forked from mirrors/gecko-dev
815 lines
35 KiB
C++
815 lines
35 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "mozilla/CSSAlignUtils.h"
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#include "mozilla/PresShell.h"
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#include "mozilla/ReflowInput.h"
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#include "nsPlaceholderFrame.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/Sprintf.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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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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typedef mozilla::CSSAlignUtils::AlignJustifyFlags AlignJustifyFlags;
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void nsAbsoluteContainingBlock::SetInitialChildList(nsIFrame* aDelegatingFrame,
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ChildListID aListID,
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nsFrameList& aChildList) {
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MOZ_ASSERT(mChildListID == aListID, "unexpected child list name");
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#ifdef DEBUG
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nsFrame::VerifyDirtyBitSet(aChildList);
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for (nsIFrame* f : aChildList) {
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MOZ_ASSERT(f->GetParent() == aDelegatingFrame, "Unexpected parent");
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}
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#endif
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mAbsoluteFrames.SetFrames(aChildList);
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}
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void nsAbsoluteContainingBlock::AppendFrames(nsIFrame* aDelegatingFrame,
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ChildListID aListID,
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nsFrameList& aFrameList) {
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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->PresShell()->FrameNeedsReflow(
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aDelegatingFrame, IntrinsicDirty::Resize, NS_FRAME_HAS_DIRTY_CHILDREN);
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}
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void 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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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->PresShell()->FrameNeedsReflow(
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aDelegatingFrame, IntrinsicDirty::Resize, NS_FRAME_HAS_DIRTY_CHILDREN);
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}
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void nsAbsoluteContainingBlock::RemoveFrame(nsIFrame* aDelegatingFrame,
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ChildListID aListID,
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nsIFrame* aOldFrame) {
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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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static void MaybeMarkAncestorsAsHavingDescendantDependentOnItsStaticPos(
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nsIFrame* aFrame, nsIFrame* aContainingBlockFrame) {
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MOZ_ASSERT(aFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW));
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if (!aFrame->StylePosition()->NeedsHypotheticalPositionIfAbsPos()) {
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return;
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}
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// We should have set the bit when reflowing the previous continuations
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// already.
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if (aFrame->GetPrevContinuation()) {
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return;
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}
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auto* placeholder = aFrame->GetPlaceholderFrame();
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MOZ_ASSERT(placeholder);
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// Only fixed-pos frames can escape their containing block.
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if (!placeholder->HasAnyStateBits(PLACEHOLDER_FOR_FIXEDPOS)) {
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return;
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}
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for (nsIFrame* ancestor = placeholder->GetParent(); ancestor;
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ancestor = ancestor->GetParent()) {
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// Walk towards the ancestor's first continuation. That's the only one that
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// really matters, since it's the only one restyling will look at. We also
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// flag the following continuations just so it's caught on the first
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// early-return ones just to avoid walking them over and over.
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do {
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if (ancestor->DescendantMayDependOnItsStaticPosition()) {
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return;
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}
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// Moving the containing block or anything above it would move our static
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// position as well, so no need to flag it or any of its ancestors.
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if (aFrame == aContainingBlockFrame) {
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return;
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}
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ancestor->SetDescendantMayDependOnItsStaticPosition(true);
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nsIFrame* prev = ancestor->GetPrevContinuation();
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if (!prev) {
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break;
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}
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ancestor = prev;
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} while (true);
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}
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}
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void nsAbsoluteContainingBlock::Reflow(nsContainerFrame* aDelegatingFrame,
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nsPresContext* aPresContext,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aReflowStatus,
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const nsRect& aContainingBlock,
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AbsPosReflowFlags aFlags,
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nsOverflowAreas* aOverflowAreas) {
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nsReflowStatus reflowStatus;
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const bool reflowAll = aReflowInput.ShouldReflowAllKids();
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const bool isGrid = !!(aFlags & AbsPosReflowFlags::IsGridContainerCB);
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nsIFrame* kidFrame;
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nsOverflowContinuationTracker tracker(aDelegatingFrame, true);
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for (kidFrame = mAbsoluteFrames.FirstChild(); kidFrame;
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kidFrame = kidFrame->GetNextSibling()) {
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bool kidNeedsReflow =
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reflowAll || NS_SUBTREE_DIRTY(kidFrame) ||
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FrameDependsOnContainer(
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kidFrame, !!(aFlags & AbsPosReflowFlags::CBWidthChanged),
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!!(aFlags & AbsPosReflowFlags::CBHeightChanged));
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if (NS_SUBTREE_DIRTY(kidFrame)) {
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MaybeMarkAncestorsAsHavingDescendantDependentOnItsStaticPos(
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kidFrame, aDelegatingFrame);
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}
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nscoord availBSize = aReflowInput.AvailableBSize();
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const nsRect& cb =
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isGrid ? nsGridContainerFrame::GridItemCB(kidFrame) : aContainingBlock;
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WritingMode containerWM = aReflowInput.GetWritingMode();
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if (!kidNeedsReflow && availBSize != NS_UNCONSTRAINEDSIZE) {
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// If we need to redo pagination on the kid, we need to reflow it.
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// This can happen either if the available height shrunk and the
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// kid (or its overflow that creates overflow containers) is now
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// too large to fit in the available height, or if the available
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// height has increased and the kid has a next-in-flow that we
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// might need to pull from.
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WritingMode kidWM = kidFrame->GetWritingMode();
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if (containerWM.GetBlockDir() != kidWM.GetBlockDir()) {
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// Not sure what the right test would be here.
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kidNeedsReflow = true;
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} else {
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nscoord kidBEnd = kidFrame->GetLogicalRect(cb.Size()).BEnd(kidWM);
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nscoord kidOverflowBEnd =
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LogicalRect(containerWM,
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// Use ...RelativeToSelf to ignore transforms
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kidFrame->GetScrollableOverflowRectRelativeToSelf() +
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kidFrame->GetPosition(),
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aContainingBlock.Size())
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.BEnd(containerWM);
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MOZ_ASSERT(kidOverflowBEnd >= kidBEnd);
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if (kidOverflowBEnd > availBSize ||
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(kidBEnd < availBSize && kidFrame->GetNextInFlow())) {
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kidNeedsReflow = true;
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}
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}
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}
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if (kidNeedsReflow && !aPresContext->HasPendingInterrupt()) {
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// Reflow the frame
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nsReflowStatus kidStatus;
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ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, aReflowInput, cb,
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aFlags, kidFrame, kidStatus, aOverflowAreas);
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MOZ_ASSERT(!kidStatus.IsInlineBreakBefore(),
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"ShouldAvoidBreakInside should prevent this from happening");
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nsIFrame* nextFrame = kidFrame->GetNextInFlow();
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if (!kidStatus.IsFullyComplete() &&
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aDelegatingFrame->IsFrameOfType(
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nsIFrame::eCanContainOverflowContainers)) {
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// Need a continuation
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if (!nextFrame) {
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nextFrame = aPresContext->PresShell()
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->FrameConstructor()
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->CreateContinuingFrame(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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reflowStatus.MergeCompletionStatusFrom(kidStatus);
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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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} 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->HasAnyStateBits(NS_FRAME_IS_DIRTY)) {
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kidFrame->MarkSubtreeDirty();
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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 (reflowStatus.IsIncomplete()) reflowStatus.SetOverflowIncomplete();
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aReflowStatus.MergeCompletionStatusFrom(reflowStatus);
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}
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static inline bool IsFixedPaddingSize(const LengthPercentage& aCoord) {
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return aCoord.ConvertsToLength();
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}
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static inline bool IsFixedMarginSize(const LengthPercentageOrAuto& aCoord) {
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return aCoord.ConvertsToLength();
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}
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static inline bool IsFixedOffset(const LengthPercentageOrAuto& aCoord) {
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return aCoord.ConvertsToLength();
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}
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bool nsAbsoluteContainingBlock::FrameDependsOnContainer(nsIFrame* f,
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bool aCBWidthChanged,
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bool aCBHeightChanged) {
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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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if (pos->NeedsHypotheticalPositionIfAbsPos()) {
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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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//
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// FIXME(emilio): Should the BSize(wm).IsAuto() check also for the extremum
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// lengths?
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if ((pos->BSizeDependsOnContainer(wm) &&
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!(pos->BSize(wm).IsAuto() && pos->mOffset.GetBEnd(wm).IsAuto() &&
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!pos->mOffset.GetBStart(wm).IsAuto())) ||
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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.Get(eSideLeft))) {
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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.Get(eSideRight).IsAuto()) {
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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.Get(eSideTop))) {
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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.Get(eSideBottom).IsAuto()) {
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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 nsAbsoluteContainingBlock::DestroyFrames(
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nsIFrame* aDelegatingFrame, nsIFrame* aDestructRoot,
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PostDestroyData& aPostDestroyData) {
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mAbsoluteFrames.DestroyFramesFrom(aDestructRoot, aPostDestroyData);
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}
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void nsAbsoluteContainingBlock::MarkSizeDependentFramesDirty() {
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DoMarkFramesDirty(false);
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}
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void nsAbsoluteContainingBlock::MarkAllFramesDirty() {
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DoMarkFramesDirty(true);
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}
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void nsAbsoluteContainingBlock::DoMarkFramesDirty(bool aMarkAllDirty) {
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for (nsIFrame* kidFrame : mAbsoluteFrames) {
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if (aMarkAllDirty) {
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kidFrame->MarkSubtreeDirty();
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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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// Given an out-of-flow frame, this method returns the parent frame of its
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// placeholder frame or null if it doesn't have a placeholder for some reason.
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static nsContainerFrame* GetPlaceholderContainer(nsIFrame* aPositionedFrame) {
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nsIFrame* placeholder = aPositionedFrame->GetPlaceholderFrame();
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return placeholder ? placeholder->GetParent() : nullptr;
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}
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/**
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* This function returns the offset of an abs/fixed-pos child's static
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* position, with respect to the "start" corner of its alignment container,
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* according to CSS Box Alignment. This function only operates in a single
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* axis at a time -- callers can choose which axis via the |aAbsPosCBAxis|
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* parameter.
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*
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* @param aKidReflowInput The ReflowInput for the to-be-aligned abspos child.
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* @param aKidSizeInAbsPosCBWM The child frame's size (after it's been given
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* the opportunity to reflow), in terms of
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* aAbsPosCBWM.
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* @param aAbsPosCBSize The abspos CB size, in terms of aAbsPosCBWM.
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* @param aPlaceholderContainer The parent of the child frame's corresponding
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* placeholder frame, cast to a nsContainerFrame.
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* (This will help us choose which alignment enum
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* we should use for the child.)
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* @param aAbsPosCBWM The child frame's containing block's WritingMode.
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* @param aAbsPosCBAxis The axis (of the containing block) that we should
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* be doing this computation for.
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*/
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static nscoord OffsetToAlignedStaticPos(const ReflowInput& aKidReflowInput,
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const LogicalSize& aKidSizeInAbsPosCBWM,
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const LogicalSize& aAbsPosCBSize,
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nsContainerFrame* aPlaceholderContainer,
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WritingMode aAbsPosCBWM,
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LogicalAxis aAbsPosCBAxis) {
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if (!aPlaceholderContainer) {
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// (The placeholder container should be the thing that kicks this whole
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// process off, by setting PLACEHOLDER_STATICPOS_NEEDS_CSSALIGN. So it
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// should exist... but bail gracefully if it doesn't.)
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NS_ERROR(
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"Missing placeholder-container when computing a "
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"CSS Box Alignment static position");
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return 0;
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}
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|
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// (Most of this function is simply preparing args that we'll pass to
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|
// AlignJustifySelf at the end.)
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|
|
// NOTE: Our alignment container is aPlaceholderContainer's content-box
|
|
// (or an area within it, if aPlaceholderContainer is a grid). So, we'll
|
|
// perform most of our arithmetic/alignment in aPlaceholderContainer's
|
|
// WritingMode. For brevity, we use the abbreviation "pc" for "placeholder
|
|
// container" in variables below.
|
|
WritingMode pcWM = aPlaceholderContainer->GetWritingMode();
|
|
|
|
// Find what axis aAbsPosCBAxis corresponds to, in placeholder's parent's
|
|
// writing-mode.
|
|
LogicalAxis pcAxis =
|
|
(pcWM.IsOrthogonalTo(aAbsPosCBWM) ? GetOrthogonalAxis(aAbsPosCBAxis)
|
|
: aAbsPosCBAxis);
|
|
|
|
const bool placeholderContainerIsContainingBlock =
|
|
aPlaceholderContainer == aKidReflowInput.mCBReflowInput->mFrame;
|
|
|
|
LayoutFrameType parentType = aPlaceholderContainer->Type();
|
|
LogicalSize alignAreaSize(pcWM);
|
|
if (parentType == LayoutFrameType::FlexContainer) {
|
|
// We store the frame rect in FinishAndStoreOverflow, which runs _after_
|
|
// reflowing the absolute frames, so handle the special case of the frame
|
|
// being the actual containing block here, by getting the size from
|
|
// aAbsPosCBSize.
|
|
//
|
|
// The alignment container is the flex container's content box.
|
|
if (placeholderContainerIsContainingBlock) {
|
|
alignAreaSize = aAbsPosCBSize.ConvertTo(pcWM, aAbsPosCBWM);
|
|
// aAbsPosCBSize is the padding-box, so substract the padding to get the
|
|
// content box.
|
|
alignAreaSize -=
|
|
aPlaceholderContainer->GetLogicalUsedPadding(pcWM).Size(pcWM);
|
|
} else {
|
|
alignAreaSize = aPlaceholderContainer->GetLogicalSize(pcWM);
|
|
LogicalMargin pcBorderPadding =
|
|
aPlaceholderContainer->GetLogicalUsedBorderAndPadding(pcWM);
|
|
alignAreaSize -= pcBorderPadding.Size(pcWM);
|
|
}
|
|
} else if (parentType == LayoutFrameType::GridContainer) {
|
|
// This abspos elem's parent is a grid container. Per CSS Grid 10.1 & 10.2:
|
|
// - If the grid container *also* generates the abspos containing block (a
|
|
// grid area) for this abspos child, we use that abspos containing block as
|
|
// the alignment container, too. (And its size is aAbsPosCBSize.)
|
|
// - Otherwise, we use the grid's padding box as the alignment container.
|
|
// https://drafts.csswg.org/css-grid/#static-position
|
|
if (placeholderContainerIsContainingBlock) {
|
|
// The alignment container is the grid area that we're using as the
|
|
// absolute containing block.
|
|
alignAreaSize = aAbsPosCBSize.ConvertTo(pcWM, aAbsPosCBWM);
|
|
} else {
|
|
// The alignment container is a the grid container's padding box (which
|
|
// we can get by subtracting away its border from frame's size):
|
|
alignAreaSize = aPlaceholderContainer->GetLogicalSize(pcWM);
|
|
LogicalMargin pcBorder =
|
|
aPlaceholderContainer->GetLogicalUsedBorder(pcWM);
|
|
alignAreaSize -= pcBorder.Size(pcWM);
|
|
}
|
|
} else {
|
|
NS_ERROR("Unsupported container for abpsos CSS Box Alignment");
|
|
return 0; // (leave the child at the start of its alignment container)
|
|
}
|
|
|
|
nscoord alignAreaSizeInAxis = (pcAxis == eLogicalAxisInline)
|
|
? alignAreaSize.ISize(pcWM)
|
|
: alignAreaSize.BSize(pcWM);
|
|
|
|
AlignJustifyFlags flags = AlignJustifyFlags::IgnoreAutoMargins;
|
|
StyleAlignFlags alignConst =
|
|
aPlaceholderContainer->CSSAlignmentForAbsPosChild(aKidReflowInput,
|
|
pcAxis);
|
|
// If the safe bit in alignConst is set, set the safe flag in |flags|.
|
|
// Note: If no <overflow-position> is specified, we behave as 'unsafe'.
|
|
// This doesn't quite match the css-align spec, which has an [at-risk]
|
|
// "smart default" behavior with some extra nuance about scroll containers.
|
|
if (alignConst & StyleAlignFlags::SAFE) {
|
|
flags |= AlignJustifyFlags::OverflowSafe;
|
|
}
|
|
alignConst &= ~StyleAlignFlags::FLAG_BITS;
|
|
|
|
// Find out if placeholder-container & the OOF child have the same start-sides
|
|
// in the placeholder-container's pcAxis.
|
|
WritingMode kidWM = aKidReflowInput.GetWritingMode();
|
|
if (pcWM.ParallelAxisStartsOnSameSide(pcAxis, kidWM)) {
|
|
flags |= AlignJustifyFlags::SameSide;
|
|
}
|
|
|
|
// (baselineAdjust is unused. CSSAlignmentForAbsPosChild() should've
|
|
// converted 'baseline'/'last baseline' enums to their fallback values.)
|
|
const nscoord baselineAdjust = nscoord(0);
|
|
|
|
// AlignJustifySelf operates in the kid's writing mode, so we need to
|
|
// represent the child's size and the desired axis in that writing mode:
|
|
LogicalSize kidSizeInOwnWM =
|
|
aKidSizeInAbsPosCBWM.ConvertTo(kidWM, aAbsPosCBWM);
|
|
LogicalAxis kidAxis =
|
|
(kidWM.IsOrthogonalTo(aAbsPosCBWM) ? GetOrthogonalAxis(aAbsPosCBAxis)
|
|
: aAbsPosCBAxis);
|
|
|
|
nscoord offset = CSSAlignUtils::AlignJustifySelf(
|
|
alignConst, kidAxis, flags, baselineAdjust, alignAreaSizeInAxis,
|
|
aKidReflowInput, kidSizeInOwnWM);
|
|
|
|
// "offset" is in terms of the CSS Box Alignment container (i.e. it's in
|
|
// terms of pcWM). But our return value needs to in terms of the containing
|
|
// block's writing mode, which might have the opposite directionality in the
|
|
// given axis. In that case, we just need to negate "offset" when returning,
|
|
// to make it have the right effect as an offset for coordinates in the
|
|
// containing block's writing mode.
|
|
if (!pcWM.ParallelAxisStartsOnSameSide(pcAxis, aAbsPosCBWM)) {
|
|
return -offset;
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
void nsAbsoluteContainingBlock::ResolveSizeDependentOffsets(
|
|
nsPresContext* aPresContext, ReflowInput& aKidReflowInput,
|
|
const LogicalSize& aKidSize, const LogicalMargin& aMargin,
|
|
LogicalMargin* aOffsets, LogicalSize* aLogicalCBSize) {
|
|
WritingMode wm = aKidReflowInput.GetWritingMode();
|
|
WritingMode outerWM = aKidReflowInput.mParentReflowInput->GetWritingMode();
|
|
|
|
// Now that we know the child's size, we resolve any sentinel values in its
|
|
// IStart/BStart offset coordinates that depend on that size.
|
|
// * NS_AUTOOFFSET indicates that the child's position in the given axis
|
|
// is determined by its end-wards offset property, combined with its size and
|
|
// available space. e.g.: "top: auto; height: auto; bottom: 50px"
|
|
// * m{I,B}OffsetsResolvedAfterSize indicate that the child is using its
|
|
// static position in that axis, *and* its static position is determined by
|
|
// the axis-appropriate css-align property (which may require the child's
|
|
// size, e.g. to center it within the parent).
|
|
if ((NS_AUTOOFFSET == aOffsets->IStart(outerWM)) ||
|
|
(NS_AUTOOFFSET == aOffsets->BStart(outerWM)) ||
|
|
aKidReflowInput.mFlags.mIOffsetsNeedCSSAlign ||
|
|
aKidReflowInput.mFlags.mBOffsetsNeedCSSAlign) {
|
|
if (-1 == aLogicalCBSize->ISize(wm)) {
|
|
// Get the containing block width/height
|
|
const ReflowInput* parentRI = aKidReflowInput.mParentReflowInput;
|
|
*aLogicalCBSize = aKidReflowInput.ComputeContainingBlockRectangle(
|
|
aPresContext, parentRI);
|
|
}
|
|
|
|
const LogicalSize logicalCBSizeOuterWM =
|
|
aLogicalCBSize->ConvertTo(outerWM, wm);
|
|
|
|
// placeholderContainer is used in each of the m{I,B}OffsetsNeedCSSAlign
|
|
// clauses. We declare it at this scope so we can avoid having to look
|
|
// it up twice (and only look it up if it's needed).
|
|
nsContainerFrame* placeholderContainer = nullptr;
|
|
|
|
if (NS_AUTOOFFSET == aOffsets->IStart(outerWM)) {
|
|
NS_ASSERTION(NS_AUTOOFFSET != aOffsets->IEnd(outerWM),
|
|
"Can't solve for both start and end");
|
|
aOffsets->IStart(outerWM) =
|
|
logicalCBSizeOuterWM.ISize(outerWM) - aOffsets->IEnd(outerWM) -
|
|
aMargin.IStartEnd(outerWM) - aKidSize.ISize(outerWM);
|
|
} else if (aKidReflowInput.mFlags.mIOffsetsNeedCSSAlign) {
|
|
placeholderContainer = GetPlaceholderContainer(aKidReflowInput.mFrame);
|
|
nscoord offset = OffsetToAlignedStaticPos(
|
|
aKidReflowInput, aKidSize, logicalCBSizeOuterWM, placeholderContainer,
|
|
outerWM, eLogicalAxisInline);
|
|
// Shift IStart from its current position (at start corner of the
|
|
// alignment container) by the returned offset. And set IEnd to the
|
|
// distance between the kid's end edge to containing block's end edge.
|
|
aOffsets->IStart(outerWM) += offset;
|
|
aOffsets->IEnd(outerWM) =
|
|
logicalCBSizeOuterWM.ISize(outerWM) -
|
|
(aOffsets->IStart(outerWM) + aKidSize.ISize(outerWM));
|
|
}
|
|
|
|
if (NS_AUTOOFFSET == aOffsets->BStart(outerWM)) {
|
|
aOffsets->BStart(outerWM) =
|
|
logicalCBSizeOuterWM.BSize(outerWM) - aOffsets->BEnd(outerWM) -
|
|
aMargin.BStartEnd(outerWM) - aKidSize.BSize(outerWM);
|
|
} else if (aKidReflowInput.mFlags.mBOffsetsNeedCSSAlign) {
|
|
if (!placeholderContainer) {
|
|
placeholderContainer = GetPlaceholderContainer(aKidReflowInput.mFrame);
|
|
}
|
|
nscoord offset = OffsetToAlignedStaticPos(
|
|
aKidReflowInput, aKidSize, logicalCBSizeOuterWM, placeholderContainer,
|
|
outerWM, eLogicalAxisBlock);
|
|
// Shift BStart from its current position (at start corner of the
|
|
// alignment container) by the returned offset. And set BEnd to the
|
|
// distance between the kid's end edge to containing block's end edge.
|
|
aOffsets->BStart(outerWM) += offset;
|
|
aOffsets->BEnd(outerWM) =
|
|
logicalCBSizeOuterWM.BSize(outerWM) -
|
|
(aOffsets->BStart(outerWM) + aKidSize.BSize(outerWM));
|
|
}
|
|
aKidReflowInput.SetComputedLogicalOffsets(aOffsets->ConvertTo(wm, outerWM));
|
|
}
|
|
}
|
|
|
|
// 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
|
|
// mChildListID == kFixedList, the height is unconstrained.
|
|
// since we don't allow replicated frames to split.
|
|
|
|
void nsAbsoluteContainingBlock::ReflowAbsoluteFrame(
|
|
nsIFrame* aDelegatingFrame, nsPresContext* aPresContext,
|
|
const ReflowInput& aReflowInput, const nsRect& aContainingBlock,
|
|
AbsPosReflowFlags aFlags, nsIFrame* aKidFrame, nsReflowStatus& aStatus,
|
|
nsOverflowAreas* aOverflowAreas) {
|
|
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
|
|
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
printf("abs pos ");
|
|
nsAutoString name;
|
|
aKidFrame->GetFrameName(name);
|
|
printf("%s ", NS_LossyConvertUTF16toASCII(name).get());
|
|
|
|
char width[16];
|
|
char height[16];
|
|
PrettyUC(aReflowInput.AvailableWidth(), width, 16);
|
|
PrettyUC(aReflowInput.AvailableHeight(), height, 16);
|
|
printf(" a=%s,%s ", width, height);
|
|
PrettyUC(aReflowInput.ComputedWidth(), width, 16);
|
|
PrettyUC(aReflowInput.ComputedHeight(), height, 16);
|
|
printf("c=%s,%s \n", width, height);
|
|
}
|
|
AutoNoisyIndenter indent(nsBlockFrame::gNoisy);
|
|
#endif // DEBUG
|
|
|
|
WritingMode wm = aKidFrame->GetWritingMode();
|
|
LogicalSize logicalCBSize(wm, aContainingBlock.Size());
|
|
nscoord availISize = logicalCBSize.ISize(wm);
|
|
if (availISize == -1) {
|
|
NS_ASSERTION(
|
|
aReflowInput.ComputedSize(wm).ISize(wm) != NS_UNCONSTRAINEDSIZE,
|
|
"Must have a useful inline-size _somewhere_");
|
|
availISize = aReflowInput.ComputedSizeWithPadding(wm).ISize(wm);
|
|
}
|
|
|
|
uint32_t rsFlags = 0;
|
|
if (aFlags & AbsPosReflowFlags::IsGridContainerCB) {
|
|
// When a grid container generates the abs.pos. CB for a *child* then
|
|
// the static position is determined via CSS Box Alignment within the
|
|
// abs.pos. CB (a grid area, i.e. a piece of the grid). In this scenario,
|
|
// due to the multiple coordinate spaces in play, we use a convenience flag
|
|
// to simply have the child's ReflowInput give it a static position at its
|
|
// abs.pos. CB origin, and then we'll align & offset it from there.
|
|
nsIFrame* placeholder = aKidFrame->GetPlaceholderFrame();
|
|
if (placeholder && placeholder->GetParent() == aDelegatingFrame) {
|
|
rsFlags |= ReflowInput::STATIC_POS_IS_CB_ORIGIN;
|
|
}
|
|
}
|
|
ReflowInput kidReflowInput(aPresContext, aReflowInput, aKidFrame,
|
|
LogicalSize(wm, availISize, NS_UNCONSTRAINEDSIZE),
|
|
Some(logicalCBSize), rsFlags);
|
|
|
|
// Get the border values
|
|
WritingMode outerWM = aReflowInput.GetWritingMode();
|
|
const LogicalMargin border(outerWM, aDelegatingFrame->GetUsedBorder());
|
|
|
|
LogicalMargin margin =
|
|
kidReflowInput.ComputedLogicalMargin().ConvertTo(outerWM, wm);
|
|
|
|
// If we're doing CSS Box Alignment in either axis, that will apply the
|
|
// margin for us in that axis (since the thing that's aligned is the margin
|
|
// box). So, we clear out the margin here to avoid applying it twice.
|
|
if (kidReflowInput.mFlags.mIOffsetsNeedCSSAlign) {
|
|
margin.IStart(outerWM) = margin.IEnd(outerWM) = 0;
|
|
}
|
|
if (kidReflowInput.mFlags.mBOffsetsNeedCSSAlign) {
|
|
margin.BStart(outerWM) = margin.BEnd(outerWM) = 0;
|
|
}
|
|
|
|
bool constrainBSize =
|
|
(aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE) &&
|
|
|
|
// Don't split if told not to (e.g. for fixed frames)
|
|
(aFlags & AbsPosReflowFlags::ConstrainHeight) &&
|
|
|
|
// XXX we don't handle splitting frames for inline absolute containing
|
|
// blocks yet
|
|
!aDelegatingFrame->IsInlineFrame() &&
|
|
|
|
// Bug 1588623: Support splitting absolute positioned multicol containers.
|
|
!aKidFrame->IsColumnSetWrapperFrame() &&
|
|
|
|
// 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.
|
|
(aKidFrame->GetLogicalRect(aContainingBlock.Size()).BStart(wm) <=
|
|
aReflowInput.AvailableBSize());
|
|
|
|
if (constrainBSize) {
|
|
kidReflowInput.AvailableBSize() =
|
|
aReflowInput.AvailableBSize() -
|
|
border.ConvertTo(wm, outerWM).BStart(wm) -
|
|
kidReflowInput.ComputedLogicalMargin().BStart(wm);
|
|
if (NS_AUTOOFFSET != kidReflowInput.ComputedLogicalOffsets().BStart(wm)) {
|
|
kidReflowInput.AvailableBSize() -=
|
|
kidReflowInput.ComputedLogicalOffsets().BStart(wm);
|
|
}
|
|
}
|
|
|
|
// Do the reflow
|
|
ReflowOutput kidDesiredSize(kidReflowInput);
|
|
aKidFrame->Reflow(aPresContext, kidDesiredSize, kidReflowInput, aStatus);
|
|
|
|
const LogicalSize kidSize = kidDesiredSize.Size(wm).ConvertTo(outerWM, wm);
|
|
|
|
LogicalMargin offsets =
|
|
kidReflowInput.ComputedLogicalOffsets().ConvertTo(outerWM, wm);
|
|
|
|
// If we're solving for start in either inline or block direction,
|
|
// then compute it now that we know the dimensions.
|
|
ResolveSizeDependentOffsets(aPresContext, kidReflowInput, kidSize, margin,
|
|
&offsets, &logicalCBSize);
|
|
|
|
// 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.
|
|
r.x += aContainingBlock.x;
|
|
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, &kidReflowInput);
|
|
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyReflow) {
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent - 1);
|
|
printf("abs pos ");
|
|
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());
|
|
}
|
|
}
|