MultiPage constructor
      
      MultiPage({ 
    
    
- PageTheme? pageTheme,
- PdfPageFormat? pageFormat,
- required BuildListCallback build,
- MainAxisAlignment mainAxisAlignment = MainAxisAlignment.start,
- CrossAxisAlignment crossAxisAlignment = CrossAxisAlignment.start,
- BuildCallback? header,
- ThemeData? theme,
- int maxPages = 20,
- PageOrientation? orientation,
- EdgeInsetsGeometry? margin,
- TextDirection? textDirection,
Implementation
MultiPage({
  PageTheme? pageTheme,
  PdfPageFormat? pageFormat,
  required BuildListCallback build,
  this.mainAxisAlignment = MainAxisAlignment.start,
  this.crossAxisAlignment = CrossAxisAlignment.start,
  this.header,
  this.footer,
  ThemeData? theme,
  this.maxPages = 20,
  PageOrientation? orientation,
  EdgeInsetsGeometry? margin,
  TextDirection? textDirection,
})  : _buildList = build,
      assert(maxPages > 0),
      super(
        pageTheme: pageTheme,
        pageFormat: pageFormat,
        build: (_) => SizedBox(),
        margin: margin,
        theme: theme,
        orientation: orientation,
        textDirection: textDirection,
      );