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|
use iced::executor;
use iced::mouse;
use iced::subscription::{self, Subscription};
use iced::theme::{self, Theme};
use iced::widget::{column, container, scrollable, text, vertical_space};
use iced::{
Application, Command, Element, Event, Length, Point, Rectangle, Settings,
};
pub fn main() -> iced::Result {
Example::run(Settings::default())
}
struct Example {
mouse_position: Option<Point>,
outer_bounds: Option<Rectangle>,
inner_bounds: Option<Rectangle>,
}
#[derive(Debug, Clone, Copy)]
enum Message {
MouseMoved(Point),
Scrolled(scrollable::Viewport),
OuterBoundsFetched(Option<Rectangle>),
InnerBoundsFetched(Option<Rectangle>),
}
impl Application for Example {
type Message = Message;
type Theme = Theme;
type Flags = ();
type Executor = executor::Default;
fn new(_flags: Self::Flags) -> (Self, Command<Message>) {
(
Self {
mouse_position: None,
outer_bounds: None,
inner_bounds: None,
},
Command::none(),
)
}
fn title(&self) -> String {
String::from("Visible bounds - Iced")
}
fn update(&mut self, message: Message) -> Command<Message> {
match message {
Message::MouseMoved(position) => {
self.mouse_position = Some(position);
Command::none()
}
Message::Scrolled(_) => Command::batch(vec![
container::visible_bounds(OUTER_CONTAINER.clone())
.map(Message::OuterBoundsFetched),
container::visible_bounds(INNER_CONTAINER.clone())
.map(Message::InnerBoundsFetched),
]),
Message::OuterBoundsFetched(outer_bounds) => {
self.outer_bounds = outer_bounds;
Command::none()
}
Message::InnerBoundsFetched(inner_bounds) => {
self.inner_bounds = inner_bounds;
Command::none()
}
}
}
fn view(&self) -> Element<Message> {
let view_bounds = |label, bounds| {
text(format!(
"The {label} container is {}",
match bounds {
Some(bounds) => format!("visible at {:?}", bounds),
None => "not visible".to_string(),
}
))
};
column![
text(format!(
"Mouse position is {}",
match self.mouse_position {
Some(Point { x, y }) => format!("({x}, {y})"),
None => "unknown".to_string(),
}
)),
view_bounds("outer", self.outer_bounds),
view_bounds("inner", self.inner_bounds),
scrollable(
column![
text("Scroll me!"),
vertical_space(400),
container(text("I am the outer container!"))
.id(OUTER_CONTAINER.clone())
.padding(40)
.style(theme::Container::Box),
vertical_space(400),
scrollable(
column![
text("Scroll me!"),
vertical_space(400),
container(text("I am the inner container!"))
.id(INNER_CONTAINER.clone())
.padding(40)
.style(theme::Container::Box),
vertical_space(400)
]
.padding(20)
)
.on_scroll(Message::Scrolled)
.width(Length::Fill)
.height(300),
]
.padding(20)
)
.on_scroll(Message::Scrolled)
.width(Length::Fill)
.height(300),
]
.spacing(10)
.padding(20)
.into()
}
fn subscription(&self) -> Subscription<Message> {
subscription::events_with(|event, _| match event {
Event::Mouse(mouse::Event::CursorMoved { position }) => {
Some(Message::MouseMoved(position))
}
_ => None,
})
}
fn theme(&self) -> Theme {
Theme::Dark
}
}
use once_cell::sync::Lazy;
static OUTER_CONTAINER: Lazy<container::Id> =
Lazy::new(|| container::Id::new("outer"));
static INNER_CONTAINER: Lazy<container::Id> =
Lazy::new(|| container::Id::new("inner"));
|
