i have just invented the button (also fixed controls:consume)

lib/controls.lua

@@ -49,9 +49,11 @@ function controls:cache()
 end
 
 --- marks a control consumed for the current frame
+---
 --- the control will no longer be considered active
 --- @param key string
 function controls:consume(key)
+    cachedKeys[key] = true
     currentKeys[key] = nil
 end
 

lib/ui/core.lua

@@ -1,3 +1,5 @@
+local controls = require "lib.controls"
+
 ---@class UIConstraints
 ---@field min_w number
 ---@field min_h number
@@ -107,6 +109,20 @@ function Element:draw()
     end
 end
 
+--- calls the callback if clicked inside own bounding box (rectangular)
+--- @param callback function
+function Element:onTap(callback)
+    local mx, my = love.mouse.getPosition()
+    if mx > self.origin.x and mx < self.origin.x + self.size.x
+        and my > self.origin.y and my < self.origin.y + self.size.y
+    then
+        if controls:isJustPressed("select") then
+            controls:consume("select")
+            callback()
+        end
+    end
+end
+
 -- =============== SingleChild / MultiChild базовые ===============
 
 --- @class SingleChildElement: Element

lib/ui/layout.lua

@@ -1,29 +1,20 @@
 local Vec3 = require "lib.utils.vec3"
 local ui = require "lib.ui.core"
-local controls = require "lib.controls"
+
 
 --- @type Rectangle
 local ReactiveRectangle = ui.Rectangle {
     size = Vec3 { 100, 100 },
     color = { 1, 0, 0 },
-    state = { tick = 0 }
+    state = { active = false }
 }
 function ReactiveRectangle:update(dt)
     getmetatable(self):update(dt)
 
-    local mx, my = love.mouse.getPosition()
+    self:onTap(function()
-    if mx > self.origin.x and mx < self.origin.x + self.size.x
+        self.state.active = not self.state.active
-        and my > self.origin.y and my < self.origin.y + self.size.y
+        self.color = self.state.active and { 0, 1, 0 } or { 1, 0, 0 }
-    then
+    end)
-        if controls:isJustPressed("select") then
-            controls:consume("select")
-        end
-        self.color = { 0, 1, 0 }
-    else
-        self.color = { 1, 0, 0 }
-    end
-
-    self.state.tick = self.state.tick + 1
 end
 
 local Layout = ui.Root {