On Thursday 19 December 2013 09:19:38 Rick Stockton wrote:
> On 12/18/2013 01:10 PM, Andreas Aardal Hanssen wrote:
> > On 18 Dec 2013, at 22:07, Rayner Pupo Gómez <[email protected]> wrote:
> Inner-most quote is from Martin Koller.
>
> >>> I've discovered that with Qt5 I get a different order of mouse events on
> >>> a QWidget than with Qt4 (openSuse 13.1 Linux, X11):
> >>> double clicking a widget results in Qt4 in:
> >>> mousePressEvent
> >>> mouseReleaseEvent
> >>> mouseDoubleClickEvent
> >>> mousePressEvent
> >>> mouseReleaseEvent
> >>> but in Qt5 in:
> >>> mousePressEvent
> >>> mouseReleaseEvent
> >>> mousePressEvent
> >>> mouseDoubleClickEvent
> >>> mouseReleaseEvent
> >>> I tested with Qt4.8.5 and Qt5.2.
> >>> Is this behavioral change intended, undefined, a bug ?
> >>> (it results in my app not behaving as before ...)
> >> I think it's a mistake to rely on the order of this kind of events, there
> >> are
> >> fired asynchronously, your logic cant depend on this
> > Wrong! The order is very essential and can and must be relied on.
> > The behaviour in Qt 5 is questionable. I believe the double-click must come
> > first to be able to distinguish from two presses.
> >
> > I also wonder if it's accurate / true that Qt 4 sends the second press
> > after the double-click. AFAIR:
> >
> > Press
> > Release
> > DoubleClick
> > Release
> >
> > Is the right events for double-clicking.
> >
> > Andreas
> Andreas, I'm confirming the QT5 behavior, to be as Martin describe. BUT,
> the Qt4 behavior seems to be as YOU recall - no ButtonPress" at all for
> the fast-enough second click which invoked a "DoubleClick event.
I'm not making things up. This is what my testprogram gives.
I attach it here.
--
Best regards/Schöne Grüße
Martin
A: Because it breaks the logical sequence of discussion
Q: Why is top posting bad?
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#include <QApplication>
#include <QWidget>
#include <QMouseEvent>
class Widget : public QWidget
{
public:
Widget(QWidget *parent) : QWidget(parent)
{
}
virtual void mousePressEvent(QMouseEvent *event)
{
qWarning("mousePressEvent");
QWidget::mousePressEvent(event);
event->accept();
}
virtual void mouseReleaseEvent(QMouseEvent *event)
{
qWarning("mouseReleaseEvent");
QWidget::mouseReleaseEvent(event);
event->accept();
}
virtual void mouseDoubleClickEvent(QMouseEvent *event)
{
qWarning("mouseDoubleClickEvent");
QWidget::mouseDoubleClickEvent(event);
event->accept();
}
};
int main(int argc, char **argv)
{
QApplication app(argc, argv);
Widget *w = new Widget(0);
w->show();
return app.exec();
}
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