eave_api/
widget.rs

1use std::fmt::Debug;
2
3use serde::de::DeserializeOwned;
4
5use crate::ui::{Item, Notice, Panel};
6use crate::{Effect, Subscription, Task};
7
8/// Something that sits in the bar, with an optional popover.
9///
10/// It follows the same Elm shape as the host: state lives in `Self`, changes arrive as messages in
11/// [`update`](Widget::update), and the views are pure functions of state. `update` must not block:
12/// do I/O in a [`Task`] or a [`Subscription`].
13pub trait Widget: Sized + 'static {
14    /// Options from this widget's entry in `config.toml`, minus the `widget` key.
15    ///
16    /// The entry may be empty, so use `#[serde(default)]` for options that have one.
17    type Config: DeserializeOwned;
18    type Message: Clone + Debug + Send + Sync + 'static;
19
20    fn new(config: Self::Config) -> (Self, Task<Self::Message>);
21
22    fn update(&mut self, message: Self::Message) -> Effect<Self::Message>;
23
24    fn subscription(&self) -> Subscription<Self::Message> {
25        Subscription::none()
26    }
27
28    /// What the widget shows in the bar.
29    fn item(&self) -> Item<Self::Message>;
30
31    /// The popover contents, if this widget has one.
32    ///
33    /// When it returns `Some` and the item has no `on_press`, a click on the item opens and
34    /// closes the popover. Returning `None` while the popover is open closes it.
35    fn popover(&self) -> Option<Panel<Self::Message>> {
36        None
37    }
38
39    /// Notifications to show on screen now, newest first.
40    ///
41    /// While there are any, the bar's right island turns into a panel of them, like a popover. The
42    /// host takes each one away once its key is no longer in the list. Keep the notices you mean to show in your state, and drop
43    /// one when it's dismissed or expires.
44    fn notices(&self) -> Vec<Notice<Self::Message>> {
45        Vec::new()
46    }
47}
eave_api/widget.rs

eave_api/
widget.rs
