feat(widget): add toast widget

src/widget/toaster/widget.rs

@@ -0,0 +1,277 @@
+// Copyright 2024 wiiznokes
+// SPDX-License-Identifier: MPL-2.0
+
+use iced::{Limits, Size};
+use iced_core::layout::Node;
+
+use iced_core::event::{self, Event};
+use iced_core::layout;
+use iced_core::mouse;
+use iced_core::overlay;
+use iced_core::renderer::{self};
+use iced_core::widget::tree::Tree;
+use iced_core::widget::Operation;
+use iced_core::Element;
+use iced_core::Overlay;
+use iced_core::{Clipboard, Layout, Length, Point, Rectangle, Shell, Vector, Widget};
+use iced_renderer::core::widget::OperationOutputWrapper;
+
+pub struct Toaster<'a, Message, Theme, Renderer> {
+    toasts: Element<'a, Message, Theme, Renderer>,
+    content: Element<'a, Message, Theme, Renderer>,
+    is_empty: bool,
+}
+
+impl<'a, Message, Theme, Renderer> Toaster<'a, Message, Theme, Renderer> {
+    pub fn new(
+        toasts: Element<'a, Message, Theme, Renderer>,
+        content: Element<'a, Message, Theme, Renderer>,
+        is_empty: bool,
+    ) -> Self {
+        Self {
+            toasts,
+            content,
+            is_empty,
+        }
+    }
+}
+
+impl<'a, Message, Theme, Renderer> Widget<Message, Theme, Renderer>
+    for Toaster<'a, Message, Theme, Renderer>
+where
+    Renderer: iced_core::Renderer,
+{
+    fn size(&self) -> Size<Length> {
+        self.content.as_widget().size()
+    }
+
+    fn layout(
+        &self,
+        tree: &mut Tree,
+        renderer: &Renderer,
+        limits: &layout::Limits,
+    ) -> layout::Node {
+        self.content
+            .as_widget()
+            .layout(&mut tree.children[0], renderer, limits)
+    }
+
+    fn draw(
+        &self,
+        tree: &Tree,
+        renderer: &mut Renderer,
+        theme: &Theme,
+        style: &renderer::Style,
+        layout: Layout<'_>,
+        cursor: mouse::Cursor,
+        viewport: &Rectangle,
+    ) {
+        self.content.as_widget().draw(
+            &tree.children[0],
+            renderer,
+            theme,
+            style,
+            layout,
+            cursor,
+            viewport,
+        );
+    }
+
+    fn children(&self) -> Vec<Tree> {
+        vec![Tree::new(&self.content), Tree::new(&self.toasts)]
+    }
+
+    fn diff(&mut self, tree: &mut Tree) {
+        tree.diff_children(&mut [&mut self.content, &mut self.toasts]);
+    }
+
+    fn operate<'b>(
+        &'b self,
+        state: &'b mut Tree,
+        layout: Layout<'_>,
+        renderer: &Renderer,
+        operation: &mut dyn Operation<OperationOutputWrapper<Message>>,
+    ) {
+        self.content
+            .as_widget()
+            .operate(&mut state.children[0], layout, renderer, operation);
+    }
+
+    fn on_event(
+        &mut self,
+        state: &mut Tree,
+        event: Event,
+        layout: Layout<'_>,
+        cursor: mouse::Cursor,
+        renderer: &Renderer,
+        clipboard: &mut dyn Clipboard,
+        shell: &mut Shell<'_, Message>,
+        viewport: &Rectangle,
+    ) -> event::Status {
+        self.content.as_widget_mut().on_event(
+            &mut state.children[0],
+            event,
+            layout,
+            cursor,
+            renderer,
+            clipboard,
+            shell,
+            viewport,
+        )
+    }
+
+    fn mouse_interaction(
+        &self,
+        state: &Tree,
+        layout: Layout<'_>,
+        cursor: mouse::Cursor,
+        viewport: &Rectangle,
+        renderer: &Renderer,
+    ) -> mouse::Interaction {
+        self.content.as_widget().mouse_interaction(
+            &state.children[0],
+            layout,
+            cursor,
+            viewport,
+            renderer,
+        )
+    }
+
+    fn overlay<'b>(
+        &'b mut self,
+        state: &'b mut Tree,
+        layout: Layout<'_>,
+        _renderer: &Renderer,
+    ) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
+        if self.is_empty {
+            None
+        } else {
+            let bounds = layout.bounds();
+
+            Some(overlay::Element::new(
+                bounds.position(),
+                Box::new(ToasterOverlay::new(
+                    &mut state.children[1],
+                    &mut self.toasts,
+                )),
+            ))
+        }
+    }
+}
+
+struct ToasterOverlay<'a, 'b, Message, Theme = iced::Theme, Renderer = iced::Renderer> {
+    state: &'b mut Tree,
+    element: &'b mut Element<'a, Message, Theme, Renderer>,
+}
+
+impl<'a, 'b, Message, Theme, Renderer> ToasterOverlay<'a, 'b, Message, Theme, Renderer>
+where
+    Renderer: renderer::Renderer,
+{
+    fn new(state: &'b mut Tree, element: &'b mut Element<'a, Message, Theme, Renderer>) -> Self {
+        Self { state, element }
+    }
+}
+
+impl<'a, 'b, Message, Theme, Renderer> Overlay<Message, Theme, Renderer>
+    for ToasterOverlay<'a, 'b, Message, Theme, Renderer>
+where
+    Renderer: renderer::Renderer,
+{
+    fn layout(
+        &mut self,
+        renderer: &Renderer,
+        bounds: Size,
+        position: Point,
+        _translation: Vector,
+    ) -> Node {
+        let limits = Limits::new(Size::ZERO, bounds);
+
+        let mut node = self
+            .element
+            .as_widget()
+            .layout(self.state, renderer, &limits);
+
+        let offset = 15.;
+
+        let position = Point::new(
+            (bounds.width / 2.) - (node.size().width / 2.),
+            bounds.height - (node.size().height + offset),
+        );
+
+        node.move_to_mut(position);
+
+        node
+    }
+
+    fn draw(
+        &self,
+        renderer: &mut Renderer,
+        theme: &Theme,
+        style: &renderer::Style,
+        layout: Layout<'_>,
+        cursor: mouse::Cursor,
+    ) {
+        let bounds = layout.bounds();
+        self.element
+            .as_widget()
+            .draw(self.state, renderer, theme, style, layout, cursor, &bounds);
+    }
+
+    fn on_event(
+        &mut self,
+        event: Event,
+        layout: Layout<'_>,
+        cursor: mouse::Cursor,
+        renderer: &Renderer,
+        clipboard: &mut dyn Clipboard,
+        shell: &mut Shell<Message>,
+    ) -> event::Status {
+        self.element.as_widget_mut().on_event(
+            self.state,
+            event,
+            layout,
+            cursor,
+            renderer,
+            clipboard,
+            shell,
+            &layout.bounds(),
+        )
+    }
+
+    fn mouse_interaction(
+        &self,
+        layout: Layout<'_>,
+        cursor: mouse::Cursor,
+        viewport: &Rectangle,
+        renderer: &Renderer,
+    ) -> mouse::Interaction {
+        self.element
+            .as_widget()
+            .mouse_interaction(self.state, layout, cursor, viewport, renderer)
+    }
+
+    fn overlay<'c>(
+        &'c mut self,
+        layout: Layout<'_>,
+        renderer: &Renderer,
+    ) -> Option<overlay::Element<'c, Message, Theme, Renderer>> {
+        self.element
+            .as_widget_mut()
+            .overlay(self.state, layout, renderer)
+    }
+}
+
+impl<'a, Message, Theme, Renderer> From<Toaster<'a, Message, Theme, Renderer>>
+    for Element<'a, Message, Theme, Renderer>
+where
+    Renderer: renderer::Renderer + 'a,
+    Theme: 'a,
+    Message: 'a,
+{
+    fn from(
+        toaster: Toaster<'a, Message, Theme, Renderer>,
+    ) -> Element<'a, Message, Theme, Renderer> {
+        Element::new(toaster)
+    }
+}