问题描述
这个问题纯粹基于GestureDetector
颤动.
This question is purely based on GestureDetector
flutter.
例如:在应用程序中,实现了GestureDetector
类,因此在默认情况下,它支持多点触摸,现在需要禁用此多点触摸,因此这可能是解决方案的最佳方法.
For Example: In Application, GestureDetector
class is implemented so here by-default it support multi-touch, now need to disable this multi-touch so what could be the best way of a solution.
GestureDetector
参考链接: https://docs.flutter.io /flutter/widgets/GestureDetector-class.html
推荐答案
创建OnlyOnePointerRecognizerWidget
小部件的实例,并将任何小部件作为子级传递给它. OnlyOnePointerRecognizerWidget
将仅识别一个指针.
Create instance of OnlyOnePointerRecognizerWidget
widget and pass any Widget as child to it. OnlyOnePointerRecognizerWidget
will recognize only one pointer.
import 'package:flutter/material.dart';
import 'package:flutter/gestures.dart';
class OnlyOnePointerRecognizer extends OneSequenceGestureRecognizer {
int _p = 0;
@override
void addPointer(PointerDownEvent event) {
startTrackingPointer(event.pointer);
if (_p == 0) {
resolve(GestureDisposition.rejected);
_p = event.pointer;
} else {
resolve(GestureDisposition.accepted);
}
}
@override
String get debugDescription => 'only one pointer recognizer';
@override
void didStopTrackingLastPointer(int pointer) {}
@override
void handleEvent(PointerEvent event) {
if (!event.down && event.pointer == _p) {
_p = 0;
}
}
}
class OnlyOnePointerRecognizerWidget extends StatelessWidget {
final Widget child;
OnlyOnePointerRecognizerWidget({this.child});
@override
Widget build(BuildContext context) {
return RawGestureDetector(
gestures: <Type, GestureRecognizerFactory>{
OnlyOnePointerRecognizer: GestureRecognizerFactoryWithHandlers<OnlyOnePointerRecognizer>(
() => OnlyOnePointerRecognizer(),
(OnlyOnePointerRecognizer instance) {},
),
},
child: child,
);
}
}
这篇关于如何使用Flutter在移动应用程序中禁用多点触摸的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!