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use crate::clipboard;
use crate::core::widget;
use crate::font;
use crate::futures::MaybeSend;
use crate::system;
use crate::window;
use std::any::Any;
use std::borrow::Cow;
use std::fmt;
/// An action that a [`Command`] can perform.
///
/// [`Command`]: crate::Command
pub enum Action<T> {
/// Run a [`Future`] to completion.
///
/// [`Future`]: iced_futures::BoxFuture
Future(iced_futures::BoxFuture<T>),
/// Run a [`Stream`] to completion.
///
/// [`Stream`]: iced_futures::BoxStream
Stream(iced_futures::BoxStream<T>),
/// Run a clipboard action.
Clipboard(clipboard::Action<T>),
/// Run a window action.
Window(window::Action<T>),
/// Run a system action.
System(system::Action<T>),
/// Run a widget action.
Widget(Box<dyn widget::Operation<T>>),
/// Load a font from its bytes.
LoadFont {
/// The bytes of the font to load.
bytes: Cow<'static, [u8]>,
/// The message to produce when the font has been loaded.
tagger: Box<dyn Fn(Result<(), font::Error>) -> T>,
},
/// A custom action supported by a specific runtime.
Custom(Box<dyn Any>),
}
impl<T> Action<T> {
/// Applies a transformation to the result of a [`Command`].
///
/// [`Command`]: crate::Command
pub fn map<A>(
self,
f: impl Fn(T) -> A + 'static + MaybeSend + Sync,
) -> Action<A>
where
A: 'static,
T: 'static,
{
use iced_futures::futures::{FutureExt, StreamExt};
match self {
Self::Future(future) => Action::Future(Box::pin(future.map(f))),
Self::Stream(stream) => Action::Stream(Box::pin(stream.map(f))),
Self::Clipboard(action) => Action::Clipboard(action.map(f)),
Self::Window(window) => Action::Window(window.map(f)),
Self::System(system) => Action::System(system.map(f)),
Self::Widget(operation) => {
Action::Widget(Box::new(widget::operation::map(operation, f)))
}
Self::LoadFont { bytes, tagger } => Action::LoadFont {
bytes,
tagger: Box::new(move |result| f(tagger(result))),
},
Self::Custom(custom) => Action::Custom(custom),
}
}
}
impl<T> fmt::Debug for Action<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Future(_) => write!(f, "Action::Future"),
Self::Stream(_) => write!(f, "Action::Stream"),
Self::Clipboard(action) => {
write!(f, "Action::Clipboard({action:?})")
}
Self::Window(action) => {
write!(f, "Action::Window({action:?})")
}
Self::System(action) => write!(f, "Action::System({action:?})"),
Self::Widget(_action) => write!(f, "Action::Widget"),
Self::LoadFont { .. } => write!(f, "Action::LoadFont"),
Self::Custom(_) => write!(f, "Action::Custom"),
}
}
}
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