Hi everybody,
i was learning qlistview and writing simple application for testing. First of all the sample code:

Qt Code: 
  1. #include <QApplication>
  2. #include <QVBoxLayout>
  3. #include <QListView>
  4. #include <QLabel>
  5. #include <QStringListModel>
  6. #include <QStringList>
  7.  
  8. class MyWidget: public QWidget
  9. {
  10. Q_OBJECT
  11.  
  12. public:
  13. MyWidget(QWidget *parent=0);
  14.  
  15. private slots:
  16. void currentSelected(const QModelIndex &);
  17.  
  18. private:
  19. QListView *listView;
  20. QLabel *selectedItemText;
  22. };
  23.  
  24. MyWidget::MyWidget(QWidget *parent)
  25. :QWidget(parent)
  26. {
  27. listView = new QListView;
  28. selectedItemText = new QLabel;
  29.  
  30. model = new QStringListModel();
  32. list << "lemons" << "melons" << "oranges" << "pears"
  33. << "grapes" << "apples" << "potatoes";
  34. model->setStringList(list);
  35.  
  36. listView->setModel(model);
  37.  
  38. QVBoxLayout *layout = new QVBoxLayout;
  39. layout->addWidget(listView);
  40. layout->addWidget(selectedItemText);
  41. setLayout(layout);
  42.  
  43. connect(listView, SIGNAL(clicked(const QModelIndex&)),
  44. this, SLOT(currentSelected(const QModelIndex &)));
  45. }
  46.  
  47. void MyWidget::currentSelected(const QModelIndex &current)
  48. {
  49. selectedItemText->setText(current.data().toString());
  50. }
  51.  
  52. int main(int argc, char *argv[])
  53. {
  54. QApplication app( argc, argv );
  55.  
  56. QWidget *window = new QWidget;
  57. window->setWindowTitle("Sample ListView");
  58.  
  59. MyWidget *myWidget = new MyWidget;
  60.  
  61. QVBoxLayout *mainLayout = new QVBoxLayout;
  62. mainLayout->addWidget(myWidget);
  63. window->setLayout(mainLayout);
  64. window->show();
  65.  
  66. return app.exec();
  67. }
  68.  
  69. #include "main.moc"
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My questions are:

1) How start the application with some item already selected?
With the code above when an item is selected the QLabel is filled with the item data; but when the application starts no item is selected and the label is empty.

2) How bind the function currentSelected(const QModelIndex &) with up/down arrows keys?
In the application if I move the selection with the up/arrow keys the highlighted item changes but the label is not updated with the text of the highlighted item. I want the behavior of mouse single click with up/arrow keys.

3) How change the double-click event?
Now when an item is double-clicked the item goes in edit mode; i don't want this. Double-click like single-click is sufficient for me.

Hoping i was clear, thanks in advance for helping me.
Giuseppe