add module system and move sensor into core with it

src/layout/painter.rs

@@ -1,6 +1,6 @@
 use crate::{
     layout::{
-        ActiveWidgets, Layers, TextAttrs, TextBuffer, TextData, TextOffset, TextureHandle,
+        ActiveWidgets, Layers, Modules, TextAttrs, TextBuffer, TextData, TextOffset, TextureHandle,
         Textures, UiRegion, UiVec2, Vec2, WidgetId, Widgets,
     },
     render::{Primitive, PrimitiveHandle},
@@ -25,6 +25,7 @@ pub struct PainterCtx<'a> {
     pub textures: &'a mut Textures,
     pub text: &'a mut TextData,
     pub screen_size: Vec2,
+    pub modules: &'a mut Modules,
     drawing: HashSet<Id>,
 }
 
@@ -44,6 +45,7 @@ impl<'a> PainterCtx<'a> {
         widgets: &'a Widgets,
         layers: &'a mut Layers,
         active: &'a mut ActiveWidgets,
+        modules: &'a mut Modules,
         textures: &'a mut Textures,
         text: &'a mut TextData,
         screen_size: Vec2,
@@ -55,6 +57,7 @@ impl<'a> PainterCtx<'a> {
             textures,
             text,
             screen_size,
+            modules,
             drawing: HashSet::default(),
         }
     }
@@ -165,10 +168,8 @@ impl<'a> PainterCtx<'a> {
             }
         }
 
-        if self.widgets.data(id).is_some_and(|w| w.sensor) {
-            self.layers[layer]
-                .sensors
-                .insert(id.duplicate(), instance.region);
+        for m in self.modules.iter_mut() {
+            m.on_draw(&instance);
         }
         self.active.insert(id.duplicate(), instance);
     }
@@ -182,7 +183,9 @@ impl<'a> PainterCtx<'a> {
             }
             inst.textures.clear();
             self.textures.free();
-            self.layers[inst.layer].sensors.remove(id);
+            for m in self.modules.iter_mut() {
+                m.on_undraw(inst);
+            }
         }
         inst
     }