53 lines
1.3 KiB
Dart
53 lines
1.3 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:flutter/scheduler.dart';
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class MeasurableWidget extends StatefulWidget {
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final Widget child;
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Function? triggerMeasure;
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final Function(Size? size, Offset? position) onChange;
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MeasurableWidget({super.key, required this.onChange, required this.child});
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@override
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_WidgetSizeState createState() => _WidgetSizeState();
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}
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class _WidgetSizeState extends State<MeasurableWidget> {
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var widgetKey = GlobalKey();
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Offset? oldPosition;
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@override
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void initState() {
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// TODO: implement initState
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super.initState();
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}
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void postFrameCallback(_) {
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final context = widgetKey.currentContext;
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if (context == null) return;
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final newSize = context.size;
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final RenderBox? box =
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widgetKey.currentContext?.findRenderObject() as RenderBox?;
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final Offset? position = box?.localToGlobal(Offset.zero);
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if (oldPosition != null) {
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if (oldPosition!.dx == position!.dx && oldPosition!.dy == position.dy) {
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return;
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}
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}
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oldPosition = position;
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widget.onChange(newSize, position);
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}
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@override
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Widget build(BuildContext context) {
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SchedulerBinding.instance.addPostFrameCallback(postFrameCallback);
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return Container(
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key: widgetKey,
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child: widget.child,
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);
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}
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}
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