[LyX/master] Cleanup Row::findElement and introduce Row::pos2x

[Jean-Marc Lasgouttes]

commit 629a692ce28db51a8d49ca17f61e311947de8437
Author: Jean-Marc Lasgouttes <lasgouttes at lyx.org>
Date:   Fri Nov 29 12:13:15 2024 +0100

    Cleanup Row::findElement and introduce Row::pos2x
    
    Remove the functionality of findElement of also computing a pixel
    position and introduce a function that only does that.
---
 src/Cursor.cpp      |  3 +--
 src/Row.cpp         | 18 +++++++++++++++++-
 src/Row.h           | 11 +++++++++--
 src/TextMetrics.cpp |  7 +------
 4 files changed, 28 insertions(+), 11 deletions(-)

diff --git a/src/Cursor.cpp b/src/Cursor.cpp
index 11c04691f9..6c94716e66 100644
--- a/src/Cursor.cpp
+++ b/src/Cursor.cpp
@@ -1197,8 +1197,7 @@ void Cursor::getSurroundingPos(pos_type & left_pos, pos_type & right_pos) const
 	right_pos = -1;
 
 	Row const & row = textRow();
-	double dummy = 0;
-	Row::const_iterator cit = row.findElement(pos(), boundary(), dummy);
+	Row::const_iterator cit = row.findElement(pos(), boundary());
 	// Handle the case of empty row
 	if (cit == row.end()) {
 		if (row.isRTL())
diff --git a/src/Row.cpp b/src/Row.cpp
index d6c45c2ad6..7aa6d93447 100644
--- a/src/Row.cpp
+++ b/src/Row.cpp
@@ -753,8 +753,9 @@ void Row::reverseRTL()
 		reverse(elements_.begin(), elements_.end());
 }
 
+
 Row::const_iterator const
-Row::findElement(pos_type const pos, bool const boundary, double & x) const
+Row::findElementHelper(pos_type const pos, bool const boundary, double & x) const
 {
 	/**
 	 * When boundary is true, position i is in the row element (pos, endpos)
@@ -803,4 +804,19 @@ Row::findElement(pos_type const pos, bool const boundary, double & x) const
 }
 
 
+Row::const_iterator const Row::findElement(pos_type const pos, bool const boundary) const
+{
+	double dummy;
+	return findElementHelper(pos, boundary, dummy);
+}
+
+
+double Row::pos2x(pos_type const pos, bool const boundary) const
+{
+	double x;
+	findElementHelper(pos, boundary, x);
+	return x;
+}
+
+
 } // namespace lyx
diff --git a/src/Row.h b/src/Row.h
index cfb7427269..07cffa7fa7 100644
--- a/src/Row.h
+++ b/src/Row.h
@@ -257,6 +257,10 @@ public:
 	 *  adjusted to the actual pixel position.
 	 */
 	std::pair<pos_type, bool> x2pos(int & x) const;
+	/** Return the pixel position that corresponds to the position and
+	 * boundary.
+	 */
+	double pos2x(pos_type const pos, bool const boundary) const;
 
 	///
 	void add(pos_type pos, Inset const * ins, Dimension const & dim,
@@ -331,8 +335,8 @@ public:
 	///
 	void needsChangeBar(bool ncb) { changebar_ = ncb; }
 
-	/// Find row element that contains \c pos, and compute x offset.
-	const_iterator const findElement(pos_type pos, bool boundary, double & x) const;
+	/// Find row element that contains \c pos.
+	const_iterator const findElement(pos_type pos, bool boundary) const;
 
 	friend std::ostream & operator<<(std::ostream & os, Row const & row);
 
@@ -372,6 +376,9 @@ private:
 	 */
 	bool sameString(Font const & f, Change const & ch) const;
 
+	/// Find row element that contains \c pos, and compute x offset.
+	const_iterator const findElementHelper(pos_type pos, bool boundary, double & x) const;
+
 	///
 	Elements elements_;
 
diff --git a/src/TextMetrics.cpp b/src/TextMetrics.cpp
index 1f56a46c76..09712faf6c 100644
--- a/src/TextMetrics.cpp
+++ b/src/TextMetrics.cpp
@@ -1691,12 +1691,7 @@ int TextMetrics::cursorX(CursorSlice const & sl,
 	if (pm.rows().empty())
 		return 0;
 	Row const & row = pm.getRow(sl.pos(), boundary);
-	pos_type const pos = sl.pos();
-
-	double x = 0;
-	row.findElement(pos, boundary, x);
-	return int(x);
-
+	return row.pos2x(sl.pos(), boundary);
 }