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// Abspos frames can't cause their parent to be incomplete,
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// only overflow incomplete.
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if (NS_FRAME_IS_NOT_COMPLETE(reflowStatus))
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NS_FRAME_SET_OVERFLOW_INCOMPLETE(reflowStatus);
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NS_MergeReflowStatusInto(&aReflowStatus, reflowStatus);
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return NS_OK;
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}
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static inline bool IsFixedPaddingSize(const nsStyleCoord& aCoord)
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{ return aCoord.ConvertsToLength(); }
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static inline bool IsFixedMarginSize(const nsStyleCoord& aCoord)
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{ return aCoord.ConvertsToLength(); }
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static inline bool IsFixedOffset(const nsStyleCoord& aCoord)
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{ return aCoord.ConvertsToLength(); }
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bool
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nsAbsoluteContainingBlock::FrameDependsOnContainer(nsIFrame* f,
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bool aCBWidthChanged,
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bool aCBHeightChanged)
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{
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const nsStylePosition* pos = f->StylePosition();
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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 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 false;
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}
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const nsStylePadding* padding = f->StylePadding();
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const nsStyleMargin* margin = f->StyleMargin();
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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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// XXX All of the enumerated values except -moz-available are ok too.
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if (pos->WidthDependsOnContainer() ||
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pos->MinWidthDependsOnContainer() ||
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pos->MaxWidthDependsOnContainer() ||
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!IsFixedPaddingSize(padding->mPadding.GetLeft()) ||
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!IsFixedPaddingSize(padding->mPadding.GetRight())) {
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return 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.GetLeft()) ||
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!IsFixedMarginSize(margin->mMargin.GetRight())) {
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return true;
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}
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if (f->StyleVisibility()->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 (!IsFixedOffset(pos->mOffset.GetLeft()) ||
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pos->mOffset.GetRightUnit() != eStyleUnit_Auto) {
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return true;
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}
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} else {
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if (!IsFixedOffset(pos->mOffset.GetLeft())) {
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return 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->HeightDependsOnContainer() &&
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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->MinHeightDependsOnContainer() ||
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pos->MaxHeightDependsOnContainer() ||
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!IsFixedPaddingSize(padding->mPadding.GetTop()) ||
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!IsFixedPaddingSize(padding->mPadding.GetBottom())) {
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return 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.GetTop()) ||
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!IsFixedMarginSize(margin->mMargin.GetBottom())) {
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return true;
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}
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if (!IsFixedOffset(pos->mOffset.GetTop())) {
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return true;
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}
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}
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return false;
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}
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void
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nsAbsoluteContainingBlock::DestroyFrames(nsIFrame* aDelegatingFrame,
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nsIFrame* aDestructRoot)
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{
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mAbsoluteFrames.DestroyFramesFrom(aDestructRoot);
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}
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void
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nsAbsoluteContainingBlock::MarkSizeDependentFramesDirty()
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{
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DoMarkFramesDirty(false);
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}
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void
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nsAbsoluteContainingBlock::MarkAllFramesDirty()
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{
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DoMarkFramesDirty(true);
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}
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void
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nsAbsoluteContainingBlock::DoMarkFramesDirty(bool aMarkAllDirty)
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{
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for (nsIFrame* kidFrame = mAbsoluteFrames.FirstChild();
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kidFrame;
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kidFrame = kidFrame->GetNextSibling()) {
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if (aMarkAllDirty) {
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kidFrame->AddStateBits(NS_FRAME_IS_DIRTY);
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} else if (FrameDependsOnContainer(kidFrame, true, true)) {
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// Add the weakest flags that will make sure we reflow this frame later
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kidFrame->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
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}
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}
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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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// mChildListID == kFixedList, 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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const nsRect& aContainingBlock,
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bool aConstrainHeight,
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nsIFrame* aKidFrame,
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nsReflowStatus& aStatus,
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nsOverflowAreas* aOverflowAreas)
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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 (aKidFrame) {
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nsAutoString name;
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aKidFrame->GetFrameName(name);
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printf("%s ", NS_LossyConvertUTF16toASCII(name).get());
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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.ComputedHeight(), 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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nscoord availWidth = aContainingBlock.width;
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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.ComputedPhysicalPadding().LeftRight();
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}
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nsHTMLReflowMetrics kidDesiredSize(aReflowState);
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nsHTMLReflowState kidReflowState(aPresContext, aReflowState, aKidFrame,
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nsSize(availWidth, NS_UNCONSTRAINEDSIZE),
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aContainingBlock.width,
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aContainingBlock.height);
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// Send the WillReflow() notification and position the frame
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aKidFrame->WillReflow(aPresContext);
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// Get the border values
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const nsMargin& border = aReflowState.mStyleBorder->GetComputedBorder();
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bool constrainHeight = (aReflowState.AvailableHeight() != NS_UNCONSTRAINEDSIZE)
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&& aConstrainHeight
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// Don't split if told not to (e.g. for fixed frames)
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&& (aDelegatingFrame->GetType() != nsGkAtoms::inlineFrame)
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//XXX we don't handle splitting frames for inline absolute containing blocks yet
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&& (aKidFrame->GetRect().y <= aReflowState.AvailableHeight());
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// Don't split things below the fold. (Ideally we shouldn't *have*
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// anything totally below the fold, but we can't position frames
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// across next-in-flow breaks yet.
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if (constrainHeight) {
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kidReflowState.AvailableHeight() = aReflowState.AvailableHeight() - border.top
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- kidReflowState.ComputedPhysicalMargin().top;
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if (NS_AUTOOFFSET != kidReflowState.ComputedPhysicalOffsets().top)
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kidReflowState.AvailableHeight() -= kidReflowState.ComputedPhysicalOffsets().top;
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}
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// Do the reflow
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nsresult 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.ComputedPhysicalOffsets().left) ||
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(NS_AUTOOFFSET == kidReflowState.ComputedPhysicalOffsets().top)) {
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nscoord aContainingBlockWidth = aContainingBlock.width;
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nscoord aContainingBlockHeight = aContainingBlock.height;
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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.ComputedPhysicalOffsets().left) {
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NS_ASSERTION(NS_AUTOOFFSET != kidReflowState.ComputedPhysicalOffsets().right,
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"Can't solve for both left and right");
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kidReflowState.ComputedPhysicalOffsets().left = aContainingBlockWidth -
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kidReflowState.ComputedPhysicalOffsets().right -
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kidReflowState.ComputedPhysicalMargin().right -
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kidDesiredSize.Width() -
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kidReflowState.ComputedPhysicalMargin().left;
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}
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if (NS_AUTOOFFSET == kidReflowState.ComputedPhysicalOffsets().top) {
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kidReflowState.ComputedPhysicalOffsets().top = aContainingBlockHeight -
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kidReflowState.ComputedPhysicalOffsets().bottom -
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kidReflowState.ComputedPhysicalMargin().bottom -
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kidDesiredSize.Height() -
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kidReflowState.ComputedPhysicalMargin().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.ComputedPhysicalOffsets().left + kidReflowState.ComputedPhysicalMargin().left,
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border.top + kidReflowState.ComputedPhysicalOffsets().top + kidReflowState.ComputedPhysicalMargin().top,
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kidDesiredSize.Width(), kidDesiredSize.Height());
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// Offset the frame rect by the given origin of the absolute containing block.
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// If the frame is auto-positioned on both sides of an axis, it will be
|
|
// positioned based on its containing block and we don't need to offset.
|
|
if (aContainingBlock.TopLeft() != nsPoint(0, 0)) {
|
|
if (!(kidReflowState.mStylePosition->mOffset.GetLeftUnit() == eStyleUnit_Auto &&
|
|
kidReflowState.mStylePosition->mOffset.GetRightUnit() == eStyleUnit_Auto)) {
|
|
rect.x += aContainingBlock.x;
|
|
}
|
|
if (!(kidReflowState.mStylePosition->mOffset.GetTopUnit() == eStyleUnit_Auto &&
|
|
kidReflowState.mStylePosition->mOffset.GetBottomUnit() == eStyleUnit_Auto)) {
|
|
rect.y += aContainingBlock.y;
|
|
}
|
|
}
|
|
|
|
aKidFrame->SetRect(rect);
|
|
|
|
nsView* 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.VisualOverflow());
|
|
} else {
|
|
nsContainerFrame::PositionChildViews(aKidFrame);
|
|
}
|
|
|
|
aKidFrame->DidReflow(aPresContext, &kidReflowState, nsDidReflowStatus::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<void*>(aKidFrame),
|
|
rect.x, rect.y, rect.width, rect.height);
|
|
}
|
|
#endif
|
|
|
|
if (aOverflowAreas) {
|
|
aOverflowAreas->UnionWith(kidDesiredSize.mOverflowAreas + rect.TopLeft());
|
|
}
|
|
|
|
return rv;
|
|
}
|