Continue work on itb

tools/itb/bin/itb_scroll

@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 import sys
+import os
 import time
 import random
 from selenium import webdriver
@@ -9,17 +10,15 @@ class ScrollController:
         options = webdriver.ChromeOptions()
         options.add_experimental_option("debuggerAddress", f"127.0.0.1:{debug_port}")
         self.driver = webdriver.Chrome(options=options)
+        
+        # Load JavaScript files
+        js_dir = os.path.join(os.path.dirname(__file__), "..", "js")
+        self.js_code = ""
+        with open(os.path.join(js_dir, "viewport.js")) as f:
+            self.js_code = f.read()
 
     def get_viewport_info(self) -> dict:
-        script = """
-        return {
-            scroll_x: window.pageXOffset,
-            scroll_y: window.pageYOffset,
-            max_scroll_x: Math.max(document.documentElement.scrollWidth - window.innerWidth, 0),
-            max_scroll_y: Math.max(document.documentElement.scrollHeight - window.innerHeight, 0)
-        };
-        """
-        return self.driver.execute_script(script)
+        return self.driver.execute_script(self.js_code + "; return getViewportInfo();")
 
     def smooth_scroll(self, target_x: int, target_y: int):
         viewport = self.get_viewport_info()