Enum ThemeMode 

pub enum ThemeMode {
    System,
    Light,
    Dark,
}

Re-export: size classes and orientation, so the application can drive its own responsive behaviour. Which of an application’s themes is on display (app.dart:57).

An application supplies a light theme and, if it has one, a dark theme; this says which of the two the framework picks. It is a question about the application, not about the device: Brightness is what the platform reports, and System is the mode that agrees to follow it.

The framework resolves this once a frame and fades between the answers, so an application never has to read the platform’s brightness or write a crossfade of its own.

Variants

System

Follow the platform: the dark theme where the system asks for a dark interface, the light one otherwise. The default, and the answer most applications want.

Light

The light theme, whatever the platform says.

Dark

The dark theme, whatever the platform says — falling back to the light one when the application has no dark theme to give.

Implementations

impl ThemeMode

pub const fn is_system(self) -> bool

Does this mode follow the platform?

pub const fn is_light(self) -> bool

Does this mode pin the light theme?

pub const fn is_dark(self) -> bool

Does this mode pin the dark theme?

pub const fn wants_dark(self, brightness: Brightness) -> bool

Does this mode want a dark interface on a platform reporting brightness?

The one line the whole light/dark decision comes down to (app.dart:1000), and the reason it lives here rather than in the shell: an application that shows a theme setting with a System entry needs the same answer to tick the right row.

Trait Implementations

impl Clone for ThemeMode

fn clone(&self) -> ThemeMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ThemeMode

impl Debug for ThemeMode

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

Formats the value using the given formatter.

impl Default for ThemeMode

fn default() -> ThemeMode

Returns the “default value” for a type.

impl Eq for ThemeMode

impl Hash for ThemeMode

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

where __H: Hasher,

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 PartialEq for ThemeMode

fn eq(&self, other: &ThemeMode) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ThemeMode