This is used by `GtkCellArea` subclasses when handling events to activate cells, the base `GtkCellArea` class activates cells for
keyboard events for free in its own GtkCellArea->activate
implementation.
this |
a `GtkCellArea` |
widget |
the `GtkWidget` that this is rendering onto |
renderer |
the `GtkCellRenderer` in this to activate |
event |
the `GdkEvent` for which cell activation should occur |
cell_area |
the `GdkRectangle` in |
flags |
the `GtkCellRenderer`State for |
whether cell activation was successful |