Struct gtk4::SelectionModel
source · #[repr(transparent)]pub struct SelectionModel { /* private fields */ }
Expand description
SelectionModel
is an interface that add support for selection to list models.
This support is then used by widgets using list models to add the ability to select and unselect various items.
GTK provides default implementations of the most common selection modes such
as SingleSelection
, so you will only need to implement this
interface if you want detailed control about how selections should be handled.
A SelectionModel
supports a single boolean per item indicating if an item is
selected or not. This can be queried via SelectionModelExt::is_selected()
.
When the selected state of one or more items changes, the model will emit the
selection-changed
signal by calling the
SelectionModelExt::selection_changed()
function. The positions given
in that signal may have their selection state changed, though that is not a
requirement. If new items added to the model via the
items-changed
signal are selected or not is up to the
implementation.
Note that items added via items-changed
may already
be selected and no selection-changed
will be
emitted for them. So to track which items are selected, it is necessary to
listen to both signals.
Additionally, the interface can expose functionality to select and unselect
items. If these functions are implemented, GTK’s list widgets will allow users
to select and unselect items. However, SelectionModel
s are free to only
implement them partially or not at all. In that case the widgets will not
support the unimplemented operations.
When selecting or unselecting is supported by a model, the return values of the selection functions do not indicate if selection or unselection happened. They are only meant to indicate complete failure, like when this mode of selecting is not supported by the model.
Selections may happen asynchronously, so the only reliable way to find out when an item was selected is to listen to the signals that indicate selection.
Signals
selection-changed
Emitted when the selection state of some of the items in @model changes.
Note that this signal does not specify the new selection state of the items, they need to be queried manually. It is also not necessary for a model to change the selection state of any of the items in the selection model, though it would be rather useless to emit such a signal.
ListModel
items-changed
This signal is emitted whenever items were added to or removed from @list. At @position, @removed items were removed and @added items were added in their place.
Note: If removed != added
, the positions of all later items
in the model change.
Implements
Implementations§
source§impl SelectionModel
impl SelectionModel
pub const NONE: Option<&'static SelectionModel> = None
Trait Implementations§
source§impl Clone for SelectionModel
impl Clone for SelectionModel
source§impl Debug for SelectionModel
impl Debug for SelectionModel
source§impl Display for SelectionModel
impl Display for SelectionModel
source§impl HasParamSpec for SelectionModel
impl HasParamSpec for SelectionModel
type ParamSpec = ParamSpecObject
§type SetValue = SelectionModel
type SetValue = SelectionModel
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, SelectionModel>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for SelectionModel
impl Hash for SelectionModel
source§impl<T: SelectionModelImpl> IsImplementable<T> for SelectionModel
impl<T: SelectionModelImpl> IsImplementable<T> for SelectionModel
source§fn interface_init(iface: &mut Interface<Self>)
fn interface_init(iface: &mut Interface<Self>)
source§fn instance_init(_instance: &mut InitializingObject<T>)
fn instance_init(_instance: &mut InitializingObject<T>)
source§impl Ord for SelectionModel
impl Ord for SelectionModel
source§impl<OT: ObjectType> PartialEq<OT> for SelectionModel
impl<OT: ObjectType> PartialEq<OT> for SelectionModel
source§impl<OT: ObjectType> PartialOrd<OT> for SelectionModel
impl<OT: ObjectType> PartialOrd<OT> for SelectionModel
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 SelectionModel
impl StaticType for SelectionModel
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for SelectionModel
impl IsA<ListModel> for SelectionModel
impl IsA<SelectionModel> for MultiSelection
impl IsA<SelectionModel> for NoSelection
impl IsA<SelectionModel> for SingleSelection
Auto Trait Implementations§
impl RefUnwindSafe for SelectionModel
impl !Send for SelectionModel
impl !Sync for SelectionModel
impl Unpin for SelectionModel
impl UnwindSafe for SelectionModel
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