Display focus slate script

function getRectCenter(rect) {
  return {
    x: rect.x + rect.width/2,
    y: rect.y + rect.height/2
  };
}

function getScreenForegroundWindow(id) {
  var center = getRectCenter(slate.screenForRef(id).rect());
  return slate.windowUnderPoint(center);
}

slate.bind('up:ctrl', function(win) {
  win.doOperation('focus', {
    direction: 'behind'
  });
});

slate.bind('down:ctrl', function(win) {
  win.doOperation('focus', {
    direction: 'behind'
  });
});

slate.bind('left:ctrl', function() {
  var wnd = getScreenForegroundWindow('0');
  wnd && wnd.focus();
});

slate.bind('right:ctrl', function() {
  var wnd = getScreenForegroundWindow('1');
  wnd && wnd.focus();
});