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//! This example showcases a drawing a quad.
mod quad {
use iced::advanced::layout::{self, Layout};
use iced::advanced::renderer;
use iced::advanced::widget::{self, Widget};
use iced::mouse;
use iced::{Color, Element, Length, Rectangle, Size};
pub struct CustomQuad {
size: f32,
radius: [f32; 4],
border_width: f32,
}
impl CustomQuad {
pub fn new(size: f32, radius: [f32; 4], border_width: f32) -> Self {
Self {
size,
radius,
border_width,
}
}
}
impl<Message, Renderer> Widget<Message, Renderer> for CustomQuad
where
Renderer: renderer::Renderer,
{
fn width(&self) -> Length {
Length::Shrink
}
fn height(&self) -> Length {
Length::Shrink
}
fn layout(
&self,
_tree: &mut widget::Tree,
_renderer: &Renderer,
_limits: &layout::Limits,
) -> layout::Node {
layout::Node::new(Size::new(self.size, self.size))
}
fn draw(
&self,
_state: &widget::Tree,
renderer: &mut Renderer,
_theme: &Renderer::Theme,
_style: &renderer::Style,
layout: Layout<'_>,
_cursor: mouse::Cursor,
_viewport: &Rectangle,
) {
renderer.fill_quad(
renderer::Quad {
bounds: layout.bounds(),
border_radius: self.radius.into(),
border_width: self.border_width,
border_color: Color::from_rgb(1.0, 0.0, 0.0),
},
Color::BLACK,
);
}
}
impl<'a, Message, Renderer> From<CustomQuad> for Element<'a, Message, Renderer>
where
Renderer: renderer::Renderer,
{
fn from(circle: CustomQuad) -> Self {
Self::new(circle)
}
}
}
use iced::widget::{column, container, slider, text};
use iced::{Alignment, Element, Length, Sandbox, Settings};
pub fn main() -> iced::Result {
Example::run(Settings::default())
}
struct Example {
radius: [f32; 4],
border_width: f32,
}
#[derive(Debug, Clone, Copy)]
#[allow(clippy::enum_variant_names)]
enum Message {
RadiusTopLeftChanged(f32),
RadiusTopRightChanged(f32),
RadiusBottomRightChanged(f32),
RadiusBottomLeftChanged(f32),
BorderWidthChanged(f32),
}
impl Sandbox for Example {
type Message = Message;
fn new() -> Self {
Self {
radius: [50.0; 4],
border_width: 0.0,
}
}
fn title(&self) -> String {
String::from("Custom widget - Iced")
}
fn update(&mut self, message: Message) {
let [tl, tr, br, bl] = self.radius;
match message {
Message::RadiusTopLeftChanged(radius) => {
self.radius = [radius, tr, br, bl];
}
Message::RadiusTopRightChanged(radius) => {
self.radius = [tl, radius, br, bl];
}
Message::RadiusBottomRightChanged(radius) => {
self.radius = [tl, tr, radius, bl];
}
Message::RadiusBottomLeftChanged(radius) => {
self.radius = [tl, tr, br, radius];
}
Message::BorderWidthChanged(width) => {
self.border_width = width;
}
}
}
fn view(&self) -> Element<Message> {
let [tl, tr, br, bl] = self.radius;
let content = column![
quad::CustomQuad::new(200.0, self.radius, self.border_width),
text(format!("Radius: {tl:.2}/{tr:.2}/{br:.2}/{bl:.2}")),
slider(1.0..=100.0, tl, Message::RadiusTopLeftChanged).step(0.01),
slider(1.0..=100.0, tr, Message::RadiusTopRightChanged).step(0.01),
slider(1.0..=100.0, br, Message::RadiusBottomRightChanged)
.step(0.01),
slider(1.0..=100.0, bl, Message::RadiusBottomLeftChanged)
.step(0.01),
slider(1.0..=10.0, self.border_width, Message::BorderWidthChanged)
.step(0.01),
]
.padding(20)
.spacing(20)
.max_width(500)
.align_items(Alignment::Center);
container(content)
.width(Length::Fill)
.height(Length::Fill)
.center_x()
.center_y()
.into()
}
}
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