I've created a custom QStyledItemDelegate which uses a custom QWidget for an editor.

When the editor widget is created it's not being painted in the cell that's being edited. It's painted as a separate dialog window.

The editor should contain a QSpinBox and a QToolButton.

Here are my delegate and editor classes:

Delegate

Qt Code: 
  1. class CQuantityItemDelegate : public QStyledItemDelegate
  2. {
  3.     Q_OBJECT
  4.  
  5. public:
  6.     CQuantityItemDelegate(QWidget *parent = 0) : QStyledItemDelegate(parent) {}
  7.  
  8.     void paint(QPainter *painter, const QStyleOptionViewItem &option,
  9.         const QModelIndex &index) const;
  10.     QSize sizeHint(const QStyleOptionViewItem &option,
  11.         const QModelIndex &index) const;
  12.     QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
  13.         const QModelIndex &index) const;
  14.     void setEditorData(QWidget *editor, const QModelIndex &index) const;
  15.     void setModelData(QWidget *editor, QAbstractItemModel *model,
  16.         const QModelIndex &index) const;
  17.  
  18. private slots:
  19.     void commitAndCloseEditor();
  20. };
  21.  
  22. void
  23. CQuantityItemDelegate::paint(
  24.     QPainter* painter,
  25.     const QStyleOptionViewItem& option,
  26.     const QModelIndex& index) const
  27. {
  28.     QStyledItemDelegate::paint(painter, option, index);
  29. }
  30.  
  32. CQuantityItemDelegate::sizeHint(
  33.     const QStyleOptionViewItem& option,
  34.     const QModelIndex& index) const
  35. {
  36.     return QStyledItemDelegate::sizeHint(option, index);
  37. }
  38.  
  40. CQuantityItemDelegate::createEditor(
  41.     QWidget* parent,
  42.     const QStyleOptionViewItem& option,
  43.     const QModelIndex& index) const
  44. {
  45.     CQuantityEditor* editor = new CQuantityEditor(parent);
  46.     connect(editor, SIGNAL(editingFinished()),
  47.         this, SLOT(commitAndCloseEditor()));
  48.     return editor;
  49. }
  50.  
  51. void
  52. CQuantityItemDelegate::setEditorData(
  53.     QWidget* editor,
  54.     const QModelIndex& index) const
  55. {
  56.     int value = index.model()->data(index, Qt::EditRole).toInt();
  57.     CQuantityEditor* quantityEditor = static_cast<CQuantityEditor*>(editor);
  58.     quantityEditor->SetQuantity(value);
  59. }
  60.  
  61. void
  62. CQuantityItemDelegate::setModelData(
  63.     QWidget* editor,
  65.     const QModelIndex& index) const
  66. {
  67.     QStyledItemDelegate::setModelData(editor, model, index);
  68. }
  69.  
  70. void
  71. CQuantityItemDelegate::commitAndCloseEditor()
  72. {
  73.     CQuantityEditor* editor = qobject_cast<CQuantityEditor*>(sender());
  74.     emit commitData(editor);
  75.     emit closeEditor(editor);
  76. }
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Editor

Qt Code: 
  1. class CQuantityEditor : public QWidget
  2. {
  3.     Q_OBJECT
  4.  
  5. public:
  6.     CQuantityEditor(QWidget *parent = 0) {
  7.         quantitySpinBox = new QSpinBox(this);
  8. //         confirm = new QToolButton(parent);
  9. //         confirm->setIcon(QIcon(":/Icons/Box/Tick/green"));
  10. //         confirm->setToolButtonStyle(Qt::ToolButtonIconOnly);
  11. // 
  12. //         QHBoxLayout* hLayout = new QHBoxLayout(parent);
  13. //         hLayout->addWidget(quantitySpinBox, 1);
  14. //         hLayout->addWidget(confirm, 0);
  15. //         hLayout->setSpacing(0);
  16. //         hLayout->setMargin(0);
  17. //         setLayout(hLayout);
  18. //         
  19. //         connect(confirm, SIGNAL(released()),
  20. //             this, SIGNAL(editingFinished())
  21. //         );
  22.     }
  23.  
  24.     void SetQuantity(const int& quantity) {
  25.         quantitySpinBox->setValue(quantity);
  26.     }
  27.     int Quantity() { return quantitySpinBox->value(); }
  28.  
  29. signals:
  30.     void editingFinished();
  31.  
  32. protected:
  33.     void paintEvent(QPaintEvent* e) {
  34.         QWidget::paintEvent(e);
  35.     }
  36.  
  37. private:
  38.     QSpinBox* quantitySpinBox;
  39.     QToolButton* confirm;
  40. };
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