forked from mirrors/gecko-dev
5730ee0ca5
Extend the per-frame-class bit we have to devirtualize IsLeaf to also devirtualize IsFrameOfType. That is, move this data to FrameClasses.py. This was done by going through all the frame classes, trying to preserve behavior. The only quirky thing is that I had to add two more trivial frame classes, `nsAudioFrame` for audio elements, and `nsFloatingFirstLetterFrame`. That's because these frame classes were returning different answers at runtime, but they do this only on conditions that trigger frame reconstruction (floating, and being an audio element, respectively). Differential Revision: https://phabricator.services.mozilla.com/D194703
1107 lines
41 KiB
C++
1107 lines
41 KiB
C++
/* -*- 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;
|
|
namespace mozilla {
|
|
class BlockReflowState;
|
|
class PresShell;
|
|
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, FrameChildListID::Absolute,
|
|
* which contains the absolutely positioned frames.
|
|
*/
|
|
class nsBlockFrame : public nsContainerFrame {
|
|
using BlockReflowState = mozilla::BlockReflowState;
|
|
|
|
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);
|
|
}
|
|
|
|
// Methods declared to be used in 'range-based-for-loop'
|
|
nsLineList& Lines() { return mLines; }
|
|
const nsLineList& Lines() const { return mLines; }
|
|
|
|
friend nsBlockFrame* NS_NewBlockFrame(mozilla::PresShell* 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,
|
|
const nsLineList::iterator* aPrevFrameLine,
|
|
nsFrameList&& aFrameList) override;
|
|
void RemoveFrame(DestroyContext&, ChildListID, nsIFrame* aOldFrame) override;
|
|
nsContainerFrame* GetContentInsertionFrame() override;
|
|
void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
|
|
const nsFrameList& GetChildList(ChildListID aListID) const override;
|
|
void GetChildLists(nsTArray<ChildList>* aLists) const override;
|
|
nscoord SynthesizeFallbackBaseline(
|
|
mozilla::WritingMode aWM,
|
|
BaselineSharingGroup aBaselineGroup) const override;
|
|
BaselineSharingGroup GetDefaultBaselineSharingGroup() const override {
|
|
return BaselineSharingGroup::Last;
|
|
}
|
|
Maybe<nscoord> GetNaturalBaselineBOffset(
|
|
mozilla::WritingMode aWM, BaselineSharingGroup aBaselineGroup,
|
|
BaselineExportContext aExportContext) const override;
|
|
nscoord GetCaretBaseline() const override;
|
|
void Destroy(DestroyContext&) override;
|
|
|
|
bool IsFloatContainingBlock() const override;
|
|
void BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayListSet& aLists) override;
|
|
|
|
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 = "",
|
|
ListFlags aFlags = ListFlags()) 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. The basic idea for the former is that we set the cursor
|
|
// property if the lines' overflowArea.InkOverflow().ys and
|
|
// overflowArea.InkOverflow().yMosts are non-decreasing
|
|
// (considering only non-empty overflowArea.InkOverflow()s; empty
|
|
// overflowArea.InkOverflow()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.
|
|
|
|
// We have two independent line cursors, one used for display-list building
|
|
// and the other for a11y or other frame queries. Either or both may be
|
|
// present at any given time. When we reflow or otherwise munge the lines,
|
|
// both cursors will be cleared.
|
|
// The display cursor is only created and used if the lines satisfy the non-
|
|
// decreasing y-coordinate condition (see SetupLineCursorForDisplay comment
|
|
// below), whereas the query cursor may be created for any block. The two
|
|
// are separated so creating a cursor for a11y queries (eg GetRenderedText)
|
|
// does not risk confusing the display-list building code.
|
|
|
|
// Clear out line cursors because we're disturbing the lines (i.e., Reflow)
|
|
void ClearLineCursors() {
|
|
if (MaybeHasLineCursor()) {
|
|
ClearLineCursorForDisplay();
|
|
ClearLineCursorForQuery();
|
|
RemoveStateBits(NS_BLOCK_HAS_LINE_CURSOR);
|
|
}
|
|
ClearLineIterator();
|
|
}
|
|
void ClearLineCursorForDisplay() {
|
|
RemoveProperty(LineCursorPropertyDisplay());
|
|
}
|
|
void ClearLineCursorForQuery() { RemoveProperty(LineCursorPropertyQuery()); }
|
|
|
|
// Clear just the line-iterator property; this is used if we need to get a
|
|
// LineIterator temporarily during reflow, when using a persisted iterator
|
|
// would be invalid. So we clear the stored property immediately after use.
|
|
void ClearLineIterator() { RemoveProperty(LineIteratorProperty()); }
|
|
|
|
// 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);
|
|
|
|
// Ensure the frame has a display-list line cursor, initializing it to the
|
|
// first line if it is not already present. (If there's an existing cursor,
|
|
// it is left untouched.) Only call this if you guarantee that the lines'
|
|
// combinedArea.ys and combinedArea.yMosts are non-decreasing.
|
|
void SetupLineCursorForDisplay();
|
|
|
|
// Ensure the frame has a query line cursor, initializing it to the first
|
|
// line if it is not already present. (If there's an existing cursor, it is
|
|
// left untouched.)
|
|
void SetupLineCursorForQuery();
|
|
|
|
void ChildIsDirty(nsIFrame* aChild) override;
|
|
|
|
bool IsEmpty() override;
|
|
bool CachedIsEmpty() override;
|
|
bool IsSelfEmpty() override;
|
|
|
|
// Given that we have a ::marker frame, does it actually draw something, i.e.,
|
|
// do we have either a 'list-style-type' or 'list-style-image' that is
|
|
// not 'none', and no 'content'?
|
|
bool MarkerIsEmpty() const;
|
|
|
|
/**
|
|
* Return true if this frame has a ::marker frame.
|
|
*/
|
|
bool HasMarker() const { return HasOutsideMarker() || HasInsideMarker(); }
|
|
|
|
/**
|
|
* @return true if this frame has an inside ::marker frame.
|
|
*/
|
|
bool HasInsideMarker() const {
|
|
return HasAnyStateBits(NS_BLOCK_FRAME_HAS_INSIDE_MARKER);
|
|
}
|
|
|
|
/**
|
|
* @return true if this frame has an outside ::marker frame.
|
|
*/
|
|
bool HasOutsideMarker() const {
|
|
return HasAnyStateBits(NS_BLOCK_FRAME_HAS_OUTSIDE_MARKER);
|
|
}
|
|
|
|
/**
|
|
* @return the ::marker frame or nullptr if we don't have one.
|
|
*/
|
|
nsIFrame* GetMarker() const {
|
|
nsIFrame* outside = GetOutsideMarker();
|
|
return outside ? outside : GetInsideMarker();
|
|
}
|
|
|
|
/**
|
|
* @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:
|
|
// Whether CSS text-indent should be applied to the given line.
|
|
bool TextIndentAppliesTo(const LineIterator& aLine) const;
|
|
|
|
void CheckIntrinsicCacheAgainstShrinkWrapState();
|
|
|
|
template <typename LineIteratorType>
|
|
Maybe<nscoord> GetBaselineBOffset(LineIteratorType aStart,
|
|
LineIteratorType aEnd,
|
|
mozilla::WritingMode aWM,
|
|
BaselineSharingGroup aBaselineGroup,
|
|
BaselineExportContext aExportContext) const;
|
|
|
|
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 aState BlockReflowState passed from parent during reflow.
|
|
* Note: aState.mReflowStatus is mostly an "input" parameter. When this
|
|
* method is called, it should represent what our status would be as if
|
|
* we were shrinkwrapping our children's block-size. This method will
|
|
* then adjust it before returning if our status is different in light
|
|
* of our actual final block-size and current page/column's available
|
|
* block-size.
|
|
* @param aBEndEdgeOfChildren The distance between this frame's block-start
|
|
* border-edge and the block-end edge of our last child's border-box.
|
|
* This is effectively our block-start border-padding plus the
|
|
* block-size of our children, precomputed outside of this function.
|
|
* @return our final block-size with respect to aReflowInput's writing-mode.
|
|
*/
|
|
nscoord ComputeFinalBSize(BlockReflowState& aState,
|
|
nscoord aBEndEdgeOfChildren);
|
|
|
|
void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
|
|
const ReflowInput& aReflowInput,
|
|
nsReflowStatus& aStatus) 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;
|
|
|
|
void StealFrame(nsIFrame* aChild) override;
|
|
|
|
void DeleteNextInFlowChild(DestroyContext&, 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(BlockReflowState* 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.)
|
|
*
|
|
* Note: We often use the term "float-avoiding block" to refer to
|
|
* block-level frames for whom this function returns false.
|
|
*/
|
|
static bool BlockCanIntersectFloats(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Returns the inline size that needs to be cleared past floats for
|
|
* blocks that avoid (i.e. cannot intersect) floats. aState must already
|
|
* have GetFloatAvailableSpace called on it for the block-dir position that
|
|
* we care about (which need not be its current mBCoord)
|
|
*/
|
|
struct FloatAvoidingISizeToClear {
|
|
// Note that we care about the inline-start margin but can ignore
|
|
// the inline-end margin.
|
|
nscoord marginIStart, borderBoxISize;
|
|
};
|
|
static FloatAvoidingISizeToClear ISizeToClearPastFloats(
|
|
const BlockReflowState& aState,
|
|
const mozilla::LogicalRect& aFloatAvailableSpace,
|
|
nsIFrame* aFloatAvoidingBlock);
|
|
|
|
/**
|
|
* 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(BlockReflowState& 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 (marker, 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) {
|
|
#ifdef DEBUG
|
|
InitDebugFlags();
|
|
#endif
|
|
}
|
|
|
|
virtual ~nsBlockFrame();
|
|
|
|
#ifdef DEBUG
|
|
already_AddRefed<ComputedStyle> GetFirstLetterStyle(
|
|
nsPresContext* aPresContext);
|
|
#endif
|
|
|
|
NS_DECLARE_FRAME_PROPERTY_WITHOUT_DTOR(LineCursorPropertyDisplay, nsLineBox)
|
|
NS_DECLARE_FRAME_PROPERTY_WITHOUT_DTOR(LineCursorPropertyQuery, nsLineBox)
|
|
// Note that the NS_BLOCK_HAS_LINE_CURSOR flag does not necessarily mean the
|
|
// cursor is present, as it covers both the "display" and "query" cursors,
|
|
// but may remain set if they have been separately deleted. In such a case,
|
|
// the Get* accessors will be slightly more expensive, but will still safely
|
|
// return null if the cursor is absent.
|
|
bool MaybeHasLineCursor() {
|
|
return HasAnyStateBits(NS_BLOCK_HAS_LINE_CURSOR);
|
|
}
|
|
nsLineBox* GetLineCursorForDisplay() {
|
|
return MaybeHasLineCursor() ? GetProperty(LineCursorPropertyDisplay())
|
|
: nullptr;
|
|
}
|
|
nsLineBox* GetLineCursorForQuery() {
|
|
return MaybeHasLineCursor() ? GetProperty(LineCursorPropertyQuery())
|
|
: 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 == GetLineCursorForDisplay()) {
|
|
ClearLineCursorForDisplay();
|
|
}
|
|
if (aLine == GetLineCursorForQuery()) {
|
|
ClearLineCursorForQuery();
|
|
}
|
|
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(BlockReflowState& aState, nsLineBox* aLine,
|
|
nscoord aDeltaBCoord);
|
|
|
|
void UpdateLineContainerSize(nsLineBox* aLine,
|
|
const nsSize& aNewContainerSize);
|
|
|
|
// helper for SlideLine and UpdateLineContainerSize
|
|
void MoveChildFramesOfLine(nsLineBox* aLine, nscoord aDeltaBCoord);
|
|
|
|
// Returns block-end edge of children.
|
|
nscoord ComputeFinalSize(const ReflowInput& aReflowInput,
|
|
BlockReflowState& aState, ReflowOutput& aMetrics);
|
|
|
|
/**
|
|
* Helper method for Reflow(). Computes the overflow areas created by our
|
|
* children, and includes them into aOverflowAreas.
|
|
*/
|
|
void ComputeOverflowAreas(mozilla::OverflowAreas& aOverflowAreas,
|
|
nscoord aBEndEdgeOfChildren,
|
|
const nsStyleDisplay* aDisplay) const;
|
|
|
|
/**
|
|
* Helper method for ComputeOverflowAreas(). Incorporates aBEndEdgeOfChildren
|
|
* into the aOverflowAreas.
|
|
*/
|
|
void ConsiderBlockEndEdgeOfChildren(mozilla::OverflowAreas& aOverflowAreas,
|
|
nscoord aBEndEdgeOfChildren,
|
|
const nsStyleDisplay* aDisplay) const;
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* aPrevSiblingLine, if present, must be the line containing aPrevSibling.
|
|
* Providing it will make this function faster.
|
|
*/
|
|
void AddFrames(nsFrameList&& aFrameList, nsIFrame* aPrevSibling,
|
|
const nsLineList::iterator* aPrevSiblingLine);
|
|
|
|
// Return the :-moz-block-ruby-content child frame, if any.
|
|
// (It's non-null only if this block frame is for 'display:block ruby'.)
|
|
nsContainerFrame* GetRubyContentPseudoFrame();
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* For text-wrap:balance, we iteratively try reflowing with adjusted inline
|
|
* size to find the "best" result (the tightest size that can be applied
|
|
* without increasing the total line count of the block).
|
|
* This record is used to manage the state of these "trial reflows", and
|
|
* return results from the final trial.
|
|
*/
|
|
struct TrialReflowState {
|
|
// Values pre-computed at start of Reflow(), constant across trials.
|
|
const nscoord mConsumedBSize;
|
|
const nscoord mEffectiveContentBoxBSize;
|
|
bool mNeedFloatManager;
|
|
// Settings for the current trial.
|
|
bool mBalancing = false;
|
|
nscoord mInset = 0;
|
|
// Results computed during the trial reflow. Values from the final trial
|
|
// will be used by the remainder of Reflow().
|
|
mozilla::OverflowAreas mOcBounds;
|
|
mozilla::OverflowAreas mFcBounds;
|
|
nscoord mBlockEndEdgeOfChildren = 0;
|
|
nscoord mContainerWidth = 0;
|
|
|
|
// Initialize for the initial trial reflow, with zero inset.
|
|
TrialReflowState(nscoord aConsumedBSize, nscoord aEffectiveContentBoxBSize,
|
|
bool aNeedFloatManager)
|
|
: mConsumedBSize(aConsumedBSize),
|
|
mEffectiveContentBoxBSize(aEffectiveContentBoxBSize),
|
|
mNeedFloatManager(aNeedFloatManager) {}
|
|
|
|
// Adjust the inset amount, and reset state for a new trial.
|
|
void ResetForBalance(nscoord aInsetDelta) {
|
|
// Tells the reflow-lines loop we must consider all lines "dirty" (as we
|
|
// are modifying the effective inline-size to be used).
|
|
mBalancing = true;
|
|
// Adjust inset to apply.
|
|
mInset += aInsetDelta;
|
|
// Re-initialize state that the reflow loop will compute.
|
|
mOcBounds.Clear();
|
|
mFcBounds.Clear();
|
|
mBlockEndEdgeOfChildren = 0;
|
|
mContainerWidth = 0;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Internal helper for Reflow(); may be called repeatedly during a single
|
|
* Reflow() in order to implement text-wrap:balance.
|
|
* This method applies aTrialState.mInset during line-breaking to reduce
|
|
* the effective available inline-size (without affecting alignment).
|
|
*/
|
|
nsReflowStatus TrialReflow(nsPresContext* aPresContext,
|
|
ReflowOutput& aMetrics,
|
|
const ReflowInput& aReflowInput,
|
|
TrialReflowState& aTrialState);
|
|
|
|
public:
|
|
/**
|
|
* Helper function for the frame ctor to register a ::marker frame.
|
|
*/
|
|
void SetMarkerFrameForListItem(nsIFrame* aMarkerFrame);
|
|
|
|
/**
|
|
* 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(DestroyContext&, nsIFrame* aDeletedFrame, uint32_t aFlags);
|
|
|
|
void ReparentFloats(nsIFrame* aFirstFrame, nsBlockFrame* aOldParent,
|
|
bool aReparentSiblings);
|
|
|
|
bool ComputeCustomOverflow(mozilla::OverflowAreas&) override;
|
|
|
|
void UnionChildOverflow(mozilla::OverflowAreas&) 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;
|
|
|
|
// @see nsIFrame::AddSizeOfExcludingThisForTree
|
|
void AddSizeOfExcludingThisForTree(nsWindowSizes&) const override;
|
|
|
|
/**
|
|
* Clears any -webkit-line-clamp ellipsis on a line in this block or one
|
|
* of its descendants.
|
|
*/
|
|
void ClearLineClampEllipsis();
|
|
|
|
/**
|
|
* Returns whether this block is in a -webkit-line-clamp context. That is,
|
|
* whether this block is in a block formatting-context whose root block has
|
|
* -webkit-line-clamp: <n>.
|
|
*/
|
|
bool IsInLineClampContext() const;
|
|
|
|
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 HasAnyStateBits(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(BlockReflowState& aState,
|
|
mozilla::OverflowAreas& aOverflowAreas);
|
|
|
|
/**
|
|
* Find any trailing BR clear from the last line of this block (or from its
|
|
* prev-in-flows).
|
|
*/
|
|
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(DestroyContext&, nsIFrame*);
|
|
|
|
/** set up the conditions necessary for an resize reflow
|
|
* the primary task is to mark the minimumly sufficient lines dirty.
|
|
*/
|
|
void PrepareResizeReflow(BlockReflowState& aState);
|
|
|
|
/** reflow all lines that have been marked dirty */
|
|
void ReflowDirtyLines(BlockReflowState& 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 input
|
|
* @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(BlockReflowState& 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(BlockReflowState& 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(BlockReflowState& aState, LineIterator aLine);
|
|
|
|
void DeleteLine(BlockReflowState& aState, nsLineList::iterator aLine,
|
|
nsLineList::iterator aLineEnd);
|
|
|
|
//----------------------------------------
|
|
// Methods for individual frame reflow
|
|
|
|
bool ShouldApplyBStartMargin(BlockReflowState& aState, nsLineBox* aLine);
|
|
|
|
void ReflowBlockFrame(BlockReflowState& aState, LineIterator aLine,
|
|
bool* aKeepGoing);
|
|
|
|
void ReflowInlineFrames(BlockReflowState& aState, LineIterator aLine,
|
|
bool* aKeepLineGoing);
|
|
|
|
void DoReflowInlineFrames(
|
|
BlockReflowState& aState, nsLineLayout& aLineLayout, LineIterator aLine,
|
|
nsFlowAreaRect& aFloatAvailableSpace, nscoord& aAvailableSpaceBSize,
|
|
nsFloatManager::SavedState* aFloatStateBeforeLine, bool* aKeepReflowGoing,
|
|
LineReflowStatus* aLineReflowStatus, bool aAllowPullUp);
|
|
|
|
void ReflowInlineFrame(BlockReflowState& aState, nsLineLayout& aLineLayout,
|
|
LineIterator aLine, nsIFrame* aFrame,
|
|
LineReflowStatus* aLineReflowStatus);
|
|
|
|
// @param aReflowStatus an incomplete status indicates the float should be
|
|
// split but only if the available block-size is constrained.
|
|
void ReflowFloat(BlockReflowState& aState, ReflowInput& aFloatRI,
|
|
nsIFrame* aFloat, 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(BlockReflowState& aState, nsLineBox* aLine,
|
|
nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Set line-break-before status in aState.mReflowStatus because aLine cannot
|
|
* be placed on this page/column and we don't want to break within ourselves.
|
|
* Also, mark the aLine dirty, and set aKeepReflowGoing to false;
|
|
*/
|
|
void SetBreakBeforeStatusBeforeLine(BlockReflowState& aState,
|
|
LineIterator aLine,
|
|
bool* aKeepReflowGoing);
|
|
|
|
/**
|
|
* 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(BlockReflowState& aState, LineIterator aLine,
|
|
bool* aKeepReflowGoing);
|
|
|
|
void SplitLine(BlockReflowState& 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(BlockReflowState& 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(BlockReflowState& aState, nsLineList::iterator aLineBefore);
|
|
|
|
void PropagateFloatDamage(BlockReflowState& aState, nsLineBox* aLine,
|
|
nscoord aDeltaBCoord);
|
|
|
|
void CheckFloats(BlockReflowState& aState);
|
|
|
|
//----------------------------------------
|
|
// List handling kludge
|
|
|
|
void ReflowOutsideMarker(nsIFrame* aMarkerFrame, BlockReflowState& aState,
|
|
ReflowOutput& aMetrics, nscoord aLineTop);
|
|
|
|
//----------------------------------------
|
|
|
|
NS_DECLARE_FRAME_PROPERTY_DELETABLE(LineIteratorProperty, nsLineIterator);
|
|
|
|
bool CanProvideLineIterator() const final { return true; }
|
|
nsILineIterator* GetLineIterator() final;
|
|
|
|
public:
|
|
bool HasOverflowLines() const {
|
|
return HasAnyStateBits(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 = std::move(*mPropValue);
|
|
}
|
|
}
|
|
~nsAutoOOFFrameList() {
|
|
mBlock->SetOverflowOutOfFlows(std::move(mList), mPropValue);
|
|
}
|
|
|
|
protected:
|
|
nsFrameList* const mPropValue;
|
|
nsBlockFrame* const mBlock;
|
|
};
|
|
friend struct nsAutoOOFFrameList;
|
|
|
|
nsFrameList* GetOverflowOutOfFlows() const;
|
|
|
|
// This takes ownership of the frames in aList.
|
|
void SetOverflowOutOfFlows(nsFrameList&& aList, nsFrameList* aPropValue);
|
|
|
|
/**
|
|
* @return the inside ::marker frame or nullptr if we don't have one.
|
|
*/
|
|
nsIFrame* GetInsideMarker() const;
|
|
|
|
/**
|
|
* @return the outside ::marker frame or nullptr if we don't have one.
|
|
*/
|
|
nsIFrame* GetOutsideMarker() const;
|
|
|
|
/**
|
|
* @return the outside ::marker frame list frame property.
|
|
*/
|
|
nsFrameList* GetOutsideMarkerList() const;
|
|
|
|
/**
|
|
* @return true if this frame has pushed floats.
|
|
*/
|
|
bool HasPushedFloats() const {
|
|
return HasAnyStateBits(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 mCachedMinISize = NS_INTRINSIC_ISIZE_UNKNOWN;
|
|
nscoord mCachedPrefISize = NS_INTRINSIC_ISIZE_UNKNOWN;
|
|
|
|
nsLineList mLines;
|
|
|
|
// List of all floats in this block
|
|
// XXXmats blocks rarely have floats, make it a frame property
|
|
nsFrameList mFloats;
|
|
|
|
friend class mozilla::BlockReflowState;
|
|
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);
|
|
|
|
// Allow to be uninitialized (and then assigned from another object).
|
|
nsBlockInFlowLineIterator() : mFrame(nullptr) {}
|
|
|
|
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();
|
|
|
|
// 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);
|
|
|
|
private:
|
|
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___ */
|