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Mypal/layout/generic/nsBlockFrame.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=2:
/* 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;
} // 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_QUERYFRAME_TARGET(nsBlockFrame)
NS_DECL_FRAMEARENA_HELPERS
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,
nsStyleContext* aContext);
// nsQueryFrame
NS_DECL_QUERYFRAME
// nsIFrame
virtual void Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) override;
virtual void SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList) override;
virtual void AppendFrames(ChildListID aListID,
nsFrameList& aFrameList) override;
virtual void InsertFrames(ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList) override;
virtual void RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame) override;
virtual const nsFrameList& GetChildList(ChildListID aListID) const override;
virtual void GetChildLists(nsTArray<ChildList>* aLists) const override;
virtual nscoord GetLogicalBaseline(mozilla::WritingMode aWritingMode) const override;
bool GetVerticalAlignBaseline(mozilla::WritingMode aWM,
nscoord* aBaseline) const override
{
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;
virtual nscoord GetCaretBaseline() const override;
virtual void DestroyFrom(nsIFrame* aDestructRoot) override;
virtual nsSplittableType GetSplittableType() const override;
virtual bool IsFloatContainingBlock() const override;
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) override;
virtual nsIAtom* GetType() const override;
virtual bool IsFrameOfType(uint32_t aFlags) const override
{
return nsContainerFrame::IsFrameOfType(aFlags &
~(nsIFrame::eCanContainOverflowContainers |
nsIFrame::eBlockFrame));
}
virtual void InvalidateFrame(uint32_t aDisplayItemKey = 0) override;
virtual void InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey = 0) override;
#ifdef DEBUG_FRAME_DUMP
void List(FILE* out = stderr, const char* aPrefix = "", uint32_t aFlags = 0) const override;
virtual nsresult GetFrameName(nsAString& aResult) const override;
#endif
#ifdef DEBUG
virtual nsFrameState GetDebugStateBits() const override;
const char* LineReflowStatusToString(LineReflowStatus aLineReflowStatus) const;
#endif
#ifdef ACCESSIBILITY
virtual 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;
};
virtual void ChildIsDirty(nsIFrame* aChild) override;
virtual bool IsVisibleInSelection(nsISelection* aSelection) override;
virtual bool IsEmpty() override;
virtual bool CachedIsEmpty() override;
virtual 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();
}
virtual void MarkIntrinsicISizesDirty() override;
private:
void CheckIntrinsicCacheAgainstShrinkWrapState();
public:
virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) override;
virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override;
virtual nsRect ComputeTightBounds(DrawTarget* aDrawTarget) const override;
virtual nsresult GetPrefWidthTightBounds(nsRenderingContext* 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);
virtual void Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) override;
virtual nsresult AttributeChanged(int32_t aNameSpaceID,
nsIAtom* 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
*/
virtual bool DrainSelfOverflowList() override;
virtual nsresult StealFrame(nsIFrame* aChild) override;
virtual 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.
*/
nsresult SplitFloat(BlockReflowInput& aState,
nsIFrame* aFloat,
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;
};
protected:
explicit nsBlockFrame(nsStyleContext* aContext)
: nsContainerFrame(aContext)
, mMinWidth(NS_INTRINSIC_WIDTH_UNKNOWN)
, mPrefWidth(NS_INTRINSIC_WIDTH_UNKNOWN)
{
#ifdef DEBUG
InitDebugFlags();
#endif
}
virtual ~nsBlockFrame();
#ifdef DEBUG
already_AddRefed<nsStyleContext> 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(PresContext()->PresShell(), aFrame, aIsBlock);
}
nsLineBox* NewLineBox(nsLineBox* aFromLine, nsIFrame* aFrame, int32_t aCount) {
return NS_NewLineBox(PresContext()->PresShell(), aFromLine, aFrame, aCount);
}
void FreeLineBox(nsLineBox* aLine) {
if (aLine == GetLineCursor()) {
ClearLineCursor();
}
aLine->Destroy(PresContext()->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);
/**
* Helper function to create bullet frame.
* @param aCreateBulletList true to create bullet list; otherwise number list.
* @param aListStylePositionInside true to put the list position inside;
* otherwise outside.
*/
void CreateBulletFrameForListItem(bool aCreateBulletList,
bool aListStylePositionInside);
public:
/**
* 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);
void ReparentFloats(nsIFrame* aFirstFrame, nsBlockFrame* aOldParent,
bool aReparentSiblings);
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
return false;
}
virtual bool RenumberChildFrames(int32_t* aOrdinal,
int32_t aDepth,
int32_t aIncrement,
bool aForCounting) override;
protected:
/** 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,
mozilla::LogicalRect& aFloatAvailableSpace, //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();
#ifdef DEBUG
void VerifyLines(bool aFinalCheckOK);
void VerifyOverflowSituation();
int32_t GetDepth() const;
#endif
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___ */
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