540 lines
21 KiB
C++
540 lines
21 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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#include "nsGridContainerFrame.h"
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#include "mozilla/Snprintf.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, int aBufSize)
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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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snprintf(aBuf, aBufSize, "%d", aSize);
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}
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}
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}
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#endif
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using namespace mozilla;
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void
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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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}
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void
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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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}
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void
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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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}
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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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nif->GetParent()->DeleteNextInFlowChild(nif, false);
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}
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mAbsoluteFrames.DestroyFrame(aOldFrame);
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}
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void
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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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// The 'width' check below is an optimization to avoid the virtual GetType()
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// call in most cases. 'aContainingBlock' isn't used for grid items,
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// each item has its own CB on a frame property instead.
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// @see nsGridContainerFrame::ReflowChildren
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const bool isGrid =
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aContainingBlock.width == nsGridContainerFrame::VERY_LIKELY_A_GRID_CONTAINER &&
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aDelegatingFrame->GetType() == nsGkAtoms::gridContainerFrame;
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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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const nsRect& cb = isGrid ? nsGridContainerFrame::GridItemCB(kidFrame)
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: aContainingBlock;
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ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, aReflowState, cb,
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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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aDelegatingFrame->IsFrameOfType(nsIFrame::eCanContainOverflowContainers)) {
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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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nextFrame->GetParent()->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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}
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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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WritingMode wm = f->GetWritingMode();
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if (wm.IsVertical() ? aCBHeightChanged : aCBWidthChanged) {
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// See if f's inline-size might have changed.
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// If margin-inline-start/end, padding-inline-start/end,
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// inline-size, min/max-inline-size are all lengths, 'none', or enumerated,
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// then our frame isize does not depend on the parent isize.
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// Note that borders never depend on the parent isize.
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// XXX All of the enumerated values except -moz-available are ok too.
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if (pos->ISizeDependsOnContainer(wm) ||
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pos->MinISizeDependsOnContainer(wm) ||
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pos->MaxISizeDependsOnContainer(wm) ||
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!IsFixedPaddingSize(padding->mPadding.GetIStart(wm)) ||
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!IsFixedPaddingSize(padding->mPadding.GetIEnd(wm))) {
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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.GetIStart(wm)) ||
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!IsFixedMarginSize(margin->mMargin.GetIEnd(wm))) {
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return true;
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}
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}
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if (wm.IsVertical() ? aCBWidthChanged : aCBHeightChanged) {
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// See if f's block-size might have changed.
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// If margin-block-start/end, padding-block-start/end,
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// min-block-size, and max-block-size are all lengths or 'none',
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// and bsize is a length or bsize and bend are auto and bstart is not auto,
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// then our frame bsize does not depend on the parent bsize.
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// Note that borders never depend on the parent bsize.
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if ((pos->BSizeDependsOnContainer(wm) &&
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!(pos->BSize(wm).GetUnit() == eStyleUnit_Auto &&
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pos->mOffset.GetBEndUnit(wm) == eStyleUnit_Auto &&
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pos->mOffset.GetBStartUnit(wm) != eStyleUnit_Auto)) ||
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pos->MinBSizeDependsOnContainer(wm) ||
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pos->MaxBSizeDependsOnContainer(wm) ||
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!IsFixedPaddingSize(padding->mPadding.GetBStart(wm)) ||
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!IsFixedPaddingSize(padding->mPadding.GetBEnd(wm))) {
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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.GetBStart(wm)) ||
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!IsFixedMarginSize(margin->mMargin.GetBEnd(wm))) {
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return true;
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}
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}
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// Since we store coordinates relative to top and left, the position
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// of a frame depends on that of its container if it is fixed relative
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// to the right or bottom, or if it is positioned using percentages
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// relative to the left or top. Because of the dependency on the
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// sides (left and top) that we use to store coordinates, these tests
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// are easier to do using physical coordinates rather than logical.
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if (aCBWidthChanged) {
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if (!IsFixedOffset(pos->mOffset.GetLeft())) {
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return true;
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}
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// Note that even if 'left' is a length, our position can still
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// depend on the containing block width, because if our direction or
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// writing-mode moves from right to left (in either block or inline
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// progression) and 'right' is not 'auto', we will discard 'left'
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// and be positioned relative to the containing block right edge.
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// 'left' length and 'right' auto is the only combination we can be
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// sure of.
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if ((wm.GetInlineDir() == WritingMode::eInlineRTL ||
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wm.GetBlockDir() == WritingMode::eBlockRL) &&
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pos->mOffset.GetRightUnit() != eStyleUnit_Auto) {
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return true;
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}
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}
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if (aCBHeightChanged) {
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if (!IsFixedOffset(pos->mOffset.GetTop())) {
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return true;
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}
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// See comment above for width changes.
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if (wm.GetInlineDir() == WritingMode::eInlineBTT &&
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pos->mOffset.GetBottomUnit() != eStyleUnit_Auto) {
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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) {
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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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void
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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 aConstrainBSize,
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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, 16);
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PrettyUC(aReflowState.AvailableHeight(), height, 16);
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printf(" a=%s,%s ", width, height);
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PrettyUC(aReflowState.ComputedWidth(), width, 16);
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PrettyUC(aReflowState.ComputedHeight(), height, 16);
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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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WritingMode wm = aKidFrame->GetWritingMode();
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LogicalSize logicalCBSize(wm, aContainingBlock.Size());
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nscoord availISize = logicalCBSize.ISize(wm);
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if (availISize == -1) {
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NS_ASSERTION(aReflowState.ComputedSize(wm).ISize(wm) !=
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NS_UNCONSTRAINEDSIZE,
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"Must have a useful inline-size _somewhere_");
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availISize =
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aReflowState.ComputedSizeWithPadding(wm).ISize(wm);
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}
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nsHTMLReflowState kidReflowState(aPresContext, aReflowState, aKidFrame,
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LogicalSize(wm, availISize,
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NS_UNCONSTRAINEDSIZE),
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&logicalCBSize);
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// Get the border values
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WritingMode outerWM = aReflowState.GetWritingMode();
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const LogicalMargin border(outerWM, aDelegatingFrame->GetUsedBorder());
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// see https://hg.mozilla.org/mozilla-central/file/fe69c6a1b4a3/layout/generic/nsAbsoluteContainingBlock.cpp
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// for various backbugs XXX
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const LogicalMargin margin =
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kidReflowState.ComputedLogicalMargin().ConvertTo(outerWM, wm);
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bool constrainBSize = (aReflowState.AvailableBSize() != NS_UNCONSTRAINEDSIZE)
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&& aConstrainBSize
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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->GetLogicalRect(aContainingBlock.Size()).BStart(wm) <=
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aReflowState.AvailableBSize());
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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 (constrainBSize) {
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kidReflowState.AvailableBSize() =
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aReflowState.AvailableBSize() - border.ConvertTo(wm, outerWM).BStart(wm) -
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kidReflowState.ComputedLogicalMargin().BStart(wm);
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if (NS_AUTOOFFSET != kidReflowState.ComputedLogicalOffsets().BStart(wm)) {
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kidReflowState.AvailableBSize() -=
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kidReflowState.ComputedLogicalOffsets().BStart(wm);
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}
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}
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// Do the reflow
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nsHTMLReflowMetrics kidDesiredSize(kidReflowState);
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aKidFrame->Reflow(aPresContext, kidDesiredSize, kidReflowState, aStatus);
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const LogicalSize kidSize = kidDesiredSize.Size(wm).ConvertTo(outerWM, wm);
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LogicalMargin offsets =
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kidReflowState.ComputedLogicalOffsets().ConvertTo(outerWM, wm);
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// If we're solving for start in either inline or block direction,
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// then compute it now that we know the dimensions.
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if ((NS_AUTOOFFSET == offsets.IStart(outerWM)) ||
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(NS_AUTOOFFSET == offsets.BStart(outerWM))) {
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if (-1 == logicalCBSize.ISize(wm)) {
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// Get the containing block width/height
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logicalCBSize =
|
|
kidReflowState.ComputeContainingBlockRectangle(aPresContext,
|
|
&aReflowState);
|
|
}
|
|
|
|
if (NS_AUTOOFFSET == offsets.IStart(outerWM)) {
|
|
NS_ASSERTION(NS_AUTOOFFSET != offsets.IEnd(outerWM),
|
|
"Can't solve for both start and end");
|
|
offsets.IStart(outerWM) =
|
|
logicalCBSize.ConvertTo(outerWM, wm).ISize(outerWM) -
|
|
offsets.IEnd(outerWM) - margin.IStartEnd(outerWM) -
|
|
kidSize.ISize(outerWM);
|
|
}
|
|
if (NS_AUTOOFFSET == offsets.BStart(outerWM)) {
|
|
offsets.BStart(outerWM) =
|
|
logicalCBSize.ConvertTo(outerWM, wm).BSize(outerWM) -
|
|
offsets.BEnd(outerWM) - margin.BStartEnd(outerWM) -
|
|
kidSize.BSize(outerWM);
|
|
}
|
|
kidReflowState.SetComputedLogicalOffsets(offsets.ConvertTo(wm, outerWM));
|
|
}
|
|
|
|
// Position the child relative to our padding edge
|
|
LogicalRect rect(outerWM,
|
|
border.IStart(outerWM) + offsets.IStart(outerWM) +
|
|
margin.IStart(outerWM),
|
|
border.BStart(outerWM) + offsets.BStart(outerWM) +
|
|
margin.BStart(outerWM),
|
|
kidSize.ISize(outerWM), kidSize.BSize(outerWM));
|
|
nsRect r =
|
|
rect.GetPhysicalRect(outerWM, logicalCBSize.GetPhysicalSize(wm) +
|
|
border.Size(outerWM).GetPhysicalSize(outerWM));
|
|
|
|
// Offset the frame rect by the given origin of the absolute containing block.
|
|
// 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)) {
|
|
const nsStyleSides& offsets = kidReflowState.mStylePosition->mOffset;
|
|
if (!(offsets.GetLeftUnit() == eStyleUnit_Auto &&
|
|
offsets.GetRightUnit() == eStyleUnit_Auto)) {
|
|
r.x += aContainingBlock.x;
|
|
}
|
|
if (!(offsets.GetTopUnit() == eStyleUnit_Auto &&
|
|
offsets.GetBottomUnit() == eStyleUnit_Auto)) {
|
|
r.y += aContainingBlock.y;
|
|
}
|
|
}
|
|
|
|
aKidFrame->SetRect(r);
|
|
|
|
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),
|
|
r.x, r.y, r.width, r.height);
|
|
}
|
|
#endif
|
|
|
|
if (aOverflowAreas) {
|
|
aOverflowAreas->UnionWith(kidDesiredSize.mOverflowAreas + r.TopLeft());
|
|
}
|
|
}
|