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previewdialog.h Example File
painting/fontsampler/previewdialog.h

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 #ifndef PREVIEWDIALOG_H
 #define PREVIEWDIALOG_H

 #include <QDialog>
 #include <QPrinter>
 #include <QList>
 #include <QStringList>
 #include "ui_previewdialogbase.h"
 #include "previewlabel.h"

 class QTreeWidgetItem;

 typedef QList<QTreeWidgetItem *> StyleItems;

 Q_DECLARE_METATYPE(StyleItems);

 class PreviewDialog : public QDialog, private Ui::PreviewDialogBase
 {
     Q_OBJECT

 public:
     PreviewDialog(QPrinter &printer, QWidget *parent);
     enum { SmallPreviewLength = 200, LargePreviewLength = 400 };

     bool isSelected(int index);

 signals:
     void pageRequested(int index, QPainter &painter, QPrinter &printer);

 protected:
     void resizeEvent(QResizeEvent *);

 public slots:
     void accept();
     void addPage();
     void on_pageList_currentItemChanged();
     void on_paperSizeCombo_activated(int index);
     void on_paperOrientationCombo_activated(int index);
     void reject();
     void setNumberOfPages(int count);

 private:
     void paintItem(QTreeWidgetItem *item, int index);
     void paintPreview(QPixmap &pixmap, int index);
     void setupComboBoxes();

     PreviewLabel *previewLabel;
     QPrinter &printer;
     bool canceled;
     int currentPage;
     int pageCount;
 };

 #endif


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Qt 4.3.5