Merge branch 'master' into feat/multi-window-support

36 files changed, 1035 insertions, 281 deletions

diff --git a/core/Cargo.toml b/core/Cargo.toml
index edf9e7c8..7db4fa53 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -1,24 +1,27 @@
 [package]
 name = "iced_core"
-version = "0.9.0"
-authors = ["Héctor Ramón Jiménez <hector0193@gmail.com>"]
-edition = "2021"
-description = "The essential concepts of Iced"
-license = "MIT"
-repository = "https://github.com/iced-rs/iced"
+description = "The essential ideas of iced"
+version.workspace = true
+edition.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+homepage.workspace = true
+categories.workspace = true
+keywords.workspace = true
 
 [dependencies]
-bitflags = "1.2"
-thiserror = "1"
-log = "0.4.17"
-twox-hash = { version = "1.5", default-features = false }
+bitflags.workspace = true
+log.workspace = true
+thiserror.workspace = true
+xxhash-rust.workspace = true
+num-traits.workspace = true
 
-[dependencies.palette]
-version = "0.7"
-optional = true
+palette.workspace = true
+palette.optional = true
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
-instant = "0.1"
+instant.workspace = true
 
 [target.'cfg(windows)'.dependencies.raw-window-handle]
 version = "0.5.2"
diff --git a/core/src/angle.rs b/core/src/angle.rs
index 75a57c76..102b69cf 100644
--- a/core/src/angle.rs
+++ b/core/src/angle.rs
@@ -1,32 +1,72 @@
 use crate::{Point, Rectangle, Vector};
-use std::f32::consts::PI;
 
-#[derive(Debug, Copy, Clone, PartialEq)]
+use std::f32::consts::{FRAC_PI_2, PI};
+use std::ops::RangeInclusive;
+
 /// Degrees
+#[derive(Debug, Copy, Clone, PartialEq, PartialOrd)]
 pub struct Degrees(pub f32);
 
-#[derive(Debug, Copy, Clone, PartialEq)]
 /// Radians
+#[derive(Debug, Copy, Clone, PartialEq, PartialOrd)]
 pub struct Radians(pub f32);
 
+impl Radians {
+    /// The range of radians of a circle.
+    pub const RANGE: RangeInclusive<Radians> = Radians(0.0)..=Radians(2.0 * PI);
+}
+
 impl From<Degrees> for Radians {
     fn from(degrees: Degrees) -> Self {
-        Radians(degrees.0 * PI / 180.0)
+        Self(degrees.0 * PI / 180.0)
+    }
+}
+
+impl From<f32> for Radians {
+    fn from(radians: f32) -> Self {
+        Self(radians)
+    }
+}
+
+impl From<u8> for Radians {
+    fn from(radians: u8) -> Self {
+        Self(f32::from(radians))
+    }
+}
+
+impl From<Radians> for f64 {
+    fn from(radians: Radians) -> Self {
+        Self::from(radians.0)
+    }
+}
+
+impl num_traits::FromPrimitive for Radians {
+    fn from_i64(n: i64) -> Option<Self> {
+        Some(Self(n as f32))
+    }
+
+    fn from_u64(n: u64) -> Option<Self> {
+        Some(Self(n as f32))
+    }
+
+    fn from_f64(n: f64) -> Option<Self> {
+        Some(Self(n as f32))
     }
 }
 
 impl Radians {
-    /// Calculates the line in which the [`Angle`] intercepts the `bounds`.
+    /// 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 angle = self.0 - FRAC_PI_2;
+        let r = Vector::new(f32::cos(angle), f32::sin(angle));
 
-        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 distance_to_rect = f32::max(
+            f32::abs(r.x * bounds.width / 2.0),
+            f32::abs(r.y * bounds.height / 2.0),
         );
 
-        let start = bounds.center() + v1 * distance_to_rect;
-        let end = bounds.center() - v1 * distance_to_rect;
+        let start = bounds.center() - r * distance_to_rect;
+        let end = bounds.center() + r * distance_to_rect;
 
         (start, end)
     }
diff --git a/core/src/color.rs b/core/src/color.rs
index 1392f28b..13077628 100644
--- a/core/src/color.rs
+++ b/core/src/color.rs
@@ -1,7 +1,7 @@
 #[cfg(feature = "palette")]
 use palette::rgb::{Srgb, Srgba};
 
-/// A color in the sRGB color space.
+/// A color in the `sRGB` color space.
 #[derive(Debug, Clone, Copy, PartialEq, Default)]
 pub struct Color {
     /// Red component, 0.0 - 1.0
@@ -89,6 +89,26 @@ impl Color {
         }
     }
 
+    /// Creates a [`Color`] from its linear RGBA components.
+    pub fn from_linear_rgba(r: f32, g: f32, b: f32, a: f32) -> Self {
+        // As described in:
+        // https://en.wikipedia.org/wiki/SRGB
+        fn gamma_component(u: f32) -> f32 {
+            if u < 0.0031308 {
+                12.92 * u
+            } else {
+                1.055 * u.powf(1.0 / 2.4) - 0.055
+            }
+        }
+
+        Self {
+            r: gamma_component(r),
+            g: gamma_component(g),
+            b: gamma_component(b),
+            a,
+        }
+    }
+
     /// Converts the [`Color`] into its RGBA8 equivalent.
     #[must_use]
     pub fn into_rgba8(self) -> [u8; 4] {
diff --git a/core/src/element.rs b/core/src/element.rs
index 3268f14b..dea111af 100644
--- a/core/src/element.rs
+++ b/core/src/element.rs
@@ -5,7 +5,9 @@ use crate::overlay;
 use crate::renderer;
 use crate::widget;
 use crate::widget::tree::{self, Tree};
-use crate::{Clipboard, Color, Layout, Length, Rectangle, Shell, Widget};
+use crate::{
+    Clipboard, Color, Layout, Length, Rectangle, Shell, Vector, Widget,
+};
 
 use std::any::Any;
 use std::borrow::Borrow;
@@ -291,7 +293,7 @@ where
     }
 
     fn diff(&self, tree: &mut Tree) {
-        self.widget.diff(tree)
+        self.widget.diff(tree);
     }
 
     fn width(&self) -> Length {
@@ -304,10 +306,11 @@ where
 
     fn layout(
         &self,
+        tree: &mut Tree,
         renderer: &Renderer,
         limits: &layout::Limits,
     ) -> layout::Node {
-        self.widget.layout(renderer, limits)
+        self.widget.layout(tree, renderer, limits)
     }
 
     fn operate(
@@ -325,11 +328,12 @@ where
             fn container(
                 &mut self,
                 id: Option<&widget::Id>,
+                bounds: Rectangle,
                 operate_on_children: &mut dyn FnMut(
                     &mut dyn widget::Operation<T>,
                 ),
             ) {
-                self.operation.container(id, &mut |operation| {
+                self.operation.container(id, bounds, &mut |operation| {
                     operate_on_children(&mut MapOperation { operation });
                 });
             }
@@ -346,8 +350,10 @@ where
                 &mut self,
                 state: &mut dyn widget::operation::Scrollable,
                 id: Option<&widget::Id>,
+                bounds: Rectangle,
+                translation: Vector,
             ) {
-                self.operation.scrollable(state, id);
+                self.operation.scrollable(state, id, bounds, translation);
             }
 
             fn text_input(
@@ -380,6 +386,7 @@ where
         renderer: &Renderer,
         clipboard: &mut dyn Clipboard,
         shell: &mut Shell<'_, B>,
+        viewport: &Rectangle,
     ) -> event::Status {
         let mut local_messages = Vec::new();
         let mut local_shell = Shell::new(&mut local_messages);
@@ -392,6 +399,7 @@ where
             renderer,
             clipboard,
             &mut local_shell,
+            viewport,
         );
 
         shell.merge(local_shell, &self.mapper);
@@ -410,7 +418,7 @@ where
         viewport: &Rectangle,
     ) {
         self.widget
-            .draw(tree, renderer, theme, style, layout, cursor, viewport)
+            .draw(tree, renderer, theme, style, layout, cursor, viewport);
     }
 
     fn mouse_interaction(
@@ -484,10 +492,11 @@ where
 
     fn layout(
         &self,
+        tree: &mut Tree,
         renderer: &Renderer,
         limits: &layout::Limits,
     ) -> layout::Node {
-        self.element.widget.layout(renderer, limits)
+        self.element.widget.layout(tree, renderer, limits)
     }
 
     fn operate(
@@ -499,7 +508,7 @@ where
     ) {
         self.element
             .widget
-            .operate(state, layout, renderer, operation)
+            .operate(state, layout, renderer, operation);
     }
 
     fn on_event(
@@ -511,10 +520,11 @@ where
         renderer: &Renderer,
         clipboard: &mut dyn Clipboard,
         shell: &mut Shell<'_, Message>,
+        viewport: &Rectangle,
     ) -> event::Status {
-        self.element
-            .widget
-            .on_event(state, event, layout, cursor, renderer, clipboard, shell)
+        self.element.widget.on_event(
+            state, event, layout, cursor, renderer, clipboard, shell, viewport,
+        )
     }
 
     fn draw(
diff --git a/core/src/font.rs b/core/src/font.rs
index bb425fd6..2b68decf 100644
--- a/core/src/font.rs
+++ b/core/src/font.rs
@@ -10,8 +10,8 @@ pub struct Font {
     pub weight: Weight,
     /// The [`Stretch`] of the [`Font`].
     pub stretch: Stretch,
-    /// Whether if the [`Font`] is monospaced or not.
-    pub monospaced: bool,
+    /// The [`Style`] of the [`Font`].
+    pub style: Style,
 }
 
 impl Font {
@@ -20,13 +20,12 @@ impl Font {
         family: Family::SansSerif,
         weight: Weight::Normal,
         stretch: Stretch::Normal,
-        monospaced: false,
+        style: Style::Normal,
     };
 
     /// A monospaced font with normal [`Weight`].
     pub const MONOSPACE: Font = Font {
         family: Family::Monospace,
-        monospaced: true,
         ..Self::DEFAULT
     };
 
@@ -100,3 +99,13 @@ pub enum Stretch {
     ExtraExpanded,
     UltraExpanded,
 }
+
+/// The style of some text.
+#[allow(missing_docs)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
+pub enum Style {
+    #[default]
+    Normal,
+    Italic,
+    Oblique,
+}
diff --git a/core/src/gradient.rs b/core/src/gradient.rs
index e19622fb..4711b044 100644
--- a/core/src/gradient.rs
+++ b/core/src/gradient.rs
@@ -6,10 +6,8 @@ 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`].
+    /// A linear gradient interpolates colors along a direction at a specific angle.
     Linear(Linear),
 }
 
@@ -96,8 +94,8 @@ impl Linear {
         mut self,
         stops: impl IntoIterator<Item = ColorStop>,
     ) -> Self {
-        for stop in stops.into_iter() {
-            self = self.add_stop(stop.offset, stop.color)
+        for stop in stops {
+            self = self.add_stop(stop.offset, stop.color);
         }
 
         self
diff --git a/core/src/hasher.rs b/core/src/hasher.rs
index fa52f16d..a13d78af 100644
--- a/core/src/hasher.rs
+++ b/core/src/hasher.rs
@@ -1,10 +1,11 @@
 /// The hasher used to compare layouts.
-#[derive(Debug, Default)]
-pub struct Hasher(twox_hash::XxHash64);
+#[allow(missing_debug_implementations)] // Doesn't really make sense to have debug on the hasher state anyways.
+#[derive(Default)]
+pub struct Hasher(xxhash_rust::xxh3::Xxh3);
 
 impl core::hash::Hasher for Hasher {
     fn write(&mut self, bytes: &[u8]) {
-        self.0.write(bytes)
+        self.0.write(bytes);
     }
 
     fn finish(&self) -> u64 {
diff --git a/core/src/image.rs b/core/src/image.rs
index 85d9d475..e9675316 100644
--- a/core/src/image.rs
+++ b/core/src/image.rs
@@ -164,6 +164,16 @@ impl std::fmt::Debug for Data {
     }
 }
 
+/// Image filtering strategy.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
+pub enum FilterMethod {
+    /// Bilinear interpolation.
+    #[default]
+    Linear,
+    /// Nearest neighbor.
+    Nearest,
+}
+
 /// A [`Renderer`] that can render raster graphics.
 ///
 /// [renderer]: crate::renderer
@@ -178,5 +188,10 @@ pub trait Renderer: crate::Renderer {
 
     /// Draws an image with the given [`Handle`] and inside the provided
     /// `bounds`.
-    fn draw(&mut self, handle: Self::Handle, bounds: Rectangle);
+    fn draw(
+        &mut self,
+        handle: Self::Handle,
+        filter_method: FilterMethod,
+        bounds: Rectangle,
+    );
 }
diff --git a/core/src/layout.rs b/core/src/layout.rs
index 04954fb9..caf315b6 100644
--- a/core/src/layout.rs
+++ b/core/src/layout.rs
@@ -7,7 +7,7 @@ pub mod flex;
 pub use limits::Limits;
 pub use node::Node;
 
-use crate::{Point, Rectangle, Vector};
+use crate::{Point, Rectangle, Size, Vector};
 
 /// The bounds of a [`Node`] and its children, using absolute coordinates.
 #[derive(Debug, Clone, Copy)]
@@ -63,3 +63,36 @@ impl<'a> Layout<'a> {
         })
     }
 }
+
+/// Produces a [`Node`] with two children nodes one right next to each other.
+pub fn next_to_each_other(
+    limits: &Limits,
+    spacing: f32,
+    left: impl FnOnce(&Limits) -> Node,
+    right: impl FnOnce(&Limits) -> Node,
+) -> Node {
+    let mut left_node = left(limits);
+    let left_size = left_node.size();
+
+    let right_limits = limits.shrink(Size::new(left_size.width + spacing, 0.0));
+
+    let mut right_node = right(&right_limits);
+    let right_size = right_node.size();
+
+    let (left_y, right_y) = if left_size.height > right_size.height {
+        (0.0, (left_size.height - right_size.height) / 2.0)
+    } else {
+        ((right_size.height - left_size.height) / 2.0, 0.0)
+    };
+
+    left_node.move_to(Point::new(0.0, left_y));
+    right_node.move_to(Point::new(left_size.width + spacing, right_y));
+
+    Node::with_children(
+        Size::new(
+            left_size.width + spacing + right_size.width,
+            left_size.height.max(right_size.height),
+        ),
+        vec![left_node, right_node],
+    )
+}
diff --git a/core/src/layout/flex.rs b/core/src/layout/flex.rs
index 8b967849..c02b63d8 100644
--- a/core/src/layout/flex.rs
+++ b/core/src/layout/flex.rs
@@ -19,6 +19,7 @@
 use crate::Element;
 
 use crate::layout::{Limits, Node};
+use crate::widget;
 use crate::{Alignment, Padding, Point, Size};
 
 /// The main axis of a flex layout.
@@ -66,6 +67,7 @@ pub fn resolve<Message, Renderer>(
     spacing: f32,
     align_items: Alignment,
     items: &[Element<'_, Message, Renderer>],
+    trees: &mut [widget::Tree],
 ) -> Node
 where
     Renderer: crate::Renderer,
@@ -81,7 +83,7 @@ where
     let mut nodes: Vec<Node> = Vec::with_capacity(items.len());
     nodes.resize(items.len(), Node::default());
 
-    for (i, child) in items.iter().enumerate() {
+    for (i, (child, tree)) in items.iter().zip(trees.iter_mut()).enumerate() {
         let fill_factor = match axis {
             Axis::Horizontal => child.as_widget().width(),
             Axis::Vertical => child.as_widget().height(),
@@ -94,7 +96,8 @@ where
             let child_limits =
                 Limits::new(Size::ZERO, Size::new(max_width, max_height));
 
-            let layout = child.as_widget().layout(renderer, &child_limits);
+            let layout =
+                child.as_widget().layout(tree, renderer, &child_limits);
             let size = layout.size();
 
             available -= axis.main(size);
@@ -108,7 +111,7 @@ where
 
     let remaining = available.max(0.0);
 
-    for (i, child) in items.iter().enumerate() {
+    for (i, (child, tree)) in items.iter().zip(trees).enumerate() {
         let fill_factor = match axis {
             Axis::Horizontal => child.as_widget().width(),
             Axis::Vertical => child.as_widget().height(),
@@ -133,7 +136,8 @@ where
                 Size::new(max_width, max_height),
             );
 
-            let layout = child.as_widget().layout(renderer, &child_limits);
+            let layout =
+                child.as_widget().layout(tree, renderer, &child_limits);
             cross = cross.max(axis.cross(layout.size()));
 
             nodes[i] = layout;
diff --git a/core/src/layout/limits.rs b/core/src/layout/limits.rs
index 5d3c1556..39a3d98b 100644
--- a/core/src/layout/limits.rs
+++ b/core/src/layout/limits.rs
@@ -2,7 +2,7 @@
 use crate::{Length, Padding, Size};
 
 /// A set of size constraints for layouting.
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, PartialEq)]
 pub struct Limits {
     min: Size,
     max: Size,
diff --git a/core/src/lib.rs b/core/src/lib.rs
index 76d775e7..54ea5839 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -1,29 +1,21 @@
 //! The core library of [Iced].
 //!
 //! This library holds basic types that can be reused and re-exported in
-//! different runtime implementations. For instance, both [`iced_native`] and
-//! [`iced_web`] are built on top of `iced_core`.
+//! different runtime implementations.
 //!
 //! ![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/0.9/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"
 )]
+#![forbid(unsafe_code, rust_2018_idioms)]
 #![deny(
     missing_debug_implementations,
     missing_docs,
     unused_results,
-    clippy::extra_unused_lifetimes,
-    clippy::from_over_into,
-    clippy::needless_borrow,
-    clippy::new_without_default,
-    clippy::useless_conversion
+    rustdoc::broken_intra_doc_links
 )]
-#![forbid(unsafe_code, rust_2018_idioms)]
-#![allow(clippy::inherent_to_string, clippy::type_complexity)]
 pub mod alignment;
 pub mod clipboard;
 pub mod event;
diff --git a/core/src/mouse/click.rs b/core/src/mouse/click.rs
index 4a7d796c..6f3844be 100644
--- a/core/src/mouse/click.rs
+++ b/core/src/mouse/click.rs
@@ -24,7 +24,7 @@ pub enum Kind {
 }
 
 impl Kind {
-    fn next(&self) -> Kind {
+    fn next(self) -> Kind {
         match self {
             Kind::Single => Kind::Double,
             Kind::Double => Kind::Triple,
@@ -61,6 +61,11 @@ impl Click {
         self.kind
     }
 
+    /// Returns the position of the [`Click`].
+    pub fn position(&self) -> Point {
+        self.position
+    }
+
     fn is_consecutive(&self, new_position: Point, time: Instant) -> bool {
         let duration = if time > self.time {
             Some(time - self.time)
diff --git a/core/src/overlay.rs b/core/src/overlay.rs
index 2e05db93..af10afee 100644
--- a/core/src/overlay.rs
+++ b/core/src/overlay.rs
@@ -11,7 +11,7 @@ use crate::mouse;
 use crate::renderer;
 use crate::widget;
 use crate::widget::Tree;
-use crate::{Clipboard, Layout, Point, Rectangle, Shell, Size};
+use crate::{Clipboard, Layout, Point, Rectangle, Shell, Size, Vector};
 
 /// An interactive component that can be displayed on top of other widgets.
 pub trait Overlay<Message, Renderer>
@@ -25,10 +25,11 @@ where
     ///
     /// [`Node`]: layout::Node
     fn layout(
-        &self,
+        &mut self,
         renderer: &Renderer,
         bounds: Size,
         position: Point,
+        translation: Vector,
     ) -> layout::Node;
 
     /// Draws the [`Overlay`] using the associated `Renderer`.
diff --git a/core/src/overlay/element.rs b/core/src/overlay/element.rs
index c2134343..a279fe28 100644
--- a/core/src/overlay/element.rs
+++ b/core/src/overlay/element.rs
@@ -13,6 +13,7 @@ use std::any::Any;
 #[allow(missing_debug_implementations)]
 pub struct Element<'a, Message, Renderer> {
     position: Point,
+    translation: Vector,
     overlay: Box<dyn Overlay<Message, Renderer> + 'a>,
 }
 
@@ -25,7 +26,11 @@ where
         position: Point,
         overlay: Box<dyn Overlay<Message, Renderer> + 'a>,
     ) -> Self {
-        Self { position, overlay }
+        Self {
+            position,
+            overlay,
+            translation: Vector::ZERO,
+        }
     }
 
     /// Returns the position of the [`Element`].
@@ -36,6 +41,7 @@ where
     /// Translates the [`Element`].
     pub fn translate(mut self, translation: Vector) -> Self {
         self.position = self.position + translation;
+        self.translation = self.translation + translation;
         self
     }
 
@@ -48,19 +54,24 @@ where
     {
         Element {
             position: self.position,
+            translation: self.translation,
             overlay: Box::new(Map::new(self.overlay, f)),
         }
     }
 
     /// Computes the layout of the [`Element`] in the given bounds.
     pub fn layout(
-        &self,
+        &mut self,
         renderer: &Renderer,
         bounds: Size,
         translation: Vector,
     ) -> layout::Node {
-        self.overlay
-            .layout(renderer, bounds, self.position + translation)
+        self.overlay.layout(
+            renderer,
+            bounds,
+            self.position + translation,
+            self.translation + translation,
+        )
     }
 
     /// Processes a runtime [`Event`].
@@ -98,7 +109,7 @@ where
         layout: Layout<'_>,
         cursor: mouse::Cursor,
     ) {
-        self.overlay.draw(renderer, theme, style, layout, cursor)
+        self.overlay.draw(renderer, theme, style, layout, cursor);
     }
 
     /// Applies a [`widget::Operation`] to the [`Element`].
@@ -150,12 +161,13 @@ where
     Renderer: crate::Renderer,
 {
     fn layout(
-        &self,
+        &mut self,
         renderer: &Renderer,
         bounds: Size,
         position: Point,
+        translation: Vector,
     ) -> layout::Node {
-        self.content.layout(renderer, bounds, position)
+        self.content.layout(renderer, bounds, position, translation)
     }
 
     fn operate(
@@ -172,11 +184,12 @@ where
             fn container(
                 &mut self,
                 id: Option<&widget::Id>,
+                bounds: Rectangle,
                 operate_on_children: &mut dyn FnMut(
                     &mut dyn widget::Operation<T>,
                 ),
             ) {
-                self.operation.container(id, &mut |operation| {
+                self.operation.container(id, bounds, &mut |operation| {
                     operate_on_children(&mut MapOperation { operation });
                 });
             }
@@ -193,8 +206,10 @@ where
                 &mut self,
                 state: &mut dyn widget::operation::Scrollable,
                 id: Option<&widget::Id>,
+                bounds: Rectangle,
+                translation: Vector,
             ) {
-                self.operation.scrollable(state, id);
+                self.operation.scrollable(state, id, bounds, translation);
             }
 
             fn text_input(
@@ -202,7 +217,7 @@ where
                 state: &mut dyn widget::operation::TextInput,
                 id: Option<&widget::Id>,
             ) {
-                self.operation.text_input(state, id)
+                self.operation.text_input(state, id);
             }
 
             fn custom(&mut self, state: &mut dyn Any, id: Option<&widget::Id>) {
@@ -259,7 +274,7 @@ where
         layout: Layout<'_>,
         cursor: mouse::Cursor,
     ) {
-        self.content.draw(renderer, theme, style, layout, cursor)
+        self.content.draw(renderer, theme, style, layout, cursor);
     }
 
     fn is_over(
diff --git a/core/src/overlay/group.rs b/core/src/overlay/group.rs
index deffaad0..e1e9727a 100644
--- a/core/src/overlay/group.rs
+++ b/core/src/overlay/group.rs
@@ -4,7 +4,9 @@ use crate::mouse;
 use crate::overlay;
 use crate::renderer;
 use crate::widget;
-use crate::{Clipboard, Event, Layout, Overlay, Point, Rectangle, Shell, Size};
+use crate::{
+    Clipboard, Event, Layout, Overlay, Point, Rectangle, Shell, Size, Vector,
+};
 
 /// An [`Overlay`] container that displays multiple overlay [`overlay::Element`]
 /// children.
@@ -61,17 +63,16 @@ where
     Renderer: crate::Renderer,
 {
     fn layout(
-        &self,
+        &mut self,
         renderer: &Renderer,
         bounds: Size,
-        position: Point,
+        _position: Point,
+        translation: Vector,
     ) -> layout::Node {
-        let translation = position - Point::ORIGIN;
-
         layout::Node::with_children(
             bounds,
             self.children
-                .iter()
+                .iter_mut()
                 .map(|child| child.layout(renderer, bounds, translation))
                 .collect(),
         )
@@ -138,12 +139,12 @@ where
         renderer: &Renderer,
         operation: &mut dyn widget::Operation<Message>,
     ) {
-        operation.container(None, &mut |operation| {
+        operation.container(None, layout.bounds(), &mut |operation| {
             self.children.iter_mut().zip(layout.children()).for_each(
                 |(child, layout)| {
                     child.operate(layout, renderer, operation);
                 },
-            )
+            );
         });
     }
 
diff --git a/core/src/rectangle.rs b/core/src/rectangle.rs
index 7ff324cb..c1c2eeac 100644
--- a/core/src/rectangle.rs
+++ b/core/src/rectangle.rs
@@ -74,9 +74,9 @@ impl Rectangle<f32> {
     /// Returns true if the given [`Point`] is contained in the [`Rectangle`].
     pub fn contains(&self, point: Point) -> bool {
         self.x <= point.x
-            && point.x <= self.x + self.width
+            && point.x < self.x + self.width
             && self.y <= point.y
-            && point.y <= self.y + self.height
+            && point.y < self.y + self.height
     }
 
     /// Returns true if the current [`Rectangle`] is completely within the given
@@ -197,3 +197,18 @@ where
         }
     }
 }
+
+impl<T> std::ops::Sub<Vector<T>> for Rectangle<T>
+where
+    T: std::ops::Sub<Output = T>,
+{
+    type Output = Rectangle<T>;
+
+    fn sub(self, translation: Vector<T>) -> Self {
+        Rectangle {
+            x: self.x - translation.x,
+            y: self.y - translation.y,
+            ..self
+        }
+    }
+}
diff --git a/core/src/renderer.rs b/core/src/renderer.rs
index 7c73d2e4..1b327e56 100644
--- a/core/src/renderer.rs
+++ b/core/src/renderer.rs
@@ -5,26 +5,13 @@ mod null;
 #[cfg(debug_assertions)]
 pub use null::Null;
 
-use crate::layout;
-use crate::{Background, BorderRadius, Color, Element, Rectangle, Vector};
+use crate::{Background, BorderRadius, Color, Rectangle, Vector};
 
 /// A component that can be used by widgets to draw themselves on a screen.
 pub trait Renderer: Sized {
     /// The supported theme of the [`Renderer`].
     type Theme;
 
-    /// Lays out the elements of a user interface.
-    ///
-    /// You should override this if you need to perform any operations before or
-    /// after layouting. For instance, trimming the measurements cache.
-    fn layout<Message>(
-        &mut self,
-        element: &Element<'_, Message, Self>,
-        limits: &layout::Limits,
-    ) -> layout::Node {
-        element.as_widget().layout(self, limits)
-    }
-
     /// Draws the primitives recorded in the given closure in a new layer.
     ///
     /// The layer will clip its contents to the provided `bounds`.
diff --git a/core/src/renderer/null.rs b/core/src/renderer/null.rs
index 5d49699e..da0f32de 100644
--- a/core/src/renderer/null.rs
+++ b/core/src/renderer/null.rs
@@ -1,6 +1,7 @@
+use crate::alignment;
 use crate::renderer::{self, Renderer};
 use crate::text::{self, Text};
-use crate::{Background, Font, Point, Rectangle, Size, Vector};
+use crate::{Background, Color, Font, Pixels, Point, Rectangle, Size, Vector};
 
 use std::borrow::Cow;
 
@@ -41,6 +42,8 @@ impl Renderer for Null {
 
 impl text::Renderer for Null {
     type Font = Font;
+    type Paragraph = ();
+    type Editor = ();
 
     const ICON_FONT: Font = Font::DEFAULT;
     const CHECKMARK_ICON: char = '0';
@@ -50,37 +53,117 @@ impl text::Renderer for Null {
         Font::default()
     }
 
-    fn default_size(&self) -> f32 {
-        16.0
+    fn default_size(&self) -> Pixels {
+        Pixels(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,
-        _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> {
+    fn fill_paragraph(
+        &mut self,
+        _paragraph: &Self::Paragraph,
+        _position: Point,
+        _color: Color,
+    ) {
+    }
+
+    fn fill_editor(
+        &mut self,
+        _editor: &Self::Editor,
+        _position: Point,
+        _color: Color,
+    ) {
+    }
+
+    fn fill_text(
+        &mut self,
+        _paragraph: Text<'_, Self::Font>,
+        _position: Point,
+        _color: Color,
+    ) {
+    }
+}
+
+impl text::Paragraph for () {
+    type Font = Font;
+
+    fn with_text(_text: Text<'_, Self::Font>) -> Self {}
+
+    fn resize(&mut self, _new_bounds: Size) {}
+
+    fn compare(&self, _text: Text<'_, Self::Font>) -> text::Difference {
+        text::Difference::None
+    }
+
+    fn horizontal_alignment(&self) -> alignment::Horizontal {
+        alignment::Horizontal::Left
+    }
+
+    fn vertical_alignment(&self) -> alignment::Vertical {
+        alignment::Vertical::Top
+    }
+
+    fn grapheme_position(&self, _line: usize, _index: usize) -> Option<Point> {
+        None
+    }
+
+    fn min_bounds(&self) -> Size {
+        Size::ZERO
+    }
+
+    fn hit_test(&self, _point: Point) -> Option<text::Hit> {
+        None
+    }
+}
+
+impl text::Editor for () {
+    type Font = Font;
+
+    fn with_text(_text: &str) -> Self {}
+
+    fn cursor(&self) -> text::editor::Cursor {
+        text::editor::Cursor::Caret(Point::ORIGIN)
+    }
+
+    fn cursor_position(&self) -> (usize, usize) {
+        (0, 0)
+    }
+
+    fn selection(&self) -> Option<String> {
+        None
+    }
+
+    fn line(&self, _index: usize) -> Option<&str> {
         None
     }
 
-    fn fill_text(&mut self, _text: Text<'_, Self::Font>) {}
+    fn line_count(&self) -> usize {
+        0
+    }
+
+    fn perform(&mut self, _action: text::editor::Action) {}
+
+    fn bounds(&self) -> Size {
+        Size::ZERO
+    }
+
+    fn update(
+        &mut self,
+        _new_bounds: Size,
+        _new_font: Self::Font,
+        _new_size: Pixels,
+        _new_line_height: text::LineHeight,
+        _new_highlighter: &mut impl text::Highlighter,
+    ) {
+    }
+
+    fn highlight<H: text::Highlighter>(
+        &mut self,
+        _font: Self::Font,
+        _highlighter: &mut H,
+        _format_highlight: impl Fn(
+            &H::Highlight,
+        ) -> text::highlighter::Format<Self::Font>,
+    ) {
+    }
 }
diff --git a/core/src/shell.rs b/core/src/shell.rs
index 74a5c616..2952ceff 100644
--- a/core/src/shell.rs
+++ b/core/src/shell.rs
@@ -35,7 +35,7 @@ impl<'a, Message> Shell<'a, Message> {
         self.messages.push(message);
     }
 
-    /// Requests a new frame to be drawn at the given [`Instant`].
+    /// Requests a new frame to be drawn.
     pub fn request_redraw(&mut self, request: window::RedrawRequest) {
         match self.redraw_request {
             None => {
@@ -48,7 +48,7 @@ impl<'a, Message> Shell<'a, Message> {
         }
     }
 
-    /// Returns the requested [`Instant`] a redraw should happen, if any.
+    /// Returns the request a redraw should happen, if any.
     pub fn redraw_request(&self) -> Option<window::RedrawRequest> {
         self.redraw_request
     }
@@ -71,7 +71,7 @@ impl<'a, Message> Shell<'a, Message> {
         if self.is_layout_invalid {
             self.is_layout_invalid = false;
 
-            f()
+            f();
         }
     }
 
diff --git a/core/src/text.rs b/core/src/text.rs
index fc8aa20e..546d0b5c 100644
--- a/core/src/text.rs
+++ b/core/src/text.rs
@@ -1,6 +1,15 @@
 //! Draw and interact with text.
+mod paragraph;
+
+pub mod editor;
+pub mod highlighter;
+
+pub use editor::Editor;
+pub use highlighter::Highlighter;
+pub use paragraph::Paragraph;
+
 use crate::alignment;
-use crate::{Color, Pixels, Point, Rectangle, Size};
+use crate::{Color, Pixels, Point, Size};
 
 use std::borrow::Cow;
 use std::hash::{Hash, Hasher};
@@ -12,17 +21,14 @@ pub struct Text<'a, Font> {
     pub content: &'a str,
 
     /// The bounds of the paragraph.
-    pub bounds: Rectangle,
+    pub bounds: Size,
 
     /// The size of the [`Text`] in logical pixels.
-    pub size: f32,
+    pub size: Pixels,
 
     /// 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,
 
@@ -129,10 +135,43 @@ impl Hit {
     }
 }
 
+/// The difference detected in some text.
+///
+/// You will obtain a [`Difference`] when you [`compare`] a [`Paragraph`] with some
+/// [`Text`].
+///
+/// [`compare`]: Paragraph::compare
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Difference {
+    /// No difference.
+    ///
+    /// The text can be reused as it is!
+    None,
+
+    /// A bounds difference.
+    ///
+    /// This normally means a relayout is necessary, but the shape of the text can
+    /// be reused.
+    Bounds,
+
+    /// A shape difference.
+    ///
+    /// The contents, alignment, sizes, fonts, or any other essential attributes
+    /// of the shape of the text have changed. A complete reshape and relayout of
+    /// the text is necessary.
+    Shape,
+}
+
 /// A renderer capable of measuring and drawing [`Text`].
 pub trait Renderer: crate::Renderer {
     /// The font type used.
-    type Font: Copy;
+    type Font: Copy + PartialEq;
+
+    /// The [`Paragraph`] of this [`Renderer`].
+    type Paragraph: Paragraph<Font = Self::Font> + 'static;
+
+    /// The [`Editor`] of this [`Renderer`].
+    type Editor: Editor<Font = Self::Font> + 'static;
 
     /// The icon font of the backend.
     const ICON_FONT: Self::Font;
@@ -151,62 +190,35 @@ pub trait Renderer: crate::Renderer {
     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>;
+    fn default_size(&self) -> Pixels;
 
     /// 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>);
+    /// Draws the given [`Paragraph`] at the given position and with the given
+    /// [`Color`].
+    fn fill_paragraph(
+        &mut self,
+        text: &Self::Paragraph,
+        position: Point,
+        color: Color,
+    );
+
+    /// Draws the given [`Editor`] at the given position and with the given
+    /// [`Color`].
+    fn fill_editor(
+        &mut self,
+        editor: &Self::Editor,
+        position: Point,
+        color: Color,
+    );
+
+    /// Draws the given [`Text`] at the given position and with the given
+    /// [`Color`].
+    fn fill_text(
+        &mut self,
+        text: Text<'_, Self::Font>,
+        position: Point,
+        color: Color,
+    );
 }
diff --git a/core/src/text/editor.rs b/core/src/text/editor.rs
new file mode 100644
index 00000000..f3c6e342
--- /dev/null
+++ b/core/src/text/editor.rs
@@ -0,0 +1,181 @@
+//! Edit text.
+use crate::text::highlighter::{self, Highlighter};
+use crate::text::LineHeight;
+use crate::{Pixels, Point, Rectangle, Size};
+
+use std::sync::Arc;
+
+/// A component that can be used by widgets to edit multi-line text.
+pub trait Editor: Sized + Default {
+    /// The font of the [`Editor`].
+    type Font: Copy + PartialEq + Default;
+
+    /// Creates a new [`Editor`] laid out with the given text.
+    fn with_text(text: &str) -> Self;
+
+    /// Returns the current [`Cursor`] of the [`Editor`].
+    fn cursor(&self) -> Cursor;
+
+    /// Returns the current cursor position of the [`Editor`].
+    ///
+    /// Line and column, respectively.
+    fn cursor_position(&self) -> (usize, usize);
+
+    /// Returns the current selected text of the [`Editor`].
+    fn selection(&self) -> Option<String>;
+
+    /// Returns the text of the given line in the [`Editor`], if it exists.
+    fn line(&self, index: usize) -> Option<&str>;
+
+    /// Returns the amount of lines in the [`Editor`].
+    fn line_count(&self) -> usize;
+
+    /// Performs an [`Action`] on the [`Editor`].
+    fn perform(&mut self, action: Action);
+
+    /// Returns the current boundaries of the [`Editor`].
+    fn bounds(&self) -> Size;
+
+    /// Updates the [`Editor`] with some new attributes.
+    fn update(
+        &mut self,
+        new_bounds: Size,
+        new_font: Self::Font,
+        new_size: Pixels,
+        new_line_height: LineHeight,
+        new_highlighter: &mut impl Highlighter,
+    );
+
+    /// Runs a text [`Highlighter`] in the [`Editor`].
+    fn highlight<H: Highlighter>(
+        &mut self,
+        font: Self::Font,
+        highlighter: &mut H,
+        format_highlight: impl Fn(&H::Highlight) -> highlighter::Format<Self::Font>,
+    );
+}
+
+/// An interaction with an [`Editor`].
+#[derive(Debug, Clone, PartialEq)]
+pub enum Action {
+    /// Apply a [`Motion`].
+    Move(Motion),
+    /// Select text with a given [`Motion`].
+    Select(Motion),
+    /// Select the word at the current cursor.
+    SelectWord,
+    /// Select the line at the current cursor.
+    SelectLine,
+    /// Perform an [`Edit`].
+    Edit(Edit),
+    /// Click the [`Editor`] at the given [`Point`].
+    Click(Point),
+    /// Drag the mouse on the [`Editor`] to the given [`Point`].
+    Drag(Point),
+    /// Scroll the [`Editor`] a certain amount of lines.
+    Scroll {
+        /// The amount of lines to scroll.
+        lines: i32,
+    },
+}
+
+impl Action {
+    /// Returns whether the [`Action`] is an editing action.
+    pub fn is_edit(&self) -> bool {
+        matches!(self, Self::Edit(_))
+    }
+}
+
+/// An action that edits text.
+#[derive(Debug, Clone, PartialEq)]
+pub enum Edit {
+    /// Insert the given character.
+    Insert(char),
+    /// Paste the given text.
+    Paste(Arc<String>),
+    /// Break the current line.
+    Enter,
+    /// Delete the previous character.
+    Backspace,
+    /// Delete the next character.
+    Delete,
+}
+
+/// A cursor movement.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum Motion {
+    /// Move left.
+    Left,
+    /// Move right.
+    Right,
+    /// Move up.
+    Up,
+    /// Move down.
+    Down,
+    /// Move to the left boundary of a word.
+    WordLeft,
+    /// Move to the right boundary of a word.
+    WordRight,
+    /// Move to the start of the line.
+    Home,
+    /// Move to the end of the line.
+    End,
+    /// Move to the start of the previous window.
+    PageUp,
+    /// Move to the start of the next window.
+    PageDown,
+    /// Move to the start of the text.
+    DocumentStart,
+    /// Move to the end of the text.
+    DocumentEnd,
+}
+
+impl Motion {
+    /// Widens the [`Motion`], if possible.
+    pub fn widen(self) -> Self {
+        match self {
+            Self::Left => Self::WordLeft,
+            Self::Right => Self::WordRight,
+            Self::Home => Self::DocumentStart,
+            Self::End => Self::DocumentEnd,
+            _ => self,
+        }
+    }
+
+    /// Returns the [`Direction`] of the [`Motion`].
+    pub fn direction(&self) -> Direction {
+        match self {
+            Self::Left
+            | Self::Up
+            | Self::WordLeft
+            | Self::Home
+            | Self::PageUp
+            | Self::DocumentStart => Direction::Left,
+            Self::Right
+            | Self::Down
+            | Self::WordRight
+            | Self::End
+            | Self::PageDown
+            | Self::DocumentEnd => Direction::Right,
+        }
+    }
+}
+
+/// A direction in some text.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Direction {
+    /// <-
+    Left,
+    /// ->
+    Right,
+}
+
+/// The cursor of an [`Editor`].
+#[derive(Debug, Clone)]
+pub enum Cursor {
+    /// Cursor without a selection
+    Caret(Point),
+
+    /// Cursor selecting a range of text
+    Selection(Vec<Rectangle>),
+}
diff --git a/core/src/text/highlighter.rs b/core/src/text/highlighter.rs
new file mode 100644
index 00000000..a0535228
--- /dev/null
+++ b/core/src/text/highlighter.rs
@@ -0,0 +1,88 @@
+//! Highlight text.
+use crate::Color;
+
+use std::ops::Range;
+
+/// A type capable of highlighting text.
+///
+/// A [`Highlighter`] highlights lines in sequence. When a line changes,
+/// it must be notified and the lines after the changed one must be fed
+/// again to the [`Highlighter`].
+pub trait Highlighter: 'static {
+    /// The settings to configure the [`Highlighter`].
+    type Settings: PartialEq + Clone;
+
+    /// The output of the [`Highlighter`].
+    type Highlight;
+
+    /// The highlight iterator type.
+    type Iterator<'a>: Iterator<Item = (Range<usize>, Self::Highlight)>
+    where
+        Self: 'a;
+
+    /// Creates a new [`Highlighter`] from its [`Self::Settings`].
+    fn new(settings: &Self::Settings) -> Self;
+
+    /// Updates the [`Highlighter`] with some new [`Self::Settings`].
+    fn update(&mut self, new_settings: &Self::Settings);
+
+    /// Notifies the [`Highlighter`] that the line at the given index has changed.
+    fn change_line(&mut self, line: usize);
+
+    /// Highlights the given line.
+    ///
+    /// If a line changed prior to this, the first line provided here will be the
+    /// line that changed.
+    fn highlight_line(&mut self, line: &str) -> Self::Iterator<'_>;
+
+    /// Returns the current line of the [`Highlighter`].
+    ///
+    /// If `change_line` has been called, this will normally be the least index
+    /// that changed.
+    fn current_line(&self) -> usize;
+}
+
+/// A highlighter that highlights nothing.
+#[derive(Debug, Clone, Copy)]
+pub struct PlainText;
+
+impl Highlighter for PlainText {
+    type Settings = ();
+    type Highlight = ();
+
+    type Iterator<'a> = std::iter::Empty<(Range<usize>, Self::Highlight)>;
+
+    fn new(_settings: &Self::Settings) -> Self {
+        Self
+    }
+
+    fn update(&mut self, _new_settings: &Self::Settings) {}
+
+    fn change_line(&mut self, _line: usize) {}
+
+    fn highlight_line(&mut self, _line: &str) -> Self::Iterator<'_> {
+        std::iter::empty()
+    }
+
+    fn current_line(&self) -> usize {
+        usize::MAX
+    }
+}
+
+/// The format of some text.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Format<Font> {
+    /// The [`Color`] of the text.
+    pub color: Option<Color>,
+    /// The `Font` of the text.
+    pub font: Option<Font>,
+}
+
+impl<Font> Default for Format<Font> {
+    fn default() -> Self {
+        Self {
+            color: None,
+            font: None,
+        }
+    }
+}
diff --git a/core/src/text/paragraph.rs b/core/src/text/paragraph.rs
new file mode 100644
index 00000000..de1fb74d
--- /dev/null
+++ b/core/src/text/paragraph.rs
@@ -0,0 +1,59 @@
+use crate::alignment;
+use crate::text::{Difference, Hit, Text};
+use crate::{Point, Size};
+
+/// A text paragraph.
+pub trait Paragraph: Sized + Default {
+    /// The font of this [`Paragraph`].
+    type Font: Copy + PartialEq;
+
+    /// Creates a new [`Paragraph`] laid out with the given [`Text`].
+    fn with_text(text: Text<'_, Self::Font>) -> Self;
+
+    /// Lays out the [`Paragraph`] with some new boundaries.
+    fn resize(&mut self, new_bounds: Size);
+
+    /// Compares the [`Paragraph`] with some desired [`Text`] and returns the
+    /// [`Difference`].
+    fn compare(&self, text: Text<'_, Self::Font>) -> Difference;
+
+    /// Returns the horizontal alignment of the [`Paragraph`].
+    fn horizontal_alignment(&self) -> alignment::Horizontal;
+
+    /// Returns the vertical alignment of the [`Paragraph`].
+    fn vertical_alignment(&self) -> alignment::Vertical;
+
+    /// Returns the minimum boundaries that can fit the contents of the
+    /// [`Paragraph`].
+    fn min_bounds(&self) -> Size;
+
+    /// Tests whether the provided point is within the boundaries of the
+    /// [`Paragraph`], returning information about the nearest character.
+    fn hit_test(&self, point: Point) -> Option<Hit>;
+
+    /// Returns the distance to the given grapheme index in the [`Paragraph`].
+    fn grapheme_position(&self, line: usize, index: usize) -> Option<Point>;
+
+    /// Updates the [`Paragraph`] to match the given [`Text`], if needed.
+    fn update(&mut self, text: Text<'_, Self::Font>) {
+        match self.compare(text) {
+            Difference::None => {}
+            Difference::Bounds => {
+                self.resize(text.bounds);
+            }
+            Difference::Shape => {
+                *self = Self::with_text(text);
+            }
+        }
+    }
+
+    /// Returns the minimum width that can fit the contents of the [`Paragraph`].
+    fn min_width(&self) -> f32 {
+        self.min_bounds().width
+    }
+
+    /// Returns the minimum height that can fit the contents of the [`Paragraph`].
+    fn min_height(&self) -> f32 {
+        self.min_bounds().height
+    }
+}
diff --git a/core/src/widget.rs b/core/src/widget.rs
index 79d86444..294d5984 100644
--- a/core/src/widget.rs
+++ b/core/src/widget.rs
@@ -33,12 +33,12 @@ use crate::{Clipboard, Length, 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/0.9/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
+/// [examples]: https://github.com/iced-rs/iced/tree/0.10/examples
+/// [`bezier_tool`]: https://github.com/iced-rs/iced/tree/0.10/examples/bezier_tool
+/// [`custom_widget`]: https://github.com/iced-rs/iced/tree/0.10/examples/custom_widget
+/// [`geometry`]: https://github.com/iced-rs/iced/tree/0.10/examples/geometry
 /// [`lyon`]: https://github.com/nical/lyon
-/// [`iced_wgpu`]: https://github.com/iced-rs/iced/tree/0.9/wgpu
+/// [`iced_wgpu`]: https://github.com/iced-rs/iced/tree/0.10/wgpu
 pub trait Widget<Message, Renderer>
 where
     Renderer: crate::Renderer,
@@ -55,6 +55,7 @@ where
     /// user interface.
     fn layout(
         &self,
+        tree: &mut Tree,
         renderer: &Renderer,
         limits: &layout::Limits,
     ) -> layout::Node;
@@ -62,7 +63,7 @@ where
     /// Draws the [`Widget`] using the associated `Renderer`.
     fn draw(
         &self,
-        state: &Tree,
+        tree: &Tree,
         renderer: &mut Renderer,
         theme: &Renderer::Theme,
         style: &renderer::Style,
@@ -115,6 +116,7 @@ where
         _renderer: &Renderer,
         _clipboard: &mut dyn Clipboard,
         _shell: &mut Shell<'_, Message>,
+        _viewport: &Rectangle,
     ) -> event::Status {
         event::Status::Ignored
     }
diff --git a/core/src/widget/operation.rs b/core/src/widget/operation.rs
index ad188c36..b91cf9ac 100644
--- a/core/src/widget/operation.rs
+++ b/core/src/widget/operation.rs
@@ -8,6 +8,7 @@ pub use scrollable::Scrollable;
 pub use text_input::TextInput;
 
 use crate::widget::Id;
+use crate::{Rectangle, Vector};
 
 use std::any::Any;
 use std::fmt;
@@ -23,6 +24,7 @@ pub trait Operation<T> {
     fn container(
         &mut self,
         id: Option<&Id>,
+        bounds: Rectangle,
         operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
     );
 
@@ -30,7 +32,14 @@ pub trait Operation<T> {
     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>) {}
+    fn scrollable(
+        &mut self,
+        _state: &mut dyn Scrollable,
+        _id: Option<&Id>,
+        _bounds: Rectangle,
+        _translation: Vector,
+    ) {
+    }
 
     /// Operates on a widget that has text input.
     fn text_input(&mut self, _state: &mut dyn TextInput, _id: Option<&Id>) {}
@@ -92,6 +101,7 @@ where
         fn container(
             &mut self,
             id: Option<&Id>,
+            bounds: Rectangle,
             operate_on_children: &mut dyn FnMut(&mut dyn Operation<B>),
         ) {
             struct MapRef<'a, A> {
@@ -102,11 +112,12 @@ where
                 fn container(
                     &mut self,
                     id: Option<&Id>,
+                    bounds: Rectangle,
                     operate_on_children: &mut dyn FnMut(&mut dyn Operation<B>),
                 ) {
                     let Self { operation, .. } = self;
 
-                    operation.container(id, &mut |operation| {
+                    operation.container(id, bounds, &mut |operation| {
                         operate_on_children(&mut MapRef { operation });
                     });
                 }
@@ -115,8 +126,10 @@ where
                     &mut self,
                     state: &mut dyn Scrollable,
                     id: Option<&Id>,
+                    bounds: Rectangle,
+                    translation: Vector,
                 ) {
-                    self.operation.scrollable(state, id);
+                    self.operation.scrollable(state, id, bounds, translation);
                 }
 
                 fn focusable(
@@ -145,15 +158,21 @@ where
             MapRef {
                 operation: operation.as_mut(),
             }
-            .container(id, operate_on_children);
+            .container(id, bounds, 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 scrollable(
+            &mut self,
+            state: &mut dyn Scrollable,
+            id: Option<&Id>,
+            bounds: Rectangle,
+            translation: Vector,
+        ) {
+            self.operation.scrollable(state, id, bounds, translation);
         }
 
         fn text_input(&mut self, state: &mut dyn TextInput, id: Option<&Id>) {
@@ -197,6 +216,7 @@ pub fn scope<T: 'static>(
         fn container(
             &mut self,
             id: Option<&Id>,
+            _bounds: Rectangle,
             operate_on_children: &mut dyn FnMut(&mut dyn Operation<Message>),
         ) {
             if id == Some(&self.target) {
diff --git a/core/src/widget/operation/focusable.rs b/core/src/widget/operation/focusable.rs
index 312e4894..68c22faa 100644
--- a/core/src/widget/operation/focusable.rs
+++ b/core/src/widget/operation/focusable.rs
@@ -1,6 +1,7 @@
 //! Operate on widgets that can be focused.
 use crate::widget::operation::{Operation, Outcome};
 use crate::widget::Id;
+use crate::Rectangle;
 
 /// The internal state of a widget that can be focused.
 pub trait Focusable {
@@ -45,9 +46,10 @@ pub fn focus<T>(target: Id) -> impl Operation<T> {
         fn container(
             &mut self,
             _id: Option<&Id>,
+            _bounds: Rectangle,
             operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
         ) {
-            operate_on_children(self)
+            operate_on_children(self);
         }
     }
 
@@ -80,9 +82,10 @@ where
         fn container(
             &mut self,
             _id: Option<&Id>,
+            _bounds: Rectangle,
             operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
         ) {
-            operate_on_children(self)
+            operate_on_children(self);
         }
 
         fn finish(&self) -> Outcome<T> {
@@ -126,9 +129,10 @@ pub fn focus_previous<T>() -> impl Operation<T> {
         fn container(
             &mut self,
             _id: Option<&Id>,
+            _bounds: Rectangle,
             operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
         ) {
-            operate_on_children(self)
+            operate_on_children(self);
         }
     }
 
@@ -159,9 +163,10 @@ pub fn focus_next<T>() -> impl Operation<T> {
         fn container(
             &mut self,
             _id: Option<&Id>,
+            _bounds: Rectangle,
             operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
         ) {
-            operate_on_children(self)
+            operate_on_children(self);
         }
     }
 
@@ -185,9 +190,10 @@ pub fn find_focused() -> impl Operation<Id> {
         fn container(
             &mut self,
             _id: Option<&Id>,
+            _bounds: Rectangle,
             operate_on_children: &mut dyn FnMut(&mut dyn Operation<Id>),
         ) {
-            operate_on_children(self)
+            operate_on_children(self);
         }
 
         fn finish(&self) -> Outcome<Id> {
diff --git a/core/src/widget/operation/scrollable.rs b/core/src/widget/operation/scrollable.rs
index f947344d..12161255 100644
--- a/core/src/widget/operation/scrollable.rs
+++ b/core/src/widget/operation/scrollable.rs
@@ -1,5 +1,6 @@
 //! Operate on widgets that can be scrolled.
 use crate::widget::{Id, Operation};
+use crate::{Rectangle, Vector};
 
 /// The internal state of a widget that can be scrolled.
 pub trait Scrollable {
@@ -22,12 +23,19 @@ pub fn snap_to<T>(target: Id, offset: RelativeOffset) -> impl Operation<T> {
         fn container(
             &mut self,
             _id: Option<&Id>,
+            _bounds: Rectangle,
             operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
         ) {
-            operate_on_children(self)
+            operate_on_children(self);
         }
 
-        fn scrollable(&mut self, state: &mut dyn Scrollable, id: Option<&Id>) {
+        fn scrollable(
+            &mut self,
+            state: &mut dyn Scrollable,
+            id: Option<&Id>,
+            _bounds: Rectangle,
+            _translation: Vector,
+        ) {
             if Some(&self.target) == id {
                 state.snap_to(self.offset);
             }
@@ -49,12 +57,19 @@ pub fn scroll_to<T>(target: Id, offset: AbsoluteOffset) -> impl Operation<T> {
         fn container(
             &mut self,
             _id: Option<&Id>,
+            _bounds: Rectangle,
             operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
         ) {
-            operate_on_children(self)
+            operate_on_children(self);
         }
 
-        fn scrollable(&mut self, state: &mut dyn Scrollable, id: Option<&Id>) {
+        fn scrollable(
+            &mut self,
+            state: &mut dyn Scrollable,
+            id: Option<&Id>,
+            _bounds: Rectangle,
+            _translation: Vector,
+        ) {
             if Some(&self.target) == id {
                 state.scroll_to(self.offset);
             }
diff --git a/core/src/widget/operation/text_input.rs b/core/src/widget/operation/text_input.rs
index 4c773e99..41731d4c 100644
--- a/core/src/widget/operation/text_input.rs
+++ b/core/src/widget/operation/text_input.rs
@@ -1,6 +1,7 @@
 //! Operate on widgets that have text input.
 use crate::widget::operation::Operation;
 use crate::widget::Id;
+use crate::Rectangle;
 
 /// The internal state of a widget that has text input.
 pub trait TextInput {
@@ -34,9 +35,10 @@ pub fn move_cursor_to_front<T>(target: Id) -> impl Operation<T> {
         fn container(
             &mut self,
             _id: Option<&Id>,
+            _bounds: Rectangle,
             operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
         ) {
-            operate_on_children(self)
+            operate_on_children(self);
         }
     }
 
@@ -63,9 +65,10 @@ pub fn move_cursor_to_end<T>(target: Id) -> impl Operation<T> {
         fn container(
             &mut self,
             _id: Option<&Id>,
+            _bounds: Rectangle,
             operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
         ) {
-            operate_on_children(self)
+            operate_on_children(self);
         }
     }
 
@@ -93,9 +96,10 @@ pub fn move_cursor_to<T>(target: Id, position: usize) -> impl Operation<T> {
         fn container(
             &mut self,
             _id: Option<&Id>,
+            _bounds: Rectangle,
             operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
         ) {
-            operate_on_children(self)
+            operate_on_children(self);
         }
     }
 
@@ -121,9 +125,10 @@ pub fn select_all<T>(target: Id) -> impl Operation<T> {
         fn container(
             &mut self,
             _id: Option<&Id>,
+            _bounds: Rectangle,
             operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
         ) {
-            operate_on_children(self)
+            operate_on_children(self);
         }
     }
 
diff --git a/core/src/widget/text.rs b/core/src/widget/text.rs
index 79df2b02..97e0acac 100644
--- a/core/src/widget/text.rs
+++ b/core/src/widget/text.rs
@@ -3,9 +3,9 @@ use crate::alignment;
 use crate::layout;
 use crate::mouse;
 use crate::renderer;
-use crate::text;
-use crate::widget::Tree;
-use crate::{Color, Element, Layout, Length, Pixels, Rectangle, Widget};
+use crate::text::{self, Paragraph};
+use crate::widget::tree::{self, Tree};
+use crate::{Color, Element, Layout, Length, Pixels, Point, Rectangle, Widget};
 
 use std::borrow::Cow;
 
@@ -19,7 +19,7 @@ where
     Renderer::Theme: StyleSheet,
 {
     content: Cow<'a, str>,
-    size: Option<f32>,
+    size: Option<Pixels>,
     line_height: LineHeight,
     width: Length,
     height: Length,
@@ -53,7 +53,7 @@ where
 
     /// Sets the size of the [`Text`].
     pub fn size(mut self, size: impl Into<Pixels>) -> Self {
-        self.size = Some(size.into().0);
+        self.size = Some(size.into());
         self
     }
 
@@ -117,11 +117,23 @@ where
     }
 }
 
+/// The internal state of a [`Text`] widget.
+#[derive(Debug, Default)]
+pub struct State<P: Paragraph>(P);
+
 impl<'a, Message, Renderer> Widget<Message, Renderer> for Text<'a, Renderer>
 where
     Renderer: text::Renderer,
     Renderer::Theme: StyleSheet,
 {
+    fn tag(&self) -> tree::Tag {
+        tree::Tag::of::<State<Renderer::Paragraph>>()
+    }
+
+    fn state(&self) -> tree::State {
+        tree::State::new(State(Renderer::Paragraph::default()))
+    }
+
     fn width(&self) -> Length {
         self.width
     }
@@ -132,30 +144,29 @@ where
 
     fn layout(
         &self,
+        tree: &mut Tree,
         renderer: &Renderer,
         limits: &layout::Limits,
     ) -> layout::Node {
-        let limits = limits.width(self.width).height(self.height);
-
-        let size = self.size.unwrap_or_else(|| renderer.default_size());
-
-        let bounds = renderer.measure(
+        layout(
+            tree.state.downcast_mut::<State<Renderer::Paragraph>>(),
+            renderer,
+            limits,
+            self.width,
+            self.height,
             &self.content,
-            size,
             self.line_height,
-            self.font.unwrap_or_else(|| renderer.default_font()),
-            limits.max(),
+            self.size,
+            self.font,
+            self.horizontal_alignment,
+            self.vertical_alignment,
             self.shaping,
-        );
-
-        let size = limits.resolve(bounds);
-
-        layout::Node::new(size)
+        )
     }
 
     fn draw(
         &self,
-        _state: &Tree,
+        tree: &Tree,
         renderer: &mut Renderer,
         theme: &Renderer::Theme,
         style: &renderer::Style,
@@ -163,22 +174,60 @@ where
         _cursor_position: mouse::Cursor,
         _viewport: &Rectangle,
     ) {
+        let state = tree.state.downcast_ref::<State<Renderer::Paragraph>>();
+
         draw(
             renderer,
             style,
             layout,
-            &self.content,
-            self.size,
-            self.line_height,
-            self.font,
+            state,
             theme.appearance(self.style.clone()),
-            self.horizontal_alignment,
-            self.vertical_alignment,
-            self.shaping,
         );
     }
 }
 
+/// Produces the [`layout::Node`] of a [`Text`] widget.
+pub fn layout<Renderer>(
+    state: &mut State<Renderer::Paragraph>,
+    renderer: &Renderer,
+    limits: &layout::Limits,
+    width: Length,
+    height: Length,
+    content: &str,
+    line_height: LineHeight,
+    size: Option<Pixels>,
+    font: Option<Renderer::Font>,
+    horizontal_alignment: alignment::Horizontal,
+    vertical_alignment: alignment::Vertical,
+    shaping: Shaping,
+) -> layout::Node
+where
+    Renderer: text::Renderer,
+{
+    let limits = limits.width(width).height(height);
+    let bounds = limits.max();
+
+    let size = size.unwrap_or_else(|| renderer.default_size());
+    let font = font.unwrap_or_else(|| renderer.default_font());
+
+    let State(ref mut paragraph) = state;
+
+    paragraph.update(text::Text {
+        content,
+        bounds,
+        size,
+        line_height,
+        font,
+        horizontal_alignment,
+        vertical_alignment,
+        shaping,
+    });
+
+    let size = limits.resolve(paragraph.min_bounds());
+
+    layout::Node::new(size)
+}
+
 /// Draws text using the same logic as the [`Text`] widget.
 ///
 /// Specifically:
@@ -193,44 +242,31 @@ pub fn draw<Renderer>(
     renderer: &mut Renderer,
     style: &renderer::Style,
     layout: Layout<'_>,
-    content: &str,
-    size: Option<f32>,
-    line_height: LineHeight,
-    font: Option<Renderer::Font>,
+    state: &State<Renderer::Paragraph>,
     appearance: Appearance,
-    horizontal_alignment: alignment::Horizontal,
-    vertical_alignment: alignment::Vertical,
-    shaping: Shaping,
 ) where
     Renderer: text::Renderer,
 {
+    let State(ref paragraph) = state;
     let bounds = layout.bounds();
 
-    let x = match horizontal_alignment {
+    let x = match paragraph.horizontal_alignment() {
         alignment::Horizontal::Left => bounds.x,
         alignment::Horizontal::Center => bounds.center_x(),
         alignment::Horizontal::Right => bounds.x + bounds.width,
     };
 
-    let y = match vertical_alignment {
+    let y = match paragraph.vertical_alignment() {
         alignment::Vertical::Top => bounds.y,
         alignment::Vertical::Center => bounds.center_y(),
         alignment::Vertical::Bottom => bounds.y + bounds.height,
     };
 
-    let size = size.unwrap_or_else(|| renderer.default_size());
-
-    renderer.fill_text(crate::Text {
-        content,
-        size,
-        line_height,
-        bounds: Rectangle { x, y, ..bounds },
-        color: appearance.color.unwrap_or(style.text_color),
-        font: font.unwrap_or_else(|| renderer.default_font()),
-        horizontal_alignment,
-        vertical_alignment,
-        shaping,
-    });
+    renderer.fill_paragraph(
+        paragraph,
+        Point::new(x, y),
+        appearance.color.unwrap_or(style.text_color),
+    );
 }
 
 impl<'a, Message, Renderer> From<Text<'a, Renderer>>
diff --git a/core/src/widget/tree.rs b/core/src/widget/tree.rs
index da269632..ff52b1ce 100644
--- a/core/src/widget/tree.rs
+++ b/core/src/widget/tree.rs
@@ -61,7 +61,7 @@ impl Tree {
         Renderer: crate::Renderer,
     {
         if self.tag == new.borrow().tag() {
-            new.borrow().diff(self)
+            new.borrow().diff(self);
         } else {
             *self = Self::new(new);
         }
@@ -78,7 +78,7 @@ impl Tree {
             new_children,
             |tree, widget| tree.diff(widget.borrow()),
             |widget| Self::new(widget.borrow()),
-        )
+        );
     }
 
     /// Reconciliates the children of the tree with the provided list of widgets using custom
@@ -107,6 +107,88 @@ impl Tree {
     }
 }
 
+/// Reconciliates the `current_children` with the provided list of widgets using
+/// custom logic both for diffing and creating new widget state.
+///
+/// The algorithm will try to minimize the impact of diffing by querying the
+/// `maybe_changed` closure.
+pub fn diff_children_custom_with_search<T>(
+    current_children: &mut Vec<Tree>,
+    new_children: &[T],
+    diff: impl Fn(&mut Tree, &T),
+    maybe_changed: impl Fn(usize) -> bool,
+    new_state: impl Fn(&T) -> Tree,
+) {
+    if new_children.is_empty() {
+        current_children.clear();
+        return;
+    }
+
+    if current_children.is_empty() {
+        current_children.extend(new_children.iter().map(new_state));
+        return;
+    }
+
+    let first_maybe_changed = maybe_changed(0);
+    let last_maybe_changed = maybe_changed(current_children.len() - 1);
+
+    if current_children.len() > new_children.len() {
+        if !first_maybe_changed && last_maybe_changed {
+            current_children.truncate(new_children.len());
+        } else {
+            let difference_index = if first_maybe_changed {
+                0
+            } else {
+                (1..current_children.len())
+                    .find(|&i| maybe_changed(i))
+                    .unwrap_or(0)
+            };
+
+            let _ = current_children.splice(
+                difference_index
+                    ..difference_index
+                        + (current_children.len() - new_children.len()),
+                std::iter::empty(),
+            );
+        }
+    }
+
+    if current_children.len() < new_children.len() {
+        let first_maybe_changed = maybe_changed(0);
+        let last_maybe_changed = maybe_changed(current_children.len() - 1);
+
+        if !first_maybe_changed && last_maybe_changed {
+            current_children.extend(
+                new_children[current_children.len()..].iter().map(new_state),
+            );
+        } else {
+            let difference_index = if first_maybe_changed {
+                0
+            } else {
+                (1..current_children.len())
+                    .find(|&i| maybe_changed(i))
+                    .unwrap_or(0)
+            };
+
+            let _ = current_children.splice(
+                difference_index..difference_index,
+                new_children[difference_index
+                    ..difference_index
+                        + (new_children.len() - current_children.len())]
+                    .iter()
+                    .map(new_state),
+            );
+        }
+    }
+
+    // TODO: Merge loop with extend logic (?)
+    for (child_state, new) in
+        current_children.iter_mut().zip(new_children.iter())
+    {
+        diff(child_state, new);
+    }
+}
+
 /// The identifier of some widget state.
 #[derive(Debug, Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Hash)]
 pub struct Tag(any::TypeId);
diff --git a/core/src/window.rs b/core/src/window.rs
index 10db31b6..448ffc45 100644
--- a/core/src/window.rs
+++ b/core/src/window.rs
@@ -1,5 +1,6 @@
 //! Build window-based GUI applications.
 pub mod icon;
+pub mod settings;
 
 mod event;
 mod id;
@@ -7,7 +8,6 @@ mod level;
 mod mode;
 mod position;
 mod redraw_request;
-mod settings;
 mod user_attention;
 
 pub use event::Event;
diff --git a/core/src/window/icon.rs b/core/src/window/icon.rs
index 31868ecf..5ef0eed7 100644
--- a/core/src/window/icon.rs
+++ b/core/src/window/icon.rs
@@ -3,7 +3,7 @@ use crate::Size;
 
 use std::mem;
 
-/// Builds an  [`Icon`] from its RGBA pixels in the sRGB color space.
+/// Builds an  [`Icon`] from its RGBA pixels in the `sRGB` color space.
 pub fn from_rgba(
     rgba: Vec<u8>,
     width: u32,
@@ -49,7 +49,7 @@ impl Icon {
 }
 
 #[derive(Debug, thiserror::Error)]
-/// An error produced when using [`Icon::from_rgba`] with invalid arguments.
+/// An error produced when using [`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.
diff --git a/core/src/window/redraw_request.rs b/core/src/window/redraw_request.rs
index 3b4f0fd3..8a59e83c 100644
--- a/core/src/window/redraw_request.rs
+++ b/core/src/window/redraw_request.rs
@@ -13,7 +13,7 @@ pub enum RedrawRequest {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use std::time::{Duration, Instant};
+    use crate::time::{Duration, Instant};
 
     #[test]
     fn ordering() {
diff --git a/core/src/window/settings.rs b/core/src/window/settings.rs
index eba27914..25df8159 100644
--- a/core/src/window/settings.rs
+++ b/core/src/window/settings.rs
@@ -1,5 +1,4 @@
-use crate::window::{Icon, Level, Position};
-
+//! Configure your windows.
 #[cfg(target_os = "windows")]
 #[path = "settings/windows.rs"]
 mod platform;
@@ -8,6 +7,10 @@ mod platform;
 #[path = "settings/macos.rs"]
 mod platform;
 
+#[cfg(target_os = "linux")]
+#[path = "settings/linux.rs"]
+mod platform;
+
 #[cfg(target_arch = "wasm32")]
 #[path = "settings/wasm.rs"]
 mod platform;
@@ -15,13 +18,15 @@ mod platform;
 #[cfg(not(any(
     target_os = "windows",
     target_os = "macos",
+    target_os = "linux",
     target_arch = "wasm32"
 )))]
 #[path = "settings/other.rs"]
 mod platform;
 
-pub use platform::PlatformSpecific;
+use crate::window::{Icon, Level, Position};
 
+pub use platform::PlatformSpecific;
 /// The window settings of an application.
 #[derive(Debug, Clone)]
 pub struct Settings {
@@ -70,8 +75,8 @@ pub struct Settings {
 }
 
 impl Default for Settings {
-    fn default() -> Settings {
-        Settings {
+    fn default() -> Self {
+        Self {
             size: (1024, 768),
             position: Position::default(),
             min_size: None,
@@ -82,8 +87,8 @@ impl Default for Settings {
             transparent: false,
             level: Level::default(),
             icon: None,
-            platform_specific: Default::default(),
             exit_on_close_request: true,
+            platform_specific: PlatformSpecific::default(),
         }
     }
 }
diff --git a/core/src/window/settings/linux.rs b/core/src/window/settings/linux.rs
new file mode 100644
index 00000000..009b9d9e
--- /dev/null
+++ b/core/src/window/settings/linux.rs
@@ -0,0 +1,11 @@
+//! Platform specific settings for Linux.
+
+/// The platform specific window settings of an application.
+#[derive(Debug, Clone, PartialEq, Eq, Default)]
+pub struct PlatformSpecific {
+    /// Sets the application id of the window.
+    ///
+    /// As a best practice, it is suggested to select an application id that match
+    /// the basename of the application’s .desktop file.
+    pub application_id: String,
+}