Implement theme styling for ProgressBar

native/src/widget/progress_bar.rs

@@ -5,13 +5,13 @@ use crate::{Color, Element, Layout, Length, Point, Rectangle, Size, Widget};
 
 use std::ops::RangeInclusive;
 
-pub use iced_style::progress_bar::{Style, StyleSheet};
+pub use iced_style::progress_bar::{Appearance, StyleSheet};
 
 /// A bar that displays progress.
 ///
 /// # Example
 /// ```
-/// # use iced_native::widget::ProgressBar;
+/// # type ProgressBar = iced_native::widget::ProgressBar<iced_native::renderer::Null>;
 /// let value = 50.0;
 ///
 /// ProgressBar::new(0.0..=100.0, value);
@@ -19,15 +19,23 @@ pub use iced_style::progress_bar::{Style, StyleSheet};
 ///
 /// ![Progress bar drawn with `iced_wgpu`](https://user-images.githubusercontent.com/18618951/71662391-a316c200-2d51-11ea-9cef-52758cab85e3.png)
 #[allow(missing_debug_implementations)]
-pub struct ProgressBar<'a> {
+pub struct ProgressBar<Renderer>
+where
+    Renderer: crate::Renderer,
+    Renderer::Theme: StyleSheet,
+{
     range: RangeInclusive<f32>,
     value: f32,
     width: Length,
     height: Option<Length>,
-    style_sheet: Box<dyn StyleSheet + 'a>,
+    style: <Renderer::Theme as StyleSheet>::Style,
 }
 
-impl<'a> ProgressBar<'a> {
+impl<Renderer> ProgressBar<Renderer>
+where
+    Renderer: crate::Renderer,
+    Renderer::Theme: StyleSheet,
+{
     /// The default height of a [`ProgressBar`].
     pub const DEFAULT_HEIGHT: u16 = 30;
 
@@ -42,7 +50,7 @@ impl<'a> ProgressBar<'a> {
             range,
             width: Length::Fill,
             height: None,
-            style_sheet: Default::default(),
+            style: Default::default(),
         }
     }
 
@@ -61,16 +69,17 @@ impl<'a> ProgressBar<'a> {
     /// Sets the style of the [`ProgressBar`].
     pub fn style(
         mut self,
-        style_sheet: impl Into<Box<dyn StyleSheet + 'a>>,
+        style: impl Into<<Renderer::Theme as StyleSheet>::Style>,
     ) -> Self {
-        self.style_sheet = style_sheet.into();
+        self.style = style.into();
         self
     }
 }
 
-impl<'a, Message, Renderer> Widget<Message, Renderer> for ProgressBar<'a>
+impl<'a, Message, Renderer> Widget<Message, Renderer> for ProgressBar<Renderer>
 where
     Renderer: crate::Renderer,
+    Renderer::Theme: StyleSheet,
 {
     fn width(&self) -> Length {
         self.width
@@ -113,7 +122,7 @@ where
                 / (range_end - range_start)
         };
 
-        let style = self.style_sheet.style();
+        let style = theme.appearance(self.style);
 
         renderer.fill_quad(
             renderer::Quad {
@@ -142,13 +151,16 @@ where
     }
 }
 
-impl<'a, Message, Renderer> From<ProgressBar<'a>>
+impl<'a, Message, Renderer> From<ProgressBar<Renderer>>
     for Element<'a, Message, Renderer>
 where
-    Renderer: 'a + crate::Renderer,
     Message: 'a,
+    Renderer: 'a + crate::Renderer,
+    Renderer::Theme: StyleSheet,
 {
-    fn from(progress_bar: ProgressBar<'a>) -> Element<'a, Message, Renderer> {
+    fn from(
+        progress_bar: ProgressBar<Renderer>,
+    ) -> Element<'a, Message, Renderer> {
         Element::new(progress_bar)
     }
 }