forked from lxm_flutter/FlutterUnit
105 lines
2.5 KiB
Dart
105 lines
2.5 KiB
Dart
import 'package:flutter/material.dart';
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/// create by 张风捷特烈 on 2020-03-30
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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": 182,
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// "name": 'Overlay基本使用',
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// "priority": 1,
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// "subtitle":
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// " Overlay.of(context).insert插入全局组件",
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// }
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class CustomOverlay extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return Wrap(
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children: <Widget>[
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Container(
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height: 50,
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child: RawMaterialButton(
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elevation: 2,
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shape: CircleBorder(
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side: BorderSide(width: 2.0, color: Color(0xFFFFDFDFDF)),
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),
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fillColor: Colors.blue,
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splashColor: Colors.orange,
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textStyle: TextStyle(color: Colors.white),
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child: Icon(Icons.add),
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onPressed: ()=>showFloating(context),
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),
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),
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Container(
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height: 50,
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child: RawMaterialButton(
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elevation: 2,
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shape: CircleBorder(
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side: BorderSide(width: 2.0, color: Color(0xFFFFDFDFDF)),
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),
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fillColor: Colors.red,
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splashColor: Colors.orange,
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textStyle: TextStyle(color: Colors.white),
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child: Icon(Icons.remove),
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onPressed: hideFloating,
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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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bool show = false;
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Offset offset = Offset(200, 200);
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final double radius = 60;
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var entry = OverlayEntry(
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builder: (context) => Stack(
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children: <Widget>[
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Positioned(
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left: offset.dx,
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top: offset.dy,
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child: _buildFloating(),
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),
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],
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));
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///绘制悬浮控件
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_buildFloating() => GestureDetector(
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onPanDown: (details) {
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offset = details.globalPosition - Offset(radius / 2, radius / 2);
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entry.markNeedsBuild();
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},
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onPanUpdate: (DragUpdateDetails details) {
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offset = offset + details.delta;
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entry.markNeedsBuild();
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},
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onLongPress: hideFloating,
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child: Material(
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color: Colors.transparent,
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child: Container(
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height: radius,
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width: radius,
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alignment: Alignment.center,
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decoration: BoxDecoration(
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shape: BoxShape.circle,
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image: DecorationImage(
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image: AssetImage('assets/images/icon_head.webp')),
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),
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),
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));
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showFloating(BuildContext context) {
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if (!show) {
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Overlay.of(context).insert(entry);
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show = true;
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}
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}
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hideFloating() {
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if (show) {
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entry.remove();
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show = false;
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}
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}
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