amount of items in QTreeWidget

[supergillis]

As the title says, is there a way to get the amount of QTreeWidgetItems in a QTreeWidget?

Is there also a way to get a specified item by its location in the QTreeWidget? For example:

QTreeWidget* tree = new QTreeWidget();
QTreeWidgetItem* item = new QTreeWidgetItem();
int index = tree->addTopLevelItem(item);
QTreeWidgetItem* itemAtIndex = tree->getItemAtIndex(index);
if(item == itemAtIndex)
cout << "works!";
int amount = tree->getItemCount();
for(int i = 0; i < amount; i++)
cout << tree->getItemAtIndex(i).text(0).toStdString();

QTreeWidget* tree = new QTreeWidget();
QTreeWidgetItem* item = new QTreeWidgetItem();
int index = tree->addTopLevelItem(item);
QTreeWidgetItem* itemAtIndex = tree->getItemAtIndex(index);
if(item == itemAtIndex)
cout << "works!";
int amount = tree->getItemCount();
for(int i = 0; i < amount; i++)
cout << tree->getItemAtIndex(i).text(0).toStdString();

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[jpn]

You can access top level items via QTreeWidget::topLevelItem(int index) and children of particular items via QTreeWidgetItem::child(int index). But there is no way to access arbitrary items in the tree with an "universal" index. However, QTreeWidgetItemIterator might become handy in case of looking for certain items.

[supergillis]

Thanks for the fast reply.

I found out QWidgetItemIterator already but it was just not I was looking for... I need these functions actually for a music player to go to a random next song. Example:

void MP3::playNextSong()
{
	std::cout << "void MP3::playNextSong() called" << std::endl;
	timer->stop();
	QTreeWidgetItemIterator it(g_main->musicList);
	bool found = false;
	int random = rand()%10;
	while(random == id)
		random = rand()%10;
	std::cout << "void MP3::playNextSong() rand=" << random << std::endl;
	while(*it)
	{
		QTreeWidgetItem* item = *it;
		if(item && item->text(1).toInt() == random)
		{
			load(item->text(0).toStdString(), random);
			play();
			found = true;
			break;
		}
		++it;
	}
	if(!found)
	{
		std::cout << "void MP3::playNextSong() found=false " << std::endl;
		playNextSong();
	}
}

void MP3::playNextSong()
{
	std::cout << "void MP3::playNextSong() called" << std::endl;
	timer->stop();
	QTreeWidgetItemIterator it(g_main->musicList);
	bool found = false;
	int random = rand()%10;
	while(random == id)
		random = rand()%10;
	std::cout << "void MP3::playNextSong() rand=" << random << std::endl;
	while(*it)
	{
		QTreeWidgetItem* item = *it;
		if(item && item->text(1).toInt() == random)
		{
			load(item->text(0).toStdString(), random);
			play();
			found = true;
			break;
		}
		++it;
	}
	if(!found)
	{
		std::cout << "void MP3::playNextSong() found=false " << std::endl;
		playNextSong();
	}
}

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Now I'm using "rand()%10" only for testing with 10 items. But I need to know the actual count of the items in the tree, or I would have to manually change the count all the time...

Of course I can also try to make my own extended class and do this:

MyTreeWidget::addTopLevelItem(QTreeWidgetItem* item)
{
	this->count++;
	QTreeWidget::addTopLevelItem(item);
}

MyTreeWidget::addTopLevelItem(QTreeWidgetItem* item)
{
	this->count++;
	QTreeWidget::addTopLevelItem(item);
}

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EDIT: I just saw this function too: QTreeWidget::topLevelItemCount (). Is this the function I'm looking for?
EDIT 2: Works now . But is there a way to hide a column of a QTreeWidget?

[jpn]

EDIT: I just saw this function too: QTreeWidget::topLevelItemCount (). Is this the function I'm looking for?

Sure, if you have top level items only ie. you don't have hierarchical structure.

EDIT 2: Works now . But is there a way to hide a column of a QTreeWidget?

See QTreeView::setColumnHidden().

[supergillis]

Great man! Thanks!