Vera-Spoettl
commented
5 months ago I gave it a try today.
I added a widget for "wrapping" unsupported flutter widgets, that I want to capture and printed:
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
class CaptureWrapper extends StatelessWidget {
final Widget child;
const CaptureWrapper({
super.key,
required this.child,
});
@override
Widget build(BuildContext context) {
return RepaintBoundary(
child: child,
);
}
}
I expanded export_instance.dart with this case:
case CaptureWrapper:
if (context != null) {
if (widget.key == null) {
throw Exception('Capture must have a key to be exported');
}
Element? contextElement =
findElement(context, (CaptureWrapper e) => e.key == widget.key);
assert(contextElement != null);
RenderRepaintBoundary? boundary;
RenderObject? renderObject = contextElement!.renderObject;
if (renderObject is RenderRepaintBoundary) {
boundary = renderObject;
} else {
renderObject?.visitChildren((child) {
if (child is RenderRepaintBoundary) {
boundary = child;
}
});
}
assert(boundary != null);
final ui.Image uiImage = await boundary!.toImage(pixelRatio: 2.0);
final pngBytes =
await uiImage.toByteData(format: ImageByteFormat.png);
return [
await Image.memory(Uint8List.view(pngBytes!.buffer)).toPdfWidget()
];
}
return [];
Up to now, it seems to work with fl_chart and CustomPainter widgets.
Unfortunately I'm not experienced enough in flutter to know if this is an elegant, efficient, ... solution. But I'm open to discussions. :-)
joseph-grabinger
Great package! Unfortunately, I have to use quite some "unsupported" widgets like charts from fl_chart, diagrams painted via custom_painter, ... . I'm wondering, if it would be possible (and with normal effort realizable) to support these widgets via screenshot and image. Have you ever spend a thought on this or do you have a better idea? Thanks, Vera