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  1. 30th April 2011, 23:21 #1
    mattsnowboard
    mattsnowboard is offline Beginner
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    Apr 2011
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    Question Custom QStyledItemDelegate paint function never called

    I have a custom Model, View and Delegate. I am unable to get the Delegate paint function to ever get called. It should print a debug statement, however it behaves as if I never created the delegate Here is a brief part of the code. Please let me know if there are other functions that would be useful to post. Thanks!

    Qt Code: 
    1. class QtCellItemDelegate : public QStyledItemDelegate
    2. {
    3.     Q_OBJECT;
    4. public:
    5.     QtCellItemDelegate( QWidget *parent = NULL );
    6.  
    7.     void paint( QPainter *painter,
    8.                 const QStyleOptionViewItem &option,
    9.                 const QModelIndex &index );
    10.  
    11.     QSize sizeHint( const QStyleOptionViewItem &option,
    12.                     const QModelIndex & index ) const;
    13. };
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    Qt Code: 
    1. QtCellItemDelegate::QtCellItemDelegate( QWidget *parent ) :
    2.     QStyledItemDelegate( parent )
    3. {
    4.     qDebug() << "CONSTRUCT"; // this gets printed, good!
    5. }
    6.  
    7. void QtCellItemDelegate::paint( QPainter *painter,
    8.                                 const QStyleOptionViewItem &option,
    9.                                 const QModelIndex &index )
    10. {
    11.     //painter->save();
    12.     qDebug() << "Begin Paint"; // this is never printed, function never called
    13.     QStyledItemDelegate::paint( painter, option, index );
    14.  
    15.     qDebug() << "   Begin custom paint";
    16.     // custom stuff...
    17.     qDebug() << "End paint";
    18.     //painter->restore();
    19. }
    20.  
    21. QSize QtCellItemDelegate::sizeHint( const QStyleOptionViewItem &option,
    22.                                      const QModelIndex & index ) const 
    23. {
    24.     return QSize( 60, 60 );
    25. }
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    Qt Code: 
    1. class QtDirector : public QObject
    2. {
    3.     Q_OBJECT;
    4. public:
    5.     friend class QtFactory;
    6.  
    7.     int Exec();
    8.  
    9.     ~QtDirector() {}
    10.  
    11. protected:
    12.  
    13.     QtDirector( int &argc, char **arg,
    14.                 std::shared_ptr<QtPuzzleModel> puzzleModel );
    15.  
    16. private:
    17.     QtGameApplication *_app;
    18.  
    19.     QTableView *_tableView;
    20.  
    21.     QtMainWindow *_window;
    22.  
    23.     std::shared_ptr<QtPuzzleModel> _model;
    24.     std::shared_ptr<QtCellItemDelegate> _delegate;
    25. };
    26.  
    27. QtDirector::QtDirector( int &argc, char **argv,
    28.                         std::shared_ptr<QtPuzzleModel> puzzleModel )
    29.     : _app( new QtGameApplication( argc, argv ) ),
    30.       _tableView( new QtPuzzleView ),
    31.       _window( new QtMainWindow( _tableView ) ),
    32.       _model( puzzleModel ),
    33.       _delegate( new QtCellItemDelegate( _tableView ) )
    34. {
    35.     if ( !_model )
    36.     {
    37.         throw std::runtime_error(
    38.             "Cannot instantiate with NULL QtPuzzleModel" );
    39.     }
    40.     _tableView->setModel( _model.get() );
    41.     _tableView->setItemDelegate( _delegate.get() );
    42.  
    43.     qDebug() << "My delegate is: " << _delegate.get(); // output of this
    44.     qDebug() << "Table view is using: " << _tableView->itemDelegate(); // and this is the same
    45.  
    46.     connect( _window->GetLoadAction(), SIGNAL( triggered() ),
    47.              _model.get(), SLOT( LoadPuzzle() ) );
    48.     connect( _window->GetNewAction(), SIGNAL( triggered() ),
    49.              _model.get(), SLOT( NewPuzzle() ) );
    50.     connect( _window->GetUndoAction(), SIGNAL( triggered() ),
    51.              _model.get(), SLOT( Undo() ) );
    52.     connect( _window->GetRedoAction(), SIGNAL( triggered() ),
    53.              _model.get(), SLOT( Redo() ) );
    54.     connect( _window->GetMarkHintsAction(), SIGNAL( triggered() ),
    55.              _model.get(), SLOT( MarkPuzzleHints() ) );
    56.  
    57.     connect( _model.get(), SIGNAL( hasPuzzle(bool) ),
    58.              _window->GetMarkHintsAction(), SLOT( setEnabled( bool ) ) );
    59.  
    60.     connect( this, SIGNAL( canUndo( bool ) ),
    61.              _window->GetUndoAction(), SLOT( setEnabled( bool ) ) );
    62.  
    63.     connect( this, SIGNAL( canRedo( bool ) ),
    64.              _window->GetRedoAction(), SLOT( setEnabled( bool ) ) );
    65.  
    66.     _window->setWindowTitle(
    67.         QApplication::translate("windowlayout", "Sudoku"));
    68.     _window->show();
    69. }
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    Qt Code: 
    1. class QtPuzzleModel : public QAbstractTableModel, public Sudoku::ICellObserver
    2. {
    3.     Q_OBJECT;
    4. public:
    5. //    typedef std::map<Sudoku::Position, int > CellModelMap;
    6.  
    7.     QtPuzzleModel( QObject *parent,
    8.                    std::shared_ptr<Sudoku::IPuzzleAccess> access,
    9.                    std::shared_ptr<Sudoku::GameController> gameController,
    10.                    std::shared_ptr<Sudoku::PuzzleController> puzzleController,
    11.                    std::shared_ptr<Sudoku::CellController> cellController );
    12.     int rowCount( const QModelIndex &parent = QModelIndex() ) const;
    13.     int columnCount( const QModelIndex &parent = QModelIndex() ) const;
    14.     // read data
    15.     QVariant data( const QModelIndex &index, int role = Qt::DisplayRole ) const;
    16.     // edit data
    17.     bool setData( const QModelIndex & index,
    18.                   const QVariant & value,
    19.                   int role = Qt::EditRole );
    20.     Qt::ItemFlags flags( const QModelIndex & index ) const;
    21.  
    22.     // disable some stuff
    23.     QVariant headerData( int section,
    24.                          Qt::Orientation orientation,
    25.                          int role ) const;
    26.  
    27.     void Update( const Sudoku::Cell &c );
    28.  
    29. public slots:
    30.     void NewPuzzle();
    31.     bool LoadPuzzle();
    32.     void MarkPuzzleHints();
    33.     void Undo();
    34.     void Redo();
    35.  
    36. signals:
    37.     void ValueChanged( int x, int y, int value );
    38.     void hasPuzzle( bool yes );
    39.  
    40. private:
    41.     std::shared_ptr<Sudoku::IPuzzleAccess> _access;
    42.     std::shared_ptr<Sudoku::GameController> _gameController;
    43.     std::shared_ptr<Sudoku::PuzzleController> _puzzleController;
    44.     std::shared_ptr<Sudoku::CellController> _cellController;
    45. };
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    Qt Code: 
    1. class QtPuzzleView : public QTableView
    2. {
    3.     Q_OBJECT;
    4. public:
    5.     QtPuzzleView( QWidget *parent = NULL );
    6.  
    7.     virtual void setModel( QAbstractItemModel *model );
    8.  
    9. protected:
    10.     void resizeRows( int rowCount );
    11.     void resizeCols( int colCount );
    12.  
    13. protected slots:
    14.     void columnCountChanged( int oldCount, int newCount );
    15.     void rowCountChanged( int oldCount, int newCount );
    16. };
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    Last edited by mattsnowboard; 30th April 2011 at 23:24. Reason: changed [qtclass] to [code]
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