public override Widget build(BuildContext context)
{
AxisDirection?axisDirection = _getDirection(context);
ScrollPhysics physics = new _ForceImplicitScrollPhysics(
allowImplicitScrolling: widget.allowImplicitScrolling
).applyTo(widget.pageSnapping
? PageViewUtils._kPagePhysics.applyTo(widget.physics)
: widget.physics);
return(new NotificationListener <ScrollNotification>(
onNotification: (ScrollNotification notification) => {
if (notification.depth == 0 && widget.onPageChanged != null &&
notification is ScrollUpdateNotification)
{
IPageMetrics metrics = (IPageMetrics)notification.metrics;
int currentPage = metrics.page.round();
if (currentPage != _lastReportedPage)
{
_lastReportedPage = currentPage;
widget.onPageChanged(currentPage);
}
}
return false;
},
child: new Scrollable(
dragStartBehavior: widget.dragStartBehavior,
axisDirection: axisDirection,
controller: widget.controller,
physics: physics,
viewportBuilder: (BuildContext _context, ViewportOffset position) => {
return new Viewport(
cacheExtent: widget.allowImplicitScrolling ? 1.0f : 0.0f,
cacheExtentStyle: CacheExtentStyle.viewport,
axisDirection: axisDirection,
offset: position,
slivers: new List <Widget> {
new SliverFillViewport(
viewportFraction: widget.controller.viewportFraction,
_delegate: widget.childrenDelegate
)
}
);
}
)
));
}
public override Widget build(BuildContext context)
{
AxisDirection axisDirection = this._getDirection(context);
ScrollPhysics physics = this.widget.pageSnapping
? PageViewUtils._kPagePhysics.applyTo(this.widget.physics)
: this.widget.physics;
return(new NotificationListener <ScrollNotification>(
onNotification: (ScrollNotification notification) => {
if (notification.depth == 0 && this.widget.onPageChanged != null &&
notification is ScrollUpdateNotification)
{
IPageMetrics metrics = (IPageMetrics)notification.metrics;
int currentPage = metrics.page.round();
if (currentPage != this._lastReportedPage)
{
this._lastReportedPage = currentPage;
this.widget.onPageChanged(currentPage);
}
}
return false;
},
child: new Scrollable(
axisDirection: axisDirection,
controller: this.widget.controller,
physics: physics,
viewportBuilder: (BuildContext _context, ViewportOffset position) => {
return new Viewport(
cacheExtent: 0.0f,
axisDirection: axisDirection,
offset: position,
slivers: new List <Widget> {
new SliverFillViewport(
viewportFraction: this.widget.controller.viewportFraction,
del: this.widget.childrenDelegate
)
}
);
}
)
));
}
