Introduce Program API

src/lib.rs

@@ -175,6 +175,7 @@ mod error;
 mod sandbox;
 
 pub mod application;
+pub mod program;
 pub mod settings;
 pub mod time;
 pub mod window;
@@ -308,6 +309,7 @@ pub use error::Error;
 pub use event::Event;
 pub use executor::Executor;
 pub use font::Font;
+pub use program::Program;
 pub use renderer::Renderer;
 pub use sandbox::Sandbox;
 pub use settings::Settings;
@@ -327,3 +329,49 @@ pub type Element<
 ///
 /// [`Application`]: crate::Application
 pub type Result = std::result::Result<(), Error>;
+
+/// Runs a basic iced application with default [`Settings`] given
+///   - its window title,
+///   - its update logic,
+///   - and its view logic.
+///
+/// # Example
+/// ```no_run
+/// use iced::widget::{button, column, text, Column};
+///
+/// pub fn main() -> iced::Result {
+///     iced::run("A counter", update, view)
+/// }
+///
+/// #[derive(Debug, Clone)]
+/// enum Message {
+///     Increment,
+/// }
+///
+/// fn update(value: &mut u64, message: Message) {
+///     match message {
+///         Message::Increment => *value += 1,
+///     }
+/// }
+///
+/// fn view(value: &u64) -> Column<Message> {
+///     column![
+///         text(value),
+///         button("+").on_press(Message::Increment),
+///     ]
+/// }
+/// ```
+pub fn run<State, Message>(
+    title: &'static str,
+    update: impl Fn(&mut State, Message) + 'static,
+    view: impl for<'a> program::View<'a, State, Message> + 'static,
+) -> Result
+where
+    State: Default + 'static,
+    Message: std::fmt::Debug + Send + 'static,
+{
+    sandbox(update, view).title(title).run()
+}
+
+#[doc(inline)]
+pub use program::{application, sandbox};