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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+/*
+ * interface for rendering objects that manually create subtrees of
+ * anonymous content
+ */
+
+#ifndef nsIAnonymousContentCreator_h___
+#define nsIAnonymousContentCreator_h___
+
+#include "mozilla/AnonymousContentKey.h"
+
+#include "nsQueryFrame.h"
+#include "nsTArrayForwardDeclare.h"
+#include "X11UndefineNone.h"
+
+class nsIContent;
+
+/**
+ * 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)
+
+ struct ContentInfo {
+ explicit ContentInfo(
+ nsIContent* aContent,
+ mozilla::AnonymousContentKey aKey = mozilla::AnonymousContentKey::None)
+ : mContent(aContent), mKey(aKey) {}
+
+ nsIContent* mContent;
+ mozilla::AnonymousContentKey mKey;
+ };
+
+ /**
+ * Creates "native" anonymous content and adds the created content to
+ * the aElements array. None of the returned elements can be nullptr.
+ *
+ * If the anonymous content creator sets the editable flag on some
+ * of the elements that it creates, the flag will be applied to the node
+ * upon being bound to the document.
+ *
+ * @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<ContentInfo>& 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. Currently,
+ * eSkipPlaceholderContent is the only flag that any implementation of
+ * this method heeds.
+ */
+ virtual void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
+ uint32_t aFilter) = 0;
+};
+
+#endif