Draft first working version of `iced_glow` :tada:

10 files changed, 328 insertions, 0 deletions

diff --git a/glow/src/widget/button.rs b/glow/src/widget/button.rs
new file mode 100644
index 00000000..b738c55e
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+++ b/glow/src/widget/button.rs
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+//! Allow your users to perform actions by pressing a button.
+//!
+//! A [`Button`] has some local [`State`].
+//!
+//! [`Button`]: type.Button.html
+//! [`State`]: struct.State.html
+use crate::Renderer;
+
+pub use iced_native::button::State;
+pub use iced_style::button::{Style, StyleSheet};
+
+/// A widget that produces a message when clicked.
+///
+/// This is an alias of an `iced_native` button with an `iced_wgpu::Renderer`.
+pub type Button<'a, Message> = iced_native::Button<'a, Message, Renderer>;
diff --git a/glow/src/widget/canvas.rs b/glow/src/widget/canvas.rs
new file mode 100644
index 00000000..325f90ce
--- /dev/null
+++ b/glow/src/widget/canvas.rs
@@ -0,0 +1,201 @@
+//! Draw 2D graphics for your users.
+//!
+//! A [`Canvas`] widget can be used to draw different kinds of 2D shapes in a
+//! [`Frame`]. It can be used for animation, data visualization, game graphics,
+//! and more!
+//!
+//! [`Canvas`]: struct.Canvas.html
+//! [`Frame`]: struct.Frame.html
+use crate::{Defaults, Primitive, Renderer};
+
+use iced_native::{
+    layout, Element, Hasher, Layout, Length, MouseCursor, Point, Size, Widget,
+};
+use std::hash::Hash;
+
+pub mod layer;
+pub mod path;
+
+mod drawable;
+mod fill;
+mod frame;
+mod stroke;
+mod text;
+
+pub use drawable::Drawable;
+pub use fill::Fill;
+pub use frame::Frame;
+pub use layer::Layer;
+pub use path::Path;
+pub use stroke::{LineCap, LineJoin, Stroke};
+pub use text::Text;
+
+/// A widget capable of drawing 2D graphics.
+///
+/// A [`Canvas`] may contain multiple layers. A [`Layer`] is drawn using the
+/// painter's algorithm. In other words, layers will be drawn on top of each
+/// other in the same order they are pushed into the [`Canvas`].
+///
+/// [`Canvas`]: struct.Canvas.html
+/// [`Layer`]: layer/trait.Layer.html
+///
+/// # Examples
+/// The repository has a couple of [examples] showcasing how to use a
+/// [`Canvas`]:
+///
+/// - [`clock`], an application that uses the [`Canvas`] widget to draw a clock
+/// and its hands to display the current time.
+/// - [`solar_system`], an animated solar system drawn using the [`Canvas`] widget
+/// and showcasing how to compose different transforms.
+///
+/// [examples]: https://github.com/hecrj/iced/tree/0.1/examples
+/// [`clock`]: https://github.com/hecrj/iced/tree/0.1/examples/clock
+/// [`solar_system`]: https://github.com/hecrj/iced/tree/0.1/examples/solar_system
+///
+/// ## Drawing a simple circle
+/// If you want to get a quick overview, here's how we can draw a simple circle:
+///
+/// ```no_run
+/// # mod iced {
+/// #     pub use iced_wgpu::canvas;
+/// #     pub use iced_native::Color;
+/// # }
+/// use iced::canvas::{self, layer, Canvas, Drawable, Fill, Frame, Path};
+/// use iced::Color;
+///
+/// // First, we define the data we need for drawing
+/// #[derive(Debug)]
+/// struct Circle {
+///     radius: f32,
+/// }
+///
+/// // Then, we implement the `Drawable` trait
+/// impl Drawable for Circle {
+///     fn draw(&self, frame: &mut Frame) {
+///         // We create a `Path` representing a simple circle
+///         let circle = Path::new(|p| p.circle(frame.center(), self.radius));
+///
+///         // And fill it with some color
+///         frame.fill(&circle, Fill::Color(Color::BLACK));
+///     }
+/// }
+///
+/// // We can use a `Cache` to avoid unnecessary re-tessellation
+/// let cache: layer::Cache<Circle> = layer::Cache::new();
+///
+/// // Finally, we simply provide the data to our `Cache` and push the resulting
+/// // layer into a `Canvas`
+/// let canvas = Canvas::new()
+///     .push(cache.with(&Circle { radius: 50.0 }));
+/// ```
+#[derive(Debug)]
+pub struct Canvas<'a> {
+    width: Length,
+    height: Length,
+    layers: Vec<Box<dyn Layer + 'a>>,
+}
+
+impl<'a> Canvas<'a> {
+    const DEFAULT_SIZE: u16 = 100;
+
+    /// Creates a new [`Canvas`] with no layers.
+    ///
+    /// [`Canvas`]: struct.Canvas.html
+    pub fn new() -> Self {
+        Canvas {
+            width: Length::Units(Self::DEFAULT_SIZE),
+            height: Length::Units(Self::DEFAULT_SIZE),
+            layers: Vec::new(),
+        }
+    }
+
+    /// Sets the width of the [`Canvas`].
+    ///
+    /// [`Canvas`]: struct.Canvas.html
+    pub fn width(mut self, width: Length) -> Self {
+        self.width = width;
+        self
+    }
+
+    /// Sets the height of the [`Canvas`].
+    ///
+    /// [`Canvas`]: struct.Canvas.html
+    pub fn height(mut self, height: Length) -> Self {
+        self.height = height;
+        self
+    }
+
+    /// Adds a [`Layer`] to the [`Canvas`].
+    ///
+    /// It will be drawn on top of previous layers.
+    ///
+    /// [`Layer`]: layer/trait.Layer.html
+    /// [`Canvas`]: struct.Canvas.html
+    pub fn push(mut self, layer: impl Layer + 'a) -> Self {
+        self.layers.push(Box::new(layer));
+        self
+    }
+}
+
+impl<'a, Message> Widget<Message, Renderer> for Canvas<'a> {
+    fn width(&self) -> Length {
+        self.width
+    }
+
+    fn height(&self) -> Length {
+        self.height
+    }
+
+    fn layout(
+        &self,
+        _renderer: &Renderer,
+        limits: &layout::Limits,
+    ) -> layout::Node {
+        let limits = limits.width(self.width).height(self.height);
+        let size = limits.resolve(Size::ZERO);
+
+        layout::Node::new(size)
+    }
+
+    fn draw(
+        &self,
+        _renderer: &mut Renderer,
+        _defaults: &Defaults,
+        layout: Layout<'_>,
+        _cursor_position: Point,
+    ) -> (Primitive, MouseCursor) {
+        let bounds = layout.bounds();
+        let origin = Point::new(bounds.x, bounds.y);
+        let size = Size::new(bounds.width, bounds.height);
+
+        (
+            Primitive::Group {
+                primitives: self
+                    .layers
+                    .iter()
+                    .map(|layer| Primitive::Cached {
+                        origin,
+                        cache: layer.draw(size),
+                    })
+                    .collect(),
+            },
+            MouseCursor::Idle,
+        )
+    }
+
+    fn hash_layout(&self, state: &mut Hasher) {
+        std::any::TypeId::of::<Canvas<'static>>().hash(state);
+
+        self.width.hash(state);
+        self.height.hash(state);
+    }
+}
+
+impl<'a, Message> From<Canvas<'a>> for Element<'a, Message, Renderer>
+where
+    Message: 'static,
+{
+    fn from(canvas: Canvas<'a>) -> Element<'a, Message, Renderer> {
+        Element::new(canvas)
+    }
+}
diff --git a/glow/src/widget/checkbox.rs b/glow/src/widget/checkbox.rs
new file mode 100644
index 00000000..da0d7a84
--- /dev/null
+++ b/glow/src/widget/checkbox.rs
@@ -0,0 +1,9 @@
+//! Show toggle controls using checkboxes.
+use crate::Renderer;
+
+pub use iced_style::checkbox::{Style, StyleSheet};
+
+/// A box that can be checked.
+///
+/// This is an alias of an `iced_native` checkbox with an `iced_wgpu::Renderer`.
+pub type Checkbox<Message> = iced_native::Checkbox<Message, Renderer>;
diff --git a/glow/src/widget/container.rs b/glow/src/widget/container.rs
new file mode 100644
index 00000000..9a93a246
--- /dev/null
+++ b/glow/src/widget/container.rs
@@ -0,0 +1,10 @@
+//! Decorate content and apply alignment.
+use crate::Renderer;
+
+pub use iced_style::container::{Style, StyleSheet};
+
+/// An element decorating some content.
+///
+/// This is an alias of an `iced_native` container with a default
+/// `Renderer`.
+pub type Container<'a, Message> = iced_native::Container<'a, Message, Renderer>;
diff --git a/glow/src/widget/pane_grid.rs b/glow/src/widget/pane_grid.rs
new file mode 100644
index 00000000..578e8960
--- /dev/null
+++ b/glow/src/widget/pane_grid.rs
@@ -0,0 +1,24 @@
+//! Let your users split regions of your application and organize layout dynamically.
+//!
+//! [![Pane grid - Iced](https://thumbs.gfycat.com/MixedFlatJellyfish-small.gif)](https://gfycat.com/mixedflatjellyfish)
+//!
+//! # Example
+//! The [`pane_grid` example] showcases how to use a [`PaneGrid`] with resizing,
+//! drag and drop, and hotkey support.
+//!
+//! [`pane_grid` example]: https://github.com/hecrj/iced/tree/0.1/examples/pane_grid
+//! [`PaneGrid`]: type.PaneGrid.html
+use crate::Renderer;
+
+pub use iced_native::pane_grid::{
+    Axis, Direction, DragEvent, Focus, KeyPressEvent, Pane, ResizeEvent, Split,
+    State,
+};
+
+/// A collection of panes distributed using either vertical or horizontal splits
+/// to completely fill the space available.
+///
+/// [![Pane grid - Iced](https://thumbs.gfycat.com/MixedFlatJellyfish-small.gif)](https://gfycat.com/mixedflatjellyfish)
+///
+/// This is an alias of an `iced_native` pane grid with an `iced_wgpu::Renderer`.
+pub type PaneGrid<'a, Message> = iced_native::PaneGrid<'a, Message, Renderer>;
diff --git a/glow/src/widget/progress_bar.rs b/glow/src/widget/progress_bar.rs
new file mode 100644
index 00000000..34450b5e
--- /dev/null
+++ b/glow/src/widget/progress_bar.rs
@@ -0,0 +1,15 @@
+//! Allow your users to perform actions by pressing a button.
+//!
+//! A [`Button`] has some local [`State`].
+//!
+//! [`Button`]: type.Button.html
+//! [`State`]: struct.State.html
+use crate::Renderer;
+
+pub use iced_style::progress_bar::{Style, StyleSheet};
+
+/// A bar that displays progress.
+///
+/// This is an alias of an `iced_native` progress bar with an
+/// `iced_wgpu::Renderer`.
+pub type ProgressBar = iced_native::ProgressBar<Renderer>;
diff --git a/glow/src/widget/radio.rs b/glow/src/widget/radio.rs
new file mode 100644
index 00000000..6e5cf042
--- /dev/null
+++ b/glow/src/widget/radio.rs
@@ -0,0 +1,10 @@
+//! Create choices using radio buttons.
+use crate::Renderer;
+
+pub use iced_style::radio::{Style, StyleSheet};
+
+/// A circular button representing a choice.
+///
+/// This is an alias of an `iced_native` radio button with an
+/// `iced_wgpu::Renderer`.
+pub type Radio<Message> = iced_native::Radio<Message, Renderer>;
diff --git a/glow/src/widget/scrollable.rs b/glow/src/widget/scrollable.rs
new file mode 100644
index 00000000..1d236105
--- /dev/null
+++ b/glow/src/widget/scrollable.rs
@@ -0,0 +1,13 @@
+//! Navigate an endless amount of content with a scrollbar.
+use crate::Renderer;
+
+pub use iced_native::scrollable::State;
+pub use iced_style::scrollable::{Scrollbar, Scroller, StyleSheet};
+
+/// A widget that can vertically display an infinite amount of content
+/// with a scrollbar.
+///
+/// This is an alias of an `iced_native` scrollable with a default
+/// `Renderer`.
+pub type Scrollable<'a, Message> =
+    iced_native::Scrollable<'a, Message, Renderer>;
diff --git a/glow/src/widget/slider.rs b/glow/src/widget/slider.rs
new file mode 100644
index 00000000..4e47978f
--- /dev/null
+++ b/glow/src/widget/slider.rs
@@ -0,0 +1,16 @@
+//! Display an interactive selector of a single value from a range of values.
+//!
+//! A [`Slider`] has some local [`State`].
+//!
+//! [`Slider`]: struct.Slider.html
+//! [`State`]: struct.State.html
+use crate::Renderer;
+
+pub use iced_native::slider::State;
+pub use iced_style::slider::{Handle, HandleShape, Style, StyleSheet};
+
+/// An horizontal bar and a handle that selects a single value from a range of
+/// values.
+///
+/// This is an alias of an `iced_native` slider with an `iced_wgpu::Renderer`.
+pub type Slider<'a, Message> = iced_native::Slider<'a, Message, Renderer>;
diff --git a/glow/src/widget/text_input.rs b/glow/src/widget/text_input.rs
new file mode 100644
index 00000000..260fe3a6
--- /dev/null
+++ b/glow/src/widget/text_input.rs
@@ -0,0 +1,15 @@
+//! Display fields that can be filled with text.
+//!
+//! A [`TextInput`] has some local [`State`].
+//!
+//! [`TextInput`]: struct.TextInput.html
+//! [`State`]: struct.State.html
+use crate::Renderer;
+
+pub use iced_native::text_input::State;
+pub use iced_style::text_input::{Style, StyleSheet};
+
+/// A field that can be filled with text.
+///
+/// This is an alias of an `iced_native` text input with an `iced_wgpu::Renderer`.
+pub type TextInput<'a, Message> = iced_native::TextInput<'a, Message, Renderer>;