Flutter：从GestureDetector获取本地位置

Flutter：从GestureDetector获取本地位置

您可以使用a

RenderObject

，然后将全局位置转换为本地位置，类似于此简单示例：

import "package:flutter/material.dart";class Test extends StatefulWidget {  @override  _TestState createState() => new _TestState();}class _TestState extends State<Test> {  _onDragStart(BuildContext context, DragStartDetails start) {    print(start.globalPosition.toString());    RenderBox getBox = context.findRenderObject();    var local = getBox.globalToLocal(start.globalPosition);    print(local.dx.toString() + "|" + local.dy.toString());  }  _onDragUpdate(BuildContext context, DragUpdateDetails update) {    //print(update.globalPosition.toString());    RenderBox getBox = context.findRenderObject();    var local = getBox.globalToLocal(update.globalPosition);    //print(local.dx.toString() + "|" + local.dy.toString());  }  @override  Widget build(BuildContext context) {    return new Scaffold(      body: new Center(        child: new GestureDetector(          child: new Text("Drag"),          onHorizontalDragStart: (DragStartDetails start) =>   _onDragStart(context, start),          onHorizontalDragUpdate: (DragUpdateDetails update) =>   _onDragUpdate(context, update),        ),      ),    );  }}