Struct Control 

pub struct Control { /* private fields */ }

A handle on the interaction unit a widget belongs to.

Reading any of these subscribes the caller, which is the point: a leaf that asks whether its control is hovered is thereby repainted when it changes.

Implementations

impl Control

pub fn widget(&self) -> WidgetId

The container that declared the boundary.

pub fn is_hovered(&self) -> bool

Whether the pointer is inside the control.

A disabled unit is never hovered and never pressed: it refuses the pointer, so it is not under one. The declaration is read first, so a control that is off does not subscribe to flags it would ignore.

pub fn is_pressed(&self) -> bool

Whether the pointer is down on the control.

pub fn has_focus(&self) -> bool

Whether the keyboard focus is inside the control’s subtree.

The path, rather than a walk of the unit’s descendants: the same question has to be answerable from a create_derived closure, which has no tree, and that is where a container resolves the text colour it publishes below it.

Gated on the declaration, like hover and press: a disabled unit shows no focus ring, which is what Qt, GTK and a <fieldset disabled> all show. A field that must go on saying the keyboard is its is not disabled — it is read-only, which is a different thing and keeps everything here.

pub fn is_enabled(&self) -> bool

Whether this unit, and every unit above it, takes input.

pub fn is_disabled(&self) -> bool

The complement, which is how a state layer reads it.

Trait Implementations

impl Clone for Control

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 Control