lua submenus add a way to dynamically add items

updated example script and renamed some functions as well

fixed bug in printtable cursor position if greater than maxlines for the
screen would reset to item 1

now we move the list start and select it
(and try to center it on the screen)

fixed a few bugs in the add_menu code

Change-Id: I01dead0481ef2e925af8b4cc6c14e36c2859dbba

1 files changed, 10 insertions, 0 deletions

diff --git a/apps/plugins/lua/include_lua/printtable.lua b/apps/plugins/lua/include_lua/printtable.lua
index bf81c7b060..7a883367b7 100644
--- a/apps/plugins/lua/include_lua/printtable.lua
+++ b/apps/plugins/lua/include_lua/printtable.lua
@@ -336,6 +336,16 @@ function print_table(t, t_count, settings)
 
     table_p = init_position(15, 5)
     line, maxline = _print.opt.area(5, 1, rb.LCD_WIDTH - 10 - sb_width, rb.LCD_HEIGHT - 2)
+
+    if curpos > maxline then
+        local c = maxline / 2
+        start = (start or 1) + curpos - maxline
+        curpos = maxline
+        while start + maxline <= t_count and curpos > c do
+            curpos = curpos - 1
+            start = start + 1
+        end
+    end
     maxline = math.min(maxline, t_count)
 
     -- allow user to start at a position other than the beginning