Remove `pane_grid` example for now

It's too contrived. I will work on something simpler.

10 files changed, 393 insertions, 607 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 37b20ec4..01231b70 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -44,7 +44,6 @@ members = [
     "examples/events",
     "examples/geometry",
     "examples/integration",
-    "examples/pane_grid",
     "examples/pokedex",
     "examples/progress_bar",
     "examples/solar_system",
diff --git a/examples/clock/Cargo.toml b/examples/clock/Cargo.toml
index ab771405..308cbfbb 100644
--- a/examples/clock/Cargo.toml
+++ b/examples/clock/Cargo.toml
@@ -5,6 +5,9 @@ authors = ["Héctor Ramón Jiménez <hector0193@gmail.com>"]
 edition = "2018"
 publish = false
 
+[features]
+canvas = []
+
 [dependencies]
 iced = { path = "../..", features = ["canvas", "async-std", "debug"] }
 iced_native = { path = "../../native" }
diff --git a/examples/clock/README.md b/examples/clock/README.md
index a87edad0..17509180 100644
--- a/examples/clock/README.md
+++ b/examples/clock/README.md
@@ -2,7 +2,7 @@
 
 An application that uses the `Canvas` widget to draw a clock and its hands to display the current time.
 
-The __[`lib`]__ file contains the relevant code of the example.
+The __[`main`]__ file contains all the code of the example.
 
 <div align="center">
   <img src="https://user-images.githubusercontent.com/518289/74716344-a3e6b300-522e-11ea-8aea-3cc0a5100a2e.gif">
@@ -13,4 +13,4 @@ You can run it with `cargo run`:
 cargo run --package clock
 ```
 
-[`lib`]: src/lib.rs
+[`main`]: src/main.rs
diff --git a/examples/clock/src/lib.rs b/examples/clock/src/lib.rs
deleted file mode 100644
index 229ba8fe..00000000
--- a/examples/clock/src/lib.rs
+++ /dev/null
@@ -1,187 +0,0 @@
-use iced::{
-    canvas, executor, Application, Canvas, Color, Command, Container, Element,
-    Length, Point, Subscription, Vector,
-};
-
-#[derive(Debug)]
-pub struct Clock {
-    now: LocalTime,
-    clock: canvas::layer::Cache<LocalTime>,
-}
-
-#[derive(Debug, Clone, Copy)]
-pub enum Message {
-    Tick(chrono::DateTime<chrono::Local>),
-}
-
-impl Application for Clock {
-    type Executor = executor::Default;
-    type Message = Message;
-
-    fn new() -> (Self, Command<Message>) {
-        (
-            Clock {
-                now: chrono::Local::now().into(),
-                clock: canvas::layer::Cache::new(),
-            },
-            Command::none(),
-        )
-    }
-
-    fn title(&self) -> String {
-        String::from("Clock - Iced")
-    }
-
-    fn update(&mut self, message: Message) -> Command<Message> {
-        match message {
-            Message::Tick(local_time) => {
-                let now = local_time.into();
-
-                if now != self.now {
-                    self.now = now;
-                    self.clock.clear();
-                }
-            }
-        }
-
-        Command::none()
-    }
-
-    fn subscription(&self) -> Subscription<Message> {
-        time::every(std::time::Duration::from_millis(500)).map(Message::Tick)
-    }
-
-    fn view(&mut self) -> Element<Message> {
-        let canvas = Canvas::new()
-            .width(Length::Units(400))
-            .height(Length::Units(400))
-            .push(self.clock.with(&self.now));
-
-        Container::new(canvas)
-            .width(Length::Fill)
-            .height(Length::Fill)
-            .center_x()
-            .center_y()
-            .into()
-    }
-}
-
-#[derive(Debug, PartialEq, Eq)]
-struct LocalTime {
-    hour: u32,
-    minute: u32,
-    second: u32,
-}
-
-impl From<chrono::DateTime<chrono::Local>> for LocalTime {
-    fn from(date_time: chrono::DateTime<chrono::Local>) -> LocalTime {
-        use chrono::Timelike;
-
-        LocalTime {
-            hour: date_time.hour(),
-            minute: date_time.minute(),
-            second: date_time.second(),
-        }
-    }
-}
-
-impl canvas::Drawable for LocalTime {
-    fn draw(&self, frame: &mut canvas::Frame) {
-        let center = frame.center();
-        let radius = frame.width().min(frame.height()) / 2.0;
-        let offset = Vector::new(center.x, center.y);
-
-        let clock = canvas::Path::new(|path| path.circle(center, radius));
-
-        frame.fill(
-            &clock,
-            canvas::Fill::Color(Color::from_rgb8(0x12, 0x93, 0xD8)),
-        );
-
-        fn draw_hand(
-            n: u32,
-            total: u32,
-            length: f32,
-            offset: Vector,
-            path: &mut canvas::path::Builder,
-        ) {
-            let turns = n as f32 / total as f32;
-            let t = 2.0 * std::f32::consts::PI * (turns - 0.25);
-
-            let x = length * t.cos();
-            let y = length * t.sin();
-
-            path.line_to(Point::new(x, y) + offset);
-        }
-
-        let hour_and_minute_hands = canvas::Path::new(|path| {
-            path.move_to(center);
-            draw_hand(self.hour, 12, 0.5 * radius, offset, path);
-
-            path.move_to(center);
-            draw_hand(self.minute, 60, 0.8 * radius, offset, path)
-        });
-
-        frame.stroke(
-            &hour_and_minute_hands,
-            canvas::Stroke {
-                width: 6.0,
-                color: Color::WHITE,
-                line_cap: canvas::LineCap::Round,
-                ..canvas::Stroke::default()
-            },
-        );
-
-        let second_hand = canvas::Path::new(|path| {
-            path.move_to(center);
-            draw_hand(self.second, 60, 0.8 * radius, offset, path)
-        });
-
-        frame.stroke(
-            &second_hand,
-            canvas::Stroke {
-                width: 3.0,
-                color: Color::WHITE,
-                line_cap: canvas::LineCap::Round,
-                ..canvas::Stroke::default()
-            },
-        );
-    }
-}
-
-mod time {
-    use iced::futures;
-
-    pub fn every(
-        duration: std::time::Duration,
-    ) -> iced::Subscription<chrono::DateTime<chrono::Local>> {
-        iced::Subscription::from_recipe(Every(duration))
-    }
-
-    struct Every(std::time::Duration);
-
-    impl<H, I> iced_native::subscription::Recipe<H, I> for Every
-    where
-        H: std::hash::Hasher,
-    {
-        type Output = chrono::DateTime<chrono::Local>;
-
-        fn hash(&self, state: &mut H) {
-            use std::hash::Hash;
-
-            std::any::TypeId::of::<Self>().hash(state);
-            self.0.hash(state);
-        }
-
-        fn stream(
-            self: Box<Self>,
-            _input: futures::stream::BoxStream<'static, I>,
-        ) -> futures::stream::BoxStream<'static, Self::Output> {
-            use futures::stream::StreamExt;
-
-            async_std::stream::interval(self.0)
-                .map(|_| chrono::Local::now())
-                .boxed()
-        }
-    }
-}
diff --git a/examples/clock/src/main.rs b/examples/clock/src/main.rs
index 454ff4f0..d8266f06 100644
--- a/examples/clock/src/main.rs
+++ b/examples/clock/src/main.rs
@@ -1,5 +1,7 @@
-use clock::Clock;
-use iced::{Application, Settings};
+use iced::{
+    canvas, executor, Application, Canvas, Color, Command, Container, Element,
+    Length, Point, Settings, Subscription, Vector,
+};
 
 pub fn main() {
     Clock::run(Settings {
@@ -7,3 +9,185 @@ pub fn main() {
         ..Settings::default()
     })
 }
+
+struct Clock {
+    now: LocalTime,
+    clock: canvas::layer::Cache<LocalTime>,
+}
+
+#[derive(Debug, Clone, Copy)]
+enum Message {
+    Tick(chrono::DateTime<chrono::Local>),
+}
+
+impl Application for Clock {
+    type Executor = executor::Default;
+    type Message = Message;
+
+    fn new() -> (Self, Command<Message>) {
+        (
+            Clock {
+                now: chrono::Local::now().into(),
+                clock: canvas::layer::Cache::new(),
+            },
+            Command::none(),
+        )
+    }
+
+    fn title(&self) -> String {
+        String::from("Clock - Iced")
+    }
+
+    fn update(&mut self, message: Message) -> Command<Message> {
+        match message {
+            Message::Tick(local_time) => {
+                let now = local_time.into();
+
+                if now != self.now {
+                    self.now = now;
+                    self.clock.clear();
+                }
+            }
+        }
+
+        Command::none()
+    }
+
+    fn subscription(&self) -> Subscription<Message> {
+        time::every(std::time::Duration::from_millis(500)).map(Message::Tick)
+    }
+
+    fn view(&mut self) -> Element<Message> {
+        let canvas = Canvas::new()
+            .width(Length::Units(400))
+            .height(Length::Units(400))
+            .push(self.clock.with(&self.now));
+
+        Container::new(canvas)
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .center_x()
+            .center_y()
+            .into()
+    }
+}
+
+#[derive(Debug, PartialEq, Eq)]
+struct LocalTime {
+    hour: u32,
+    minute: u32,
+    second: u32,
+}
+
+impl From<chrono::DateTime<chrono::Local>> for LocalTime {
+    fn from(date_time: chrono::DateTime<chrono::Local>) -> LocalTime {
+        use chrono::Timelike;
+
+        LocalTime {
+            hour: date_time.hour(),
+            minute: date_time.minute(),
+            second: date_time.second(),
+        }
+    }
+}
+
+impl canvas::Drawable for LocalTime {
+    fn draw(&self, frame: &mut canvas::Frame) {
+        let center = frame.center();
+        let radius = frame.width().min(frame.height()) / 2.0;
+        let offset = Vector::new(center.x, center.y);
+
+        let clock = canvas::Path::new(|path| path.circle(center, radius));
+
+        frame.fill(
+            &clock,
+            canvas::Fill::Color(Color::from_rgb8(0x12, 0x93, 0xD8)),
+        );
+
+        fn draw_hand(
+            n: u32,
+            total: u32,
+            length: f32,
+            offset: Vector,
+            path: &mut canvas::path::Builder,
+        ) {
+            let turns = n as f32 / total as f32;
+            let t = 2.0 * std::f32::consts::PI * (turns - 0.25);
+
+            let x = length * t.cos();
+            let y = length * t.sin();
+
+            path.line_to(Point::new(x, y) + offset);
+        }
+
+        let hour_and_minute_hands = canvas::Path::new(|path| {
+            path.move_to(center);
+            draw_hand(self.hour, 12, 0.5 * radius, offset, path);
+
+            path.move_to(center);
+            draw_hand(self.minute, 60, 0.8 * radius, offset, path)
+        });
+
+        frame.stroke(
+            &hour_and_minute_hands,
+            canvas::Stroke {
+                width: 6.0,
+                color: Color::WHITE,
+                line_cap: canvas::LineCap::Round,
+                ..canvas::Stroke::default()
+            },
+        );
+
+        let second_hand = canvas::Path::new(|path| {
+            path.move_to(center);
+            draw_hand(self.second, 60, 0.8 * radius, offset, path)
+        });
+
+        frame.stroke(
+            &second_hand,
+            canvas::Stroke {
+                width: 3.0,
+                color: Color::WHITE,
+                line_cap: canvas::LineCap::Round,
+                ..canvas::Stroke::default()
+            },
+        );
+    }
+}
+
+mod time {
+    use iced::futures;
+
+    pub fn every(
+        duration: std::time::Duration,
+    ) -> iced::Subscription<chrono::DateTime<chrono::Local>> {
+        iced::Subscription::from_recipe(Every(duration))
+    }
+
+    struct Every(std::time::Duration);
+
+    impl<H, I> iced_native::subscription::Recipe<H, I> for Every
+    where
+        H: std::hash::Hasher,
+    {
+        type Output = chrono::DateTime<chrono::Local>;
+
+        fn hash(&self, state: &mut H) {
+            use std::hash::Hash;
+
+            std::any::TypeId::of::<Self>().hash(state);
+            self.0.hash(state);
+        }
+
+        fn stream(
+            self: Box<Self>,
+            _input: futures::stream::BoxStream<'static, I>,
+        ) -> futures::stream::BoxStream<'static, Self::Output> {
+            use futures::stream::StreamExt;
+
+            async_std::stream::interval(self.0)
+                .map(|_| chrono::Local::now())
+                .boxed()
+        }
+    }
+}
diff --git a/examples/pane_grid/Cargo.toml b/examples/pane_grid/Cargo.toml
deleted file mode 100644
index 6d8573bd..00000000
--- a/examples/pane_grid/Cargo.toml
+++ /dev/null
@@ -1,12 +0,0 @@
-[package]
-name = "pane_grid"
-version = "0.1.0"
-authors = ["Héctor Ramón Jiménez <hector0193@gmail.com>"]
-edition = "2018"
-publish = false
-
-[dependencies]
-iced = { path = "../..", features = ["async-std"] }
-iced_native = { path = "../../native" }
-clock = { path = "../clock" }
-stopwatch = { path = "../stopwatch" }
diff --git a/examples/pane_grid/README.md b/examples/pane_grid/README.md
deleted file mode 100644
index 4d9fc5b9..00000000
--- a/examples/pane_grid/README.md
+++ /dev/null
@@ -1,18 +0,0 @@
-## Counter
-
-The classic counter example explained in the [`README`](../../README.md).
-
-The __[`main`]__ file contains all the code of the example.
-
-<div align="center">
-  <a href="https://gfycat.com/fairdeadcatbird">
-    <img src="https://thumbs.gfycat.com/FairDeadCatbird-small.gif">
-  </a>
-</div>
-
-You can run it with `cargo run`:
-```
-cargo run --package counter
-```
-
-[`main`]: src/main.rs
diff --git a/examples/pane_grid/src/main.rs b/examples/pane_grid/src/main.rs
deleted file mode 100644
index eb8aaa51..00000000
--- a/examples/pane_grid/src/main.rs
+++ /dev/null
@@ -1,179 +0,0 @@
-use iced::{
-    pane_grid, Application, Command, Element, PaneGrid, Settings, Subscription,
-};
-use iced_native::input::keyboard;
-
-use clock::{self, Clock};
-use stopwatch::{self, Stopwatch};
-
-pub fn main() {
-    Launcher::run(Settings {
-        antialiasing: true,
-        ..Settings::default()
-    })
-}
-
-#[derive(Debug)]
-struct Launcher {
-    panes: pane_grid::State<Example>,
-}
-
-#[derive(Debug)]
-enum Example {
-    Clock(Clock),
-    Stopwatch(Stopwatch),
-}
-
-#[derive(Debug, Clone)]
-enum Message {
-    Clock(pane_grid::Pane, clock::Message),
-    Stopwatch(pane_grid::Pane, stopwatch::Message),
-    Split(pane_grid::Split),
-    Close,
-}
-
-impl Application for Launcher {
-    type Executor = iced::executor::Default;
-    type Message = Message;
-
-    fn new() -> (Self, Command<Message>) {
-        let (clock, _) = Clock::new();
-        let (panes, _) = pane_grid::State::new(Example::Clock(clock));
-
-        (Self { panes }, Command::none())
-    }
-
-    fn title(&self) -> String {
-        String::from("Panes - Iced")
-    }
-
-    fn update(&mut self, message: Message) -> Command<Message> {
-        match message {
-            Message::Clock(pane, message) => {
-                if let Some(Example::Clock(clock)) = self.panes.get_mut(&pane) {
-                    let _ = clock.update(message);
-                }
-            }
-            Message::Stopwatch(pane, message) => {
-                if let Some(Example::Stopwatch(stopwatch)) =
-                    self.panes.get_mut(&pane)
-                {
-                    let _ = stopwatch.update(message);
-                }
-            }
-            Message::Split(kind) => {
-                if let Some(pane) = self.panes.focused_pane() {
-                    let state = if pane.index() % 2 == 0 {
-                        let (stopwatch, _) = Stopwatch::new();
-
-                        Example::Stopwatch(stopwatch)
-                    } else {
-                        let (clock, _) = Clock::new();
-
-                        Example::Clock(clock)
-                    };
-
-                    self.panes.split(kind, &pane, state);
-                }
-            }
-            Message::Close => {
-                if let Some(pane) = self.panes.focused_pane() {
-                    self.panes.close(&pane);
-                }
-            }
-        }
-
-        Command::none()
-    }
-
-    fn subscription(&self) -> Subscription<Message> {
-        let panes_subscriptions =
-            Subscription::batch(self.panes.iter().map(|(pane, example)| {
-                match example {
-                    Example::Clock(clock) => clock
-                        .subscription()
-                        .with(pane)
-                        .map(|(pane, message)| Message::Clock(pane, message)),
-
-                    Example::Stopwatch(stopwatch) => {
-                        stopwatch.subscription().with(pane).map(
-                            |(pane, message)| Message::Stopwatch(pane, message),
-                        )
-                    }
-                }
-            }));
-
-        Subscription::batch(vec![
-            events::key_released(keyboard::KeyCode::H)
-                .map(|_| Message::Split(pane_grid::Split::Horizontal)),
-            events::key_released(keyboard::KeyCode::V)
-                .map(|_| Message::Split(pane_grid::Split::Vertical)),
-            events::key_released(keyboard::KeyCode::Q).map(|_| Message::Close),
-            panes_subscriptions,
-        ])
-    }
-
-    fn view(&mut self) -> Element<Message> {
-        let Self { panes } = self;
-
-        PaneGrid::new(panes, |pane, example, _| match example {
-            Example::Clock(clock) => clock
-                .view()
-                .map(move |message| Message::Clock(pane, message)),
-
-            Example::Stopwatch(stopwatch) => stopwatch
-                .view()
-                .map(move |message| Message::Stopwatch(pane, message)),
-        })
-        .into()
-    }
-}
-
-mod events {
-    use iced_native::{
-        futures::{
-            self,
-            stream::{BoxStream, StreamExt},
-        },
-        input::{keyboard, ButtonState},
-        subscription, Event, Hasher, Subscription,
-    };
-
-    pub fn key_released(key_code: keyboard::KeyCode) -> Subscription<()> {
-        Subscription::from_recipe(KeyReleased { key_code })
-    }
-
-    struct KeyReleased {
-        key_code: keyboard::KeyCode,
-    }
-
-    impl subscription::Recipe<Hasher, Event> for KeyReleased {
-        type Output = ();
-
-        fn hash(&self, state: &mut Hasher) {
-            use std::hash::Hash;
-
-            std::any::TypeId::of::<Self>().hash(state);
-            self.key_code.hash(state);
-        }
-
-        fn stream(
-            self: Box<Self>,
-            events: subscription::EventStream,
-        ) -> BoxStream<'static, Self::Output> {
-            events
-                .filter(move |event| match event {
-                    Event::Keyboard(keyboard::Event::Input {
-                        key_code,
-                        state: ButtonState::Released,
-                        ..
-                    }) if *key_code == self.key_code => {
-                        futures::future::ready(true)
-                    }
-                    _ => futures::future::ready(false),
-                })
-                .map(|_| ())
-                .boxed()
-        }
-    }
-}
diff --git a/examples/stopwatch/src/lib.rs b/examples/stopwatch/src/lib.rs
deleted file mode 100644
index 0219470b..00000000
--- a/examples/stopwatch/src/lib.rs
+++ /dev/null
@@ -1,204 +0,0 @@
-use iced::{
-    button, Align, Application, Button, Column, Command, Container, Element,
-    HorizontalAlignment, Length, Row, Subscription, Text,
-};
-use std::time::{Duration, Instant};
-
-#[derive(Debug)]
-pub struct Stopwatch {
-    duration: Duration,
-    state: State,
-    toggle: button::State,
-    reset: button::State,
-}
-
-#[derive(Debug)]
-enum State {
-    Idle,
-    Ticking { last_tick: Instant },
-}
-
-#[derive(Debug, Clone)]
-pub enum Message {
-    Toggle,
-    Reset,
-    Tick(Instant),
-}
-
-impl Application for Stopwatch {
-    type Executor = iced_futures::executor::AsyncStd;
-    type Message = Message;
-
-    fn new() -> (Stopwatch, Command<Message>) {
-        (
-            Stopwatch {
-                duration: Duration::default(),
-                state: State::Idle,
-                toggle: button::State::new(),
-                reset: button::State::new(),
-            },
-            Command::none(),
-        )
-    }
-
-    fn title(&self) -> String {
-        String::from("Stopwatch - Iced")
-    }
-
-    fn update(&mut self, message: Message) -> Command<Message> {
-        match message {
-            Message::Toggle => match self.state {
-                State::Idle => {
-                    self.state = State::Ticking {
-                        last_tick: Instant::now(),
-                    };
-                }
-                State::Ticking { .. } => {
-                    self.state = State::Idle;
-                }
-            },
-            Message::Tick(now) => match &mut self.state {
-                State::Ticking { last_tick } => {
-                    self.duration += now - *last_tick;
-                    *last_tick = now;
-                }
-                _ => {}
-            },
-            Message::Reset => {
-                self.duration = Duration::default();
-            }
-        }
-
-        Command::none()
-    }
-
-    fn subscription(&self) -> Subscription<Message> {
-        match self.state {
-            State::Idle => Subscription::none(),
-            State::Ticking { .. } => {
-                time::every(Duration::from_millis(10)).map(Message::Tick)
-            }
-        }
-    }
-
-    fn view(&mut self) -> Element<Message> {
-        const MINUTE: u64 = 60;
-        const HOUR: u64 = 60 * MINUTE;
-
-        let seconds = self.duration.as_secs();
-
-        let duration = Text::new(format!(
-            "{:0>2}:{:0>2}:{:0>2}.{:0>2}",
-            seconds / HOUR,
-            (seconds % HOUR) / MINUTE,
-            seconds % MINUTE,
-            self.duration.subsec_millis() / 10,
-        ))
-        .size(40);
-
-        let button = |state, label, style| {
-            Button::new(
-                state,
-                Text::new(label)
-                    .horizontal_alignment(HorizontalAlignment::Center),
-            )
-            .min_width(80)
-            .padding(10)
-            .style(style)
-        };
-
-        let toggle_button = {
-            let (label, color) = match self.state {
-                State::Idle => ("Start", style::Button::Primary),
-                State::Ticking { .. } => ("Stop", style::Button::Destructive),
-            };
-
-            button(&mut self.toggle, label, color).on_press(Message::Toggle)
-        };
-
-        let reset_button =
-            button(&mut self.reset, "Reset", style::Button::Secondary)
-                .on_press(Message::Reset);
-
-        let controls = Row::new()
-            .spacing(20)
-            .push(toggle_button)
-            .push(reset_button);
-
-        let content = Column::new()
-            .align_items(Align::Center)
-            .spacing(20)
-            .push(duration)
-            .push(controls);
-
-        Container::new(content)
-            .width(Length::Fill)
-            .height(Length::Fill)
-            .center_x()
-            .center_y()
-            .into()
-    }
-}
-
-mod time {
-    use iced::futures;
-
-    pub fn every(
-        duration: std::time::Duration,
-    ) -> iced::Subscription<std::time::Instant> {
-        iced::Subscription::from_recipe(Every(duration))
-    }
-
-    struct Every(std::time::Duration);
-
-    impl<H, I> iced_native::subscription::Recipe<H, I> for Every
-    where
-        H: std::hash::Hasher,
-    {
-        type Output = std::time::Instant;
-
-        fn hash(&self, state: &mut H) {
-            use std::hash::Hash;
-
-            std::any::TypeId::of::<Self>().hash(state);
-            self.0.hash(state);
-        }
-
-        fn stream(
-            self: Box<Self>,
-            _input: futures::stream::BoxStream<'static, I>,
-        ) -> futures::stream::BoxStream<'static, Self::Output> {
-            use futures::stream::StreamExt;
-
-            async_std::stream::interval(self.0)
-                .map(|_| std::time::Instant::now())
-                .boxed()
-        }
-    }
-}
-
-mod style {
-    use iced::{button, Background, Color, Vector};
-
-    pub enum Button {
-        Primary,
-        Secondary,
-        Destructive,
-    }
-
-    impl button::StyleSheet for Button {
-        fn active(&self) -> button::Style {
-            button::Style {
-                background: Some(Background::Color(match self {
-                    Button::Primary => Color::from_rgb(0.11, 0.42, 0.87),
-                    Button::Secondary => Color::from_rgb(0.5, 0.5, 0.5),
-                    Button::Destructive => Color::from_rgb(0.8, 0.2, 0.2),
-                })),
-                border_radius: 12,
-                shadow_offset: Vector::new(1.0, 1.0),
-                text_color: Color::WHITE,
-                ..button::Style::default()
-            }
-        }
-    }
-}
diff --git a/examples/stopwatch/src/main.rs b/examples/stopwatch/src/main.rs
index adcdffe4..d84c4817 100644
--- a/examples/stopwatch/src/main.rs
+++ b/examples/stopwatch/src/main.rs
@@ -1,6 +1,206 @@
-use iced::{Application, Settings};
-use stopwatch::Stopwatch;
+use iced::{
+    button, Align, Application, Button, Column, Command, Container, Element,
+    HorizontalAlignment, Length, Row, Settings, Subscription, Text,
+};
+use std::time::{Duration, Instant};
 
 pub fn main() {
     Stopwatch::run(Settings::default())
 }
+
+struct Stopwatch {
+    duration: Duration,
+    state: State,
+    toggle: button::State,
+    reset: button::State,
+}
+
+enum State {
+    Idle,
+    Ticking { last_tick: Instant },
+}
+
+#[derive(Debug, Clone)]
+enum Message {
+    Toggle,
+    Reset,
+    Tick(Instant),
+}
+
+impl Application for Stopwatch {
+    type Executor = iced_futures::executor::AsyncStd;
+    type Message = Message;
+
+    fn new() -> (Stopwatch, Command<Message>) {
+        (
+            Stopwatch {
+                duration: Duration::default(),
+                state: State::Idle,
+                toggle: button::State::new(),
+                reset: button::State::new(),
+            },
+            Command::none(),
+        )
+    }
+
+    fn title(&self) -> String {
+        String::from("Stopwatch - Iced")
+    }
+
+    fn update(&mut self, message: Message) -> Command<Message> {
+        match message {
+            Message::Toggle => match self.state {
+                State::Idle => {
+                    self.state = State::Ticking {
+                        last_tick: Instant::now(),
+                    };
+                }
+                State::Ticking { .. } => {
+                    self.state = State::Idle;
+                }
+            },
+            Message::Tick(now) => match &mut self.state {
+                State::Ticking { last_tick } => {
+                    self.duration += now - *last_tick;
+                    *last_tick = now;
+                }
+                _ => {}
+            },
+            Message::Reset => {
+                self.duration = Duration::default();
+            }
+        }
+
+        Command::none()
+    }
+
+    fn subscription(&self) -> Subscription<Message> {
+        match self.state {
+            State::Idle => Subscription::none(),
+            State::Ticking { .. } => {
+                time::every(Duration::from_millis(10)).map(Message::Tick)
+            }
+        }
+    }
+
+    fn view(&mut self) -> Element<Message> {
+        const MINUTE: u64 = 60;
+        const HOUR: u64 = 60 * MINUTE;
+
+        let seconds = self.duration.as_secs();
+
+        let duration = Text::new(format!(
+            "{:0>2}:{:0>2}:{:0>2}.{:0>2}",
+            seconds / HOUR,
+            (seconds % HOUR) / MINUTE,
+            seconds % MINUTE,
+            self.duration.subsec_millis() / 10,
+        ))
+        .size(40);
+
+        let button = |state, label, style| {
+            Button::new(
+                state,
+                Text::new(label)
+                    .horizontal_alignment(HorizontalAlignment::Center),
+            )
+            .min_width(80)
+            .padding(10)
+            .style(style)
+        };
+
+        let toggle_button = {
+            let (label, color) = match self.state {
+                State::Idle => ("Start", style::Button::Primary),
+                State::Ticking { .. } => ("Stop", style::Button::Destructive),
+            };
+
+            button(&mut self.toggle, label, color).on_press(Message::Toggle)
+        };
+
+        let reset_button =
+            button(&mut self.reset, "Reset", style::Button::Secondary)
+                .on_press(Message::Reset);
+
+        let controls = Row::new()
+            .spacing(20)
+            .push(toggle_button)
+            .push(reset_button);
+
+        let content = Column::new()
+            .align_items(Align::Center)
+            .spacing(20)
+            .push(duration)
+            .push(controls);
+
+        Container::new(content)
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .center_x()
+            .center_y()
+            .into()
+    }
+}
+
+mod time {
+    use iced::futures;
+
+    pub fn every(
+        duration: std::time::Duration,
+    ) -> iced::Subscription<std::time::Instant> {
+        iced::Subscription::from_recipe(Every(duration))
+    }
+
+    struct Every(std::time::Duration);
+
+    impl<H, I> iced_native::subscription::Recipe<H, I> for Every
+    where
+        H: std::hash::Hasher,
+    {
+        type Output = std::time::Instant;
+
+        fn hash(&self, state: &mut H) {
+            use std::hash::Hash;
+
+            std::any::TypeId::of::<Self>().hash(state);
+            self.0.hash(state);
+        }
+
+        fn stream(
+            self: Box<Self>,
+            _input: futures::stream::BoxStream<'static, I>,
+        ) -> futures::stream::BoxStream<'static, Self::Output> {
+            use futures::stream::StreamExt;
+
+            async_std::stream::interval(self.0)
+                .map(|_| std::time::Instant::now())
+                .boxed()
+        }
+    }
+}
+
+mod style {
+    use iced::{button, Background, Color, Vector};
+
+    pub enum Button {
+        Primary,
+        Secondary,
+        Destructive,
+    }
+
+    impl button::StyleSheet for Button {
+        fn active(&self) -> button::Style {
+            button::Style {
+                background: Some(Background::Color(match self {
+                    Button::Primary => Color::from_rgb(0.11, 0.42, 0.87),
+                    Button::Secondary => Color::from_rgb(0.5, 0.5, 0.5),
+                    Button::Destructive => Color::from_rgb(0.8, 0.2, 0.2),
+                })),
+                border_radius: 12,
+                shadow_offset: Vector::new(1.0, 1.0),
+                text_color: Color::WHITE,
+                ..button::Style::default()
+            }
+        }
+    }
+}