Trait ClassViewParts 

pub trait ClassViewParts {
    // Required methods
    fn is_present(&self) -> bool;
    fn into_view_parts(self, cx: &Cx, parts: &mut PartsWriter<'_>);
}

Converts a value used as a class list entry into view parts.

When this trait is implemented on a type, it can be used as an entry in the class! macro or stored in a Class directly.

A class list separates its entries with single spaces. An absent entry must not produce a separator, so is_present is the hook that makes that decision: the built-in Option<T> implementation reports None as absent, and the string implementations report empty strings as absent.

Required Methods

fn is_present(&self) -> bool

Returns whether this value contributes to the class list.

An absent value is skipped entirely and does not produce a separating space.

fn into_view_parts(self, cx: &Cx, parts: &mut PartsWriter<'_>)

Appends this value to the class list being built.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl ClassViewParts for &String

fn is_present(&self) -> bool

fn into_view_parts(self, cx: &Cx, parts: &mut PartsWriter<'_>)

impl ClassViewParts for &str

fn is_present(&self) -> bool

fn into_view_parts(self, _cx: &Cx, parts: &mut PartsWriter<'_>)

impl ClassViewParts for Cow<'static, str>

fn is_present(&self) -> bool

fn into_view_parts(self, _cx: &Cx, parts: &mut PartsWriter<'_>)

impl ClassViewParts for String

fn is_present(&self) -> bool

fn into_view_parts(self, _cx: &Cx, parts: &mut PartsWriter<'_>)

impl<T> ClassViewParts for Option<T>

where T: ClassViewParts,

fn is_present(&self) -> bool

fn into_view_parts(self, cx: &Cx, parts: &mut PartsWriter<'_>)

Implementors

impl ClassViewParts for &ViewPart

impl ClassViewParts for ViewPart

An attribute value, such as one taken from an Attributes collection with get, spliced in as a single entry.

impl<T> ClassViewParts for Class<T>

where T: ClassEntries,