Get selected index of a QListView by using installEventFilter its viewport

[jbecker]

Hello,

I am currently programming a widget [called CameraWidget] which contains a QListView [called m_cameraListView] and a QTreeView [called m_parameterTreeView]. The m_parameterTreeView should update according to the selection made in the m_cameraListView. My current strategy is to let the CameraWidget control all events on its children by using installEventFilter:

CameraWidget::CameraWidget(QWidget *parent, Qt::WFlags flags)
{
	m_model = new CameraTreeModel();
 
	m_mainLayout = new QVBoxLayout();
	this->setLayout(m_mainLayout);
 
	m_grabButton = new QPushButton("Grab image");
	m_mainLayout->addWidget(m_grabButton);
 
	m_cameraListView = new QListView();
	m_cameraListView->setModel(m_model);
	m_mainLayout->addWidget(m_cameraListView);
 
	m_parameterTreeView = new QTreeView();
	// [...]
	m_mainLayout->addWidget(m_parameterTreeView);
 
	m_cameraListView->viewport()->installEventFilter(this);
}

CameraWidget::CameraWidget(QWidget *parent, Qt::WFlags flags)
{
	m_model = new CameraTreeModel();

	m_mainLayout = new QVBoxLayout();
	this->setLayout(m_mainLayout);

	m_grabButton = new QPushButton("Grab image");
	m_mainLayout->addWidget(m_grabButton);

	m_cameraListView = new QListView();
	m_cameraListView->setModel(m_model);
	m_mainLayout->addWidget(m_cameraListView);

	m_parameterTreeView = new QTreeView();
	// [...]
	m_mainLayout->addWidget(m_parameterTreeView);

	m_cameraListView->viewport()->installEventFilter(this);
}

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This is how I have seen it done in several tutorials (citation needed?) and I hope that the general approach is correct... However, in my event filter, I can't seem to get the selected item when a list item of m_cameraListView is clicked! It seems that the viewport() doesn't have the SelectedIndexes() method.

Being relatively new to Qt programming, I am kinda stuck here... I would appreciate any advice very much! Thanks in advance!

--
Johannes

---

Added after 20 minutes:

Just to provide some useful information on what I'm trying to do:

bool CameraWidget::eventFilter(QObject *obj, QEvent *event)
{
	if(event->type() == QEvent::MouseButtonRelease)
	{
		// extract the selected index of m_cameraListView and do something with it! (e.g. update m_parameterTreeWidget)
		// [...]
		return true;
	}
	return QWidget::eventFilter(obj,event);
}

bool CameraWidget::eventFilter(QObject *obj, QEvent *event)
{
	if(event->type() == QEvent::MouseButtonRelease)
	{
		// extract the selected index of m_cameraListView and do something with it! (e.g. update m_parameterTreeWidget)
		// [...]
		return true;
	}
	return QWidget::eventFilter(obj,event);
}

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How would I do that? Thanks!

[bothorsen]

event filters should only be used in emergencies, and this is not one of them. You need to connect to the signals of the views instead.