toggleTheme static method
      
void
toggleTheme()
      
     
    
    
Implementation
static void toggleTheme() {
  _currentTheme =
      _currentTheme == ChartTheme.light ? ChartTheme.dark : ChartTheme.light;
}static void toggleTheme() {
  _currentTheme =
      _currentTheme == ChartTheme.light ? ChartTheme.dark : ChartTheme.light;
}