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February 14, 2024 10:35
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| /// Provides a functionality for capture the widget as image. | |
| class WidgetToImage { | |
| WidgetToImage._(); | |
| /// Captures the widget. | |
| /// | |
| /// The [pixelRatio] describes the scale between the logical pixels and the | |
| /// size of the output image. It is independent of the | |
| /// [dart:ui.FlutterView.devicePixelRatio] for the device, so specifying 1.0 | |
| /// (the default) will give you a 1:1 mapping between logical pixels and the | |
| /// output pixels in the image. | |
| static Future<Uint8List> capture( | |
| Widget widget, { | |
| BuildContext? context, | |
| double pixelRatio = 1.0, | |
| Duration buildDelay = Duration.zero, | |
| /// Converts the [Image] object into a byte array. | |
| /// | |
| /// The [format] argument specifies the format in which the bytes will be | |
| /// returned. | |
| ui.ImageByteFormat format = ui.ImageByteFormat.png, | |
| }) async { | |
| final flutterView = context != null | |
| ? View.of(context) | |
| : PlatformDispatcher.instance.views.first; | |
| final logicalSize = flutterView.physicalSize / flutterView.devicePixelRatio; | |
| final widgetSize = flutterView.physicalSize; | |
| assert(logicalSize.aspectRatio == widgetSize.aspectRatio); | |
| final renderRepaintBoundary = RenderRepaintBoundary(); | |
| final renderView = RenderView( | |
| view: flutterView, | |
| child: RenderPositionedBox( | |
| child: renderRepaintBoundary, | |
| ), | |
| configuration: ViewConfiguration( | |
| size: logicalSize, | |
| devicePixelRatio: pixelRatio, | |
| ), | |
| ); | |
| final pipelineOwner = PipelineOwner()..rootNode = renderView; | |
| renderView.prepareInitialFrame(); | |
| final buildOwner = BuildOwner( | |
| focusManager: FocusManager(), | |
| onBuildScheduled: () {}, | |
| ); | |
| final rootElement = RenderObjectToWidgetAdapter( | |
| container: renderRepaintBoundary, | |
| child: Directionality( | |
| textDirection: TextDirection.ltr, | |
| child: widget, | |
| ), | |
| ).attachToRenderTree(buildOwner); | |
| buildOwner | |
| ..buildScope(rootElement) | |
| ..finalizeTree(); | |
| pipelineOwner | |
| ..flushLayout() | |
| ..flushCompositingBits() | |
| ..flushPaint(); | |
| if (buildDelay.inMicroseconds > 0) await Future.delayed(buildDelay); | |
| final image = await renderRepaintBoundary.toImage(pixelRatio: pixelRatio); | |
| final byteData = await image.toByteData(format: format); | |
| image.dispose(); | |
| return byteData!.buffer.asUint8List(); | |
| } | |
| } |
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