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class MeasureSizeRenderObject extends RenderProxyBox {
Size oldSize;
final OnWidgetSizeChange onChange;
MeasureSizeRenderObject(this.onChange);
@override
void performLayout() {
super.performLayout();
var newSize = child.size;
if (oldSize == newSize) return;
oldSize = newSize;
WidgetsBinding.instance.addPostFrameCallback((_) {
onChange(newSize);
});
}
}
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