Implement Shortcuts to select items in QComboBox

lucadanieli

Hello,

can someone help me in adding Shortcuts to QComboBox? I don't understand very well ho to implement it and I don't find clear solution on other threads, so I'll try to write it in order to help future searches.

I reimplemented QComboBox like:
@
class BoxPopupMenu : public QComboBox
{

public:
BoxPopupMenu(QWidget parent = 0) :
QComboBox(parent)
{
view()->installEventFilter(this);
};
@
I reimplemented the keyPressEvent(), to add new Shortcuts (technically, this is the area where I set the code to be executed when specific Key() are pressed):
@
void keyPressEvent(QKeyEvent e)
{
if (Qt::Key_Up == e->key() || Qt::Key_Down == e->key())
return;

    if (Qt::Key_Left == e->key())
    {
        ..code..
    }
    ...
}

@
then I discovered that, to let the popup change the item, I have to create an eventFilter to be added to the method view()->installEventFilter(this);

So I wrote:
@
bool eventFilter(QObject *t, QEvent *e)
{
if(e->type() == QEvent::KeyPress) //here I choose what kind of Event I'm interested in
{
QKeyEvent keyEvent = static_cast<QKeyEvent>(e); //here, I return what is the key pressed
int key = keyEvent->key();

       [...]
    }
return ...
}

@
Now, what I miss is how to fill [...] and what to return at the end.
Should I return a sendEvent? Is the receiver the QObject *t? What is the event to send?

[andreyc EDIT]: Add '@' around code.

lucadanieli

I'm sorry for the bad layout but the website set it automatically

lucadanieli

This is what I have done, and in Linux it works.

I have implemented a CTRL+Tab which changes the item and the document associated to it.

@class BoxPopupMenu : public QComboBox
{

public:
BoxPopupMenu(QWidget *parent = 0) :
QComboBox(parent)
{
view()->installEventFilter(this);
};

private:
bool eventFilter(QObject *t, QEvent *e)
{
QKeyEvent keyEvent = static_cast<QKeyEvent>(e);
int key = keyEvent->key();

    if(e->type() == QEvent::KeyPress)
    {
        switch(key)
        {
            case Qt::Key_Backtab:
            //case Qt::Key_Up:
            {
                // changes the index
                int curIndex = this->currentIndex();
                int nextIndex;

                if (this->currentIndex() == 0)
                    nextIndex = this->count() -1;
                else {
                    nextIndex = curIndex - 1;
                }

                this->setCurrentIndex(nextIndex);

                // changes the item selection
                QComboBox::keyPressEvent(keyEvent);

                break;
            }
            case Qt::Key_Tab:
            //case Qt::Key_Down:
            {
                int curIndex = this->currentIndex();
                int nextIndex;

                if (this->currentIndex() == this->count() -1 )
                    nextIndex = 0;
                else {
                    nextIndex = curIndex + 1;
                }

                this->setCurrentIndex(nextIndex);

                QComboBox::keyPressEvent(keyEvent);

                break;
            }
        }
    }

    if(e->type() == QEvent::KeyRelease)
    {
        switch(key)
        {
            case Qt::Key_Control:
                this->hidePopup();
        }
    }
    return true;
}

};@