зеркало из https://github.com/mozilla/gecko-dev.git
574 строки
17 KiB
C++
574 строки
17 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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/. */
|
|
|
|
#ifndef nsFrameList_h___
|
|
#define nsFrameList_h___
|
|
|
|
#include <stdio.h> /* for FILE* */
|
|
#include "nsDebug.h"
|
|
#include "nsTArrayForwardDeclare.h"
|
|
#include "mozilla/ReverseIterator.h"
|
|
|
|
#if defined(DEBUG) || defined(MOZ_DUMP_PAINTING)
|
|
// DEBUG_FRAME_DUMP enables nsIFrame::List and related methods.
|
|
// You can also define this in a non-DEBUG build if you need frame dumps.
|
|
#define DEBUG_FRAME_DUMP 1
|
|
#endif
|
|
|
|
class nsContainerFrame;
|
|
class nsIFrame;
|
|
class nsIPresShell;
|
|
class nsPresContext;
|
|
|
|
namespace mozilla {
|
|
namespace layout {
|
|
class FrameChildList;
|
|
enum FrameChildListID {
|
|
// The individual concrete child lists.
|
|
kPrincipalList = 0x1,
|
|
kPopupList = 0x2,
|
|
kCaptionList = 0x4,
|
|
kColGroupList = 0x8,
|
|
kSelectPopupList = 0x10,
|
|
kAbsoluteList = 0x20,
|
|
kFixedList = 0x40,
|
|
kOverflowList = 0x80,
|
|
kOverflowContainersList = 0x100,
|
|
kExcessOverflowContainersList = 0x200,
|
|
kOverflowOutOfFlowList = 0x400,
|
|
kFloatList = 0x800,
|
|
kBulletList = 0x1000,
|
|
kPushedFloatsList = 0x2000,
|
|
// A special alias for kPrincipalList that suppress the reflow request that
|
|
// is normally done when manipulating child lists.
|
|
kNoReflowPrincipalList = 0x4000
|
|
};
|
|
} // namespace layout
|
|
} // namespace mozilla
|
|
|
|
// Uncomment this to enable expensive frame-list integrity checking
|
|
// #define DEBUG_FRAME_LIST
|
|
|
|
/**
|
|
* A class for managing a list of frames.
|
|
*/
|
|
class nsFrameList {
|
|
public:
|
|
nsFrameList() :
|
|
mFirstChild(nullptr), mLastChild(nullptr)
|
|
{
|
|
}
|
|
|
|
nsFrameList(nsIFrame* aFirstFrame, nsIFrame* aLastFrame) :
|
|
mFirstChild(aFirstFrame), mLastChild(aLastFrame)
|
|
{
|
|
VerifyList();
|
|
}
|
|
|
|
nsFrameList(const nsFrameList& aOther) :
|
|
mFirstChild(aOther.mFirstChild), mLastChild(aOther.mLastChild)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* Infallibly allocate a nsFrameList from the shell arena.
|
|
*/
|
|
void* operator new(size_t sz, nsIPresShell* aPresShell) CPP_THROW_NEW;
|
|
|
|
/**
|
|
* Deallocate this list that was allocated from the shell arena.
|
|
* The list is required to be empty.
|
|
*/
|
|
void Delete(nsIPresShell* aPresShell);
|
|
|
|
/**
|
|
* For each frame in this list: remove it from the list then call
|
|
* Destroy() on it.
|
|
*/
|
|
void DestroyFrames();
|
|
|
|
/**
|
|
* For each frame in this list: remove it from the list then call
|
|
* DestroyFrom(aDestructRoot) on it.
|
|
*/
|
|
void DestroyFramesFrom(nsIFrame* aDestructRoot);
|
|
|
|
void Clear() { mFirstChild = mLastChild = nullptr; }
|
|
|
|
void SetFrames(nsIFrame* aFrameList);
|
|
|
|
void SetFrames(nsFrameList& aFrameList) {
|
|
NS_PRECONDITION(!mFirstChild, "Losing frames");
|
|
|
|
mFirstChild = aFrameList.FirstChild();
|
|
mLastChild = aFrameList.LastChild();
|
|
aFrameList.Clear();
|
|
}
|
|
|
|
class Slice;
|
|
|
|
/**
|
|
* Append aFrameList to this list. If aParent is not null,
|
|
* reparents the newly added frames. Clears out aFrameList and
|
|
* returns a list slice represening the newly-appended frames.
|
|
*/
|
|
Slice AppendFrames(nsContainerFrame* aParent, nsFrameList& aFrameList) {
|
|
return InsertFrames(aParent, LastChild(), aFrameList);
|
|
}
|
|
|
|
|
|
/**
|
|
* Append aFrame to this list. If aParent is not null,
|
|
* reparents the newly added frame.
|
|
*/
|
|
void AppendFrame(nsContainerFrame* aParent, nsIFrame* aFrame) {
|
|
nsFrameList temp(aFrame, aFrame);
|
|
AppendFrames(aParent, temp);
|
|
}
|
|
|
|
/**
|
|
* Take aFrame out of the frame list. This also disconnects aFrame
|
|
* from the sibling list. The frame must be non-null and present on
|
|
* this list.
|
|
*/
|
|
void RemoveFrame(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Take the frames after aAfterFrame out of the frame list. If
|
|
* aAfterFrame is null, removes the entire list.
|
|
* @param aAfterFrame a frame in this list, or null
|
|
* @return the removed frames, if any
|
|
*/
|
|
nsFrameList RemoveFramesAfter(nsIFrame* aAfterFrame);
|
|
|
|
/**
|
|
* Take the first frame (if any) out of the frame list.
|
|
* @return the first child, or nullptr if the list is empty
|
|
*/
|
|
nsIFrame* RemoveFirstChild();
|
|
|
|
/**
|
|
* The following two functions are intended to be used in concert for
|
|
* removing a frame from its frame list when the set of possible frame
|
|
* lists is known in advance, but the exact frame list is unknown.
|
|
* aFrame must be non-null.
|
|
* Example use:
|
|
* bool removed = frameList1.StartRemoveFrame(aFrame) ||
|
|
* frameList2.ContinueRemoveFrame(aFrame) ||
|
|
* frameList3.ContinueRemoveFrame(aFrame);
|
|
* MOZ_ASSERT(removed);
|
|
*
|
|
* @note One of the frame lists MUST contain aFrame, if it's on some other
|
|
* frame list then the example above will likely lead to crashes.
|
|
* This function is O(1).
|
|
* @return true iff aFrame was removed from /some/ list, not necessarily
|
|
* this one. If it was removed from a different list then it is
|
|
* guaranteed that that list is still non-empty.
|
|
* (this method is implemented in nsIFrame.h to be able to inline)
|
|
*/
|
|
inline bool StartRemoveFrame(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Precondition: StartRemoveFrame MUST be called before this.
|
|
* This function is O(1).
|
|
* @see StartRemoveFrame
|
|
* @return true iff aFrame was removed from this list
|
|
* (this method is implemented in nsIFrame.h to be able to inline)
|
|
*/
|
|
inline bool ContinueRemoveFrame(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Take aFrame out of the frame list and then destroy it.
|
|
* The frame must be non-null and present on this list.
|
|
*/
|
|
void DestroyFrame(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Insert aFrame right after aPrevSibling, or prepend it to this
|
|
* list if aPrevSibling is null. If aParent is not null, also
|
|
* reparents newly-added frame. Note that this method always
|
|
* sets the frame's nextSibling pointer.
|
|
*/
|
|
void InsertFrame(nsContainerFrame* aParent, nsIFrame* aPrevSibling,
|
|
nsIFrame* aFrame) {
|
|
nsFrameList temp(aFrame, aFrame);
|
|
InsertFrames(aParent, aPrevSibling, temp);
|
|
}
|
|
|
|
|
|
/**
|
|
* Inserts aFrameList into this list after aPrevSibling (at the beginning if
|
|
* aPrevSibling is null). If aParent is not null, reparents the newly added
|
|
* frames. Clears out aFrameList and returns a list slice representing the
|
|
* newly-inserted frames.
|
|
*/
|
|
Slice InsertFrames(nsContainerFrame* aParent, nsIFrame* aPrevSibling,
|
|
nsFrameList& aFrameList);
|
|
|
|
class FrameLinkEnumerator;
|
|
|
|
/**
|
|
* Split this frame list such that all the frames before the link pointed to
|
|
* by aLink end up in the returned list, while the remaining frames stay in
|
|
* this list. After this call, aLink points to the beginning of this list.
|
|
*/
|
|
nsFrameList ExtractHead(FrameLinkEnumerator& aLink);
|
|
|
|
/**
|
|
* Split this frame list such that all the frames coming after the link
|
|
* pointed to by aLink end up in the returned list, while the frames before
|
|
* that link stay in this list. After this call, aLink is at end.
|
|
*/
|
|
nsFrameList ExtractTail(FrameLinkEnumerator& aLink);
|
|
|
|
nsIFrame* FirstChild() const {
|
|
return mFirstChild;
|
|
}
|
|
|
|
nsIFrame* LastChild() const {
|
|
return mLastChild;
|
|
}
|
|
|
|
nsIFrame* FrameAt(int32_t aIndex) const;
|
|
int32_t IndexOf(nsIFrame* aFrame) const;
|
|
|
|
bool IsEmpty() const {
|
|
return nullptr == mFirstChild;
|
|
}
|
|
|
|
bool NotEmpty() const {
|
|
return nullptr != mFirstChild;
|
|
}
|
|
|
|
bool ContainsFrame(const nsIFrame* aFrame) const;
|
|
|
|
int32_t GetLength() const;
|
|
|
|
/**
|
|
* If this frame list has only one frame, return that frame.
|
|
* Otherwise, return null.
|
|
*/
|
|
nsIFrame* OnlyChild() const {
|
|
if (FirstChild() == LastChild()) {
|
|
return FirstChild();
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
/**
|
|
* Call SetParent(aParent) for each frame in this list.
|
|
* @param aParent the new parent frame, must be non-null
|
|
*/
|
|
void ApplySetParent(nsContainerFrame* aParent) const;
|
|
|
|
/**
|
|
* If this frame list is non-empty then append it to aLists as the
|
|
* aListID child list.
|
|
* (this method is implemented in FrameChildList.h for dependency reasons)
|
|
*/
|
|
inline void AppendIfNonempty(nsTArray<mozilla::layout::FrameChildList>* aLists,
|
|
mozilla::layout::FrameChildListID aListID) const;
|
|
|
|
/**
|
|
* Return the frame before this frame in visual order (after Bidi reordering).
|
|
* If aFrame is null, return the last frame in visual order.
|
|
*/
|
|
nsIFrame* GetPrevVisualFor(nsIFrame* aFrame) const;
|
|
|
|
/**
|
|
* Return the frame after this frame in visual order (after Bidi reordering).
|
|
* If aFrame is null, return the first frame in visual order.
|
|
*/
|
|
nsIFrame* GetNextVisualFor(nsIFrame* aFrame) const;
|
|
|
|
#ifdef DEBUG_FRAME_DUMP
|
|
void List(FILE* out) const;
|
|
#endif
|
|
|
|
static inline const nsFrameList& EmptyList();
|
|
|
|
class Enumerator;
|
|
|
|
/**
|
|
* A class representing a slice of a frame list.
|
|
*/
|
|
class Slice {
|
|
friend class Enumerator;
|
|
|
|
public:
|
|
// Implicit on purpose, so that we can easily create enumerators from
|
|
// nsFrameList via this impicit constructor.
|
|
MOZ_IMPLICIT Slice(const nsFrameList& aList) :
|
|
#ifdef DEBUG
|
|
mList(aList),
|
|
#endif
|
|
mStart(aList.FirstChild()),
|
|
mEnd(nullptr)
|
|
{}
|
|
|
|
Slice(const nsFrameList& aList, nsIFrame* aStart, nsIFrame* aEnd) :
|
|
#ifdef DEBUG
|
|
mList(aList),
|
|
#endif
|
|
mStart(aStart),
|
|
mEnd(aEnd)
|
|
{}
|
|
|
|
Slice(const Slice& aOther) :
|
|
#ifdef DEBUG
|
|
mList(aOther.mList),
|
|
#endif
|
|
mStart(aOther.mStart),
|
|
mEnd(aOther.mEnd)
|
|
{}
|
|
|
|
private:
|
|
#ifdef DEBUG
|
|
const nsFrameList& mList;
|
|
#endif
|
|
nsIFrame* const mStart; // our starting frame
|
|
const nsIFrame* const mEnd; // The first frame that is NOT in the slice.
|
|
// May be null.
|
|
};
|
|
|
|
class Enumerator {
|
|
public:
|
|
explicit Enumerator(const Slice& aSlice) :
|
|
#ifdef DEBUG
|
|
mSlice(aSlice),
|
|
#endif
|
|
mFrame(aSlice.mStart),
|
|
mEnd(aSlice.mEnd)
|
|
{}
|
|
|
|
Enumerator(const Enumerator& aOther) :
|
|
#ifdef DEBUG
|
|
mSlice(aOther.mSlice),
|
|
#endif
|
|
mFrame(aOther.mFrame),
|
|
mEnd(aOther.mEnd)
|
|
{}
|
|
|
|
bool AtEnd() const {
|
|
// Can't just check mEnd, because some table code goes and destroys the
|
|
// tail of the frame list (including mEnd!) while iterating over the
|
|
// frame list.
|
|
return !mFrame || mFrame == mEnd;
|
|
}
|
|
|
|
/* Next() needs to know about nsIFrame, and nsIFrame will need to
|
|
know about nsFrameList methods, so in order to inline this put
|
|
the implementation in nsIFrame.h */
|
|
inline void Next();
|
|
|
|
/**
|
|
* Get the current frame we're pointing to. Do not call this on an
|
|
* iterator that is at end!
|
|
*/
|
|
nsIFrame* get() const {
|
|
NS_PRECONDITION(!AtEnd(), "Enumerator is at end");
|
|
return mFrame;
|
|
}
|
|
|
|
/**
|
|
* Get an enumerator that is just like this one, but not limited in terms of
|
|
* the part of the list it will traverse.
|
|
*/
|
|
Enumerator GetUnlimitedEnumerator() const {
|
|
return Enumerator(*this, nullptr);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
const nsFrameList& List() const { return mSlice.mList; }
|
|
#endif
|
|
|
|
protected:
|
|
Enumerator(const Enumerator& aOther, const nsIFrame* const aNewEnd):
|
|
#ifdef DEBUG
|
|
mSlice(aOther.mSlice),
|
|
#endif
|
|
mFrame(aOther.mFrame),
|
|
mEnd(aNewEnd)
|
|
{}
|
|
|
|
#ifdef DEBUG
|
|
/* Has to be an object, not a reference, since the slice could
|
|
well be a temporary constructed from an nsFrameList */
|
|
const Slice mSlice;
|
|
#endif
|
|
nsIFrame* mFrame; // our current frame.
|
|
const nsIFrame* const mEnd; // The first frame we should NOT enumerate.
|
|
// May be null.
|
|
};
|
|
|
|
/**
|
|
* A class that can be used to enumerate links between frames. When created
|
|
* from an nsFrameList, it points to the "link" immediately before the first
|
|
* frame. It can then be advanced until it points to the "link" immediately
|
|
* after the last frame. At any position, PrevFrame() and NextFrame() are
|
|
* the frames before and after the given link. This means PrevFrame() is
|
|
* null when the enumerator is at the beginning of the list and NextFrame()
|
|
* is null when it's AtEnd().
|
|
*/
|
|
class FrameLinkEnumerator : private Enumerator {
|
|
public:
|
|
friend class nsFrameList;
|
|
|
|
explicit FrameLinkEnumerator(const nsFrameList& aList) :
|
|
Enumerator(aList),
|
|
mPrev(nullptr)
|
|
{}
|
|
|
|
FrameLinkEnumerator(const FrameLinkEnumerator& aOther) :
|
|
Enumerator(aOther),
|
|
mPrev(aOther.mPrev)
|
|
{}
|
|
|
|
/* This constructor needs to know about nsIFrame, and nsIFrame will need to
|
|
know about nsFrameList methods, so in order to inline this put
|
|
the implementation in nsIFrame.h */
|
|
inline FrameLinkEnumerator(const nsFrameList& aList, nsIFrame* aPrevFrame);
|
|
|
|
void operator=(const FrameLinkEnumerator& aOther) {
|
|
NS_PRECONDITION(&List() == &aOther.List(), "Different lists?");
|
|
mFrame = aOther.mFrame;
|
|
mPrev = aOther.mPrev;
|
|
}
|
|
|
|
inline void Next();
|
|
|
|
bool AtEnd() const { return Enumerator::AtEnd(); }
|
|
|
|
nsIFrame* PrevFrame() const { return mPrev; }
|
|
nsIFrame* NextFrame() const { return mFrame; }
|
|
|
|
protected:
|
|
nsIFrame* mPrev;
|
|
};
|
|
|
|
class Iterator
|
|
{
|
|
public:
|
|
Iterator(const nsFrameList& aList, nsIFrame* aCurrent)
|
|
: mList(aList)
|
|
, mCurrent(aCurrent)
|
|
{}
|
|
|
|
Iterator(const Iterator& aOther)
|
|
: mList(aOther.mList)
|
|
, mCurrent(aOther.mCurrent)
|
|
{}
|
|
|
|
nsIFrame* operator*() const { return mCurrent; }
|
|
|
|
// The operators need to know about nsIFrame, hence the
|
|
// implementations are in nsIFrame.h
|
|
Iterator& operator++();
|
|
Iterator& operator--();
|
|
|
|
Iterator operator++(int) { auto ret = *this; ++*this; return ret; }
|
|
Iterator operator--(int) { auto ret = *this; --*this; return ret; }
|
|
|
|
friend bool operator==(const Iterator& aIter1, const Iterator& aIter2);
|
|
friend bool operator!=(const Iterator& aIter1, const Iterator& aIter2);
|
|
|
|
private:
|
|
const nsFrameList& mList;
|
|
nsIFrame* mCurrent;
|
|
};
|
|
|
|
typedef Iterator iterator;
|
|
typedef Iterator const_iterator;
|
|
typedef mozilla::ReverseIterator<Iterator> reverse_iterator;
|
|
typedef mozilla::ReverseIterator<Iterator> const_reverse_iterator;
|
|
|
|
iterator begin() const { return iterator(*this, mFirstChild); }
|
|
const_iterator cbegin() const { return begin(); }
|
|
iterator end() const { return iterator(*this, nullptr); }
|
|
const_iterator cend() const { return end(); }
|
|
reverse_iterator rbegin() const { return reverse_iterator(end()); }
|
|
const_reverse_iterator crbegin() const { return rbegin(); }
|
|
reverse_iterator rend() const { return reverse_iterator(begin()); }
|
|
const_reverse_iterator crend() const { return rend(); }
|
|
|
|
private:
|
|
void operator delete(void*) = delete;
|
|
|
|
#ifdef DEBUG_FRAME_LIST
|
|
void VerifyList() const;
|
|
#else
|
|
void VerifyList() const {}
|
|
#endif
|
|
|
|
protected:
|
|
/**
|
|
* Disconnect aFrame from its siblings. This must only be called if aFrame
|
|
* is NOT the first or last sibling, because otherwise its nsFrameList will
|
|
* have a stale mFirst/LastChild pointer. This precondition is asserted.
|
|
* This function is O(1).
|
|
*/
|
|
static void UnhookFrameFromSiblings(nsIFrame* aFrame);
|
|
|
|
nsIFrame* mFirstChild;
|
|
nsIFrame* mLastChild;
|
|
};
|
|
|
|
inline bool
|
|
operator==(const nsFrameList::Iterator& aIter1,
|
|
const nsFrameList::Iterator& aIter2)
|
|
{
|
|
MOZ_ASSERT(&aIter1.mList == &aIter2.mList,
|
|
"must not compare iterator from different list");
|
|
return aIter1.mCurrent == aIter2.mCurrent;
|
|
}
|
|
|
|
inline bool
|
|
operator!=(const nsFrameList::Iterator& aIter1,
|
|
const nsFrameList::Iterator& aIter2)
|
|
{
|
|
MOZ_ASSERT(&aIter1.mList == &aIter2.mList,
|
|
"Must not compare iterator from different list");
|
|
return aIter1.mCurrent != aIter2.mCurrent;
|
|
}
|
|
|
|
namespace mozilla {
|
|
namespace layout {
|
|
|
|
/**
|
|
* Simple "auto_ptr" for nsFrameLists allocated from the shell arena.
|
|
* The frame list given to the constructor will be deallocated (if non-null)
|
|
* in the destructor. The frame list must then be empty.
|
|
*/
|
|
class AutoFrameListPtr {
|
|
public:
|
|
AutoFrameListPtr(nsPresContext* aPresContext, nsFrameList* aFrameList)
|
|
: mPresContext(aPresContext), mFrameList(aFrameList) {}
|
|
~AutoFrameListPtr();
|
|
operator nsFrameList*() const { return mFrameList; }
|
|
nsFrameList* operator->() const { return mFrameList; }
|
|
private:
|
|
nsPresContext* mPresContext;
|
|
nsFrameList* mFrameList;
|
|
};
|
|
|
|
namespace detail {
|
|
union AlignedFrameListBytes {
|
|
void* ptr;
|
|
char bytes[sizeof(nsFrameList)];
|
|
};
|
|
extern const AlignedFrameListBytes gEmptyFrameListBytes;
|
|
} // namespace detail
|
|
|
|
} // namespace layout
|
|
} // namespace mozilla
|
|
|
|
/* static */ inline const nsFrameList&
|
|
nsFrameList::EmptyList()
|
|
{
|
|
return *reinterpret_cast<const nsFrameList*>(&mozilla::layout::detail::gEmptyFrameListBytes);
|
|
}
|
|
|
|
#endif /* nsFrameList_h___ */
|