Struct zng::var::VarHandle

pub struct VarHandle(/* private fields */);

Handle to a variable hook.

This can represent a widget subscriber, a var binding, var app handler or animation, dropping the handler stops the behavior it represents.

Implementations

impl VarHandle

pub fn dummy() -> VarHandle

Handle to no variable.

pub fn is_dummy(&self) -> bool

Returns true if the handle is a dummy.

pub fn perm(self)

Drop the handle without stopping the behavior it represents.

Note that the behavior can still be stopped by dropping the involved variables.

pub fn with(self, other: VarHandle) -> VarHandles

Create a VarHandles collection with self and other.

Trait Implementations

impl Clone for VarHandle

fn clone(&self) -> VarHandle

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for VarHandle

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

Formats the value using the given formatter.

impl Default for VarHandle

fn default() -> VarHandle

Returns the “default value” for a type.

impl Extend<VarHandle> for VarHandles

fn extend<T>(&mut self, iter: T)

where T: IntoIterator<Item = VarHandle>,

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

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

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

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

Reserves capacity in a collection for the given number of additional elements.

impl FromIterator<VarHandle> for VarHandles

fn from_iter<T>(iter: T) -> VarHandles

where T: IntoIterator<Item = VarHandle>,

Creates a value from an iterator.

impl Hash for VarHandle

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for VarHandle

fn eq(&self, other: &VarHandle) -> 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 VarHandle