didChangeMetrics method

@protected @override @mustCallSuper void didChangeMetrics()

Called when the application's dimensions change. For example, when a phone is rotated.

Implementation

@protected
@override
@mustCallSuper
void didChangeMetrics() {
  /// In general, this is not overridden often as the layout system takes care of
  /// automatically recomputing the application geometry when the application
  /// size changes
  ///
  /// This method exposes notifications from [Window.onMetricsChanged].
  /// See sample code below. No need to call super if you override.
  ///   @override
  ///   void didChangeMetrics() {
  ///     setState(() { _lastSize = ui.window.physicalSize; });
  ///   }

  // A triggered system event
  _hadSystemEvent = true;

  /// No 'setState()' functions are allowed to fully function at this point.
  _setStateAllowed = false;

  for (final con in _controllerList) {
    con.didChangeMetrics();
  }

  _setStateAllowed = true;

  if (_setStateRequested) {
    _setStateRequested = false;
    // Only the latest State is rebuilt
    if (isEndState) {
      /// Perform a 'rebuild' if requested.
      setState(() {});
    }
  }
}