 <dd>
          A callback that is invoked whenever the <a href="../dart-ui/Window/devicePixelRatio.html">devicePixelRatio</a>,
<a href="../dart-ui/Window/physicalSize.html">physicalSize</a>, <a href="../dart-ui/Window/padding.html">padding</a>, <a href="../dart-ui/Window/viewInsets.html">viewInsets</a>, or <a href="../dart-ui/Window/systemGestureInsets.html">systemGestureInsets</a>
values change, for example when the device is rotated or when the
application is resized (e.g. when showing applications side-