forked from lxm_flutter/FlutterUnit
55 lines
2.0 KiB
Dart
55 lines
2.0 KiB
Dart
import 'package:flutter/material.dart';
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/// create by 张风捷特烈 on 2020-03-25
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/// contact me by email 1981462002@qq.com
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/// 说明:
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// {
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// "widgetId": 146,
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// "name": 'GestureDetector的Pan事件',
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// "priority": 3,
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// "subtitle":
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// "【onPanDown】 : 按下回调 【GestureDragDownCallback】\n"
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// "【onPanEnd】 : 拖动结束 【GestureDragEndCallback】\n"
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// "【onPanStart】 : 开始拖动 【GestureDragStartCallback】\n"
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// "【onPanUpdate】 : 拖动更新 【GestureDragUpdateCallback】\n"
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// "【onPanCancel】 : 拖动取消 【GestureDragCancelCallback】",
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// }
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class PanGestureDetector extends StatefulWidget {
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const PanGestureDetector({Key? key}) : super(key: key);
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@override
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_PanGestureDetectorState createState() => _PanGestureDetectorState();
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}
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class _PanGestureDetectorState extends State<PanGestureDetector> {
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String _info = '';
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@override
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Widget build(BuildContext context) {
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return GestureDetector(
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onPanDown: (detail) => setState(() => _info =
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'onPanDown:\n相对落点:${detail.localPosition}\n绝对落点:${detail.globalPosition}'),
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onPanEnd: (detail) => setState(() => _info =
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'onPanEnd:\n初速度:${detail.primaryVelocity}\n最终速度:${detail.velocity}'),
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onPanUpdate: (detail) => setState(() => _info =
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'onPanUpdate:\n相对落点:${detail.localPosition}\n绝对落点:${detail.globalPosition}'),
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onPanStart: (detail) => setState(() => _info =
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'onPanStart:\n相对落点:${detail.localPosition}\n绝对落点:${detail.globalPosition}'),
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onPanCancel: () => setState(() => _info = 'onTapCancel'),
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child: SingleChildScrollView(
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child: Container(
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alignment: Alignment.center,
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width: 300,
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height: 300 * 0.618,
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color: Colors.grey.withAlpha(33),
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child: Text(
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_info,
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style: const TextStyle(fontSize: 18, color: Colors.blue),
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),
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),
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),
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);
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}
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}
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