Struct gtk4::DropDown [−][src]
pub struct DropDown(_);Expand description
DropDown is a widget that allows the user to choose an item
from a list of options.
The DropDown displays the selected choice.
The options are given to DropDown in the form of GListModel
and how the individual options are represented is determined by
a ListItemFactory. The default factory displays simple strings.
DropDown knows how to obtain strings from the items in a
StringList; for other models, you have to provide an expression
to find the strings via set_expression().
DropDown can optionally allow search in the popup, which is
useful if the list of options is long. To enable the search entry,
use set_enable_search().
CSS nodes
DropDown has a single CSS node with name dropdown,
with the button and popover nodes as children.
Accessibility
DropDown uses the AccessibleRole::ComboBox role.
Implements
WidgetExt, glib::ObjectExt, AccessibleExt, BuildableExt, ConstraintTargetExt, WidgetExtManual, AccessibleExtManual
Implementations
Creates a new builder-pattern struct instance to construct DropDown objects.
This method returns an instance of DropDownBuilder which can be used to create DropDown objects.
Gets the factory that’s currently used to populate list items.
The factory returned by this function is always used for the
item in the button. It is also used for items in the popup
if property::DropDown::list-factory is not set.
Returns
The factory in use
Gets the factory that’s currently used to populate list items in the popup.
Returns
The factory in use
Gets the position of the selected item.
Returns
the position of the selected item, or GTK_INVALID_LIST_POSITION
if not item is selected
Sets whether a search entry will be shown in the popup that allows to search for items in the list.
Note that property::DropDown::expression must be set for
search to work.
enable_search
whether to enable search
Selects the item at the given position.
position
the position of the item to select, or GTK_INVALID_LIST_POSITION
Creates a new DropDown.
You may want to call set_factory()
to set up a way to map its items to widgets.
model
the model to use
expression
the expression to use
Returns
a new DropDown
Sets the expression that gets evaluated to obtain strings from items.
This is used for search in the popup. The expression must have
a value type of G_TYPE_STRING.
expression
Trait Implementations
This method returns an ordering between self and other values if one exists. Read more
This method tests less than (for self and other) and is used by the < operator. Read more
This method tests less than or equal to (for self and other) and is used by the <=
operator. Read more
This method tests greater than (for self and other) and is used by the > operator. Read more
Returns the type identifier of Self.
Auto Trait Implementations
impl RefUnwindSafe for DropDown
impl UnwindSafe for DropDown
Blanket Implementations
Mutably borrows from an owned value. Read more
Upcasts an object to a superclass or interface T. Read more
Upcasts an object to a reference of its superclass or interface T. Read more
Tries to downcast to a subclass or interface implementor T. Read more
Tries to downcast to a reference of its subclass or interface implementor T. Read more
Tries to cast to an object of type T. This handles upcasting, downcasting
and casting between interface and interface implementors. All checks are performed at
runtime, while downcast and upcast will do many checks at compile-time already. Read more
Tries to cast to reference to an object of type T. This handles upcasting, downcasting
and casting between interface and interface implementors. All checks are performed at
runtime, while downcast and upcast will do many checks at compile-time already. Read more
Casts to T unconditionally. Read more
Casts to &T unconditionally. Read more
Returns true if the object is an instance of (can be cast to) T.
pub fn set_property<'a, N, V>(
&self,
property_name: N,
value: V
) -> Result<(), BoolError> where
N: Into<&'a str>,
V: ToValue,
pub fn set_property_from_value<'a, N>(
&self,
property_name: N,
value: &Value
) -> Result<(), BoolError> where
N: Into<&'a str>,
pub fn set_properties_from_value(
&self,
property_values: &[(&str, Value)]
) -> Result<(), BoolError>
pub fn has_property<'a, N>(&self, property_name: N, type_: Option<Type>) -> bool where
N: Into<&'a str>,
pub fn find_property<'a, N>(&self, property_name: N) -> Option<ParamSpec> where
N: Into<&'a str>,
Safety Read more
Safety Read more
Safety Read more
Safety Read more
pub fn connect<'a, N, F>(
&self,
signal_name: N,
after: bool,
callback: F
) -> Result<SignalHandlerId, BoolError> where
N: Into<&'a str>,
F: 'static + Fn(&[Value]) -> Option<Value> + Send + Sync,
Same as connect but takes a SignalId instead of a signal name.
pub fn connect_local<'a, N, F>(
&self,
signal_name: N,
after: bool,
callback: F
) -> Result<SignalHandlerId, BoolError> where
N: Into<&'a str>,
F: 'static + Fn(&[Value]) -> Option<Value>,
Same as connect_local but takes a SignalId instead of a signal name.
pub unsafe fn connect_unsafe<'a, N, F>(
&self,
signal_name: N,
after: bool,
callback: F
) -> Result<SignalHandlerId, BoolError> where
N: Into<&'a str>,
F: Fn(&[Value]) -> Option<Value>,
Same as connect_unsafe but takes a SignalId instead of a signal name.
Emit signal by signal id.
Same as emit but takes Value for the arguments.
Emit signal by its name.
Same as emit_by_name but takes Value for the arguments.
Emit signal with details by signal id.
Same as emit_with_details but takes Value for the arguments.
pub fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId where
F: 'static + Fn(&T, &ParamSpec) + Send + Sync,
pub fn connect_notify_local<F>(
&self,
name: Option<&str>,
f: F
) -> SignalHandlerId where
F: 'static + Fn(&T, &ParamSpec),
pub unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F
) -> SignalHandlerId where
F: Fn(&T, &ParamSpec),
pub fn bind_property<'a, O, N, M>(
&'a self,
source_property: N,
target: &'a O,
target_property: M
) -> BindingBuilder<'a> where
O: ObjectType,
N: Into<&'a str>,
M: Into<&'a str>,
Returns a SendValue clone of self.