From b520657039c5e37a9173837560f3a328b2d51cff Mon Sep 17 00:00:00 2001
From: Richard Heck <rgheck@comcast.net>
Date: Thu, 29 Jul 2010 15:44:17 +0000
Subject: [PATCH] HTML for xarrows.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@35026 a592a061-630c-0410-9148-cb99ea01b6c8
---
 src/mathed/InsetMathXArrow.cpp | 18 ++++++++++++++++++
 src/mathed/InsetMathXArrow.h   |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/src/mathed/InsetMathXArrow.cpp b/src/mathed/InsetMathXArrow.cpp
index 54d7356381..31c9c0c5d8 100644
--- a/src/mathed/InsetMathXArrow.cpp
+++ b/src/mathed/InsetMathXArrow.cpp
@@ -86,9 +86,27 @@ void InsetMathXArrow::mathmlize(MathStream & ms) const
 }
 
 
+void InsetMathXArrow::htmlize(HtmlStream & os) const
+{
+	char const * const arrow = name_ == "xleftarrow" 
+			? "&larr;" : "&rarr;";
+	os << MTag("span", "class='xarrow'")
+		 << MTag("span", "class='xatop'") << cell(0) << ETag("span")
+		 << MTag("span", "class='xabottom'") << arrow << ETag("span")
+		 << ETag("span");
+}
+
+
 void InsetMathXArrow::validate(LaTeXFeatures & features) const
 {
 	features.require("amsmath");
+	if (features.runparams().math_flavor == OutputParams::MathAsHTML)
+		// CSS adapted from eLyXer
+		features.addPreambleSnippet("<style type=\"text/css\">\n"
+			"span.xarrow{display: inline-block; vertical-align: middle; text-align:center;}\n"
+			"span.xatop{display: block;}\n"
+			"span.xabottom{display: block;}\n"
+			"</style>");
 	InsetMathNest::validate(features);
 }
 
diff --git a/src/mathed/InsetMathXArrow.h b/src/mathed/InsetMathXArrow.h
index ac6eaae0f9..f63eb2be19 100644
--- a/src/mathed/InsetMathXArrow.h
+++ b/src/mathed/InsetMathXArrow.h
@@ -34,6 +34,8 @@ public:
 	///
 	void mathmlize(MathStream &) const;
 	///
+	void htmlize(HtmlStream &) const;
+	///
 	void validate(LaTeXFeatures & features) const;
 	///
 	InsetCode lyxCode() const { return MATH_XARROW_CODE; }
-- 
2.39.2