didChangeTextScaleFactor method

@protected @override @mustCallSuper void didChangeTextScaleFactor()

Called when the platform's text scale factor changes.

Implementation

@protected
@override
@mustCallSuper
void didChangeTextScaleFactor() {
  ///
  /// This typically happens as the result of the user changing system
  /// preferences, and it should affect all of the text sizes in the
  /// application.
  ///
  /// This method exposes notifications from [Window.onTextScaleFactorChanged].
  /// See sample code below. No need to call super if you override.
  ///   @override
  ///   void didChangeTextScaleFactor() {
  ///     setState(() { _lastTextScaleFactor = ui.window.textScaleFactor; });
  ///   }

  // A triggered system event
  _hadSystemEvent = true;

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

  for (final listener in _beforeList) {
    listener.didChangeTextScaleFactor();
  }
  for (final con in _controllerList) {
    con.didChangeTextScaleFactor();
  }
  for (final listener in _afterList) {
    listener.didChangeTextScaleFactor();
  }

  _setStateAllowed = true;

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