Struct druid::ScaledArea

pub struct ScaledArea { /* private fields */ }

A specific area scaling state.

This holds the platform area size in pixels and the logical area size in display points.

The platform area size in pixels tends to be limited to integers and ScaledArea works under that assumption.

The logical area size in display points is an unrounded conversion, which means that it is often not limited to integers. This allows for accurate calculations of the platform area pixel boundaries from the logical area using a Scale.

Even though the logical area size can be fractional, the integer boundaries of that logical area will still match up with the platform area pixel boundaries as often as the scale factor allows.

A copy of ScaledArea will be stale as soon as the platform area size changes.

Implementations

impl ScaledArea

pub fn from_px<T>(size: T, scale: Scale) -> ScaledAreawhere T: Into<Size>,

Create a new scaled area from pixels.

pub fn from_dp<T>(size: T, scale: Scale) -> ScaledAreawhere T: Into<Size>,

Create a new scaled area from display points.

The calculated size in pixels is rounded away from zero to integers. That means that the scaled area size in display points isn’t always the same as the size given to this function. To find out the new size in points use size_dp.

pub fn size_dp(&self) -> Size

Returns the scaled area size in display points.

pub fn size_px(&self) -> Size

Returns the scaled area size in pixels.

Trait Implementations

impl Clone for ScaledArea

fn clone(&self) -> ScaledArea

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ScaledArea

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

Formats the value using the given formatter.

impl Default for ScaledArea

fn default() -> ScaledArea

Returns the “default value” for a type.

impl PartialEq<ScaledArea> for ScaledArea

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for ScaledArea

impl StructuralPartialEq for ScaledArea