pjs/layout/generic/nsIAnonymousContentCreator.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
* interface for rendering objects that manually create subtrees of
* anonymous content
*/
#ifndef nsIAnonymousContentCreator_h___
#define nsIAnonymousContentCreator_h___
#include "nsQueryFrame.h"
1999-08-20 02:16:23 +04:00
#include "nsIContent.h"
class nsIFrame;
template <class T, class A> class nsTArray;
/**
* Any source for anonymous content can implement this interface to provide it.
* HTML frames like nsFileControlFrame currently use this.
*
* @see nsCSSFrameConstructor
*/
class nsIAnonymousContentCreator
{
public:
NS_DECL_QUERYFRAME_TARGET(nsIAnonymousContentCreator)
/**
* Creates "native" anonymous content and adds the created content to
* the aElements array. None of the returned elements can be nsnull.
*
* @note The returned elements are owned by this object. This object is
* responsible for calling UnbindFromTree on the elements it returned
* from CreateAnonymousContent when appropriate (i.e. before releasing
* them).
*/
virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements)=0;
/**
* Appends "native" anonymous children created by CreateAnonymousContent()
* to the given content list depending on the filter.
*
* @see nsIContent::GetChildren for set of values used for filter.
*/
virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
PRUint32 aFilter) = 0;
/**
* Implementations can override this method to create special frames for the
* anonymous content returned from CreateAnonymousContent.
* By default this method returns nsnull, which means the default frame
* is created.
*/
virtual nsIFrame* CreateFrameFor(nsIContent* aContent) { return nsnull; }
};
#endif