Struct druid::BoxConstraints

pub struct BoxConstraints { /* fields omitted */ }

Constraints for layout.

The layout strategy for druid is strongly inspired by Flutter, and this struct is similar to the Flutter BoxConstraints class.

At the moment, it represents simply a minimum and maximum size. A widget's layout method should choose an appropriate size that meets these constraints.

Further, a container widget should compute appropriate constraints for each of its child widgets, and pass those down when recursing.

Methods

impl BoxConstraints

pub fn new(min: Size, max: Size) -> BoxConstraints

Create a new box constraints object.

Create constraints based on minimum and maximum size.

pub fn tight(size: Size) -> BoxConstraints

Create a "tight" box constraints object.

A "tight" constraint can only be satisfied by a single size.

pub fn loosen(&self) -> BoxConstraints

Create a "loose" version of the constraints.

Make a version with zero minimum size, but the same maximum size.

pub fn constrain(&self, size: impl Into<Size>) -> Size

Clamp a given size so that fits within the constraints.

pub fn max(&self) -> Size

Returns the max size of these constraints.

pub fn min(&self) -> Size

Returns the min size of these constraints.

pub fn is_width_bounded(&self) -> bool

Whether there is an upper bound on the width.

pub fn is_height_bounded(&self) -> bool

Whether there is an upper bound on the height.

pub fn debug_check(&self, name: &str)

Check to see if these constraints are legit.

Logs a warning if BoxConstraints are invalid.

Trait Implementations

impl Clone for BoxConstraints

fn clone(&self) -> BoxConstraints

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for BoxConstraints

impl Debug for BoxConstraints

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

Formats the value using the given formatter.