diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index b63b9e9f694..9177dfd4253 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,14 @@
+2019-07-17  Tom Tromey  <tom@tromey.com>
+
+	* tui/tui-windata.c (tui_display_data_from)
+	(tui_data_window::do_scroll_vertical): Update.
+	* tui/tui-regs.h (tui_line_from_reg_element_no): Don't declare.
+	* tui/tui-regs.c (tui_data_window::line_from_reg_element_no):
+	Rename from tui_line_from_reg_element_no.
+	(tui_display_registers_from_line): Update.
+	* tui/tui-data.h (struct tui_data_window)
+	<line_from_reg_element_no>: New method.
+
 2019-07-17  Tom Tromey  <tom@tromey.com>
 
 	* tui/tui-regs.h (tui_last_regs_line_no): Don't declare.
diff --git a/gdb/tui/tui-data.h b/gdb/tui/tui-data.h
index 9b1e892aefe..081d0dfa449 100644
--- a/gdb/tui/tui-data.h
+++ b/gdb/tui/tui-data.h
@@ -494,6 +494,11 @@ struct tui_data_window : public tui_win_info
      are no registers (-1) is returned.  */
   int last_regs_line_no () const;
 
+  /* Answer the line number that the register element at element_no is
+     on.  If element_no is greater than the number of register
+     elements there are, -1 is returned.  */
+  int line_from_reg_element_no (int element_no) const;
+
 protected:
 
   void do_scroll_vertical (int num_to_scroll) override;
diff --git a/gdb/tui/tui-regs.c b/gdb/tui/tui-regs.c
index e9fbf4b0752..03e91496b0f 100644
--- a/gdb/tui/tui-regs.c
+++ b/gdb/tui/tui-regs.c
@@ -79,21 +79,19 @@ tui_data_window::last_regs_line_no () const
   return num_lines;
 }
 
+/* See tui-data.h.  */
 
-/* Answer the line number that the register element at element_no is
-   on.  If element_no is greater than the number of register elements
-   there are, -1 is returned.  */
 int
-tui_line_from_reg_element_no (int element_no)
+tui_data_window::line_from_reg_element_no (int element_no) const
 {
-  if (element_no < TUI_DATA_WIN->regs_content.size ())
+  if (element_no < regs_content.size ())
     {
       int i, line = (-1);
 
       i = 1;
       while (line == (-1))
 	{
-	  if (element_no < TUI_DATA_WIN->regs_column_count * i)
+	  if (element_no < regs_column_count * i)
 	    line = i - 1;
 	  else
 	    i++;
@@ -391,7 +389,7 @@ tui_display_registers_from_line (int line_no,
 	     registers.  */
 	  if (line_no >= TUI_DATA_WIN->last_regs_line_no ())
 	    {
-	      if ((line = tui_line_from_reg_element_no (
+	      if ((line = TUI_DATA_WIN->line_from_reg_element_no (
 		 TUI_DATA_WIN->regs_content.size () - 1)) < 0)
 		line = 0;
 	    }
diff --git a/gdb/tui/tui-regs.h b/gdb/tui/tui-regs.h
index fcb440dcf11..f6ed8628f2a 100644
--- a/gdb/tui/tui-regs.h
+++ b/gdb/tui/tui-regs.h
@@ -29,7 +29,6 @@ extern void tui_show_registers (struct reggroup *group);
 extern void tui_display_registers_from (int);
 extern int tui_display_registers_from_line (int, int);
 extern int tui_first_reg_element_inline (int);
-extern int tui_line_from_reg_element_no (int);
 extern int tui_first_reg_element_no_inline (int lineno);
 
 #endif /* TUI_TUI_REGS_H */
diff --git a/gdb/tui/tui-windata.c b/gdb/tui/tui-windata.c
index 7ff50a0c905..ac3e6d6e097 100644
--- a/gdb/tui/tui-windata.c
+++ b/gdb/tui/tui-windata.c
@@ -134,7 +134,7 @@ tui_display_data_from (int element_no, int reuse_windows)
   int first_line = (-1);
 
   if (element_no < TUI_DATA_WIN->regs_content.size ())
-    first_line = tui_line_from_reg_element_no (element_no);
+    first_line = TUI_DATA_WIN->line_from_reg_element_no (element_no);
   else
     { /* Calculate the first_line from the element number.  */
     }
@@ -173,7 +173,7 @@ tui_data_window::do_scroll_vertical (int num_to_scroll)
 
   first_element_no = first_data_item_displayed ();
   if (first_element_no < regs_content.size ())
-    first_line = tui_line_from_reg_element_no (first_element_no);
+    first_line = line_from_reg_element_no (first_element_no);
   else
     { /* Calculate the first line from the element number which is in
         the general data content.  */