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mainwindow.h Example File
tools/treemodelcompleter/mainwindow.h

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QMainWindow>
 #include <QModelIndex>

 class TreeModelCompleter;
 class QAbstractItemModel;
 class QComboBox;
 class QLabel;
 class QLineEdit;
 class QProgressBar;
 class QCheckBox;
 class QTreeView;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow(QWidget *parent = 0);

 private slots:
     void about();
     void changeCase(int);
     void changeMode(int);
     void highlight(const QModelIndex&);
     void updateContentsLabel(const QString&);

 private:
     void createMenu();
     QAbstractItemModel *modelFromFile(const QString& fileName);

     QTreeView *treeView;
     QComboBox *caseCombo;
     QComboBox *modeCombo;
     QLabel *contentsLabel;
     TreeModelCompleter *completer;
     QLineEdit *lineEdit;
 };

 #endif // MAINWINDOW_H