Create `iced_widget` subcrate and re-organize the whole codebase

1 files changed, 0 insertions, 575 deletions

diff --git a/lazy/src/component.rs b/lazy/src/component.rs
deleted file mode 100644
index b23da9f7..00000000
--- a/lazy/src/component.rs
+++ /dev/null
@@ -1,575 +0,0 @@
-//! Build and reuse custom widgets using The Elm Architecture.
-use iced_native::event;
-use iced_native::layout::{self, Layout};
-use iced_native::mouse;
-use iced_native::overlay;
-use iced_native::renderer;
-use iced_native::widget;
-use iced_native::widget::tree::{self, Tree};
-use iced_native::{
-    Clipboard, Element, Length, Point, Rectangle, Shell, Size, Widget,
-};
-
-use ouroboros::self_referencing;
-use std::cell::RefCell;
-use std::marker::PhantomData;
-
-/// A reusable, custom widget that uses The Elm Architecture.
-///
-/// A [`Component`] allows you to implement custom widgets as if they were
-/// `iced` applications with encapsulated state.
-///
-/// In other words, a [`Component`] allows you to turn `iced` applications into
-/// custom widgets and embed them without cumbersome wiring.
-///
-/// A [`Component`] produces widgets that may fire an [`Event`](Component::Event)
-/// and update the internal state of the [`Component`].
-///
-/// Additionally, a [`Component`] is capable of producing a `Message` to notify
-/// the parent application of any relevant interactions.
-pub trait Component<Message, Renderer> {
-    /// The internal state of this [`Component`].
-    type State: Default;
-
-    /// The type of event this [`Component`] handles internally.
-    type Event;
-
-    /// Processes an [`Event`](Component::Event) and updates the [`Component`] state accordingly.
-    ///
-    /// It can produce a `Message` for the parent application.
-    fn update(
-        &mut self,
-        state: &mut Self::State,
-        event: Self::Event,
-    ) -> Option<Message>;
-
-    /// Produces the widgets of the [`Component`], which may trigger an [`Event`](Component::Event)
-    /// on user interaction.
-    fn view(&self, state: &Self::State) -> Element<'_, Self::Event, Renderer>;
-
-    /// Update the [`Component`] state based on the provided [`Operation`](widget::Operation)
-    ///
-    /// By default, it does nothing.
-    fn operate(
-        &self,
-        _state: &mut Self::State,
-        _operation: &mut dyn widget::Operation<Message>,
-    ) {
-    }
-}
-
-/// Turns an implementor of [`Component`] into an [`Element`] that can be
-/// embedded in any application.
-pub fn view<'a, C, Message, Renderer>(
-    component: C,
-) -> Element<'a, Message, Renderer>
-where
-    C: Component<Message, Renderer> + 'a,
-    C::State: 'static,
-    Message: 'a,
-    Renderer: iced_native::Renderer + 'a,
-{
-    Element::new(Instance {
-        state: RefCell::new(Some(
-            StateBuilder {
-                component: Box::new(component),
-                message: PhantomData,
-                state: PhantomData,
-                element_builder: |_| None,
-            }
-            .build(),
-        )),
-    })
-}
-
-struct Instance<'a, Message, Renderer, Event, S> {
-    state: RefCell<Option<State<'a, Message, Renderer, Event, S>>>,
-}
-
-#[self_referencing]
-struct State<'a, Message: 'a, Renderer: 'a, Event: 'a, S: 'a> {
-    component:
-        Box<dyn Component<Message, Renderer, Event = Event, State = S> + 'a>,
-    message: PhantomData<Message>,
-    state: PhantomData<S>,
-
-    #[borrows(component)]
-    #[covariant]
-    element: Option<Element<'this, Event, Renderer>>,
-}
-
-impl<'a, Message, Renderer, Event, S> Instance<'a, Message, Renderer, Event, S>
-where
-    S: Default,
-{
-    fn rebuild_element(&self, state: &S) {
-        let heads = self.state.borrow_mut().take().unwrap().into_heads();
-
-        *self.state.borrow_mut() = Some(
-            StateBuilder {
-                component: heads.component,
-                message: PhantomData,
-                state: PhantomData,
-                element_builder: |component| Some(component.view(state)),
-            }
-            .build(),
-        );
-    }
-
-    fn rebuild_element_with_operation(
-        &self,
-        state: &mut S,
-        operation: &mut dyn widget::Operation<Message>,
-    ) {
-        let heads = self.state.borrow_mut().take().unwrap().into_heads();
-
-        heads.component.operate(state, operation);
-
-        *self.state.borrow_mut() = Some(
-            StateBuilder {
-                component: heads.component,
-                message: PhantomData,
-                state: PhantomData,
-                element_builder: |component| Some(component.view(state)),
-            }
-            .build(),
-        );
-    }
-
-    fn with_element<T>(
-        &self,
-        f: impl FnOnce(&Element<'_, Event, Renderer>) -> T,
-    ) -> T {
-        self.with_element_mut(|element| f(element))
-    }
-
-    fn with_element_mut<T>(
-        &self,
-        f: impl FnOnce(&mut Element<'_, Event, Renderer>) -> T,
-    ) -> T {
-        self.state
-            .borrow_mut()
-            .as_mut()
-            .unwrap()
-            .with_element_mut(|element| f(element.as_mut().unwrap()))
-    }
-}
-
-impl<'a, Message, Renderer, Event, S> Widget<Message, Renderer>
-    for Instance<'a, Message, Renderer, Event, S>
-where
-    S: 'static + Default,
-    Renderer: iced_native::Renderer,
-{
-    fn tag(&self) -> tree::Tag {
-        struct Tag<T>(T);
-        tree::Tag::of::<Tag<S>>()
-    }
-
-    fn state(&self) -> tree::State {
-        tree::State::new(S::default())
-    }
-
-    fn children(&self) -> Vec<Tree> {
-        self.rebuild_element(&S::default());
-        self.with_element(|element| vec![Tree::new(element)])
-    }
-
-    fn diff(&self, tree: &mut Tree) {
-        self.rebuild_element(tree.state.downcast_ref());
-        self.with_element(|element| {
-            tree.diff_children(std::slice::from_ref(&element))
-        })
-    }
-
-    fn width(&self) -> Length {
-        self.with_element(|element| element.as_widget().width())
-    }
-
-    fn height(&self) -> Length {
-        self.with_element(|element| element.as_widget().height())
-    }
-
-    fn layout(
-        &self,
-        renderer: &Renderer,
-        limits: &layout::Limits,
-    ) -> layout::Node {
-        self.with_element(|element| {
-            element.as_widget().layout(renderer, limits)
-        })
-    }
-
-    fn on_event(
-        &mut self,
-        tree: &mut Tree,
-        event: iced_native::Event,
-        layout: Layout<'_>,
-        cursor_position: Point,
-        renderer: &Renderer,
-        clipboard: &mut dyn Clipboard,
-        shell: &mut Shell<'_, Message>,
-    ) -> event::Status {
-        let mut local_messages = Vec::new();
-        let mut local_shell = Shell::new(&mut local_messages);
-
-        let event_status = self.with_element_mut(|element| {
-            element.as_widget_mut().on_event(
-                &mut tree.children[0],
-                event,
-                layout,
-                cursor_position,
-                renderer,
-                clipboard,
-                &mut local_shell,
-            )
-        });
-
-        local_shell.revalidate_layout(|| shell.invalidate_layout());
-
-        if let Some(redraw_request) = local_shell.redraw_request() {
-            shell.request_redraw(redraw_request);
-        }
-
-        if !local_messages.is_empty() {
-            let mut heads = self.state.take().unwrap().into_heads();
-
-            for message in local_messages.into_iter().filter_map(|message| {
-                heads
-                    .component
-                    .update(tree.state.downcast_mut::<S>(), message)
-            }) {
-                shell.publish(message);
-            }
-
-            self.state = RefCell::new(Some(
-                StateBuilder {
-                    component: heads.component,
-                    message: PhantomData,
-                    state: PhantomData,
-                    element_builder: |state| {
-                        Some(state.view(tree.state.downcast_ref::<S>()))
-                    },
-                }
-                .build(),
-            ));
-
-            self.with_element(|element| {
-                tree.diff_children(std::slice::from_ref(&element))
-            });
-
-            shell.invalidate_layout();
-        }
-
-        event_status
-    }
-
-    fn operate(
-        &self,
-        tree: &mut Tree,
-        layout: Layout<'_>,
-        renderer: &Renderer,
-        operation: &mut dyn widget::Operation<Message>,
-    ) {
-        self.rebuild_element_with_operation(
-            tree.state.downcast_mut(),
-            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>,
-                operate_on_children: &mut dyn FnMut(
-                    &mut dyn widget::Operation<T>,
-                ),
-            ) {
-                self.operation.container(id, &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 text_input(
-                &mut self,
-                state: &mut dyn widget::operation::TextInput,
-                id: Option<&widget::Id>,
-            ) {
-                self.operation.text_input(state, id);
-            }
-        }
-
-        self.with_element(|element| {
-            tree.diff_children(std::slice::from_ref(&element));
-
-            element.as_widget().operate(
-                &mut tree.children[0],
-                layout,
-                renderer,
-                &mut MapOperation { operation },
-            );
-        });
-    }
-
-    fn draw(
-        &self,
-        tree: &Tree,
-        renderer: &mut Renderer,
-        theme: &Renderer::Theme,
-        style: &renderer::Style,
-        layout: Layout<'_>,
-        cursor_position: Point,
-        viewport: &Rectangle,
-    ) {
-        self.with_element(|element| {
-            element.as_widget().draw(
-                &tree.children[0],
-                renderer,
-                theme,
-                style,
-                layout,
-                cursor_position,
-                viewport,
-            );
-        });
-    }
-
-    fn mouse_interaction(
-        &self,
-        tree: &Tree,
-        layout: Layout<'_>,
-        cursor_position: Point,
-        viewport: &Rectangle,
-        renderer: &Renderer,
-    ) -> mouse::Interaction {
-        self.with_element(|element| {
-            element.as_widget().mouse_interaction(
-                &tree.children[0],
-                layout,
-                cursor_position,
-                viewport,
-                renderer,
-            )
-        })
-    }
-
-    fn overlay<'b>(
-        &'b mut self,
-        tree: &'b mut Tree,
-        layout: Layout<'_>,
-        renderer: &Renderer,
-    ) -> Option<overlay::Element<'b, Message, Renderer>> {
-        let overlay = OverlayBuilder {
-            instance: self,
-            tree,
-            types: PhantomData,
-            overlay_builder: |instance, tree| {
-                instance.state.get_mut().as_mut().unwrap().with_element_mut(
-                    move |element| {
-                        element.as_mut().unwrap().as_widget_mut().overlay(
-                            &mut tree.children[0],
-                            layout,
-                            renderer,
-                        )
-                    },
-                )
-            },
-        }
-        .build();
-
-        let has_overlay = overlay.with_overlay(|overlay| {
-            overlay.as_ref().map(overlay::Element::position)
-        });
-
-        has_overlay.map(|position| {
-            overlay::Element::new(
-                position,
-                Box::new(OverlayInstance {
-                    overlay: Some(overlay),
-                }),
-            )
-        })
-    }
-}
-
-#[self_referencing]
-struct Overlay<'a, 'b, Message, Renderer, Event, S> {
-    instance: &'a mut Instance<'b, Message, Renderer, Event, S>,
-    tree: &'a mut Tree,
-    types: PhantomData<(Message, Event, S)>,
-
-    #[borrows(mut instance, mut tree)]
-    #[covariant]
-    overlay: Option<overlay::Element<'this, Event, Renderer>>,
-}
-
-struct OverlayInstance<'a, 'b, Message, Renderer, Event, S> {
-    overlay: Option<Overlay<'a, 'b, Message, Renderer, Event, S>>,
-}
-
-impl<'a, 'b, Message, Renderer, Event, S>
-    OverlayInstance<'a, 'b, Message, Renderer, Event, S>
-{
-    fn with_overlay_maybe<T>(
-        &self,
-        f: impl FnOnce(&overlay::Element<'_, Event, Renderer>) -> T,
-    ) -> Option<T> {
-        self.overlay
-            .as_ref()
-            .unwrap()
-            .borrow_overlay()
-            .as_ref()
-            .map(f)
-    }
-
-    fn with_overlay_mut_maybe<T>(
-        &mut self,
-        f: impl FnOnce(&mut overlay::Element<'_, Event, Renderer>) -> T,
-    ) -> Option<T> {
-        self.overlay
-            .as_mut()
-            .unwrap()
-            .with_overlay_mut(|overlay| overlay.as_mut().map(f))
-    }
-}
-
-impl<'a, 'b, Message, Renderer, Event, S> overlay::Overlay<Message, Renderer>
-    for OverlayInstance<'a, 'b, Message, Renderer, Event, S>
-where
-    Renderer: iced_native::Renderer,
-    S: 'static + Default,
-{
-    fn layout(
-        &self,
-        renderer: &Renderer,
-        bounds: Size,
-        position: Point,
-    ) -> layout::Node {
-        self.with_overlay_maybe(|overlay| {
-            let translation = position - overlay.position();
-
-            overlay.layout(renderer, bounds, translation)
-        })
-        .unwrap_or_default()
-    }
-
-    fn draw(
-        &self,
-        renderer: &mut Renderer,
-        theme: &Renderer::Theme,
-        style: &renderer::Style,
-        layout: Layout<'_>,
-        cursor_position: Point,
-    ) {
-        let _ = self.with_overlay_maybe(|overlay| {
-            overlay.draw(renderer, theme, style, layout, cursor_position);
-        });
-    }
-
-    fn mouse_interaction(
-        &self,
-        layout: Layout<'_>,
-        cursor_position: Point,
-        viewport: &Rectangle,
-        renderer: &Renderer,
-    ) -> mouse::Interaction {
-        self.with_overlay_maybe(|overlay| {
-            overlay.mouse_interaction(
-                layout,
-                cursor_position,
-                viewport,
-                renderer,
-            )
-        })
-        .unwrap_or_default()
-    }
-
-    fn on_event(
-        &mut self,
-        event: iced_native::Event,
-        layout: Layout<'_>,
-        cursor_position: Point,
-        renderer: &Renderer,
-        clipboard: &mut dyn Clipboard,
-        shell: &mut Shell<'_, Message>,
-    ) -> iced_native::event::Status {
-        let mut local_messages = Vec::new();
-        let mut local_shell = Shell::new(&mut local_messages);
-
-        let event_status = self
-            .with_overlay_mut_maybe(|overlay| {
-                overlay.on_event(
-                    event,
-                    layout,
-                    cursor_position,
-                    renderer,
-                    clipboard,
-                    &mut local_shell,
-                )
-            })
-            .unwrap_or(iced_native::event::Status::Ignored);
-
-        local_shell.revalidate_layout(|| shell.invalidate_layout());
-
-        if !local_messages.is_empty() {
-            let overlay = self.overlay.take().unwrap().into_heads();
-            let mut heads = overlay.instance.state.take().unwrap().into_heads();
-
-            for message in local_messages.into_iter().filter_map(|message| {
-                heads
-                    .component
-                    .update(overlay.tree.state.downcast_mut::<S>(), message)
-            }) {
-                shell.publish(message);
-            }
-
-            *overlay.instance.state.borrow_mut() = Some(
-                StateBuilder {
-                    component: heads.component,
-                    message: PhantomData,
-                    state: PhantomData,
-                    element_builder: |state| {
-                        Some(state.view(overlay.tree.state.downcast_ref::<S>()))
-                    },
-                }
-                .build(),
-            );
-
-            overlay.instance.with_element(|element| {
-                overlay.tree.diff_children(std::slice::from_ref(&element))
-            });
-
-            self.overlay = Some(
-                OverlayBuilder {
-                    instance: overlay.instance,
-                    tree: overlay.tree,
-                    types: PhantomData,
-                    overlay_builder: |_, _| None,
-                }
-                .build(),
-            );
-
-            shell.invalidate_layout();
-        }
-
-        event_status
-    }
-
-    fn is_over(&self, layout: Layout<'_>, cursor_position: Point) -> bool {
-        self.with_overlay_maybe(|overlay| {
-            overlay.is_over(layout, cursor_position)
-        })
-        .unwrap_or_default()
-    }
-}