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comparison: layout/generic/nsIAnonymousContentCreator.h
layout/generic/nsIAnonymousContentCreator.h
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 /* | |
| 7 * interface for rendering objects that manually create subtrees of | |
| 8 * anonymous content | |
| 9 */ | |
| 10 | |
| 11 #ifndef nsIAnonymousContentCreator_h___ | |
| 12 #define nsIAnonymousContentCreator_h___ | |
| 13 | |
| 14 #include "nsQueryFrame.h" | |
| 15 #include "nsIContent.h" | |
| 16 #include "nsStyleContext.h" | |
| 17 #include "nsTArrayForwardDeclare.h" | |
| 18 | |
| 19 class nsBaseContentList; | |
| 20 class nsIFrame; | |
| 21 | |
| 22 /** | |
| 23 * Any source for anonymous content can implement this interface to provide it. | |
| 24 * HTML frames like nsFileControlFrame currently use this. | |
| 25 * | |
| 26 * @see nsCSSFrameConstructor | |
| 27 */ | |
| 28 class nsIAnonymousContentCreator | |
| 29 { | |
| 30 public: | |
| 31 NS_DECL_QUERYFRAME_TARGET(nsIAnonymousContentCreator) | |
| 32 | |
| 33 struct ContentInfo { | |
| 34 ContentInfo(nsIContent* aContent) : | |
| 35 mContent(aContent) | |
| 36 {} | |
| 37 | |
| 38 ContentInfo(nsIContent* aContent, nsStyleContext* aStyleContext) : | |
| 39 mContent(aContent), mStyleContext(aStyleContext) | |
| 40 {} | |
| 41 | |
| 42 nsIContent* mContent; | |
| 43 nsRefPtr<nsStyleContext> mStyleContext; | |
| 44 nsTArray<ContentInfo> mChildren; | |
| 45 }; | |
| 46 | |
| 47 /** | |
| 48 * Creates "native" anonymous content and adds the created content to | |
| 49 * the aElements array. None of the returned elements can be nullptr. | |
| 50 * | |
| 51 * If the anonymous content creator sets the editable flag on some | |
| 52 * of the elements that it creates, the flag will be applied to the node | |
| 53 * upon being bound to the document. | |
| 54 * | |
| 55 * @note The returned elements are owned by this object. This object is | |
| 56 * responsible for calling UnbindFromTree on the elements it returned | |
| 57 * from CreateAnonymousContent when appropriate (i.e. before releasing | |
| 58 * them). | |
| 59 * | |
| 60 * @note Implementations of this method that add items to mChildren must not | |
| 61 * hook them up to any parent since frame construction takes care of | |
| 62 * that. | |
| 63 */ | |
| 64 virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements)=0; | |
| 65 | |
| 66 /** | |
| 67 * Appends "native" anonymous children created by CreateAnonymousContent() | |
| 68 * to the given content list depending on the filter. | |
| 69 * | |
| 70 * @see nsIContent::GetChildren for set of values used for filter. | |
| 71 */ | |
| 72 virtual void AppendAnonymousContentTo(nsBaseContentList& aElements, | |
| 73 uint32_t aFilter) = 0; | |
| 74 | |
| 75 /** | |
| 76 * Implementations can override this method to create special frames for the | |
| 77 * anonymous content returned from CreateAnonymousContent. | |
| 78 * By default this method returns nullptr, which means the default frame | |
| 79 * is created. | |
| 80 */ | |
| 81 virtual nsIFrame* CreateFrameFor(nsIContent* aContent) { return nullptr; } | |
| 82 }; | |
| 83 | |
| 84 #endif | |
| 85 |
