Merge branch 'master' into fear/linear-gradients

14 files changed, 257 insertions, 12 deletions

diff --git a/Cargo.toml b/Cargo.toml
index e4754782..e72d9152 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -72,6 +72,7 @@ members = [
     "examples/integration_opengl",
     "examples/integration_wgpu",
     "examples/modern_art",
+    "examples/multitouch",
     "examples/pane_grid",
     "examples/pick_list",
     "examples/pokedex",
diff --git a/README.md b/README.md
index 5e52234e..dc065ada 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@
 [![Crates.io](https://img.shields.io/crates/v/iced.svg)](https://crates.io/crates/iced)
 [![License](https://img.shields.io/crates/l/iced.svg)](https://github.com/iced-rs/iced/blob/master/LICENSE)
 [![Downloads](https://img.shields.io/crates/d/iced.svg)](https://crates.io/crates/iced)
-[![Test Status](https://github.com/iced-rs/iced/workflows/Test/badge.svg?event=push)](https://github.com/iced-rs/iced/actions)
+[![Test Status](https://img.shields.io/github/workflow/status/iced-rs/iced/Test?event=push&label=test)](https://github.com/iced-rs/iced/actions)
 [![Discord Server](https://img.shields.io/discord/628993209984614400?label=&labelColor=6A7EC2&logo=discord&logoColor=ffffff&color=7389D8)](https://discord.gg/3xZJ65GAhd)
 
 A cross-platform GUI library for Rust focused on simplicity and type-safety.
diff --git a/examples/game_of_life/src/main.rs b/examples/game_of_life/src/main.rs
index a2030275..2a8b3721 100644
--- a/examples/game_of_life/src/main.rs
+++ b/examples/game_of_life/src/main.rs
@@ -204,6 +204,7 @@ fn view_controls<'a>(
 
 mod grid {
     use crate::Preset;
+    use iced::touch;
     use iced::widget::canvas;
     use iced::widget::canvas::event::{self, Event};
     use iced::widget::canvas::{
@@ -423,6 +424,19 @@ mod grid {
             };
 
             match event {
+                Event::Touch(touch::Event::FingerMoved { .. }) => {
+                    let message = {
+                        *interaction = if is_populated {
+                            Interaction::Erasing
+                        } else {
+                            Interaction::Drawing
+                        };
+
+                        populate.or(unpopulate)
+                    };
+
+                    (event::Status::Captured, message)
+                }
                 Event::Mouse(mouse_event) => match mouse_event {
                     mouse::Event::ButtonPressed(button) => {
                         let message = match button {
diff --git a/examples/multitouch/Cargo.toml b/examples/multitouch/Cargo.toml
new file mode 100644
index 00000000..f7c8c145
--- /dev/null
+++ b/examples/multitouch/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "multitouch"
+version = "0.1.0"
+authors = ["Artur Sapek <artur@kraken.com>"]
+edition = "2021"
+publish = false
+
+[dependencies]
+iced = { path = "../..", features = ["canvas", "tokio", "debug"] }
+tokio = { version = "1.0", features = ["sync"] }
+env_logger = "0.9"
+voronator = "0.2"
diff --git a/examples/multitouch/src/main.rs b/examples/multitouch/src/main.rs
new file mode 100644
index 00000000..0345ceb7
--- /dev/null
+++ b/examples/multitouch/src/main.rs
@@ -0,0 +1,199 @@
+//! This example shows how to use touch events in `Canvas` to draw
+//! a circle around each fingertip. This only works on touch-enabled
+//! computers like Microsoft Surface.
+use iced::widget::canvas::event;
+use iced::widget::canvas::{self, Canvas, Cursor, Geometry, Stroke};
+use iced::{
+    executor, touch, window, Application, Color, Command, Element, Length,
+    Point, Rectangle, Settings, Subscription, Theme,
+};
+
+use std::collections::HashMap;
+
+pub fn main() -> iced::Result {
+    env_logger::builder().format_timestamp(None).init();
+
+    Multitouch::run(Settings {
+        antialiasing: true,
+        window: window::Settings {
+            position: window::Position::Centered,
+            ..window::Settings::default()
+        },
+        ..Settings::default()
+    })
+}
+
+struct Multitouch {
+    state: State,
+}
+
+#[derive(Debug)]
+struct State {
+    cache: canvas::Cache,
+    fingers: HashMap<touch::Finger, Point>,
+}
+
+impl State {
+    fn new() -> Self {
+        Self {
+            cache: canvas::Cache::new(),
+            fingers: HashMap::new(),
+        }
+    }
+}
+
+#[derive(Debug)]
+enum Message {
+    FingerPressed { id: touch::Finger, position: Point },
+    FingerLifted { id: touch::Finger },
+}
+
+impl Application for Multitouch {
+    type Executor = executor::Default;
+    type Message = Message;
+    type Theme = Theme;
+    type Flags = ();
+
+    fn new(_flags: ()) -> (Self, Command<Message>) {
+        (
+            Multitouch {
+                state: State::new(),
+            },
+            Command::none(),
+        )
+    }
+
+    fn title(&self) -> String {
+        String::from("Multitouch - Iced")
+    }
+
+    fn update(&mut self, message: Message) -> Command<Message> {
+        match message {
+            Message::FingerPressed { id, position } => {
+                self.state.fingers.insert(id, position);
+                self.state.cache.clear();
+            }
+            Message::FingerLifted { id } => {
+                self.state.fingers.remove(&id);
+                self.state.cache.clear();
+            }
+        }
+
+        Command::none()
+    }
+
+    fn subscription(&self) -> Subscription<Message> {
+        Subscription::none()
+    }
+
+    fn view(&self) -> Element<Message> {
+        Canvas::new(&self.state)
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .into()
+    }
+}
+
+impl canvas::Program<Message> for State {
+    type State = ();
+
+    fn update(
+        &self,
+        _state: &mut Self::State,
+        event: event::Event,
+        _bounds: Rectangle,
+        _cursor: Cursor,
+    ) -> (event::Status, Option<Message>) {
+        match event {
+            event::Event::Touch(touch_event) => match touch_event {
+                touch::Event::FingerPressed { id, position }
+                | touch::Event::FingerMoved { id, position } => (
+                    event::Status::Captured,
+                    Some(Message::FingerPressed { id, position }),
+                ),
+                touch::Event::FingerLifted { id, .. }
+                | touch::Event::FingerLost { id, .. } => (
+                    event::Status::Captured,
+                    Some(Message::FingerLifted { id }),
+                ),
+            },
+            _ => (event::Status::Ignored, None),
+        }
+    }
+
+    fn draw(
+        &self,
+        _state: &Self::State,
+        _theme: &Theme,
+        bounds: Rectangle,
+        _cursor: Cursor,
+    ) -> Vec<Geometry> {
+        let fingerweb = self.cache.draw(bounds.size(), |frame| {
+            if self.fingers.len() < 2 {
+                return;
+            }
+
+            // Collect tuples of (id, point);
+            let mut zones: Vec<(u64, Point)> =
+                self.fingers.iter().map(|(id, pt)| (id.0, *pt)).collect();
+
+            // Sort by ID
+            zones.sort_by(|a, b| a.0.partial_cmp(&b.0).unwrap());
+
+            // Generate sorted list of points
+            let vpoints: Vec<(f64, f64)> = zones
+                .iter()
+                .map(|(_, p)| (f64::from(p.x), f64::from(p.y)))
+                .collect();
+
+            let diagram: voronator::VoronoiDiagram<
+                voronator::delaunator::Point,
+            > = voronator::VoronoiDiagram::from_tuple(
+                &(0.0, 0.0),
+                &(700.0, 700.0),
+                &vpoints,
+            )
+            .expect("Generate Voronoi diagram");
+
+            for (cell, zone) in diagram.cells().iter().zip(zones) {
+                let mut builder = canvas::path::Builder::new();
+
+                for (index, p) in cell.points().iter().enumerate() {
+                    let p = Point::new(p.x as f32, p.y as f32);
+
+                    match index {
+                        0 => builder.move_to(p),
+                        _ => builder.line_to(p),
+                    }
+                }
+
+                let path = builder.build();
+
+                let color_r = (10 % zone.0) as f32 / 20.0;
+                let color_g = (10 % (zone.0 + 8)) as f32 / 20.0;
+                let color_b = (10 % (zone.0 + 3)) as f32 / 20.0;
+
+                frame.fill(
+                    &path,
+                    Color {
+                        r: color_r,
+                        g: color_g,
+                        b: color_b,
+                        a: 1.0,
+                    },
+                );
+
+                frame.stroke(
+                    &path,
+                    Stroke {
+                        color: Color::BLACK,
+                        width: 3.0,
+                        ..Stroke::default()
+                    },
+                );
+            }
+        });
+
+        vec![fingerweb]
+    }
+}
diff --git a/graphics/src/widget/canvas.rs b/graphics/src/widget/canvas.rs
index 36c17906..ea2efcc1 100644
--- a/graphics/src/widget/canvas.rs
+++ b/graphics/src/widget/canvas.rs
@@ -170,6 +170,9 @@ where
             iced_native::Event::Mouse(mouse_event) => {
                 Some(Event::Mouse(mouse_event))
             }
+            iced_native::Event::Touch(touch_event) => {
+                Some(Event::Touch(touch_event))
+            }
             iced_native::Event::Keyboard(keyboard_event) => {
                 Some(Event::Keyboard(keyboard_event))
             }
diff --git a/graphics/src/widget/canvas/event.rs b/graphics/src/widget/canvas/event.rs
index 5bf6f7a6..7c733a4d 100644
--- a/graphics/src/widget/canvas/event.rs
+++ b/graphics/src/widget/canvas/event.rs
@@ -1,6 +1,7 @@
 //! Handle events of a canvas.
 use iced_native::keyboard;
 use iced_native::mouse;
+use iced_native::touch;
 
 pub use iced_native::event::Status;
 
@@ -12,6 +13,9 @@ pub enum Event {
     /// A mouse event.
     Mouse(mouse::Event),
 
+    /// A touch event.
+    Touch(touch::Event),
+
     /// A keyboard event.
     Keyboard(keyboard::Event),
 }
diff --git a/native/src/widget/radio.rs b/native/src/widget/radio.rs
index c9152d05..cb83f745 100644
--- a/native/src/widget/radio.rs
+++ b/native/src/widget/radio.rs
@@ -230,9 +230,9 @@ where
         let mut children = layout.children();
 
         let custom_style = if is_mouse_over {
-            theme.hovered(self.style)
+            theme.hovered(self.style, self.is_selected)
         } else {
-            theme.active(self.style)
+            theme.active(self.style, self.is_selected)
         };
 
         {
diff --git a/src/lib.rs b/src/lib.rs
index 8209952f..b86780f1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -177,6 +177,7 @@ pub mod mouse;
 pub mod overlay;
 pub mod settings;
 pub mod time;
+pub mod touch;
 pub mod widget;
 pub mod window;
 
diff --git a/src/touch.rs b/src/touch.rs
new file mode 100644
index 00000000..0b77c386
--- /dev/null
+++ b/src/touch.rs
@@ -0,0 +1,2 @@
+//! Listen and react to touch events.
+pub use crate::runtime::touch::{Event, Finger};
diff --git a/style/src/radio.rs b/style/src/radio.rs
index a4d4a83b..d14ea33e 100644
--- a/style/src/radio.rs
+++ b/style/src/radio.rs
@@ -15,7 +15,7 @@ pub struct Appearance {
 pub trait StyleSheet {
     type Style: Default + Copy;
 
-    fn active(&self, style: Self::Style) -> Appearance;
+    fn active(&self, style: Self::Style, is_selected: bool) -> Appearance;
 
-    fn hovered(&self, style: Self::Style) -> Appearance;
+    fn hovered(&self, style: Self::Style, is_selected: bool) -> Appearance;
 }
diff --git a/style/src/theme.rs b/style/src/theme.rs
index 9e9abfa0..ea538c3a 100644
--- a/style/src/theme.rs
+++ b/style/src/theme.rs
@@ -415,7 +415,11 @@ impl pick_list::StyleSheet for Theme {
 impl radio::StyleSheet for Theme {
     type Style = ();
 
-    fn active(&self, _style: Self::Style) -> radio::Appearance {
+    fn active(
+        &self,
+        _style: Self::Style,
+        _is_selected: bool,
+    ) -> radio::Appearance {
         let palette = self.extended_palette();
 
         radio::Appearance {
@@ -427,8 +431,12 @@ impl radio::StyleSheet for Theme {
         }
     }
 
-    fn hovered(&self, style: Self::Style) -> radio::Appearance {
-        let active = self.active(style);
+    fn hovered(
+        &self,
+        style: Self::Style,
+        is_selected: bool,
+    ) -> radio::Appearance {
+        let active = self.active(style, is_selected);
         let palette = self.extended_palette();
 
         radio::Appearance {
diff --git a/style/src/toggler.rs b/style/src/toggler.rs
index 4ee7db46..0acf8e97 100644
--- a/style/src/toggler.rs
+++ b/style/src/toggler.rs
@@ -2,7 +2,7 @@
 use iced_core::Color;
 
 /// The appearance of a toggler.
-#[derive(Debug)]
+#[derive(Debug, Clone, Copy)]
 pub struct Appearance {
     pub background: Color,
     pub background_border: Option<Color>,
diff --git a/wgpu/README.md b/wgpu/README.md
index 50440baf..016af179 100644
--- a/wgpu/README.md
+++ b/wgpu/README.md
@@ -4,9 +4,9 @@
 [![License](https://img.shields.io/crates/l/iced_wgpu.svg)](https://github.com/iced-rs/iced/blob/master/LICENSE)
 [![Discord Server](https://img.shields.io/discord/628993209984614400?label=&labelColor=6A7EC2&logo=discord&logoColor=ffffff&color=7389D8)](https://discord.gg/3xZJ65GAhd)
 
-`iced_wgpu` is a [`wgpu`] renderer for [`iced_native`]. For now, it is the default renderer of Iced in native platforms.
+`iced_wgpu` is a [`wgpu`] renderer for [`iced_native`]. For now, it is the default renderer of Iced on [native platforms].
 
-[`wgpu`] supports most modern graphics backends: Vulkan, Metal, DX11, and DX12 (OpenGL and WebGL are still WIP). Additionally, it will support the incoming [WebGPU API].
+[`wgpu`] supports most modern graphics backends: Vulkan, Metal, and DX12 (OpenGL and WebGL are still WIP). Additionally, it will support the incoming [WebGPU API].
 
 Currently, `iced_wgpu` supports the following primitives:
 - Text, which is rendered using [`wgpu_glyph`]. No shaping at all.
@@ -22,6 +22,7 @@ Currently, `iced_wgpu` supports the following primitives:
 [documentation]: https://docs.rs/iced_wgpu
 [`iced_native`]: ../native
 [`wgpu`]: https://github.com/gfx-rs/wgpu
+[native platforms]: https://github.com/gfx-rs/wgpu#supported-platforms
 [WebGPU API]: https://gpuweb.github.io/gpuweb/
 [`wgpu_glyph`]: https://github.com/hecrj/wgpu_glyph
 
@@ -39,7 +40,7 @@ you want to learn about a specific release, check out [the release list].
 
 ## Current limitations
 
-The current implementation is quite naive, it uses:
+The current implementation is quite naive; it uses:
 
 - A different pipeline/shader for each primitive
 - A very simplistic layer model: every `Clip` primitive will generate new layers