我目前正在使用carousel-slider库在Flutter中获取旋转木马。
该库基于PageView,在PageView中元素居中。
那是我得到的旋转木马:
这就是我想要的:
以下是使用CarouselSlider的代码:
CarouselSlider(
height: 150,
viewportFraction: 0.5,
initialPage: 0,
enableInfiniteScroll: false,
items: widget.user.lastGamesPlayed.map((game) {
return Builder(
builder: (BuildContext context) {
return Padding(
padding: EdgeInsets.symmetric(horizontal: 10),
child: GestureDetector(
onTap: () {
game.presentGame(context, widget.user);
},
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(25)),
child: Container(
color: Theme.MyColors.lightBlue,
child: Center(
child: Padding(
padding: EdgeInsets.all(20),
child: AutoSizeText(game.name,
style: TextStyle(fontSize: 70),
maxLines: 1)),
),
))));
},
);
}).toList(),
)
这是CarouselSlider库中的代码:
@override
Widget build(BuildContext context) {
return getWrapper(PageView.builder(
physics: widget.isScrollEnabled
? AlwaysScrollableScrollPhysics()
: NeverScrollableScrollPhysics(),
scrollDirection: widget.scrollDirection,
controller: widget.pageController,
reverse: widget.reverse,
itemCount: widget.enableInfiniteScroll ? null : widget.items.length,
onPageChanged: (int index) {
int currentPage =
_getRealIndex(index, widget.realPage, widget.items.length);
if (widget.onPageChanged != null) {
widget.onPageChanged(currentPage);
}
},
itemBuilder: (BuildContext context, int i) {
final int index = _getRealIndex(
i + widget.initialPage, widget.realPage, widget.items.length);
return AnimatedBuilder(
animation: widget.pageController,
child: widget.items[index],
builder: (BuildContext context, child) {
// on the first render, the pageController.page is null,
// this is a dirty hack
if (widget.pageController.position.minScrollExtent == null ||
widget.pageController.position.maxScrollExtent == null) {
Future.delayed(Duration(microseconds: 1), () {
setState(() {});
});
return Container();
}
double value = widget.pageController.page - i;
value = (1 - (value.abs() * 0.3)).clamp(0.0, 1.0);
final double height = widget.height ??
MediaQuery.of(context).size.width * (1 / widget.aspectRatio);
final double distortionValue = widget.enlargeCenterPage
? Curves.easeOut.transform(value)
: 1.0;
if (widget.scrollDirection == Axis.horizontal) {
return Center(
child:
SizedBox(height: distortionValue * height, child: child));
} else {
return Center(
child: SizedBox(
width:
distortionValue * MediaQuery.of(context).size.width,
child: child));
}
},
);
},
));
}
如何防止元素居中?
先感谢您
这是旋转木马Slider中的一个参数,名为:enlarge CenterPage:make it true,这是我的代码,对我来说很好,
static List<String> imgList; //list of String link of pictures
static List<T> map<T>(List list, Function handler) {
List<T> result = [];
for (var i = 0; i < list.length; i++) {
result.add(handler(i, list[i]));
}
return result;
}
int _current = 0;
CarouselSlider(
items: map<Widget>(
imgList,
(index, i) {
return Container(
margin: EdgeInsets.all(5.0),
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(5.0)),
child: Stack(children: <Widget>[
Image.network(i, fit: BoxFit.cover, width: 1000.0),
Positioned(
bottom: 0.0,
left: 0.0,
right: 0.0,
child: Container(
decoration: BoxDecoration(
gradient: LinearGradient(
colors: [
Color.fromARGB(200, 0, 0, 0),
Color.fromARGB(0, 0, 0, 0)
],
begin: Alignment.bottomCenter,
end: Alignment.topCenter,
),
),
padding: EdgeInsets.symmetric(
vertical: 10.0, horizontal: 20.0),
child: Text(
'No. $index image',
style: TextStyle(
color: Colors.white,
fontSize: 20.0,
fontWeight: FontWeight.bold,
),
),
),
),
]),
),
);
},
).toList(),
autoPlay: true,
enlargeCenterPage: true,
aspectRatio: 2.0,
onPageChanged: (index) {
setState(() {
_current = index;
});
},
)