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gecko/layout/generic/nsLineBox.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:
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* L. David Baron <dbaron@dbaron.org>
* Mats Palmgren <mats.palmgren@bredband.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* representation of one line within a block frame, a CSS line box */
#ifndef nsLineBox_h___
#define nsLineBox_h___
#include "nsILineIterator.h"
#include "nsIFrame.h"
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(nsnull) { }
#endif
~nsFloatCacheList();
PRBool IsEmpty() const {
return nsnull == mHead;
}
PRBool NotEmpty() const {
return nsnull != 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 nsnull 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(nsnull) { }
~nsFloatCacheFreeList() { }
#endif
// Reimplement trivial functions
PRBool IsEmpty() const {
return nsnull == mHead;
}
nsFloatCache* Head() const {
return mHead;
}
nsFloatCache* Tail() const {
return mTail;
}
PRBool NotEmpty() const {
return nsnull != 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_BREAK_TYPE ((1 << 4) - 1)
#define LINE_MAX_CHILD_COUNT ((1 << 20) - 1)
#if NS_STYLE_CLEAR_LAST_VALUE > 15
need to rearrange the mBits bitfield;
#endif
// Funtion to create a line box
nsLineBox* NS_NewLineBox(nsIPresShell* aPresShell, nsIFrame* aFrame,
PRInt32 aCount, PRBool aIsBlock);
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 : public nsLineLink {
private:
nsLineBox(nsIFrame* aFrame, PRInt32 aCount, PRBool aIsBlock);
~nsLineBox();
// Overloaded new operator. Uses an arena (which comes from the presShell)
// to perform the allocation.
void* operator new(size_t sz, nsIPresShell* aPresShell) CPP_THROW_NEW;
void operator delete(void* aPtr, size_t sz);
public:
// Use these two functions to allocate and destroy line boxes
friend nsLineBox* NS_NewLineBox(nsIPresShell* aPresShell, nsIFrame* aFrame,
PRInt32 aCount, PRBool aIsBlock);
void Destroy(nsIPresShell* aPresShell);
// mBlock bit
PRBool IsBlock() const {
return mFlags.mBlock;
}
PRBool IsInline() const {
return 0 == mFlags.mBlock;
}
// mDirty bit
void MarkDirty() {
mFlags.mDirty = 1;
}
void ClearDirty() {
mFlags.mDirty = 0;
}
PRBool IsDirty() const {
return mFlags.mDirty;
}
// mPreviousMarginDirty bit
void MarkPreviousMarginDirty() {
mFlags.mPreviousMarginDirty = 1;
}
void ClearPreviousMarginDirty() {
mFlags.mPreviousMarginDirty = 0;
}
PRBool IsPreviousMarginDirty() const {
return mFlags.mPreviousMarginDirty;
}
// mHasClearance bit
void SetHasClearance() {
mFlags.mHasClearance = 1;
}
void ClearHasClearance() {
mFlags.mHasClearance = 0;
}
PRBool HasClearance() const {
return mFlags.mHasClearance;
}
// mImpactedByFloat bit
void SetLineIsImpactedByFloat(PRBool aValue) {
NS_ASSERTION((PR_FALSE==aValue || PR_TRUE==aValue), "somebody is playing fast and loose with bools and bits!");
mFlags.mImpactedByFloat = aValue;
}
PRBool IsImpactedByFloat() const {
return mFlags.mImpactedByFloat;
}
// mLineWrapped bit
void SetLineWrapped(PRBool aOn) {
NS_ASSERTION((PR_FALSE==aOn || PR_TRUE==aOn), "somebody is playing fast and loose with bools and bits!");
mFlags.mLineWrapped = aOn;
}
PRBool IsLineWrapped() const {
return mFlags.mLineWrapped;
}
// mInvalidateTextRuns bit
void SetInvalidateTextRuns(PRBool aOn) {
NS_ASSERTION((PR_FALSE==aOn || PR_TRUE==aOn), "somebody is playing fast and loose with bools and bits!");
mFlags.mInvalidateTextRuns = aOn;
}
PRBool GetInvalidateTextRuns() const {
return mFlags.mInvalidateTextRuns;
}
// mResizeReflowOptimizationDisabled bit
void DisableResizeReflowOptimization() {
mFlags.mResizeReflowOptimizationDisabled = PR_TRUE;
}
void EnableResizeReflowOptimization() {
mFlags.mResizeReflowOptimizationDisabled = PR_FALSE;
}
PRBool ResizeReflowOptimizationDisabled() const {
return mFlags.mResizeReflowOptimizationDisabled;
}
// mHasBullet bit
void SetHasBullet() {
mFlags.mHasBullet = PR_TRUE;
InvalidateCachedIsEmpty();
}
void ClearHasBullet() {
mFlags.mHasBullet = PR_FALSE;
InvalidateCachedIsEmpty();
}
PRBool HasBullet() const {
return mFlags.mHasBullet;
}
// mChildCount value
PRInt32 GetChildCount() const {
return (PRInt32) mFlags.mChildCount;
}
void SetChildCount(PRInt32 aNewCount) {
if (aNewCount < 0) {
NS_WARNING("negative child count");
aNewCount = 0;
}
if (aNewCount > LINE_MAX_CHILD_COUNT) {
aNewCount = LINE_MAX_CHILD_COUNT;
}
mFlags.mChildCount = aNewCount;
}
// 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.
PRBool HasBreakBefore() const {
return IsBlock() && NS_STYLE_CLEAR_NONE != mFlags.mBreakType;
}
void SetBreakTypeBefore(PRUint8 aBreakType) {
NS_ASSERTION(IsBlock(), "Only blocks have break-before");
NS_ASSERTION(aBreakType <= NS_STYLE_CLEAR_LEFT_AND_RIGHT,
"Only float break types are allowed before a line");
mFlags.mBreakType = aBreakType;
}
PRUint8 GetBreakTypeBefore() const {
return IsBlock() ? mFlags.mBreakType : NS_STYLE_CLEAR_NONE;
}
PRBool HasBreakAfter() const {
return !IsBlock() && NS_STYLE_CLEAR_NONE != mFlags.mBreakType;
}
void SetBreakTypeAfter(PRUint8 aBreakType) {
NS_ASSERTION(!IsBlock(), "Only inlines have break-after");
NS_ASSERTION(aBreakType <= LINE_MAX_BREAK_TYPE, "bad break type");
mFlags.mBreakType = aBreakType;
}
PRBool HasFloatBreakAfter() const {
return !IsBlock() && (NS_STYLE_CLEAR_LEFT == mFlags.mBreakType ||
NS_STYLE_CLEAR_RIGHT == mFlags.mBreakType ||
NS_STYLE_CLEAR_LEFT_AND_RIGHT == mFlags.mBreakType);
}
PRUint8 GetBreakTypeAfter() const {
return !IsBlock() ? mFlags.mBreakType : NS_STYLE_CLEAR_NONE;
}
// mCarriedOutBottomMargin value
nsCollapsingMargin GetCarriedOutBottomMargin() const;
// Returns PR_TRUE if the margin changed
PRBool SetCarriedOutBottomMargin(nsCollapsingMargin aValue);
// mFloats
PRBool HasFloats() const {
return (IsInline() && mInlineData) && mInlineData->mFloats.NotEmpty();
}
nsFloatCache* GetFirstFloat();
void FreeFloats(nsFloatCacheFreeList& aFreeList);
void AppendFloats(nsFloatCacheFreeList& aFreeList);
PRBool 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 SetCombinedArea(const nsRect& aCombinedArea);
nsRect GetCombinedArea() {
return mData ? mData->mCombinedArea : mBounds;
}
PRBool CombinedAreaIntersects(const nsRect& aDamageRect) {
nsRect* ca = (mData ? &mData->mCombinedArea : &mBounds);
return !((ca->YMost() <= aDamageRect.y) ||
(ca->y >= aDamageRect.YMost()));
}
void SlideBy(nscoord aDY) {
mBounds.y += aDY;
if (mData) {
mData->mCombinedArea.y += aDY;
}
}
/**
* The ascent (distance from top to baseline) of the linebox is the
* 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 GetAscent() const { return mAscent; }
void SetAscent(nscoord aAscent) { mAscent = aAscent; }
nscoord GetHeight() const {
return mBounds.height;
}
static void DeleteLineList(nsPresContext* aPresContext, nsLineList& aLines);
// search from beginning to end
// XXX Should switch to API below
static nsLineBox* FindLineContaining(nsLineList& aLines, nsIFrame* aFrame,
PRInt32* aFrameIndexInLine);
// search from end to beginning of [aBegin, aEnd)
// Returns PR_TRUE if it found the line and PR_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 PRBool RFindLineContaining(nsIFrame* aFrame,
const nsLineList_iterator& aBegin,
nsLineList_iterator& aEnd,
nsIFrame* aLastFrameBeforeEnd,
PRInt32* aFrameIndexInLine);
#ifdef DEBUG
char* StateToString(char* aBuf, PRInt32 aBufSize) const;
void List(FILE* out, PRInt32 aIndent) const;
#endif
nsIFrame* LastChild() const;
PRBool IsLastChild(nsIFrame* aFrame) const;
PRInt32 IndexOf(nsIFrame* aFrame) const;
PRBool Contains(nsIFrame* aFrame) const {
return IndexOf(aFrame) >= 0;
}
// whether the line box is "logically" empty (just like nsIFrame::IsEmpty)
PRBool 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.
PRBool CachedIsEmpty();
void InvalidateCachedIsEmpty() {
mFlags.mEmptyCacheValid = PR_FALSE;
}
// For debugging purposes
PRBool IsValidCachedIsEmpty() {
return mFlags.mEmptyCacheValid;
}
#ifdef DEBUG
static PRInt32 GetCtorCount();
#endif
nsIFrame* mFirstChild;
nsRect mBounds;
struct FlagBits {
PRUint32 mDirty : 1;
PRUint32 mPreviousMarginDirty : 1;
PRUint32 mHasClearance : 1;
PRUint32 mBlock : 1;
PRUint32 mImpactedByFloat : 1;
PRUint32 mLineWrapped: 1;
PRUint32 mInvalidateTextRuns : 1;
PRUint32 mResizeReflowOptimizationDisabled: 1; // default 0 = means that the opt potentially applies to this line. 1 = never skip reflowing this line for a resize reflow
PRUint32 mEmptyCacheValid: 1;
PRUint32 mEmptyCacheState: 1;
// mHasBullet indicates that this is an inline line whose block's
// bullet is adjacent to this line and non-empty.
PRUint32 mHasBullet : 1;
PRUint32 mBreakType : 4;
PRUint32 mChildCount : 17;
};
struct ExtraData {
ExtraData(const nsRect& aBounds) : mCombinedArea(aBounds) {
}
nsRect mCombinedArea;
};
struct ExtraBlockData : public ExtraData {
ExtraBlockData(const nsRect& aBounds)
: ExtraData(aBounds),
mCarriedOutBottomMargin()
{
}
nsCollapsingMargin mCarriedOutBottomMargin;
};
struct ExtraInlineData : public ExtraData {
ExtraInlineData(const nsRect& aBounds) : ExtraData(aBounds) {
}
nsFloatCacheList mFloats;
};
protected:
nscoord mAscent; // see |SetAscent| / |GetAscent|
union {
PRUint32 mAllFlags;
FlagBits mFlags;
};
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 PRUint32 size_type;
typedef PRInt32 difference_type;
typedef nsLineLink link_type;
#ifdef NS_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*()
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return *static_cast<pointer>(mCurrent);
}
pointer operator->()
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return static_cast<pointer>(mCurrent);
}
pointer get()
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return static_cast<pointer>(mCurrent);
}
operator pointer()
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return static_cast<pointer>(mCurrent);
}
const_reference operator*() const
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return *static_cast<const_pointer>(mCurrent);
}
const_pointer operator->() const
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
#ifndef __MWERKS__
operator const_pointer() const
{
NS_ABORT_IF_FALSE(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.
PRBool operator==(const iterator_self_type aOther) const
{
NS_ABORT_IF_FALSE(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
PRBool operator!=(const iterator_self_type aOther) const
{
NS_ABORT_IF_FALSE(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent != aOther.mCurrent;
}
PRBool operator==(const iterator_self_type aOther)
{
NS_ABORT_IF_FALSE(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
PRBool operator!=(const iterator_self_type aOther)
{
NS_ABORT_IF_FALSE(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 PRUint32 size_type;
typedef PRInt32 difference_type;
typedef nsLineLink link_type;
#ifdef NS_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*()
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return *static_cast<pointer>(mCurrent);
}
pointer operator->()
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return static_cast<pointer>(mCurrent);
}
pointer get()
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return static_cast<pointer>(mCurrent);
}
operator pointer()
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return static_cast<pointer>(mCurrent);
}
const_reference operator*() const
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return *static_cast<const_pointer>(mCurrent);
}
const_pointer operator->() const
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
#ifndef __MWERKS__
operator const_pointer() const
{
NS_ABORT_IF_FALSE(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.
PRBool operator==(const iterator_self_type aOther) const
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
PRBool operator!=(const iterator_self_type aOther) const
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent != aOther.mCurrent;
}
PRBool operator==(const iterator_self_type aOther)
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
PRBool 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 PRUint32 size_type;
typedef PRInt32 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
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return *static_cast<const_pointer>(mCurrent);
}
const_pointer operator->() const
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
const_pointer get() const
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
#ifndef __MWERKS__
operator const_pointer() const
{
NS_ABORT_IF_FALSE(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.
PRBool operator==(const iterator_self_type aOther) const
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
PRBool operator!=(const iterator_self_type aOther) const
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent != aOther.mCurrent;
}
PRBool operator==(const iterator_self_type aOther)
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
PRBool 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 PRUint32 size_type;
typedef PRInt32 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
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return *static_cast<const_pointer>(mCurrent);
}
const_pointer operator->() const
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
const_pointer get() const
{
NS_ABORT_IF_FALSE(mCurrent != mListLink, "running past end");
return static_cast<const_pointer>(mCurrent);
}
#ifndef __MWERKS__
operator const_pointer() const
{
NS_ABORT_IF_FALSE(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.
PRBool operator==(const iterator_self_type aOther) const
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
PRBool operator!=(const iterator_self_type aOther) const
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent != aOther.mCurrent;
}
PRBool operator==(const iterator_self_type aOther)
{
NS_ASSERTION(mListLink == aOther.mListLink, "comparing iterators over different lists");
return mCurrent == aOther.mCurrent;
}
PRBool 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 PRUint32 size_type;
typedef PRInt32 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;
}
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;
}
PRBool 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 = nsnull;
// mLink._mNext->_mPrev = nsnull;
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 = nsnull;
// mLink._mPrev->_mNext = nsnull;
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;
}
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 NS_FINAL_CLASS nsLineIterator : public nsILineIterator
{
public:
nsLineIterator();
~nsLineIterator();
virtual void DisposeLineIterator();
virtual PRInt32 GetNumLines();
virtual PRBool GetDirection();
NS_IMETHOD GetLine(PRInt32 aLineNumber,
nsIFrame** aFirstFrameOnLine,
PRInt32* aNumFramesOnLine,
nsRect& aLineBounds,
PRUint32* aLineFlags);
virtual PRInt32 FindLineContaining(nsIFrame* aFrame);
virtual PRInt32 FindLineAt(nscoord aY);
NS_IMETHOD FindFrameAt(PRInt32 aLineNumber,
nscoord aX,
nsIFrame** aFrameFound,
PRBool* aXIsBeforeFirstFrame,
PRBool* aXIsAfterLastFrame);
NS_IMETHOD GetNextSiblingOnLine(nsIFrame*& aFrame, PRInt32 aLineNumber);
#ifdef IBMBIDI
NS_IMETHOD CheckLineOrder(PRInt32 aLine,
PRBool *aIsReordered,
nsIFrame **aFirstVisual,
nsIFrame **aLastVisual);
#endif
nsresult Init(nsLineList& aLines, PRBool aRightToLeft);
private:
nsLineBox* PrevLine() {
if (0 == mIndex) {
return nsnull;
}
return mLines[--mIndex];
}
nsLineBox* NextLine() {
if (mIndex >= mNumLines - 1) {
return nsnull;
}
return mLines[++mIndex];
}
nsLineBox* LineAt(PRInt32 aIndex) {
if ((aIndex < 0) || (aIndex >= mNumLines)) {
return nsnull;
}
return mLines[aIndex];
}
nsLineBox** mLines;
PRInt32 mIndex;
PRInt32 mNumLines;
PRPackedBool mRightToLeft;
};
#endif /* nsLineBox_h___ */
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