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  1. #1
    Join Date
    Aug 2012
    Posts
    9
    Qt products
    Qt4
    Platforms
    Unix/X11 Windows

    Default Telling apart single click and double click in QTableView

    Hi,

    I'm using a QTableView (cannot change to QTableWidget) and need a Delegate (not an editor) to do different actions on single and double mouse clicks. The basic idea I came up with is to start a QTimer on a QEvent::MouseButtonRelease and either stop it on receiving a QEvent::MouseButtonDblClick and depending on the program state maybe open a new QWindow or if no double click event is received to change something on the delegate.

    The other QWindow is started through the doubleClicked signal in a controller class:
    Qt Code:
    1. connect(m_table, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(maybeOpenQWindow(QModelIndex)));
    To copy to clipboard, switch view to plain text mode 

    This is my Delegate's event handling:

    Qt Code:
    1. bool MyDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index)
    2. {
    3. if (QEvent::MouseButtonRelease)
    4. {
    5. qDebug() << "single click";
    6. m_timer->start();
    7. event->accept();
    8. return true;
    9. }
    10. else if (event->type() == QEvent::MouseButtonDblClick)
    11. {
    12. qDebug() << "double click";
    13. m_timer->stop();
    14. event->accept();
    15. return true;
    16. }
    17. else
    18. {
    19. return false;
    20. }
    21. }
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    I saw in the source code, that QAbstractItemView::mouseDoubleClickEvent is sending out a mouse press event like QWidget::mouseDoubleClickEvent so I overloaded it with an empty function in my QTableView and verified it isn't run.

    But I get mixed results.

    Double click on MyDelegate while it is focused and no new QWindow is started:

    Qt Code:
    1. single click
    2. double click
    3. single click
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    Where do I get the excess single click event from?
    (in this case my timer is started again and the undesired single click action is executed, but a double click should be ignored if no new QWindow is started)

    Double click on MyDelegate while it is focused and a new QWindow is started:

    Qt Code:
    1. single click
    2. double click
    To copy to clipboard, switch view to plain text mode 

    Why do those situations behave differently?

    To sum it up:
    I need my delegate to
    * always react on a single click (i.e. repaint differently)
    * either start a new QWindow or ignore a double click, depending on programs state

    Any suggestions how I can achieve this? Completely different approaches are welcome as well.

    Cheers
    jgirlich
    Last edited by jgirlich; 26th February 2013 at 15:45. Reason: opening new QWindow depends on program state

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