I want to use a PageView with vertical axis and move between the pages using the mouse-scroll, but when I use the mouse-scroll the page don't scroll... The page only scroll when I click and swipe to up/down.
There is any way to do that?
I want to keep the property pageSnapping: true
The problem:
When I try to mouse-scroll the page, it don't change, it just back to initial offset. But when I click and swipe works...
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),
],
),
],
),
),
);
}
}
Solution 1: user13374179
To make stuff scrollable in general you can wrap the widget (>>right click on the widget you want to make scrollable>>refactor>>wrap with widget) in a SingleChildScrollView().
Solution 2: Luca Oropallo
To use the mouse scroll you must disable the movement of the PageView by setting
physics: NeverScrollableScrollPhysics().
Then you have to manually intercept the mouse scroll through a Listener. If you also want to recover the PageView classic movement through swipe you must use a GestureDetector.
Here is an example code:
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');
}
}
}
}
Solution 3: EngineSense
Thanks to Luca!
I just modified the entire thing to do the same, what was the question asked for.
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: [
