From 9d095c16ee16178c5d4e4bc7d95d935de4b6c507 Mon Sep 17 00:00:00 2001
From: xiaodong <450468291@qq.com>
Date: Sat, 14 Mar 2020 21:51:57 +0800
Subject: [PATCH] =?UTF-8?q?[plcs#8888]=20=E5=8D=95=E7=82=B9=E8=A7=A6?=
 =?UTF-8?q?=E6=91=B8?=
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---
 lib/widget/only_one_pointer_widget.dart | 55 +++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 lib/widget/only_one_pointer_widget.dart

diff --git a/lib/widget/only_one_pointer_widget.dart b/lib/widget/only_one_pointer_widget.dart
new file mode 100644
index 0000000..32ff7c9
--- /dev/null
+++ b/lib/widget/only_one_pointer_widget.dart
@@ -0,0 +1,55 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/gestures.dart';
+
+/**
+ * 单点触摸的方案：https://xbuba.com/questions/51712287
+ */
+class OnlyOnePointerRecognizer extends OneSequenceGestureRecognizer {
+  int _p = 0;
+
+  @override
+  void addAllowedPointer(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,
+    );
+  }
+}