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._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 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
));
}
Widget _buildSwiper()
{
IndexedWidgetBuilder itemBuilder = this.widget.onTap != null ? this._wrapTap : this.widget.itemBuilder;
if (this.widget.layout == SwiperLayout.stack)
{
return(new _StackSwiper(
loop: this.widget.loop,
itemWidth: this.widget.itemWidth,
itemHeight: this.widget.itemHeight,
itemCount: this.widget.itemCount,
itemBuilder: itemBuilder,
index: this._activeIndex,
curve: this.widget.curve,
duration: this.widget.duration,
onIndexChanged: this._onIndexChanged,
controller: this._controller,
scrollDirection: this.widget.scrollDirection
));
}
else if (this._isPageViewLayout())
{
PageTransformer transformer = this.widget.transformer;
if (this.widget.scale != null || this.widget.fade != null)
{
transformer = new ScaleAndFadeTransformer(scale: this.widget.scale, fade: this.widget.fade);
}
Widget child = new TransformerPageView(
pageController: this._pageController,
loop: this.widget.loop,
itemCount: this.widget.itemCount,
itemBuilder: itemBuilder,
transformer: transformer,
viewportFraction: this.widget.viewportFraction,
index: this._activeIndex,
duration: TimeSpan.FromMilliseconds(this.widget.duration),
scrollDirection: this.widget.scrollDirection,
onPageChanged: this._onIndexChanged,
curve: this.widget.curve,
physics: this.widget.physics,
controller: this._controller
);
if (this.widget.autoplayDisableOnInteraction && this.widget.autoplay)
{
return(new NotificationListener <ScrollNotification>(
child: child,
onNotification: notification => {
if (notification is ScrollStartNotification scrollStartNotification)
{
if (scrollStartNotification.dragDetails != null)
{
if (this._timer != null)
{
this._stopAutoplay();
}
}
}
else if (notification is ScrollEndNotification)
{
if (this._timer == null)
{
this._startAutoplay();
}
}
return false;
}
));
}
return(child);
}
else if (this.widget.layout == SwiperLayout.tinder)
{
return(new _TinderSwiper(
loop: this.widget.loop,
itemWidth: this.widget.itemWidth,
itemHeight: this.widget.itemHeight,
itemCount: this.widget.itemCount,
itemBuilder: itemBuilder,
index: this._activeIndex,
curve: this.widget.curve,
duration: this.widget.duration,
onIndexChanged: this._onIndexChanged,
controller: this._controller,
scrollDirection: this.widget.scrollDirection
));
}
else if (this.widget.layout == SwiperLayout.custom)
{
return(new _CustomLayoutSwiper(
loop: this.widget.loop,
option: this.widget.customLayoutOption,
itemWidth: this.widget.itemWidth,
itemHeight: this.widget.itemHeight,
itemCount: this.widget.itemCount,
itemBuilder: itemBuilder,
index: this._activeIndex,
curve: this.widget.curve,
duration: this.widget.duration,
onIndexChanged: this._onIndexChanged,
controller: this._controller,
scrollDirection: this.widget.scrollDirection
));
}
else
{
return(new Container());
}
}
public Swiper(
IndexedWidgetBuilder itemBuilder = null,
PageIndicatorLayout indicatorLayout = PageIndicatorLayout.none,
PageTransformer transformer = null,
int?itemCount = null,
bool autoplay = false,
SwiperLayout layout = SwiperLayout.normal,
int autoplayDelay = SwiperUtils.kDefaultAutoplayDelayMs,
bool autoplayDisableOnInteraction = true,
int duration = SwiperUtils.kDefaultAutoplayTransactionDuration,
ValueChanged <int> onIndexChanged = null,
int?index = null,
SwiperOnTap onTap = null,
SwiperPlugin control = null,
bool loop = true,
Curve curve = null,
Axis scrollDirection = Axis.horizontal,
SwiperPlugin pagination = null,
List <SwiperPlugin> plugins = null,
ScrollPhysics physics = null,
Key key = null,
SwiperController controller = null,
CustomLayoutOption customLayoutOption = null,
float?containerHeight = null,
float?containerWidth = null,
float viewportFraction = 1.0f,
float?itemHeight = null,
float?itemWidth = null,
bool?outer = false,
float?scale = null,
float?fade = null
) : base(key: key)
{
D.assert(itemBuilder != null || transformer != null,
() => "itemBuilder and transformItemBuilder must not be both null");
D.assert(!loop || ((loop && layout == SwiperLayout.normal &&
(indicatorLayout == PageIndicatorLayout.scale ||
indicatorLayout == PageIndicatorLayout.color ||
indicatorLayout == PageIndicatorLayout.none)) ||
(loop && layout != SwiperLayout.normal)),
() => "Only support `PageIndicatorLayout.SCALE` and `PageIndicatorLayout.COLOR`when layout==SwiperLayout.DEFAULT in loop mode"
);
this.itemBuilder = itemBuilder;
this.indicatorLayout = indicatorLayout;
this.transformer = transformer;
this.itemCount = itemCount;
this.autoplay = autoplay;
this.layout = layout;
this.autoplayDelay = autoplayDelay;
this.autoplayDisableOnInteraction = autoplayDisableOnInteraction;
this.duration = duration;
this.onIndexChanged = onIndexChanged;
this.index = index;
this.onTap = onTap;
this.control = control;
this.loop = loop;
this.curve = curve ?? Curves.ease;
this.scrollDirection = scrollDirection;
this.pagination = pagination;
this.plugins = plugins;
this.physics = physics;
this.controller = controller;
this.customLayoutOption = customLayoutOption;
this.containerHeight = containerHeight;
this.containerWidth = containerWidth;
this.viewportFraction = viewportFraction;
this.itemHeight = itemHeight;
this.itemWidth = itemWidth;
this.outer = outer;
this.scale = scale;
this.fade = fade;
}
