gecko-dev/layout/base/nsFrameIterator.h

108 строки
3.1 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 NSFRAMEITERATOR_H
#define NSFRAMEITERATOR_H
#include "mozilla/StandardInteger.h"
class nsPresContext;
class nsIFrame;
enum nsIteratorType {
eLeaf,
ePreOrder,
ePostOrder
};
class nsFrameIterator
{
public:
nsFrameIterator(nsPresContext* aPresContext, nsIFrame *aStart,
nsIteratorType aType, uint32_t aFlags);
~nsFrameIterator() {}
void First();
void Next();
nsIFrame* CurrentItem();
bool IsDone();
void Last();
void Prev();
enum FrameIteratorFlags {
FLAG_NONE = 0,
FLAG_LOCK_SCROLL = 1 << 1,
FLAG_FOLLOW_OUT_OF_FLOW = 1 << 2,
FLAG_VISUAL = 1 << 3
};
protected:
void setCurrent(nsIFrame *aFrame){mCurrent = aFrame;}
nsIFrame *getCurrent(){return mCurrent;}
void setStart(nsIFrame *aFrame){mStart = aFrame;}
nsIFrame *getStart(){return mStart;}
nsIFrame *getLast(){return mLast;}
void setLast(nsIFrame *aFrame){mLast = aFrame;}
int8_t getOffEdge(){return mOffEdge;}
void setOffEdge(int8_t aOffEdge){mOffEdge = aOffEdge;}
void SetLockInScrollView(bool aLockScroll){mLockScroll = aLockScroll;}
/*
Our own versions of the standard frame tree navigation
methods, which, if the iterator is following out-of-flows,
apply the following rules for placeholder frames:
- If a frame HAS a placeholder frame, getting its parent
gets the placeholder's parent.
- If a frame's first child or next/prev sibling IS a
placeholder frame, then we instead return the real frame.
- If a frame HAS a placeholder frame, getting its next/prev
sibling gets the placeholder frame's next/prev sibling.
These are all applied recursively to support multiple levels of
placeholders.
*/
nsIFrame* GetParentFrame(nsIFrame* aFrame);
// like GetParentFrame but returns null once a popup frame is reached
nsIFrame* GetParentFrameNotPopup(nsIFrame* aFrame);
nsIFrame* GetFirstChild(nsIFrame* aFrame);
nsIFrame* GetLastChild(nsIFrame* aFrame);
nsIFrame* GetNextSibling(nsIFrame* aFrame);
nsIFrame* GetPrevSibling(nsIFrame* aFrame);
/*
These methods are different in visual mode to have the
semantics of "get first child in visual order", "get last child in visual
order", "get next sibling in visual order" and "get previous sibling in visual
order".
*/
nsIFrame* GetFirstChildInner(nsIFrame* aFrame);
nsIFrame* GetLastChildInner(nsIFrame* aFrame);
nsIFrame* GetNextSiblingInner(nsIFrame* aFrame);
nsIFrame* GetPrevSiblingInner(nsIFrame* aFrame);
nsIFrame* GetPlaceholderFrame(nsIFrame* aFrame);
bool IsPopupFrame(nsIFrame* aFrame);
nsPresContext* mPresContext;
nsIFrame *mStart;
nsIFrame *mCurrent;
nsIFrame *mLast; //the last one that was in current;
int8_t mOffEdge; //0= no -1 to far prev, 1 to far next;
nsIteratorType mType;
bool mLockScroll;
bool mFollowOOFs;
bool mVisual;
};
#endif //NSFRAMEITERATOR_H