/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ /* * rendering object for CSS display:block, inline-block, and list-item * boxes, also used for various anonymous boxes */ #ifndef nsBlockFrame_h___ #define nsBlockFrame_h___ #include "nsContainerFrame.h" #include "nsHTMLParts.h" #include "nsLineBox.h" #include "nsCSSPseudoElements.h" #include "nsFloatManager.h" enum class LineReflowStatus { // The line was completely reflowed and fit in available width, and we should // try to pull up content from the next line if possible. OK, // The line was completely reflowed and fit in available width, but we should // not try to pull up content from the next line. Stop, // We need to reflow the line again at its current vertical position. The // new reflow should not try to pull up any frames from the next line. RedoNoPull, // We need to reflow the line again using the floats from its height // this reflow, since its height made it hit floats that were not // adjacent to its top. RedoMoreFloats, // We need to reflow the line again at a lower vertical postion where there // may be more horizontal space due to different float configuration. RedoNextBand, // The line did not fit in the available vertical space. Try pushing it to // the next page or column if it's not the first line on the current // page/column. Truncated }; class nsBlockInFlowLineIterator; class nsBulletFrame; namespace mozilla { class BlockReflowInput; class ServoRestyleState; class ServoStyleSet; } // namespace mozilla /** * Some invariants: * -- The overflow out-of-flows list contains the out-of- * flow frames whose placeholders are in the overflow list. * -- A given piece of content has at most one placeholder * frame in a block's normal child list. * -- While a block is being reflowed, and from then until * its next-in-flow is reflowed it may have a * PushedFloatProperty frame property that points to * an nsFrameList. This list contains continuations for * floats whose prev-in-flow is in the block's regular float * list and first-in-flows of floats that did not fit, but * whose placeholders are in the block or one of its * prev-in-flows. * -- In all these frame lists, if there are two frames for * the same content appearing in the list, then the frames * appear with the prev-in-flow before the next-in-flow. * -- While reflowing a block, its overflow line list * will usually be empty but in some cases will have lines * (while we reflow the block at its shrink-wrap width). * In this case any new overflowing content must be * prepended to the overflow lines. */ /* * Base class for block and inline frames. * The block frame has an additional child list, kAbsoluteList, which * contains the absolutely positioned frames. */ class nsBlockFrame : public nsContainerFrame { using BlockReflowInput = mozilla::BlockReflowInput; public: NS_DECL_FRAMEARENA_HELPERS(nsBlockFrame) typedef nsLineList::iterator LineIterator; typedef nsLineList::const_iterator ConstLineIterator; typedef nsLineList::reverse_iterator ReverseLineIterator; typedef nsLineList::const_reverse_iterator ConstReverseLineIterator; LineIterator LinesBegin() { return mLines.begin(); } LineIterator LinesEnd() { return mLines.end(); } ConstLineIterator LinesBegin() const { return mLines.begin(); } ConstLineIterator LinesEnd() const { return mLines.end(); } ReverseLineIterator LinesRBegin() { return mLines.rbegin(); } ReverseLineIterator LinesREnd() { return mLines.rend(); } ConstReverseLineIterator LinesRBegin() const { return mLines.rbegin(); } ConstReverseLineIterator LinesREnd() const { return mLines.rend(); } LineIterator LinesBeginFrom(nsLineBox* aList) { return mLines.begin(aList); } ReverseLineIterator LinesRBeginFrom(nsLineBox* aList) { return mLines.rbegin(aList); } friend nsBlockFrame* NS_NewBlockFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle); // nsQueryFrame NS_DECL_QUERYFRAME // nsIFrame void Init(nsIContent* aContent, nsContainerFrame* aParent, nsIFrame* aPrevInFlow) override; void SetInitialChildList(ChildListID aListID, nsFrameList& aChildList) override; void AppendFrames(ChildListID aListID, nsFrameList& aFrameList) override; void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame, nsFrameList& aFrameList) override; void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) override; const nsFrameList& GetChildList(ChildListID aListID) const override; void GetChildLists(nsTArray* aLists) const override; nscoord GetLogicalBaseline(mozilla::WritingMode aWritingMode) const override; bool GetVerticalAlignBaseline(mozilla::WritingMode aWM, nscoord* aBaseline) const override { NS_ASSERTION(!aWM.IsOrthogonalTo(GetWritingMode()), "You should only call this on frames with a WM that's " "parallel to aWM"); nscoord lastBaseline; if (GetNaturalBaselineBOffset(aWM, BaselineSharingGroup::eLast, &lastBaseline)) { *aBaseline = BSize() - lastBaseline; return true; } return false; } bool GetNaturalBaselineBOffset(mozilla::WritingMode aWM, BaselineSharingGroup aBaselineGroup, nscoord* aBaseline) const override; nscoord GetCaretBaseline() const override; void DestroyFrom(nsIFrame* aDestructRoot, PostDestroyData& aPostDestroyData) override; bool IsFloatContainingBlock() const override; void BuildDisplayList(nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists) override; bool IsFrameOfType(uint32_t aFlags) const override { return nsContainerFrame::IsFrameOfType( aFlags & ~(nsIFrame::eCanContainOverflowContainers)); } void InvalidateFrame(uint32_t aDisplayItemKey = 0, bool aRebuildDisplayItems = true) override; void InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey = 0, bool aRebuildDisplayItems = true) override; #ifdef DEBUG_FRAME_DUMP void List(FILE* out = stderr, const char* aPrefix = "", uint32_t aFlags = 0) const override; nsresult GetFrameName(nsAString& aResult) const override; #endif #ifdef DEBUG const char* LineReflowStatusToString( LineReflowStatus aLineReflowStatus) const; #endif #ifdef ACCESSIBILITY mozilla::a11y::AccType AccessibleType() override; #endif // Line cursor methods to speed up line searching in which one query // result is expected to be close to the next in general. This is // mainly for searching line(s) containing a point. It is also used // as a cache for local computation. Use AutoLineCursorSetup for the // latter case so that it wouldn't interact unexpectedly with the // former. The basic idea for the former is that we set the cursor // property if the lines' overflowArea.VisualOverflow().ys and // overflowArea.VisualOverflow().yMosts are non-decreasing // (considering only non-empty overflowArea.VisualOverflow()s; empty // overflowArea.VisualOverflow()s never participate in event handling // or painting), and the block has sufficient number of lines. The // cursor property points to a "recently used" line. If we get a // series of requests that work on lines // "near" the cursor, then we can find those nearby lines quickly by // starting our search at the cursor. // Clear out line cursor because we're disturbing the lines (i.e., Reflow) void ClearLineCursor(); // Get the first line that might contain y-coord 'y', or nullptr if you must // search all lines. If nonnull is returned then we guarantee that the lines' // combinedArea.ys and combinedArea.yMosts are non-decreasing. // The actual line returned might not contain 'y', but if not, it is // guaranteed to be before any line which does contain 'y'. nsLineBox* GetFirstLineContaining(nscoord y); // Set the line cursor to our first line. Only call this if you // guarantee that either the lines' combinedArea.ys and combinedArea. // yMosts are non-decreasing, or the line cursor is cleared before // building the display list of this frame. void SetupLineCursor(); /** * Helper RAII class for automatically set and clear line cursor for * temporary use. If the frame already has line cursor, this would be * a no-op. */ class MOZ_STACK_CLASS AutoLineCursorSetup { public: explicit AutoLineCursorSetup(nsBlockFrame* aFrame) : mFrame(aFrame), mOrigCursor(aFrame->GetLineCursor()) { if (!mOrigCursor) { mFrame->SetupLineCursor(); } } ~AutoLineCursorSetup() { if (mOrigCursor) { mFrame->SetProperty(LineCursorProperty(), mOrigCursor); } else { mFrame->ClearLineCursor(); } } private: nsBlockFrame* mFrame; nsLineBox* mOrigCursor; }; void ChildIsDirty(nsIFrame* aChild) override; bool IsEmpty() override; bool CachedIsEmpty() override; bool IsSelfEmpty() override; // Given that we have a bullet, does it actually draw something, i.e., // do we have either a 'list-style-type' or 'list-style-image' that is // not 'none'? bool BulletIsEmpty() const; /** * Return the bullet text equivalent. */ void GetSpokenBulletText(nsAString& aText) const; /** * Return true if there's a bullet. */ bool HasBullet() const { return HasOutsideBullet() || HasInsideBullet(); } /** * @return true if this frame has an inside bullet frame. */ bool HasInsideBullet() const { return 0 != (mState & NS_BLOCK_FRAME_HAS_INSIDE_BULLET); } /** * @return true if this frame has an outside bullet frame. */ bool HasOutsideBullet() const { return 0 != (mState & NS_BLOCK_FRAME_HAS_OUTSIDE_BULLET); } /** * @return the bullet frame or nullptr if we don't have one. */ nsBulletFrame* GetBullet() const { nsBulletFrame* outside = GetOutsideBullet(); return outside ? outside : GetInsideBullet(); } /** * @return the first-letter frame or nullptr if we don't have one. */ nsIFrame* GetFirstLetter() const; /** * @return the ::first-line frame or nullptr if we don't have one. */ nsIFrame* GetFirstLineFrame() const; void MarkIntrinsicISizesDirty() override; private: void CheckIntrinsicCacheAgainstShrinkWrapState(); public: nscoord GetMinISize(gfxContext* aRenderingContext) override; nscoord GetPrefISize(gfxContext* aRenderingContext) override; nsRect ComputeTightBounds(DrawTarget* aDrawTarget) const override; nsresult GetPrefWidthTightBounds(gfxContext* aContext, nscoord* aX, nscoord* aXMost) override; /** * Compute the final block size of this frame. * * @param aReflowInput Data structure passed from parent during reflow. * @param aReflowStatus A pointer to the reflow status for when we're finished * doing reflow. this will get set appropriately if the block-size * causes us to exceed the current available (page) block-size. * @param aContentBSize The block-size of content, precomputed outside of this * function. The final block-size that is used in aMetrics will be set * to either this or the available block-size, whichever is larger, in * the case where our available block-size is constrained, and we * overflow that available block-size. * @param aBorderPadding The margins representing the border padding for block * frames. Can be 0. * @param aFinalSize Out parameter for final block-size. * @param aConsumed The block-size already consumed by our previous-in-flows. */ void ComputeFinalBSize(const ReflowInput& aReflowInput, nsReflowStatus* aStatus, nscoord aContentBSize, const mozilla::LogicalMargin& aBorderPadding, mozilla::LogicalSize& aFinalSize, nscoord aConsumed); void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize, const ReflowInput& aReflowInput, nsReflowStatus& aStatus) override; nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute, int32_t aModType) override; /** * Move any frames on our overflow list to the end of our principal list. * @return true if there were any overflow frames */ bool DrainSelfOverflowList() override; nsresult StealFrame(nsIFrame* aChild) override; void DeleteNextInFlowChild(nsIFrame* aNextInFlow, bool aDeletingEmptyFrames) override; /** * This is a special method that allows a child class of nsBlockFrame to * return a special, customized nsStyleText object to the nsLineLayout * constructor. It is used when the nsBlockFrame child needs to specify its * custom rendering style. */ virtual const nsStyleText* StyleTextForLineLayout(); /** * Determines whether the collapsed margin carried out of the last * line includes the margin-top of a line with clearance (in which * case we must avoid collapsing that margin with our bottom margin) */ bool CheckForCollapsedBEndMarginFromClearanceLine(); static nsresult GetCurrentLine(BlockReflowInput* aState, nsLineBox** aOutCurrentLine); /** * Determine if this block is a margin root at the top/bottom edges. */ void IsMarginRoot(bool* aBStartMarginRoot, bool* aBEndMarginRoot); static bool BlockNeedsFloatManager(nsIFrame* aBlock); /** * Returns whether aFrame is a block frame that will wrap its contents * around floats intruding on it from the outside. (aFrame need not * be a block frame, but if it's not, the result will be false.) */ static bool BlockCanIntersectFloats(nsIFrame* aFrame); /** * Returns the inline size that needs to be cleared past floats for * blocks that cannot intersect floats. aState must already have * GetAvailableSpace called on it for the block-dir position that we * care about (which need not be its current mBCoord) */ struct ReplacedElementISizeToClear { // Note that we care about the inline-start margin but can ignore // the inline-end margin. nscoord marginIStart, borderBoxISize; }; static ReplacedElementISizeToClear ISizeToClearPastFloats( const BlockReflowInput& aState, const mozilla::LogicalRect& aFloatAvailableSpace, nsIFrame* aFrame); /** * Creates a contination for aFloat and adds it to the list of overflow * floats. Also updates aState.mReflowStatus to include the float's * incompleteness. Must only be called while this block frame is in reflow. * aFloatStatus must be the float's true, unmodified reflow status. */ void SplitFloat(BlockReflowInput& aState, nsIFrame* aFloat, const nsReflowStatus& aFloatStatus); /** * Walks up the frame tree, starting with aCandidate, and returns the first * block frame that it encounters. */ static nsBlockFrame* GetNearestAncestorBlock(nsIFrame* aCandidate); struct FrameLines { nsLineList mLines; nsFrameList mFrames; }; /** * Update the styles of our various pseudo-elements (bullets, first-line, * etc, but _not_ first-letter). */ void UpdatePseudoElementStyles(mozilla::ServoRestyleState& aRestyleState); // Update our first-letter styles during stylo post-traversal. This needs to // be done at a slightly different time than our other pseudo-elements. void UpdateFirstLetterStyle(mozilla::ServoRestyleState& aRestyleState); protected: explicit nsBlockFrame(ComputedStyle* aStyle, nsPresContext* aPresContext, ClassID aID = kClassID) : nsContainerFrame(aStyle, aPresContext, aID), mMinWidth(NS_INTRINSIC_WIDTH_UNKNOWN), mPrefWidth(NS_INTRINSIC_WIDTH_UNKNOWN) { #ifdef DEBUG InitDebugFlags(); #endif } virtual ~nsBlockFrame(); #ifdef DEBUG already_AddRefed GetFirstLetterStyle( nsPresContext* aPresContext); #endif NS_DECLARE_FRAME_PROPERTY_WITHOUT_DTOR(LineCursorProperty, nsLineBox) bool HasLineCursor() { return GetStateBits() & NS_BLOCK_HAS_LINE_CURSOR; } nsLineBox* GetLineCursor() { return HasLineCursor() ? GetProperty(LineCursorProperty()) : nullptr; } nsLineBox* NewLineBox(nsIFrame* aFrame, bool aIsBlock) { return NS_NewLineBox(PresShell(), aFrame, aIsBlock); } nsLineBox* NewLineBox(nsLineBox* aFromLine, nsIFrame* aFrame, int32_t aCount) { return NS_NewLineBox(PresShell(), aFromLine, aFrame, aCount); } void FreeLineBox(nsLineBox* aLine) { if (aLine == GetLineCursor()) { ClearLineCursor(); } aLine->Destroy(PresShell()); } /** * Helper method for StealFrame. */ void RemoveFrameFromLine(nsIFrame* aChild, nsLineList::iterator aLine, nsFrameList& aFrameList, nsLineList& aLineList); void TryAllLines(nsLineList::iterator* aIterator, nsLineList::iterator* aStartIterator, nsLineList::iterator* aEndIterator, bool* aInOverflowLines, FrameLines** aOverflowLines); /** move the frames contained by aLine by aDeltaBCoord * if aLine is a block, its child floats are added to the state manager */ void SlideLine(BlockReflowInput& aState, nsLineBox* aLine, nscoord aDeltaBCoord); void UpdateLineContainerSize(nsLineBox* aLine, const nsSize& aNewContainerSize); // helper for SlideLine and UpdateLineContainerSize void MoveChildFramesOfLine(nsLineBox* aLine, nscoord aDeltaBCoord); void ComputeFinalSize(const ReflowInput& aReflowInput, BlockReflowInput& aState, ReflowOutput& aMetrics, nscoord* aBottomEdgeOfChildren); void ComputeOverflowAreas(const nsRect& aBounds, const nsStyleDisplay* aDisplay, nscoord aBottomEdgeOfChildren, nsOverflowAreas& aOverflowAreas); /** * Add the frames in aFrameList to this block after aPrevSibling. * This block thinks in terms of lines, but the frame construction code * knows nothing about lines at all so we need to find the line that * contains aPrevSibling and add aFrameList after aPrevSibling on that line. * New lines are created as necessary to handle block data in aFrameList. * This function will clear aFrameList. */ void AddFrames(nsFrameList& aFrameList, nsIFrame* aPrevSibling); /** * Perform Bidi resolution on this frame */ nsresult ResolveBidi(); /** * Test whether the frame is a form control in a visual Bidi page. * This is necessary for backwards-compatibility, because most visual * pages use logical order for form controls so that they will * display correctly on native widgets in OSs with Bidi support * @param aPresContext the pres context * @return whether the frame is a BIDI form control */ bool IsVisualFormControl(nsPresContext* aPresContext); public: /** * Helper function to create bullet frame. */ void CreateBulletFrameForListItem(); /** * Does all the real work for removing aDeletedFrame * -- finds the line containing aDeletedFrame * -- removes all aDeletedFrame next-in-flows (or all continuations, * if REMOVE_FIXED_CONTINUATIONS is given) * -- marks lines dirty as needed * -- marks textruns dirty (unless FRAMES_ARE_EMPTY is given, in which * case textruns do not need to be dirtied) * -- destroys all removed frames */ enum { REMOVE_FIXED_CONTINUATIONS = 0x02, FRAMES_ARE_EMPTY = 0x04 }; void DoRemoveFrame(nsIFrame* aDeletedFrame, uint32_t aFlags) { AutoPostDestroyData data(PresContext()); DoRemoveFrameInternal(aDeletedFrame, aFlags, data.mData); } void ReparentFloats(nsIFrame* aFirstFrame, nsBlockFrame* aOldParent, bool aReparentSiblings, ReparentingDirection aDirection); virtual bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override; virtual void UnionChildOverflow(nsOverflowAreas& aOverflowAreas) override; /** * Load all of aFrame's floats into the float manager iff aFrame is not a * block formatting context. Handles all necessary float manager translations; * assumes float manager is in aFrame's parent's coord system. * * Safe to call on non-blocks (does nothing). */ static void RecoverFloatsFor(nsIFrame* aFrame, nsFloatManager& aFloatManager, mozilla::WritingMode aWM, const nsSize& aContainerSize); /** * Determine if we have any pushed floats from a previous continuation. * * @returns true, if any of the floats at the beginning of our mFloats list * have the NS_FRAME_IS_PUSHED_FLOAT bit set; false otherwise. */ bool HasPushedFloatsFromPrevContinuation() const { if (!mFloats.IsEmpty()) { // If we have pushed floats, then they should be at the beginning of our // float list. if (mFloats.FirstChild()->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT) { return true; } } #ifdef DEBUG // Double-check the above assertion that pushed floats should be at the // beginning of our floats list. for (nsFrameList::Enumerator e(mFloats); !e.AtEnd(); e.Next()) { nsIFrame* f = e.get(); NS_ASSERTION(!(f->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT), "pushed floats must be at the beginning of the float list"); } #endif // We may have a pending push of pushed floats too: if (HasPushedFloats()) { // XXX we can return 'true' here once we make HasPushedFloats // not lie. (see nsBlockFrame::RemoveFloat) auto* pushedFloats = GetPushedFloats(); return pushedFloats && !pushedFloats->IsEmpty(); } return false; } virtual bool RenumberChildFrames(int32_t* aOrdinal, int32_t aDepth, int32_t aIncrement, bool aForCounting) override; // @see nsIFrame::AddSizeOfExcludingThisForTree void AddSizeOfExcludingThisForTree(nsWindowSizes&) const override; protected: /** @see DoRemoveFrame */ void DoRemoveFrameInternal(nsIFrame* aDeletedFrame, uint32_t aFlags, PostDestroyData& data); /** grab overflow lines from this block's prevInFlow, and make them * part of this block's mLines list. * @return true if any lines were drained. */ bool DrainOverflowLines(); /** * @return false iff this block does not have a float on any child list. * This function is O(1). */ bool MaybeHasFloats() const { if (!mFloats.IsEmpty()) { return true; } // XXX this could be replaced with HasPushedFloats() if we enforced // removing the property when the frame list becomes empty. nsFrameList* list = GetPushedFloats(); if (list && !list->IsEmpty()) { return true; } // For the OverflowOutOfFlowsProperty I think we do enforce that, but it's // a mix of out-of-flow frames, so that's why the method name has "Maybe". return GetStateBits() & NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS; } /** * Moves frames from our PushedFloats list back into our mFloats list. */ void DrainSelfPushedFloats(); /** * First calls DrainSelfPushedFloats() then grabs pushed floats from this * block's prev-in-flow, and splice them into this block's mFloats list too. */ void DrainPushedFloats(); /** Load all our floats into the float manager (without reflowing them). * Assumes float manager is in our own coordinate system. */ void RecoverFloats(nsFloatManager& aFloatManager, mozilla::WritingMode aWM, const nsSize& aContainerSize); /** Reflow pushed floats */ void ReflowPushedFloats(BlockReflowInput& aState, nsOverflowAreas& aOverflowAreas, nsReflowStatus& aStatus); /** Find any trailing BR clear from the last line of the block (or its PIFs) */ mozilla::StyleClear FindTrailingClear(); /** * Remove a float from our float list. */ void RemoveFloat(nsIFrame* aFloat); /** * Remove a float from the float cache for the line its placeholder is on. */ void RemoveFloatFromFloatCache(nsIFrame* aFloat); void CollectFloats(nsIFrame* aFrame, nsFrameList& aList, bool aCollectFromSiblings) { if (MaybeHasFloats()) { DoCollectFloats(aFrame, aList, aCollectFromSiblings); } } void DoCollectFloats(nsIFrame* aFrame, nsFrameList& aList, bool aCollectFromSiblings); // Remove a float, abs, rel positioned frame from the appropriate block's list static void DoRemoveOutOfFlowFrame(nsIFrame* aFrame); /** set up the conditions necessary for an resize reflow * the primary task is to mark the minimumly sufficient lines dirty. */ void PrepareResizeReflow(BlockReflowInput& aState); /** reflow all lines that have been marked dirty */ void ReflowDirtyLines(BlockReflowInput& aState); /** Mark a given line dirty due to reflow being interrupted on or before it */ void MarkLineDirtyForInterrupt(nsLineBox* aLine); //---------------------------------------- // Methods for line reflow /** * Reflow a line. * * @param aState * the current reflow state * @param aLine * the line to reflow. can contain a single block frame or contain 1 or * more inline frames. * @param aKeepReflowGoing [OUT] * indicates whether the caller should continue to reflow more lines */ void ReflowLine(BlockReflowInput& aState, LineIterator aLine, bool* aKeepReflowGoing); // Return false if it needs another reflow because of reduced space // between floats that are next to it (but not next to its top), and // return true otherwise. bool PlaceLine(BlockReflowInput& aState, nsLineLayout& aLineLayout, LineIterator aLine, nsFloatManager::SavedState* aFloatStateBeforeLine, nsFlowAreaRect& aFlowArea, // in-out nscoord& aAvailableSpaceBSize, // in-out bool* aKeepReflowGoing); /** * If NS_BLOCK_LOOK_FOR_DIRTY_FRAMES is set, call MarkLineDirty * on any line with a child frame that is dirty. */ void LazyMarkLinesDirty(); /** * Mark |aLine| dirty, and, if necessary because of possible * pull-up, mark the previous line dirty as well. Also invalidates textruns * on those lines because the text in the lines might have changed due to * addition/removal of frames. * @param aLine the line to mark dirty * @param aLineList the line list containing that line */ void MarkLineDirty(LineIterator aLine, const nsLineList* aLineList); // XXX where to go bool IsLastLine(BlockReflowInput& aState, LineIterator aLine); void DeleteLine(BlockReflowInput& aState, nsLineList::iterator aLine, nsLineList::iterator aLineEnd); //---------------------------------------- // Methods for individual frame reflow bool ShouldApplyBStartMargin(BlockReflowInput& aState, nsLineBox* aLine, nsIFrame* aChildFrame); void ReflowBlockFrame(BlockReflowInput& aState, LineIterator aLine, bool* aKeepGoing); void ReflowInlineFrames(BlockReflowInput& aState, LineIterator aLine, bool* aKeepLineGoing); void DoReflowInlineFrames( BlockReflowInput& aState, nsLineLayout& aLineLayout, LineIterator aLine, nsFlowAreaRect& aFloatAvailableSpace, nscoord& aAvailableSpaceBSize, nsFloatManager::SavedState* aFloatStateBeforeLine, bool* aKeepReflowGoing, LineReflowStatus* aLineReflowStatus, bool aAllowPullUp); void ReflowInlineFrame(BlockReflowInput& aState, nsLineLayout& aLineLayout, LineIterator aLine, nsIFrame* aFrame, LineReflowStatus* aLineReflowStatus); // Compute the available inline size for a float. mozilla::LogicalRect AdjustFloatAvailableSpace( BlockReflowInput& aState, const mozilla::LogicalRect& aFloatAvailableSpace, nsIFrame* aFloatFrame); // Computes the border-box inline size of the float nscoord ComputeFloatISize(BlockReflowInput& aState, const mozilla::LogicalRect& aFloatAvailableSpace, nsIFrame* aFloat); // An incomplete aReflowStatus indicates the float should be split // but only if the available height is constrained. // aAdjustedAvailableSpace is the result of calling // nsBlockFrame::AdjustFloatAvailableSpace. void ReflowFloat(BlockReflowInput& aState, const mozilla::LogicalRect& aAdjustedAvailableSpace, nsIFrame* aFloat, mozilla::LogicalMargin& aFloatMargin, mozilla::LogicalMargin& aFloatOffsets, // Whether the float's position // (aAdjustedAvailableSpace) has been pushed down // due to the presence of other floats. bool aFloatPushedDown, nsReflowStatus& aReflowStatus); //---------------------------------------- // Methods for pushing/pulling lines/frames /** * Create a next-in-flow, if necessary, for aFrame. If a new frame is * created, place it in aLine if aLine is not null. * @param aState the block reflow state * @param aLine where to put a new frame * @param aFrame the frame * @return true if a new frame was created, false if not */ bool CreateContinuationFor(BlockReflowInput& aState, nsLineBox* aLine, nsIFrame* aFrame); /** * Push aLine (and any after it), since it cannot be placed on this * page/column. Set aKeepReflowGoing to false and set * flag aState.mReflowStatus as incomplete. */ void PushTruncatedLine(BlockReflowInput& aState, LineIterator aLine, bool* aKeepReflowGoing); void SplitLine(BlockReflowInput& aState, nsLineLayout& aLineLayout, LineIterator aLine, nsIFrame* aFrame, LineReflowStatus* aLineReflowStatus); /** * Pull a frame from the next available location (one of our lines or * one of our next-in-flows lines). * @return the pulled frame or nullptr */ nsIFrame* PullFrame(BlockReflowInput& aState, LineIterator aLine); /** * Try to pull a frame out of a line pointed at by aFromLine. * * Note: pulling a frame from a line that is a place-holder frame * doesn't automatically remove the corresponding float from the * line's float array. This happens indirectly: either the line gets * emptied (and destroyed) or the line gets reflowed (because we mark * it dirty) and the code at the top of ReflowLine empties the * array. So eventually, it will be removed, just not right away. * * @return the pulled frame or nullptr */ nsIFrame* PullFrameFrom(nsLineBox* aLine, nsBlockFrame* aFromContainer, nsLineList::iterator aFromLine); /** * Push the line after aLineBefore to the overflow line list. * @param aLineBefore a line in 'mLines' (or LinesBegin() when * pushing the first line) */ void PushLines(BlockReflowInput& aState, nsLineList::iterator aLineBefore); void PropagateFloatDamage(BlockReflowInput& aState, nsLineBox* aLine, nscoord aDeltaBCoord); void CheckFloats(BlockReflowInput& aState); //---------------------------------------- // List handling kludge void ReflowBullet(nsIFrame* aBulletFrame, BlockReflowInput& aState, ReflowOutput& aMetrics, nscoord aLineTop); //---------------------------------------- virtual nsILineIterator* GetLineIterator() override; public: bool HasOverflowLines() const { return 0 != (GetStateBits() & NS_BLOCK_HAS_OVERFLOW_LINES); } FrameLines* GetOverflowLines() const; protected: FrameLines* RemoveOverflowLines(); void SetOverflowLines(FrameLines* aOverflowLines); void DestroyOverflowLines(); /** * This class is useful for efficiently modifying the out of flow * overflow list. It gives the client direct writable access to * the frame list temporarily but ensures that property is only * written back if absolutely necessary. */ struct nsAutoOOFFrameList { nsFrameList mList; explicit nsAutoOOFFrameList(nsBlockFrame* aBlock) : mPropValue(aBlock->GetOverflowOutOfFlows()), mBlock(aBlock) { if (mPropValue) { mList = *mPropValue; } } ~nsAutoOOFFrameList() { mBlock->SetOverflowOutOfFlows(mList, mPropValue); } protected: nsFrameList* const mPropValue; nsBlockFrame* const mBlock; }; friend struct nsAutoOOFFrameList; nsFrameList* GetOverflowOutOfFlows() const; void SetOverflowOutOfFlows(const nsFrameList& aList, nsFrameList* aPropValue); /** * @return the inside bullet frame or nullptr if we don't have one. */ nsBulletFrame* GetInsideBullet() const; /** * @return the outside bullet frame or nullptr if we don't have one. */ nsBulletFrame* GetOutsideBullet() const; /** * @return the outside bullet frame list frame property. */ nsFrameList* GetOutsideBulletList() const; /** * @return true if this frame has pushed floats. */ bool HasPushedFloats() const { return 0 != (GetStateBits() & NS_BLOCK_HAS_PUSHED_FLOATS); } // Get the pushed floats list, which is used for *temporary* storage // of floats during reflow, between when we decide they don't fit in // this block until our next continuation takes them. nsFrameList* GetPushedFloats() const; // Get the pushed floats list, or if there is not currently one, // make a new empty one. nsFrameList* EnsurePushedFloats(); // Remove and return the pushed floats list. nsFrameList* RemovePushedFloats(); // Resolve a ComputedStyle for our bullet frame. aType should be // mozListBullet or mozListNumber. Passing in the style set is an // optimization, because all callsites have it. already_AddRefed ResolveBulletStyle( mozilla::PseudoStyleType aType, mozilla::ServoStyleSet* aStyleSet); #ifdef DEBUG void VerifyLines(bool aFinalCheckOK); void VerifyOverflowSituation(); int32_t GetDepth() const; #endif // FIXME The two variables should go through a renaming refactoring to reflect // the fact that they mean an inline size, not a width. nscoord mMinWidth, mPrefWidth; nsLineList mLines; // List of all floats in this block // XXXmats blocks rarely have floats, make it a frame property nsFrameList mFloats; friend class mozilla::BlockReflowInput; friend class nsBlockInFlowLineIterator; #ifdef DEBUG public: static bool gLamePaintMetrics; static bool gLameReflowMetrics; static bool gNoisy; static bool gNoisyDamageRepair; static bool gNoisyIntrinsic; static bool gNoisyReflow; static bool gReallyNoisyReflow; static bool gNoisyFloatManager; static bool gVerifyLines; static bool gDisableResizeOpt; static int32_t gNoiseIndent; static const char* kReflowCommandType[]; protected: static void InitDebugFlags(); #endif }; #ifdef DEBUG class AutoNoisyIndenter { public: explicit AutoNoisyIndenter(bool aDoIndent) : mIndented(aDoIndent) { if (mIndented) { nsBlockFrame::gNoiseIndent++; } } ~AutoNoisyIndenter() { if (mIndented) { nsBlockFrame::gNoiseIndent--; } } private: bool mIndented; }; #endif /** * Iterates over all lines in the prev-in-flows/next-in-flows of this block. */ class nsBlockInFlowLineIterator { public: typedef nsBlockFrame::LineIterator LineIterator; /** * Set up the iterator to point to aLine which must be a normal line * in aFrame (not an overflow line). */ nsBlockInFlowLineIterator(nsBlockFrame* aFrame, LineIterator aLine); /** * Set up the iterator to point to the first line found starting from * aFrame. Sets aFoundValidLine to false if there is no such line. * After aFoundValidLine has returned false, don't call any methods on this * object again. */ nsBlockInFlowLineIterator(nsBlockFrame* aFrame, bool* aFoundValidLine); /** * Set up the iterator to point to the line that contains aFindFrame (either * directly or indirectly). If aFrame is out of flow, or contained in an * out-of-flow, finds the line containing the out-of-flow's placeholder. If * the frame is not found, sets aFoundValidLine to false. After * aFoundValidLine has returned false, don't call any methods on this * object again. */ nsBlockInFlowLineIterator(nsBlockFrame* aFrame, nsIFrame* aFindFrame, bool* aFoundValidLine); LineIterator GetLine() { return mLine; } bool IsLastLineInList(); nsBlockFrame* GetContainer() { return mFrame; } bool GetInOverflow() { return mLineList != &mFrame->mLines; } /** * Returns the current line list we're iterating, null means * we're iterating |mLines| of the container. */ nsLineList* GetLineList() { return mLineList; } /** * Returns the end-iterator of whatever line list we're in. */ LineIterator End(); /** * Returns false if there are no more lines. After this has returned false, * don't call any methods on this object again. */ bool Next(); /** * Returns false if there are no more lines. After this has returned false, * don't call any methods on this object again. */ bool Prev(); private: friend class nsBlockFrame; friend class nsBidiPresUtils; // XXX nsBlockFrame uses this internally in one place. Try to remove it. // XXX uhm, and nsBidiPresUtils::Resolve too. nsBlockInFlowLineIterator(nsBlockFrame* aFrame, LineIterator aLine, bool aInOverflow); nsBlockFrame* mFrame; LineIterator mLine; nsLineList* mLineList; // the line list mLine is in /** * Moves iterator to next valid line reachable from the current block. * Returns false if there are no valid lines. */ bool FindValidLine(); }; #endif /* nsBlockFrame_h___ */