self as changed, causing any state that depends on this
to be updated. This affects sorting and filtering.
Note that calls to this method must be in sync with the data
used for the sorting and filtering functions. For instance, if
the list is mirroring some external data set, and two children
changed in the external data set when you call
FlowBoxChildExt::changed on the first child, the sort function
must only read the new data for the first of the two changed
children, otherwise the resorting of the children will be wrong.
This generally means that if you don’t fully control the data
model, you have to duplicate the data that affects the sorting
and filtering functions into the widgets themselves. Another
alternative is to call
FlowBoxExt::invalidate_sort on any
model change, but that is more expensive.
Gets the current index of the
self in its
the index of the
self, or -1 if the
self is not
in a flow box.
fn is_selected(&self) -> bool
Returns whether the
self is currently selected in its
self is selected
fn connect_activate<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
The ::activate signal is emitted when the user activates
a child widget in a
FlowBox, either by clicking or
double-clicking, or by using the Space or Enter key.
While this signal is used as a
it can be used by applications for their own purposes.