/** A model for displaying columns shown in a QgsComposerAttributeTable*/
class QgsComposerAttributeTableColumnModel: QAbstractTableModel
{
%TypeHeaderCode
#include <qgscomposerattributetablemodel.h>
%End

  public:

    /** Controls whether a row/column is shifted up or down
     */
    enum ShiftDirection
    {
      ShiftUp, /*!< shift the row/column up */
      ShiftDown /*!< shift the row/column down */
    };

    /** Constructor for QgsComposerAttributeTableColumnModel.
     * @param composerTable QgsComposerAttributeTable the model is attached to
     * @param parent optional parent
     */
    QgsComposerAttributeTableColumnModel( QgsComposerAttributeTable *composerTable, QObject *parent /TransferThis/ = 0 );
    virtual ~QgsComposerAttributeTableColumnModel();

    virtual int rowCount( const QModelIndex &parent = QModelIndex() ) const;
    int columnCount( const QModelIndex &parent = QModelIndex() ) const;
    virtual QVariant data( const QModelIndex &index, int role ) const;
    QVariant headerData( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const;
    virtual bool setData( const QModelIndex &index, const QVariant &value, int role = Qt::EditRole );
    Qt::ItemFlags flags( const QModelIndex &index ) const;
    bool removeRows( int row, int count, const QModelIndex &parent = QModelIndex() );
    bool insertRows( int row, int count, const QModelIndex &parent = QModelIndex() );
    QModelIndex index( int row, int column, const QModelIndex &parent ) const;
    QModelIndex parent( const QModelIndex &child ) const;

    /** Moves the specified row up or down in the model. Used for rearranging the attribute tables
     * columns.
     * @returns true if the move is allowed
     * @param row row in model representing attribute table column to move
     * @param direction direction to move the attribute table column
     * @note added in 2.3
     */
    bool moveRow( int row, ShiftDirection direction );

    /** Resets the attribute table's columns to match the source layer's fields. Remove all existing
     * attribute table columns and column customisations.
     * @note added in 2.3
     */
    void resetToLayer();

    /** Returns the QgsComposerTableColumn corresponding to an index in the model.
     * @returns QgsComposerTableColumn for specified index
     * @param index a QModelIndex
     * @note added in 2.3
     * @see indexFromColumn
     */
    QgsComposerTableColumn* columnFromIndex( const QModelIndex & index ) const;

    /** Returns a QModelIndex corresponding to a QgsComposerTableColumn in the model.
     * @returns QModelIndex for specified QgsComposerTableColumn
     * @param column a QgsComposerTableColumn
     * @note added in 2.3
     * @see columnFromIndex
     */
    QModelIndex indexFromColumn( QgsComposerTableColumn *column );

    /** Sets a specified column as a sorted column in the QgsComposerAttributeTable. The column will be
     * added to the end of the sort rank list, ie it will take the next largest available sort rank.
     * @param column a QgsComposerTableColumn
     * @param order sort order for column
     * @note added in 2.3
     * @see removeColumnFromSort
     * @see moveColumnInSortRank
     */
    void setColumnAsSorted( QgsComposerTableColumn *column, Qt::SortOrder order );

    /** Sets a specified column as an unsorted column in the QgsComposerAttributeTable. The column will be
     * removed from the sort rank list.
     * @param column a QgsComposerTableColumn
     * @note added in 2.3
     * @see setColumnAsSorted
     */
    void setColumnAsUnsorted( QgsComposerTableColumn * column );

    /** Moves a column up or down in the sort rank for the QgsComposerAttributeTable.
     * @param column a QgsComposerTableColumn
     * @param direction direction to move the column in the sort rank list
     * @note added in 2.3
     * @see setColumnAsSorted
     */
    bool moveColumnInSortRank( QgsComposerTableColumn * column, ShiftDirection direction );

};

/** Allows for filtering QgsComposerAttributeTable columns by columns which are sorted or unsorted*/
class QgsComposerTableSortColumnsProxyModel : QSortFilterProxyModel
{
%TypeHeaderCode
#include <qgscomposerattributetablemodel.h>
%End

  public:

    /** Controls whether the proxy model shows sorted or unsorted columns
     */
    enum ColumnFilterType
    {
      ShowSortedColumns, /*!< show only sorted columns */
      ShowUnsortedColumns/*!< show only unsorted columns */
    };

    /** Constructor for QgsComposerTableSortColumnsProxyModel.
     * @param composerTable QgsComposerAttributeTable the model is attached to
     * @param filterType filter for columns, controls whether sorted or unsorted columns are shown
     * @param parent optional parent
     */
    QgsComposerTableSortColumnsProxyModel( QgsComposerAttributeTable *composerTable, ColumnFilterType filterType, QObject *parent /TransferThis/ = 0 );

    virtual ~QgsComposerTableSortColumnsProxyModel();

    bool lessThan( const QModelIndex &left, const QModelIndex &right ) const;
    int columnCount( const QModelIndex &parent = QModelIndex() ) const;
    virtual QVariant data( const QModelIndex &index, int role ) const;
    QVariant headerData( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const;
    Qt::ItemFlags flags( const QModelIndex &index ) const;
    virtual bool setData( const QModelIndex &index, const QVariant &value, int role = Qt::EditRole );

    /** Returns the QgsComposerTableColumn corresponding to a row in the proxy model.
     * @returns QgsComposerTableColumn for specified row
     * @param row a row number
     * @note added in 2.3
     * @see columnFromIndex
     */
    QgsComposerTableColumn* columnFromRow( int row );

    /** Returns the QgsComposerTableColumn corresponding to an index in the proxy model.
     * @returns QgsComposerTableColumn for specified index
     * @param index a QModelIndex
     * @note added in 2.3
     * @see columnFromRow
     * @see columnFromSourceIndex
     */
    QgsComposerTableColumn* columnFromIndex( const QModelIndex & index ) const;


    /** Returns the QgsComposerTableColumn corresponding to an index from the source
     * QgsComposerAttributeTableColumnModel model.
     * @returns QgsComposerTableColumn for specified index from QgsComposerAttributeTableColumnModel
     * @param sourceIndex a QModelIndex
     * @note added in 2.3
     * @see columnFromRow
     * @see columnFromIndex
     */
    QgsComposerTableColumn* columnFromSourceIndex( const QModelIndex& sourceIndex ) const;

    /** Invalidates the current filter used by the proxy model
     * @note added in 2.3
     */
    void resetFilter();

  protected:
    bool filterAcceptsRow( int source_row, const QModelIndex & source_parent ) const;

};