migrated Image and ProgressBar widgets

src/widget/progress_bar.rs

@@ -0,0 +1,117 @@
+//! Displays action progress to your users.
+
+use crate::{
+    Style, Node, Element, MouseCursor, Layout, Hasher, Widget,
+    Point, Rectangle,
+};
+
+use std::hash::Hash;
+
+/// A widget that displays a progress of an action.
+/// 
+/// It implements [`Widget`] when the associated [`core::Renderer`] implements
+/// the [`button::Renderer`] trait.
+///
+/// [`Widget`]: ../../core/trait.Widget.html
+/// [`core::Renderer`]: ../../core/trait.Renderer.html
+/// [`progress_bar::Renderer`]: trait.Renderer.html
+/// # Example
+///
+/// ```
+/// use coffee::ui::ProgressBar;
+///
+/// let progress = 0.75;
+///
+/// ProgressBar::new(progress);
+/// ```
+#[derive(Debug)]
+pub struct ProgressBar {
+    progress: f32,
+    style: Style,
+}
+
+impl ProgressBar {
+    /// Creates a new [`ProgressBar`] with given progress.
+    ///
+    /// [`ProgressBar`]: struct.ProgressBar.html
+    pub fn new(progress: f32) -> Self {
+        ProgressBar {
+            progress,
+            style: Style::default().fill_width(),
+        }
+    }
+
+    /// Sets the width of the [`ProgressBar`] in pixels.
+    ///
+    /// [`ProgressBar`]: struct.ProgressBar.html
+    pub fn width(mut self, width: u32) -> Self {
+        self.style = self.style.width(width);
+        self
+    }
+
+    /// Makes the [`ProgressBar`] fill the horizontal space of its container.
+    ///
+    /// [`ProgressBar`]: struct.ProgressBar.html
+    pub fn fill_width(mut self) -> Self {
+        self.style = self.style.fill_width();
+        self
+    }
+}
+
+impl<Message, Renderer> Widget<Message, Renderer> for ProgressBar
+where
+    Renderer: self::Renderer 
+{
+    fn node(&self, _renderer: &Renderer) -> Node {
+        Node::new(self.style.height(50))
+    }
+
+    fn draw(
+        &self,
+        renderer: &mut Renderer,
+        layout: Layout<'_>,
+        _cursor_position: Point,
+    ) -> MouseCursor {
+        renderer.draw(
+            layout.bounds(),
+            self.progress,
+        );
+
+        MouseCursor::OutOfBounds
+    }
+
+    fn hash(&self, state: &mut Hasher) {
+        self.style.hash(state);
+    }
+}
+
+/// The renderer of a [`ProgressBar`].
+///
+/// Your [`core::Renderer`] will need to implement this trait before being
+/// able to use a [`ProgressBar`] in your user interface.
+///
+/// [`ProgressBar`]: struct.ProgressBar.html
+/// [`core::Renderer`]: ../../core/trait.Renderer.html
+pub trait Renderer {
+    /// Draws a [`ProgressBar`].
+    ///
+    /// It receives:
+    ///   * the bounds of the [`ProgressBar`]
+    ///   * the progress of the [`ProgressBar`]
+    ///   
+    /// [`ProgressBar`]: struct.ProgressBar.html
+    fn draw(
+        &mut self,
+        bounds: Rectangle<f32>,
+        progress: f32,
+    );
+}
+
+impl<'a, Message, Renderer> From<ProgressBar> for Element<'a, Message, Renderer>
+where
+    Renderer: self::Renderer,
+{
+    fn from(progress_bar: ProgressBar) -> Element<'a, Message, Renderer> {
+        Element::new(progress_bar)
+    }
+}