58 lines
1.8 KiB
Dart
58 lines
1.8 KiB
Dart
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import 'dart:typed_data';
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import 'dart:ui' as ui;
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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Future<Uint8List?> createImageFromWidget(BuildContext context, Widget widget, {Duration? wait, Size? logicalSize, Size? imageSize}) async {
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final repaintBoundary = RenderRepaintBoundary();
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logicalSize ??= View.of(context).physicalSize / View.of(context).devicePixelRatio;
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imageSize ??= View.of(context).physicalSize;
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assert(logicalSize.aspectRatio == imageSize.aspectRatio, 'logicalSize and imageSize must not be the same');
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final renderView = RenderView(
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child: RenderPositionedBox(alignment: Alignment.center, child: repaintBoundary),
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configuration: ViewConfiguration(
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physicalConstraints: BoxConstraints.tight(logicalSize),
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logicalConstraints: BoxConstraints.tight(logicalSize),
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devicePixelRatio: 1,
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),
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view: View.of(context) //PlatformDispatcher.instance.views.first,
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);
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final pipelineOwner = PipelineOwner();
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final buildOwner = BuildOwner(focusManager: FocusManager());
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pipelineOwner.rootNode = renderView;
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renderView.prepareInitialFrame();
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final rootElement = RenderObjectToWidgetAdapter<RenderBox>(
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container: repaintBoundary,
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child: Directionality(
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textDirection: TextDirection.ltr,
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child: widget,
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)).attachToRenderTree(buildOwner);
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buildOwner.buildScope(rootElement);
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if (wait != null) {
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await Future.delayed(wait);
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}
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buildOwner
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..buildScope(rootElement)
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..finalizeTree();
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pipelineOwner
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..flushLayout()
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..flushCompositingBits()
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..flushPaint();
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final image = await repaintBoundary.toImage(pixelRatio: imageSize.width / logicalSize.width);
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final byteData = await image.toByteData(format: ui.ImageByteFormat.png);
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return byteData?.buffer.asUint8List();
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}
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