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

TreeExpander is a widget that provides an expander for a list.

It is typically placed as a bottommost child into a ListView to allow users to expand and collapse children in a list with a TreeListModel. TreeExpander provides the common UI elements, gestures and keybindings for this purpose.

On top of this, the “listitem.expand”, “listitem.collapse” and “listitem.toggle-expand” actions are provided to allow adding custom UI for managing expanded state.

The TreeListModel must be set to not be passthrough. Then it will provide TreeListRow items which can be set via set_list_row() on the expander. The expander will then watch that row item automatically. set_child() sets the widget that displays the actual row contents.

CSS nodes

treeexpander
├── [indent]*
├── [expander]
╰── <child>

TreeExpander has zero or one CSS nodes with the name “expander” that should display the expander icon. The node will be :checked when it is expanded. If the node is not expandable, an “indent” node will be displayed instead.

For every level of depth, another “indent” node is prepended.

Accessibility

TreeExpander uses the AccessibleRole::Group role. The expander icon is represented as a AccessibleRole::Button, labelled by the expander’s child, and toggling it will change the AccessibleState::Expanded state.

Implements

WidgetExt, glib::ObjectExt, AccessibleExt, BuildableExt, ConstraintTargetExt, WidgetExtManual, AccessibleExtManual

Implementations

Creates a new TreeExpander

Returns

a new TreeExpander

Creates a new builder-pattern struct instance to construct TreeExpander objects.

This method returns an instance of TreeExpanderBuilder which can be used to create TreeExpander objects.

Gets the child widget displayed by @self.

Returns

The child displayed by @self

This is supported on crate feature v4_6 only.

TreeExpander indents the child by the width of an expander-icon if it is not expandable.

Returns

TRUE if the child should be indented when not expandable. Otherwise FALSE.

Forwards the item set on the TreeListRow that @self is managing.

This call is essentially equivalent to calling:

⚠️ The following code is in c ⚠️

gtk_tree_list_row_get_item (gtk_tree_expander_get_list_row (@self));
Returns

The item of the row

Gets the list row managed by @self.

Returns

The list row displayed by @self

Sets the content widget to display.

child

a Widget

This is supported on crate feature v4_6 only.

Sets if the TreeExpander should indent the child by the width of an expander-icon when it is not expandable.

indent_for_icon

TRUE if the child should be indented without expander. Otherwise FALSE.

Sets the tree list row that this expander should manage.

list_row

a TreeListRow

This is supported on crate feature v4_6 only.

Trait Implementations

Returns a copy of the value. Read more

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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 !=.

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

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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

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Similar to Self::set_property but fails instead of panicking.

Sets the property property_name of the object to value value. Read more

Similar to Self::set_property but fails instead of panicking.

Sets the property property_name of the object to value value. Read more

Similar to Self::set_properties but fails instead of panicking.

Sets multiple properties of the object at once. Read more

Similar to Self::set_properties_from_value but fails instead of panicking.

Sets multiple properties of the object at once. Read more

Similar to Self::property but fails instead of panicking.

Gets the property property_name of the object and cast it to the type V. Read more

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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

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Return all ParamSpec of the properties of this object.

Freeze all property notifications until the return guard object is dropped. Read more

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Set arbitrary data on this object with the given key. Read more

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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.

Similar to Self::connect but fails instead of panicking.

Connect to the signal signal_name on this object. Read more

Similar to Self::connect_id but fails instead of panicking.

Connect to the signal signal_id on this object. Read more

Similar to Self::connect_local but fails instead of panicking.

Connect to the signal signal_name on this object. Read more

Similar to Self::connect_local_id but fails instead of panicking.

Connect to the signal signal_id on this object. Read more

Similar to Self::connect_unsafe but fails instead of panicking.

Connect to the signal signal_name on this object. Read more

Similar to Self::connect_unsafe_id but fails instead of panicking.

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Connect a closure to the signal signal_name on this object. Read more

Similar to Self::connect_closure_id but fails instead of panicking.

Connect a closure to the signal signal_id on this object. Read more

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Connect to the signal signal_id on this object. Read more

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Emit signal by its name. Read more

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Emit signal by signal id with details. Read more

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Emit signal by signal id with details. Read more

Disconnect a previously connected signal handler.

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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.

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🔬 This is a nightly-only experimental API. (toowned_clone_into)

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