Struct VisualDensity 

pub struct VisualDensity {
    pub horizontal: f32,
    pub vertical: f32,
}

How compact the controls are — the reference’s VisualDensity.

Two numbers from −4 to 4, one per axis. Each step is four logical pixels on a control’s base size: a button at the compact density (−2, −2) is 8 px shorter than at the standard one, and its padding loses 8 px across. Zero is the standard density.

A theme carries one (Theme::visual_density). Unset, it follows the theme’s platform as the reference’s does (default_for_platform): standard on phones, compact on the desktops, where a pointer is precise and a screen holds more.

Fields

horizontal: f32

Across: negative is narrower.

vertical: f32

Down: negative is shorter.

Implementations

impl VisualDensity

pub const MINIMUM: f32 = -4.0

The smallest a density goes.

pub const MAXIMUM: f32 = 4.0

The largest a density goes.

pub const STANDARD: Self

The design’s own size.

pub const COMFORTABLE: Self

A step tighter than standard on both axes.

pub const COMPACT: Self

Two steps tighter on both axes: the desktops’ default.

pub fn new(horizontal: f32, vertical: f32) -> Self

A density of horizontal and vertical, each kept within MINIMUM..=MAXIMUM.

pub const fn default_for_platform(platform: TargetPlatform) -> Self

The density a platform’s controls have: standard on Android, iOS and Fuchsia, compact on Linux, macOS and Windows (theme_data.dart:3252).

pub fn base_size_adjustment(self) -> (f32, f32)

What it adds to a control’s base size, in logical pixels: four per step, on each axis (theme_data.dart:3307).

pub fn effective_min_size( self, (min_width, min_height): (f32, f32), (max_width, max_height): (f32, f32), ) -> (f32, f32)

A minimum size, adjusted: min_width and min_height moved by the adjustment, never below zero nor above max_width and max_height (theme_data.dart:3332).

pub fn lerp(a: Self, b: Self, t: f32) -> Self

Between a and b at t.

Trait Implementations

impl Clone for VisualDensity

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for VisualDensity

impl Debug for VisualDensity

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

Formats the value using the given formatter.

impl Default for VisualDensity

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for VisualDensity

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for VisualDensity