I love control flow

src/core/position/scroll.rs

@@ -0,0 +1,39 @@
+use crate::prelude::*;
+
+pub struct Scroll {
+    inner: WidgetId,
+    axis: Axis,
+    snap_end: bool,
+    amt: f32,
+    draw_len: f32,
+}
+
+impl Widget for Scroll {
+    fn draw(&mut self, painter: &mut Painter) {
+        let output_len = painter.output_size().axis(self.axis);
+        let container_len = painter.region().axis(self.axis).len();
+        let content_len = painter
+            .len_axis(&self.inner, self.axis)
+            .apply_rest()
+            .within_len(container_len)
+            .to_abs(output_len);
+        let container_len = container_len.to_abs(output_len);
+        self.draw_len = content_len;
+        // let region = UiRegion::FULL.offset(self.amt);
+        // painter.widget_within(&self.inner, region);
+    }
+
+    fn desired_width(&mut self, _: &mut SizeCtx) -> Len {
+        Len::default()
+    }
+
+    fn desired_height(&mut self, _: &mut SizeCtx) -> Len {
+        Len::default()
+    }
+}
+
+impl Scroll {
+    pub fn scroll(&mut self, amt: f32) {
+        self.amt += amt;
+    }
+}