Infinite loop - resize parent from child

[bitChanger]

For this project i'm using Windows and Qt 4.1.2

I have a QMainWindow that contains a widget that occupies the entire window. When the resizeEvent of the child widget is called I want the child to maintain proportions. After fixing the width/height proportions of the child I need to resize the parent.

I've included a complete program that demonstrates the issue.

Here is the wrong solution, but what would be a good workaround for it?

void MyWidget::resizeEvent(QResizeEvent* event)
{
  QSize newsz = event->size();
 
  _figureHeight = newsz.width()*_figureHeight/_figureWidth;
  _figureWidth = newsz.width();
 
  parentWidget()->resize(_figureWidth, _figureHeight);
}

void MyWidget::resizeEvent(QResizeEvent* event)
{
  QSize newsz = event->size();

  _figureHeight = newsz.width()*_figureHeight/_figureWidth;
  _figureWidth = newsz.width();

  parentWidget()->resize(_figureWidth, _figureHeight);
}

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