SENSORS

src/layout/painter.rs

@@ -1,20 +1,22 @@
 use crate::{
-    UiRegion, WidgetId, Widgets,
+    SenseFn, SenseTrigger, Sensors, UiRegion, WidgetId, Widgets,
     primitive::{PrimitiveData, PrimitiveInstance, Primitives},
 };
 
 pub struct Painter<'a, Ctx> {
     nodes: &'a Widgets<Ctx>,
     ctx: &'a mut Ctx,
+    sensors: &'a mut Sensors<Ctx>,
     primitives: Primitives,
     pub region: UiRegion,
 }
 
 impl<'a, Ctx> Painter<'a, Ctx> {
-    pub fn new(nodes: &'a Widgets<Ctx>, ctx: &'a mut Ctx) -> Self {
+    pub fn new(nodes: &'a Widgets<Ctx>, ctx: &'a mut Ctx, sensors: &'a mut Sensors<Ctx>) -> Self {
         Self {
             nodes,
             ctx,
+            sensors,
             primitives: Primitives::default(),
             region: UiRegion::full(),
         }
@@ -31,17 +33,27 @@ impl<'a, Ctx> Painter<'a, Ctx> {
             .extend_from_slice(bytemuck::cast_slice::<_, u32>(&[data]));
     }
 
-    pub fn draw(&mut self, id: &WidgetId) where Ctx: 'static {
+    pub fn draw(&mut self, id: &WidgetId)
+    where
+        Ctx: 'static,
+    {
         self.nodes.get_dyn(id).draw(self);
     }
 
-    pub fn draw_within(&mut self, node: &WidgetId, region: UiRegion) where Ctx: 'static {
+    pub fn draw_within(&mut self, node: &WidgetId, region: UiRegion)
+    where
+        Ctx: 'static,
+    {
         let old = self.region;
         self.region.select(&region);
         self.draw(node);
         self.region = old;
     }
 
+    pub fn sense(&mut self, trigger: SenseTrigger, f: Box<dyn SenseFn<Ctx>>) {
+        self.sensors.push((trigger, f));
+    }
+
     pub fn finish(self) -> Primitives {
         self.primitives
     }