yubioath-flutter/lib/widgets/file_drop_target.dart

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/*
* Copyright (C) 2022 Yubico.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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import 'package:desktop_drop/desktop_drop.dart';
import 'package:flutter/material.dart';
class FileDropTarget extends StatefulWidget {
final Widget child;
final Function(List<int> filedata) onFileDropped;
final Widget? overlay;
const FileDropTarget({
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super.key,
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required this.child,
required this.onFileDropped,
this.overlay,
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});
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@override
State<StatefulWidget> createState() => _FileDropTargetState();
}
class _FileDropTargetState extends State<FileDropTarget> {
bool _hovering = false;
Widget _buildDefaultOverlay() => Positioned.fill(
child: Container(
color: Colors.blue.withOpacity(0.4),
child: Icon(
Icons.upload_file,
size: 200,
color: Colors.black.withOpacity(0.6),
),
),
);
@override
Widget build(BuildContext context) => DropTarget(
onDragEntered: (_) {
setState(() {
_hovering = true;
});
},
onDragExited: (_) {
setState(() {
_hovering = false;
});
},
onDragDone: (details) async {
for (final file in details.files) {
widget.onFileDropped(await file.readAsBytes());
}
},
child: Stack(
alignment: Alignment.center,
children: [
widget.child,
if (_hovering) widget.overlay ?? _buildDefaultOverlay(),
],
),
);
}