add(widget): primitive progressbar widget

wgpu/src/renderer/widget.rs

@@ -2,6 +2,7 @@ mod button;
 mod checkbox;
 mod column;
 mod image;
+mod progressbar;
 mod radio;
 mod row;
 mod scrollable;

wgpu/src/renderer/widget/progressbar.rs

@@ -0,0 +1,43 @@
+use crate::{Primitive, Renderer};
+use iced_native::{progressbar, Background, Color, MouseCursor, Rectangle};
+
+impl progressbar::Renderer for Renderer {
+    fn height(&self) -> u32 {
+        30
+    }
+
+    fn draw(
+        &self,
+        bounds: Rectangle,
+        range: std::ops::RangeInclusive<f32>,
+        value: f32,
+    ) -> Self::Output {
+        let (range_start, range_end) = range.into_inner();
+        let active_progress_width = bounds.width
+            * ((value - range_start) / (range_end - range_start).max(1.0));
+
+        let background = Primitive::Group {
+            primitives: vec![Primitive::Quad {
+                bounds: Rectangle { ..bounds },
+                background: Color::from_rgb(0.6, 0.6, 0.6).into(),
+                border_radius: 5,
+            }],
+        };
+
+        let active_progress = Primitive::Quad {
+            bounds: Rectangle {
+                width: active_progress_width,
+                ..bounds
+            },
+            background: Background::Color([0.0, 0.95, 0.0].into()),
+            border_radius: 4,
+        };
+
+        (
+            Primitive::Group {
+                primitives: vec![background, active_progress],
+            },
+            MouseCursor::OutOfBounds,
+        )
+    }
+}