These flags operate at the 'rendering' level, and, supercede the presence of theme elements, therefore,
theme_hidegrid(...)
or its aliases will PREVENT rendering of grid elements,
irrespective of whether those grid elements are valid (renderable). From the counter perspective,
theme_showgrid(...)
or its aliases will ALLOW rendering of grid elements, subject to those grid
elements being valid (renderable, ie say element_line
as opposed to element_blank
).
theme_hidegrid
or theme_nogrid
(alias) is a function which disables both MAJOR and MINOR gridlines.
theme_showgrid_major
is a function which enables MAJOR gridlines.
theme_hidegrid_major
or theme_nogrid_major
(alias) is a function which disables MAJOR gridlines.
theme_showgrid_major
is a function which enables MINOR gridlines.
theme_hidegrid_minor
or theme_nogrid_minor
(alias) is a function which disables MINOR gridlines.
theme_showgrid
is a function which enables both MAJOR and MINOR gridlines.