diff --git a/:w b/:w
new file mode 100644
index 0000000..50d518c
--- /dev/null
+++ b/:w
@@ -0,0 +1,107 @@
+use crate::{HashMap, Ui, UiRegion, Vec2, WidgetId, util::Id};
+
+pub trait SenseCtx: 'static {
+    fn cursor_state(&self) -> CursorState;
+    fn window_size(&self) -> Vec2;
+    fn active(&mut self, trigger: &SenseTrigger) -> bool;
+}
+
+#[derive(Clone, Copy, PartialEq)]
+pub enum Sense {
+    PressStart,
+    Pressing,
+    PressEnd,
+    HoverStart,
+    Hovering,
+    HoverEnd,
+    NotHovering,
+}
+
+pub struct CursorState {
+    pos: Vec2,
+    exists: bool,
+    primary: ActivationState,
+}
+
+#[derive(Debug, Clone, Copy, Default)]
+pub enum ActivationState {
+    Start,
+    On,
+    End,
+    #[default]
+    Off,
+}
+
+pub struct Sensor<Ctx> {
+    pub sense: Sense,
+    pub f: Box<dyn SenseFn<Ctx>>,
+}
+
+impl<Ctx: 'static> Clone for SensorGroup<Ctx> {
+    fn clone(&self) -> Self {
+        Self {
+            shape: self.shape.clone(),
+            hover: self.hover.clone(),
+            f: self.f.box_clone(),
+        }
+    }
+}
+pub type SensorMap<Ctx> = HashMap<Id, Vec<Sensor<Ctx>>>;
+pub type ActiveSensors<Ctx> = Vec<SensorGroup<Ctx>>;
+pub trait SenseFn_<Ctx> = FnMut(&mut Ui<Ctx>, &mut Ctx) + 'static;
+pub type SenseShape = UiRegion;
+#[derive(Clone)]
+pub struct SenseTrigger {
+    pub shape: SenseShape,
+    pub sense: Sense,
+}
+pub struct SensorGroup<Ctx> {
+    pub shape: SenseShape,
+    pub hover: ActivationState,
+    pub sensors: Vec<Sensor<Ctx>>,
+}
+pub trait SenseFn<Ctx>: SenseFn_<Ctx> {
+    fn box_clone(&self) -> Box<dyn SenseFn<Ctx>>;
+}
+impl<F: SenseFn_<Ctx> + Clone, Ctx> SenseFn<Ctx> for F {
+    fn box_clone(&self) -> Box<dyn SenseFn<Ctx>> {
+        Box::new(self.clone())
+    }
+}
+
+impl<Ctx> Ui<Ctx> {
+    pub fn add_sensor<W>(&mut self, id: &WidgetId<W>, f: Sensor<Ctx>) {
+        self.sensor_map
+            .entry(id.id.duplicate())
+            .or_default()
+            .push(f);
+    }
+
+    pub fn run_sensors(&mut self, ctx: &mut Ctx, cursor: &CursorState, window_size: Vec2)
+    where
+        Ctx: SenseCtx + 'static,
+    {
+        let mut groups = std::mem::take(&mut self.active_sensors_swap);
+        groups.clone_from(&self.active_sensors);
+        for (hover, sensors) in groups.drain(..).rev() {
+            for mut sensor in sensors {
+                if should_run(sensor.trigger, cursor, hover, window_size) {
+                    (sensor.f)(self, ctx);
+                }
+            }
+        }
+        self.active_sensors_swap = groups;
+    }
+}
+
+pub fn should_run(
+    trigger: SenseTrigger,
+    cursor: &CursorState,
+    hover: ActivationState,
+    window_size: Vec2,
+) -> bool {
+    let region = trigger.shape.to_screen(window_size);
+    if !cursor.exists || !region.contains(cursor.pos) {
+        return trigger.sense == Sense::NotHovering;
+    }
+}
diff --git a/src/core/sense.rs b/src/core/sense.rs
index 2d695d5..ff1c28f 100644
--- a/src/core/sense.rs
+++ b/src/core/sense.rs
@@ -1,28 +1,32 @@
-use crate::{Sense, SenseFn, SenseTrigger, Sensor, Ui, Widget, WidgetIdFn, WidgetLike};
-
-pub trait SenseCtx: 'static {
-    fn active(&mut self, trigger: &SenseTrigger) -> bool;
-}
+use crate::{Sense, SenseFn, Sensor, Ui, Widget, WidgetId, WidgetIdFn, WidgetLike};
 
 pub trait Sensable<W, Ctx, Tag> {
-    fn sense(
+    fn on(
         self,
         sense: Sense,
         // trait copied here bc rust analyzer skill issue
-        f: impl Fn(&mut Ui<Ctx>, &mut Ctx) + 'static + Clone,
+        f: impl FnMut(&mut Ui<Ctx>, &mut Ctx) + 'static + Clone,
     ) -> impl WidgetIdFn<W, Ctx>;
-    fn sense_and_edit(
+    fn id_on(
         self,
         sense: Sense,
         // trait copied here bc rust analyzer skill issue
-        f: impl Fn(&mut W, &mut Ctx) + 'static + Clone,
+        f: impl FnMut(&WidgetId<W>, &mut Ui<Ctx>, &mut Ctx) + 'static + Clone,
+    ) -> impl WidgetIdFn<W, Ctx>
+    where
+        W: Widget<Ctx>;
+    fn edit_on(
+        self,
+        sense: Sense,
+        // trait copied here bc rust analyzer skill issue
+        f: impl FnMut(&mut W, &mut Ctx) + 'static + Clone,
     ) -> impl WidgetIdFn<W, Ctx>
     where
         W: Widget<Ctx>;
 }
 
 impl<W: WidgetLike<Ctx, Tag>, Ctx, Tag> Sensable<W::Widget, Ctx, Tag> for W {
-    fn sense(self, sense: Sense, f: impl SenseFn<Ctx> + Clone) -> impl WidgetIdFn<W::Widget, Ctx> {
+    fn on(self, sense: Sense, f: impl SenseFn<Ctx> + Clone) -> impl WidgetIdFn<W::Widget, Ctx> {
         move |ui| {
             let id = self.add(ui);
             ui.add_sensor(
@@ -35,18 +39,29 @@ impl<W: WidgetLike<Ctx, Tag>, Ctx, Tag> Sensable<W::Widget, Ctx, Tag> for W {
             id
         }
     }
-    fn sense_and_edit(
+    fn id_on(
         self,
         sense: Sense,
         // trait copied here bc rust analyzer skill issue
-        f: impl Fn(&mut W::Widget, &mut Ctx) + 'static + Clone,
+        mut f: impl FnMut(&WidgetId<W::Widget>, &mut Ui<Ctx>, &mut Ctx) + 'static + Clone,
     ) -> impl WidgetIdFn<W::Widget, Ctx>
     where
         W::Widget: Widget<Ctx>,
     {
         self.with_id(move |ui, id| {
             let id2 = id.clone();
-            ui.add(id.sense(sense, move |ui, ctx| f(&mut ui[&id2], ctx)))
+            ui.add(id.on(sense, move |ui, ctx| f(&id2, ui, 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,
+    ) -> impl WidgetIdFn<W::Widget, Ctx>
+    where
+        W::Widget: Widget<Ctx>,
+    {
+        self.id_on(sense, move |id, ui, ctx| f(&mut ui[id], ctx))
+    }
 }
diff --git a/src/layout/painter.rs b/src/layout/painter.rs
index d8900fe..a60078b 100644
--- a/src/layout/painter.rs
+++ b/src/layout/painter.rs
@@ -1,5 +1,5 @@
 use crate::{
-    ActiveSensor, ActiveSensors, SenseTrigger, SensorMap, UiRegion, WidgetId, Widgets,
+    ActiveSensors, SensorMap, UiRegion, WidgetId, Widgets,
     primitive::{PrimitiveData, PrimitiveInstance, Primitives},
 };
 
@@ -7,7 +7,7 @@ pub struct Painter<'a, Ctx: 'static> {
     nodes: &'a Widgets<Ctx>,
     ctx: &'a mut Ctx,
     sensors_map: &'a mut SensorMap<Ctx>,
-    active_sensors: &'a mut ActiveSensors<Ctx>,
+    active_sensors: &'a mut ActiveSensors,
     primitives: Primitives,
     pub region: UiRegion,
 }
@@ -17,7 +17,7 @@ impl<'a, Ctx> Painter<'a, Ctx> {
         nodes: &'a Widgets<Ctx>,
         ctx: &'a mut Ctx,
         sensors_map: &'a mut SensorMap<Ctx>,
-        active_sensors: &'a mut ActiveSensors<Ctx>,
+        active_sensors: &'a mut ActiveSensors,
     ) -> Self {
         Self {
             nodes,
@@ -44,19 +44,8 @@ impl<'a, Ctx> Painter<'a, Ctx> {
     where
         Ctx: 'static,
     {
-        if let Some(sensors) = self.sensors_map.get(&id.id) {
-            self.active_sensors.push(
-                sensors
-                    .iter()
-                    .map(|sensor| ActiveSensor {
-                        trigger: SenseTrigger {
-                            shape: self.region,
-                            sense: sensor.sense,
-                        },
-                        f: sensor.f.box_clone(),
-                    })
-                    .collect(),
-            );
+        if self.sensors_map.get(&id.id).is_some() {
+            self.active_sensors.push((self.region, id.id.duplicate()));
         }
         self.nodes.get_dyn(id).draw(self);
     }
diff --git a/src/layout/region.rs b/src/layout/region.rs
index 7d9ec56..dd6672c 100644
--- a/src/layout/region.rs
+++ b/src/layout/region.rs
@@ -174,9 +174,7 @@ impl UiRegion {
     }
 
     pub fn shifted(mut self, offset: impl Into<Vec2>) -> Self {
-        println!("before {:?}", self);
         self.shift(offset);
-        println!("after {:?}", self);
         self
     }
 
diff --git a/src/layout/sense.rs b/src/layout/sense.rs
index 2ac26ab..de0eee8 100644
--- a/src/layout/sense.rs
+++ b/src/layout/sense.rs
@@ -1,11 +1,29 @@
-use crate::{HashMap, Ui, UiRegion, util::Id};
+use crate::{HashMap, Ui, UiRegion, Vec2, WidgetId, util::Id};
 
 #[derive(Clone, Copy, PartialEq)]
 pub enum Sense {
-    Press,
-    Held,
-    Hover,
-    NoHover,
+    PressStart,
+    Pressing,
+    PressEnd,
+    HoverStart,
+    Hovering,
+    HoverEnd,
+    NotHovering,
+}
+
+pub struct CursorState {
+    pub pos: Vec2,
+    pub exists: bool,
+    pub pressed: bool,
+}
+
+#[derive(Debug, Clone, Copy, Default, PartialEq)]
+pub enum ActivationState {
+    Start,
+    On,
+    End,
+    #[default]
+    Off,
 }
 
 pub struct Sensor<Ctx> {
@@ -13,20 +31,8 @@ pub struct Sensor<Ctx> {
     pub f: Box<dyn SenseFn<Ctx>>,
 }
 
-pub struct ActiveSensor<Ctx> {
-    pub trigger: SenseTrigger,
-    pub f: Box<dyn SenseFn<Ctx>>,
-}
-impl<Ctx: 'static> Clone for ActiveSensor<Ctx> {
-    fn clone(&self) -> Self {
-        Self {
-            trigger: self.trigger.clone(),
-            f: self.f.box_clone(),
-        }
-    }
-}
-pub type SensorMap<Ctx> = HashMap<Id, Vec<Sensor<Ctx>>>;
-pub type ActiveSensors<Ctx> = Vec<Vec<ActiveSensor<Ctx>>>;
+pub type SensorMap<Ctx> = HashMap<Id, SensorGroup<Ctx>>;
+pub type ActiveSensors = Vec<(SenseShape, Id)>;
 pub trait SenseFn_<Ctx> = FnMut(&mut Ui<Ctx>, &mut Ctx) + 'static;
 pub type SenseShape = UiRegion;
 #[derive(Clone)]
@@ -34,6 +40,11 @@ pub struct SenseTrigger {
     pub shape: SenseShape,
     pub sense: Sense,
 }
+pub struct SensorGroup<Ctx> {
+    pub hover: ActivationState,
+    pub cursor: ActivationState,
+    pub sensors: Vec<Sensor<Ctx>>,
+}
 pub trait SenseFn<Ctx>: SenseFn_<Ctx> {
     fn box_clone(&self) -> Box<dyn SenseFn<Ctx>>;
 }
@@ -42,3 +53,110 @@ impl<F: SenseFn_<Ctx> + Clone, Ctx> SenseFn<Ctx> for F {
         Box::new(self.clone())
     }
 }
+
+impl<Ctx> Ui<Ctx> {
+    pub fn add_sensor<W>(&mut self, id: &WidgetId<W>, f: Sensor<Ctx>) {
+        self.sensor_map
+            .entry(id.id.duplicate())
+            .or_default()
+            .sensors
+            .push(f);
+    }
+
+    pub fn run_sensors(&mut self, ctx: &mut Ctx, cursor: &CursorState, window_size: Vec2)
+    where
+        Ctx: 'static,
+    {
+        let mut active = std::mem::take(&mut self.active_sensors);
+        let mut map = std::mem::take(&mut self.sensor_map);
+        for (shape, id) in active.iter_mut().rev() {
+            let group = &mut map.get_mut(id).unwrap();
+            let region = shape.to_screen(window_size);
+            let in_shape = cursor.exists && region.contains(cursor.pos);
+            group.hover.update(in_shape);
+            group.cursor.update(cursor.pressed && in_shape);
+
+            for sensor in &mut group.sensors {
+                if should_run(sensor.sense, group.cursor, group.hover) {
+                    (sensor.f.box_clone())(self, ctx);
+                }
+            }
+        }
+        self.sensor_map = map;
+        self.active_sensors = active;
+    }
+}
+
+pub fn should_run(sense: Sense, cursor: ActivationState, hover: ActivationState) -> bool {
+    match sense {
+        Sense::PressStart => cursor.is_start(),
+        Sense::Pressing => cursor.is_on(),
+        Sense::PressEnd => cursor.is_end(),
+        Sense::HoverStart => hover.is_start(),
+        Sense::Hovering => hover.is_on(),
+        Sense::HoverEnd => hover.is_end(),
+        Sense::NotHovering => hover.is_off(),
+    }
+}
+
+impl ActivationState {
+    pub fn is_start(&self) -> bool {
+        *self == Self::Start
+    }
+    pub fn is_on(&self) -> bool {
+        *self == Self::Start || *self == Self::On
+    }
+    pub fn is_end(&self) -> bool {
+        *self == Self::End
+    }
+    pub fn is_off(&self) -> bool {
+        *self == Self::End || *self == Self::Off
+    }
+    pub fn update(&mut self, on: bool) {
+        *self = match *self {
+            Self::Start => match on {
+                true => Self::On,
+                false => Self::End,
+            },
+            Self::On => match on {
+                true => Self::On,
+                false => Self::End,
+            },
+            Self::End => match on {
+                true => Self::Start,
+                false => Self::Off,
+            },
+            Self::Off => match on {
+                true => Self::Start,
+                false => Self::Off,
+            },
+        }
+    }
+}
+
+impl<Ctx> Default for SensorGroup<Ctx> {
+    fn default() -> Self {
+        Self {
+            hover: Default::default(),
+            cursor: Default::default(),
+            sensors: Default::default(),
+        }
+    }
+}
+impl<Ctx: 'static> Clone for SensorGroup<Ctx> {
+    fn clone(&self) -> Self {
+        Self {
+            hover: self.hover,
+            cursor: self.cursor,
+            sensors: self.sensors.clone(),
+        }
+    }
+}
+impl<Ctx: 'static> Clone for Sensor<Ctx> {
+    fn clone(&self) -> Self {
+        Self {
+            sense: self.sense,
+            f: self.f.box_clone(),
+        }
+    }
+}
diff --git a/src/layout/ui.rs b/src/layout/ui.rs
index 0ff8b11..64f66cb 100644
--- a/src/layout/ui.rs
+++ b/src/layout/ui.rs
@@ -1,5 +1,5 @@
 use crate::{
-    ActiveSensors, HashMap, Painter, SenseCtx, Sensor, SensorMap, Widget, WidgetId, WidgetLike,
+    ActiveSensors, HashMap, Painter, SensorMap, Widget, WidgetId, WidgetLike,
     primitive::Primitives,
     util::{IDTracker, Id},
 };
@@ -13,8 +13,8 @@ pub struct Ui<Ctx> {
     base: Option<WidgetId>,
     widgets: Widgets<Ctx>,
     updates: Vec<WidgetId>,
-    active_sensors: ActiveSensors<Ctx>,
-    sensor_map: SensorMap<Ctx>,
+    pub(super) active_sensors: ActiveSensors,
+    pub(super) sensor_map: SensorMap<Ctx>,
     primitives: Primitives,
     full_redraw: bool,
 }
@@ -85,26 +85,6 @@ impl<Ctx> Ui<Ctx> {
         self.primitives = painter.finish();
     }
 
-    pub fn add_sensor<W>(&mut self, id: &WidgetId<W>, f: Sensor<Ctx>) {
-        self.sensor_map
-            .entry(id.id.duplicate())
-            .or_default()
-            .push(f);
-    }
-
-    pub fn run_sensors(&mut self, ctx: &mut Ctx)
-    where
-        Ctx: SenseCtx + 'static,
-    {
-        for sensors in self.active_sensors.clone().iter().rev() {
-            for sensor in sensors {
-                if ctx.active(&sensor.trigger) {
-                    (sensor.f.box_clone())(self, ctx);
-                }
-            }
-        }
-    }
-
     pub fn update(&mut self, ctx: &mut Ctx) -> Option<&Primitives>
     where
         Ctx: 'static,
diff --git a/src/testing/input.rs b/src/testing/input.rs
index 5d80c04..0971d1f 100644
--- a/src/testing/input.rs
+++ b/src/testing/input.rs
@@ -1,61 +1,44 @@
-use gui::{Sense, SenseCtx, SenseTrigger, Vec2};
+use gui::{CursorState, Vec2};
 use winit::event::WindowEvent;
 
 use crate::testing::Client;
 
 #[derive(Default)]
 pub struct Input {
-    size: Vec2,
     mouse_pos: Vec2,
     mouse_pressed: bool,
-    mouse_just_pressed: bool,
-    mouse_just_released: bool,
-    mouse_in: bool,
+    mouse_exists: bool,
 }
 
 impl Input {
     pub fn event(&mut self, event: &WindowEvent) {
-        self.mouse_just_pressed = false;
-        self.mouse_just_released = false;
         match event {
-            WindowEvent::Resized(size) => {
-                self.size = Vec2::new(size.width as f32, size.height as f32);
-            }
             WindowEvent::CursorMoved { position, .. } => {
                 self.mouse_pos = Vec2::new(position.x as f32, position.y as f32);
-                self.mouse_in = true;
+                self.mouse_exists = true;
             }
             WindowEvent::MouseInput { state, button, .. } => match button {
                 winit::event::MouseButton::Left => {
-                    if state.is_pressed() {
-                        self.mouse_just_pressed = !self.mouse_pressed;
-                        self.mouse_pressed = true;
-                    } else {
-                        self.mouse_just_released = self.mouse_pressed;
-                        self.mouse_pressed = false;
-                    }
+                    self.mouse_pressed = state.is_pressed();
                 }
                 _ => (),
             },
             _ => (),
         }
     }
-    fn active(&mut self, trigger: &SenseTrigger) -> bool {
-        let region = trigger.shape.to_screen(self.size);
-        if !self.mouse_in || !region.contains(self.mouse_pos) {
-            return trigger.sense == Sense::NoHover;
-        }
-        match trigger.sense {
-            Sense::Press => self.mouse_just_pressed,
-            Sense::Held => self.mouse_pressed,
-            Sense::Hover => true,
-            Sense::NoHover => false,
-        }
-    }
 }
 
-impl SenseCtx for Client {
-    fn active(&mut self, trigger: &SenseTrigger) -> bool {
-        self.input.active(trigger)
+impl Client {
+    pub fn window_size(&self) -> Vec2 {
+        let size = self.renderer.window().inner_size();
+        (size.width, size.height).into()
+    }
+
+    pub fn cursor_state(&self) -> CursorState {
+        CursorState {
+            pos: self.input.mouse_pos,
+            exists: self.input.mouse_exists,
+            pressed: self.input.mouse_pressed,
+        }
     }
 }
diff --git a/src/testing/mod.rs b/src/testing/mod.rs
index 8569a45..b331146 100644
--- a/src/testing/mod.rs
+++ b/src/testing/mod.rs
@@ -84,17 +84,18 @@ impl Client {
             let main = main.clone();
             let to = to.clone().erase_type();
             Rect::new(color)
-                .sense(Sense::Press, move |ui, _| {
+                .id_on(Sense::PressStart, move |id, ui, _| {
                     ui[&main].inner = to.clone();
+                    ui[id].color = color.add_rgb(-0.2);
                 })
-                .sense_and_edit(Sense::Hover, move |r, _| {
+                .edit_on(Sense::HoverStart, move |r, _| {
                     r.color = color.add_rgb(0.1);
                 })
-                .sense_and_edit(Sense::NoHover, move |r, _| {
-                    r.color = color;
+                .edit_on(Sense::PressEnd, move |r, _| {
+                    r.color = color.add_rgb(0.1);
                 })
-                .sense_and_edit(Sense::Held, move |r, _| {
-                    r.color = color.add_rgb(-0.1);
+                .edit_on(Sense::HoverEnd, move |r, _| {
+                    r.color = color;
                 })
         }
 
@@ -135,7 +136,9 @@ impl Client {
 
     pub fn event(&mut self, event: WindowEvent, event_loop: &ActiveEventLoop, ui: &mut Ui<Self>) {
         self.input.event(&event);
-        ui.run_sensors(self);
+        let cursor_state = self.cursor_state();
+        let window_size = self.window_size();
+        ui.run_sensors(self, &cursor_state, window_size);
         match event {
             WindowEvent::CloseRequested => event_loop.exit(),
             WindowEvent::RedrawRequested => {
diff --git a/src/util/id.rs b/src/util/id.rs
index cdb8b9f..e76bb65 100644
--- a/src/util/id.rs
+++ b/src/util/id.rs
@@ -13,10 +13,6 @@ pub struct IDTracker {
 }
 
 impl IDTracker {
-    pub fn new() -> Self {
-        Self::default()
-    }
-
     #[allow(clippy::should_implement_trait)]
     pub fn next(&mut self) -> Id {
         if let Some(id) = self.free.pop() {