PageController _controller;
ZoomableImage currPage, nextPage;

Future> _loadAllImages(Book book) async {
  List cachedImages = [];
  for(int i=0;i> _futurePages(Book book) {
  return new FutureBuilder(
    future: _loadAllImages(book),
    builder: (BuildContext context, AsyncSnapshot snapshot){
      if(snapshot.hasData) {
        return new Container(
          child: PageView.builder(
            physics: new AlwaysScrollableScrollPhysics(),
            controller: _controller,
            itemCount: snapshot.data.length,
            itemBuilder: (BuildContext context, int index) {
              ImageProvider image = snapshot.data[index];
              return new ZoomableImage(
                image, 
                placeholder: new Center(
                  child: CupertinoActivityIndicator(),
                ),
              );
            },
            onPageChanged: (int index) {},
          ),
        );
      } else if(!snapshot.hasData) return new Center(child: CupertinoActivityIndicator());
    },
  );
}

@override
Widget build(BuildContext context) {
  return new Scaffold(
    body: _futurePages(widget.book),
  );
}