46 lines
932 B
Dart
46 lines
932 B
Dart
import 'package:flutter/material.dart';
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import 'package:flutter/scheduler.dart';
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class WidgetSize extends StatefulWidget {
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const WidgetSize({
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required this.onChange,
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required this.child,
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final super.key,
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});
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final Widget child;
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final Function onChange;
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@override
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State<WidgetSize> createState() => _WidgetSizeState();
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}
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class _WidgetSizeState extends State<WidgetSize> {
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@override
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Widget build(final 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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var widgetKey = GlobalKey();
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Size? oldSize;
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void postFrameCallback(_) {
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final context = widgetKey.currentContext;
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if (context == null) {
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return;
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}
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;
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final newSize = context.size;
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if (oldSize == newSize) {
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return;
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}
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oldSize = newSize;
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widget.onChange(newSize);
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}
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}
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