Implement pure version of ProgressBar widget

pure/src/widget.rs

@@ -1,4 +1,5 @@
 pub mod image;
+pub mod progress_bar;
 pub mod rule;
 pub mod tree;
 
@@ -24,6 +25,7 @@ pub use container::Container;
 pub use element::Element;
 pub use image::Image;
 pub use pick_list::PickList;
+pub use progress_bar::ProgressBar;
 pub use radio::Radio;
 pub use row::Row;
 pub use rule::Rule;
@@ -43,6 +45,7 @@ use iced_native::renderer;
 use iced_native::{Clipboard, Length, Point, Rectangle, Shell};
 
 use std::borrow::Cow;
+use std::ops::RangeInclusive;
 
 pub trait Widget<Message, Renderer> {
     fn width(&self) -> Length;
@@ -246,3 +249,15 @@ pub fn horizontal_rule<'a>(height: u16) -> Rule<'a> {
 pub fn vertical_rule<'a>(width: u16) -> Rule<'a> {
     Rule::horizontal(width)
 }
+
+/// Creates a new [`ProgressBar`].
+///
+/// It expects:
+///   * an inclusive range of possible values
+///   * the current value of the [`ProgressBar`]
+pub fn progress_bar<'a>(
+    range: RangeInclusive<f32>,
+    value: f32,
+) -> ProgressBar<'a> {
+    ProgressBar::new(range, value)
+}

pure/src/widget/progress_bar.rs

@@ -0,0 +1,99 @@
+use crate::{Element, Tree, Widget};
+
+use iced_native::event::{self, Event};
+use iced_native::layout::{self, Layout};
+use iced_native::mouse;
+use iced_native::renderer;
+use iced_native::{Clipboard, Length, Point, Rectangle, Shell};
+
+pub use iced_native::widget::progress_bar::*;
+
+impl<'a, Message, Renderer> Widget<Message, Renderer> for ProgressBar<'a>
+where
+    Renderer: iced_native::Renderer,
+{
+    fn width(&self) -> Length {
+        <Self as iced_native::Widget<Message, Renderer>>::width(self)
+    }
+
+    fn height(&self) -> Length {
+        <Self as iced_native::Widget<Message, Renderer>>::height(self)
+    }
+
+    fn layout(
+        &self,
+        renderer: &Renderer,
+        limits: &layout::Limits,
+    ) -> layout::Node {
+        <Self as iced_native::Widget<Message, Renderer>>::layout(
+            self, renderer, limits,
+        )
+    }
+
+    fn on_event(
+        &mut self,
+        _state: &mut Tree,
+        event: Event,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        renderer: &Renderer,
+        clipboard: &mut dyn Clipboard,
+        shell: &mut Shell<'_, Message>,
+    ) -> event::Status {
+        <Self as iced_native::Widget<Message, Renderer>>::on_event(
+            self,
+            event,
+            layout,
+            cursor_position,
+            renderer,
+            clipboard,
+            shell,
+        )
+    }
+
+    fn draw(
+        &self,
+        _tree: &Tree,
+        renderer: &mut Renderer,
+        style: &renderer::Style,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        viewport: &Rectangle,
+    ) {
+        <Self as iced_native::Widget<Message, Renderer>>::draw(
+            self,
+            renderer,
+            style,
+            layout,
+            cursor_position,
+            viewport,
+        )
+    }
+
+    fn mouse_interaction(
+        &self,
+        _state: &Tree,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        viewport: &Rectangle,
+        renderer: &Renderer,
+    ) -> mouse::Interaction {
+        <Self as iced_native::Widget<Message, Renderer>>::mouse_interaction(
+            self,
+            layout,
+            cursor_position,
+            viewport,
+            renderer,
+        )
+    }
+}
+
+impl<'a, Message, Renderer> Into<Element<'a, Message, Renderer>>
+    for ProgressBar<'a>
+where
+    Renderer: iced_native::Renderer + 'a,
+{
+    fn into(self) -> Element<'a, Message, Renderer> {
+        Element::new(self)
+    }
+}