On Aug 20, 2015, at 8:57 AM, Michael R Nelson
<[email protected]<mailto:[email protected]>> wrote:
*External Message - use caution*
I have the same question as Edward Sutton, but as applied to a QML ComboBox. Is
there an easy way to prevent a mouse wheel scroll over a QML ComboBox from
changing the index of the ComboBox? My users complain it causes them to
frequently make unintended changes.
This behavior is wrong. I cannot find any examples OS X or Windows apps that
behave like this unless they were written in Qt.
It is a bug in QComboBox behavior. Developers should not have to subclass
QComboBox or install event filters to make it behave like a normal combobox
should behave by default.
class ComboBox : public QComboBox
{
Q_OBJECT
public:
explicit ComboBox::ComboBox(QWidget *parent) : QComboBox(parent)
{
this->setFocusPolicy(Qt::StrongFocus);
}
protected:
#ifndef QT_NO_WHEELEVENT
/// Fix unexpected scrollwheel behavior for OSX and Windows users
/// where QComboBox index changes when user moves mouse scrollwheel
/// when mouse *hovering* (no mouse click involved - just hovering ) over
QComboBox
void ComboBox::wheelEvent( QWheelEvent * e)
{
if (false == hasFocus())
{
e->ignore();
return;
}
QComboBox::wheelEvent(e);
}
#endif
};
Developers need a focus property or style sheet that makes the QComboBox
default behavior behave like a desktop users expects a normal combobox to
behave.
-Ed
From:
[email protected]<mailto:[email protected]>
[mailto:[email protected]] On Behalf Of
Edward Sutton
Sent: Thursday, August 20, 2015 9:15 AM
To: Interests Qt <[email protected]<mailto:[email protected]>>
Subject: Re: [Interest] [External] Re: How to prevent scroll changing QComboBox
index when mouse hovers?
Thanks Reinhardt. Installing an eventFilter seems to be the required solution
to fix the incorrect QComboBox behavior.
On Aug 20, 2015, at 8:03 AM, Reinhardt Behm
<[email protected]<mailto:[email protected]>> wrote:
*External Message - use caution*
On Thursday 20 August 2015 12:55:12 Edward Sutton wrote:
If user hovers mouse cursor (with out clicking) over a QComboBox and scrolls
the mouse wheel the combo index scrolls. This is unexpected behavior for
both OS X and Windows users. The result is to cause users to make
unintentional changes in my app.
Is there an easy way to prevent this unexpecetd behavior?
Or does it require replacing al QComboBox items with a derived version that
filters events?
-Ed
Install an eventFilter on the QComboBox?
I was hoping that focusPolicy would provide an easy solution. Neither
StrongFocus nor NoFocus prevents this behavior.
This behavior is considered a bug in the QComboBox behavior by *both* OS X and
Windows users.
-Ed
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