--- a/tests/test_panel.nim	Sat Feb 10 15:55:05 2024 +0700
+++ b/tests/test_panel.nim	Sat Feb 10 21:19:31 2024 +0700
@@ -2,18 +2,44 @@
 
 import semicongine
 
+var counter = 0
+var counterText: Text
+
+proc click(panel: var Panel, buttons: set[MouseButton]) =
+  if buttons.contains(Mouse1):
+    counter.inc
+  if buttons.contains(Mouse3):
+    counter.dec
+  counterText.text = $counter
+proc enter(panel: var Panel) =
+  panel.size = newVec2f(0.22, 0.22)
+proc leave(panel: var Panel) =
+  panel.size = newVec2f(0.2, 0.2)
 
 proc main() =
   # setup engine
   var engine = initEngine("Test panels")
   engine.initRenderer([])
 
+  const B = [0'u8, 0'u8, 0'u8, 255'u8]
+  const T = [0'u8, 0'u8, 0'u8, 0'u8]
   # build scene
+  #
   var
     font = loadFont("DejaVuSans.ttf", lineHeightPixels = 210'f32)
     scene = Scene(name: "main")
-    origin = initPanel(size = newVec2f(0.01, 0.01), color = newVec4f(0, 0, 0, 1))
-    panel = initPanel(size = newVec2f(0.2, 0.2), color = newVec4f(1, 0, 0, 1))
+    origin = initPanel(
+      size = newVec2f(0.02, 0.02),
+      color = newVec4f(1, 1, 1, 1),
+      texture = Texture(isGrayscale: false, colorImage: newImage[RGBAPixel](3, 3, [T, B, T, B, B, B, T, B, T]), sampler: NEAREST_SAMPLER),
+    )
+    panel = initPanel(
+      size = newVec2f(0.2, 0.2),
+      color = newVec4f(1, 0, 0, 0.5),
+      onMouseDown = click,
+      onMouseEnter = enter,
+      onMouseLeave = leave
+    )
     help_text = font.initText("""Controls
 
 Horizontal alignment:
@@ -25,6 +51,9 @@
   F5: Center
   F6: Bottom""", scale = 0.0002, position = newVec2f(-0.9, -0.9), horizontalAlignment = Left, verticalAlignment = Top)
 
+  counterText = font.initText($counter, maxLen = 99, scale = 0.0004)
+
+  scene.add counterText
   scene.add panel
   scene.add help_text
   scene.add origin
@@ -34,17 +63,33 @@
     if engine.windowWasResized():
       var winSize = engine.getWindow().size
       panel.aspect_ratio = winSize[0] / winSize[1]
+      counterText.aspect_ratio = winSize[0] / winSize[1]
       origin.aspect_ratio = winSize[0] / winSize[1]
       help_text.aspect_ratio = winSize[0] / winSize[1]
 
-    if engine.keyWasPressed(F1): panel.horizontalAlignment = Left
-    elif engine.keyWasPressed(F2): panel.horizontalAlignment = Center
-    elif engine.keyWasPressed(F3): panel.horizontalAlignment = Right
-    elif engine.keyWasPressed(F4): panel.verticalAlignment = Top
-    elif engine.keyWasPressed(F5): panel.verticalAlignment = Center
-    elif engine.keyWasPressed(F6): panel.verticalAlignment = Bottom
+    if engine.keyWasPressed(F1):
+      panel.horizontalAlignment = Left
+      counterText.horizontalAlignment = Left
+    elif engine.keyWasPressed(F2):
+      panel.horizontalAlignment = Center
+      counterText.horizontalAlignment = Center
+    elif engine.keyWasPressed(F3):
+      panel.horizontalAlignment = Right
+      counterText.horizontalAlignment = Right
+    elif engine.keyWasPressed(F4):
+      panel.verticalAlignment = Top
+      counterText.verticalAlignment = Top
+    elif engine.keyWasPressed(F5):
+      panel.verticalAlignment = Center
+      counterText.verticalAlignment = Center
+    elif engine.keyWasPressed(F6):
+      panel.verticalAlignment = Bottom
+      counterText.verticalAlignment = Bottom
+
+    engine.processEventsFor(panel)
 
     panel.refresh()
+    counterText.refresh()
     origin.refresh()
     help_text.refresh()