Struct panoramix::elements::EmptyElement

pub struct EmptyElement<CpEvent = NoEvent, CpState = ()>(pub PhantomData<CpState>, pub PhantomData<CpEvent>);

A placeholder element.

This does not represent a blank area or a zero-sized widget. Rather, this represents the absence of a widget. So, for instance:

Column!(
    Label::new("Hello world!"),
    EmptyElement::new(),
)

is equivalent to:

Column!(
    Label::new("Hello world!"),
)

in terms of layout computation and everything else.

Events

Doesn’t emit events.

Implementations

impl<CpEvent, CpState> EmptyElement<CpEvent, CpState>

pub fn new() -> EmptyElement<CpEvent, CpState>

Trait Implementations

impl<CpEvent: Clone, CpState: Clone> Clone for EmptyElement<CpEvent, CpState>

fn clone(&self) -> EmptyElement<CpEvent, CpState>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<CpEvent, CpState> Debug for EmptyElement<CpEvent, CpState>

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

Formats the value using the given formatter.

impl<CpEvent, CpState> Default for EmptyElement<CpEvent, CpState>

fn default() -> Self

Returns the “default value” for a type.

impl<CpEvent, CpState> Element<CpEvent, CpState> for EmptyElement<CpEvent, CpState>

type Event = NoEvent

The type of events this element can raise.

type AggregateChildrenState = ()

type BuildOutput = EmptyElementData<CpEvent, CpState>

fn build(self, _prev_state: ()) -> (EmptyElementData<CpEvent, CpState>, ())

impl<CpEvent: Eq, CpState: Eq> Eq for EmptyElement<CpEvent, CpState>

impl<CpEvent: Hash, CpState: Hash> Hash for EmptyElement<CpEvent, CpState>

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

Feeds this value into the given Hasher.

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

Feeds a slice of this type into the given Hasher.

impl<CpEvent: PartialEq, CpState: PartialEq> PartialEq<EmptyElement<CpEvent, CpState>> for EmptyElement<CpEvent, CpState>

fn eq(&self, other: &EmptyElement<CpEvent, CpState>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &EmptyElement<CpEvent, CpState>) -> bool

This method tests for !=.

impl<CpEvent, CpState> StructuralEq for EmptyElement<CpEvent, CpState>

impl<CpEvent, CpState> StructuralPartialEq for EmptyElement<CpEvent, CpState>