Struct ViewportDescription

pub struct ViewportDescription {
    pub initial_scale: Scale<f32, CSSPixel, DeviceIndependentPixel>,
    pub minimum_scale: Scale<f32, CSSPixel, DeviceIndependentPixel>,
    pub maximum_scale: Scale<f32, CSSPixel, DeviceIndependentPixel>,
    pub user_scalable: UserScalable,
}

A set of viewport descriptors:

https://www.w3.org/TR/css-viewport-1/#viewport-meta

Fields

initial_scale: Scale<f32, CSSPixel, DeviceIndependentPixel>

https://developer.mozilla.org/en-US/docs/Web/HTML/Viewport_meta_tag#initial-scale the zoom level when the page is first loaded

minimum_scale: Scale<f32, CSSPixel, DeviceIndependentPixel>

https://developer.mozilla.org/en-US/docs/Web/HTML/Viewport_meta_tag#minimum_scale how much zoom out is allowed on the page.

maximum_scale: Scale<f32, CSSPixel, DeviceIndependentPixel>

https://developer.mozilla.org/en-US/docs/Web/HTML/Viewport_meta_tag#maximum_scale how much zoom in is allowed on the page

user_scalable: UserScalable

https://developer.mozilla.org/en-US/docs/Web/HTML/Viewport_meta_tag#user_scalable whether zoom in and zoom out actions are allowed on the page

Implementations

impl ViewportDescription

fn process_viewport_key_value_pairs( pairs: HashMap<String, String>, ) -> ViewportDescription

Iterates over the key-value pairs generated from meta tag and returns a ViewportDescription

fn parse_viewport_value_as_zoom( value: &str, ) -> Option<Scale<f32, CSSPixel, DeviceIndependentPixel>>

Parses a viewport zoom value.

pub fn clamp_zoom(&self, zoom: f32) -> f32

Constrains a zoom value within the allowed scale range

Trait Implementations

impl Clone for ViewportDescription

fn clone(&self) -> ViewportDescription

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ViewportDescription

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

Formats the value using the given formatter.

impl Default for ViewportDescription

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ViewportDescription

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl FromStr for ViewportDescription

https://drafts.csswg.org/css-viewport/#parsing-algorithm

This implementation differs from the specified algorithm, but is equivalent because

1. It uses higher-level string operations to process string instead of character-by-character iteration.
2. Uses trim() operation to handle whitespace instead of explicitly handling throughout the parsing process.

type Err = ViewportDescriptionParseError

The associated error which can be returned from parsing.

fn from_str(string: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl PartialEq for ViewportDescription

fn eq(&self, other: &ViewportDescription) -> 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 Serialize for ViewportDescription

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ViewportDescription