Merge pull request #1284 from iced-rs/virtual-widgets

Stateless widgets

29 files changed, 464 insertions, 280 deletions

diff --git a/graphics/Cargo.toml b/graphics/Cargo.toml
index 8ccc7849..a84acbd6 100644
--- a/graphics/Cargo.toml
+++ b/graphics/Cargo.toml
@@ -17,6 +17,7 @@ font-source = ["font-kit"]
 font-fallback = []
 font-icons = []
 opengl = []
+pure = ["iced_pure"]
 
 [dependencies]
 glam = "0.10"
@@ -35,6 +36,11 @@ path = "../native"
 version = "0.3"
 path = "../style"
 
+[dependencies.iced_pure]
+version = "0.1"
+path = "../pure"
+optional = true
+
 [dependencies.lyon]
 version = "0.17"
 optional = true
diff --git a/graphics/src/layer.rs b/graphics/src/layer.rs
index 7a32c850..93506258 100644
--- a/graphics/src/layer.rs
+++ b/graphics/src/layer.rs
@@ -1,12 +1,13 @@
 //! Organize rendering primitives into a flattened list of layers.
 use crate::alignment;
-use crate::image;
-use crate::svg;
 use crate::triangle;
 use crate::{
     Background, Font, Point, Primitive, Rectangle, Size, Vector, Viewport,
 };
 
+use iced_native::image;
+use iced_native::svg;
+
 /// A group of primitives that should be clipped together.
 #[derive(Debug, Clone)]
 pub struct Layer<'a> {
diff --git a/graphics/src/renderer.rs b/graphics/src/renderer.rs
index c32eb471..cb31ea5f 100644
--- a/graphics/src/renderer.rs
+++ b/graphics/src/renderer.rs
@@ -1,8 +1,10 @@
 //! Create a renderer from a [`Backend`].
 use crate::backend::{self, Backend};
 use crate::{Primitive, Vector};
+use iced_native::image;
 use iced_native::layout;
 use iced_native::renderer;
+use iced_native::svg;
 use iced_native::text::{self, Text};
 use iced_native::{Background, Element, Font, Point, Rectangle, Size};
 
@@ -168,3 +170,31 @@ where
         });
     }
 }
+
+impl<B> image::Renderer for Renderer<B>
+where
+    B: Backend + backend::Image,
+{
+    type Handle = image::Handle;
+
+    fn dimensions(&self, handle: &image::Handle) -> (u32, u32) {
+        self.backend().dimensions(handle)
+    }
+
+    fn draw(&mut self, handle: image::Handle, bounds: Rectangle) {
+        self.draw_primitive(Primitive::Image { handle, bounds })
+    }
+}
+
+impl<B> svg::Renderer for Renderer<B>
+where
+    B: Backend + backend::Svg,
+{
+    fn dimensions(&self, handle: &svg::Handle) -> (u32, u32) {
+        self.backend().viewport_dimensions(handle)
+    }
+
+    fn draw(&mut self, handle: svg::Handle, bounds: Rectangle) {
+        self.draw_primitive(Primitive::Svg { handle, bounds })
+    }
+}
diff --git a/graphics/src/widget.rs b/graphics/src/widget.rs
index e34d267f..cf500a69 100644
--- a/graphics/src/widget.rs
+++ b/graphics/src/widget.rs
@@ -1,67 +1,4 @@
-//! Use the widgets supported out-of-the-box.
-//!
-//! # Re-exports
-//! For convenience, the contents of this module are available at the root
-//! module. Therefore, you can directly type:
-//!
-//! ```
-//! use iced_graphics::{button, Button};
-//! ```
-pub mod button;
-pub mod checkbox;
-pub mod container;
-pub mod image;
-pub mod pane_grid;
-pub mod pick_list;
-pub mod progress_bar;
-pub mod radio;
-pub mod rule;
-pub mod scrollable;
-pub mod slider;
-pub mod svg;
-pub mod text_input;
-pub mod toggler;
-pub mod tooltip;
-
-mod column;
-mod row;
-mod space;
-mod text;
-
-#[doc(no_inline)]
-pub use button::Button;
-#[doc(no_inline)]
-pub use checkbox::Checkbox;
-#[doc(no_inline)]
-pub use container::Container;
-#[doc(no_inline)]
-pub use pane_grid::PaneGrid;
-#[doc(no_inline)]
-pub use pick_list::PickList;
-#[doc(no_inline)]
-pub use progress_bar::ProgressBar;
-#[doc(no_inline)]
-pub use radio::Radio;
-#[doc(no_inline)]
-pub use rule::Rule;
-#[doc(no_inline)]
-pub use scrollable::Scrollable;
-#[doc(no_inline)]
-pub use slider::Slider;
-#[doc(no_inline)]
-pub use text_input::TextInput;
-#[doc(no_inline)]
-pub use toggler::Toggler;
-#[doc(no_inline)]
-pub use tooltip::Tooltip;
-
-pub use column::Column;
-pub use image::Image;
-pub use row::Row;
-pub use space::Space;
-pub use svg::Svg;
-pub use text::Text;
-
+//! Use the graphical widgets supported out-of-the-box.
 #[cfg(feature = "canvas")]
 #[cfg_attr(docsrs, doc(cfg(feature = "canvas")))]
 pub mod canvas;
@@ -77,3 +14,6 @@ pub mod qr_code;
 #[cfg(feature = "qr_code")]
 #[doc(no_inline)]
 pub use qr_code::QRCode;
+
+#[cfg(feature = "pure")]
+pub mod pure;
diff --git a/graphics/src/widget/button.rs b/graphics/src/widget/button.rs
deleted file mode 100644
index 7b40c47b..00000000
--- a/graphics/src/widget/button.rs
+++ /dev/null
@@ -1,12 +0,0 @@
-//! Allow your users to perform actions by pressing a button.
-//!
-//! A [`Button`] has some local [`State`].
-use crate::Renderer;
-
-pub use iced_native::widget::button::{State, Style, StyleSheet};
-
-/// A widget that produces a message when clicked.
-///
-/// This is an alias of an `iced_native` button with an `iced_wgpu::Renderer`.
-pub type Button<'a, Message, Backend> =
-    iced_native::widget::Button<'a, Message, Renderer<Backend>>;
diff --git a/graphics/src/widget/canvas.rs b/graphics/src/widget/canvas.rs
index 65d7e37e..6c526e35 100644
--- a/graphics/src/widget/canvas.rs
+++ b/graphics/src/widget/canvas.rs
@@ -6,14 +6,6 @@
 use crate::renderer::{self, Renderer};
 use crate::{Backend, Primitive};
 
-use iced_native::layout;
-use iced_native::mouse;
-use iced_native::{
-    Clipboard, Element, Layout, Length, Point, Rectangle, Shell, Size, Vector,
-    Widget,
-};
-use std::marker::PhantomData;
-
 pub mod event;
 pub mod path;
 
@@ -37,6 +29,15 @@ pub use program::Program;
 pub use stroke::{LineCap, LineDash, LineJoin, Stroke};
 pub use text::Text;
 
+use iced_native::layout;
+use iced_native::mouse;
+use iced_native::{
+    Clipboard, Element, Layout, Length, Point, Rectangle, Shell, Size, Vector,
+    Widget,
+};
+
+use std::marker::PhantomData;
+
 /// A widget capable of drawing 2D graphics.
 ///
 /// # Examples
@@ -97,7 +98,7 @@ pub struct Canvas<Message, P: Program<Message>> {
     width: Length,
     height: Length,
     program: P,
-    phantom: PhantomData<Message>,
+    message_: PhantomData<Message>,
 }
 
 impl<Message, P: Program<Message>> Canvas<Message, P> {
@@ -109,7 +110,7 @@ impl<Message, P: Program<Message>> Canvas<Message, P> {
             width: Length::Units(Self::DEFAULT_SIZE),
             height: Length::Units(Self::DEFAULT_SIZE),
             program,
-            phantom: PhantomData,
+            message_: PhantomData,
         }
     }
 
diff --git a/graphics/src/widget/checkbox.rs b/graphics/src/widget/checkbox.rs
deleted file mode 100644
index 0d2e93f9..00000000
--- a/graphics/src/widget/checkbox.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-//! Show toggle controls using checkboxes.
-use crate::Renderer;
-
-pub use iced_style::checkbox::{Style, StyleSheet};
-
-/// A box that can be checked.
-///
-/// This is an alias of an `iced_native` checkbox with an `iced_wgpu::Renderer`.
-pub type Checkbox<'a, Message, Backend> =
-    iced_native::widget::Checkbox<'a, Message, Renderer<Backend>>;
diff --git a/graphics/src/widget/column.rs b/graphics/src/widget/column.rs
deleted file mode 100644
index 561681d5..00000000
--- a/graphics/src/widget/column.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-use crate::Renderer;
-
-/// A container that distributes its contents vertically.
-pub type Column<'a, Message, Backend> =
-    iced_native::widget::Column<'a, Message, Renderer<Backend>>;
diff --git a/graphics/src/widget/container.rs b/graphics/src/widget/container.rs
deleted file mode 100644
index 99996f3b..00000000
--- a/graphics/src/widget/container.rs
+++ /dev/null
@@ -1,11 +0,0 @@
-//! Decorate content and apply alignment.
-use crate::Renderer;
-
-pub use iced_style::container::{Style, StyleSheet};
-
-/// An element decorating some content.
-///
-/// This is an alias of an `iced_native` container with a default
-/// `Renderer`.
-pub type Container<'a, Message, Backend> =
-    iced_native::widget::Container<'a, Message, Renderer<Backend>>;
diff --git a/graphics/src/widget/image.rs b/graphics/src/widget/image.rs
deleted file mode 100644
index 76152484..00000000
--- a/graphics/src/widget/image.rs
+++ /dev/null
@@ -1,25 +0,0 @@
-//! Display images in your user interface.
-pub mod viewer;
-
-use crate::backend::{self, Backend};
-use crate::{Primitive, Rectangle, Renderer};
-
-use iced_native::image;
-
-pub use iced_native::widget::image::{Image, Viewer};
-pub use image::Handle;
-
-impl<B> image::Renderer for Renderer<B>
-where
-    B: Backend + backend::Image,
-{
-    type Handle = image::Handle;
-
-    fn dimensions(&self, handle: &image::Handle) -> (u32, u32) {
-        self.backend().dimensions(handle)
-    }
-
-    fn draw(&mut self, handle: image::Handle, bounds: Rectangle) {
-        self.draw_primitive(Primitive::Image { handle, bounds })
-    }
-}
diff --git a/graphics/src/widget/image/viewer.rs b/graphics/src/widget/image/viewer.rs
deleted file mode 100644
index 9260990a..00000000
--- a/graphics/src/widget/image/viewer.rs
+++ /dev/null
@@ -1,2 +0,0 @@
-//! Zoom and pan on an image.
-pub use iced_native::widget::image::Viewer;
diff --git a/graphics/src/widget/pane_grid.rs b/graphics/src/widget/pane_grid.rs
deleted file mode 100644
index 95189920..00000000
--- a/graphics/src/widget/pane_grid.rs
+++ /dev/null
@@ -1,26 +0,0 @@
-//! Let your users split regions of your application and organize layout dynamically.
-//!
-//! [![Pane grid - Iced](https://thumbs.gfycat.com/MixedFlatJellyfish-small.gif)](https://gfycat.com/mixedflatjellyfish)
-//!
-//! # Example
-//! The [`pane_grid` example] showcases how to use a [`PaneGrid`] with resizing,
-//! drag and drop, and hotkey support.
-//!
-//! [`pane_grid` example]: https://github.com/hecrj/iced/tree/0.3/examples/pane_grid
-use crate::Renderer;
-
-pub use iced_native::widget::pane_grid::{
-    Axis, Configuration, Content, Direction, DragEvent, Node, Pane,
-    ResizeEvent, Split, State, TitleBar,
-};
-
-pub use iced_style::pane_grid::{Line, StyleSheet};
-
-/// A collection of panes distributed using either vertical or horizontal splits
-/// to completely fill the space available.
-///
-/// [![Pane grid - Iced](https://thumbs.gfycat.com/MixedFlatJellyfish-small.gif)](https://gfycat.com/mixedflatjellyfish)
-///
-/// This is an alias of an `iced_native` pane grid with an `iced_wgpu::Renderer`.
-pub type PaneGrid<'a, Message, Backend> =
-    iced_native::widget::PaneGrid<'a, Message, Renderer<Backend>>;
diff --git a/graphics/src/widget/pick_list.rs b/graphics/src/widget/pick_list.rs
deleted file mode 100644
index f3ac12b8..00000000
--- a/graphics/src/widget/pick_list.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-//! Display a dropdown list of selectable values.
-use crate::Renderer;
-
-pub use iced_native::widget::pick_list::State;
-pub use iced_style::pick_list::{Style, StyleSheet};
-
-/// A widget allowing the selection of a single value from a list of options.
-pub type PickList<'a, T, Message, Backend> =
-    iced_native::widget::PickList<'a, T, Message, Renderer<Backend>>;
diff --git a/graphics/src/widget/progress_bar.rs b/graphics/src/widget/progress_bar.rs
deleted file mode 100644
index 3666ecfd..00000000
--- a/graphics/src/widget/progress_bar.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-//! Allow your users to visually track the progress of a computation.
-//!
-//! A [`ProgressBar`] has a range of possible values and a current value,
-//! as well as a length, height and style.
-pub use iced_native::widget::progress_bar::*;
diff --git a/graphics/src/widget/pure.rs b/graphics/src/widget/pure.rs
new file mode 100644
index 00000000..ee530379
--- /dev/null
+++ b/graphics/src/widget/pure.rs
@@ -0,0 +1,12 @@
+//! Leverage pure, virtual widgets in your application.
+#[cfg(feature = "canvas")]
+pub mod canvas;
+
+#[cfg(feature = "canvas")]
+pub use canvas::Canvas;
+
+#[cfg(feature = "qr_code")]
+pub mod qr_code;
+
+#[cfg(feature = "qr_code")]
+pub use qr_code::QRCode;
diff --git a/graphics/src/widget/pure/canvas.rs b/graphics/src/widget/pure/canvas.rs
new file mode 100644
index 00000000..2e3e7ede
--- /dev/null
+++ b/graphics/src/widget/pure/canvas.rs
@@ -0,0 +1,237 @@
+//! Draw 2D graphics for your users.
+//!
+//! A [`Canvas`] widget can be used to draw different kinds of 2D shapes in a
+//! [`Frame`]. It can be used for animation, data visualization, game graphics,
+//! and more!
+mod program;
+
+pub use crate::widget::canvas::{Canvas as _, Program as _, *};
+
+pub use program::Program;
+
+use crate::{Backend, Primitive, Renderer};
+
+use iced_native::layout::{self, Layout};
+use iced_native::mouse;
+use iced_native::renderer;
+use iced_native::{Clipboard, Length, Point, Rectangle, Shell, Size, Vector};
+use iced_pure::widget::tree::{self, Tree};
+use iced_pure::{Element, Widget};
+
+use std::marker::PhantomData;
+
+/// A widget capable of drawing 2D graphics.
+///
+/// ## Drawing a simple circle
+/// If you want to get a quick overview, here's how we can draw a simple circle:
+///
+/// ```no_run
+/// # mod iced {
+/// #     pub mod pure {
+/// #         pub use iced_graphics::pure::canvas;
+/// #     }
+/// #     pub use iced_native::{Color, Rectangle};
+/// # }
+/// use iced::pure::canvas::{self, Canvas, Cursor, Fill, Frame, Geometry, Path, Program};
+/// use iced::{Color, Rectangle};
+///
+/// // First, we define the data we need for drawing
+/// #[derive(Debug)]
+/// struct Circle {
+///     radius: f32,
+/// }
+///
+/// // Then, we implement the `Program` trait
+/// impl Program<()> for Circle {
+///     type State = ();
+///
+///     fn draw(&self, _state: &(), bounds: Rectangle, _cursor: Cursor) -> Vec<Geometry>{
+///         // We prepare a new `Frame`
+///         let mut frame = Frame::new(bounds.size());
+///
+///         // We create a `Path` representing a simple circle
+///         let circle = Path::circle(frame.center(), self.radius);
+///
+///         // And fill it with some color
+///         frame.fill(&circle, Color::BLACK);
+///
+///         // Finally, we produce the geometry
+///         vec![frame.into_geometry()]
+///     }
+/// }
+///
+/// // Finally, we simply use our `Circle` to create the `Canvas`!
+/// let canvas = Canvas::new(Circle { radius: 50.0 });
+/// ```
+#[derive(Debug)]
+pub struct Canvas<Message, P>
+where
+    P: Program<Message>,
+{
+    width: Length,
+    height: Length,
+    program: P,
+    message_: PhantomData<Message>,
+}
+
+impl<Message, P> Canvas<Message, P>
+where
+    P: Program<Message>,
+{
+    const DEFAULT_SIZE: u16 = 100;
+
+    /// Creates a new [`Canvas`].
+    pub fn new(program: P) -> Self {
+        Canvas {
+            width: Length::Units(Self::DEFAULT_SIZE),
+            height: Length::Units(Self::DEFAULT_SIZE),
+            program,
+            message_: PhantomData,
+        }
+    }
+
+    /// Sets the width of the [`Canvas`].
+    pub fn width(mut self, width: Length) -> Self {
+        self.width = width;
+        self
+    }
+
+    /// Sets the height of the [`Canvas`].
+    pub fn height(mut self, height: Length) -> Self {
+        self.height = height;
+        self
+    }
+}
+
+impl<Message, P, B> Widget<Message, Renderer<B>> for Canvas<Message, P>
+where
+    P: Program<Message>,
+    B: Backend,
+{
+    fn tag(&self) -> tree::Tag {
+        tree::Tag::of::<P::State>()
+    }
+
+    fn state(&self) -> tree::State {
+        tree::State::new(P::State::default())
+    }
+
+    fn width(&self) -> Length {
+        self.width
+    }
+
+    fn height(&self) -> Length {
+        self.height
+    }
+
+    fn layout(
+        &self,
+        _renderer: &Renderer<B>,
+        limits: &layout::Limits,
+    ) -> layout::Node {
+        let limits = limits.width(self.width).height(self.height);
+        let size = limits.resolve(Size::ZERO);
+
+        layout::Node::new(size)
+    }
+
+    fn on_event(
+        &mut self,
+        tree: &mut Tree,
+        event: iced_native::Event,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        _renderer: &Renderer<B>,
+        _clipboard: &mut dyn Clipboard,
+        shell: &mut Shell<'_, Message>,
+    ) -> event::Status {
+        let bounds = layout.bounds();
+
+        let canvas_event = match event {
+            iced_native::Event::Mouse(mouse_event) => {
+                Some(Event::Mouse(mouse_event))
+            }
+            iced_native::Event::Keyboard(keyboard_event) => {
+                Some(Event::Keyboard(keyboard_event))
+            }
+            _ => None,
+        };
+
+        let cursor = Cursor::from_window_position(cursor_position);
+
+        if let Some(canvas_event) = canvas_event {
+            let state = tree.state.downcast_mut::<P::State>();
+
+            let (event_status, message) =
+                self.program.update(state, canvas_event, bounds, cursor);
+
+            if let Some(message) = message {
+                shell.publish(message);
+            }
+
+            return event_status;
+        }
+
+        event::Status::Ignored
+    }
+
+    fn mouse_interaction(
+        &self,
+        tree: &Tree,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        _viewport: &Rectangle,
+        _renderer: &Renderer<B>,
+    ) -> mouse::Interaction {
+        let bounds = layout.bounds();
+        let cursor = Cursor::from_window_position(cursor_position);
+        let state = tree.state.downcast_ref::<P::State>();
+
+        self.program.mouse_interaction(state, bounds, cursor)
+    }
+
+    fn draw(
+        &self,
+        tree: &Tree,
+        renderer: &mut Renderer<B>,
+        _style: &renderer::Style,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        _viewport: &Rectangle,
+    ) {
+        use iced_native::Renderer as _;
+
+        let bounds = layout.bounds();
+
+        if bounds.width < 1.0 || bounds.height < 1.0 {
+            return;
+        }
+
+        let translation = Vector::new(bounds.x, bounds.y);
+        let cursor = Cursor::from_window_position(cursor_position);
+        let state = tree.state.downcast_ref::<P::State>();
+
+        renderer.with_translation(translation, |renderer| {
+            renderer.draw_primitive(Primitive::Group {
+                primitives: self
+                    .program
+                    .draw(state, bounds, cursor)
+                    .into_iter()
+                    .map(Geometry::into_primitive)
+                    .collect(),
+            });
+        });
+    }
+}
+
+impl<'a, Message, P, B> From<Canvas<Message, P>>
+    for Element<'a, Message, Renderer<B>>
+where
+    Message: 'a,
+    P: Program<Message> + 'a,
+    B: Backend,
+{
+    fn from(canvas: Canvas<Message, P>) -> Element<'a, Message, Renderer<B>> {
+        Element::new(canvas)
+    }
+}
diff --git a/graphics/src/widget/pure/canvas/program.rs b/graphics/src/widget/pure/canvas/program.rs
new file mode 100644
index 00000000..ee74c27f
--- /dev/null
+++ b/graphics/src/widget/pure/canvas/program.rs
@@ -0,0 +1,100 @@
+use crate::widget::pure::canvas::event::{self, Event};
+use crate::widget::pure::canvas::mouse;
+use crate::widget::pure::canvas::{Cursor, Geometry};
+use crate::Rectangle;
+
+/// The state and logic of a [`Canvas`].
+///
+/// A [`Program`] can mutate internal state and produce messages for an
+/// application.
+///
+/// [`Canvas`]: crate::widget::Canvas
+pub trait Program<Message> {
+    /// The internal [`State`] mutated by the [`Program`].
+    type State: Default + 'static;
+
+    /// Updates the state of the [`Program`].
+    ///
+    /// When a [`Program`] is used in a [`Canvas`], the runtime will call this
+    /// method for each [`Event`].
+    ///
+    /// This method can optionally return a `Message` to notify an application
+    /// of any meaningful interactions.
+    ///
+    /// By default, this method does and returns nothing.
+    ///
+    /// [`Canvas`]: crate::widget::Canvas
+    fn update(
+        &self,
+        _state: &mut Self::State,
+        _event: Event,
+        _bounds: Rectangle,
+        _cursor: Cursor,
+    ) -> (event::Status, Option<Message>) {
+        (event::Status::Ignored, None)
+    }
+
+    /// Draws the state of the [`Program`], producing a bunch of [`Geometry`].
+    ///
+    /// [`Geometry`] can be easily generated with a [`Frame`] or stored in a
+    /// [`Cache`].
+    ///
+    /// [`Frame`]: crate::widget::canvas::Frame
+    /// [`Cache`]: crate::widget::canvas::Cache
+    fn draw(
+        &self,
+        state: &Self::State,
+        bounds: Rectangle,
+        cursor: Cursor,
+    ) -> Vec<Geometry>;
+
+    /// Returns the current mouse interaction of the [`Program`].
+    ///
+    /// The interaction returned will be in effect even if the cursor position
+    /// is out of bounds of the program's [`Canvas`].
+    ///
+    /// [`Canvas`]: crate::widget::Canvas
+    fn mouse_interaction(
+        &self,
+        _state: &Self::State,
+        _bounds: Rectangle,
+        _cursor: Cursor,
+    ) -> mouse::Interaction {
+        mouse::Interaction::default()
+    }
+}
+
+impl<Message, T> Program<Message> for &T
+where
+    T: Program<Message>,
+{
+    type State = T::State;
+
+    fn update(
+        &self,
+        state: &mut Self::State,
+        event: Event,
+        bounds: Rectangle,
+        cursor: Cursor,
+    ) -> (event::Status, Option<Message>) {
+        T::update(self, state, event, bounds, cursor)
+    }
+
+    fn draw(
+        &self,
+        state: &Self::State,
+        bounds: Rectangle,
+        cursor: Cursor,
+    ) -> Vec<Geometry> {
+        T::draw(self, state, bounds, cursor)
+    }
+
+    fn mouse_interaction(
+        &self,
+        state: &Self::State,
+        bounds: Rectangle,
+        cursor: Cursor,
+    ) -> mouse::Interaction {
+        T::mouse_interaction(self, state, bounds, cursor)
+    }
+}
diff --git a/graphics/src/widget/pure/qr_code.rs b/graphics/src/widget/pure/qr_code.rs
new file mode 100644
index 00000000..9d517374
--- /dev/null
+++ b/graphics/src/widget/pure/qr_code.rs
@@ -0,0 +1,61 @@
+//! Encode and display information in a QR code.
+pub use crate::qr_code::*;
+
+use crate::{Backend, Renderer};
+
+use iced_native::layout::{self, Layout};
+use iced_native::renderer;
+use iced_native::{Length, Point, Rectangle};
+use iced_pure::widget::tree::Tree;
+use iced_pure::{Element, Widget};
+
+impl<'a, Message, B> Widget<Message, Renderer<B>> for QRCode<'a>
+where
+    B: Backend,
+{
+    fn width(&self) -> Length {
+        <Self as iced_native::Widget<Message, Renderer<B>>>::width(self)
+    }
+
+    fn height(&self) -> Length {
+        <Self as iced_native::Widget<Message, Renderer<B>>>::height(self)
+    }
+
+    fn layout(
+        &self,
+        renderer: &Renderer<B>,
+        limits: &layout::Limits,
+    ) -> layout::Node {
+        <Self as iced_native::Widget<Message, Renderer<B>>>::layout(
+            self, renderer, limits,
+        )
+    }
+
+    fn draw(
+        &self,
+        _tree: &Tree,
+        renderer: &mut Renderer<B>,
+        style: &renderer::Style,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        viewport: &Rectangle,
+    ) {
+        <Self as iced_native::Widget<Message, Renderer<B>>>::draw(
+            self,
+            renderer,
+            style,
+            layout,
+            cursor_position,
+            viewport,
+        )
+    }
+}
+
+impl<'a, Message, B> Into<Element<'a, Message, Renderer<B>>> for QRCode<'a>
+where
+    B: Backend,
+{
+    fn into(self) -> Element<'a, Message, Renderer<B>> {
+        Element::new(self)
+    }
+}
diff --git a/graphics/src/widget/radio.rs b/graphics/src/widget/radio.rs
deleted file mode 100644
index 20d72747..00000000
--- a/graphics/src/widget/radio.rs
+++ /dev/null
@@ -1,11 +0,0 @@
-//! Create choices using radio buttons.
-use crate::Renderer;
-
-pub use iced_style::radio::{Style, StyleSheet};
-
-/// A circular button representing a choice.
-///
-/// This is an alias of an `iced_native` radio button with an
-/// `iced_wgpu::Renderer`.
-pub type Radio<'a, Message, Backend> =
-    iced_native::widget::Radio<'a, Message, Renderer<Backend>>;
diff --git a/graphics/src/widget/row.rs b/graphics/src/widget/row.rs
deleted file mode 100644
index 5bee3fd5..00000000
--- a/graphics/src/widget/row.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-use crate::Renderer;
-
-/// A container that distributes its contents horizontally.
-pub type Row<'a, Message, Backend> =
-    iced_native::widget::Row<'a, Message, Renderer<Backend>>;
diff --git a/graphics/src/widget/rule.rs b/graphics/src/widget/rule.rs
deleted file mode 100644
index b96924fa..00000000
--- a/graphics/src/widget/rule.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-//! Display a horizontal or vertical rule for dividing content.
-
-pub use iced_native::widget::rule::*;
diff --git a/graphics/src/widget/scrollable.rs b/graphics/src/widget/scrollable.rs
deleted file mode 100644
index 3fdaf668..00000000
--- a/graphics/src/widget/scrollable.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-//! Navigate an endless amount of content with a scrollbar.
-use crate::Renderer;
-
-pub use iced_native::widget::scrollable::State;
-pub use iced_style::scrollable::{Scrollbar, Scroller, StyleSheet};
-
-/// A widget that can vertically display an infinite amount of content
-/// with a scrollbar.
-///
-/// This is an alias of an `iced_native` scrollable with a default
-/// `Renderer`.
-pub type Scrollable<'a, Message, Backend> =
-    iced_native::widget::Scrollable<'a, Message, Renderer<Backend>>;
diff --git a/graphics/src/widget/slider.rs b/graphics/src/widget/slider.rs
deleted file mode 100644
index 96dc6ec4..00000000
--- a/graphics/src/widget/slider.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-//! Display an interactive selector of a single value from a range of values.
-//!
-//! A [`Slider`] has some local [`State`].
-pub use iced_native::widget::slider::{Slider, State};
-pub use iced_style::slider::{Handle, HandleShape, Style, StyleSheet};
diff --git a/graphics/src/widget/space.rs b/graphics/src/widget/space.rs
deleted file mode 100644
index 77e93dbb..00000000
--- a/graphics/src/widget/space.rs
+++ /dev/null
@@ -1 +0,0 @@
-pub use iced_native::widget::Space;
diff --git a/graphics/src/widget/svg.rs b/graphics/src/widget/svg.rs
deleted file mode 100644
index 5817a552..00000000
--- a/graphics/src/widget/svg.rs
+++ /dev/null
@@ -1,20 +0,0 @@
-//! Display vector graphics in your application.
-use crate::backend::{self, Backend};
-use crate::{Primitive, Rectangle, Renderer};
-use iced_native::svg;
-
-pub use iced_native::widget::svg::Svg;
-pub use svg::Handle;
-
-impl<B> svg::Renderer for Renderer<B>
-where
-    B: Backend + backend::Svg,
-{
-    fn dimensions(&self, handle: &svg::Handle) -> (u32, u32) {
-        self.backend().viewport_dimensions(handle)
-    }
-
-    fn draw(&mut self, handle: svg::Handle, bounds: Rectangle) {
-        self.draw_primitive(Primitive::Svg { handle, bounds })
-    }
-}
diff --git a/graphics/src/widget/text.rs b/graphics/src/widget/text.rs
deleted file mode 100644
index 43516fca..00000000
--- a/graphics/src/widget/text.rs
+++ /dev/null
@@ -1,7 +0,0 @@
-//! Write some text for your users to read.
-use crate::Renderer;
-
-/// A paragraph of text.
-///
-/// This is an alias of an `iced_native` text with an `iced_wgpu::Renderer`.
-pub type Text<Backend> = iced_native::widget::Text<Renderer<Backend>>;
diff --git a/graphics/src/widget/text_input.rs b/graphics/src/widget/text_input.rs
deleted file mode 100644
index 87384d7e..00000000
--- a/graphics/src/widget/text_input.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-//! Display fields that can be filled with text.
-//!
-//! A [`TextInput`] has some local [`State`].
-use crate::Renderer;
-
-pub use iced_native::widget::text_input::State;
-pub use iced_style::text_input::{Style, StyleSheet};
-
-/// A field that can be filled with text.
-///
-/// This is an alias of an `iced_native` text input with an `iced_wgpu::Renderer`.
-pub type TextInput<'a, Message, Backend> =
-    iced_native::widget::TextInput<'a, Message, Renderer<Backend>>;
diff --git a/graphics/src/widget/toggler.rs b/graphics/src/widget/toggler.rs
deleted file mode 100644
index 9053e6ed..00000000
--- a/graphics/src/widget/toggler.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-//! Show toggle controls using togglers.
-use crate::Renderer;
-
-pub use iced_style::toggler::{Style, StyleSheet};
-
-/// A toggler that can be toggled.
-///
-/// This is an alias of an `iced_native` toggler with an `iced_wgpu::Renderer`.
-pub type Toggler<'a, Message, Backend> =
-    iced_native::widget::Toggler<'a, Message, Renderer<Backend>>;
diff --git a/graphics/src/widget/tooltip.rs b/graphics/src/widget/tooltip.rs
deleted file mode 100644
index 7dc12ed4..00000000
--- a/graphics/src/widget/tooltip.rs
+++ /dev/null
@@ -1,11 +0,0 @@
-//! Decorate content and apply alignment.
-use crate::Renderer;
-
-/// An element decorating some content.
-///
-/// This is an alias of an `iced_native` tooltip with a default
-/// `Renderer`.
-pub type Tooltip<'a, Message, Backend> =
-    iced_native::widget::Tooltip<'a, Message, Renderer<Backend>>;
-
-pub use iced_native::widget::tooltip::Position;