callback renamed -> onEvent

examples/03_theming_system.lua

@@ -119,7 +119,7 @@ function Lv.load()
     textSize = "2vh",
     textColor = Color.new(1, 1, 1, 1),
     textAlign = enums.TextAlign.CENTER,
-    callback = function(element, event)
+    onEvent = function(element, event)
       if event.type == "click" then
         print("Normal button clicked!")
       end
@@ -139,7 +139,7 @@ function Lv.load()
     textColor = Color.new(0.3, 1, 0.3, 1),
     textAlign = enums.TextAlign.CENTER,
     active = true,
-    callback = function(element, event)
+    onEvent = function(element, event)
       if event.type == "click" then
         element.active = not element.active
         print("Active button toggled:", element.active)
@@ -160,7 +160,7 @@ function Lv.load()
     textColor = Color.new(0.5, 0.5, 0.5, 1),
     textAlign = enums.TextAlign.CENTER,
     disabled = true,
-    callback = function(element, event)
+    onEvent = function(element, event)
       -- This won't be called because button is disabled
       print("This shouldn't print!")
     end,
@@ -179,7 +179,7 @@ function Lv.load()
     textSize = "2vh",
     textColor = Color.new(1, 1, 1, 1),
     textAlign = enums.TextAlign.CENTER,
-    callback = function(element, event)
+    onEvent = function(element, event)
       if event.type == "click" then
         clickCount = clickCount + 1
         element.text = "Click Me! (" .. clickCount .. ")"

examples/05_animations.lua

@@ -63,7 +63,7 @@ function Lv.load()
     textColor = Color.new(1, 1, 1, 1),
     textAlign = enums.TextAlign.CENTER,
     cornerRadius = 10,
-    callback = function(element, event)
+    onEvent = function(element, event)
       if event.type == "click" then
         -- Fade out then fade in
         local fadeOut = Animation.fade(1.0, 1.0, 0.0)
@@ -109,7 +109,7 @@ function Lv.load()
     textColor = Color.new(1, 1, 1, 1),
     textAlign = enums.TextAlign.CENTER,
     cornerRadius = 10,
-    callback = function(element, event)
+    onEvent = function(element, event)
       if event.type == "click" then
         -- Scale up
         local scaleUp = Animation.scale(
@@ -193,7 +193,7 @@ function Lv.load()
       textColor = Color.new(1, 1, 1, 1),
       textAlign = enums.TextAlign.CENTER,
       cornerRadius = 8,
-      callback = function(element, event)
+      onEvent = function(element, event)
         if event.type == "click" then
           -- Fade out and in with this easing
           local fadeOut = Animation.fade(0.8, 1.0, 0.2)

examples/06_event_system.lua

@@ -71,7 +71,7 @@ function Lv.load()
     textColor = Color.new(1, 1, 1, 1),
     textAlign = enums.TextAlign.CENTER,
     cornerRadius = 10,
-    callback = function(element, event)
+    onEvent = function(element, event)
       local buttonName = event.button == 1 and "Left" or (event.button == 2 and "Right" or "Middle")
       local eventTypeName = event.type:sub(1,1):upper() .. event.type:sub(2)
       
@@ -113,7 +113,7 @@ function Lv.load()
     textColor = Color.new(1, 1, 1, 1),
     textAlign = enums.TextAlign.CENTER,
     cornerRadius = 10,
-    callback = function(element, event)
+    onEvent = function(element, event)
       if event.type == "click" then
         local mods = {}
         if event.modifiers.shift then table.insert(mods, "Shift") end
@@ -152,7 +152,7 @@ function Lv.load()
     textColor = Color.new(1, 1, 1, 1),
     textAlign = enums.TextAlign.CENTER,
     cornerRadius = 10,
-    callback = function(element, event)
+    onEvent = function(element, event)
       if event.type == "click" then
         if event.clickCount == 1 then
           addLogEntry("Single click detected")
@@ -237,7 +237,7 @@ function Lv.load()
     textColor = Color.new(1, 1, 1, 1),
     textAlign = enums.TextAlign.CENTER,
     cornerRadius = 5,
-    callback = function(element, event)
+    onEvent = function(element, event)
       if event.type == "press" then
         addLogEntry("Button 1: PRESSED")
         element.backgroundColor = Color.new(0.2, 0.3, 0.6, 1)
@@ -259,7 +259,7 @@ function Lv.load()
     textColor = Color.new(1, 1, 1, 1),
     textAlign = enums.TextAlign.CENTER,
     cornerRadius = 5,
-    callback = function(element, event)
+    onEvent = function(element, event)
       if event.type == "click" then
         clickCounter = clickCounter + 1
         element.text = "Click Counter: " .. clickCounter
@@ -278,7 +278,7 @@ function Lv.load()
     textColor = Color.new(1, 1, 1, 1),
     textAlign = enums.TextAlign.CENTER,
     cornerRadius = 5,
-    callback = function(element, event)
+    onEvent = function(element, event)
       if event.type == "click" then
         eventLog = {}
         addLogEntry("Log cleared!")

examples/11_input_controls.lua

@@ -72,7 +72,7 @@ function Lv.load()
     textColor = Color.new(1, 1, 1, 1),
     textAlign = enums.TextAlign.CENTER,
     cornerRadius = 8,
-    callback = function()
+    onEvent = function()
       counter = counter + 1
       counterDisplay.text = "Counter: " .. counter
     end
@@ -90,7 +90,7 @@ function Lv.load()
     textColor = Color.new(1, 1, 1, 1),
     textAlign = enums.TextAlign.CENTER,
     cornerRadius = 8,
-    callback = function()
+    onEvent = function()
       counter = counter - 1
       counterDisplay.text = "Counter: " .. counter
     end
@@ -108,7 +108,7 @@ function Lv.load()
     textColor = Color.new(1, 1, 1, 1),
     textAlign = enums.TextAlign.CENTER,
     cornerRadius = 8,
-    callback = function()
+    onEvent = function()
       counter = 0
       counterDisplay.text = "Counter: " .. counter
     end

examples/12_z_index_layering.lua

@@ -166,7 +166,7 @@ function Lv.load()
     })
     
     -- Add click handler to bring to front
-    box.callback = function(element)
+    box.onEvent = function(element)
       maxZ = maxZ + 1
       element.z = maxZ
       element.text = "Box " .. i .. "\nZ: " .. element.z

examples/13_comprehensive_demo.lua

@@ -249,7 +249,7 @@ function Lv.load()
     })
     
     -- Add hover animation
-    card.callback = function(element)
+    card.onEvent = function(element)
       local anim = Animation.new({
         duration = 0.2,
         start = { opacity = 1 },

examples/14_drag_slider.lua

@@ -99,7 +99,7 @@ local function createSlider(x, y, width, label, min, max, initialValue, onValueC
   })
 
   -- Make the background track interactive
-  sliderBg.callback = function(element, event)
+  sliderBg.onEvent = function(element, event)
     if event.type == "press" or event.type == "drag" then
       -- Get element bounds
       local bg_x = element.x