gecko-dev/layout/base/nsIFrameTraversal.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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* Version 1.1 (the "License"); you may not use this file except in
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* The Original Code is mozilla.org code.
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* The Initial Developer of the Original Code is
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* the Initial Developer. All Rights Reserved.
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#ifndef NSIFRAMETRAVERSAL_H
#define NSIFRAMETRAVERSAL_H
#include "nsISupports.h"
#include "nsIEnumerator.h"
#include "nsIFrame.h"
/* Brief explanation of frame traversal types:
*
* LEAF:
* Iterate over only the leaf frames in the tree, in depth-first order.
*
* EXTENSIVE:
* Iterate over all frames in the tree, including non-leaf frames.
* Child frames are traversed before their parents going both forward
* and backward.
*
* FOCUS:
* Traverse frames in "focus" order, which is like extensive but
* does a strict preorder traversal in both directions. This type of
* traversal also handles placeholder frames transparently, meaning that
* it will never stop on one - going down will get the real frame, going
* back up will go on past the placeholder, so the placeholders are logically
* part of the frame tree.
*
* FASTEST:
* XXX not implemented
*
* VISUAL:
* Traverse frames in "visual" order (left-to-right, top-to-bottom).
*/
enum nsTraversalType{
LEAF,
EXTENSIVE,
FOCUS,
FASTEST
#ifdef IBMBIDI // Simon
, VISUAL
#endif
};
// {1691E1F3-EE41-11d4-9885-00C04FA0CF4B}
#define NS_IFRAMETRAVERSAL_IID \
{ 0x1691e1f3, 0xee41, 0x11d4, { 0x98, 0x85, 0x0, 0xc0, 0x4f, 0xa0, 0xcf, 0x4b } }
class nsIFrameTraversal : public nsISupports
{
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_IFRAMETRAVERSAL_IID)
NS_IMETHOD NewFrameTraversal(nsIBidirectionalEnumerator **aEnumerator,
PRUint32 aType,
nsIPresContext* aPresContext,
nsIFrame *aStart) = 0;
};
#endif //NSIFRAMETRAVERSAL_H