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85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* interface for rendering objects that manually create subtrees of
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* anonymous content
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*/
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#ifndef nsIAnonymousContentCreator_h___
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#define nsIAnonymousContentCreator_h___
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#include "nsQueryFrame.h"
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#include "nsStyleContext.h"
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#include "nsTArrayForwardDeclare.h"
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class nsIContent;
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class nsIFrame;
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/**
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* Any source for anonymous content can implement this interface to provide it.
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* HTML frames like nsFileControlFrame currently use this.
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*
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* @see nsCSSFrameConstructor
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*/
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class nsIAnonymousContentCreator
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{
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public:
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NS_DECL_QUERYFRAME_TARGET(nsIAnonymousContentCreator)
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struct ContentInfo {
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explicit ContentInfo(nsIContent* aContent) :
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mContent(aContent)
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{}
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ContentInfo(nsIContent* aContent, nsStyleContext* aStyleContext) :
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mContent(aContent), mStyleContext(aStyleContext)
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{}
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nsIContent* mContent;
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nsRefPtr<nsStyleContext> mStyleContext;
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nsTArray<ContentInfo> mChildren;
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};
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/**
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* Creates "native" anonymous content and adds the created content to
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* the aElements array. None of the returned elements can be nullptr.
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*
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* If the anonymous content creator sets the editable flag on some
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* of the elements that it creates, the flag will be applied to the node
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* upon being bound to the document.
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*
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* @note The returned elements are owned by this object. This object is
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* responsible for calling UnbindFromTree on the elements it returned
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* from CreateAnonymousContent when appropriate (i.e. before releasing
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* them).
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*
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* @note Implementations of this method that add items to mChildren must not
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* hook them up to any parent since frame construction takes care of
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* that.
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*/
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virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements)=0;
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/**
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* Appends "native" anonymous children created by CreateAnonymousContent()
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* to the given content list depending on the filter.
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*
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* @see nsIContent::GetChildren for set of values used for filter.
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*/
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virtual void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
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uint32_t aFilter) = 0;
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/**
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* Implementations can override this method to create special frames for the
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* anonymous content returned from CreateAnonymousContent.
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* By default this method returns nullptr, which means the default frame
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* is created.
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*/
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virtual nsIFrame* CreateFrameFor(nsIContent* aContent) { return nullptr; }
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};
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#endif
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