我想使用带有垂直轴的PageView
,并使用鼠标滚动在页面之间移动,但是当我使用鼠标滚动时,页面不滚动...仅当我滚动页面时,单击并向上/向下滑动。
有什么办法吗?
我要保留财产pageSnapping: true
问题:
当我尝试鼠标滚动页面时,它没有变化,只是回到初始偏移量。 但是当我单击并滑动时...
class Body extends StatefulWidget {
@override
_BodyState createState() => _BodyState();
}
class _BodyState extends State<Body> {
PageController _controller = PageController(keepPage: true);
@override
void initState() {
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
height: Sizing.size.height,
width: Sizing.size.width,
child: Stack(
children: <Widget>[
PageView(
scrollDirection: Axis.vertical,
controller: _controller,
children: <Widget>[
Container(color: Colors.red),
Container(color: Colors.blue),
Container(color: Colors.orange),
],
),
],
),
),
);
}
}
答案 0 :(得分:0)
要使内容总体上可滚动,可以将小部件(>>右键单击要使其可滚动的小部件>>重构>>用小部件包装)在SingleChildScrollView()
中。
答案 1 :(得分:0)
要使用鼠标滚动,必须通过设置来禁用PageView
的移动
physics: NeverScrollableScrollPhysics()
。
然后,您必须通过Listener
手动拦截鼠标滚动。如果您还想通过滑动来恢复PageView经典移动,则必须使用GestureDetector
。
这是示例代码:
class _HomepageState extends State<Homepage> {
final PageController pageController = PageController();
// this is like a lock that prevent update the PageView multiple times while is
// scrolling
bool pageIsScrolling = false;
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: GestureDetector(
// to detect swipe
onPanUpdate: (details) {
_onScroll(details.delta.dy * -1);
},
child: Listener(
// to detect scroll
onPointerSignal: (pointerSignal) {
if (pointerSignal is PointerScrollEvent) {
_onScroll(pointerSignal.scrollDelta.dy);
}
},
child: PageView(
scrollDirection: Axis.vertical,
controller: pageController,
physics: NeverScrollableScrollPhysics(),
pageSnapping: true,
children: [
Container(color: Colors.red),
Container(color: Colors.blue),
Container(color: Colors.orange),
],
),
),
)),
);
}
void _onScroll(double offset) {
if (pageIsScrolling == false) {
pageIsScrolling = true;
if (offset > 0) {
pageController
.nextPage(
duration: Duration(milliseconds: 300),
curve: Curves.easeInOut)
.then((value) => pageIsScrolling = false);
print('scroll down');
} else {
pageController
.previousPage(
duration: Duration(milliseconds: 300),
curve: Curves.easeInOut)
.then((value) => pageIsScrolling = false);
print('scroll up');
}
}
}
}
答案 2 :(得分:0)
感谢卢卡!
我只是修改了整个事情来做同样的事情,问的是什么问题。
Listener(
onPointerMove: (pointerMove) {
if (pointerMove is PointerMoveEvent) {
_onScroll(pointerMove.delta.dy * -1);
print(pointerMove.delta.dy);
}
},
onPointerSignal: (pointerSignal) {
if (pointerSignal is PointerScrollEvent) {
_onScroll(pointerSignal.scrollDelta.dy);
print(pointerSignal.scrollDelta.dy);
}
},
child: SingleChildScrollView(
child: Container(
constraints: BoxConstraints(
minHeight: SizeConfig.screenHeight * .9),
width: SizeConfig.screenWidth,
height: SizeConfig.screenWidth / 2,
decoration: BoxDecoration(
image: DecorationImage(
alignment: Alignment.centerRight,
image: AssetImage(
'assets/images/background_circles.png'))),
child: PageView(
controller: _pageController,
physics: NeverScrollableScrollPhysics(),
pageSnapping: true,
scrollDirection: Axis.vertical,
children: [