Merge remote-tracking branch 'origin/master' into feat/multi-window-support

# Conflicts:
#	Cargo.toml
#	core/src/window/icon.rs
#	core/src/window/id.rs
#	core/src/window/position.rs
#	core/src/window/settings.rs
#	examples/integration/src/main.rs
#	examples/integration_opengl/src/main.rs
#	glutin/src/application.rs
#	native/src/subscription.rs
#	native/src/window.rs
#	runtime/src/window/action.rs
#	src/lib.rs
#	src/window.rs
#	winit/Cargo.toml
#	winit/src/application.rs
#	winit/src/icon.rs
#	winit/src/settings.rs
#	winit/src/window.rs

55 files changed, 1389 insertions, 355 deletions

diff --git a/core/Cargo.toml b/core/Cargo.toml
index 0d6310d3..55f2e85f 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "iced_core"
-version = "0.8.1"
+version = "0.9.0"
 authors = ["Héctor Ramón Jiménez <hector0193@gmail.com>"]
 edition = "2021"
 description = "The essential concepts of Iced"
@@ -9,10 +9,16 @@ repository = "https://github.com/iced-rs/iced"
 
 [dependencies]
 bitflags = "1.2"
+thiserror = "1"
+log = "0.4.17"
+twox-hash = { version = "1.5", default-features = false }
 
 [dependencies.palette]
-version = "0.6"
+version = "0.7"
 optional = true
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 instant = "0.1"
+
+[dev-dependencies]
+approx = "0.5"
diff --git a/core/README.md b/core/README.md
index 64d92e78..519e0608 100644
--- a/core/README.md
+++ b/core/README.md
@@ -18,7 +18,7 @@ This crate is meant to be a starting point for an Iced runtime.
 Add `iced_core` as a dependency in your `Cargo.toml`:
 
 ```toml
-iced_core = "0.8"
+iced_core = "0.9"
 ```
 
 __Iced moves fast and the `master` branch can contain breaking changes!__ If
diff --git a/core/src/angle.rs b/core/src/angle.rs
new file mode 100644
index 00000000..75a57c76
--- /dev/null
+++ b/core/src/angle.rs
@@ -0,0 +1,33 @@
+use crate::{Point, Rectangle, Vector};
+use std::f32::consts::PI;
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+/// Degrees
+pub struct Degrees(pub f32);
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+/// Radians
+pub struct Radians(pub f32);
+
+impl From<Degrees> for Radians {
+    fn from(degrees: Degrees) -> Self {
+        Radians(degrees.0 * PI / 180.0)
+    }
+}
+
+impl Radians {
+    /// Calculates the line in which the [`Angle`] intercepts the `bounds`.
+    pub fn to_distance(&self, bounds: &Rectangle) -> (Point, Point) {
+        let v1 = Vector::new(f32::cos(self.0), f32::sin(self.0));
+
+        let distance_to_rect = f32::min(
+            f32::abs((bounds.y - bounds.center().y) / v1.y),
+            f32::abs(((bounds.x + bounds.width) - bounds.center().x) / v1.x),
+        );
+
+        let start = bounds.center() + v1 * distance_to_rect;
+        let end = bounds.center() - v1 * distance_to_rect;
+
+        (start, end)
+    }
+}
diff --git a/core/src/background.rs b/core/src/background.rs
index cfb95867..347c52c0 100644
--- a/core/src/background.rs
+++ b/core/src/background.rs
@@ -1,11 +1,14 @@
+use crate::gradient::{self, Gradient};
 use crate::Color;
 
 /// The background of some element.
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub enum Background {
-    /// A solid color
+    /// A solid color.
     Color(Color),
-    // TODO: Add gradient and image variants
+    /// Linearly interpolate between several colors.
+    Gradient(Gradient),
+    // TODO: Add image variant
 }
 
 impl From<Color> for Background {
@@ -14,8 +17,14 @@ impl From<Color> for Background {
     }
 }
 
-impl From<Color> for Option<Background> {
-    fn from(color: Color) -> Self {
-        Some(Background::from(color))
+impl From<Gradient> for Background {
+    fn from(gradient: Gradient) -> Self {
+        Background::Gradient(gradient)
+    }
+}
+
+impl From<gradient::Linear> for Background {
+    fn from(gradient: gradient::Linear) -> Self {
+        Background::Gradient(Gradient::Linear(gradient))
     }
 }
diff --git a/core/src/border_radius.rs b/core/src/border_radius.rs
new file mode 100644
index 00000000..a444dd74
--- /dev/null
+++ b/core/src/border_radius.rs
@@ -0,0 +1,22 @@
+/// The border radii for the corners of a graphics primitive in the order:
+/// top-left, top-right, bottom-right, bottom-left.
+#[derive(Debug, Clone, Copy, PartialEq, Default)]
+pub struct BorderRadius([f32; 4]);
+
+impl From<f32> for BorderRadius {
+    fn from(w: f32) -> Self {
+        Self([w; 4])
+    }
+}
+
+impl From<[f32; 4]> for BorderRadius {
+    fn from(radi: [f32; 4]) -> Self {
+        Self(radi)
+    }
+}
+
+impl From<BorderRadius> for [f32; 4] {
+    fn from(radi: BorderRadius) -> Self {
+        radi.0
+    }
+}
diff --git a/core/src/clipboard.rs b/core/src/clipboard.rs
new file mode 100644
index 00000000..081b4004
--- /dev/null
+++ b/core/src/clipboard.rs
@@ -0,0 +1,23 @@
+//! Access the clipboard.
+
+/// A buffer for short-term storage and transfer within and between
+/// applications.
+pub trait Clipboard {
+    /// Reads the current content of the [`Clipboard`] as text.
+    fn read(&self) -> Option<String>;
+
+    /// Writes the given text contents to the [`Clipboard`].
+    fn write(&mut self, contents: String);
+}
+
+/// A null implementation of the [`Clipboard`] trait.
+#[derive(Debug, Clone, Copy)]
+pub struct Null;
+
+impl Clipboard for Null {
+    fn read(&self) -> Option<String> {
+        None
+    }
+
+    fn write(&mut self, _contents: String) {}
+}
diff --git a/core/src/color.rs b/core/src/color.rs
index fe0a1856..1392f28b 100644
--- a/core/src/color.rs
+++ b/core/src/color.rs
@@ -183,15 +183,15 @@ macro_rules! color {
 }
 
 #[cfg(feature = "palette")]
-/// Converts from palette's `Srgba` type to a [`Color`].
+/// Converts from palette's `Rgba` type to a [`Color`].
 impl From<Srgba> for Color {
-    fn from(srgba: Srgba) -> Self {
-        Color::new(srgba.red, srgba.green, srgba.blue, srgba.alpha)
+    fn from(rgba: Srgba) -> Self {
+        Color::new(rgba.red, rgba.green, rgba.blue, rgba.alpha)
     }
 }
 
 #[cfg(feature = "palette")]
-/// Converts from [`Color`] to palette's `Srgba` type.
+/// Converts from [`Color`] to palette's `Rgba` type.
 impl From<Color> for Srgba {
     fn from(c: Color) -> Self {
         Srgba::new(c.r, c.g, c.b, c.a)
@@ -199,15 +199,15 @@ impl From<Color> for Srgba {
 }
 
 #[cfg(feature = "palette")]
-/// Converts from palette's `Srgb` type to a [`Color`].
+/// Converts from palette's `Rgb` type to a [`Color`].
 impl From<Srgb> for Color {
-    fn from(srgb: Srgb) -> Self {
-        Color::new(srgb.red, srgb.green, srgb.blue, 1.0)
+    fn from(rgb: Srgb) -> Self {
+        Color::new(rgb.red, rgb.green, rgb.blue, 1.0)
     }
 }
 
 #[cfg(feature = "palette")]
-/// Converts from [`Color`] to palette's `Srgb` type.
+/// Converts from [`Color`] to palette's `Rgb` type.
 impl From<Color> for Srgb {
     fn from(c: Color) -> Self {
         Srgb::new(c.r, c.g, c.b)
@@ -218,12 +218,12 @@ impl From<Color> for Srgb {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use palette::Blend;
+    use palette::blend::Blend;
 
     #[test]
     fn srgba_traits() {
         let c = Color::from_rgb(0.5, 0.4, 0.3);
-        // Round-trip conversion to the palette:Srgba type
+        // Round-trip conversion to the palette::Srgba type
         let s: Srgba = c.into();
         let r: Color = s.into();
         assert_eq!(c, r);
@@ -231,6 +231,8 @@ mod tests {
 
     #[test]
     fn color_manipulation() {
+        use approx::assert_relative_eq;
+
         let c1 = Color::from_rgb(0.5, 0.4, 0.3);
         let c2 = Color::from_rgb(0.2, 0.5, 0.3);
 
@@ -238,19 +240,15 @@ mod tests {
         let l1 = Srgba::from(c1).into_linear();
         let l2 = Srgba::from(c2).into_linear();
 
-        // Take the lighter of each of the RGB components
+        // Take the lighter of each of the sRGB components
         let lighter = l1.lighten(l2);
 
         // Convert back to our Color
-        let r: Color = Srgba::from_linear(lighter).into();
-        assert_eq!(
-            r,
-            Color {
-                r: 0.5,
-                g: 0.5,
-                b: 0.3,
-                a: 1.0
-            }
-        );
+        let result: Color = Srgba::from_linear(lighter).into();
+
+        assert_relative_eq!(result.r, 0.5);
+        assert_relative_eq!(result.g, 0.5);
+        assert_relative_eq!(result.b, 0.3);
+        assert_relative_eq!(result.a, 1.0);
     }
 }
diff --git a/native/src/element.rs b/core/src/element.rs
index 0a677d20..3268f14b 100644
--- a/native/src/element.rs
+++ b/core/src/element.rs
@@ -5,9 +5,7 @@ use crate::overlay;
 use crate::renderer;
 use crate::widget;
 use crate::widget::tree::{self, Tree};
-use crate::{
-    Clipboard, Color, Layout, Length, Point, Rectangle, Shell, Widget,
-};
+use crate::{Clipboard, Color, Layout, Length, Rectangle, Shell, Widget};
 
 use std::any::Any;
 use std::borrow::Borrow;
@@ -90,41 +88,65 @@ impl<'a, Message, Renderer> Element<'a, Message, Renderer> {
     /// We compose the previous __messages__ with the index of the counter
     /// producing them. Let's implement our __view logic__ now:
     ///
-    /// ```
+    /// ```no_run
     /// # mod counter {
-    /// #     type Text<'a> = iced_native::widget::Text<'a, iced_native::renderer::Null>;
-    /// #
     /// #     #[derive(Debug, Clone, Copy)]
     /// #     pub enum Message {}
     /// #     pub struct Counter;
     /// #
     /// #     impl Counter {
-    /// #         pub fn view(&mut self) -> Text {
-    /// #             Text::new("")
+    /// #         pub fn view(
+    /// #             &self,
+    /// #         ) -> iced_core::Element<Message, iced_core::renderer::Null> {
+    /// #             unimplemented!()
     /// #         }
     /// #     }
     /// # }
     /// #
-    /// # mod iced_wgpu {
-    /// #     pub use iced_native::renderer::Null as Renderer;
-    /// # }
+    /// # mod iced {
+    /// #     pub use iced_core::renderer::Null as Renderer;
+    /// #     pub use iced_core::Element;
     /// #
-    /// # use counter::Counter;
+    /// #     pub mod widget {
+    /// #         pub struct Row<Message> {
+    /// #             _t: std::marker::PhantomData<Message>,
+    /// #         }
     /// #
-    /// # struct ManyCounters {
-    /// #     counters: Vec<Counter>,
-    /// # }
+    /// #         impl<Message> Row<Message> {
+    /// #             pub fn new() -> Self {
+    /// #                 unimplemented!()
+    /// #             }
     /// #
-    /// # #[derive(Debug, Clone, Copy)]
-    /// # pub enum Message {
-    /// #    Counter(usize, counter::Message)
+    /// #             pub fn spacing(mut self, _: u32) -> Self {
+    /// #                 unimplemented!()
+    /// #             }
+    /// #
+    /// #             pub fn push(
+    /// #                 mut self,
+    /// #                 _: iced_core::Element<Message, iced_core::renderer::Null>,
+    /// #             ) -> Self {
+    /// #                 unimplemented!()
+    /// #             }
+    /// #         }
+    /// #     }
     /// # }
-    /// use iced_native::Element;
-    /// use iced_native::widget::Row;
-    /// use iced_wgpu::Renderer;
+    /// #
+    /// use counter::Counter;
+    ///
+    /// use iced::widget::Row;
+    /// use iced::{Element, Renderer};
+    ///
+    /// struct ManyCounters {
+    ///     counters: Vec<Counter>,
+    /// }
+    ///
+    /// #[derive(Debug, Clone, Copy)]
+    /// pub enum Message {
+    ///     Counter(usize, counter::Message),
+    /// }
     ///
     /// impl ManyCounters {
-    ///     pub fn view(&mut self) -> Row<Message, Renderer> {
+    ///     pub fn view(&mut self) -> Row<Message> {
     ///         // We can quickly populate a `Row` by folding over our counters
     ///         self.counters.iter_mut().enumerate().fold(
     ///             Row::new().spacing(20),
@@ -137,9 +159,10 @@ impl<'a, Message, Renderer> Element<'a, Message, Renderer> {
     ///                     // Here we turn our `Element<counter::Message>` into
     ///                     // an `Element<Message>` by combining the `index` and the
     ///                     // message of the `element`.
-    ///                     element.map(move |message| Message::Counter(index, message))
+    ///                     element
+    ///                         .map(move |message| Message::Counter(index, message)),
     ///                 )
-    ///             }
+    ///             },
     ///         )
     ///     }
     /// }
@@ -353,7 +376,7 @@ where
         tree: &mut Tree,
         event: Event,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
         renderer: &Renderer,
         clipboard: &mut dyn Clipboard,
         shell: &mut Shell<'_, B>,
@@ -365,7 +388,7 @@ where
             tree,
             event,
             layout,
-            cursor_position,
+            cursor,
             renderer,
             clipboard,
             &mut local_shell,
@@ -383,35 +406,23 @@ where
         theme: &Renderer::Theme,
         style: &renderer::Style,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
         viewport: &Rectangle,
     ) {
-        self.widget.draw(
-            tree,
-            renderer,
-            theme,
-            style,
-            layout,
-            cursor_position,
-            viewport,
-        )
+        self.widget
+            .draw(tree, renderer, theme, style, layout, cursor, viewport)
     }
 
     fn mouse_interaction(
         &self,
         tree: &Tree,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
         viewport: &Rectangle,
         renderer: &Renderer,
     ) -> mouse::Interaction {
-        self.widget.mouse_interaction(
-            tree,
-            layout,
-            cursor_position,
-            viewport,
-            renderer,
-        )
+        self.widget
+            .mouse_interaction(tree, layout, cursor, viewport, renderer)
     }
 
     fn overlay<'b>(
@@ -496,20 +507,14 @@ where
         state: &mut Tree,
         event: Event,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
         renderer: &Renderer,
         clipboard: &mut dyn Clipboard,
         shell: &mut Shell<'_, Message>,
     ) -> event::Status {
-        self.element.widget.on_event(
-            state,
-            event,
-            layout,
-            cursor_position,
-            renderer,
-            clipboard,
-            shell,
-        )
+        self.element
+            .widget
+            .on_event(state, event, layout, cursor, renderer, clipboard, shell)
     }
 
     fn draw(
@@ -519,7 +524,7 @@ where
         theme: &Renderer::Theme,
         style: &renderer::Style,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
         viewport: &Rectangle,
     ) {
         fn explain_layout<Renderer: crate::Renderer>(
@@ -542,15 +547,9 @@ where
             }
         }
 
-        self.element.widget.draw(
-            state,
-            renderer,
-            theme,
-            style,
-            layout,
-            cursor_position,
-            viewport,
-        );
+        self.element
+            .widget
+            .draw(state, renderer, theme, style, layout, cursor, viewport);
 
         explain_layout(renderer, self.color, layout);
     }
@@ -559,17 +558,13 @@ where
         &self,
         state: &Tree,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
         viewport: &Rectangle,
         renderer: &Renderer,
     ) -> mouse::Interaction {
-        self.element.widget.mouse_interaction(
-            state,
-            layout,
-            cursor_position,
-            viewport,
-            renderer,
-        )
+        self.element
+            .widget
+            .mouse_interaction(state, layout, cursor, viewport, renderer)
     }
 
     fn overlay<'b>(
diff --git a/native/src/event.rs b/core/src/event.rs
index eb826399..870b3074 100644
--- a/native/src/event.rs
+++ b/core/src/event.rs
@@ -62,7 +62,7 @@ impl Status {
     /// `Captured` takes precedence over `Ignored`:
     ///
     /// ```
-    /// use iced_native::event::Status;
+    /// use iced_core::event::Status;
     ///
     /// assert_eq!(Status::Ignored.merge(Status::Ignored), Status::Ignored);
     /// assert_eq!(Status::Ignored.merge(Status::Captured), Status::Captured);
diff --git a/core/src/font.rs b/core/src/font.rs
index 3f9ad2b5..bb425fd6 100644
--- a/core/src/font.rs
+++ b/core/src/font.rs
@@ -1,24 +1,102 @@
+//! Load and use fonts.
+use std::hash::Hash;
+
 /// A font.
-#[derive(Debug, Clone, Copy)]
-pub enum Font {
-    /// The default font.
-    ///
-    /// This is normally a font configured in a renderer or loaded from the
-    /// system.
-    Default,
-
-    /// An external font.
-    External {
-        /// The name of the external font
-        name: &'static str,
-
-        /// The bytes of the external font
-        bytes: &'static [u8],
-    },
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
+pub struct Font {
+    /// The [`Family`] of the [`Font`].
+    pub family: Family,
+    /// The [`Weight`] of the [`Font`].
+    pub weight: Weight,
+    /// The [`Stretch`] of the [`Font`].
+    pub stretch: Stretch,
+    /// Whether if the [`Font`] is monospaced or not.
+    pub monospaced: bool,
 }
 
-impl Default for Font {
-    fn default() -> Font {
-        Font::Default
+impl Font {
+    /// A non-monospaced sans-serif font with normal [`Weight`].
+    pub const DEFAULT: Font = Font {
+        family: Family::SansSerif,
+        weight: Weight::Normal,
+        stretch: Stretch::Normal,
+        monospaced: false,
+    };
+
+    /// A monospaced font with normal [`Weight`].
+    pub const MONOSPACE: Font = Font {
+        family: Family::Monospace,
+        monospaced: true,
+        ..Self::DEFAULT
+    };
+
+    /// Creates a non-monospaced [`Font`] with the given [`Family::Name`] and
+    /// normal [`Weight`].
+    pub const fn with_name(name: &'static str) -> Self {
+        Font {
+            family: Family::Name(name),
+            ..Self::DEFAULT
+        }
     }
 }
+
+/// A font family.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
+pub enum Family {
+    /// The name of a font family of choice.
+    Name(&'static str),
+
+    /// Serif fonts represent the formal text style for a script.
+    Serif,
+
+    /// Glyphs in sans-serif fonts, as the term is used in CSS, are generally low
+    /// contrast and have stroke endings that are plain — without any flaring,
+    /// cross stroke, or other ornamentation.
+    #[default]
+    SansSerif,
+
+    /// Glyphs in cursive fonts generally use a more informal script style, and
+    /// the result looks more like handwritten pen or brush writing than printed
+    /// letterwork.
+    Cursive,
+
+    /// Fantasy fonts are primarily decorative or expressive fonts that contain
+    /// decorative or expressive representations of characters.
+    Fantasy,
+
+    /// The sole criterion of a monospace font is that all glyphs have the same
+    /// fixed width.
+    Monospace,
+}
+
+/// The weight of some text.
+#[allow(missing_docs)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
+pub enum Weight {
+    Thin,
+    ExtraLight,
+    Light,
+    #[default]
+    Normal,
+    Medium,
+    Semibold,
+    Bold,
+    ExtraBold,
+    Black,
+}
+
+/// The width of some text.
+#[allow(missing_docs)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
+pub enum Stretch {
+    UltraCondensed,
+    ExtraCondensed,
+    Condensed,
+    SemiCondensed,
+    #[default]
+    Normal,
+    SemiExpanded,
+    Expanded,
+    ExtraExpanded,
+    UltraExpanded,
+}
diff --git a/core/src/gradient.rs b/core/src/gradient.rs
new file mode 100644
index 00000000..e19622fb
--- /dev/null
+++ b/core/src/gradient.rs
@@ -0,0 +1,105 @@
+//! Colors that transition progressively.
+use crate::{Color, Radians};
+
+use std::cmp::Ordering;
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+/// A fill which transitions colors progressively along a direction, either linearly, radially (TBD),
+/// or conically (TBD).
+///
+/// For a gradient which can be used as a fill on a canvas, see [`iced_graphics::Gradient`].
+pub enum Gradient {
+    /// A linear gradient interpolates colors along a direction at a specific [`Angle`].
+    Linear(Linear),
+}
+
+impl Gradient {
+    /// Adjust the opacity of the gradient by a multiplier applied to each color stop.
+    pub fn mul_alpha(mut self, alpha_multiplier: f32) -> Self {
+        match &mut self {
+            Gradient::Linear(linear) => {
+                for stop in linear.stops.iter_mut().flatten() {
+                    stop.color.a *= alpha_multiplier;
+                }
+            }
+        }
+
+        self
+    }
+}
+
+impl From<Linear> for Gradient {
+    fn from(gradient: Linear) -> Self {
+        Self::Linear(gradient)
+    }
+}
+
+#[derive(Debug, Default, Clone, Copy, PartialEq)]
+/// A point along the gradient vector where the specified [`color`] is unmixed.
+///
+/// [`color`]: Self::color
+pub struct ColorStop {
+    /// Offset along the gradient vector.
+    pub offset: f32,
+
+    /// The color of the gradient at the specified [`offset`].
+    ///
+    /// [`offset`]: Self::offset
+    pub color: Color,
+}
+
+/// A linear gradient.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Linear {
+    /// How the [`Gradient`] is angled within its bounds.
+    pub angle: Radians,
+    /// [`ColorStop`]s along the linear gradient path.
+    pub stops: [Option<ColorStop>; 8],
+}
+
+impl Linear {
+    /// Creates a new [`Linear`] gradient with the given angle in [`Radians`].
+    pub fn new(angle: impl Into<Radians>) -> Self {
+        Self {
+            angle: angle.into(),
+            stops: [None; 8],
+        }
+    }
+
+    /// Adds a new [`ColorStop`], defined by an offset and a color, to the gradient.
+    ///
+    /// Any `offset` that is not within `0.0..=1.0` will be silently ignored.
+    ///
+    /// Any stop added after the 8th will be silently ignored.
+    pub fn add_stop(mut self, offset: f32, color: Color) -> Self {
+        if offset.is_finite() && (0.0..=1.0).contains(&offset) {
+            let (Ok(index) | Err(index)) =
+                self.stops.binary_search_by(|stop| match stop {
+                    None => Ordering::Greater,
+                    Some(stop) => stop.offset.partial_cmp(&offset).unwrap(),
+                });
+
+            if index < 8 {
+                self.stops[index] = Some(ColorStop { offset, color });
+            }
+        } else {
+            log::warn!("Gradient color stop must be within 0.0..=1.0 range.");
+        };
+
+        self
+    }
+
+    /// Adds multiple [`ColorStop`]s to the gradient.
+    ///
+    /// Any stop added after the 8th will be silently ignored.
+    pub fn add_stops(
+        mut self,
+        stops: impl IntoIterator<Item = ColorStop>,
+    ) -> Self {
+        for stop in stops.into_iter() {
+            self = self.add_stop(stop.offset, stop.color)
+        }
+
+        self
+    }
+}
diff --git a/native/src/hasher.rs b/core/src/hasher.rs
index fa52f16d..fa52f16d 100644
--- a/native/src/hasher.rs
+++ b/core/src/hasher.rs
diff --git a/native/src/image.rs b/core/src/image.rs
index 70fbade0..85d9d475 100644
--- a/native/src/image.rs
+++ b/core/src/image.rs
@@ -6,7 +6,7 @@ use std::path::PathBuf;
 use std::sync::Arc;
 
 /// A handle of some image data.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub struct Handle {
     id: u64,
     data: Data,
@@ -110,6 +110,14 @@ impl std::hash::Hash for Bytes {
     }
 }
 
+impl PartialEq for Bytes {
+    fn eq(&self, other: &Self) -> bool {
+        self.as_ref() == other.as_ref()
+    }
+}
+
+impl Eq for Bytes {}
+
 impl AsRef<[u8]> for Bytes {
     fn as_ref(&self) -> &[u8] {
         self.0.as_ref().as_ref()
@@ -125,7 +133,7 @@ impl std::ops::Deref for Bytes {
 }
 
 /// The data of a raster image.
-#[derive(Clone, Hash)]
+#[derive(Clone, PartialEq, Eq, Hash)]
 pub enum Data {
     /// File data
     Path(PathBuf),
diff --git a/native/src/layout.rs b/core/src/layout.rs
index 04954fb9..04954fb9 100644
--- a/native/src/layout.rs
+++ b/core/src/layout.rs
diff --git a/native/src/layout/DRUID_LICENSE b/core/src/layout/DRUID_LICENSE
index d6456956..d6456956 100644
--- a/native/src/layout/DRUID_LICENSE
+++ b/core/src/layout/DRUID_LICENSE
diff --git a/native/src/layout/flex.rs b/core/src/layout/flex.rs
index 8b967849..8b967849 100644
--- a/native/src/layout/flex.rs
+++ b/core/src/layout/flex.rs
diff --git a/native/src/layout/limits.rs b/core/src/layout/limits.rs
index 5d3c1556..5d3c1556 100644
--- a/native/src/layout/limits.rs
+++ b/core/src/layout/limits.rs
diff --git a/native/src/layout/node.rs b/core/src/layout/node.rs
index 2b44a7d5..2b44a7d5 100644
--- a/native/src/layout/node.rs
+++ b/core/src/layout/node.rs
diff --git a/core/src/length.rs b/core/src/length.rs
index bb925c4b..3adb996e 100644
--- a/core/src/length.rs
+++ b/core/src/length.rs
@@ -1,3 +1,5 @@
+use crate::Pixels;
+
 /// The strategy used to fill space in a specific dimension.
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub enum Length {
@@ -36,6 +38,12 @@ impl Length {
     }
 }
 
+impl From<Pixels> for Length {
+    fn from(amount: Pixels) -> Self {
+        Length::Fixed(f32::from(amount))
+    }
+}
+
 impl From<f32> for Length {
     fn from(amount: f32) -> Self {
         Length::Fixed(amount)
diff --git a/core/src/lib.rs b/core/src/lib.rs
index d3596b4d..76d775e7 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -7,7 +7,7 @@
 //! ![The foundations of the Iced ecosystem](https://github.com/iced-rs/iced/blob/0525d76ff94e828b7b21634fa94a747022001c83/docs/graphs/foundations.png?raw=true)
 //!
 //! [Iced]: https://github.com/iced-rs/iced
-//! [`iced_native`]: https://github.com/iced-rs/iced/tree/0.8/native
+//! [`iced_native`]: https://github.com/iced-rs/iced/tree/0.9/native
 //! [`iced_web`]: https://github.com/iced-rs/iced_web
 #![doc(
     html_logo_url = "https://raw.githubusercontent.com/iced-rs/iced/9ab6923e943f784985e9ef9ca28b10278297225d/docs/logo.svg"
@@ -25,31 +25,61 @@
 #![forbid(unsafe_code, rust_2018_idioms)]
 #![allow(clippy::inherent_to_string, clippy::type_complexity)]
 pub mod alignment;
+pub mod clipboard;
+pub mod event;
+pub mod font;
+pub mod gradient;
+pub mod image;
 pub mod keyboard;
+pub mod layout;
 pub mod mouse;
+pub mod overlay;
+pub mod renderer;
+pub mod svg;
+pub mod text;
 pub mod time;
+pub mod touch;
+pub mod widget;
+pub mod window;
 
+mod angle;
 mod background;
+mod border_radius;
 mod color;
 mod content_fit;
-mod font;
+mod element;
+mod hasher;
 mod length;
 mod padding;
 mod pixels;
 mod point;
 mod rectangle;
+mod shell;
 mod size;
 mod vector;
 
 pub use alignment::Alignment;
+pub use angle::{Degrees, Radians};
 pub use background::Background;
+pub use border_radius::BorderRadius;
+pub use clipboard::Clipboard;
 pub use color::Color;
 pub use content_fit::ContentFit;
+pub use element::Element;
+pub use event::Event;
 pub use font::Font;
+pub use gradient::Gradient;
+pub use hasher::Hasher;
+pub use layout::Layout;
 pub use length::Length;
+pub use overlay::Overlay;
 pub use padding::Padding;
 pub use pixels::Pixels;
 pub use point::Point;
 pub use rectangle::Rectangle;
+pub use renderer::Renderer;
+pub use shell::Shell;
 pub use size::Size;
+pub use text::Text;
 pub use vector::Vector;
+pub use widget::Widget;
diff --git a/core/src/mouse.rs b/core/src/mouse.rs
index 48214f65..d13a60fb 100644
--- a/core/src/mouse.rs
+++ b/core/src/mouse.rs
@@ -1,8 +1,13 @@
 //! Handle mouse events.
+pub mod click;
+
 mod button;
+mod cursor;
 mod event;
 mod interaction;
 
 pub use button::Button;
+pub use click::Click;
+pub use cursor::Cursor;
 pub use event::{Event, ScrollDelta};
 pub use interaction::Interaction;
diff --git a/core/src/mouse/button.rs b/core/src/mouse/button.rs
index aeb8a55d..3eec7f42 100644
--- a/core/src/mouse/button.rs
+++ b/core/src/mouse/button.rs
@@ -11,5 +11,5 @@ pub enum Button {
     Middle,
 
     /// Some other button.
-    Other(u8),
+    Other(u16),
 }
diff --git a/native/src/mouse/click.rs b/core/src/mouse/click.rs
index 4a7d796c..4a7d796c 100644
--- a/native/src/mouse/click.rs
+++ b/core/src/mouse/click.rs
diff --git a/core/src/mouse/cursor.rs b/core/src/mouse/cursor.rs
new file mode 100644
index 00000000..203526e9
--- /dev/null
+++ b/core/src/mouse/cursor.rs
@@ -0,0 +1,52 @@
+use crate::{Point, Rectangle, Vector};
+
+/// The mouse cursor state.
+#[derive(Debug, Clone, Copy, PartialEq, Default)]
+pub enum Cursor {
+    /// The cursor has a defined position.
+    Available(Point),
+
+    /// The cursor is currently unavailable (i.e. out of bounds or busy).
+    #[default]
+    Unavailable,
+}
+
+impl Cursor {
+    /// Returns the absolute position of the [`Cursor`], if available.
+    pub fn position(self) -> Option<Point> {
+        match self {
+            Cursor::Available(position) => Some(position),
+            Cursor::Unavailable => None,
+        }
+    }
+
+    /// Returns the absolute position of the [`Cursor`], if available and inside
+    /// the given bounds.
+    ///
+    /// If the [`Cursor`] is not over the provided bounds, this method will
+    /// return `None`.
+    pub fn position_over(self, bounds: Rectangle) -> Option<Point> {
+        self.position().filter(|p| bounds.contains(*p))
+    }
+
+    /// Returns the relative position of the [`Cursor`] inside the given bounds,
+    /// if available.
+    ///
+    /// If the [`Cursor`] is not over the provided bounds, this method will
+    /// return `None`.
+    pub fn position_in(self, bounds: Rectangle) -> Option<Point> {
+        self.position_over(bounds)
+            .map(|p| p - Vector::new(bounds.x, bounds.y))
+    }
+
+    /// Returns the relative position of the [`Cursor`] from the given origin,
+    /// if available.
+    pub fn position_from(self, origin: Point) -> Option<Point> {
+        self.position().map(|p| p - Vector::new(origin.x, origin.y))
+    }
+
+    /// Returns true if the [`Cursor`] is over the given `bounds`.
+    pub fn is_over(self, bounds: Rectangle) -> bool {
+        self.position_over(bounds).is_some()
+    }
+}
diff --git a/core/src/mouse/interaction.rs b/core/src/mouse/interaction.rs
index 664147a7..072033fd 100644
--- a/core/src/mouse/interaction.rs
+++ b/core/src/mouse/interaction.rs
@@ -1,7 +1,8 @@
 /// The interaction of a mouse cursor.
-#[derive(Debug, Eq, PartialEq, Clone, Copy, PartialOrd, Ord)]
+#[derive(Debug, Eq, PartialEq, Clone, Copy, PartialOrd, Ord, Default)]
 #[allow(missing_docs)]
 pub enum Interaction {
+    #[default]
     Idle,
     Pointer,
     Grab,
@@ -11,10 +12,5 @@ pub enum Interaction {
     Grabbing,
     ResizingHorizontally,
     ResizingVertically,
-}
-
-impl Default for Interaction {
-    fn default() -> Interaction {
-        Interaction::Idle
-    }
+    NotAllowed,
 }
diff --git a/native/src/overlay.rs b/core/src/overlay.rs
index 6cada416..2e05db93 100644
--- a/native/src/overlay.rs
+++ b/core/src/overlay.rs
@@ -2,11 +2,8 @@
 mod element;
 mod group;
 
-pub mod menu;
-
 pub use element::Element;
 pub use group::Group;
-pub use menu::Menu;
 
 use crate::event::{self, Event};
 use crate::layout;
@@ -41,7 +38,7 @@ where
         theme: &Renderer::Theme,
         style: &renderer::Style,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
     );
 
     /// Applies a [`widget::Operation`] to the [`Overlay`].
@@ -69,7 +66,7 @@ where
         &mut self,
         _event: Event,
         _layout: Layout<'_>,
-        _cursor_position: Point,
+        _cursor: mouse::Cursor,
         _renderer: &Renderer,
         _clipboard: &mut dyn Clipboard,
         _shell: &mut Shell<'_, Message>,
@@ -83,7 +80,7 @@ where
     fn mouse_interaction(
         &self,
         _layout: Layout<'_>,
-        _cursor_position: Point,
+        _cursor: mouse::Cursor,
         _viewport: &Rectangle,
         _renderer: &Renderer,
     ) -> mouse::Interaction {
@@ -94,9 +91,23 @@ where
     ///
     /// By default, it returns true if the bounds of the `layout` contain
     /// the `cursor_position`.
-    fn is_over(&self, layout: Layout<'_>, cursor_position: Point) -> bool {
+    fn is_over(
+        &self,
+        layout: Layout<'_>,
+        _renderer: &Renderer,
+        cursor_position: Point,
+    ) -> bool {
         layout.bounds().contains(cursor_position)
     }
+
+    /// Returns the nested overlay of the [`Overlay`], if there is any.
+    fn overlay<'a>(
+        &'a mut self,
+        _layout: Layout<'_>,
+        _renderer: &Renderer,
+    ) -> Option<Element<'a, Message, Renderer>> {
+        None
+    }
 }
 
 /// Returns a [`Group`] of overlay [`Element`] children.
diff --git a/native/src/overlay/element.rs b/core/src/overlay/element.rs
index 237d25d1..c2134343 100644
--- a/native/src/overlay/element.rs
+++ b/core/src/overlay/element.rs
@@ -68,35 +68,25 @@ where
         &mut self,
         event: Event,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
         renderer: &Renderer,
         clipboard: &mut dyn Clipboard,
         shell: &mut Shell<'_, Message>,
     ) -> event::Status {
-        self.overlay.on_event(
-            event,
-            layout,
-            cursor_position,
-            renderer,
-            clipboard,
-            shell,
-        )
+        self.overlay
+            .on_event(event, layout, cursor, renderer, clipboard, shell)
     }
 
     /// Returns the current [`mouse::Interaction`] of the [`Element`].
     pub fn mouse_interaction(
         &self,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
         viewport: &Rectangle,
         renderer: &Renderer,
     ) -> mouse::Interaction {
-        self.overlay.mouse_interaction(
-            layout,
-            cursor_position,
-            viewport,
-            renderer,
-        )
+        self.overlay
+            .mouse_interaction(layout, cursor, viewport, renderer)
     }
 
     /// Draws the [`Element`] and its children using the given [`Layout`].
@@ -106,10 +96,9 @@ where
         theme: &Renderer::Theme,
         style: &renderer::Style,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
     ) {
-        self.overlay
-            .draw(renderer, theme, style, layout, cursor_position)
+        self.overlay.draw(renderer, theme, style, layout, cursor)
     }
 
     /// Applies a [`widget::Operation`] to the [`Element`].
@@ -123,8 +112,22 @@ where
     }
 
     /// Returns true if the cursor is over the [`Element`].
-    pub fn is_over(&self, layout: Layout<'_>, cursor_position: Point) -> bool {
-        self.overlay.is_over(layout, cursor_position)
+    pub fn is_over(
+        &self,
+        layout: Layout<'_>,
+        renderer: &Renderer,
+        cursor_position: Point,
+    ) -> bool {
+        self.overlay.is_over(layout, renderer, cursor_position)
+    }
+
+    /// Returns the nested overlay of the [`Element`], if there is any.
+    pub fn overlay<'b>(
+        &'b mut self,
+        layout: Layout<'_>,
+        renderer: &Renderer,
+    ) -> Option<Element<'b, Message, Renderer>> {
+        self.overlay.overlay(layout, renderer)
     }
 }
 
@@ -215,7 +218,7 @@ where
         &mut self,
         event: Event,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
         renderer: &Renderer,
         clipboard: &mut dyn Clipboard,
         shell: &mut Shell<'_, B>,
@@ -226,7 +229,7 @@ where
         let event_status = self.content.on_event(
             event,
             layout,
-            cursor_position,
+            cursor,
             renderer,
             clipboard,
             &mut local_shell,
@@ -240,16 +243,12 @@ where
     fn mouse_interaction(
         &self,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
         viewport: &Rectangle,
         renderer: &Renderer,
     ) -> mouse::Interaction {
-        self.content.mouse_interaction(
-            layout,
-            cursor_position,
-            viewport,
-            renderer,
-        )
+        self.content
+            .mouse_interaction(layout, cursor, viewport, renderer)
     }
 
     fn draw(
@@ -258,13 +257,27 @@ where
         theme: &Renderer::Theme,
         style: &renderer::Style,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
     ) {
-        self.content
-            .draw(renderer, theme, style, layout, cursor_position)
+        self.content.draw(renderer, theme, style, layout, cursor)
     }
 
-    fn is_over(&self, layout: Layout<'_>, cursor_position: Point) -> bool {
-        self.content.is_over(layout, cursor_position)
+    fn is_over(
+        &self,
+        layout: Layout<'_>,
+        renderer: &Renderer,
+        cursor_position: Point,
+    ) -> bool {
+        self.content.is_over(layout, renderer, cursor_position)
+    }
+
+    fn overlay<'b>(
+        &'b mut self,
+        layout: Layout<'_>,
+        renderer: &Renderer,
+    ) -> Option<Element<'b, B, Renderer>> {
+        self.content
+            .overlay(layout, renderer)
+            .map(|overlay| overlay.map(self.mapper))
     }
 }
diff --git a/native/src/overlay/group.rs b/core/src/overlay/group.rs
index 1126f0cf..deffaad0 100644
--- a/native/src/overlay/group.rs
+++ b/core/src/overlay/group.rs
@@ -1,12 +1,10 @@
-use iced_core::{Point, Rectangle, Size};
-
 use crate::event;
 use crate::layout;
 use crate::mouse;
 use crate::overlay;
 use crate::renderer;
 use crate::widget;
-use crate::{Clipboard, Event, Layout, Overlay, Shell};
+use crate::{Clipboard, Event, Layout, Overlay, Point, Rectangle, Shell, Size};
 
 /// An [`Overlay`] container that displays multiple overlay [`overlay::Element`]
 /// children.
@@ -83,7 +81,7 @@ where
         &mut self,
         event: Event,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
         renderer: &Renderer,
         clipboard: &mut dyn Clipboard,
         shell: &mut Shell<'_, Message>,
@@ -95,7 +93,7 @@ where
                 child.on_event(
                     event.clone(),
                     layout,
-                    cursor_position,
+                    cursor,
                     renderer,
                     clipboard,
                     shell,
@@ -110,17 +108,17 @@ where
         theme: &<Renderer as crate::Renderer>::Theme,
         style: &renderer::Style,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
     ) {
         for (child, layout) in self.children.iter().zip(layout.children()) {
-            child.draw(renderer, theme, style, layout, cursor_position);
+            child.draw(renderer, theme, style, layout, cursor);
         }
     }
 
     fn mouse_interaction(
         &self,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
         viewport: &Rectangle,
         renderer: &Renderer,
     ) -> mouse::Interaction {
@@ -128,12 +126,7 @@ where
             .iter()
             .zip(layout.children())
             .map(|(child, layout)| {
-                child.mouse_interaction(
-                    layout,
-                    cursor_position,
-                    viewport,
-                    renderer,
-                )
+                child.mouse_interaction(layout, cursor, viewport, renderer)
             })
             .max()
             .unwrap_or_default()
@@ -154,11 +147,33 @@ where
         });
     }
 
-    fn is_over(&self, layout: Layout<'_>, cursor_position: Point) -> bool {
+    fn is_over(
+        &self,
+        layout: Layout<'_>,
+        renderer: &Renderer,
+        cursor_position: Point,
+    ) -> bool {
         self.children
             .iter()
             .zip(layout.children())
-            .any(|(child, layout)| child.is_over(layout, cursor_position))
+            .any(|(child, layout)| {
+                child.is_over(layout, renderer, cursor_position)
+            })
+    }
+
+    fn overlay<'b>(
+        &'b mut self,
+        layout: Layout<'_>,
+        renderer: &Renderer,
+    ) -> Option<overlay::Element<'b, Message, Renderer>> {
+        let children = self
+            .children
+            .iter_mut()
+            .zip(layout.children())
+            .filter_map(|(child, layout)| child.overlay(layout, renderer))
+            .collect::<Vec<_>>();
+
+        (!children.is_empty()).then(|| Group::with_children(children).overlay())
     }
 }
 
diff --git a/core/src/pixels.rs b/core/src/pixels.rs
index e42cd9f9..6a9e5c88 100644
--- a/core/src/pixels.rs
+++ b/core/src/pixels.rs
@@ -20,3 +20,9 @@ impl From<u16> for Pixels {
         Self(f32::from(amount))
     }
 }
+
+impl From<Pixels> for f32 {
+    fn from(pixels: Pixels) -> Self {
+        pixels.0
+    }
+}
diff --git a/core/src/rectangle.rs b/core/src/rectangle.rs
index 4fe91519..7ff324cb 100644
--- a/core/src/rectangle.rs
+++ b/core/src/rectangle.rs
@@ -66,6 +66,11 @@ impl Rectangle<f32> {
         Size::new(self.width, self.height)
     }
 
+    /// Returns the area of the [`Rectangle`].
+    pub fn area(&self) -> f32 {
+        self.width * self.height
+    }
+
     /// Returns true if the given [`Point`] is contained in the [`Rectangle`].
     pub fn contains(&self, point: Point) -> bool {
         self.x <= point.x
@@ -74,6 +79,15 @@ impl Rectangle<f32> {
             && point.y <= self.y + self.height
     }
 
+    /// Returns true if the current [`Rectangle`] is completely within the given
+    /// `container`.
+    pub fn is_within(&self, container: &Rectangle) -> bool {
+        container.contains(self.position())
+            && container.contains(
+                self.position() + Vector::new(self.width, self.height),
+            )
+    }
+
     /// Computes the intersection with the given [`Rectangle`].
     pub fn intersection(
         &self,
@@ -100,6 +114,30 @@ impl Rectangle<f32> {
         }
     }
 
+    /// Returns whether the [`Rectangle`] intersects with the given one.
+    pub fn intersects(&self, other: &Self) -> bool {
+        self.intersection(other).is_some()
+    }
+
+    /// Computes the union with the given [`Rectangle`].
+    pub fn union(&self, other: &Self) -> Self {
+        let x = self.x.min(other.x);
+        let y = self.y.min(other.y);
+
+        let lower_right_x = (self.x + self.width).max(other.x + other.width);
+        let lower_right_y = (self.y + self.height).max(other.y + other.height);
+
+        let width = lower_right_x - x;
+        let height = lower_right_y - y;
+
+        Rectangle {
+            x,
+            y,
+            width,
+            height,
+        }
+    }
+
     /// Snaps the [`Rectangle`] to __unsigned__ integer coordinates.
     pub fn snap(self) -> Rectangle<u32> {
         Rectangle {
@@ -109,6 +147,16 @@ impl Rectangle<f32> {
             height: self.height as u32,
         }
     }
+
+    /// Expands the [`Rectangle`] a given amount.
+    pub fn expand(self, amount: f32) -> Self {
+        Self {
+            x: self.x - amount,
+            y: self.y - amount,
+            width: self.width + amount * 2.0,
+            height: self.height + amount * 2.0,
+        }
+    }
 }
 
 impl std::ops::Mul<f32> for Rectangle<f32> {
diff --git a/native/src/renderer.rs b/core/src/renderer.rs
index 2ac78982..7c73d2e4 100644
--- a/native/src/renderer.rs
+++ b/core/src/renderer.rs
@@ -1,11 +1,12 @@
 //! Write your own renderer.
 #[cfg(debug_assertions)]
 mod null;
+
 #[cfg(debug_assertions)]
 pub use null::Null;
 
 use crate::layout;
-use crate::{Background, Color, Element, Rectangle, Vector};
+use crate::{Background, BorderRadius, Color, Element, Rectangle, Vector};
 
 /// A component that can be used by widgets to draw themselves on a screen.
 pub trait Renderer: Sized {
@@ -59,29 +60,6 @@ pub struct Quad {
     pub border_color: Color,
 }
 
-/// The border radi for the corners of a graphics primitive in the order:
-/// top-left, top-right, bottom-right, bottom-left.
-#[derive(Debug, Clone, Copy, PartialEq, Default)]
-pub struct BorderRadius([f32; 4]);
-
-impl From<f32> for BorderRadius {
-    fn from(w: f32) -> Self {
-        Self([w; 4])
-    }
-}
-
-impl From<[f32; 4]> for BorderRadius {
-    fn from(radi: [f32; 4]) -> Self {
-        Self(radi)
-    }
-}
-
-impl From<BorderRadius> for [f32; 4] {
-    fn from(radi: BorderRadius) -> Self {
-        radi.0
-    }
-}
-
 /// The styling attributes of a [`Renderer`].
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub struct Style {
diff --git a/native/src/renderer/null.rs b/core/src/renderer/null.rs
index 9376d540..5d49699e 100644
--- a/native/src/renderer/null.rs
+++ b/core/src/renderer/null.rs
@@ -1,6 +1,8 @@
 use crate::renderer::{self, Renderer};
 use crate::text::{self, Text};
-use crate::{Background, Font, Point, Rectangle, Size, Theme, Vector};
+use crate::{Background, Font, Point, Rectangle, Size, Vector};
+
+use std::borrow::Cow;
 
 /// A renderer that does nothing.
 ///
@@ -16,7 +18,7 @@ impl Null {
 }
 
 impl Renderer for Null {
-    type Theme = Theme;
+    type Theme = ();
 
     fn with_layer(&mut self, _bounds: Rectangle, _f: impl FnOnce(&mut Self)) {}
 
@@ -40,30 +42,40 @@ impl Renderer for Null {
 impl text::Renderer for Null {
     type Font = Font;
 
-    const ICON_FONT: Font = Font::Default;
+    const ICON_FONT: Font = Font::DEFAULT;
     const CHECKMARK_ICON: char = '0';
     const ARROW_DOWN_ICON: char = '0';
 
+    fn default_font(&self) -> Self::Font {
+        Font::default()
+    }
+
     fn default_size(&self) -> f32 {
-        20.0
+        16.0
     }
 
+    fn load_font(&mut self, _font: Cow<'static, [u8]>) {}
+
     fn measure(
         &self,
         _content: &str,
         _size: f32,
+        _line_height: text::LineHeight,
         _font: Font,
         _bounds: Size,
-    ) -> (f32, f32) {
-        (0.0, 20.0)
+        _shaping: text::Shaping,
+    ) -> Size {
+        Size::new(0.0, 20.0)
     }
 
     fn hit_test(
         &self,
         _contents: &str,
         _size: f32,
+        _line_height: text::LineHeight,
         _font: Self::Font,
         _bounds: Size,
+        _shaping: text::Shaping,
         _point: Point,
         _nearest_only: bool,
     ) -> Option<text::Hit> {
diff --git a/native/src/shell.rs b/core/src/shell.rs
index 74a5c616..74a5c616 100644
--- a/native/src/shell.rs
+++ b/core/src/shell.rs
diff --git a/core/src/size.rs b/core/src/size.rs
index fbe940ef..7ef2f602 100644
--- a/core/src/size.rs
+++ b/core/src/size.rs
@@ -1,7 +1,7 @@
 use crate::{Padding, Vector};
 
 /// An amount of space in 2 dimensions.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct Size<T = f32> {
     /// The width.
     pub width: T,
diff --git a/native/src/svg.rs b/core/src/svg.rs
index 9b98877a..54e9434e 100644
--- a/native/src/svg.rs
+++ b/core/src/svg.rs
@@ -7,7 +7,7 @@ use std::path::PathBuf;
 use std::sync::Arc;
 
 /// A handle of Svg data.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub struct Handle {
     id: u64,
     data: Arc<Data>,
@@ -57,7 +57,7 @@ impl Hash for Handle {
 }
 
 /// The data of a vectorial image.
-#[derive(Clone, Hash)]
+#[derive(Clone, Hash, PartialEq, Eq)]
 pub enum Data {
     /// File data
     Path(PathBuf),
diff --git a/core/src/text.rs b/core/src/text.rs
new file mode 100644
index 00000000..fc8aa20e
--- /dev/null
+++ b/core/src/text.rs
@@ -0,0 +1,212 @@
+//! Draw and interact with text.
+use crate::alignment;
+use crate::{Color, Pixels, Point, Rectangle, Size};
+
+use std::borrow::Cow;
+use std::hash::{Hash, Hasher};
+
+/// A paragraph.
+#[derive(Debug, Clone, Copy)]
+pub struct Text<'a, Font> {
+    /// The content of the paragraph.
+    pub content: &'a str,
+
+    /// The bounds of the paragraph.
+    pub bounds: Rectangle,
+
+    /// The size of the [`Text`] in logical pixels.
+    pub size: f32,
+
+    /// The line height of the [`Text`].
+    pub line_height: LineHeight,
+
+    /// The color of the [`Text`].
+    pub color: Color,
+
+    /// The font of the [`Text`].
+    pub font: Font,
+
+    /// The horizontal alignment of the [`Text`].
+    pub horizontal_alignment: alignment::Horizontal,
+
+    /// The vertical alignment of the [`Text`].
+    pub vertical_alignment: alignment::Vertical,
+
+    /// The [`Shaping`] strategy of the [`Text`].
+    pub shaping: Shaping,
+}
+
+/// The shaping strategy of some text.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
+pub enum Shaping {
+    /// No shaping and no font fallback.
+    ///
+    /// This shaping strategy is very cheap, but it will not display complex
+    /// scripts properly nor try to find missing glyphs in your system fonts.
+    ///
+    /// You should use this strategy when you have complete control of the text
+    /// and the font you are displaying in your application.
+    ///
+    /// This is the default.
+    #[default]
+    Basic,
+    /// Advanced text shaping and font fallback.
+    ///
+    /// You will need to enable this flag if the text contains a complex
+    /// script, the font used needs it, and/or multiple fonts in your system
+    /// may be needed to display all of the glyphs.
+    ///
+    /// Advanced shaping is expensive! You should only enable it when necessary.
+    Advanced,
+}
+
+/// The height of a line of text in a paragraph.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum LineHeight {
+    /// A factor of the size of the text.
+    Relative(f32),
+
+    /// An absolute height in logical pixels.
+    Absolute(Pixels),
+}
+
+impl LineHeight {
+    /// Returns the [`LineHeight`] in absolute logical pixels.
+    pub fn to_absolute(self, text_size: Pixels) -> Pixels {
+        match self {
+            Self::Relative(factor) => Pixels(factor * text_size.0),
+            Self::Absolute(pixels) => pixels,
+        }
+    }
+}
+
+impl Default for LineHeight {
+    fn default() -> Self {
+        Self::Relative(1.3)
+    }
+}
+
+impl From<f32> for LineHeight {
+    fn from(factor: f32) -> Self {
+        Self::Relative(factor)
+    }
+}
+
+impl From<Pixels> for LineHeight {
+    fn from(pixels: Pixels) -> Self {
+        Self::Absolute(pixels)
+    }
+}
+
+impl Hash for LineHeight {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        match self {
+            Self::Relative(factor) => {
+                state.write_u8(0);
+                factor.to_bits().hash(state);
+            }
+            Self::Absolute(pixels) => {
+                state.write_u8(1);
+                f32::from(*pixels).to_bits().hash(state);
+            }
+        }
+    }
+}
+
+/// The result of hit testing on text.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum Hit {
+    /// The point was within the bounds of the returned character index.
+    CharOffset(usize),
+}
+
+impl Hit {
+    /// Computes the cursor position of the [`Hit`] .
+    pub fn cursor(self) -> usize {
+        match self {
+            Self::CharOffset(i) => i,
+        }
+    }
+}
+
+/// A renderer capable of measuring and drawing [`Text`].
+pub trait Renderer: crate::Renderer {
+    /// The font type used.
+    type Font: Copy;
+
+    /// The icon font of the backend.
+    const ICON_FONT: Self::Font;
+
+    /// The `char` representing a ✔ icon in the [`ICON_FONT`].
+    ///
+    /// [`ICON_FONT`]: Self::ICON_FONT
+    const CHECKMARK_ICON: char;
+
+    /// The `char` representing a ▼ icon in the built-in [`ICON_FONT`].
+    ///
+    /// [`ICON_FONT`]: Self::ICON_FONT
+    const ARROW_DOWN_ICON: char;
+
+    /// Returns the default [`Self::Font`].
+    fn default_font(&self) -> Self::Font;
+
+    /// Returns the default size of [`Text`].
+    fn default_size(&self) -> f32;
+
+    /// Measures the text in the given bounds and returns the minimum boundaries
+    /// that can fit the contents.
+    fn measure(
+        &self,
+        content: &str,
+        size: f32,
+        line_height: LineHeight,
+        font: Self::Font,
+        bounds: Size,
+        shaping: Shaping,
+    ) -> Size;
+
+    /// Measures the width of the text as if it were laid out in a single line.
+    fn measure_width(
+        &self,
+        content: &str,
+        size: f32,
+        font: Self::Font,
+        shaping: Shaping,
+    ) -> f32 {
+        let bounds = self.measure(
+            content,
+            size,
+            LineHeight::Absolute(Pixels(size)),
+            font,
+            Size::INFINITY,
+            shaping,
+        );
+
+        bounds.width
+    }
+
+    /// Tests whether the provided point is within the boundaries of text
+    /// laid out with the given parameters, returning information about
+    /// the nearest character.
+    ///
+    /// If `nearest_only` is true, the hit test does not consider whether the
+    /// the point is interior to any glyph bounds, returning only the character
+    /// with the nearest centeroid.
+    fn hit_test(
+        &self,
+        contents: &str,
+        size: f32,
+        line_height: LineHeight,
+        font: Self::Font,
+        bounds: Size,
+        shaping: Shaping,
+        point: Point,
+        nearest_only: bool,
+    ) -> Option<Hit>;
+
+    /// Loads a [`Self::Font`] from its bytes.
+    fn load_font(&mut self, font: Cow<'static, [u8]>);
+
+    /// Draws the given [`Text`].
+    fn fill_text(&mut self, text: Text<'_, Self::Font>);
+}
diff --git a/native/src/touch.rs b/core/src/touch.rs
index 18120644..18120644 100644
--- a/native/src/touch.rs
+++ b/core/src/touch.rs
diff --git a/native/src/widget.rs b/core/src/widget.rs
index 2b3ca7be..79d86444 100644
--- a/native/src/widget.rs
+++ b/core/src/widget.rs
@@ -1,98 +1,21 @@
-//! Use the built-in widgets or create your own.
-//!
-//! # Built-in widgets
-//! Every built-in drawable widget has its own module with a `Renderer` trait
-//! that must be implemented by a [renderer] before being able to use it as
-//! a [`Widget`].
-//!
-//! # Custom widgets
-//! If you want to implement a custom widget, you simply need to implement the
-//! [`Widget`] trait. You can use the API of the built-in widgets as a guide or
-//! source of inspiration.
-//!
-//! [renderer]: crate::renderer
-pub mod button;
-pub mod checkbox;
-pub mod column;
-pub mod container;
-pub mod helpers;
-pub mod image;
+//! Create custom widgets and operate on them.
 pub mod operation;
-pub mod pane_grid;
-pub mod pick_list;
-pub mod progress_bar;
-pub mod radio;
-pub mod row;
-pub mod rule;
-pub mod scrollable;
-pub mod slider;
-pub mod space;
-pub mod svg;
 pub mod text;
-pub mod text_input;
-pub mod toggler;
-pub mod tooltip;
 pub mod tree;
-pub mod vertical_slider;
 
-mod action;
 mod id;
 
-#[doc(no_inline)]
-pub use button::Button;
-#[doc(no_inline)]
-pub use checkbox::Checkbox;
-#[doc(no_inline)]
-pub use column::Column;
-#[doc(no_inline)]
-pub use container::Container;
-#[doc(no_inline)]
-pub use helpers::*;
-#[doc(no_inline)]
-pub use image::Image;
-#[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 row::Row;
-#[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 space::Space;
-#[doc(no_inline)]
-pub use svg::Svg;
-#[doc(no_inline)]
-pub use text::Text;
-#[doc(no_inline)]
-pub use text_input::TextInput;
-#[doc(no_inline)]
-pub use toggler::Toggler;
-#[doc(no_inline)]
-pub use tooltip::Tooltip;
-#[doc(no_inline)]
-pub use tree::Tree;
-#[doc(no_inline)]
-pub use vertical_slider::VerticalSlider;
-
-pub use action::Action;
 pub use id::Id;
 pub use operation::Operation;
+pub use text::Text;
+pub use tree::Tree;
 
 use crate::event::{self, Event};
-use crate::layout;
+use crate::layout::{self, Layout};
 use crate::mouse;
 use crate::overlay;
 use crate::renderer;
-use crate::{Clipboard, Layout, Length, Point, Rectangle, Shell};
+use crate::{Clipboard, Length, Rectangle, Shell};
 
 /// A component that displays information and allows interaction.
 ///
@@ -110,12 +33,12 @@ use crate::{Clipboard, Layout, Length, Point, Rectangle, Shell};
 /// - [`geometry`], a custom widget showcasing how to draw geometry with the
 /// `Mesh2D` primitive in [`iced_wgpu`].
 ///
-/// [examples]: https://github.com/iced-rs/iced/tree/0.8/examples
-/// [`bezier_tool`]: https://github.com/iced-rs/iced/tree/0.8/examples/bezier_tool
-/// [`custom_widget`]: https://github.com/iced-rs/iced/tree/0.8/examples/custom_widget
-/// [`geometry`]: https://github.com/iced-rs/iced/tree/0.8/examples/geometry
+/// [examples]: https://github.com/iced-rs/iced/tree/0.9/examples
+/// [`bezier_tool`]: https://github.com/iced-rs/iced/tree/0.9/examples/bezier_tool
+/// [`custom_widget`]: https://github.com/iced-rs/iced/tree/0.9/examples/custom_widget
+/// [`geometry`]: https://github.com/iced-rs/iced/tree/0.9/examples/geometry
 /// [`lyon`]: https://github.com/nical/lyon
-/// [`iced_wgpu`]: https://github.com/iced-rs/iced/tree/0.8/wgpu
+/// [`iced_wgpu`]: https://github.com/iced-rs/iced/tree/0.9/wgpu
 pub trait Widget<Message, Renderer>
 where
     Renderer: crate::Renderer,
@@ -144,7 +67,7 @@ where
         theme: &Renderer::Theme,
         style: &renderer::Style,
         layout: Layout<'_>,
-        cursor_position: Point,
+        cursor: mouse::Cursor,
         viewport: &Rectangle,
     );
 
@@ -188,7 +111,7 @@ where
         _state: &mut Tree,
         _event: Event,
         _layout: Layout<'_>,
-        _cursor_position: Point,
+        _cursor: mouse::Cursor,
         _renderer: &Renderer,
         _clipboard: &mut dyn Clipboard,
         _shell: &mut Shell<'_, Message>,
@@ -203,7 +126,7 @@ where
         &self,
         _state: &Tree,
         _layout: Layout<'_>,
-        _cursor_position: Point,
+        _cursor: mouse::Cursor,
         _viewport: &Rectangle,
         _renderer: &Renderer,
     ) -> mouse::Interaction {
diff --git a/native/src/widget/id.rs b/core/src/widget/id.rs
index 4b8fedf1..ae739bb7 100644
--- a/native/src/widget/id.rs
+++ b/core/src/widget/id.rs
@@ -24,7 +24,7 @@ impl Id {
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
-pub enum Internal {
+enum Internal {
     Unique(usize),
     Custom(borrow::Cow<'static, str>),
 }
diff --git a/core/src/widget/operation.rs b/core/src/widget/operation.rs
new file mode 100644
index 00000000..ad188c36
--- /dev/null
+++ b/core/src/widget/operation.rs
@@ -0,0 +1,226 @@
+//! Query or update internal widget state.
+pub mod focusable;
+pub mod scrollable;
+pub mod text_input;
+
+pub use focusable::Focusable;
+pub use scrollable::Scrollable;
+pub use text_input::TextInput;
+
+use crate::widget::Id;
+
+use std::any::Any;
+use std::fmt;
+use std::rc::Rc;
+
+/// 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> {
+    /// Operates on a widget that contains other widgets.
+    ///
+    /// The `operate_on_children` function can be called to return control to
+    /// the widget tree and keep traversing it.
+    fn container(
+        &mut self,
+        id: Option<&Id>,
+        operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
+    );
+
+    /// Operates on a widget that can be focused.
+    fn focusable(&mut self, _state: &mut dyn Focusable, _id: Option<&Id>) {}
+
+    /// Operates on a widget that can be scrolled.
+    fn scrollable(&mut self, _state: &mut dyn Scrollable, _id: Option<&Id>) {}
+
+    /// Operates on a widget that has text input.
+    fn text_input(&mut self, _state: &mut dyn TextInput, _id: Option<&Id>) {}
+
+    /// Operates on a custom widget with some state.
+    fn custom(&mut self, _state: &mut dyn Any, _id: Option<&Id>) {}
+
+    /// Finishes the [`Operation`] and returns its [`Outcome`].
+    fn finish(&self) -> Outcome<T> {
+        Outcome::None
+    }
+}
+
+/// The result of an [`Operation`].
+pub enum Outcome<T> {
+    /// The [`Operation`] produced no result.
+    None,
+
+    /// The [`Operation`] produced some result.
+    Some(T),
+
+    /// The [`Operation`] needs to be followed by another [`Operation`].
+    Chain(Box<dyn Operation<T>>),
+}
+
+impl<T> fmt::Debug for Outcome<T>
+where
+    T: fmt::Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::None => write!(f, "Outcome::None"),
+            Self::Some(output) => write!(f, "Outcome::Some({output:?})"),
+            Self::Chain(_) => write!(f, "Outcome::Chain(...)"),
+        }
+    }
+}
+
+/// 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,
+) -> impl Operation<B>
+where
+    A: 'static,
+    B: 'static,
+{
+    #[allow(missing_debug_implementations)]
+    struct Map<A, B> {
+        operation: Box<dyn Operation<A>>,
+        f: Rc<dyn Fn(A) -> B>,
+    }
+
+    impl<A, B> Operation<B> for Map<A, B>
+    where
+        A: 'static,
+        B: 'static,
+    {
+        fn container(
+            &mut self,
+            id: Option<&Id>,
+            operate_on_children: &mut dyn FnMut(&mut dyn Operation<B>),
+        ) {
+            struct MapRef<'a, A> {
+                operation: &'a mut dyn Operation<A>,
+            }
+
+            impl<'a, A, B> Operation<B> for MapRef<'a, A> {
+                fn container(
+                    &mut self,
+                    id: Option<&Id>,
+                    operate_on_children: &mut dyn FnMut(&mut dyn Operation<B>),
+                ) {
+                    let Self { operation, .. } = self;
+
+                    operation.container(id, &mut |operation| {
+                        operate_on_children(&mut MapRef { operation });
+                    });
+                }
+
+                fn scrollable(
+                    &mut self,
+                    state: &mut dyn Scrollable,
+                    id: Option<&Id>,
+                ) {
+                    self.operation.scrollable(state, id);
+                }
+
+                fn focusable(
+                    &mut self,
+                    state: &mut dyn Focusable,
+                    id: Option<&Id>,
+                ) {
+                    self.operation.focusable(state, id);
+                }
+
+                fn text_input(
+                    &mut self,
+                    state: &mut dyn TextInput,
+                    id: Option<&Id>,
+                ) {
+                    self.operation.text_input(state, id);
+                }
+
+                fn custom(&mut self, state: &mut dyn Any, id: Option<&Id>) {
+                    self.operation.custom(state, id);
+                }
+            }
+
+            let Self { operation, .. } = self;
+
+            MapRef {
+                operation: operation.as_mut(),
+            }
+            .container(id, operate_on_children);
+        }
+
+        fn focusable(&mut self, state: &mut dyn Focusable, id: Option<&Id>) {
+            self.operation.focusable(state, id);
+        }
+
+        fn scrollable(&mut self, state: &mut dyn Scrollable, id: Option<&Id>) {
+            self.operation.scrollable(state, id);
+        }
+
+        fn text_input(&mut self, state: &mut dyn TextInput, id: Option<&Id>) {
+            self.operation.text_input(state, id);
+        }
+
+        fn custom(&mut self, state: &mut dyn Any, id: Option<&Id>) {
+            self.operation.custom(state, id);
+        }
+
+        fn finish(&self) -> Outcome<B> {
+            match self.operation.finish() {
+                Outcome::None => Outcome::None,
+                Outcome::Some(output) => Outcome::Some((self.f)(output)),
+                Outcome::Chain(next) => Outcome::Chain(Box::new(Map {
+                    operation: next,
+                    f: self.f.clone(),
+                })),
+            }
+        }
+    }
+
+    Map {
+        operation,
+        f: Rc::new(f),
+    }
+}
+
+/// Produces an [`Operation`] that applies the given [`Operation`] to the
+/// children of a container with the given [`Id`].
+pub fn scope<T: 'static>(
+    target: Id,
+    operation: impl Operation<T> + 'static,
+) -> impl Operation<T> {
+    struct ScopedOperation<Message> {
+        target: Id,
+        operation: Box<dyn Operation<Message>>,
+    }
+
+    impl<Message: 'static> Operation<Message> for ScopedOperation<Message> {
+        fn container(
+            &mut self,
+            id: Option<&Id>,
+            operate_on_children: &mut dyn FnMut(&mut dyn Operation<Message>),
+        ) {
+            if id == Some(&self.target) {
+                operate_on_children(self.operation.as_mut());
+            } else {
+                operate_on_children(self);
+            }
+        }
+
+        fn finish(&self) -> Outcome<Message> {
+            match self.operation.finish() {
+                Outcome::Chain(next) => {
+                    Outcome::Chain(Box::new(ScopedOperation {
+                        target: self.target.clone(),
+                        operation: next,
+                    }))
+                }
+                outcome => outcome,
+            }
+        }
+    }
+
+    ScopedOperation {
+        target,
+        operation: Box::new(operation),
+    }
+}
diff --git a/native/src/widget/operation/focusable.rs b/core/src/widget/operation/focusable.rs
index 312e4894..312e4894 100644
--- a/native/src/widget/operation/focusable.rs
+++ b/core/src/widget/operation/focusable.rs
diff --git a/native/src/widget/operation/scrollable.rs b/core/src/widget/operation/scrollable.rs
index 3b20631f..f947344d 100644
--- a/native/src/widget/operation/scrollable.rs
+++ b/core/src/widget/operation/scrollable.rs
@@ -5,6 +5,9 @@ use crate::widget::{Id, Operation};
 pub trait Scrollable {
     /// Snaps the scroll of the widget to the given `percentage` along the horizontal & vertical axis.
     fn snap_to(&mut self, offset: RelativeOffset);
+
+    /// Scroll the widget to the given [`AbsoluteOffset`] along the horizontal & vertical axis.
+    fn scroll_to(&mut self, offset: AbsoluteOffset);
 }
 
 /// Produces an [`Operation`] that snaps the widget with the given [`Id`] to
@@ -34,7 +37,43 @@ pub fn snap_to<T>(target: Id, offset: RelativeOffset) -> impl Operation<T> {
     SnapTo { target, offset }
 }
 
-/// The amount of offset in each direction of a [`Scrollable`].
+/// Produces an [`Operation`] that scrolls the widget with the given [`Id`] to
+/// the provided [`AbsoluteOffset`].
+pub fn scroll_to<T>(target: Id, offset: AbsoluteOffset) -> impl Operation<T> {
+    struct ScrollTo {
+        target: Id,
+        offset: AbsoluteOffset,
+    }
+
+    impl<T> Operation<T> for ScrollTo {
+        fn container(
+            &mut self,
+            _id: Option<&Id>,
+            operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
+        ) {
+            operate_on_children(self)
+        }
+
+        fn scrollable(&mut self, state: &mut dyn Scrollable, id: Option<&Id>) {
+            if Some(&self.target) == id {
+                state.scroll_to(self.offset);
+            }
+        }
+    }
+
+    ScrollTo { target, offset }
+}
+
+/// The amount of absolute offset in each direction of a [`Scrollable`].
+#[derive(Debug, Clone, Copy, PartialEq, Default)]
+pub struct AbsoluteOffset {
+    /// The amount of horizontal offset
+    pub x: f32,
+    /// The amount of vertical offset
+    pub y: f32,
+}
+
+/// The amount of relative offset in each direction of a [`Scrollable`].
 ///
 /// A value of `0.0` means start, while `1.0` means end.
 #[derive(Debug, Clone, Copy, PartialEq, Default)]
diff --git a/native/src/widget/operation/text_input.rs b/core/src/widget/operation/text_input.rs
index 4c773e99..4c773e99 100644
--- a/native/src/widget/operation/text_input.rs
+++ b/core/src/widget/operation/text_input.rs
diff --git a/native/src/widget/text.rs b/core/src/widget/text.rs
index 3fee48f2..79df2b02 100644
--- a/native/src/widget/text.rs
+++ b/core/src/widget/text.rs
@@ -1,30 +1,17 @@
 //! Write some text for your users to read.
 use crate::alignment;
 use crate::layout;
+use crate::mouse;
 use crate::renderer;
 use crate::text;
 use crate::widget::Tree;
-use crate::{Element, Layout, Length, Pixels, Point, Rectangle, Size, Widget};
+use crate::{Color, Element, Layout, Length, Pixels, Rectangle, Widget};
 
 use std::borrow::Cow;
 
-pub use iced_style::text::{Appearance, StyleSheet};
+pub use text::{LineHeight, Shaping};
 
 /// A paragraph of text.
-///
-/// # Example
-///
-/// ```
-/// # use iced_native::Color;
-/// #
-/// # type Text<'a> = iced_native::widget::Text<'a, iced_native::renderer::Null>;
-/// #
-/// Text::new("I <3 iced!")
-///     .size(40)
-///     .style(Color::from([0.0, 0.0, 1.0]));
-/// ```
-///
-/// ![Text drawn by `iced_wgpu`](https://github.com/iced-rs/iced/blob/7760618fb112074bc40b148944521f312152012a/docs/images/text.png?raw=true)
 #[allow(missing_debug_implementations)]
 pub struct Text<'a, Renderer>
 where
@@ -33,11 +20,13 @@ where
 {
     content: Cow<'a, str>,
     size: Option<f32>,
+    line_height: LineHeight,
     width: Length,
     height: Length,
     horizontal_alignment: alignment::Horizontal,
     vertical_alignment: alignment::Vertical,
-    font: Renderer::Font,
+    font: Option<Renderer::Font>,
+    shaping: Shaping,
     style: <Renderer::Theme as StyleSheet>::Style,
 }
 
@@ -51,11 +40,13 @@ where
         Text {
             content: content.into(),
             size: None,
-            font: Default::default(),
+            line_height: LineHeight::default(),
+            font: None,
             width: Length::Shrink,
             height: Length::Shrink,
             horizontal_alignment: alignment::Horizontal::Left,
             vertical_alignment: alignment::Vertical::Top,
+            shaping: Shaping::Basic,
             style: Default::default(),
         }
     }
@@ -66,11 +57,17 @@ where
         self
     }
 
+    /// Sets the [`LineHeight`] of the [`Text`].
+    pub fn line_height(mut self, line_height: impl Into<LineHeight>) -> Self {
+        self.line_height = line_height.into();
+        self
+    }
+
     /// Sets the [`Font`] of the [`Text`].
     ///
     /// [`Font`]: crate::text::Renderer::Font
     pub fn font(mut self, font: impl Into<Renderer::Font>) -> Self {
-        self.font = font.into();
+        self.font = Some(font.into());
         self
     }
 
@@ -112,6 +109,12 @@ where
         self.vertical_alignment = alignment;
         self
     }
+
+    /// Sets the [`Shaping`] strategy of the [`Text`].
+    pub fn shaping(mut self, shaping: Shaping) -> Self {
+        self.shaping = shaping;
+        self
+    }
 }
 
 impl<'a, Message, Renderer> Widget<Message, Renderer> for Text<'a, Renderer>
@@ -136,12 +139,16 @@ where
 
         let size = self.size.unwrap_or_else(|| renderer.default_size());
 
-        let bounds = limits.max();
-
-        let (width, height) =
-            renderer.measure(&self.content, size, self.font.clone(), bounds);
+        let bounds = renderer.measure(
+            &self.content,
+            size,
+            self.line_height,
+            self.font.unwrap_or_else(|| renderer.default_font()),
+            limits.max(),
+            self.shaping,
+        );
 
-        let size = limits.resolve(Size::new(width, height));
+        let size = limits.resolve(bounds);
 
         layout::Node::new(size)
     }
@@ -153,7 +160,7 @@ where
         theme: &Renderer::Theme,
         style: &renderer::Style,
         layout: Layout<'_>,
-        _cursor_position: Point,
+        _cursor_position: mouse::Cursor,
         _viewport: &Rectangle,
     ) {
         draw(
@@ -162,10 +169,12 @@ where
             layout,
             &self.content,
             self.size,
-            self.font.clone(),
-            theme.appearance(self.style),
+            self.line_height,
+            self.font,
+            theme.appearance(self.style.clone()),
             self.horizontal_alignment,
             self.vertical_alignment,
+            self.shaping,
         );
     }
 }
@@ -186,10 +195,12 @@ pub fn draw<Renderer>(
     layout: Layout<'_>,
     content: &str,
     size: Option<f32>,
-    font: Renderer::Font,
+    line_height: LineHeight,
+    font: Option<Renderer::Font>,
     appearance: Appearance,
     horizontal_alignment: alignment::Horizontal,
     vertical_alignment: alignment::Vertical,
+    shaping: Shaping,
 ) where
     Renderer: text::Renderer,
 {
@@ -207,14 +218,18 @@ pub fn draw<Renderer>(
         alignment::Vertical::Bottom => bounds.y + bounds.height,
     };
 
-    renderer.fill_text(crate::text::Text {
+    let size = size.unwrap_or_else(|| renderer.default_size());
+
+    renderer.fill_text(crate::Text {
         content,
-        size: size.unwrap_or_else(|| renderer.default_size()),
+        size,
+        line_height,
         bounds: Rectangle { x, y, ..bounds },
         color: appearance.color.unwrap_or(style.text_color),
-        font,
+        font: font.unwrap_or_else(|| renderer.default_font()),
         horizontal_alignment,
         vertical_alignment,
+        shaping,
     });
 }
 
@@ -238,22 +253,52 @@ where
         Self {
             content: self.content.clone(),
             size: self.size,
+            line_height: self.line_height,
             width: self.width,
             height: self.height,
             horizontal_alignment: self.horizontal_alignment,
             vertical_alignment: self.vertical_alignment,
-            font: self.font.clone(),
-            style: self.style,
+            font: self.font,
+            style: self.style.clone(),
+            shaping: self.shaping,
         }
     }
 }
 
+impl<'a, Renderer> From<&'a str> for Text<'a, Renderer>
+where
+    Renderer: text::Renderer,
+    Renderer::Theme: StyleSheet,
+{
+    fn from(content: &'a str) -> Self {
+        Self::new(content)
+    }
+}
+
 impl<'a, Message, Renderer> From<&'a str> for Element<'a, Message, Renderer>
 where
     Renderer: text::Renderer + 'a,
     Renderer::Theme: StyleSheet,
 {
-    fn from(contents: &'a str) -> Self {
-        Text::new(contents).into()
+    fn from(content: &'a str) -> Self {
+        Text::from(content).into()
     }
 }
+
+/// The style sheet of some text.
+pub trait StyleSheet {
+    /// The supported style of the [`StyleSheet`].
+    type Style: Default + Clone;
+
+    /// Produces the [`Appearance`] of some text.
+    fn appearance(&self, style: Self::Style) -> Appearance;
+}
+
+/// The apperance of some text.
+#[derive(Debug, Clone, Copy, Default)]
+pub struct Appearance {
+    /// The [`Color`] of the text.
+    ///
+    /// The default, `None`, means using the inherited color.
+    pub color: Option<Color>,
+}
diff --git a/native/src/widget/tree.rs b/core/src/widget/tree.rs
index da269632..da269632 100644
--- a/native/src/widget/tree.rs
+++ b/core/src/widget/tree.rs
diff --git a/core/src/window.rs b/core/src/window.rs
new file mode 100644
index 00000000..a6dbdfb4
--- /dev/null
+++ b/core/src/window.rs
@@ -0,0 +1,15 @@
+//! Build window-based GUI applications.
+pub mod icon;
+
+mod event;
+mod level;
+mod mode;
+mod redraw_request;
+mod user_attention;
+
+pub use event::Event;
+pub use icon::Icon;
+pub use level::Level;
+pub use mode::Mode;
+pub use redraw_request::RedrawRequest;
+pub use user_attention::UserAttention;
diff --git a/native/src/window/event.rs b/core/src/window/event.rs
index e2fb5e66..e2fb5e66 100644
--- a/native/src/window/event.rs
+++ b/core/src/window/event.rs
diff --git a/core/src/window/icon.rs b/core/src/window/icon.rs
new file mode 100644
index 00000000..31868ecf
--- /dev/null
+++ b/core/src/window/icon.rs
@@ -0,0 +1,80 @@
+//! Change the icon of a window.
+use crate::Size;
+
+use std::mem;
+
+/// Builds an  [`Icon`] from its RGBA pixels in the sRGB color space.
+pub fn from_rgba(
+    rgba: Vec<u8>,
+    width: u32,
+    height: u32,
+) -> Result<Icon, Error> {
+    const PIXEL_SIZE: usize = mem::size_of::<u8>() * 4;
+
+    if rgba.len() % PIXEL_SIZE != 0 {
+        return Err(Error::ByteCountNotDivisibleBy4 {
+            byte_count: rgba.len(),
+        });
+    }
+
+    let pixel_count = rgba.len() / PIXEL_SIZE;
+
+    if pixel_count != (width * height) as usize {
+        return Err(Error::DimensionsVsPixelCount {
+            width,
+            height,
+            width_x_height: (width * height) as usize,
+            pixel_count,
+        });
+    }
+
+    Ok(Icon {
+        rgba,
+        size: Size::new(width, height),
+    })
+}
+
+/// An window icon normally used for the titlebar or taskbar.
+#[derive(Debug, Clone)]
+pub struct Icon {
+    rgba: Vec<u8>,
+    size: Size<u32>,
+}
+
+impl Icon {
+    /// Returns the raw data of the [`Icon`].
+    pub fn into_raw(self) -> (Vec<u8>, Size<u32>) {
+        (self.rgba, self.size)
+    }
+}
+
+#[derive(Debug, thiserror::Error)]
+/// An error produced when using [`Icon::from_rgba`] with invalid arguments.
+pub enum Error {
+    /// Produced when the length of the `rgba` argument isn't divisible by 4, thus `rgba` can't be
+    /// safely interpreted as 32bpp RGBA pixels.
+    #[error(
+        "The provided RGBA data (with length {byte_count}) isn't divisible \
+        by 4. Therefore, it cannot be safely interpreted as 32bpp RGBA pixels"
+    )]
+    ByteCountNotDivisibleBy4 {
+        /// The length of the provided RGBA data.
+        byte_count: usize,
+    },
+    /// Produced when the number of pixels (`rgba.len() / 4`) isn't equal to `width * height`.
+    /// At least one of your arguments is incorrect.
+    #[error(
+        "The number of RGBA pixels ({pixel_count}) does not match the \
+        provided dimensions ({width}x{height})."
+    )]
+    DimensionsVsPixelCount {
+        /// The provided width.
+        width: u32,
+        /// The provided height.
+        height: u32,
+        /// The product of `width` and `height`.
+        width_x_height: usize,
+        /// The amount of pixels of the provided RGBA data.
+        pixel_count: usize,
+    },
+}
diff --git a/native/src/window/id.rs b/core/src/window/id.rs
index 0a11b1aa..0a11b1aa 100644
--- a/native/src/window/id.rs
+++ b/core/src/window/id.rs
diff --git a/core/src/window/level.rs b/core/src/window/level.rs
new file mode 100644
index 00000000..3878ecac
--- /dev/null
+++ b/core/src/window/level.rs
@@ -0,0 +1,19 @@
+/// A window level groups windows with respect to their z-position.
+///
+/// The relative ordering between windows in different window levels is fixed.
+/// The z-order of a window within the same window level may change dynamically
+/// on user interaction.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+pub enum Level {
+    /// The default behavior.
+    #[default]
+    Normal,
+
+    /// The window will always be below normal windows.
+    ///
+    /// This is useful for a widget-based app.
+    AlwaysOnBottom,
+
+    /// The window will always be on top of normal windows.
+    AlwaysOnTop,
+}
diff --git a/native/src/window/mode.rs b/core/src/window/mode.rs
index fdce8e23..fdce8e23 100644
--- a/native/src/window/mode.rs
+++ b/core/src/window/mode.rs
diff --git a/core/src/window/position.rs b/core/src/window/position.rs
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/core/src/window/position.rs
diff --git a/native/src/window/redraw_request.rs b/core/src/window/redraw_request.rs
index 3b4f0fd3..3b4f0fd3 100644
--- a/native/src/window/redraw_request.rs
+++ b/core/src/window/redraw_request.rs
diff --git a/native/src/window/settings.rs b/core/src/window/settings.rs
index 67798fbe..458b9232 100644
--- a/native/src/window/settings.rs
+++ b/core/src/window/settings.rs
@@ -1,4 +1,6 @@
-use crate::window::{Icon, Position};
+use crate::window::{Icon, Level, Position};
+
+pub use iced_winit::settings::PlatformSpecific;
 
 /// The window settings of an application.
 #[derive(Debug, Clone)]
@@ -27,11 +29,14 @@ pub struct Settings {
     /// Whether the window should be transparent.
     pub transparent: bool,
 
-    /// Whether the window will always be on top of other windows.
-    pub always_on_top: bool,
+    /// The window [`Level`].
+    pub level: Level,
 
     /// The icon of the window.
     pub icon: Option<Icon>,
+
+    /// Platform specific settings.
+    pub platform_specific: PlatformSpecific,
 }
 
 impl Default for Settings {
@@ -45,8 +50,27 @@ impl Default for Settings {
             resizable: true,
             decorations: true,
             transparent: false,
-            always_on_top: false,
+            level: Level::default(),
             icon: None,
+            platform_specific: Default::default(),
+        }
+    }
+}
+
+impl From<Settings> for iced_winit::settings::Window {
+    fn from(settings: Settings) -> Self {
+        Self {
+            size: settings.size,
+            position: iced_winit::Position::from(settings.position),
+            min_size: settings.min_size,
+            max_size: settings.max_size,
+            visible: settings.visible,
+            resizable: settings.resizable,
+            decorations: settings.decorations,
+            transparent: settings.transparent,
+            level: settings.level,
+            icon: settings.icon.map(Icon::into),
+            platform_specific: settings.platform_specific,
         }
     }
 }
diff --git a/native/src/window/user_attention.rs b/core/src/window/user_attention.rs
index b03dfeef..b03dfeef 100644
--- a/native/src/window/user_attention.rs
+++ b/core/src/window/user_attention.rs