chore: updates after iced rebase

src/utils/state.rs

@@ -0,0 +1,222 @@
+use super::iced::IcedProgram as Program;
+use cosmic::iced::core::event::{self, Event};
+use cosmic::iced::core::mouse;
+use cosmic::iced::core::renderer;
+use cosmic::iced::core::widget::operation::{self, Operation};
+use cosmic::iced::core::{Clipboard, Size};
+use cosmic::iced_core;
+use cosmic::iced_runtime::Task;
+use cosmic::iced_runtime::user_interface::{self, UserInterface};
+
+/// The execution state of a [`Program`]. It leverages caching, event
+/// processing, and rendering primitive storage.
+#[allow(missing_debug_implementations)]
+pub struct State<P>
+where
+    P: Program + 'static,
+{
+    program: P,
+    cache: Option<user_interface::Cache>,
+    queued_events: Vec<Event>,
+    queued_messages: Vec<P::Message>,
+    mouse_interaction: mouse::Interaction,
+}
+
+impl<P> State<P>
+where
+    P: Program + 'static,
+{
+    /// Creates a new [`State`] with the provided [`Program`], initializing its
+    /// primitive with the given logical bounds and renderer.
+    pub fn new(
+        id: iced_core::id::Id,
+        mut program: P,
+        bounds: Size,
+        renderer: &mut cosmic::Renderer,
+    ) -> Self {
+        let user_interface = build_user_interface(
+            id,
+            &mut program,
+            user_interface::Cache::default(),
+            renderer,
+            bounds,
+        );
+
+        let cache = Some(user_interface.into_cache());
+
+        State {
+            program,
+            cache,
+            queued_events: Vec::new(),
+            queued_messages: Vec::new(),
+            mouse_interaction: mouse::Interaction::None,
+        }
+    }
+
+    /// Returns a reference to the [`Program`] of the [`State`].
+    pub fn program(&self) -> &P {
+        &self.program
+    }
+
+    /// Queues an event in the [`State`] for processing during an [`update`].
+    ///
+    /// [`update`]: Self::update
+    pub fn queue_event(&mut self, event: Event) {
+        self.queued_events.push(event);
+    }
+
+    /// Queues a message in the [`State`] for processing during an [`update`].
+    ///
+    /// [`update`]: Self::update
+    pub fn queue_message(&mut self, message: P::Message) {
+        self.queued_messages.push(message);
+    }
+
+    /// Returns whether the event queue of the [`State`] is empty or not.
+    pub fn is_queue_empty(&self) -> bool {
+        self.queued_events.is_empty() && self.queued_messages.is_empty()
+    }
+
+    /// Returns the current [`mouse::Interaction`] of the [`State`].
+    pub fn mouse_interaction(&self) -> mouse::Interaction {
+        self.mouse_interaction
+    }
+
+    /// Processes all the queued events and messages, rebuilding and redrawing
+    /// the widgets of the linked [`Program`] if necessary.
+    ///
+    /// Returns a list containing the instances of [`Event`] that were not
+    /// captured by any widget, and the [`Task`] obtained from [`Program`]
+    /// after updating it, only if an update was necessary.
+    pub fn update(
+        &mut self,
+        id: iced_core::id::Id,
+        bounds: Size,
+        cursor: mouse::Cursor,
+        renderer: &mut cosmic::Renderer,
+        theme: &cosmic::Theme,
+        style: &renderer::Style,
+        clipboard: &mut dyn Clipboard,
+    ) -> (Vec<Event>, Option<Task<P::Message>>) {
+        let mut user_interface = build_user_interface(
+            id.clone(),
+            &mut self.program,
+            self.cache.take().unwrap(),
+            renderer,
+            bounds,
+        );
+
+        let mut messages = Vec::new();
+
+        let (state, event_statuses) = user_interface.update(
+            &self.queued_events,
+            cursor,
+            renderer,
+            clipboard,
+            &mut messages,
+        );
+
+        let uncaptured_events = self
+            .queued_events
+            .iter()
+            .zip(event_statuses)
+            .filter_map(|(event, status)| matches!(status, event::Status::Ignored).then_some(event))
+            .cloned()
+            .collect();
+
+        self.queued_events.clear();
+        messages.append(&mut self.queued_messages);
+
+        let task = if messages.is_empty() {
+            if let cosmic::iced_runtime::user_interface::State::Updated {
+                mouse_interaction, ..
+            } = state
+            {
+                self.mouse_interaction = mouse_interaction;
+            }
+
+            user_interface.draw(renderer, theme, style, cursor);
+
+            self.cache = Some(user_interface.into_cache());
+
+            None
+        } else {
+            // When there are messages, we are forced to rebuild twice
+            // for now :^)
+            let temp_cache = user_interface.into_cache();
+
+            let tasks = Task::batch(messages.into_iter().map(|message| {
+                let task = self.program.update(message);
+
+                task
+            }));
+
+            let mut user_interface =
+                build_user_interface(id, &mut self.program, temp_cache, renderer, bounds);
+
+            if let cosmic::iced_runtime::user_interface::State::Updated {
+                mouse_interaction, ..
+            } = state
+            {
+                self.mouse_interaction = mouse_interaction;
+            }
+
+            user_interface.draw(renderer, theme, style, cursor);
+
+            self.cache = Some(user_interface.into_cache());
+
+            Some(tasks)
+        };
+
+        (uncaptured_events, task)
+    }
+
+    /// Applies [`Operation`]s to the [`State`]
+    pub fn operate(
+        &mut self,
+        id: iced_core::id::Id,
+        renderer: &mut cosmic::Renderer,
+        operations: impl Iterator<Item = Box<dyn Operation>>,
+        bounds: Size,
+    ) {
+        let mut user_interface = build_user_interface(
+            id,
+            &mut self.program,
+            self.cache.take().unwrap(),
+            renderer,
+            bounds,
+        );
+
+        for operation in operations {
+            let mut current_operation = Some(operation);
+
+            while let Some(mut operation) = current_operation.take() {
+                user_interface.operate(renderer, operation.as_mut());
+
+                match operation.finish() {
+                    operation::Outcome::None => {}
+                    operation::Outcome::Some(()) => {}
+                    operation::Outcome::Chain(next) => {
+                        current_operation = Some(next);
+                    }
+                };
+            }
+        }
+
+        self.cache = Some(user_interface.into_cache());
+    }
+}
+
+fn build_user_interface<'a, P: Program>(
+    _id: iced_core::id::Id,
+    program: &'a mut P,
+    cache: user_interface::Cache,
+    renderer: &mut cosmic::Renderer,
+    size: Size,
+) -> UserInterface<'a, P::Message, cosmic::Theme, cosmic::Renderer> {
+    let view = program.view();
+
+    let user_interface = UserInterface::build(view, size, cache, renderer);
+
+    user_interface
+}