pub struct ListItemFactory { /* private fields */ }
Expand description
A ListItemFactory
creates widgets for the items taken from a GListModel
.
This is one of the core concepts of handling list widgets such
as ListView
or GridView
.
The ListItemFactory
is tasked with creating widgets for items
taken from the model when the views need them and updating them as
the items displayed by the view change.
A view is usually only able to display anything after both a factory and a model have been set on the view. So it is important that you do not skip this step when setting up your first view.
Because views do not display the whole list at once but only a few
items, they only need to maintain a few widgets at a time. They will
instruct the ListItemFactory
to create these widgets and bind them
to the items that are currently displayed.
As the list model changes or the user scrolls to the list, the items will change and the view will instruct the factory to bind the widgets to those new items.
The actual widgets used for displaying those widgets is provided by you.
When the factory needs widgets created, it will create a ListItem
and hand it to your code to set up a widget for. This list item will provide
various properties with information about what item to display and provide
you with some opportunities to configure its behavior. See the
ListItem
documentation for further details.
Various implementations of ListItemFactory
exist to allow you different
ways to provide those widgets. The most common implementations are
BuilderListItemFactory
which takes a Builder
.ui file
and then creates widgets and manages everything automatically from the
information in that file and SignalListItemFactory
which allows
you to connect to signals with your own code and retain full control over
how the widgets are setup and managed.
A ListItemFactory
is supposed to be final - that means its behavior should
not change and the first widget created from it should behave the same way as
the last widget created from it.
If you intend to do changes to the behavior, it is recommended that you create
a new ListItemFactory
which will allow the views to recreate its widgets.
Once you have chosen your factory and created it, you need to set it
on the view widget you want to use it with, such as via
ListView::set_factory()
. Reusing factories across different
views is allowed, but very uncommon.
§Implements
[trait@glib::ObjectExt
]
GLib type: GObject with reference counted clone semantics.
Implementations§
Source§impl ListItemFactory
impl ListItemFactory
pub const NONE: Option<&'static ListItemFactory> = None
Trait Implementations§
Source§impl Clone for ListItemFactory
impl Clone for ListItemFactory
Source§impl Debug for ListItemFactory
impl Debug for ListItemFactory
Source§impl HasParamSpec for ListItemFactory
impl HasParamSpec for ListItemFactory
type ParamSpec = ParamSpecObject
Source§type SetValue = ListItemFactory
type SetValue = ListItemFactory
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, ListItemFactory>
fn param_spec_builder() -> Self::BuilderFn
Source§impl Hash for ListItemFactory
impl Hash for ListItemFactory
Source§impl Ord for ListItemFactory
impl Ord for ListItemFactory
Source§fn cmp(&self, other: &Self) -> Ordering
fn cmp(&self, other: &Self) -> Ordering
Comparison for two GObjects.
Compares the memory addresses of the provided objects.
1.21.0 · Source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
Source§impl ParentClassIs for ListItemFactory
impl ParentClassIs for ListItemFactory
Source§impl<OT: ObjectType> PartialEq<OT> for ListItemFactory
impl<OT: ObjectType> PartialEq<OT> for ListItemFactory
Source§impl<OT: ObjectType> PartialOrd<OT> for ListItemFactory
impl<OT: ObjectType> PartialOrd<OT> for ListItemFactory
Source§impl StaticType for ListItemFactory
impl StaticType for ListItemFactory
Source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for ListItemFactory
impl IsA<ListItemFactory> for BuilderListItemFactory
impl IsA<ListItemFactory> for SignalListItemFactory
Auto Trait Implementations§
impl Freeze for ListItemFactory
impl RefUnwindSafe for ListItemFactory
impl !Send for ListItemFactory
impl !Sync for ListItemFactory
impl Unpin for ListItemFactory
impl UnwindSafe for ListItemFactory
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