Highlight categories of businesses in the osm viewer

game/src/devtools/osm_viewer.rs

@@ -214,6 +214,14 @@ impl State<App> for Viewer {
             if self.fixed_object_outline.is_none() && old_id != app.primary.current_selection {
                 self.recalculate_top_panel(ctx, app);
             }
+
+            let maybe_amenity = ctx
+                .canvas
+                .get_cursor_in_screen_space()
+                .and_then(|_| self.top_panel.currently_hovering().cloned());
+            if let Some(ref mut b) = self.businesses {
+                b.hovering_on_amenity(ctx, app, maybe_amenity);
+            }
         }
 
         if ctx.canvas.get_cursor_in_map_space().is_some() && ctx.normal_left_click() {
@@ -323,6 +331,9 @@ impl State<App> for Viewer {
         }
         if let Some(ref b) = self.businesses {
             g.redraw(&b.highlight);
+            if let Some((_, ref d)) = b.hovering_on_amenity {
+                g.redraw(d);
+            }
         }
     }
 }
@@ -331,6 +342,7 @@ struct BusinessSearch {
     counts: Counter<String>,
     show: BTreeSet<String>,
     highlight: Drawable,
+    hovering_on_amenity: Option<(String, Drawable)>,
 }
 
 impl BusinessSearch {
@@ -346,6 +358,7 @@ impl BusinessSearch {
             counts,
             show,
             highlight: ctx.upload(GeomBatch::new()),
+            hovering_on_amenity: None,
         };
 
         // Initialize highlight
@@ -377,6 +390,33 @@ impl BusinessSearch {
         self.highlight = ctx.upload(batch);
     }
 
+    fn hovering_on_amenity(&mut self, ctx: &mut EventCtx, app: &App, amenity: Option<String>) {
+        if amenity.is_none() {
+            self.hovering_on_amenity = None;
+            return;
+        }
+
+        let amenity = amenity.unwrap();
+        if self
+            .hovering_on_amenity
+            .as_ref()
+            .map(|(current, _)| current == &amenity)
+            .unwrap_or(false)
+        {
+            return;
+        }
+
+        let mut batch = GeomBatch::new();
+        if self.counts.get(amenity.clone()) > 0 {
+            for b in app.primary.map.all_buildings() {
+                if b.amenities.iter().any(|(_, a)| a == &amenity) {
+                    batch.push(Color::BLUE, b.polygon.clone());
+                }
+            }
+        }
+        self.hovering_on_amenity = Some((amenity, ctx.upload(batch)));
+    }
+
     fn render(&self, ctx: &mut EventCtx) -> Widget {
         let mut col = Vec::new();
         col.push(Btn::text_bg2("Hide business search").build_def(ctx, Key::Tab));

widgetry/src/widgets/checkbox.rs

@@ -5,7 +5,7 @@ use crate::{
 
 pub struct Checkbox {
     pub(crate) enabled: bool,
-    btn: Button,
+    pub(crate) btn: Button,
     other_btn: Button,
 }
 

widgetry/src/widgets/mod.rs

@@ -12,8 +12,9 @@ use geom::{Distance, Percent, Polygon};
 use crate::widgets::containers::{Container, Nothing};
 pub use crate::widgets::panel::Panel;
 use crate::{
-    Button, Choice, Color, DeferDraw, DrawWithTooltips, Drawable, Dropdown, EventCtx, GeomBatch,
+    Button, Checkbox, Choice, Color, DeferDraw, DrawWithTooltips, Drawable, Dropdown, EventCtx,
-    GfxCtx, JustDraw, Menu, RewriteColor, ScreenDims, ScreenPt, ScreenRectangle, Text, TextBox,
+    GeomBatch, GfxCtx, JustDraw, Menu, RewriteColor, ScreenDims, ScreenPt, ScreenRectangle, Text,
+    TextBox,
 };
 
 pub mod autocomplete;
@@ -617,6 +618,10 @@ impl Widget {
             if btn.hovering {
                 return Some(&btn.action);
             }
+        } else if let Some(checkbox) = self.widget.downcast_ref::<Checkbox>() {
+            if checkbox.btn.hovering {
+                return Some(&checkbox.btn.action);
+            }
         } else if let Some(container) = self.widget.downcast_ref::<Container>() {
             for w in &container.members {
                 if let Some(a) = w.currently_hovering() {