Struct gtk4::DropDown

source ·
#[repr(transparent)]
pub struct DropDown { /* private fields */ }
Expand description

DropDown is a widget that allows the user to choose an item from a list of options.

An example GtkDropDown

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().

Here is a UI definition example for DropDown with a simple model:

<object class="GtkDropDown">
  <property name="model">
    <object class="GtkStringList">
      <items>
        <item translatable="yes">Factory</item>
        <item translatable="yes">Home</item>
        <item translatable="yes">Subway</item>
      </items>
    </object>
  </property>
</object>

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 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

Creates a new DropDown that is populated with the strings.

strings

The strings to put in the dropdown

Returns

a new DropDown

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.

Returns whether search is enabled.

Returns

true if the popup includes a search entry

Gets the expression set that is used to obtain strings from items.

See set_expression().

Returns

a Expression

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 model that provides the displayed items.

Returns

The model 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

Gets the selected item. If no item is selected, None is returned.

Returns

The selected item

Available on crate feature v4_6 only.

Returns whether to show an arrow within the widget.

Returns

true if an arrow will be shown.

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.

whether to enable search

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

a Expression

Sets the ListItemFactory to use for populating list items.

factory

the factory to use

Sets the ListItemFactory to use for populating list items in the popup.

factory

the factory to use

Sets the GListModel to use.

model

the model to use

Selects the item at the given position.

position

the position of the item to select, or GTK_INVALID_LIST_POSITION

Available on crate feature v4_6 only.

Sets whether an arrow will be displayed within the widget.

show_arrow

whether to show an arrow within the widget

Available on crate feature v4_6 only.

Emitted to when the drop down is activated.

The ::activate signal on DropDown is an action signal and emitting it causes the drop down to pop up its dropdown.

Available on crate feature v4_6 only.
Available on crate feature v4_6 only.

Trait Implementations§

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Returns the “default value” for a type. Read more
Formats the value using the given formatter. Read more
Feeds this value into the given Hasher. Read more
Feeds a slice of this type into the given Hasher. Read more
This method returns an Ordering between self and other. Read more
Compares and returns the maximum of two values. Read more
Compares and returns the minimum of two values. Read more
Restrict a value to a certain interval. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
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
This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
Returns the type identifier of Self.

Auto Trait Implementations§

Blanket Implementations§

Updates an array of accessible properties. Read more
Updates an array of accessible relations. Read more
Updates an array of accessible states. Read more
Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
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 the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Returns true if the object is an instance of (can be cast to) T.
Returns the type of the object.
Returns the ObjectClass of the object. Read more
Returns the class of the object.
Returns the class of the object in the given type T. Read more
Returns the interface T of the object. Read more
Sets the property property_name of the object to value value. Read more
Sets the property property_name of the object to value value. Read more
Sets multiple properties of the object at once. Read more
Sets multiple properties of the object at once. Read more
Gets the property property_name of the object and cast it to the type V. Read more
Gets the property property_name of the object. Read more
Check if the object has a property property_name of the given type_. Read more
Get the type of the property property_name of this object. Read more
Get the ParamSpec of the property property_name of this object.
Return all ParamSpec of the properties of this object.
Freeze all property notifications until the return guard object is dropped. Read more
Set arbitrary data on this object with the given key. Read more
Return previously set arbitrary data of this object with the given key. Read more
Retrieve previously set arbitrary data of this object with the given key. Read more
Set arbitrary data on this object with the given key. Read more
Return previously set arbitrary data of this object with the given key. Read more
Retrieve previously set arbitrary data of this object with the given key. Read more
Block a given signal handler. Read more
Unblock a given signal handler.
Stop emission of the currently emitted signal.
Stop emission of the currently emitted signal by the (possibly detailed) signal name.
Connect to the signal signal_name on this object. Read more
Connect to the signal signal_id on this object. Read more
Connect to the signal signal_name on this object. Read more
Connect to the signal signal_id on this object. Read more
Connect to the signal signal_name on this object. Read more
Connect to the signal signal_id on this object. Read more
Connect a closure to the signal signal_name on this object. Read more
Connect a closure to the signal signal_id on this object. Read more
Limits the lifetime of closure to the lifetime of the object. When the object’s reference count drops to zero, the closure will be invalidated. An invalidated closure will ignore any calls to invoke_with_values, or invoke when using Rust closures. Read more
Emit signal by signal id. Read more
Same as Self::emit but takes Value for the arguments.
Emit signal by its name. Read more
Emit signal by its name. Read more
Emit signal by its name with details. Read more
Emit signal by its name with details. Read more
Emit signal by signal id with details. Read more
Emit signal by signal id with details. Read more
Disconnect a previously connected signal handler.
Connect to the notify signal of the object. Read more
Connect to the notify signal of the object. Read more
Connect to the notify signal of the object. Read more
Notify that the given property has changed its value. Read more
Notify that the given property has changed its value. Read more
Downgrade this object to a weak reference.
Add a callback to be notified when the Object is disposed.
Add a callback to be notified when the Object is disposed. Read more
Bind property source_property on this object to the target_property on the target object. Read more
Returns the strong reference count of this object.
Runs the dispose mechanism of the object. Read more
Ensures that the type has been registered with the type system.
The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
Converts the given value to a String. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.