How can I make the cursor flash?

[cslijy]

I paint a cursor in my textedit ,but it not flash,how can i make the cursor flash?

void MYTextEdit:: paintEvent(QPaintEvent *event)
{
	QPainter p(viewport());
	QTextLayout textLayout(document()->toPlainText());
	QPointF t(100,100);
 
	int leading = fm.leading();
	int height = 0;
	qreal widthUsed = 0;
	textLayout.beginLayout();
	while (1) {
		QTextLine line = textLayout.createLine();
		if (!line.isValid())
		break;
 
		line.setLineWidth(200);
		height += leading;
		line.setPosition(QPoint(0, height));
		height += (int) line.height();
		widthUsed = qMax(widthUsed, line.naturalTextWidth());
		textLayout.drawCursor(&p,t,2,3);
		}
}

void MYTextEdit:: paintEvent(QPaintEvent *event)
{
	QPainter p(viewport());
	QTextLayout textLayout(document()->toPlainText());
	QPointF t(100,100);

	int leading = fm.leading();
	int height = 0;
	qreal widthUsed = 0;
	textLayout.beginLayout();
	while (1) {
		QTextLine line = textLayout.createLine();
		if (!line.isValid())
		break;

		line.setLineWidth(200);
		height += leading;
		line.setPosition(QPoint(0, height));
		height += (int) line.height();
		widthUsed = qMax(widthUsed, line.naturalTextWidth());
		textLayout.drawCursor(&p,t,2,3);
		}
}

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