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settingstree.h Example File
tools/settingseditor/settingstree.h

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 #ifndef SETTINGSTREE_H
 #define SETTINGSTREE_H

 #include <QIcon>
 #include <QTimer>
 #include <QTreeWidget>

 class QSettings;

 class SettingsTree : public QTreeWidget
 {
     Q_OBJECT

 public:
     SettingsTree(QWidget *parent = 0);

     void setSettingsObject(QSettings *settings);
     QSize sizeHint() const;

 public slots:
     void setAutoRefresh(bool autoRefresh);
     void setFallbacksEnabled(bool enabled);
     void maybeRefresh();
     void refresh();

 protected:
     bool event(QEvent *event);

 private slots:
     void updateSetting(QTreeWidgetItem *item);

 private:
     void updateChildItems(QTreeWidgetItem *parent);
     QTreeWidgetItem *createItem(const QString &text, QTreeWidgetItem *parent,
                                 int index);
     QTreeWidgetItem *childAt(QTreeWidgetItem *parent, int index);
     int childCount(QTreeWidgetItem *parent);
     int findChild(QTreeWidgetItem *parent, const QString &text, int startIndex);
     void moveItemForward(QTreeWidgetItem *parent, int oldIndex, int newIndex);

     QSettings *settings;
     QTimer refreshTimer;
     bool autoRefresh;
     QIcon groupIcon;
     QIcon keyIcon;
 };

 #endif