// TODO: better logic that doesn't poll all the time
sclass JSSendMouseEventsToWebSocket {
  int interval = 100; // 0 for continuous
  bool verbose;
  
  S html() {
    ret hjs(js());
  }
  
  S js() {
    O[] params = litparams(+interval, +verbose);
    
    if (interval == 0) ret replaceDollarVars([[
      console.log("Note: Streaming mouse events to web socket.");
      
      var mouseVerbose = $verbose;
      var mouseX = -1, mouseY = -1;
      
      function wsSendMouse() {
        if (wsReady) {
          var msg = JSON.stringify({"mouse": [mouseX, mouseY]});
          if (mouseVerbose) console.log(msg);
          ws.send(msg);
        }
      }
      
      $("body").mousemove(function(e) {
        mouseX = e.pageX;
        mouseY = e.pageY;
        wsSendMouse();
      });
    ]], params);
    
    ret replaceDollarVars([[
      var mouseInterval = $interval;
      var mouseX = -1, mouseY = -1;
      
      $("body").mousemove(function(e) {
        mouseX = e.pageX;
        mouseY = e.pageY;
      });
      
      function wsSendMouse() {
        if (wsReady)
          ws.send(JSON.stringify({"mouse": [mouseX, mouseY]}));
      }
      
      setTimeout(function sendMouse, mouseInterval);
    ]], params);
  }
}

Began life as a copy of #1031659