import 'package:Flutter/material.dart';
class SwipeDetectorExample extends StatefulWidget {
final Function() onSwipeUp;
final Function() onSwipeDown;
final Widget child;
SwipeDetectorExample({this.onSwipeUp, this.onSwipeDown, this.child});
@override
_SwipeDetectorExampleState createState() => _SwipeDetectorExampleState();
}
class _SwipeDetectorExampleState extends State<SwipeDetectorExample> {
//Vertical drag details
DragStartDetails startVerticalDragDetails;
DragUpdateDetails updateVerticalDragDetails;
@override
Widget build(BuildContext context) {
return GestureDetector(
onVerticalDragStart: (dragDetails) {
startVerticalDragDetails = dragDetails;
},
onVerticalDragUpdate: (dragDetails) {
updateVerticalDragDetails = dragDetails;
},
onVerticalDragEnd: (endDetails) {
double dx = updateVerticalDragDetails.globalPosition.dx -
startVerticalDragDetails.globalPosition.dx;
double dy = updateVerticalDragDetails.globalPosition.dy -
startVerticalDragDetails.globalPosition.dy;
double veLocity = endDetails.primaryVeLocity;
//Convert values to be positive
if (dx < 0) dx = -dx;
if (dy < 0) dy = -dy;
if (veLocity < 0) {
widget.onSwipeUp();
} else {
widget.onSwipeDown();
}
},
child: widget.child);
}
}
在Flutter中检测垂直滑动方向
在Flutter中检测垂直滑动方向
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