Struct Header 

pub struct Header<'a> { /* private fields */ }

Header Block

slack api docs 🔗

A header is a plain-text block that displays in a larger, bold font.

Use it to delineate between different groups of content in your app’s surfaces.

Implementations

impl<'a> Header<'a>

pub fn builder() -> HeaderBuilderInit<'a>

Build a new Header block.

Alias for build::HeaderBuilder::new().

pub fn validate(&self) -> Result<(), ValidationErrors>

Available on crate feature validation only.

Validate that this Header block agrees with Slack’s model requirements

Errors

• If text longer than 150 chars
• If block_id longer than 256 chars

Example

use slack_blocks::{blocks::Header, compose};

let long_string = |len| std::iter::repeat(' ').take(len).collect::<String>();
let assert_invalid = |block: &dyn Validate| match block.validate() {
  | Ok(()) => panic!("validation should have failed"),
  | Err(_) => (),
};

// block_id
let block = Header::builder().text("foo")
                             .block_id(long_string(256))
                             .build();

assert_invalid(&block);

// text
let block = Header::builder().text(long_string(151))
                             .block_id("foo")
                             .build();

assert_invalid(&block);

Trait Implementations

impl<'a> Clone for Header<'a>

fn clone(&self) -> Header<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Header<'a>

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

Formats the value using the given formatter.

impl<'de, 'a> Deserialize<'de> for Header<'a>

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'a> From<Header<'a>> for Block<'a>

fn from(src: Header<'a>) -> Self

Converts to this type from the input type.

impl<'a> Hash for Header<'a>

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

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<'a> PartialEq for Header<'a>

fn eq(&self, other: &Header<'a>) -> 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<'a> Serialize for Header<'a>

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<'a> Validate for Header<'a>

fn validate(&self) -> Result<(), ValidationErrors>

impl<'a> StructuralPartialEq for Header<'a>