public static Future precacheImage(
ImageProvider provider,
BuildContext context,
Size size = null,
ImageErrorListener onError = null
)
{
var config = createLocalImageConfiguration(context: context, size: size);
var completer = Completer.create();
var stream = provider.resolve(configuration: config);
ImageStreamListener listener = null;
listener = new ImageStreamListener(
(image, sync) => {
if (!completer.isCompleted)
{
completer.complete();
}
SchedulerBinding.instance.addPostFrameCallback(timeStamp => {
stream.removeListener(listener: listener);
});
},
onError: error => {
if (!completer.isCompleted)
{
completer.complete();
}
stream.removeListener(listener: listener);
UIWidgetsError.reportError(new UIWidgetsErrorDetails(
context: new ErrorDescription("image failed to precache"),
library: "image resource service",
silent: true));
}
);
stream.addListener(listener: listener);
return(completer.future);
}
//TODO add capture type (camera, video, image)
//TODO add auto-loop option
public ImageStream(ImageStreamListener streamListener)
{
this.listener = streamListener;
}
