Struct Conditional 

pub struct Conditional<C: RepeatedItemTree> { /* private fields */ }

Implementations

impl<C: RepeatedItemTree + 'static> Conditional<C>

pub fn track_model_changes(self: Pin<&Self>)

Register the condition as a dependency of the current tracking scope (e.g. the redraw tracker) so it is notified when the condition changes.

pub fn track_instance_changes(self: Pin<&Self>)

Register the instance generation as a dependency of the current tracking scope. Layout code uses this to re-evaluate only after ensure_updated materializes instance changes.

pub fn ensure_updated( self: Pin<&Self>, init: impl Fn() -> VRc<ItemTreeVTable, C>, ) -> bool

Call this function to make sure that the model is updated. The init function is the function to create a ItemTree. Returns true if the instance was created or removed, or any child changed.

pub fn set_model_binding(&self, binding: impl Fn() -> bool + 'static)

Set the model binding

pub fn visit( self: Pin<&Self>, order: TraversalOrder, visitor: ItemVisitorRefMut<'_>, ) -> VisitChildrenResult

Call the visitor for the root of each instance. Also registers model dependencies so the current tracking scope (e.g. the redraw tracker) is notified when the condition changes.

pub fn len(&self) -> usize

Return the amount of instances (1 if the conditional is active, 0 otherwise)

pub fn range(&self) -> Range<usize>

Return the range of indices used by this Conditional.

Similar to Repeater::range, but the range is always [0, 1] if the Conditional is active.

pub fn instance_at(&self, index: usize) -> Option<VRc<ItemTreeVTable, C>>

Return the instance for the given model index. The index should be within Self::range()

pub fn is_empty(&self) -> bool

Return true if the Repeater as empty

pub fn instances_vec(&self) -> Vec<VRc<ItemTreeVTable, C>>

Returns a vector containing all instances

Trait Implementations

impl<C: RepeatedItemTree> Default for Conditional<C>

fn default() -> Self

Returns the “default value” for a type.

impl<'pin, C: RepeatedItemTree> Unpin for Conditional<C>

where PinnedFieldsOf<__Conditional<'pin, C>>: Unpin,