how to preload pageviews data fluter
PageController _controller;
ZoomableImage currPage, nextPage;
Future<List<CachedNetworkImageProvider>> _loadAllImages(Book book) async {
List<CachedNetworkImageProvider> cachedImages = [];
for(int i=0;i<book.numPages;i++) {
var configuration = createLocalImageConfiguration(context);
cachedImages.add(new CachedNetworkImageProvider("https://example.com/${bookId}/${index+1}.jpg}")..resolve(configuration));
}
return cachedImages;
}
FutureBuilder<List<CachedNetworkImageProvider>> _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),
);
}