column_list_model.h

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#ifndef COLUMN_LIST_MODELS_H
#define COLUMN_LIST_MODELS_H
 
#include <QAbstractListModel>
#include <QSortFilterProxyModel>
#include <QStyledItemDelegate>
#include <QSortFilterProxyModel>
#include <QMimeData>

class ColumnProxyModel : public QSortFilterProxyModel
{
public:
    ColumnProxyModel(QObject *parent = Q_NULLPTR);

    void setShowDisplayedOnly(bool set);
 
protected:
    virtual bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const override;
 
private:
    bool showDisplayedOnly_;
};

class ColumnTypeDelegate : public QStyledItemDelegate
{
public:
    ColumnTypeDelegate(QObject * parent = Q_NULLPTR);

    static QString displayDesc(char display);

    static QString alignDesc(char xalign);

    QWidget * createEditor(QWidget *parent, const QStyleOptionViewItem &option,
                           const QModelIndex &index) const override;

    void setEditorData(QWidget *editor, const QModelIndex &index) const override;

    void setModelData(QWidget *editor, QAbstractItemModel *model,
                      const QModelIndex &index) const override;

    void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option,
                              const QModelIndex &index) const override;
};

class ColumnListModel : public QAbstractTableModel
{
    Q_OBJECT
 
public:
    ColumnListModel(QObject * parent = Q_NULLPTR);

    enum {
        COL_DISPLAYED,  
        COL_TITLE,      
        COL_TYPE,       
        COL_FIELDS,     
        COL_OCCURRENCE, 
        COL_DISPLAY,    
        COL_WIDTH,      
        COL_XALIGN      
    };

    enum {
        OriginalType = Qt::UserRole, 
        DisplayedState               
    };

    static bool displayEnabled(const QModelIndex &index, bool &displayStrings, bool &displayDetails);

    void saveColumns();

    void addEntry();

    void deleteEntry(int row);

    void reset();

    virtual QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;

    virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;

    virtual int rowCount(const QModelIndex &parent = QModelIndex()) const override;

    virtual int columnCount(const QModelIndex &parent = QModelIndex()) const override;

    virtual Qt::ItemFlags flags(const QModelIndex &index) const override;

    virtual QStringList mimeTypes() const override;

    virtual QMimeData *mimeData(const QModelIndexList &indexes) const override;

    virtual Qt::DropActions supportedDropActions() const override;

    virtual bool canDropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) const override;

    virtual bool dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) override;

    virtual bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) override;
 
private:
    QString headerTitle(int section) const;

    void populate();
};
 
#endif // COLUMN_LIST_MODELS_H