Trait Widget 

pub trait Widget {
    // Required method
    fn ui(self, ui: &mut Ui) -> Response;
}

Anything implementing Widget can be added to a Ui with Ui::add.

Button, Label, Slider, etc all implement the Widget trait.

You only need to implement Widget if you care about being able to do ui.add(your_widget);.

Note that the widgets (Button, TextEdit etc) are builders, and not objects that hold state.

Tip: you can impl Widget for &mut YourThing { }.

|ui: &mut Ui| -> Response { … } also implements Widget.

Required Methods

fn ui(self, ui: &mut Ui) -> Response

Allocate space, interact, paint, and return a Response.

Note that this consumes self. This is because most widgets (Button, TextEdit etc) are builders

Tip: you can impl Widget for &mut YourObject { }.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl Widget for &PaintStats

fn ui(self, ui: &mut Ui) -> Response

impl Widget for &mut TessellationOptions

fn ui(self, ui: &mut Ui) -> Response

Implementors

impl Widget for &mut Frame

impl Widget for &mut CornerRadius

impl Widget for &mut FontTweak

impl Widget for &mut Margin

impl Widget for &mut Shadow

impl Widget for &mut Stroke

impl Widget for AtomLayout<'_>

impl Widget for Button<'_>

impl Widget for Checkbox<'_>

impl Widget for DragValue<'_>

impl Widget for Hyperlink

impl Widget for Image<'_>

impl Widget for ImageButton<'_>

impl Widget for Label

impl Widget for Link

impl Widget for ProgressBar

impl Widget for RadioButton<'_>

impl Widget for Separator

impl Widget for Slider<'_>

impl Widget for Spinner

impl Widget for TextEdit<'_>

impl<F> Widget for F

where F: FnOnce(&mut Ui) -> Response,

This enables functions that return impl Widget, so that you can create a widget by just returning a lambda from a function.

For instance: ui.add(slider_vec2(&mut vec2)); with:

pub fn slider_vec2(value: &mut egui::Vec2) -> impl egui::Widget + '_ {
   move |ui: &mut egui::Ui| {
       ui.horizontal(|ui| {
           ui.add(egui::Slider::new(&mut value.x, 0.0..=1.0).text("x"));
           ui.add(egui::Slider::new(&mut value.y, 0.0..=1.0).text("y"));
       })
       .response
   }
}