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printpreview.h Example File
demos/textedit/printpreview.h

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 #ifndef PRINTPREVIEW_H
 #define PRINTPREVIEW_H

 #include <QMainWindow>
 #include <QPrinter>
 #include <QPointF>
 #include <QSizeF>

 class PreviewView;
 class QTextDocument;

 class PrintPreview : public QMainWindow
 {
     Q_OBJECT
 public:
     PrintPreview(const QTextDocument *document, QWidget *parent);
     virtual ~PrintPreview();

     QSizeF paperSize;
     QPointF pageTopLeft;

 private slots:
     void print();
     void pageSetup();

 private:
     void setup();

     QTextDocument *doc;
     PreviewView *view;
     QPrinter printer;
 };

 #endif // PRINTPREVIEW_H