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

1 files changed, 195 insertions, 0 deletions

diff --git a/widget/src/svg.rs b/widget/src/svg.rs
new file mode 100644
index 00000000..89017fcf
--- /dev/null
+++ b/widget/src/svg.rs
@@ -0,0 +1,195 @@
+//! Display vector graphics in your application.
+use crate::core::layout;
+use crate::core::renderer;
+use crate::core::svg;
+use crate::core::widget::Tree;
+use crate::core::{
+    ContentFit, Element, Layout, Length, Point, Rectangle, Size, Vector, Widget,
+};
+
+use std::path::PathBuf;
+
+pub use crate::style::svg::{Appearance, StyleSheet};
+pub use svg::Handle;
+
+/// A vector graphics image.
+///
+/// An [`Svg`] image resizes smoothly without losing any quality.
+///
+/// [`Svg`] images can have a considerable rendering cost when resized,
+/// specially when they are complex.
+#[allow(missing_debug_implementations)]
+pub struct Svg<Renderer = crate::Renderer>
+where
+    Renderer: svg::Renderer,
+    Renderer::Theme: StyleSheet,
+{
+    handle: Handle,
+    width: Length,
+    height: Length,
+    content_fit: ContentFit,
+    style: <Renderer::Theme as StyleSheet>::Style,
+}
+
+impl<Renderer> Svg<Renderer>
+where
+    Renderer: svg::Renderer,
+    Renderer::Theme: StyleSheet,
+{
+    /// Creates a new [`Svg`] from the given [`Handle`].
+    pub fn new(handle: impl Into<Handle>) -> Self {
+        Svg {
+            handle: handle.into(),
+            width: Length::Fill,
+            height: Length::Shrink,
+            content_fit: ContentFit::Contain,
+            style: Default::default(),
+        }
+    }
+
+    /// Creates a new [`Svg`] that will display the contents of the file at the
+    /// provided path.
+    #[must_use]
+    pub fn from_path(path: impl Into<PathBuf>) -> Self {
+        Self::new(Handle::from_path(path))
+    }
+
+    /// Sets the width of the [`Svg`].
+    #[must_use]
+    pub fn width(mut self, width: impl Into<Length>) -> Self {
+        self.width = width.into();
+        self
+    }
+
+    /// Sets the height of the [`Svg`].
+    #[must_use]
+    pub fn height(mut self, height: impl Into<Length>) -> Self {
+        self.height = height.into();
+        self
+    }
+
+    /// Sets the [`ContentFit`] of the [`Svg`].
+    ///
+    /// Defaults to [`ContentFit::Contain`]
+    #[must_use]
+    pub fn content_fit(self, content_fit: ContentFit) -> Self {
+        Self {
+            content_fit,
+            ..self
+        }
+    }
+
+    /// Sets the style variant of this [`Svg`].
+    #[must_use]
+    pub fn style(
+        mut self,
+        style: <Renderer::Theme as StyleSheet>::Style,
+    ) -> Self {
+        self.style = style;
+        self
+    }
+}
+
+impl<Message, Renderer> Widget<Message, Renderer> for Svg<Renderer>
+where
+    Renderer: svg::Renderer,
+    Renderer::Theme: iced_style::svg::StyleSheet,
+{
+    fn width(&self) -> Length {
+        self.width
+    }
+
+    fn height(&self) -> Length {
+        self.height
+    }
+
+    fn layout(
+        &self,
+        renderer: &Renderer,
+        limits: &layout::Limits,
+    ) -> layout::Node {
+        // The raw w/h of the underlying image
+        let Size { width, height } = renderer.dimensions(&self.handle);
+        let image_size = Size::new(width as f32, height as f32);
+
+        // The size to be available to the widget prior to `Shrink`ing
+        let raw_size = limits
+            .width(self.width)
+            .height(self.height)
+            .resolve(image_size);
+
+        // The uncropped size of the image when fit to the bounds above
+        let full_size = self.content_fit.fit(image_size, raw_size);
+
+        // Shrink the widget to fit the resized image, if requested
+        let final_size = Size {
+            width: match self.width {
+                Length::Shrink => f32::min(raw_size.width, full_size.width),
+                _ => raw_size.width,
+            },
+            height: match self.height {
+                Length::Shrink => f32::min(raw_size.height, full_size.height),
+                _ => raw_size.height,
+            },
+        };
+
+        layout::Node::new(final_size)
+    }
+
+    fn draw(
+        &self,
+        _state: &Tree,
+        renderer: &mut Renderer,
+        theme: &Renderer::Theme,
+        _style: &renderer::Style,
+        layout: Layout<'_>,
+        _cursor_position: Point,
+        _viewport: &Rectangle,
+    ) {
+        let Size { width, height } = renderer.dimensions(&self.handle);
+        let image_size = Size::new(width as f32, height as f32);
+
+        let bounds = layout.bounds();
+        let adjusted_fit = self.content_fit.fit(image_size, bounds.size());
+
+        let render = |renderer: &mut Renderer| {
+            let offset = Vector::new(
+                (bounds.width - adjusted_fit.width).max(0.0) / 2.0,
+                (bounds.height - adjusted_fit.height).max(0.0) / 2.0,
+            );
+
+            let drawing_bounds = Rectangle {
+                width: adjusted_fit.width,
+                height: adjusted_fit.height,
+                ..bounds
+            };
+
+            let appearance = theme.appearance(&self.style);
+
+            renderer.draw(
+                self.handle.clone(),
+                appearance.color,
+                drawing_bounds + offset,
+            );
+        };
+
+        if adjusted_fit.width > bounds.width
+            || adjusted_fit.height > bounds.height
+        {
+            renderer.with_layer(bounds, render);
+        } else {
+            render(renderer);
+        }
+    }
+}
+
+impl<'a, Message, Renderer> From<Svg<Renderer>>
+    for Element<'a, Message, Renderer>
+where
+    Renderer: svg::Renderer + 'a,
+    Renderer::Theme: iced_style::svg::StyleSheet,
+{
+    fn from(icon: Svg<Renderer>) -> Element<'a, Message, Renderer> {
+        Element::new(icon)
+    }
+}