QTableView自定义QCombox

.h文件

// QComboBox 委托
class ComBoxDelegate final : public  QItemDelegate
{
	Q_OBJECT
public:
	ComBoxDelegate(const QStringList& items, QObject* parent = 0);
    void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const override;
	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;

signals:
	void ValueChanged(const QString& text) const;
private:
	QStringList m_items;
};

.cpp实现

ComBoxDelegate::ComBoxDelegate(const QStringList& items, QObject* parent):QItemDelegate(parent),
	m_items(items)
{

}

void ComBoxDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
	QStyleOptionViewItem viewOption(option);
	QStyle* style = viewOption.widget ? viewOption.widget->style() : QApplication::style();
    // 绘制三角形箭头
	QStyleOptionComboBox comboBoxOption;
	comboBoxOption.rect = option.rect.adjusted(option.rect.width() - 20, 0, 0, 0);
	comboBoxOption.palette = viewOption.palette;
	comboBoxOption.state = QStyle::State_Enabled | QStyle::State_Active;
	//comboBoxOption.currentText = "▼";
	//style->drawComplexControl(QStyle::CC_ComboBox, &comboBoxOption, painter, viewOption.widget);
  // 自定义三角形箭头样式
	painter->save();
	painter->setPen(Qt::black);
	painter->setBrush(Qt::black);
	QPoint arrowPoints[3] = {
		QPoint(comboBoxOption.rect.center().x() - 4, comboBoxOption.rect.center().y() - 2),
		QPoint(comboBoxOption.rect.center().x() + 4, comboBoxOption.rect.center().y() - 2),
		QPoint(comboBoxOption.rect.center().x(), comboBoxOption.rect.center().y() + 2)
	};
	painter->drawPolygon(arrowPoints, 3);
	painter->restore();

	QItemDelegate::paint(painter, viewOption, index);
}

QWidget* ComBoxDelegate::createEditor(QWidget* parent, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
	QComboBox* editor = new QComboBox(parent);
	editor->addItems(m_items);
	connect(editor, static_cast<void(QComboBox::*)(const QString&)>(&QComboBox::currentIndexChanged), [=](const QString& text) {
		emit ValueChanged(text);
	});

	return editor;
}

void ComBoxDelegate::setEditorData(QWidget* editor, const QModelIndex& index) const
{
	QString value = index.model()->data(index, Qt::DisplayRole).toString();
	QComboBox* combobox = static_cast<QComboBox*>(editor);
	combobox->setCurrentText(value);
	combobox->showPopup();
}

void ComBoxDelegate::setModelData(QWidget* editor, QAbstractItemModel* model, const QModelIndex& index) const
{
	QComboBox* comboBox = static_cast<QComboBox*>(editor);
	QString text = comboBox->currentText();
	model->setData(index, text, Qt::EditRole);
	//emit ValueChanged(text);
}

void ComBoxDelegate::updateEditorGeometry(QWidget* editor, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
	editor->setGeometry(option.rect);
}

// 调用测试
ComBoxDelegate* pCombox = new ComBoxDelegate(EventTypes, ui->tableView_commprop);
connect(pCombox, &ComBoxDelegate::ValueChanged, this, [&](const QString& text) {
SetEventItemData(ui->tableView_commprop->currentIndex(), text);
});
ui->tableView_commprop->setItemDelegateForColumn(0, pCombox);