support for scrolling up and down

scriptedbrowser/commands/base.php

@@ -98,6 +98,24 @@ function mousemoverel($main, $control, $options)
     return true;
 }
 
+/**
+ * scroll
+ *
+ * @param \ScriptedBrowser\Main $main
+ * @unused-param $main
+ * @param \ScriptedBrowser\Control $control control interface
+ * @unused-param $control
+ * @param array<string,mixed>  $options options
+ * @return bool always true
+ */
+function scroll($main, $control, $options)
+{
+    $amount = $options['parameter'];
+    $delay = $options['delay'];
+    $control->scroll(intval($amount), floatval($delay));
+    return true;
+}
+
 /**
  * sleep
  *

scriptedbrowser/control.php

@@ -273,6 +273,23 @@ class Control
         @socket_close($socket);
     }
 
+    /**
+     * scroll given amount
+     *
+     * @param int $amount
+     * @param float $delay delay per scroll
+     * @return void
+     */
+    public function scroll($amount, $delay)
+    {
+        $dir = $amount > 0 ? 5 : 4;
+        $count = abs($amount);
+        for ($i = 0; $i < $count; ++$i) {
+            fwrite($this->xdotool, "click $dir\n");
+            usleep($delay * 1000 * 1000);
+        }
+    }
+
     /**
      * find elements with given css selector
      *