Struct EmulateMediaBuilder 

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

Builder for emulating CSS media features on a page.

Use this to test how your application responds to different media preferences like dark mode, print media, reduced motion, and forced colors.

Example

use viewpoint_core::{ColorScheme, ReducedMotion};
use viewpoint_core::page::MediaType;

// Emulate dark mode
page.emulate_media()
    .color_scheme(ColorScheme::Dark)
    .apply()
    .await.unwrap();

// Emulate print media
page.emulate_media()
    .media(MediaType::Print)
    .apply()
    .await.unwrap();

// Combine multiple settings
page.emulate_media()
    .color_scheme(ColorScheme::Dark)
    .reduced_motion(ReducedMotion::Reduce)
    .apply()
    .await.unwrap();

// Clear all media emulation
page.emulate_media()
    .clear()
    .await.unwrap();

Implementations

impl<'a> EmulateMediaBuilder<'a>

pub fn media(self, media: MediaType) -> Self

Set the CSS media type (screen or print).

pub fn color_scheme(self, color_scheme: ColorScheme) -> Self

Set the color scheme preference.

This affects CSS prefers-color-scheme media queries.

pub fn reduced_motion(self, reduced_motion: ReducedMotion) -> Self

Set the reduced motion preference.

This affects CSS prefers-reduced-motion media queries.

pub fn forced_colors(self, forced_colors: ForcedColors) -> Self

Set the forced colors preference.

This affects CSS forced-colors media queries.

pub async fn apply(self) -> Result<(), PageError>

Apply the media emulation settings.

Errors

Returns an error if the CDP command fails.

pub async fn clear(self) -> Result<(), PageError>

Clear all media emulation.

This resets media type and all media features to their defaults.

Errors

Returns an error if the CDP command fails.

Trait Implementations

impl<'a> Debug for EmulateMediaBuilder<'a>

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

Formats the value using the given formatter.