Enum TreeMessage

pub enum TreeMessage {
    Expand {
        expand: bool,
        expansion_strategy: TreeExpansionStrategy,
    },
    AddItem(Handle<UiNode>),
    RemoveItem(Handle<UiNode>),
    SetExpanderShown(bool),
    SetItems {
        items: Vec<Handle<UiNode>>,
        remove_previous: bool,
    },
    // some variants omitted
}

A set of messages, that could be used to alternate the state of a Tree widget.

Variants

Expand

A message, that is used to expand a tree. Exact expansion behavior depends on the expansion strategy (see TreeExpansionStrategy docs for more info).

Fields

expand: bool

Expand (true) or collapse (false) a tree.

expansion_strategy: TreeExpansionStrategy

Expansion strategy.

AddItem(Handle<UiNode>)

A message, that is used to add an item to a tree.

RemoveItem(Handle<UiNode>)

A message, that is used to remove an item from a tree.

SetExpanderShown(bool)

A message, that is used to prevent expander from being hidden when a tree does not have any child items.

SetItems

A message, that is used to specify a new set of children items of a tree.

Fields

items: Vec<Handle<UiNode>>

A set of handles to new tree items.

remove_previous: bool

A flag, that defines whether the previous items should be deleted or not. false is usually used to reorder existing items.

Implementations

impl TreeMessage

pub fn expand( destination: Handle<UiNode>, direction: MessageDirection, expand: bool, expansion_strategy: TreeExpansionStrategy, ) -> UiMessage

Creates TreeMessage::Expand message.

pub fn add_item( destination: Handle<UiNode>, direction: MessageDirection, value: Handle<UiNode>, ) -> UiMessage

Creates TreeMessage::AddItem message.

pub fn remove_item( destination: Handle<UiNode>, direction: MessageDirection, value: Handle<UiNode>, ) -> UiMessage

Creates TreeMessage::RemoveItem message.

pub fn set_expander_shown( destination: Handle<UiNode>, direction: MessageDirection, value: bool, ) -> UiMessage

Creates TreeMessage::SetExpanderShown message.

pub fn set_items( destination: Handle<UiNode>, direction: MessageDirection, items: Vec<Handle<UiNode>>, remove_previous: bool, ) -> UiMessage

Creates TreeMessage::SetItems message.

pub fn select( destination: Handle<UiNode>, direction: MessageDirection, value: SelectionState, ) -> UiMessage

Creates TreeMessage::Select message.

Trait Implementations

impl Clone for TreeMessage

fn clone(&self) -> TreeMessage

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TreeMessage

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl PartialEq for TreeMessage

fn eq(&self, other: &TreeMessage) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for TreeMessage

impl StructuralPartialEq for TreeMessage