1 files changed, 69 insertions, 0 deletions
diff --git a/layout/mathml/nsMathMLmsqrtFrame.h b/layout/mathml/nsMathMLmsqrtFrame.h
new file mode 100644
index 0000000000..43c2702c6c
--- /dev/null
+++ b/layout/mathml/nsMathMLmsqrtFrame.h
@@ -0,0 +1,69 @@
+/* -*- 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/. */
+
+#ifndef nsMathMLmsqrtFrame_h___
+#define nsMathMLmsqrtFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsMathMLmencloseFrame.h"
+
+namespace mozilla {
+class PresShell;
+}  // namespace mozilla
+
+//
+// <msqrt> -- form a radical
+//
+
+/*
+The MathML REC describes:
+
+The <msqrt> element is used to display square roots.
+The syntax for <msqrt> is:
+  <msqrt> base </msqrt>
+
+Attributes of <msqrt> and <mroot>:
+
+None (except the attributes allowed for all MathML elements, listed in Section
+2.3.4).
+
+The <mroot> element increments scriptlevel by 2, and sets displaystyle to
+"false", within index, but leaves both attributes unchanged within base. The
+<msqrt> element leaves both attributes unchanged within all its arguments.
+These attributes are inherited by every element from its rendering environment,
+but can be set explicitly only on <mstyle>. (See Section 3.3.4.)
+*/
+
+// XXXfredw: This class should share its layout logic with nsMathMLmrootFrame
+// when the menclose "radical" notation is removed.
+// See https://bugzilla.mozilla.org/show_bug.cgi?id=1548522
+class nsMathMLmsqrtFrame final : public nsMathMLmencloseFrame {
+ public:
+  NS_DECL_FRAMEARENA_HELPERS(nsMathMLmsqrtFrame)
+
+  friend nsIFrame* NS_NewMathMLmsqrtFrame(mozilla::PresShell* aPresShell,
+                                          ComputedStyle* aStyle);
+
+  virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
+                    nsIFrame* aPrevInFlow) override;
+
+  NS_IMETHOD
+  InheritAutomaticData(nsIFrame* aParent) override;
+
+  virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                                    int32_t aModType) override;
+
+  virtual bool IsMrowLike() override {
+    return mFrames.FirstChild() != mFrames.LastChild() || !mFrames.FirstChild();
+  }
+
+ protected:
+  explicit nsMathMLmsqrtFrame(ComputedStyle* aStyle,
+                              nsPresContext* aPresContext);
+  virtual ~nsMathMLmsqrtFrame();
+};
+
+#endif /* nsMathMLmsqrtFrame_h___ */