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gecko-dev/layout/generic/nsLineBox.h
Ting-Yu Lin 758e250089 Bug 1342330 Part 3 - Convert FlagBits::mBreakType to StyleClear. r=xidorn 
We can avoid static_cast if using StyleClear type directly.

MozReview-Commit-ID: 3lh2VJCAfuW

--HG--
extra : rebase_source : db3058559757b8f4df2a7d6cb9b31013cec220e2
2017-02-24 15:27:23 +08:00

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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/. */
/* representation of one line within a block frame, a CSS line box */
#ifndef nsLineBox_h___
#define nsLineBox_h___
#include "mozilla/Attributes.h"
#include "mozilla/Likely.h"
#include "nsILineIterator.h"
#include "nsIFrame.h"
#include <algorithm>
class nsLineBox;
class nsFloatCache;
class nsFloatCacheList;
class nsFloatCacheFreeList;
// State cached after reflowing a float. This state is used during
// incremental reflow when we avoid reflowing a float.
class nsFloatCache {
public:
nsFloatCache();
#ifdef NS_BUILD_REFCNT_LOGGING
~nsFloatCache();
#else
~nsFloatCache() { }
#endif
nsFloatCache* Next() const { return mNext; }
nsIFrame* mFloat; // floating frame
protected:
nsFloatCache* mNext;
friend class nsFloatCacheList;
friend class nsFloatCacheFreeList;
};
//----------------------------------------
class nsFloatCacheList {
public:
#ifdef NS_BUILD_REFCNT_LOGGING
nsFloatCacheList();
#else
nsFloatCacheList() : mHead(nullptr) { }
#endif
~nsFloatCacheList();
bool IsEmpty() const {
return nullptr == mHead;
}
bool NotEmpty() const {
return nullptr != mHead;
}
nsFloatCache* Head() const {
return mHead;
}
nsFloatCache* Tail() const;
void DeleteAll();
nsFloatCache* Find(nsIFrame* aOutOfFlowFrame);
// Remove a nsFloatCache from this list. Deleting this nsFloatCache
// becomes the caller's responsibility.
void Remove(nsFloatCache* aElement) { RemoveAndReturnPrev(aElement); }
// Steal away aList's nsFloatCache objects and put them in this
// list. aList must not be empty.
void Append(nsFloatCacheFreeList& aList);
protected:
nsFloatCache* mHead;
// Remove a nsFloatCache from this list. Deleting this nsFloatCache
// becomes the caller's responsibility. Returns the nsFloatCache that was
// before aElement, or nullptr if aElement was the first.
nsFloatCache* RemoveAndReturnPrev(nsFloatCache* aElement);
friend class nsFloatCacheFreeList;
};
//---------------------------------------
// Like nsFloatCacheList, but with fast access to the tail
class nsFloatCacheFreeList : private nsFloatCacheList {
public:
#ifdef NS_BUILD_REFCNT_LOGGING
nsFloatCacheFreeList();
~nsFloatCacheFreeList();
#else
nsFloatCacheFreeList() : mTail(nullptr) { }
~nsFloatCacheFreeList() { }
#endif
// Reimplement trivial functions
bool IsEmpty() const {
return nullptr == mHead;
}
nsFloatCache* Head() const {
return mHead;
}
nsFloatCache* Tail() const {
return mTail;
}
bool NotEmpty() const {
return nullptr != mHead;
}
void DeleteAll();
// Steal away aList's nsFloatCache objects and put them on this
// free-list. aList must not be empty.
void Append(nsFloatCacheList& aList);
void Append(nsFloatCache* aFloatCache);
void Remove(nsFloatCache* aElement);
// Remove an nsFloatCache object from this list and return it, or create
// a new one if this one is empty; Set its mFloat to aFloat.
nsFloatCache* Alloc(nsIFrame* aFloat);
protected:
nsFloatCache* mTail;
friend class nsFloatCacheList;
};
//----------------------------------------------------------------------
#define LINE_MAX_CHILD_COUNT INT32_MAX
/**
* Function to create a line box and initialize it with a single frame.
* The allocation is infallible.
* If the frame was moved from another line then you're responsible
* for notifying that line using NoteFrameRemoved(). Alternatively,
* it's better to use the next function that does that for you in an
* optimal way.
*/
nsLineBox* NS_NewLineBox(nsIPresShell* aPresShell, nsIFrame* aFrame,
bool aIsBlock);
/**
* Function to create a line box and initialize it with aCount frames
* that are currently on aFromLine. The allocation is infallible.
*/
nsLineBox* NS_NewLineBox(nsIPresShell* aPresShell, nsLineBox* aFromLine,
nsIFrame* aFrame, int32_t aCount);
class nsLineList;
// don't use the following names outside of this file. Instead, use
// nsLineList::iterator, etc. These are just here to allow them to
// be specified as parameters to methods of nsLineBox.
class nsLineList_iterator;
class nsLineList_const_iterator;
class nsLineList_reverse_iterator;
class nsLineList_const_reverse_iterator;
/**
* Users must have the class that is to be part of the list inherit
* from nsLineLink. If they want to be efficient, it should be the
* first base class. (This was originally nsCLink in a templatized
* nsCList, but it's still useful separately.)
*/
class nsLineLink {
public:
friend class nsLineList;
friend class nsLineList_iterator;
friend class nsLineList_reverse_iterator;
friend class nsLineList_const_iterator;
friend class nsLineList_const_reverse_iterator;
private:
nsLineLink *_mNext; // or head
nsLineLink *_mPrev; // or tail
};
/**
* The nsLineBox class represents a horizontal line of frames. It contains
* enough state to support incremental reflow of the frames, event handling
* for the frames, and rendering of the frames.
*/
class nsLineBox final : public nsLineLink {
private:
nsLineBox(nsIFrame* aFrame, int32_t aCount, bool aIsBlock);
~nsLineBox();
// Infallible overloaded new operator. Uses an arena (which comes from the
// presShell) to perform the allocation.
void* operator new(size_t sz, nsIPresShell* aPresShell);
void operator delete(void* aPtr, size_t sz) = delete;
public:
// Use these functions to allocate and destroy line boxes
friend nsLineBox* NS_NewLineBox(nsIPresShell* aPresShell, nsIFrame* aFrame,
bool aIsBlock);
friend nsLineBox* NS_NewLineBox(nsIPresShell* aPresShell, nsLineBox* aFromLine,
nsIFrame* aFrame, int32_t aCount);
void Destroy(nsIPresShell* aPresShell);
// mBlock bit
bool IsBlock() const {
return mFlags.mBlock;
}
bool IsInline() const {
return !mFlags.mBlock;
}
// mDirty bit
void MarkDirty() {
mFlags.mDirty = 1;
}
void ClearDirty() {
mFlags.mDirty = 0;
}
bool IsDirty() const {
return mFlags.mDirty;
}
// mPreviousMarginDirty bit
void MarkPreviousMarginDirty() {
mFlags.mPreviousMarginDirty = 1;
}
void ClearPreviousMarginDirty() {
mFlags.mPreviousMarginDirty = 0;
}
bool IsPreviousMarginDirty() const {
return mFlags.mPreviousMarginDirty;
}
// mHasClearance bit
void SetHasClearance() {
mFlags.mHasClearance = 1;
}
void ClearHasClearance() {
mFlags.mHasClearance = 0;
}
bool HasClearance() const {
return mFlags.mHasClearance;
}
// mImpactedByFloat bit
void SetLineIsImpactedByFloat(bool aValue) {
mFlags.mImpactedByFloat = aValue;
}
bool IsImpactedByFloat() const {
return mFlags.mImpactedByFloat;
}
// mLineWrapped bit
void SetLineWrapped(bool aOn) {
mFlags.mLineWrapped = aOn;
}
bool IsLineWrapped() const {
return mFlags.mLineWrapped;
}
// mInvalidateTextRuns bit
void SetInvalidateTextRuns(bool aOn) {
mFlags.mInvalidateTextRuns = aOn;
}
bool GetInvalidateTextRuns() const {
return mFlags.mInvalidateTextRuns;
}
// mResizeReflowOptimizationDisabled bit
void DisableResizeReflowOptimization() {
mFlags.mResizeReflowOptimizationDisabled = true;
}
void EnableResizeReflowOptimization() {
mFlags.mResizeReflowOptimizationDisabled = false;
}
bool ResizeReflowOptimizationDisabled() const {
return mFlags.mResizeReflowOptimizationDisabled;
}
// mHasBullet bit
void SetHasBullet() {
mFlags.mHasBullet = true;
InvalidateCachedIsEmpty();
}
void ClearHasBullet() {
mFlags.mHasBullet = false;
InvalidateCachedIsEmpty();
}
bool HasBullet() const {
return mFlags.mHasBullet;
}
// mHadFloatPushed bit
void SetHadFloatPushed() {
mFlags.mHadFloatPushed = true;
}
void ClearHadFloatPushed() {
mFlags.mHadFloatPushed = false;
}
bool HadFloatPushed() const {
return mFlags.mHadFloatPushed;
}
private:
// Add a hash table for fast lookup when the line has more frames than this.
static const uint32_t kMinChildCountForHashtable = 200;
/**
* Take ownership of aFromLine's hash table and remove the frames that
* stay on aFromLine from it, i.e. aFromLineNewCount frames starting with
* mFirstChild. This method is used to optimize moving a large number
* of frames from one line to the next.
*/
void StealHashTableFrom(nsLineBox* aFromLine, uint32_t aFromLineNewCount);
/**
* Does the equivalent of this->NoteFrameAdded and aFromLine->NoteFrameRemoved
* for each frame on this line, but in a optimized way.
*/
void NoteFramesMovedFrom(nsLineBox* aFromLine);
void SwitchToHashtable()
{
MOZ_ASSERT(!mFlags.mHasHashedFrames);
uint32_t count = GetChildCount();
mFlags.mHasHashedFrames = 1;
uint32_t minLength = std::max(kMinChildCountForHashtable,
uint32_t(PLDHashTable::kDefaultInitialLength));
mFrames = new nsTHashtable< nsPtrHashKey<nsIFrame> >(std::max(count, minLength));
for (nsIFrame* f = mFirstChild; count-- > 0; f = f->GetNextSibling()) {
mFrames->PutEntry(f);
}
}
void SwitchToCounter() {
MOZ_ASSERT(mFlags.mHasHashedFrames);
uint32_t count = GetChildCount();
delete mFrames;
mFlags.mHasHashedFrames = 0;
mChildCount = count;
}
public:
int32_t GetChildCount() const {
return MOZ_UNLIKELY(mFlags.mHasHashedFrames) ? mFrames->Count() : mChildCount;
}
/**
* Register that aFrame is now on this line.
*/
void NoteFrameAdded(nsIFrame* aFrame) {
if (MOZ_UNLIKELY(mFlags.mHasHashedFrames)) {
mFrames->PutEntry(aFrame);
} else {
if (++mChildCount >= kMinChildCountForHashtable) {
SwitchToHashtable();
}
}
}
/**
* Register that aFrame is not on this line anymore.
*/
void NoteFrameRemoved(nsIFrame* aFrame) {
MOZ_ASSERT(GetChildCount() > 0);
if (MOZ_UNLIKELY(mFlags.mHasHashedFrames)) {
mFrames->RemoveEntry(aFrame);
if (mFrames->Count() < kMinChildCountForHashtable) {
SwitchToCounter();
}
} else {
--mChildCount;
}
}
// mBreakType value
// Break information is applied *before* the line if the line is a block,
// or *after* the line if the line is an inline. Confusing, I know, but
// using different names should help.
using StyleClear = mozilla::StyleClear;
bool HasBreakBefore() const {
return IsBlock() && StyleClear::None != BreakType();
}
void SetBreakTypeBefore(StyleClear aBreakType) {
MOZ_ASSERT(IsBlock(), "Only blocks have break-before");
MOZ_ASSERT(aBreakType == StyleClear::None ||
aBreakType == StyleClear::Left ||
aBreakType == StyleClear::Right ||
aBreakType == StyleClear::Both,
"Only float break types are allowed before a line");
mFlags.mBreakType = aBreakType;
}
StyleClear GetBreakTypeBefore() const {
return IsBlock() ? BreakType() : StyleClear::None;
}
bool HasBreakAfter() const {
return !IsBlock() && StyleClear::None != BreakType();
}
void SetBreakTypeAfter(StyleClear aBreakType) {
MOZ_ASSERT(!IsBlock(), "Only inlines have break-after");
mFlags.mBreakType = aBreakType;
}
bool HasFloatBreakAfter() const {
return !IsBlock() &&
(StyleClear::Left == BreakType() ||
StyleClear::Right == BreakType() ||
StyleClear::Both == BreakType());
}
StyleClear GetBreakTypeAfter() const {
return !IsBlock() ? BreakType() : StyleClear::None;
}
// mCarriedOutBEndMargin value
nsCollapsingMargin GetCarriedOutBEndMargin() const;
// Returns true if the margin changed
bool SetCarriedOutBEndMargin(nsCollapsingMargin aValue);
// mFloats
bool HasFloats() const {
return (IsInline() && mInlineData) && mInlineData->mFloats.NotEmpty();
}
nsFloatCache* GetFirstFloat();
void FreeFloats(nsFloatCacheFreeList& aFreeList);
void AppendFloats(nsFloatCacheFreeList& aFreeList);
bool RemoveFloat(nsIFrame* aFrame);
// Combined area is the area of the line that should influence the
// overflow area of its parent block. The combined area should be
// used for painting-related things, but should never be used for
// layout (except for handling of 'overflow').
void SetOverflowAreas(const nsOverflowAreas& aOverflowAreas);
mozilla::LogicalRect GetOverflowArea(nsOverflowType aType,
mozilla::WritingMode aWM,
const nsSize& aContainerSize)
{
return mozilla::LogicalRect(aWM, GetOverflowArea(aType), aContainerSize);
}
nsRect GetOverflowArea(nsOverflowType aType) {
return mData ? mData->mOverflowAreas.Overflow(aType) : GetPhysicalBounds();
}
nsOverflowAreas GetOverflowAreas() {
if (mData) {
return mData->mOverflowAreas;
}
nsRect bounds = GetPhysicalBounds();
return nsOverflowAreas(bounds, bounds);
}
nsRect GetVisualOverflowArea()
{ return GetOverflowArea(eVisualOverflow); }
nsRect GetScrollableOverflowArea()
{ return GetOverflowArea(eScrollableOverflow); }
void SlideBy(nscoord aDBCoord, const nsSize& aContainerSize) {
NS_ASSERTION(aContainerSize == mContainerSize ||
mContainerSize == nsSize(-1, -1),
"container size doesn't match");
mContainerSize = aContainerSize;
mBounds.BStart(mWritingMode) += aDBCoord;
if (mData) {
// Use a null containerSize to convert vector from logical to physical.
const nsSize nullContainerSize;
nsPoint physicalDelta =
mozilla::LogicalPoint(mWritingMode, 0, aDBCoord).
GetPhysicalPoint(mWritingMode, nullContainerSize);
NS_FOR_FRAME_OVERFLOW_TYPES(otype) {
mData->mOverflowAreas.Overflow(otype) += physicalDelta;
}
}
}
// Container-size for the line is changing (and therefore if writing mode
// was vertical-rl, the line will move physically; this is like SlideBy,
// but it is the container size instead of the line's own logical coord
// that is changing.
nsSize UpdateContainerSize(const nsSize aNewContainerSize)
{
NS_ASSERTION(mContainerSize != nsSize(-1, -1), "container size not set");
nsSize delta = mContainerSize - aNewContainerSize;
mContainerSize = aNewContainerSize;
// this has a physical-coordinate effect only in vertical-rl mode
if (mWritingMode.IsVerticalRL() && mData) {
nsPoint physicalDelta(-delta.width, 0);
NS_FOR_FRAME_OVERFLOW_TYPES(otype) {
mData->mOverflowAreas.Overflow(otype) += physicalDelta;
}
}
return delta;
}
void IndentBy(nscoord aDICoord, const nsSize& aContainerSize) {
NS_ASSERTION(aContainerSize == mContainerSize ||
mContainerSize == nsSize(-1, -1),
"container size doesn't match");
mContainerSize = aContainerSize;
mBounds.IStart(mWritingMode) += aDICoord;
}
void ExpandBy(nscoord aDISize, const nsSize& aContainerSize) {
NS_ASSERTION(aContainerSize == mContainerSize ||
mContainerSize == nsSize(-1, -1),
"container size doesn't match");
mContainerSize = aContainerSize;
mBounds.ISize(mWritingMode) += aDISize;
}
/**
* The logical ascent (distance from block-start to baseline) of the
* linebox is the logical ascent of the anonymous inline box (for
* which we don't actually create a frame) that wraps all the
* consecutive inline children of a block.
*
* This is currently unused for block lines.
*/
nscoord GetLogicalAscent() const { return mAscent; }
void SetLogicalAscent(nscoord aAscent) { mAscent = aAscent; }
nscoord BStart() const {
return mBounds.BStart(mWritingMode);
}
nscoord BSize() const {
return mBounds.BSize(mWritingMode);
}
nscoord BEnd() const {
return mBounds.BEnd(mWritingMode);
}
nscoord IStart() const {
return mBounds.IStart(mWritingMode);
}
nscoord ISize() const {
return mBounds.ISize(mWritingMode);
}
nscoord IEnd() const {
return mBounds.IEnd(mWritingMode);
}
void SetBoundsEmpty() {
mBounds.IStart(mWritingMode) = 0;
mBounds.ISize(mWritingMode) = 0;
mBounds.BStart(mWritingMode) = 0;
mBounds.BSize(mWritingMode) = 0;
}
static void DeleteLineList(nsPresContext* aPresContext, nsLineList& aLines,
nsIFrame* aDestructRoot, nsFrameList* aFrames);
// search from end to beginning of [aBegin, aEnd)
// Returns true if it found the line and false if not.
// Moves aEnd as it searches so that aEnd points to the resulting line.
// aLastFrameBeforeEnd is the last frame before aEnd (so if aEnd is
// the end of the line list, it's just the last frame in the frame
// list).
static bool RFindLineContaining(nsIFrame* aFrame,
const nsLineList_iterator& aBegin,
nsLineList_iterator& aEnd,
nsIFrame* aLastFrameBeforeEnd,
int32_t* aFrameIndexInLine);
#ifdef DEBUG_FRAME_DUMP
const char* BreakTypeToString(StyleClear aBreakType) const;
char* StateToString(char* aBuf, int32_t aBufSize) const;
void List(FILE* out, int32_t aIndent, uint32_t aFlags = 0) const;
void List(FILE* out = stderr, const char* aPrefix = "", uint32_t aFlags = 0) const;
nsIFrame* LastChild() const;
#endif
private:
int32_t IndexOf(nsIFrame* aFrame) const;
public:
bool Contains(nsIFrame* aFrame) const {
return MOZ_UNLIKELY(mFlags.mHasHashedFrames) ? mFrames->Contains(aFrame)
: IndexOf(aFrame) >= 0;
}
// whether the line box is "logically" empty (just like nsIFrame::IsEmpty)
bool IsEmpty() const;
// Call this only while in Reflow() for the block the line belongs
// to, only between reflowing the line (or sliding it, if we skip
// reflowing it) and the end of reflowing the block.
bool CachedIsEmpty();
void InvalidateCachedIsEmpty() {
mFlags.mEmptyCacheValid = false;
}
// For debugging purposes
bool IsValidCachedIsEmpty() {
return mFlags.mEmptyCacheValid;
}
#ifdef DEBUG
static int32_t GetCtorCount();
#endif
nsIFrame* mFirstChild;
mozilla::WritingMode mWritingMode;
// Physical size. Use only for physical <-> logical coordinate conversion.
nsSize mContainerSize;
private:
mozilla::LogicalRect mBounds;
public:
const mozilla::LogicalRect& GetBounds() { return mBounds; }
nsRect GetPhysicalBounds() const
{
if (mBounds.IsAllZero()) {
return nsRect(0, 0, 0, 0);
}
NS_ASSERTION(mContainerSize != nsSize(-1, -1),
"mContainerSize not initialized");
return mBounds.GetPhysicalRect(mWritingMode, mContainerSize);
}
void SetBounds(mozilla::WritingMode aWritingMode,
nscoord aIStart, nscoord aBStart,
nscoord aISize, nscoord aBSize,
const nsSize& aContainerSize)
{
mWritingMode = aWritingMode;
mContainerSize = aContainerSize;
mBounds = mozilla::LogicalRect(aWritingMode, aIStart, aBStart,
aISize, aBSize);
}
void SetBounds(mozilla::WritingMode aWritingMode,
nsRect aRect, const nsSize& aContainerSize)
{
mWritingMode = aWritingMode;
mContainerSize = aContainerSize;
mBounds = mozilla::LogicalRect(aWritingMode, aRect, aContainerSize);
}
// mFlags.mHasHashedFrames says which one to use
union {
nsTHashtable< nsPtrHashKey<nsIFrame> >* mFrames;
uint32_t mChildCount;
};
struct FlagBits {
bool mDirty : 1;
bool mPreviousMarginDirty : 1;
bool mHasClearance : 1;
bool mBlock : 1;
bool mImpactedByFloat : 1;
bool mLineWrapped: 1;
bool mInvalidateTextRuns : 1;
// default 0 = means that the opt potentially applies to this line.
// 1 = never skip reflowing this line for a resize reflow
bool mResizeReflowOptimizationDisabled: 1;
bool mEmptyCacheValid: 1;
bool mEmptyCacheState: 1;
// mHasBullet indicates that this is an inline line whose block's
// bullet is adjacent to this line and non-empty.
bool mHasBullet : 1;
// Indicates that this line *may* have a placeholder for a float
// that was pushed to a later column or page.
bool mHadFloatPushed : 1;
bool mHasHashedFrames: 1;
StyleClear mBreakType;
};
struct ExtraData {
explicit ExtraData(const nsRect& aBounds) : mOverflowAreas(aBounds, aBounds) {
}
nsOverflowAreas mOverflowAreas;
};
struct ExtraBlockData : public ExtraData {
explicit ExtraBlockData(const nsRect& aBounds)
: ExtraData(aBounds),
mCarriedOutBEndMargin()
{
}
nsCollapsingMargin mCarriedOutBEndMargin;
};
struct ExtraInlineData : public ExtraData {
explicit ExtraInlineData(const nsRect& aBounds) : ExtraData(aBounds) {
}
nsFloatCacheList mFloats;
};
protected:
nscoord mAscent; // see |SetAscent| / |GetAscent|
static_assert(sizeof(FlagBits) <= sizeof(uint32_t),
"size of FlagBits should not be larger than size of uint32_t");
union {
uint32_t mAllFlags;
FlagBits mFlags;
};
StyleClear BreakType() const {
return mFlags.mBreakType;
};
union {
ExtraData* mData;
ExtraBlockData* mBlockData;
ExtraInlineData* mInlineData;
};
void Cleanup();
void MaybeFreeData();
};
/**
* A linked list type where the items in the list must inherit from
* a link type to fuse allocations.
*
* API heavily based on the |list| class in the C++ standard.
*/
class nsLineList_iterator {
public:
friend class nsLineList;
friend class nsLineList_reverse_iterator;
friend class nsLineList_const_iterator;
friend class nsLineList_const_reverse_iterator;
typedef nsLineList_iterator iterator_self_type;
typedef nsLineList_reverse_iterator iterator_reverse_type;
typedef nsLineBox& reference;
typedef const nsLineBox& const_reference;
typedef nsLineBox* pointer;
typedef const nsLineBox* const_pointer;
typedef uint32_t size_type;
typedef int32_t difference_type;
typedef nsLineLink link_type;
#ifdef DEBUG
nsLineList_iterator() { memset(&mCurrent, 0xcd, sizeof(mCurrent)); }
#else
// Auto generated default constructor OK.
#endif
// Auto generated copy-constructor OK.
inline iterator_self_type&
operator=(const iterator_self_type& aOther);
inline iterator_self_type&
operator=(const iterator_reverse_type& aOther);
iterator_self_type& operator++()
{
mCurrent = mCurrent->_mNext;
return *this;
}
iterator_self_type operator++(int)
{
iterator_self_type rv(*this);
mCurrent = mCurrent->_mNext;
return rv;
}
iterator_self_type& operator--()
{
mCurrent = mCurrent->_mPrev;
return *this;
}
iterator_self_type operator--(int)
{
iterator_self_type rv(*this);
mCurrent = mCurrent->_mPrev;
return rv;
}
reference operator*()
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return *static_cast<pointer>(mCurrent);
}
pointer operator->()
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<pointer>(mCurrent);
}
pointer get()
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<pointer>(mCurrent);
}
operator pointer()
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<pointer>(mCurrent);
}
const_reference operator*() const
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return *static_cast<const_pointer>(mCurrent);
}
const_pointer operator->() const
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
#ifndef __MWERKS__
operator const_pointer() const
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
#endif /* !__MWERKS__ */
iterator_self_type next()
{
iterator_self_type copy(*this);
return ++copy;
}
const iterator_self_type next() const
{
iterator_self_type copy(*this);
return ++copy;
}
iterator_self_type prev()
{
iterator_self_type copy(*this);
return --copy;
}
const iterator_self_type prev() const
{
iterator_self_type copy(*this);
return --copy;
}
// Passing by value rather than by reference and reference to const
// to keep AIX happy.
bool operator==(const iterator_self_type aOther) const
{
MOZ_ASSERT(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
bool operator!=(const iterator_self_type aOther) const
{
MOZ_ASSERT(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent != aOther.mCurrent;
}
bool operator==(const iterator_self_type aOther)
{
MOZ_ASSERT(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
bool operator!=(const iterator_self_type aOther)
{
MOZ_ASSERT(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent != aOther.mCurrent;
}
private:
link_type *mCurrent;
#ifdef DEBUG
link_type *mListLink; // the list's link, i.e., the end
#endif
};
class nsLineList_reverse_iterator {
public:
friend class nsLineList;
friend class nsLineList_iterator;
friend class nsLineList_const_iterator;
friend class nsLineList_const_reverse_iterator;
typedef nsLineList_reverse_iterator iterator_self_type;
typedef nsLineList_iterator iterator_reverse_type;
typedef nsLineBox& reference;
typedef const nsLineBox& const_reference;
typedef nsLineBox* pointer;
typedef const nsLineBox* const_pointer;
typedef uint32_t size_type;
typedef int32_t difference_type;
typedef nsLineLink link_type;
#ifdef DEBUG
nsLineList_reverse_iterator() { memset(&mCurrent, 0xcd, sizeof(mCurrent)); }
#else
// Auto generated default constructor OK.
#endif
// Auto generated copy-constructor OK.
inline iterator_self_type&
operator=(const iterator_reverse_type& aOther);
inline iterator_self_type&
operator=(const iterator_self_type& aOther);
iterator_self_type& operator++()
{
mCurrent = mCurrent->_mPrev;
return *this;
}
iterator_self_type operator++(int)
{
iterator_self_type rv(*this);
mCurrent = mCurrent->_mPrev;
return rv;
}
iterator_self_type& operator--()
{
mCurrent = mCurrent->_mNext;
return *this;
}
iterator_self_type operator--(int)
{
iterator_self_type rv(*this);
mCurrent = mCurrent->_mNext;
return rv;
}
reference operator*()
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return *static_cast<pointer>(mCurrent);
}
pointer operator->()
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<pointer>(mCurrent);
}
pointer get()
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<pointer>(mCurrent);
}
operator pointer()
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<pointer>(mCurrent);
}
const_reference operator*() const
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return *static_cast<const_pointer>(mCurrent);
}
const_pointer operator->() const
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
#ifndef __MWERKS__
operator const_pointer() const
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
#endif /* !__MWERKS__ */
// Passing by value rather than by reference and reference to const
// to keep AIX happy.
bool operator==(const iterator_self_type aOther) const
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
bool operator!=(const iterator_self_type aOther) const
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent != aOther.mCurrent;
}
bool operator==(const iterator_self_type aOther)
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
bool operator!=(const iterator_self_type aOther)
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent != aOther.mCurrent;
}
private:
link_type *mCurrent;
#ifdef DEBUG
link_type *mListLink; // the list's link, i.e., the end
#endif
};
class nsLineList_const_iterator {
public:
friend class nsLineList;
friend class nsLineList_iterator;
friend class nsLineList_reverse_iterator;
friend class nsLineList_const_reverse_iterator;
typedef nsLineList_const_iterator iterator_self_type;
typedef nsLineList_const_reverse_iterator iterator_reverse_type;
typedef nsLineList_iterator iterator_nonconst_type;
typedef nsLineList_reverse_iterator iterator_nonconst_reverse_type;
typedef nsLineBox& reference;
typedef const nsLineBox& const_reference;
typedef nsLineBox* pointer;
typedef const nsLineBox* const_pointer;
typedef uint32_t size_type;
typedef int32_t difference_type;
typedef nsLineLink link_type;
#ifdef DEBUG
nsLineList_const_iterator() { memset(&mCurrent, 0xcd, sizeof(mCurrent)); }
#else
// Auto generated default constructor OK.
#endif
// Auto generated copy-constructor OK.
inline iterator_self_type&
operator=(const iterator_nonconst_type& aOther);
inline iterator_self_type&
operator=(const iterator_nonconst_reverse_type& aOther);
inline iterator_self_type&
operator=(const iterator_self_type& aOther);
inline iterator_self_type&
operator=(const iterator_reverse_type& aOther);
iterator_self_type& operator++()
{
mCurrent = mCurrent->_mNext;
return *this;
}
iterator_self_type operator++(int)
{
iterator_self_type rv(*this);
mCurrent = mCurrent->_mNext;
return rv;
}
iterator_self_type& operator--()
{
mCurrent = mCurrent->_mPrev;
return *this;
}
iterator_self_type operator--(int)
{
iterator_self_type rv(*this);
mCurrent = mCurrent->_mPrev;
return rv;
}
const_reference operator*() const
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return *static_cast<const_pointer>(mCurrent);
}
const_pointer operator->() const
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
const_pointer get() const
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
#ifndef __MWERKS__
operator const_pointer() const
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
#endif /* !__MWERKS__ */
const iterator_self_type next() const
{
iterator_self_type copy(*this);
return ++copy;
}
const iterator_self_type prev() const
{
iterator_self_type copy(*this);
return --copy;
}
// Passing by value rather than by reference and reference to const
// to keep AIX happy.
bool operator==(const iterator_self_type aOther) const
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
bool operator!=(const iterator_self_type aOther) const
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent != aOther.mCurrent;
}
bool operator==(const iterator_self_type aOther)
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
bool operator!=(const iterator_self_type aOther)
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent != aOther.mCurrent;
}
private:
const link_type *mCurrent;
#ifdef DEBUG
const link_type *mListLink; // the list's link, i.e., the end
#endif
};
class nsLineList_const_reverse_iterator {
public:
friend class nsLineList;
friend class nsLineList_iterator;
friend class nsLineList_reverse_iterator;
friend class nsLineList_const_iterator;
typedef nsLineList_const_reverse_iterator iterator_self_type;
typedef nsLineList_const_iterator iterator_reverse_type;
typedef nsLineList_iterator iterator_nonconst_reverse_type;
typedef nsLineList_reverse_iterator iterator_nonconst_type;
typedef nsLineBox& reference;
typedef const nsLineBox& const_reference;
typedef nsLineBox* pointer;
typedef const nsLineBox* const_pointer;
typedef uint32_t size_type;
typedef int32_t difference_type;
typedef nsLineLink link_type;
#ifdef DEBUG
nsLineList_const_reverse_iterator() { memset(&mCurrent, 0xcd, sizeof(mCurrent)); }
#else
// Auto generated default constructor OK.
#endif
// Auto generated copy-constructor OK.
inline iterator_self_type&
operator=(const iterator_nonconst_type& aOther);
inline iterator_self_type&
operator=(const iterator_nonconst_reverse_type& aOther);
inline iterator_self_type&
operator=(const iterator_self_type& aOther);
inline iterator_self_type&
operator=(const iterator_reverse_type& aOther);
iterator_self_type& operator++()
{
mCurrent = mCurrent->_mPrev;
return *this;
}
iterator_self_type operator++(int)
{
iterator_self_type rv(*this);
mCurrent = mCurrent->_mPrev;
return rv;
}
iterator_self_type& operator--()
{
mCurrent = mCurrent->_mNext;
return *this;
}
iterator_self_type operator--(int)
{
iterator_self_type rv(*this);
mCurrent = mCurrent->_mNext;
return rv;
}
const_reference operator*() const
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return *static_cast<const_pointer>(mCurrent);
}
const_pointer operator->() const
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
const_pointer get() const
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
#ifndef __MWERKS__
operator const_pointer() const
{
MOZ_ASSERT(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
#endif /* !__MWERKS__ */
// Passing by value rather than by reference and reference to const
// to keep AIX happy.
bool operator==(const iterator_self_type aOther) const
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
bool operator!=(const iterator_self_type aOther) const
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent != aOther.mCurrent;
}
bool operator==(const iterator_self_type aOther)
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
bool operator!=(const iterator_self_type aOther)
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent != aOther.mCurrent;
}
//private:
const link_type *mCurrent;
#ifdef DEBUG
const link_type *mListLink; // the list's link, i.e., the end
#endif
};
class nsLineList {
public:
friend class nsLineList_iterator;
friend class nsLineList_reverse_iterator;
friend class nsLineList_const_iterator;
friend class nsLineList_const_reverse_iterator;
typedef uint32_t size_type;
typedef int32_t difference_type;
typedef nsLineLink link_type;
private:
link_type mLink;
public:
typedef nsLineList self_type;
typedef nsLineBox& reference;
typedef const nsLineBox& const_reference;
typedef nsLineBox* pointer;
typedef const nsLineBox* const_pointer;
typedef nsLineList_iterator iterator;
typedef nsLineList_reverse_iterator reverse_iterator;
typedef nsLineList_const_iterator const_iterator;
typedef nsLineList_const_reverse_iterator const_reverse_iterator;
nsLineList()
{
MOZ_COUNT_CTOR(nsLineList);
clear();
}
~nsLineList()
{
MOZ_COUNT_DTOR(nsLineList);
}
const_iterator begin() const
{
const_iterator rv;
rv.mCurrent = mLink._mNext;
#ifdef DEBUG
rv.mListLink = &mLink;
#endif
return rv;
}
iterator begin()
{
iterator rv;
rv.mCurrent = mLink._mNext;
#ifdef DEBUG
rv.mListLink = &mLink;
#endif
return rv;
}
iterator begin(nsLineBox* aLine)
{
iterator rv;
rv.mCurrent = aLine;
#ifdef DEBUG
rv.mListLink = &mLink;
#endif
return rv;
}
const_iterator end() const
{
const_iterator rv;
rv.mCurrent = &mLink;
#ifdef DEBUG
rv.mListLink = &mLink;
#endif
return rv;
}
iterator end()
{
iterator rv;
rv.mCurrent = &mLink;
#ifdef DEBUG
rv.mListLink = &mLink;
#endif
return rv;
}
const_reverse_iterator rbegin() const
{
const_reverse_iterator rv;
rv.mCurrent = mLink._mPrev;
#ifdef DEBUG
rv.mListLink = &mLink;
#endif
return rv;
}
reverse_iterator rbegin()
{
reverse_iterator rv;
rv.mCurrent = mLink._mPrev;
#ifdef DEBUG
rv.mListLink = &mLink;
#endif
return rv;
}
reverse_iterator rbegin(nsLineBox* aLine)
{
reverse_iterator rv;
rv.mCurrent = aLine;
#ifdef DEBUG
rv.mListLink = &mLink;
#endif
return rv;
}
const_reverse_iterator rend() const
{
const_reverse_iterator rv;
rv.mCurrent = &mLink;
#ifdef DEBUG
rv.mListLink = &mLink;
#endif
return rv;
}
reverse_iterator rend()
{
reverse_iterator rv;
rv.mCurrent = &mLink;
#ifdef DEBUG
rv.mListLink = &mLink;
#endif
return rv;
}
bool empty() const
{
return mLink._mNext == &mLink;
}
// NOTE: O(N).
size_type size() const
{
size_type count = 0;
for (const link_type *cur = mLink._mNext;
cur != &mLink;
cur = cur->_mNext)
{
++count;
}
return count;
}
pointer front()
{
NS_ASSERTION(!empty(), "no element to return");
return static_cast<pointer>(mLink._mNext);
}
const_pointer front() const
{
NS_ASSERTION(!empty(), "no element to return");
return static_cast<const_pointer>(mLink._mNext);
}
pointer back()
{
NS_ASSERTION(!empty(), "no element to return");
return static_cast<pointer>(mLink._mPrev);
}
const_pointer back() const
{
NS_ASSERTION(!empty(), "no element to return");
return static_cast<const_pointer>(mLink._mPrev);
}
void push_front(pointer aNew)
{
aNew->_mNext = mLink._mNext;
mLink._mNext->_mPrev = aNew;
aNew->_mPrev = &mLink;
mLink._mNext = aNew;
}
void pop_front()
// NOTE: leaves dangling next/prev pointers
{
NS_ASSERTION(!empty(), "no element to pop");
link_type *newFirst = mLink._mNext->_mNext;
newFirst->_mPrev = &mLink;
// mLink._mNext->_mNext = nullptr;
// mLink._mNext->_mPrev = nullptr;
mLink._mNext = newFirst;
}
void push_back(pointer aNew)
{
aNew->_mPrev = mLink._mPrev;
mLink._mPrev->_mNext = aNew;
aNew->_mNext = &mLink;
mLink._mPrev = aNew;
}
void pop_back()
// NOTE: leaves dangling next/prev pointers
{
NS_ASSERTION(!empty(), "no element to pop");
link_type *newLast = mLink._mPrev->_mPrev;
newLast->_mNext = &mLink;
// mLink._mPrev->_mPrev = nullptr;
// mLink._mPrev->_mNext = nullptr;
mLink._mPrev = newLast;
}
// inserts x before position
iterator before_insert(iterator position, pointer x)
{
// use |mCurrent| to prevent DEBUG_PASS_END assertions
x->_mPrev = position.mCurrent->_mPrev;
x->_mNext = position.mCurrent;
position.mCurrent->_mPrev->_mNext = x;
position.mCurrent->_mPrev = x;
return --position;
}
// inserts x after position
iterator after_insert(iterator position, pointer x)
{
// use |mCurrent| to prevent DEBUG_PASS_END assertions
x->_mNext = position.mCurrent->_mNext;
x->_mPrev = position.mCurrent;
position.mCurrent->_mNext->_mPrev = x;
position.mCurrent->_mNext = x;
return ++position;
}
// returns iterator pointing to after the element
iterator erase(iterator position)
// NOTE: leaves dangling next/prev pointers
{
position->_mPrev->_mNext = position->_mNext;
position->_mNext->_mPrev = position->_mPrev;
return ++position;
}
void swap(self_type& y)
{
link_type tmp(y.mLink);
y.mLink = mLink;
mLink = tmp;
if (!empty()) {
mLink._mNext->_mPrev = &mLink;
mLink._mPrev->_mNext = &mLink;
}
if (!y.empty()) {
y.mLink._mNext->_mPrev = &y.mLink;
y.mLink._mPrev->_mNext = &y.mLink;
}
}
void clear()
// NOTE: leaves dangling next/prev pointers
{
mLink._mNext = &mLink;
mLink._mPrev = &mLink;
}
// inserts the conts of x before position and makes x empty
void splice(iterator position, self_type& x)
{
// use |mCurrent| to prevent DEBUG_PASS_END assertions
position.mCurrent->_mPrev->_mNext = x.mLink._mNext;
x.mLink._mNext->_mPrev = position.mCurrent->_mPrev;
x.mLink._mPrev->_mNext = position.mCurrent;
position.mCurrent->_mPrev = x.mLink._mPrev;
x.clear();
}
// Inserts element *i from list x before position and removes
// it from x.
void splice(iterator position, self_type& x, iterator i)
{
NS_ASSERTION(!x.empty(), "Can't insert from empty list.");
NS_ASSERTION(position != i && position.mCurrent != i->_mNext,
"We don't check for this case.");
// remove from |x|
i->_mPrev->_mNext = i->_mNext;
i->_mNext->_mPrev = i->_mPrev;
// use |mCurrent| to prevent DEBUG_PASS_END assertions
// link into |this|, before-side
i->_mPrev = position.mCurrent->_mPrev;
position.mCurrent->_mPrev->_mNext = i.get();
// link into |this|, after-side
i->_mNext = position.mCurrent;
position.mCurrent->_mPrev = i.get();
}
// Inserts elements in [|first|, |last|), which are in |x|,
// into |this| before |position| and removes them from |x|.
void splice(iterator position, self_type& x, iterator first,
iterator last)
{
NS_ASSERTION(!x.empty(), "Can't insert from empty list.");
if (first == last)
return;
--last; // so we now want to move [first, last]
// remove from |x|
first->_mPrev->_mNext = last->_mNext;
last->_mNext->_mPrev = first->_mPrev;
// use |mCurrent| to prevent DEBUG_PASS_END assertions
// link into |this|, before-side
first->_mPrev = position.mCurrent->_mPrev;
position.mCurrent->_mPrev->_mNext = first.get();
// link into |this|, after-side
last->_mNext = position.mCurrent;
position.mCurrent->_mPrev = last.get();
}
};
// Many of these implementations of operator= don't work yet. I don't
// know why.
#ifdef DEBUG
// NOTE: ASSIGN_FROM is meant to be used *only* as the entire body
// of a function and therefore lacks PR_{BEGIN,END}_MACRO
#define ASSIGN_FROM(other_) \
mCurrent = other_.mCurrent; \
mListLink = other_.mListLink; \
return *this;
#else /* !NS_LINELIST_DEBUG_PASS_END */
#define ASSIGN_FROM(other_) \
mCurrent = other_.mCurrent; \
return *this;
#endif /* !NS_LINELIST_DEBUG_PASS_END */
inline
nsLineList_iterator&
nsLineList_iterator::operator=(const nsLineList_iterator& aOther)
{
ASSIGN_FROM(aOther)
}
inline
nsLineList_iterator&
nsLineList_iterator::operator=(const nsLineList_reverse_iterator& aOther)
{
ASSIGN_FROM(aOther)
}
inline
nsLineList_reverse_iterator&
nsLineList_reverse_iterator::operator=(const nsLineList_iterator& aOther)
{
ASSIGN_FROM(aOther)
}
inline
nsLineList_reverse_iterator&
nsLineList_reverse_iterator::operator=(const nsLineList_reverse_iterator& aOther)
{
ASSIGN_FROM(aOther)
}
inline
nsLineList_const_iterator&
nsLineList_const_iterator::operator=(const nsLineList_iterator& aOther)
{
ASSIGN_FROM(aOther)
}
inline
nsLineList_const_iterator&
nsLineList_const_iterator::operator=(const nsLineList_reverse_iterator& aOther)
{
ASSIGN_FROM(aOther)
}
inline
nsLineList_const_iterator&
nsLineList_const_iterator::operator=(const nsLineList_const_iterator& aOther)
{
ASSIGN_FROM(aOther)
}
inline
nsLineList_const_iterator&
nsLineList_const_iterator::operator=(const nsLineList_const_reverse_iterator& aOther)
{
ASSIGN_FROM(aOther)
}
inline
nsLineList_const_reverse_iterator&
nsLineList_const_reverse_iterator::operator=(const nsLineList_iterator& aOther)
{
ASSIGN_FROM(aOther)
}
inline
nsLineList_const_reverse_iterator&
nsLineList_const_reverse_iterator::operator=(const nsLineList_reverse_iterator& aOther)
{
ASSIGN_FROM(aOther)
}
inline
nsLineList_const_reverse_iterator&
nsLineList_const_reverse_iterator::operator=(const nsLineList_const_iterator& aOther)
{
ASSIGN_FROM(aOther)
}
inline
nsLineList_const_reverse_iterator&
nsLineList_const_reverse_iterator::operator=(const nsLineList_const_reverse_iterator& aOther)
{
ASSIGN_FROM(aOther)
}
//----------------------------------------------------------------------
class nsLineIterator final : public nsILineIterator
{
public:
nsLineIterator();
~nsLineIterator();
virtual void DisposeLineIterator() override;
virtual int32_t GetNumLines() override;
virtual bool GetDirection() override;
NS_IMETHOD GetLine(int32_t aLineNumber,
nsIFrame** aFirstFrameOnLine,
int32_t* aNumFramesOnLine,
nsRect& aLineBounds) override;
virtual int32_t FindLineContaining(nsIFrame* aFrame, int32_t aStartLine = 0) override;
NS_IMETHOD FindFrameAt(int32_t aLineNumber,
nsPoint aPos,
nsIFrame** aFrameFound,
bool* aPosIsBeforeFirstFrame,
bool* aPosIsAfterLastFrame) override;
NS_IMETHOD GetNextSiblingOnLine(nsIFrame*& aFrame, int32_t aLineNumber) override;
NS_IMETHOD CheckLineOrder(int32_t aLine,
bool *aIsReordered,
nsIFrame **aFirstVisual,
nsIFrame **aLastVisual) override;
nsresult Init(nsLineList& aLines, bool aRightToLeft);
private:
nsLineBox* PrevLine() {
if (0 == mIndex) {
return nullptr;
}
return mLines[--mIndex];
}
nsLineBox* NextLine() {
if (mIndex >= mNumLines - 1) {
return nullptr;
}
return mLines[++mIndex];
}
nsLineBox* LineAt(int32_t aIndex) {
if ((aIndex < 0) || (aIndex >= mNumLines)) {
return nullptr;
}
return mLines[aIndex];
}
nsLineBox** mLines;
int32_t mIndex;
int32_t mNumLines;
bool mRightToLeft;
};
#endif /* nsLineBox_h___ */
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