Task API

.github/workflows/document.yml

@@ -8,7 +8,7 @@ jobs:
     steps:
     - uses: hecrj/setup-rust-action@v2
       with:
-        rust-version: nightly-2023-12-11
+        rust-version: nightly
     - uses: actions/checkout@v2
     - name: Generate documentation
       run: |

core/Cargo.toml

@@ -33,8 +33,5 @@ web-time.workspace = true
 dark-light.workspace = true
 dark-light.optional = true
 
-[target.'cfg(windows)'.dependencies]
-raw-window-handle.workspace = true
-
 [dev-dependencies]
 approx = "0.5"

core/src/element.rs

@@ -10,7 +10,6 @@ use crate::{
     Widget,
 };
 
-use std::any::Any;
 use std::borrow::Borrow;
 
 /// A generic [`Widget`].
@@ -305,63 +304,9 @@ where
         tree: &mut Tree,
         layout: Layout<'_>,
         renderer: &Renderer,
-        operation: &mut dyn widget::Operation<B>,
+        operation: &mut dyn widget::Operation<()>,
     ) {
-        struct MapOperation<'a, B> {
-            operation: &'a mut dyn widget::Operation<B>,
-        }
-
-        impl<'a, T, B> widget::Operation<T> for MapOperation<'a, B> {
-            fn container(
-                &mut self,
-                id: Option<&widget::Id>,
-                bounds: Rectangle,
-                operate_on_children: &mut dyn FnMut(
-                    &mut dyn widget::Operation<T>,
-                ),
-            ) {
-                self.operation.container(id, bounds, &mut |operation| {
-                    operate_on_children(&mut MapOperation { operation });
-                });
-            }
-
-            fn focusable(
-                &mut self,
-                state: &mut dyn widget::operation::Focusable,
-                id: Option<&widget::Id>,
-            ) {
-                self.operation.focusable(state, id);
-            }
-
-            fn scrollable(
-                &mut self,
-                state: &mut dyn widget::operation::Scrollable,
-                id: Option<&widget::Id>,
-                bounds: Rectangle,
-                translation: Vector,
-            ) {
-                self.operation.scrollable(state, id, bounds, translation);
-            }
-
-            fn text_input(
-                &mut self,
-                state: &mut dyn widget::operation::TextInput,
-                id: Option<&widget::Id>,
-            ) {
-                self.operation.text_input(state, id);
-            }
-
-            fn custom(&mut self, state: &mut dyn Any, id: Option<&widget::Id>) {
-                self.operation.custom(state, id);
-            }
-        }
-
-        self.widget.operate(
-            tree,
-            layout,
-            renderer,
-            &mut MapOperation { operation },
-        );
+        self.widget.operate(tree, layout, renderer, operation);
     }
 
     fn on_event(
@@ -495,7 +440,7 @@ where
         state: &mut Tree,
         layout: Layout<'_>,
         renderer: &Renderer,
-        operation: &mut dyn widget::Operation<Message>,
+        operation: &mut dyn widget::Operation<()>,
     ) {
         self.element
             .widget

core/src/overlay.rs

@@ -41,7 +41,7 @@ where
         &mut self,
         _layout: Layout<'_>,
         _renderer: &Renderer,
-        _operation: &mut dyn widget::Operation<Message>,
+        _operation: &mut dyn widget::Operation<()>,
     ) {
     }
 

core/src/overlay/element.rs

@@ -5,9 +5,7 @@ use crate::layout;
 use crate::mouse;
 use crate::renderer;
 use crate::widget;
-use crate::{Clipboard, Layout, Point, Rectangle, Shell, Size, Vector};
-
-use std::any::Any;
+use crate::{Clipboard, Layout, Point, Rectangle, Shell, Size};
 
 /// A generic [`Overlay`].
 #[allow(missing_debug_implementations)]
@@ -94,7 +92,7 @@ where
         &mut self,
         layout: Layout<'_>,
         renderer: &Renderer,
-        operation: &mut dyn widget::Operation<Message>,
+        operation: &mut dyn widget::Operation<()>,
     ) {
         self.overlay.operate(layout, renderer, operation);
     }
@@ -146,59 +144,9 @@ where
         &mut self,
         layout: Layout<'_>,
         renderer: &Renderer,
-        operation: &mut dyn widget::Operation<B>,
+        operation: &mut dyn widget::Operation<()>,
     ) {
-        struct MapOperation<'a, B> {
-            operation: &'a mut dyn widget::Operation<B>,
-        }
-
-        impl<'a, T, B> widget::Operation<T> for MapOperation<'a, B> {
-            fn container(
-                &mut self,
-                id: Option<&widget::Id>,
-                bounds: Rectangle,
-                operate_on_children: &mut dyn FnMut(
-                    &mut dyn widget::Operation<T>,
-                ),
-            ) {
-                self.operation.container(id, bounds, &mut |operation| {
-                    operate_on_children(&mut MapOperation { operation });
-                });
-            }
-
-            fn focusable(
-                &mut self,
-                state: &mut dyn widget::operation::Focusable,
-                id: Option<&widget::Id>,
-            ) {
-                self.operation.focusable(state, id);
-            }
-
-            fn scrollable(
-                &mut self,
-                state: &mut dyn widget::operation::Scrollable,
-                id: Option<&widget::Id>,
-                bounds: Rectangle,
-                translation: Vector,
-            ) {
-                self.operation.scrollable(state, id, bounds, translation);
-            }
-
-            fn text_input(
-                &mut self,
-                state: &mut dyn widget::operation::TextInput,
-                id: Option<&widget::Id>,
-            ) {
-                self.operation.text_input(state, id);
-            }
-
-            fn custom(&mut self, state: &mut dyn Any, id: Option<&widget::Id>) {
-                self.operation.custom(state, id);
-            }
-        }
-
-        self.content
-            .operate(layout, renderer, &mut MapOperation { operation });
+        self.content.operate(layout, renderer, operation);
     }
 
     fn on_event(

core/src/overlay/group.rs

@@ -132,7 +132,7 @@ where
         &mut self,
         layout: Layout<'_>,
         renderer: &Renderer,
-        operation: &mut dyn widget::Operation<Message>,
+        operation: &mut dyn widget::Operation<()>,
     ) {
         operation.container(None, layout.bounds(), &mut |operation| {
             self.children.iter_mut().zip(layout.children()).for_each(

core/src/widget.rs

@@ -105,7 +105,7 @@ where
         _state: &mut Tree,
         _layout: Layout<'_>,
         _renderer: &Renderer,
-        _operation: &mut dyn Operation<Message>,
+        _operation: &mut dyn Operation<()>,
     ) {
     }
 

core/src/widget/operation.rs

@@ -12,11 +12,11 @@ use crate::{Rectangle, Vector};
 
 use std::any::Any;
 use std::fmt;
-use std::rc::Rc;
+use std::sync::Arc;
 
 /// A piece of logic that can traverse the widget tree of an application in
 /// order to query or update some widget state.
-pub trait Operation<T> {
+pub trait Operation<T>: Send {
     /// Operates on a widget that contains other widgets.
     ///
     /// The `operate_on_children` function can be called to return control to
@@ -81,7 +81,7 @@ where
 /// Maps the output of an [`Operation`] using the given function.
 pub fn map<A, B>(
     operation: Box<dyn Operation<A>>,
-    f: impl Fn(A) -> B + 'static,
+    f: impl Fn(A) -> B + Send + Sync + 'static,
 ) -> impl Operation<B>
 where
     A: 'static,
@@ -90,7 +90,7 @@ where
     #[allow(missing_debug_implementations)]
     struct Map<A, B> {
         operation: Box<dyn Operation<A>>,
-        f: Rc<dyn Fn(A) -> B>,
+        f: Arc<dyn Fn(A) -> B + Send + Sync>,
     }
 
     impl<A, B> Operation<B> for Map<A, B>
@@ -197,7 +197,7 @@ where
 
     Map {
         operation,
-        f: Rc::new(f),
+        f: Arc::new(f),
     }
 }
 

core/src/window/settings/windows.rs

@@ -1,12 +1,8 @@
 //! Platform specific settings for Windows.
-use raw_window_handle::RawWindowHandle;
 
 /// The platform specific window settings of an application.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub struct PlatformSpecific {
-    /// Parent window
-    pub parent: Option<RawWindowHandle>,
-
     /// Drag and drop support
     pub drag_and_drop: bool,
 
@@ -17,7 +13,6 @@ pub struct PlatformSpecific {
 impl Default for PlatformSpecific {
     fn default() -> Self {
         Self {
-            parent: None,
             drag_and_drop: true,
             skip_taskbar: false,
         }

examples/editor/src/main.rs

@@ -4,7 +4,7 @@ use iced::widget::{
     button, column, container, horizontal_space, pick_list, row, text,
     text_editor, tooltip,
 };
-use iced::{Alignment, Command, Element, Font, Length, Subscription, Theme};
+use iced::{Alignment, Element, Font, Length, Subscription, Task, Theme};
 
 use std::ffi;
 use std::io;
@@ -51,42 +51,42 @@ impl Editor {
         }
     }
 
-    fn load() -> Command<Message> {
-        Command::perform(
+    fn load() -> Task<Message> {
+        Task::perform(
             load_file(format!("{}/src/main.rs", env!("CARGO_MANIFEST_DIR"))),
             Message::FileOpened,
         )
     }
 
-    fn update(&mut self, message: Message) -> Command<Message> {
+    fn update(&mut self, message: Message) -> Task<Message> {
         match message {
             Message::ActionPerformed(action) => {
                 self.is_dirty = self.is_dirty || action.is_edit();
 
                 self.content.perform(action);
 
-                Command::none()
+                Task::none()
             }
             Message::ThemeSelected(theme) => {
                 self.theme = theme;
 
-                Command::none()
+                Task::none()
             }
             Message::NewFile => {
                 if !self.is_loading {
                     self.file = None;
                     self.content = text_editor::Content::new();
                 }
 
-                Command::none()
+                Task::none()
             }
             Message::OpenFile => {
                 if self.is_loading {
-                    Command::none()
+                    Task::none()
                 } else {
                     self.is_loading = true;
 
-                    Command::perform(open_file(), Message::FileOpened)
+                    Task::perform(open_file(), Message::FileOpened)
                 }
             }
             Message::FileOpened(result) => {
@@ -98,15 +98,15 @@ impl Editor {
                     self.content = text_editor::Content::with_text(&contents);
                 }
 
-                Command::none()
+                Task::none()
             }
             Message::SaveFile => {
                 if self.is_loading {
-                    Command::none()
+                    Task::none()
                 } else {
                     self.is_loading = true;
 
-                    Command::perform(
+                    Task::perform(
                         save_file(self.file.clone(), self.content.text()),
                         Message::FileSaved,
                     )
@@ -120,7 +120,7 @@ impl Editor {
                     self.is_dirty = false;
                 }
 
-                Command::none()
+                Task::none()
             }
         }
     }