public override void didUpdateWidget(StatefulWidget _oldWidget)
{
TransformerPageView oldWidget = _oldWidget as TransformerPageView;
this._transformer = this.widget.transformer;
int index = this.widget.index ?? 0;
bool created = false;
if (this._pageController != this.widget.pageController)
{
if (this.widget.pageController != null)
{
this._pageController = this.widget.pageController;
}
else
{
created = true;
this._pageController = new TransformerPageController(
initialPage: this.widget.index,
itemCount: this.widget.itemCount,
loop: this.widget.loop,
reverse: this.widget.transformer?.reverse ?? false);
}
}
if (this._pageController.getRenderIndexFromRealIndex(this._activeIndex) != index)
{
this._fromIndex = this._activeIndex = this._pageController.initialPage;
if (!created)
{
int initPage = this._pageController.getRealIndexFromRenderIndex(index);
this._pageController.animateToPage(initPage,
duration: this.widget.duration.Value, curve: this.widget.curve);
}
}
if (this._transformer != null)
{
WidgetsBinding.instance.addPostFrameCallback(this._onGetSize);
}
if (this._controller != this.getNotifier())
{
this._controller?.removeListener(this.onChangeNotifier);
this._controller = this.getNotifier();
this._controller?.addListener(this.onChangeNotifier);
}
base.didUpdateWidget(oldWidget);
}
public override void initState()
{
this._activeIndex = this.widget.index ?? 0;
if (this._isPageViewLayout())
{
this._pageController = new TransformerPageController(
initialPage: this.widget.index,
loop: this.widget.loop,
itemCount: this.widget.itemCount,
reverse: this.widget.transformer == null ? false : this.widget.transformer.reverse,
viewportFraction: this.widget.viewportFraction);
}
base.initState();
}
public override void initState()
{
this._transformer = this.widget.transformer;
this._pageController = this.widget.pageController;
if (this._pageController == null)
{
this._pageController = new TransformerPageController(
initialPage: this.widget.index,
itemCount: this.widget.itemCount,
loop: this.widget.loop,
reverse: this.widget.transformer?.reverse ?? false);
}
this._fromIndex = this._activeIndex = this._pageController.initialPage;
this._controller = this.getNotifier();
this._controller?.addListener(this.onChangeNotifier);
base.initState();
}
public TransformerPageView(
Key key = null,
int?index = null,
TimeSpan?duration = null,
Curve curve = null,
float viewportFraction = 1.0f,
bool loop = false,
Axis scrollDirection = Axis.horizontal,
ScrollPhysics physics = null,
bool pageSnapping = true,
ValueChanged <int> onPageChanged = null,
IndexController controller = null,
PageTransformer transformer = null,
IndexedWidgetBuilder itemBuilder = null,
TransformerPageController pageController = null,
int?itemCount = null
) : base(key: key)
{
D.assert(itemCount != null);
D.assert(itemCount == 0 || itemBuilder != null || transformer != null);
this.duration =
duration ?? TimeSpan.FromMilliseconds(TransformerPageViewUtils.kDefaultTransactionDuration);
this.index = index;
this.duration = duration;
this.curve = curve ?? Curves.ease;
this.viewportFraction = viewportFraction;
this.loop = loop;
this.scrollDirection = scrollDirection;
this.physics = physics;
this.pageSnapping = pageSnapping;
this.onPageChanged = onPageChanged;
this.controller = controller;
this.transformer = transformer;
this.itemBuilder = itemBuilder;
this.pageController = pageController;
this.itemCount = itemCount.Value;
}
public override void didUpdateWidget(StatefulWidget _oldWidget)
{
Swiper oldWidget = _oldWidget as Swiper;
base.didUpdateWidget(oldWidget);
if (this._isPageViewLayout())
{
if (this._pageController == null ||
(this.widget.index != oldWidget.index || this.widget.loop != oldWidget.loop ||
this.widget.itemCount != oldWidget.itemCount ||
this.widget.viewportFraction != oldWidget.viewportFraction ||
this._getReverse(this.widget) != this._getReverse(oldWidget)))
{
this._pageController = new TransformerPageController(
initialPage: this.widget.index,
loop: this.widget.loop,
itemCount: this.widget.itemCount,
reverse: this._getReverse(this.widget),
viewportFraction: this.widget.viewportFraction);
}
}
else
{
Window.instance.scheduleMicrotask(() => {
if (this._pageController != null)
{
this._pageController.dispose();
this._pageController = null;
}
});
}
if (this.widget.index != null && this.widget.index != this._activeIndex)
{
this._activeIndex = this.widget.index.Value;
}
}
public static TransformerPageView children(
Key key = null,
int?index = null,
TimeSpan?duration = null,
Curve curve = null,
float viewportFraction = 1.0f,
bool loop = false,
Axis scrollDirection = Axis.horizontal,
ScrollPhysics physics = null,
bool pageSnapping = true,
ValueChanged <int> onPageChanged = null,
IndexController controller = null,
PageTransformer transformer = null,
List <Widget> children = null,
TransformerPageController pageController = null
)
{
D.assert(children != null);
return(new TransformerPageView(
itemCount: children.Count,
itemBuilder: (context, _index) => children[index: _index],
pageController: pageController,
transformer: transformer,
pageSnapping: pageSnapping,
key: key,
index: index,
duration: duration,
curve: curve,
viewportFraction: viewportFraction,
loop: loop,
scrollDirection: scrollDirection,
physics: physics,
onPageChanged: onPageChanged,
controller: controller
));
}