improv(context-drawer): import definitions and add map method

src/app/context_drawer.rs

@@ -62,4 +62,22 @@ impl<'a, Message: Clone + 'static> ContextDrawer<'a, Message> {
         self.footer = Some(footer.into());
         self
     }
+
+    pub fn map<Out: Clone + 'static>(
+        mut self,
+        on_message: fn(Message) -> Out,
+    ) -> ContextDrawer<'a, Out> {
+        ContextDrawer {
+            title: self.title,
+            content: self.content.map(on_message),
+            header: self.header.map(|el| el.map(on_message)),
+            footer: self.footer.map(|el| el.map(on_message)),
+            on_close: on_message(self.on_close),
+            header_actions: self
+                .header_actions
+                .into_iter()
+                .map(|el| el.map(on_message))
+                .collect(),
+        }
+    }
 }

src/app/mod.rs

@@ -10,6 +10,7 @@ mod action;
 pub use action::Action;
 use cosmic_config::CosmicConfigEntry;
 pub mod context_drawer;
+pub use context_drawer::{ContextDrawer, context_drawer};
 pub mod cosmic;
 #[cfg(all(feature = "winit", feature = "multi-window"))]
 pub(crate) mod multi_window;
@@ -22,7 +23,6 @@ use crate::prelude::*;
 use crate::theme::THEME;
 use crate::widget::{container, horizontal_space, id_container, menu, nav_bar, popover};
 use apply::Apply;
-use context_drawer::ContextDrawer;
 use iced::window;
 use iced::{Length, Subscription};
 pub use settings::Settings;

src/widget/context_drawer/widget.rs

@@ -164,12 +164,27 @@ impl<'a, Message: Clone + 'static> ContextDrawer<'a, Message> {
     }
 
     /// Sets the [`Id`] of the [`ContextDrawer`].
+    #[inline]
     pub fn id(mut self, id: iced_core::widget::Id) -> Self {
         self.id = Some(id);
         self
     }
 
-    // Optionally assigns message to `on_close` event.
+    /// Map the message type of the context drawer to another
+    #[inline]
+    pub fn map<Out: Clone + 'static>(
+        mut self,
+        on_message: fn(Message) -> Out,
+    ) -> ContextDrawer<'a, Out> {
+        ContextDrawer {
+            id: self.id,
+            content: self.content.map(on_message),
+            drawer: self.drawer.map(on_message),
+            on_close: self.on_close.map(on_message),
+        }
+    }
+
+    /// Optionally assigns message to `on_close` event.
     #[inline]
     pub fn on_close_maybe(mut self, message: Option<Message>) -> Self {
         self.on_close = message;