Struct gtk4::SignalListItemFactory
source · #[repr(transparent)]pub struct SignalListItemFactory { /* private fields */ }
Expand description
SignalListItemFactory
is a ListItemFactory
that emits signals
to to manage listitems.
Signals are emitted for every listitem in the same order:
-
setup
is emitted to set up permanent things on the listitem. This usually means constructing the widgets used in the row and adding them to the listitem. -
bind
is emitted to bind the item passed viaitem
to the widgets that have been created in step 1 or to add item-specific widgets. Signals are connected to listen to changes - both to changes in the item to update the widgets or to changes in the widgets to update the item. After this signal has been called, the listitem may be shown in a list widget. -
unbind
is emitted to undo everything done in step 2. Usually this means disconnecting signal handlers. Once this signal has been called, the listitem will no longer be used in a list widget. -
bind
andunbind
may be emitted multiple times again to bind the listitem for use with new items. By reusing listitems, potentially costly setup can be avoided. However, it means code needs to make sure to properly clean up the listitem in step 3 so that no information from the previous use leaks into the next use. -
teardown
is emitted to allow undoing the effects ofsetup
. After this signal was emitted on a listitem, the listitem will be destroyed and not be used again.
Note that during the signal emissions, changing properties on the
ListItem
s passed will not trigger notify signals as the listitem’s
notifications are frozen. See g_object_freeze_notify() for details.
For tracking changes in other properties in the ListItem
, the
::notify signal is recommended. The signal can be connected in the
setup
signal and removed again during
teardown
.
Signals
bind
Emitted when an object has been bound, for example when a
new item
has been set on a
ListItem
and should be bound for use.
After this signal was emitted, the object might be shown in
a ListView
or other widget.
The unbind
signal is the
opposite of this signal and can be used to undo everything done
in this signal.
setup
Emitted when a new listitem has been created and needs to be setup for use.
It is the first signal emitted for every listitem.
The teardown
signal is the opposite
of this signal and can be used to undo everything done in this signal.
teardown
Emitted when an object is about to be destroyed.
It is the last signal ever emitted for this @object.
This signal is the opposite of the setup
signal and should be used to undo everything done in that signal.
unbind
Emitted when a object has been unbound from its item, for example when
a listitem was removed from use in a list widget
and its new item
is about to be unset.
This signal is the opposite of the bind
signal and should be used to undo everything done in that signal.
Implements
[ListItemFactoryExt
][trait@crate::prelude::ListItemFactoryExt], glib::ObjectExt
Implementations§
source§impl SignalListItemFactory
impl SignalListItemFactory
sourcepub fn new() -> SignalListItemFactory
pub fn new() -> SignalListItemFactory
Creates a new SignalListItemFactory
.
You need to connect signal handlers before you use it.
Returns
a new SignalListItemFactory
sourcepub fn connect_bind<F: Fn(&Self, &Object) + 'static>(
&self,
f: F
) -> SignalHandlerId
Available on crate feature v4_8
only.
pub fn connect_bind<F: Fn(&Self, &Object) + 'static>( &self, f: F ) -> SignalHandlerId
v4_8
only.Emitted when an object has been bound, for example when a
new item
has been set on a
ListItem
and should be bound for use.
After this signal was emitted, the object might be shown in
a ListView
or other widget.
The unbind
signal is the
opposite of this signal and can be used to undo everything done
in this signal.
object
The GObject
to bind
sourcepub fn connect_setup<F: Fn(&Self, &Object) + 'static>(
&self,
f: F
) -> SignalHandlerId
Available on crate feature v4_8
only.
pub fn connect_setup<F: Fn(&Self, &Object) + 'static>( &self, f: F ) -> SignalHandlerId
v4_8
only.sourcepub fn connect_teardown<F: Fn(&Self, &Object) + 'static>(
&self,
f: F
) -> SignalHandlerId
Available on crate feature v4_8
only.
pub fn connect_teardown<F: Fn(&Self, &Object) + 'static>( &self, f: F ) -> SignalHandlerId
v4_8
only.sourcepub fn connect_unbind<F: Fn(&Self, &Object) + 'static>(
&self,
f: F
) -> SignalHandlerId
Available on crate feature v4_8
only.
pub fn connect_unbind<F: Fn(&Self, &Object) + 'static>( &self, f: F ) -> SignalHandlerId
v4_8
only.Trait Implementations§
source§impl Clone for SignalListItemFactory
impl Clone for SignalListItemFactory
source§impl Debug for SignalListItemFactory
impl Debug for SignalListItemFactory
source§impl Default for SignalListItemFactory
impl Default for SignalListItemFactory
source§impl Display for SignalListItemFactory
impl Display for SignalListItemFactory
source§impl HasParamSpec for SignalListItemFactory
impl HasParamSpec for SignalListItemFactory
type ParamSpec = ParamSpecObject
§type SetValue = SignalListItemFactory
type SetValue = SignalListItemFactory
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, SignalListItemFactory>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for SignalListItemFactory
impl Hash for SignalListItemFactory
source§impl Ord for SignalListItemFactory
impl Ord for SignalListItemFactory
source§impl ParentClassIs for SignalListItemFactory
impl ParentClassIs for SignalListItemFactory
type Parent = ListItemFactory
source§impl<OT: ObjectType> PartialEq<OT> for SignalListItemFactory
impl<OT: ObjectType> PartialEq<OT> for SignalListItemFactory
source§impl<OT: ObjectType> PartialOrd<OT> for SignalListItemFactory
impl<OT: ObjectType> PartialOrd<OT> for SignalListItemFactory
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl StaticType for SignalListItemFactory
impl StaticType for SignalListItemFactory
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for SignalListItemFactory
impl IsA<ListItemFactory> for SignalListItemFactory
Auto Trait Implementations§
impl RefUnwindSafe for SignalListItemFactory
impl !Send for SignalListItemFactory
impl !Sync for SignalListItemFactory
impl Unpin for SignalListItemFactory
impl UnwindSafe for SignalListItemFactory
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f: F
) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec),
unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F ) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec),
notify
signal of the object. Read more