// In tree view constructor

connect(this, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(itemDoubleClicked(QModelIndex)));
connect(this, SIGNAL(itemDoubleClickedSignal(QString)), tabPane, SLOT(fileOpen(QString)));

// In tree view class

private slots:
	void itemDoubleClicked(QModelIndex index);
	
signals:
	void itemDoubleClickedSignal(QString filename);

// In tab pane class

public slots:
	void openFile(QString filename);

// In itemDoubleClicked

void ProjectView::itemDoubleClicked(QModelIndex index)
{
	emit itemDoubleClickedSignal(model->itemForIndex(index).url().url(KUrl::RemoveTrailingSlash));
}