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mainwindow.h Example File
painting/fontsampler/mainwindow.h

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include "ui_mainwindowbase.h"

 class QTextEdit;
 class QTreeWidget;
 class QTreeWidgetItem;

 typedef QList<QTreeWidgetItem *> StyleItems;

 class MainWindow : public QMainWindow, private Ui::MainWindowBase
 {
     Q_OBJECT

 public:
     MainWindow(QWidget *parent = 0);

 public slots:
     void on_clearAction_triggered();
     void on_markAction_triggered();
     void on_printAction_triggered();
     void on_printPreviewAction_triggered();
     void on_unmarkAction_triggered();
     void printDocument(QPrinter *printer);
     void printPage(int index, QPainter *painter, QPrinter *printer);
     void showFont(QTreeWidgetItem *item);
     void updateStyles(QTreeWidgetItem *item, int column);

 private:
     QMap<QString, StyleItems> currentPageMap();
     void markUnmarkFonts(Qt::CheckState state);
     void setupFontTree();

     QList<int> sampleSizes;
     QMap<QString, StyleItems> pageMap;
     int markedCount;
 };

 #endif