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zarzet
b10370e4fc
The lyrics card and the rewind slide both rendered a RepaintBoundary to a temp PNG. captureBoundaryToPngFile does that; pixel ratio, file name, frame waiting and share parameters stay with each caller.
30 lines
1.1 KiB
Dart
30 lines
1.1 KiB
Dart
import 'dart:io';
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import 'dart:ui' show ImageByteFormat;
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import 'package:flutter/rendering.dart' show RenderRepaintBoundary;
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import 'package:flutter/widgets.dart';
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import 'package:path_provider/path_provider.dart';
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/// Renders the [RepaintBoundary] behind [boundaryKey] to a PNG named
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/// [fileName] in the temporary directory.
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///
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/// Returns null when the boundary is not laid out or the image cannot be
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/// encoded, so each caller decides how to report that.
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Future<File?> captureBoundaryToPngFile(
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GlobalKey boundaryKey, {
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required double pixelRatio,
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required String fileName,
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}) async {
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final boundary =
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boundaryKey.currentContext?.findRenderObject() as RenderRepaintBoundary?;
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if (boundary == null) return null;
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final image = await boundary.toImage(pixelRatio: pixelRatio);
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final bytes = await image.toByteData(format: ImageByteFormat.png);
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image.dispose();
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if (bytes == null) return null;
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final directory = await getTemporaryDirectory();
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final file = File('${directory.path}/$fileName');
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await file.writeAsBytes(bytes.buffer.asUint8List(), flush: true);
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return file;
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}
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