1 files changed, 69 insertions, 0 deletions
diff --git a/layout/generic/nsIAnonymousContentCreator.h b/layout/generic/nsIAnonymousContentCreator.h
new file mode 100644
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+++ b/layout/generic/nsIAnonymousContentCreator.h
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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"
+
+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