Main renderering method. Implementations should implement this method to draw
onto the cairo context. The background_area indicates the total area of the
cell to be drawn. The cell_area indicates the area where content can be
drawn (text, images, etc).
The background_area is the cell_area plus the padding on each side (two
times the #GtkSourceGutterRenderer:xpad horizontally and two times the
#GtkSourceGutterRenderer:ypad vertically, so that the cell_area is centered
inside background_area).
The state argument indicates the current state of the renderer and should
be taken into account to properly draw the different possible states
(cursor, prelit, selected) if appropriate.
Main renderering method. Implementations should implement this method to draw onto the cairo context. The background_area indicates the total area of the cell to be drawn. The cell_area indicates the area where content can be drawn (text, images, etc).
The background_area is the cell_area plus the padding on each side (two times the #GtkSourceGutterRenderer:xpad horizontally and two times the #GtkSourceGutterRenderer:ypad vertically, so that the cell_area is centered inside background_area).
The state argument indicates the current state of the renderer and should be taken into account to properly draw the different possible states (cursor, prelit, selected) if appropriate.