Add in-window menus for Linux and Windows.

crates/bds-ui/src/components/popover.rs

@@ -15,6 +15,7 @@ pub struct Popover<'a, Message, Theme = iced::Theme, Renderer = iced::Renderer>
     is_open: bool,
     on_dismiss: Message,
     gap: f32,
+    align_right: bool,
 }
 
 impl<'a, Message, Theme, Renderer> Popover<'a, Message, Theme, Renderer> {
@@ -30,13 +31,31 @@ impl<'a, Message, Theme, Renderer> Popover<'a, Message, Theme, Renderer> {
             is_open,
             on_dismiss,
             gap: 8.0,
+            align_right: true,
         }
     }
+
+    /// Anchor the popup to the trigger's left edge.
+    pub fn align_left(mut self) -> Self {
+        self.align_right = false;
+        self
+    }
 }
 
-fn popup_position(anchor: Rectangle, popup: Size, viewport: Size, gap: f32) -> Point {
+fn popup_position(
+    anchor: Rectangle,
+    popup: Size,
+    viewport: Size,
+    gap: f32,
+    align_right: bool,
+) -> Point {
     let max_x = (viewport.width - popup.width).max(0.0);
-    let x = (anchor.x + anchor.width - popup.width).clamp(0.0, max_x);
+    let x = if align_right {
+        anchor.x + anchor.width - popup.width
+    } else {
+        anchor.x
+    }
+    .clamp(0.0, max_x);
     let below = anchor.y + anchor.height + gap;
     let y = if below + popup.height <= viewport.height {
         below
@@ -169,6 +188,7 @@ where
                 state: &mut popup_tree[0],
                 on_dismiss: self.on_dismiss.clone(),
                 gap: self.gap,
+                align_right: self.align_right,
             }))
         });
 
@@ -203,6 +223,7 @@ struct PopupOverlay<'a, 'b, Message, Theme, Renderer> {
     state: &'b mut Tree,
     on_dismiss: Message,
     gap: f32,
+    align_right: bool,
 }
 
 impl<Message, Theme, Renderer> overlay::Overlay<Message, Theme, Renderer>
@@ -217,7 +238,13 @@ where
             renderer,
             &layout::Limits::new(Size::ZERO, bounds),
         );
-        let position = popup_position(self.anchor, popup.size(), bounds, self.gap);
+        let position = popup_position(
+            self.anchor,
+            popup.size(),
+            bounds,
+            self.gap,
+            self.align_right,
+        );
         layout::Node::with_children(popup.size(), vec![popup])
             .translate(Vector::new(position.x, position.y))
     }
@@ -345,6 +372,7 @@ mod tests {
                 Size::new(220.0, 180.0),
                 Size::new(800.0, 600.0),
                 8.0,
+                true,
             ),
             Point::new(280.0, 58.0)
         );
@@ -358,8 +386,23 @@ mod tests {
                 Size::new(220.0, 180.0),
                 Size::new(800.0, 600.0),
                 8.0,
+                true,
             ),
             Point::new(0.0, 382.0)
         );
     }
+
+    #[test]
+    fn popup_can_be_left_aligned_to_its_trigger() {
+        assert_eq!(
+            popup_position(
+                Rectangle::new(Point::new(120.0, 20.0), Size::new(80.0, 30.0)),
+                Size::new(220.0, 180.0),
+                Size::new(800.0, 600.0),
+                8.0,
+                false,
+            ),
+            Point::new(120.0, 58.0)
+        );
+    }
 }