4 files changed, 61 insertions, 4 deletions

diff --git a/native/src/command/action.rs b/native/src/command/action.rs
index 3fb02899..a6954f8f 100644
--- a/native/src/command/action.rs
+++ b/native/src/command/action.rs
@@ -20,7 +20,7 @@ pub enum Action<T> {
     Clipboard(clipboard::Action<T>),
 
     /// Run a window action.
-    Window(window::Action),
+    Window(window::Action<T>),
 
     /// Run a system action.
     System(system::Action<T>),
@@ -46,7 +46,7 @@ impl<T> Action<T> {
         match self {
             Self::Future(future) => Action::Future(Box::pin(future.map(f))),
             Self::Clipboard(action) => Action::Clipboard(action.map(f)),
-            Self::Window(window) => Action::Window(window),
+            Self::Window(window) => Action::Window(window.map(f)),
             Self::System(system) => Action::System(system.map(f)),
             Self::Widget(widget) => Action::Widget(widget.map(f)),
         }
diff --git a/native/src/window.rs b/native/src/window.rs
index 62487fb9..f910b8f2 100644
--- a/native/src/window.rs
+++ b/native/src/window.rs
@@ -1,6 +1,8 @@
 //! Build window-based GUI applications.
 mod action;
 mod event;
+mod mode;
 
 pub use action::Action;
 pub use event::Event;
+pub use mode::Mode;
diff --git a/native/src/window/action.rs b/native/src/window/action.rs
index 01294e83..d891c6ac 100644
--- a/native/src/window/action.rs
+++ b/native/src/window/action.rs
@@ -1,6 +1,10 @@
+use crate::window::Mode;
+
+use iced_futures::MaybeSend;
+use std::fmt;
+
 /// An operation to be performed on some window.
-#[derive(Debug)]
-pub enum Action {
+pub enum Action<T> {
     /// Resize the window.
     Resize {
         /// The new logical width of the window
@@ -15,4 +19,43 @@ pub enum Action {
         /// The new logical y location of the window
         y: i32,
     },
+    /// Set the [`Mode`] of the window.
+    SetMode(Mode),
+    /// Fetch the current [`Mode`] of the window.
+    FetchMode(Box<dyn FnOnce(Mode) -> T + 'static>),
+}
+
+impl<T> Action<T> {
+    /// Maps the output of a window [`Action`] using the provided closure.
+    pub fn map<A>(
+        self,
+        f: impl Fn(T) -> A + 'static + MaybeSend + Sync,
+    ) -> Action<A>
+    where
+        T: 'static,
+    {
+        match self {
+            Self::Resize { width, height } => Action::Resize { width, height },
+            Self::Move { x, y } => Action::Move { x, y },
+            Self::SetMode(mode) => Action::SetMode(mode),
+            Self::FetchMode(o) => Action::FetchMode(Box::new(move |s| f(o(s)))),
+        }
+    }
+}
+
+impl<T> fmt::Debug for Action<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::Resize { width, height } => write!(
+                f,
+                "Action::Resize {{ widget: {}, height: {} }}",
+                width, height
+            ),
+            Self::Move { x, y } => {
+                write!(f, "Action::Move {{ x: {}, y: {} }}", x, y)
+            }
+            Self::SetMode(mode) => write!(f, "Action::SetMode({:?})", mode),
+            Self::FetchMode(_) => write!(f, "Action::FetchMode"),
+        }
+    }
 }
diff --git a/native/src/window/mode.rs b/native/src/window/mode.rs
new file mode 100644
index 00000000..fdce8e23
--- /dev/null
+++ b/native/src/window/mode.rs
@@ -0,0 +1,12 @@
+/// The mode of a window-based application.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Mode {
+    /// The application appears in its own window.
+    Windowed,
+
+    /// The application takes the whole screen of its current monitor.
+    Fullscreen,
+
+    /// The application is hidden
+    Hidden,
+}