datachange

[giugio]

hello.
I have access to a model in a custom delegate.
I tryed to change some values in this model but when I read data from the model the data are always the same.
I tryed to emit dataChange, but nothing.

this is the code

bool CustomItemDelegate::editorEvent(QEvent *event, 
    QAbstractItemModel *model, 
    const QStyleOptionViewItem &option, 
    const QModelIndex &index)
{
	const QSortFilterProxyModel* modelx = 
	   static_cast<const QSortFilterProxyModel*>(index.model());
 
	QDesignerWidgetBoxInterface::Widget widget =((WidgetBoxCategoryModel*)modelx->sourceModel())->widgetAt(index);
	((WidgetBoxCategoryModel*)modelx->sourceModel())->refresh();
 
	m_strName = widget.name();
	QRect buttonRect( option.rect);
    buttonRect.setWidth( 30);
 
 
	if(widget.getFunction() == QDesignerWidgetBoxInterface::Widget::Creator)
	{
		if( event->type() == QEvent::MouseButtonPress){
		}
		else if( event->type() == QEvent::MouseButtonRelease) {
 
			if(m_pPrecedentPressedState != NULL && m_pPrecedentPressedState != &m_pressedState)
			    *m_pPrecedentPressedState = QStyle::State_Raised;
 
				widget.setName("luigi");//CHANGE THE MODEL !!!!!!!
 
			m_pressedState = *widget.getState();		
			if(m_pressedState == QStyle::State_Sunken )
				m_pressedState = QStyle::State_Raised ;
			else
			{	m_pressedState = QStyle::State_Sunken;
			}
			m_pPrecedentPressedState = &m_pressedState;
			m_strPressedName = widget.name();
		}
	}
 
    if( event->type() == QEvent::MouseButtonRelease) {
 
		emit buttonClicked( index);
		emit pressDel(m_strName);	
	}    
	((WidgetBoxCategoryModel*)modelx->sourceModel())->ChangeData();
	return true;
 
}

bool CustomItemDelegate::editorEvent(QEvent *event, 
    QAbstractItemModel *model, 
    const QStyleOptionViewItem &option, 
    const QModelIndex &index)
{
	const QSortFilterProxyModel* modelx = 
	   static_cast<const QSortFilterProxyModel*>(index.model());
   
	QDesignerWidgetBoxInterface::Widget widget =((WidgetBoxCategoryModel*)modelx->sourceModel())->widgetAt(index);
	((WidgetBoxCategoryModel*)modelx->sourceModel())->refresh();
	
	m_strName = widget.name();
	QRect buttonRect( option.rect);
    buttonRect.setWidth( 30);
    
	
	if(widget.getFunction() == QDesignerWidgetBoxInterface::Widget::Creator)
	{
		if( event->type() == QEvent::MouseButtonPress){
		}
		else if( event->type() == QEvent::MouseButtonRelease) {
			
			if(m_pPrecedentPressedState != NULL && m_pPrecedentPressedState != &m_pressedState)
			    *m_pPrecedentPressedState = QStyle::State_Raised;

				widget.setName("luigi");//CHANGE THE MODEL !!!!!!!
			
			m_pressedState = *widget.getState();		
			if(m_pressedState == QStyle::State_Sunken )
				m_pressedState = QStyle::State_Raised ;
			else
			{	m_pressedState = QStyle::State_Sunken;
			}
			m_pPrecedentPressedState = &m_pressedState;
			m_strPressedName = widget.name();
		}
	}
	
    if( event->type() == QEvent::MouseButtonRelease) {
       
		emit buttonClicked( index);
		emit pressDel(m_strName);	
	}    
	((WidgetBoxCategoryModel*)modelx->sourceModel())->ChangeData();
	return true;

}

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((WidgetBoxCategoryModel*)modelx->sourceModel())->ChangeData();
WidgetBoxCategoryModel is a custom model with into this function:

void WidgetBoxCategoryModel::ChangeData()
{
 
	dataChanged(index(0,0),index(2,2));
	emit dataChanged(index(0,0),index(2,2));
}

void WidgetBoxCategoryModel::ChangeData()
{
	
	dataChanged(index(0,0),index(2,2));
	emit dataChanged(index(0,0),index(2,2));
}

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[amleto]

too many possibilities.

Maybe your 'change the model' is never hit. Maybe your model isn't correct.

maybe the fact that this line

QDesignerWidgetBoxInterface::Widget widget =((WidgetBoxCategoryModel*)modelx->sourceModel())->widgetAt(index);
//                            widget is *new* object on the stack                          widgetAt returns by value? by reference?

QDesignerWidgetBoxInterface::Widget widget =((WidgetBoxCategoryModel*)modelx->sourceModel())->widgetAt(index);
//                            widget is *new* object on the stack                          widgetAt returns by value? by reference?

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makes a COPY is important.

Who is to know?

[ChrisW67]

I think Amleto's copy hypotheses is good.

As an aside, all those unsafe casts make my eyes hurt, and they will eventually make you hurt too.
Line 7 should be a qobject_cast<>() followed immediately by a check for success.
You should qobject_cast<>() the source model to WidgetBoxCategoryModel* once only and also follow that with a check for success.

[wysota]

I don't think a custom delegate should really ever access QDesignerWidgetBoxInterface which is only present when you're implementing a custom plugin for Qt Designer. Unless of course your custom delegate is only used within the Designer plugin.