Add application feature, which allows to build freestanding wgpu app

Cargo.toml

@@ -13,7 +13,8 @@ categories = ["gui"]
 resolver = "2"
 
 [features]
-default = ["wgpu"]
+default = ["wgpu", "application"]
+application = ["iced_winit/application"]
 # Enables the `iced_wgpu` renderer
 wgpu = ["iced_wgpu"]
 # Enables the `Image` widget

native/src/lib.rs

@@ -92,5 +92,5 @@ pub use renderer::Renderer;
 pub use runtime::Runtime;
 pub use shell::Shell;
 pub use subscription::Subscription;
-pub use user_interface::UserInterface;
+pub use user_interface::{Cache, UserInterface};
 pub use widget::Widget;

src/lib.rs

@@ -180,10 +180,13 @@
 #![forbid(unsafe_code)]
 #![forbid(rust_2018_idioms)]
 #![cfg_attr(docsrs, feature(doc_cfg))]
+
+#[cfg(feature = "application")]
 mod application;
 mod element;
 mod error;
 mod result;
+#[cfg(feature = "application")]
 mod sandbox;
 
 pub mod clipboard;
@@ -210,11 +213,13 @@ use iced_glow as renderer;
 #[doc(no_inline)]
 pub use widget::*;
 
+#[cfg(feature = "application")]
 pub use application::Application;
 pub use element::Element;
 pub use error::Error;
 pub use executor::Executor;
 pub use result::Result;
+#[cfg(feature = "application")]
 pub use sandbox::Sandbox;
 pub use settings::Settings;
 

winit/Cargo.toml

@@ -12,6 +12,7 @@ categories = ["gui"]
 
 [features]
 debug = ["iced_native/debug"]
+application = []
 
 [dependencies]
 window_clipboard = "0.2"

winit/src/lib.rs

@@ -27,6 +27,7 @@
 pub use iced_native::*;
 pub use winit;
 
+#[cfg(feature = "application")]
 pub mod application;
 pub mod clipboard;
 pub mod conversion;
@@ -38,6 +39,7 @@ mod mode;
 mod position;
 mod proxy;
 
+#[cfg(feature = "application")]
 pub use application::Application;
 pub use clipboard::Clipboard;
 pub use error::Error;