public Widget BulidTopSwiper(List <string> urls)
{
List <Widget> children = new List <Widget>();
foreach (var item in urls)
{
Widget it = Image.network(item, fit: BoxFit.fill);
children.Add(it);
}
TransformerPageController controller = new TransformerPageController(initialPage: 0, itemCount: urls.Count);
return(new Container(
height: 270,
width: 375,
child: new Stack(
children: new List <Widget> {
TransformerPageView.children(index: 0,
children: children, pageController: controller
),
new Align(
alignment: Alignment.bottomCenter,
child: new Padding(
padding: EdgeInsets.only(bottom: 20),
child: new PageIndicator(layout: PageIndicatorLayout.WARM, size: 7, activeSize: 7, controller: controller, space: 5.0f, count: urls.Count
, color: new Unity.UIWidgets.ui.Color(0xFFEAEAEA), activeColor: new Unity.UIWidgets.ui.Color(0xFF404759))
)
)
}
)
));
}
public override void initState()
{
_transformer = widget.transformer;
// int index = widget.index ?? 0;
_pageController = widget.pageController;
if (_pageController == null)
{
_pageController = new TransformerPageController(
initialPage: widget.index,
itemCount: widget.itemCount,
loop: widget.loop,
reverse:
widget.transformer == null ? false : widget.transformer.reverse);
}
// int initPage = _getRealIndexFromRenderIndex(index);
// _pageController = new PageController(initialPage: initPage,viewportFraction: widget.viewportFraction);
_fromIndex = _activeIndex = _pageController.initialPage;
_controller = getNotifier();
if (_controller != null)
{
_controller.addListener(onChangeNotifier);
}
base.initState();
}
public override void didUpdateWidget(StatefulWidget oldWidget)
{
_transformer = widget.transformer;
int index = widget.index;
bool created = false;
if (_pageController != widget.pageController)
{
if (widget.pageController != null)
{
_pageController = widget.pageController;
}
else
{
created = true;
_pageController = new TransformerPageController(
initialPage: widget.index,
itemCount: widget.itemCount,
loop: widget.loop,
reverse: widget.transformer == null
? false
: widget.transformer.reverse);
}
}
if (_pageController.getRenderIndexFromRealIndex(_activeIndex) != index)
{
_fromIndex = _activeIndex = _pageController.initialPage;
if (!created)
{
int initPage = _pageController.getRealIndexFromRenderIndex(index);
_pageController.animateToPage(initPage,
duration: widget.duration, curve: widget.curve);
}
}
if (_transformer != null)
{
WidgetsBinding.instance.addPostFrameCallback(_onGetSize);
}
if (_controller != getNotifier())
{
if (_controller != null)
{
_controller.removeListener(onChangeNotifier);
}
_controller = getNotifier();
if (_controller != null)
{
_controller.addListener(onChangeNotifier);
}
}
base.didUpdateWidget(oldWidget);
}
public override void initState()
{
_activeIndex = widget.index;
if (_isPageViewLayout())
{
_pageController = new TransformerPageController(
initialPage: widget.index,
loop: widget.loop,
itemCount: widget.itemCount,
reverse:
widget.transformer == null ? false : widget.transformer.reverse,
viewportFraction: widget.viewportFraction);
}
base.initState();
}
public override void didUpdateWidget(StatefulWidget oldWidget)
{
base.didUpdateWidget(oldWidget);
Swiper sp = oldWidget as Swiper;
if (_isPageViewLayout() && sp != null)
{
if (_pageController == null ||
(widget.index != sp.index ||
widget.loop != sp.loop ||
widget.itemCount != sp.itemCount ||
widget.viewportFraction != sp.viewportFraction ||
_getReverse(widget) != _getReverse(sp)))
{
_pageController = new TransformerPageController(
initialPage: widget.index,
loop: widget.loop,
itemCount: widget.itemCount,
reverse: _getReverse(widget),
viewportFraction: widget.viewportFraction);
}
}
else
{
//scheduleMicrotask(() =>
//{
// // So that we have a chance to do `removeListener` in child widgets.
// if (_pageController != null)
// {
// _pageController.dispose();
// _pageController = null;
// }
//});
}
//if (widget.index != null && widget.index != _activeIndex)
//{
// _activeIndex = widget.index;
//}
//TODO:Check widget.index != null or widget.index != 0
if (widget.index != _activeIndex)
{
_activeIndex = widget.index;
}
}
public static TransformerPageView children(
int index,
TimeSpan?duration = null,
Curve curve = null,
Key key = null,
ScrollPhysics physics = null,
ValueChanged <int> onPageChanged = null,
IndexController controller = null,
TransformerPageController pageController = null,
PageTransformer transformer = null,
List <Widget> children = null,
float viewportFraction = 1,
bool pageSnapping = true,
bool loop = false,
Axis scrollDirection = Axis.horizontal
)
{
return(new TransformerPageView(
itemCount: children.Count,
itemBuilder: (BuildContext context, int ind) =>
{
return children[ind];
},
pageController: pageController,
transformer: transformer,
pageSnapping: pageSnapping,
key: key,
index: index,
duration: duration,
curve: curve ?? Curves.ease,
viewportFraction: viewportFraction,
scrollDirection: scrollDirection,
physics: physics,
onPageChanged: onPageChanged,
controller: controller
));
}
/// Creates a scrollable list that works page by page using widgets that are
/// created on demand.
///
/// This constructor is appropriate for page views with a large (or infinite)
/// number of children because the builder is called only for those children
/// that are actually visible.
///
/// Providing a non-null [itemCount] lets the [PageView] compute the maximum
/// scroll extent.
///
/// [itemBuilder] will be called only with indices greater than or equal to
/// zero and less than [itemCount].
public TransformerPageView(
int index,
Curve curve,
ScrollPhysics physics,
ValueChanged <int> onPageChanged,
IndexController controller,
PageTransformer transformer,
IndexedWidgetBuilder itemBuilder,
TransformerPageController pageController,
int itemCount,
TimeSpan?duration = null,
Key key = null,
float viewportFraction = 1,
Axis scrollDirection = Axis.horizontal,
bool loop = false,
bool pageSnapping = true
) : base(key: key)
{
this.index = index;
this.curve = curve == null ? Curves.ease : curve;
this.loop = loop;
this.scrollDirection = scrollDirection;
this.physics = physics;
this.onPageChanged = onPageChanged;
this.controller = controller;
this.transformer = transformer;
this.itemBuilder = itemBuilder;
this.pageController = pageController;
this.itemCount = itemCount;
this.viewportFraction = viewportFraction;
this.scrollDirection = scrollDirection;
this.loop = loop;
this.pageSnapping = pageSnapping;
this.duration = duration ?? TimeSpan.FromMilliseconds(kDefaultTransactionDuration);
}
public override void initState()
{
controller = new TransformerPageController(itemCount: 4, loop: false, reverse: false);
base.initState();
}
