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    QTextEdit *cTextEdit;
    QPrintPreviewDialog *prDialog;

t_printForm::t_printForm(QObject *parent) :
    QWidget(parent)
{
...
    cTextEdit = new QTextEdit();
...
    QPushButton *doPreviewAndPrint= new QPushButton();
    doPreviewAndPrint->setText("Препросмотр\n и печать");
    QObject::connect(doPreviewAndPrint,SIGNAL(clicked()),this,SLOT(printPreview()));
...
    prDialog = new QPrintPreviewDialog(new QPrinter(QPrinter::HighResolution));
    connect(prDialog,SIGNAL(paintRequested(QPrinter*)),this,SLOT(printPreviewNeeds(QPrinter*)));
...
}

...
//--------------------------------------------------------------------------
//[SLOT]
void t_printForm::printPreview()//запустить окно предварительной печати
{
    prDialog->exec();
}

...
//--------------------------------------------------------------------------
//[SLOT]
void t_printForm::printPreviewNeeds(QPrinter *_printer)
{
    cTextEdit->print(_printer);
}