Custom item editor is now showing up.

[TorAn]

I am trying to create a custom editor for a user datatype to show in a model-view . Here is want I have:

Custom data type btRule (class), registered with Q_DECLARE_METATYPE(btRule)

Model btRulesModel that returns btRule for editing:

QVariant btRulesModel::data(const QModelIndex& index, int role) const
{
btRule& rul = _rules[index.row()];
…
if ( (role == Qt::EditRole) && (index.column() == 1))
	{
		QVariant v;
		v.setValue(rul);
		return v;
	}
…
}

QVariant btRulesModel::data(const QModelIndex& index, int role) const
{
btRule& rul = _rules[index.row()];
…
if ( (role == Qt::EditRole) && (index.column() == 1))
	{
		QVariant v;
		v.setValue(rul);
		return v;
	}
…
}

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I have class ModelParamViewer derived from QStyledItemDelegate. In the constructor I am registering custom editor

ModelParamViewer::ModelParamViewer(QObject *parent)
		: QStyledItemDelegate(parent)
	{
		QItemEditorCreator<ParamEditor>* itemCreator =
			new QItemEditorCreator<ParamEditor>("btRules");
 
		QVariant v;
		btRule br;
		v.setValue(br);
		QItemEditorFactory *factory = new QItemEditorFactory();
		this->setItemEditorFactory(factory);  
		QItemEditorFactory* editorfactory = this->itemEditorFactory();
		editorfactory->registerEditor(v.type(), itemCreator);
	}:

ModelParamViewer::ModelParamViewer(QObject *parent)
		: QStyledItemDelegate(parent)
	{
		QItemEditorCreator<ParamEditor>* itemCreator =
			new QItemEditorCreator<ParamEditor>("btRules");

		QVariant v;
		btRule br;
		v.setValue(br);
		QItemEditorFactory *factory = new QItemEditorFactory();
		this->setItemEditorFactory(factory);  
		QItemEditorFactory* editorfactory = this->itemEditorFactory();
		editorfactory->registerEditor(v.type(), itemCreator);
	}:

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And I am showing the editor in

QWidget* ModelParamViewer::createEditor(QWidget *parent, 
	const QStyleOptionViewItem& option,
	const QModelIndex& index) const
	{
…
			ParamEditor* wdg= new ParamEditor(parent);
			//QComboBox* wdg = new QComboBox(parent);
			return wdg;
	}

QWidget* ModelParamViewer::createEditor(QWidget *parent, 
	const QStyleOptionViewItem& option,
	const QModelIndex& index) const
	{
…
			ParamEditor* wdg= new ParamEditor(parent);
			//QComboBox* wdg = new QComboBox(parent);
			return wdg;
	}

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My custome editor is:

class ParamEditor : public QWidget
	{
		Q_OBJECT
	public:
		ParamEditor  (QWidget* parent = 0) : QWidget(parent)
		{
			QString ss("QSpinBox{background-color: #ABABAB;border: 1px solid black;}");
			setStyleSheet(ss); 
			setMinimumWidth(200);
			QHBoxLayout* layout = new QHBoxLayout();
			setLayout(layout);
			QLabel* lbl = new QLabel"label 1", this);
			layout->addWidget(lbl);
		}
	};

class ParamEditor : public QWidget
	{
		Q_OBJECT
	public:
		ParamEditor  (QWidget* parent = 0) : QWidget(parent)
		{
			QString ss("QSpinBox{background-color: #ABABAB;border: 1px solid black;}");
			setStyleSheet(ss); 
			setMinimumWidth(200);
			QHBoxLayout* layout = new QHBoxLayout();
			setLayout(layout);
			QLabel* lbl = new QLabel"label 1", this);
			layout->addWidget(lbl);
		}
	};

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Question:
when I am in the edit mode the editor does not show up. However, when I am replacing editor with ComboBox – combobox shows up as the editor. I understand that ComboBox, just like QLabel, are some of the default editors for the regular datatypes. What am I doing wrong here?

[stefanadelbert]

I recently used a custom QStyledItemDelegate and custom editor (derived from QWidget). I followed the example Star Delegate pretty closely. I didn't go down the route of an EditorFactory and by the look of your example it might not be necessary either.