diff --git a/TODO b/TODO
index d945cde..9e3d6a4 100644
--- a/TODO
+++ b/TODO
@@ -1,5 +1,4 @@
 images
 text
-ui ctx = ui + app ctx for sensors
 abstract sensors to work with any event, maybe associate data as well?
 make current senses orable so you can select multiple
diff --git a/src/core/sense.rs b/src/core/sense.rs
index 4338c9e..7ca8817 100644
--- a/src/core/sense.rs
+++ b/src/core/sense.rs
@@ -1,11 +1,11 @@
-use crate::{Sense, SenseFn, Sensor, Ui, Widget, WidgetId, WidgetIdFnRet, WidgetLike};
+use crate::{Sense, SenseCtx, SenseFn, Sensor, Widget, WidgetId, WidgetIdFnRet, WidgetLike};
 
 pub trait Sensable<W, Ctx, Tag> {
     fn on(self, sense: Sense, f: impl SenseFn<Ctx>) -> WidgetIdFnRet!(W, Ctx);
     fn id_on(
         self,
         sense: Sense,
-        f: impl FnMut(&WidgetId<W>, &mut Ui<Ctx>, &mut Ctx) + 'static + Clone,
+        f: impl FnMut(&WidgetId<W>, SenseCtx<Ctx>) + 'static + Clone,
     ) -> WidgetIdFnRet!(W, Ctx)
     where
         W: Widget<Ctx>;
@@ -35,26 +35,24 @@ impl<W: WidgetLike<Ctx, Tag>, Ctx, Tag> Sensable<W::Widget, Ctx, Tag> for W {
     fn id_on(
         self,
         sense: Sense,
-        // trait copied here bc rust analyzer skill issue
-        mut f: impl FnMut(&WidgetId<W::Widget>, &mut Ui<Ctx>, &mut Ctx) + 'static + Clone,
+        mut f: impl FnMut(&WidgetId<W::Widget>, SenseCtx<Ctx>) + 'static + Clone,
     ) -> WidgetIdFnRet!(W::Widget, Ctx)
     where
         W::Widget: Widget<Ctx>,
     {
         self.with_id(move |ui, id| {
             let id2 = id.clone();
-            ui.add(id.on(sense, move |ui, ctx| f(&id2, ui, ctx)))
+            ui.add(id.on(sense, move |ctx| f(&id2, ctx)))
         })
     }
     fn edit_on(
         self,
         sense: Sense,
-        // trait copied here bc rust analyzer skill issue
         mut f: impl FnMut(&mut W::Widget, &mut Ctx) + 'static + Clone,
     ) -> WidgetIdFnRet!(W::Widget, Ctx)
     where
         W::Widget: Widget<Ctx>,
     {
-        self.id_on(sense, move |id, ui, ctx| f(&mut ui[id], ctx))
+        self.id_on(sense, move |id, ctx| f(&mut ctx.ui[id], ctx.app))
     }
 }
diff --git a/src/layout/sense.rs b/src/layout/sense.rs
index d8af829..9df7752 100644
--- a/src/layout/sense.rs
+++ b/src/layout/sense.rs
@@ -44,10 +44,14 @@ pub struct SensorGroup<Ctx> {
     pub cursor: ActivationState,
     pub sensors: Vec<Sensor<Ctx>>,
 }
-pub trait SenseFn<Ctx>: FnMut(&mut Ui<Ctx>, &mut Ctx) + 'static {
+pub struct SenseCtx<'a, Ctx> {
+    pub ui: &'a mut Ui<Ctx>,
+    pub app: &'a mut Ctx,
+}
+pub trait SenseFn<Ctx>: FnMut(SenseCtx<Ctx>) + 'static {
     fn box_clone(&self) -> Box<dyn SenseFn<Ctx>>;
 }
-impl<F: FnMut(&mut Ui<Ctx>, &mut Ctx) + 'static + Clone, Ctx> SenseFn<Ctx> for F {
+impl<F: FnMut(SenseCtx<Ctx>) + 'static + Clone, Ctx> SenseFn<Ctx> for F {
     fn box_clone(&self) -> Box<dyn SenseFn<Ctx>> {
         Box::new(self.clone())
     }
@@ -77,7 +81,10 @@ impl<Ctx> Ui<Ctx> {
 
             for sensor in &mut group.sensors {
                 if should_run(sensor.sense, group.cursor, group.hover) {
-                    (sensor.f.box_clone())(self, ctx);
+                    (sensor.f.box_clone())(SenseCtx {
+                        ui: self,
+                        app: ctx,
+                    });
                 }
             }
         }
diff --git a/src/testing/mod.rs b/src/testing/mod.rs
index a451058..cf288c9 100644
--- a/src/testing/mod.rs
+++ b/src/testing/mod.rs
@@ -84,10 +84,9 @@ impl Client {
             let main = main.clone();
             let to = to.clone().erase_type();
             Rect::new(color)
-                .on(Sense::PressEnd, |_, _| {})
-                .id_on(Sense::PressStart, move |id, ui, _| {
-                    ui[&main].inner = to.clone();
-                    ui[id].color = color.add_rgb(-0.2);
+                .id_on(Sense::PressStart, move |id, ctx| {
+                    ctx.ui[&main].inner = to.clone();
+                    ctx.ui[id].color = color.add_rgb(-0.2);
                 })
                 .edit_on(Sense::HoverStart, move |r, _| {
                     r.color = color.add_rgb(0.1);
@@ -110,8 +109,8 @@ impl Client {
         );
         let test_button = Rect::new(Color::PURPLE)
             .radius(30)
-            .on(Sense::PressStart, move |ui, _| {
-                println!("{}", ui.num_widgets());
+            .on(Sense::PressStart, move |ctx| {
+                println!("{}", ctx.ui.num_widgets());
             })
             .region(
                 UiRegion::corner(Corner::BotRight)
@@ -122,8 +121,8 @@ impl Client {
         let s = span_add.clone();
         let del_button = Rect::new(Color::RED)
             .radius(30)
-            .on(Sense::PressStart, move |ui, _| {
-                ui[&s].children.pop();
+            .on(Sense::PressStart, move |ctx| {
+                ctx.ui[&s].children.pop();
             })
             .region(
                 UiRegion::corner(Corner::BotLeft)