Qt 5.3.2 android app not receiving gesture event.

Doc X

I'm just starting the process to move some of my pc touchscreen software to android. I'm creating a very simple program that is supposed to do three things. Draw a black screen, put the time in the lower left corner, and check for a left swipe.

I used the ImageGestures example as my starting point, but greatly simplified it. When the app starts, I see the message that a swipe gesture event is being grabbed.

When I swipe, I see "TouchBegins", "TouchUpdate", and "TouchEnd" events, but never a "Gesture" event.

I've poured over the code, tweaked this and that (adding/subtracting gestures, etc) but have never seen a gesture event. Is there something I'm missing?

main.cpp
@
int main(int argc, char *argv[])
{
QApplication a(argc, argv);

MainWindow w;

qDebug() << "Welcome to Qt" << QT_VERSION_STR;

QList<Qt::GestureType> gestures;
gestures << Qt::SwipeGesture;

w.grabGestures(gestures);
w.show();

return a.exec&#40;&#41;;

}
@

mainwindow.cpp
@
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
idleWidget(new IdleWidget(this))
{
setCentralWidget(idleWidget);
}

void MainWindow::grabGestures(const QListQt::GestureType &gestures)
{
idleWidget->grabGestures(gestures);
}
@

idlewidget.ccp
@
IdleWidget::IdleWidget(QWidget *parent) :
QWidget(parent)
{
}

void IdleWidget::grabGestures(const QListQt::GestureType &gestures)
{
foreach (Qt::GestureType gesture, gestures)
{
qDebug() << "grabbing gesture" << gesture;
grabGesture(gesture);
}
}

void IdleWidget::paintEvent(QPaintEvent *)
{
QTime time = QTime::currentTime();
QString timeNow = time.toString("h:mmap");

QPainter p(this);
p.fillRect(0, 0, width(), height(), Qt::black);

p.setPen(QPen(Qt::white));
p.drawText(QRect(0, 0, width(), height()), Qt::AlignLeft | Qt::AlignBottom, timeNow);

p.end();

}

bool IdleWidget::event(QEvent *event)
{
qDebug() << "event():" << event->type();

if (event->type() == QEvent::Gesture)
    return gestureEvent(static_cast<QGestureEvent*>(event));

return QWidget::event(event);

}

bool IdleWidget::gestureEvent(QGestureEvent *event)
{
qDebug() << "gestureEvent():" << event->gestures().size();

if (QGesture *swipe = event->gesture(Qt::SwipeGesture))
    swipeTriggered(static_cast<QSwipeGesture *>(swipe));

return true;

}

void IdleWidget::swipeTriggered(QSwipeGesture *gesture)
{
if (gesture->state() == Qt::GestureFinished)
{
if (gesture->horizontalDirection() == QSwipeGesture::Left)
{
qDebug() << "LEFT swipeTriggered()";
}
}
}
@

Doc X

Upon further review, my problem was more specific to not receiving swipe events on the android platform. Tap and TapAndHold work, for example.

What I ended up doing was creating my own swipe gesture recognizer based on this code:

http://developer.nokia.com/community/wiki/Custom_Swipe_Gestures_in_Qt

There are a couple of easily fixed bugs in that code, but it seems to work just fine.