Starts editing the contents of this this, through a new `GtkCellEditable` widget created by the `GtkCellRenderer`Class.
start_editing virtual function.
this |
a `GtkCellRenderer` |
event |
a `GdkEvent` |
widget |
widget that received the event |
path |
widget-dependent string representation of the event location; e.g. for `GtkTreeView`, a string representation of `GtkTreePath` |
background_area |
background area as passed to |
cell_area |
cell area as passed to |
flags |
render flags |
A new `GtkCellEditable` for editing this this, or null if editing is not possible |