expand a treeWidget

[mattia]

Hello, i have a problem with treeWidget.
I'd like to create a treeWidget and i want that all the treeWidget nodes areexpanded.
I have tried with this code, but it doesn.'t work.

bool main::setupTreeView ( QTreeWidget * thetwmTreeWidget )
{
	QList<QTreeWidgetItem *> items;
 
	if ( listtwmConfigPool.size() != 0 )
	{
		for ( int i = 0; i < myObject.size() ; i++ )
		{
			QTreeWidgetItem * tempQTreeWidgetItem = new QTreeWidgetItem ();
			tempQTreeWidgetItem->setText ( 0 , myObject.getName() );
			tempQTreeWidgetItem->setExpanded( true );
			qDebug() << tempQTreeWidgetItem->isExpanded(); // it's false...why?
			items.append ( tempQTreeWidgetItem );
 
			for ( int i = 0; i < myObjectParent.size(); i++ )
			{
				QTreeWidgetItem * tempQTreeWidgetItemParent = new QTreeWidgetItem ( tempQTreeWidgetItem );
				tempQTreeWidgetItemParent->setText ( 0 , myObjectParent.getName() );
				items.append ( tempQTreeWidgetItemParent );
			}
		}
 
		thetwmTreeWidget->setColumnCount (1);
		thetwmTreeWidget->insertTopLevelItems (0, items);
	}
	return TRUE;
}

bool main::setupTreeView ( QTreeWidget * thetwmTreeWidget )
{
	QList<QTreeWidgetItem *> items;
	
	if ( listtwmConfigPool.size() != 0 )
	{
		for ( int i = 0; i < myObject.size() ; i++ )
		{
			QTreeWidgetItem * tempQTreeWidgetItem = new QTreeWidgetItem ();
			tempQTreeWidgetItem->setText ( 0 , myObject.getName() );
			tempQTreeWidgetItem->setExpanded( true );
			qDebug() << tempQTreeWidgetItem->isExpanded(); // it's false...why?
			items.append ( tempQTreeWidgetItem );
			
			for ( int i = 0; i < myObjectParent.size(); i++ )
			{
				QTreeWidgetItem * tempQTreeWidgetItemParent = new QTreeWidgetItem ( tempQTreeWidgetItem );
				tempQTreeWidgetItemParent->setText ( 0 , myObjectParent.getName() );
				items.append ( tempQTreeWidgetItemParent );
			}
		}
		
		thetwmTreeWidget->setColumnCount (1);
		thetwmTreeWidget->insertTopLevelItems (0, items);
	}
	return TRUE;
}

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thanks

[jpn]

To me it looks like you're expanding items by the time they're added nowhere yet. Have you noticed QTreeView::expandAll()?

Edit: Oh, and I just noticed something else that's faulty too. You're adding parents and children to the same list for which you do insertTopLevelItems().

[mattia]

yes, when i call setExpanded the items aren't allocated into the parent yet...where should i call setExpand?

[jpn]

The code of yours is confusing because an item you call "parent" is actually created as child. However, this should do the trick:

bool main::setupTreeView ( QTreeWidget * thetwmTreeWidget )
{
    QList<QTreeWidgetItem *> items;
 
    if ( listtwmConfigPool.size() != 0 )
    {
        for ( int i = 0; i < myObject.size() ; i++ )
        {
            QTreeWidgetItem * tempQTreeWidgetItem = new QTreeWidgetItem ();
            tempQTreeWidgetItem->setText ( 0 , myObject.getName() );
            //tempQTreeWidgetItem->setExpanded( true );
            //qDebug() << tempQTreeWidgetItem->isExpanded(); // it's false...why?
            items.append ( tempQTreeWidgetItem );
 
            for ( int i = 0; i < myObjectParent.size(); i++ )
            {
                QTreeWidgetItem * tempQTreeWidgetItemParent = new QTreeWidgetItem ( tempQTreeWidgetItem );
                tempQTreeWidgetItemParent->setText ( 0 , myObjectParent.getName() );
                //items.append ( tempQTreeWidgetItemParent ); // <--- get rid of this
            }
        }
 
        thetwmTreeWidget->setColumnCount (1);
        thetwmTreeWidget->insertTopLevelItems (0, items);
        thetwmTreeWidget->expandAll(); // <--- add this
    }
    return TRUE;
}

bool main::setupTreeView ( QTreeWidget * thetwmTreeWidget )
{
    QList<QTreeWidgetItem *> items;

    if ( listtwmConfigPool.size() != 0 )
    {
        for ( int i = 0; i < myObject.size() ; i++ )
        {
            QTreeWidgetItem * tempQTreeWidgetItem = new QTreeWidgetItem ();
            tempQTreeWidgetItem->setText ( 0 , myObject.getName() );
            //tempQTreeWidgetItem->setExpanded( true );
            //qDebug() << tempQTreeWidgetItem->isExpanded(); // it's false...why?
            items.append ( tempQTreeWidgetItem );

            for ( int i = 0; i < myObjectParent.size(); i++ )
            {
                QTreeWidgetItem * tempQTreeWidgetItemParent = new QTreeWidgetItem ( tempQTreeWidgetItem );
                tempQTreeWidgetItemParent->setText ( 0 , myObjectParent.getName() );
                //items.append ( tempQTreeWidgetItemParent ); // <--- get rid of this
            }
        }

        thetwmTreeWidget->setColumnCount (1);
        thetwmTreeWidget->insertTopLevelItems (0, items);
        thetwmTreeWidget->expandAll(); // <--- add this
    }
    return TRUE;
}

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[mattia]

ok, in this way i can expand all the items in my treeWidget but if i want to expand just some of them?
can't i set the expand propriety into the "for"? so i can control which node expand..

[jpn]

Yes, but then you will have to actually add the item to the tree before expanding it. Currently, you have a list of items that do not yet belong to any tree at all. You can for example pass the tree widget to QTreeWidgetItem constructor instead of collecting them to a list.

[mattia]

got it
thx so much!