Gtk.Sorter¶

Subclasses:: Gtk.ColumnViewSorter, Gtk.CustomSorter, Gtk.MultiSorter, Gtk.NumericSorter, Gtk.StringSorter, Gtk.TreeListRowSorter

Methods¶

Inherited:: GObject.Object (37)
Structs:: GObject.ObjectClass (5)

	`changed` (change)
	`compare` (item1, item2)
	`get_order` ()

Virtual Methods¶

Inherited:: GObject.Object (7)

	`do_compare` (item1, item2)
	`do_get_order` ()

Properties¶

None

Signals¶

Inherited:: GObject.Object (1)

Name	Short Description
`changed`	Emitted whenever the sorter changed.

Fields¶

Inherited:: GObject.Object (1)

Name	Type	Access	Description
parent_instance	`GObject.Object`	r

Class Details¶

class Gtk.Sorter(**kwargs)¶

Bases:: GObject.Object
Abstract:: No
Structure:: Gtk.SorterClass

Describes sorting criteria for a [class`Gtk`.SortListModel].

Its primary user is [class`Gtk`.SortListModel]

The model will use a sorter to determine the order in which its items should appear by calling [method`Gtk`.Sorter.compare] for pairs of items.

Sorters may change their sorting behavior through their lifetime. In that case, they will emit the [signal`Gtk`.Sorter::changed] signal to notify that the sort order is no longer valid and should be updated by calling Gtk.Sorter.compare() again.

GTK provides various pre-made sorter implementations for common sorting operations. [class`Gtk`.ColumnView] has built-in support for sorting lists via the [property`Gtk`.ColumnViewColumn:sorter] property, where the user can change the sorting by clicking on list headers.

Of course, in particular for large lists, it is also possible to subclass GtkSorter and provide one’s own sorter.

changed(change)[source]¶

Parameters:: change (Gtk.SorterChange) – How the sorter changed

Notifies all users of the sorter that it has changed.

This emits the [signal`Gtk`.Sorter::changed] signal. Users of the sorter should then update the sort order via [method`Gtk`.Sorter.compare].

Depending on the change parameter, it may be possible to update the sort order without a full resorting. Refer to the [enum`Gtk`.SorterChange] documentation for details.

This function is intended for implementers of GtkSorter subclasses and should not be called from other functions.

compare(item1, item2)[source]¶

Parameters:

item1 (GObject.Object) – first item to compare
item2 (GObject.Object) – second item to compare

Returns:

Gtk.Ordering.EQUAL if item1 == item2, Gtk.Ordering.SMALLER if item1 < item2, Gtk.Ordering.LARGER if item1 > item2

Return type:

Gtk.Ordering

Compares two given items according to the sort order implemented by the sorter.

Sorters implement a partial order:

It is reflexive, ie a = a
It is antisymmetric, ie if a < b and b < a, then a = b
It is transitive, ie given any 3 items with a ≤ b and b ≤ c, then a ≤ c

The sorter may signal it conforms to additional constraints via the return value of [method`Gtk`.Sorter.get_order].

get_order()[source]¶

Returns:: The order
Return type:: Gtk.SorterOrder

Gets the order that self conforms to.

See [enum`Gtk`.SorterOrder] for details of the possible return values.

This function is intended to allow optimizations.

do_compare(item1, item2) virtual¶

Parameters:

item1 (GObject.Object or None) – first item to compare
item2 (GObject.Object or None) – second item to compare

Returns:

Gtk.Ordering.EQUAL if item1 == item2, Gtk.Ordering.SMALLER if item1 < item2, Gtk.Ordering.LARGER if item1 > item2

Return type:

Gtk.Ordering

Compares two given items according to the sort order implemented by the sorter.

Sorters implement a partial order:

It is reflexive, ie a = a
It is antisymmetric, ie if a < b and b < a, then a = b
It is transitive, ie given any 3 items with a ≤ b and b ≤ c, then a ≤ c

The sorter may signal it conforms to additional constraints via the return value of [method`Gtk`.Sorter.get_order].

do_get_order() virtual¶

Returns:: The order
Return type:: Gtk.SorterOrder

Gets the order that self conforms to.

See [enum`Gtk`.SorterOrder] for details of the possible return values.

This function is intended to allow optimizations.

Signal Details¶

Gtk.Sorter.signals.changed(sorter, change)¶

Signal Name:

changed

Flags:

RUN_LAST

Parameters:

sorter (Gtk.Sorter) – The object which received the signal
change (Gtk.SorterChange) – how the sorter changed

Emitted whenever the sorter changed.

Users of the sorter should then update the sort order again via Gtk.Sorter.compare().

[class`Gtk`.SortListModel] handles this signal automatically.

Depending on the change parameter, it may be possible to update the sort order without a full resorting. Refer to the [enum`Gtk`.SorterChange] documentation for details.