How to centering the checkbox in qtableview

[nemesisqp]

hello, I want to draw a checkbox centered in the cell so I tried to subclass QStyledItemDelegate to draw the checkbox but it showed but won't centered and I tried to calculate QStyleOptionButton 's rect manually and it seem not the right way do to, so what is the right way to align item ? and one more problem I can't find a way to custom draw the header of qtableview , please help.

void TestDelegate::paint(QPainter *painter,
						  const QStyleOptionViewItem &option,
						  const QModelIndex &index) const
{
	if (index.column() == 1) 
	{
		bool data = index.model()->data(index, Qt::DisplayRole).toBool();
		QStyleOptionButton checkboxstyle;
		checkboxstyle.rect = option.rect;
		int width = checkboxstyle.rect.width();
		checkboxstyle.rect.setLeft(checkboxstyle.rect.x()+width/2);
		if(data)
			checkboxstyle.state = QStyle::State_On|QStyle::State_Enabled;
		else
			checkboxstyle.state = QStyle::State_Off|QStyle::State_Enabled;
		QApplication::style()->drawControl(QStyle::CE_CheckBox,	&checkboxstyle, painter);
	} 
	else
	{
		QStyledItemDelegate::paint(painter, option, index);
	}
}

void TestDelegate::paint(QPainter *painter,
						  const QStyleOptionViewItem &option,
						  const QModelIndex &index) const
{
	if (index.column() == 1) 
	{
		bool data = index.model()->data(index, Qt::DisplayRole).toBool();
		QStyleOptionButton checkboxstyle;
		checkboxstyle.rect = option.rect;
		int width = checkboxstyle.rect.width();
		checkboxstyle.rect.setLeft(checkboxstyle.rect.x()+width/2);
		if(data)
			checkboxstyle.state = QStyle::State_On|QStyle::State_Enabled;
		else
			checkboxstyle.state = QStyle::State_Off|QStyle::State_Enabled;
		QApplication::style()->drawControl(QStyle::CE_CheckBox,	&checkboxstyle, painter);
	} 
	else
	{
		QStyledItemDelegate::paint(painter, option, index);
	}
}

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[nemesisqp]

I just got it done, hope this will work in general case

void TestDelegate::paint(QPainter *painter,
						  const QStyleOptionViewItem &option,
						  const QModelIndex &index) const
{
	if (index.column() == 1) 
	{
		bool data = index.model()->data(index, Qt::DisplayRole).toBool();
		QStyleOptionButton checkboxstyle;
		QRect checkbox_rect = QApplication::style()->subElementRect(QStyle::SE_CheckBoxIndicator, &checkboxstyle);
		checkboxstyle.rect = option.rect;
		checkboxstyle.rect.setLeft(option.rect.x() + 
			option.rect.width()/2 - checkbox_rect.width()/2);
		if(data)
			checkboxstyle.state = QStyle::State_On|QStyle::State_Enabled;
		else
			checkboxstyle.state = QStyle::State_Off|QStyle::State_Enabled;
 
		QApplication::style()->drawControl(QStyle::CE_CheckBox, &checkboxstyle, painter);
	} 
	else
	{
		QStyledItemDelegate::paint(painter, option, index);
	}
}

void TestDelegate::paint(QPainter *painter,
						  const QStyleOptionViewItem &option,
						  const QModelIndex &index) const
{
	if (index.column() == 1) 
	{
		bool data = index.model()->data(index, Qt::DisplayRole).toBool();
		QStyleOptionButton checkboxstyle;
		QRect checkbox_rect = QApplication::style()->subElementRect(QStyle::SE_CheckBoxIndicator, &checkboxstyle);
		checkboxstyle.rect = option.rect;
		checkboxstyle.rect.setLeft(option.rect.x() + 
			option.rect.width()/2 - checkbox_rect.width()/2);
		if(data)
			checkboxstyle.state = QStyle::State_On|QStyle::State_Enabled;
		else
			checkboxstyle.state = QStyle::State_Off|QStyle::State_Enabled;
		
		QApplication::style()->drawControl(QStyle::CE_CheckBox, &checkboxstyle, painter);
	} 
	else
	{
		QStyledItemDelegate::paint(painter, option, index);
	}
}

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