AnimatedDefaultTextStyle
Animated version of DefaultTextStyle which automatically transitions the default text style (the text style to apply to descendant Text widgets without explicit style) over a given duration whenever the given style changes.
Example
bool _first = true; double _fontSize = 60; Color _color = Colors.blue; Widget build(BuildContext context) { return Column( mainAxisSize: MainAxisSize.min, children: <Widget>[ Container( height: 120, child: AnimatedDefaultTextStyle( duration: const Duration(milliseconds: 300), style: TextStyle( fontSize: _fontSize, color: _color, fontWeight: FontWeight.bold, ), child: Text('Flutter'), ), ), FlatButton( onPressed: () { setState(() { _fontSize = _first ? 90 : 60; _color = _first ? Colors.blue : Colors.red; _first = !_first; }); }, child: Text( "CLICK ME!", ), ) ], ); }