migrated Image and ProgressBar widgets

src/widget/image.rs

@@ -0,0 +1,139 @@
+//! Displays image to your users.
+
+use crate::{
+    Style, Node, Element, MouseCursor, Layout, Hasher, Widget,
+    Rectangle, Point,
+};
+
+use std::hash::Hash;
+
+/// A widget that displays an image.
+/// 
+/// It implements [`Widget`] when the associated [`core::Renderer`] implements
+/// the [`image::Renderer`] trait.
+///
+/// [`Widget`]: ../../core/trait.Widget.html
+/// [`core::Renderer`]: ../../core/trait.Renderer.html
+/// [`image::Renderer`]: trait.Renderer.html
+/// # Example
+///
+/// ```
+/// use iced::Image;
+///
+/// let image = Image::new("image");
+/// ```
+pub struct Image<I> {
+    image: I,
+    source: Option<Rectangle<u16>>,
+    style: Style,
+}
+
+impl<I> std::fmt::Debug for Image<I> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("Image")
+            .field("source", &self.source)
+            .field("style", &self.style)
+            .finish()
+    }
+}
+
+impl<I> Image<I> {
+    /// Creates a new [`Image`] with given image handle.
+    ///
+    /// [`Image`]: struct.Image.html
+    pub fn new(image: &I) -> Self where I: Clone {
+        Image {
+            image: image.clone(),
+            source: None,
+            style: Style::default().fill_width().fill_height(),
+        }
+    }
+
+    /// Sets the portion of the [`Image`] that we want to draw.
+    /// 
+    /// [`Image`]: struct.Image.html
+    pub fn clip(mut self, source: Rectangle<u16>) -> Self {
+        self.source = Some(source);
+        self
+    }
+
+    /// Sets the width of the [`Image`] boundaries in pixels.
+    ///
+    /// [`Image`]: struct.Image.html
+    pub fn width(mut self, width: u32) -> Self {
+        self.style = self.style.width(width);
+        self
+    }
+
+    /// Sets the height of the [`Image`] boundaries in pixels.
+    ///
+    /// [`Image`]: struct.Image.html
+    pub fn height(mut self, height: u32) -> Self {
+        self.style = self.style.height(height);
+        self
+    }
+}
+
+impl<I, Message, Renderer> Widget<Message, Renderer> for Image<I>
+where
+    Renderer: self::Renderer<I>,
+    I: Clone,
+{
+    fn node(&self, _renderer: &Renderer) -> Node {
+        Node::new(self.style)
+    }
+
+    fn draw(
+        &self,
+        renderer: &mut Renderer,
+        layout: Layout<'_>,
+        _cursor_position: Point,
+    ) -> MouseCursor {
+        renderer.draw(
+            layout.bounds(),
+            self.image.clone(),
+            self.source,
+        );
+
+        MouseCursor::OutOfBounds
+    }
+
+    fn hash(&self, state: &mut Hasher) {
+        self.style.hash(state);
+    }
+}
+
+/// The renderer of a [`Image`].
+///
+/// Your [`core::Renderer`] will need to implement this trait before being
+/// able to use a [`Image`] in your user interface.
+///
+/// [`Image`]: struct.Image.html
+/// [`core::Renderer`]: ../../core/trait.Renderer.html
+pub trait Renderer<I> {
+    /// Draws a [`Image`].
+    ///
+    /// It receives:
+    ///   * the bounds of the [`Image`]
+    ///   * the handle of the loaded [`Image`]
+    ///   * the portion of the image that we wants to draw,
+	///     if not specified, draw entire image
+    ///   
+    /// [`Image`]: struct.Image.html
+    fn draw(
+        &mut self,
+        bounds: Rectangle<f32>,
+        image: I,
+        source: Option<Rectangle<u16>>,
+    );
+}
+
+impl<'a, I, Message, Renderer> From<Image<I>> for Element<'a, Message, Renderer>
+where
+    Renderer: self::Renderer<I>,
+    I: Clone + 'a,
+{
+    fn from(image: Image<I>) -> Element<'a, Message, Renderer> {
+        Element::new(image)
+    }
+}