a #GdkEvent
widget that received the event
widget-dependent string representation of the event location; e.g. for #GtkTreeView, a string representation of #GtkTreePath
background area as passed to gtk_cell_renderer_render()
cell area as passed to gtk_cell_renderer_render()
render flags
Return: %TRUE if the event was consumed/handled
Passes an activate event to the cell renderer for possible processing. Some cell renderers may use events; for example, #GtkCellRendererToggle toggles when it gets a mouse click.