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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