Create `iced_widget` subcrate and re-organize the whole codebase

1 files changed, 238 insertions, 0 deletions

diff --git a/widget/src/canvas.rs b/widget/src/canvas.rs
new file mode 100644
index 00000000..171c4534
--- /dev/null
+++ b/widget/src/canvas.rs
@@ -0,0 +1,238 @@
+//! Draw 2D graphics for your users.
+pub mod event;
+
+mod cursor;
+mod program;
+
+pub use cursor::Cursor;
+pub use event::Event;
+pub use program::Program;
+
+pub use crate::graphics::geometry::*;
+pub use crate::renderer::geometry::*;
+
+use crate::core;
+use crate::core::layout::{self, Layout};
+use crate::core::mouse;
+use crate::core::renderer;
+use crate::core::widget::tree::{self, Tree};
+use crate::core::{Clipboard, Element, Shell, Widget};
+use crate::core::{Length, Point, Rectangle, Size, Vector};
+use crate::graphics::geometry;
+
+use std::marker::PhantomData;
+
+/// A widget capable of drawing 2D graphics.
+///
+/// ## Drawing a simple circle
+/// If you want to get a quick overview, here's how we can draw a simple circle:
+///
+/// ```no_run
+/// # use iced_widget::canvas::{self, Canvas, Cursor, Fill, Frame, Geometry, Path, Program};
+/// # use iced_widget::core::{Color, Rectangle};
+/// # use iced_widget::style::Theme;
+/// #
+/// # pub type Renderer = iced_widget::renderer::Renderer<Theme>;
+/// // First, we define the data we need for drawing
+/// #[derive(Debug)]
+/// struct Circle {
+///     radius: f32,
+/// }
+///
+/// // Then, we implement the `Program` trait
+/// impl Program<()> for Circle {
+///     type State = ();
+///
+///     fn draw(&self, _state: &(), renderer: &Renderer, _theme: &Theme, bounds: Rectangle, _cursor: Cursor) -> Vec<Geometry>{
+///         // We prepare a new `Frame`
+///         let mut frame = Frame::new(renderer, bounds.size());
+///
+///         // We create a `Path` representing a simple circle
+///         let circle = Path::circle(frame.center(), self.radius);
+///
+///         // And fill it with some color
+///         frame.fill(&circle, Color::BLACK);
+///
+///         // Finally, we produce the geometry
+///         vec![frame.into_geometry()]
+///     }
+/// }
+///
+/// // Finally, we simply use our `Circle` to create the `Canvas`!
+/// let canvas = Canvas::new(Circle { radius: 50.0 });
+/// ```
+#[derive(Debug)]
+pub struct Canvas<P, Message, Renderer = crate::Renderer>
+where
+    Renderer: geometry::Renderer,
+    P: Program<Message, Renderer>,
+{
+    width: Length,
+    height: Length,
+    program: P,
+    message_: PhantomData<Message>,
+    theme_: PhantomData<Renderer>,
+}
+
+impl<P, Message, Renderer> Canvas<P, Message, Renderer>
+where
+    Renderer: geometry::Renderer,
+    P: Program<Message, Renderer>,
+{
+    const DEFAULT_SIZE: f32 = 100.0;
+
+    /// Creates a new [`Canvas`].
+    pub fn new(program: P) -> Self {
+        Canvas {
+            width: Length::Fixed(Self::DEFAULT_SIZE),
+            height: Length::Fixed(Self::DEFAULT_SIZE),
+            program,
+            message_: PhantomData,
+            theme_: PhantomData,
+        }
+    }
+
+    /// Sets the width of the [`Canvas`].
+    pub fn width(mut self, width: impl Into<Length>) -> Self {
+        self.width = width.into();
+        self
+    }
+
+    /// Sets the height of the [`Canvas`].
+    pub fn height(mut self, height: impl Into<Length>) -> Self {
+        self.height = height.into();
+        self
+    }
+}
+
+impl<P, Message, Renderer> Widget<Message, Renderer>
+    for Canvas<P, Message, Renderer>
+where
+    Renderer: geometry::Renderer,
+    P: Program<Message, Renderer>,
+{
+    fn tag(&self) -> tree::Tag {
+        struct Tag<T>(T);
+        tree::Tag::of::<Tag<P::State>>()
+    }
+
+    fn state(&self) -> tree::State {
+        tree::State::new(P::State::default())
+    }
+
+    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 on_event(
+        &mut self,
+        tree: &mut Tree,
+        event: core::Event,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        _renderer: &Renderer,
+        _clipboard: &mut dyn Clipboard,
+        shell: &mut Shell<'_, Message>,
+    ) -> event::Status {
+        let bounds = layout.bounds();
+
+        let canvas_event = match event {
+            core::Event::Mouse(mouse_event) => Some(Event::Mouse(mouse_event)),
+            core::Event::Touch(touch_event) => Some(Event::Touch(touch_event)),
+            core::Event::Keyboard(keyboard_event) => {
+                Some(Event::Keyboard(keyboard_event))
+            }
+            _ => None,
+        };
+
+        let cursor = Cursor::from_window_position(cursor_position);
+
+        if let Some(canvas_event) = canvas_event {
+            let state = tree.state.downcast_mut::<P::State>();
+
+            let (event_status, message) =
+                self.program.update(state, canvas_event, bounds, cursor);
+
+            if let Some(message) = message {
+                shell.publish(message);
+            }
+
+            return event_status;
+        }
+
+        event::Status::Ignored
+    }
+
+    fn mouse_interaction(
+        &self,
+        tree: &Tree,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        _viewport: &Rectangle,
+        _renderer: &Renderer,
+    ) -> mouse::Interaction {
+        let bounds = layout.bounds();
+        let cursor = Cursor::from_window_position(cursor_position);
+        let state = tree.state.downcast_ref::<P::State>();
+
+        self.program.mouse_interaction(state, bounds, cursor)
+    }
+
+    fn draw(
+        &self,
+        tree: &Tree,
+        renderer: &mut Renderer,
+        theme: &Renderer::Theme,
+        _style: &renderer::Style,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        _viewport: &Rectangle,
+    ) {
+        let bounds = layout.bounds();
+
+        if bounds.width < 1.0 || bounds.height < 1.0 {
+            return;
+        }
+
+        let cursor = Cursor::from_window_position(cursor_position);
+        let state = tree.state.downcast_ref::<P::State>();
+
+        renderer.with_translation(
+            Vector::new(bounds.x, bounds.y),
+            |renderer| {
+                renderer.draw(
+                    self.program.draw(state, renderer, theme, bounds, cursor),
+                );
+            },
+        );
+    }
+}
+
+impl<'a, P, Message, Renderer> From<Canvas<P, Message, Renderer>>
+    for Element<'a, Message, Renderer>
+where
+    Message: 'a,
+    Renderer: 'a + geometry::Renderer,
+    P: Program<Message, Renderer> + 'a,
+{
+    fn from(
+        canvas: Canvas<P, Message, Renderer>,
+    ) -> Element<'a, Message, Renderer> {
+        Element::new(canvas)
+    }
+}