Kinetic Scrolling on QScrollarea on Android device ..

p3c0

Hello,

I want to enable kinetic scrolling on a QScrollArea, so as per the Qt5.1 docs i used
QScroller::grabGesture(m_scrollarea,QScroller::TouchGesture);
But the scroll does not happen at all on the device, it works on using QScroller::LeftMouseButtonGesture.
I have also done setAttribute(Qt::WA_AcceptTouchEvents,true) for the scrollarea.

Any thing more that i need to enable ?

Update:

Kinetic scrolling using QScroller works on QListWidget.
How to make it work on QScrollArea?

Following is my test code:

QScrollArea *sa = new QScrollArea(this);
sa->setFrameStyle(QFrame::NoFrame);
sa->setFrameShadow(QFrame::Plain);
sa->setWidgetResizable(true);
sa->resize(800,480);

ScrollContentDialog *m_diag = new ScrollContentDialog(sa);  // Contains a loop where i add 50 QLabels
m_diag->setMinimumSize(0,(50*30));
m_diag->show();

sa->setWidget(m_diag);
sa->show();

// QListWidget *m_list = new QListWidget(this);
// m_list->setGeometry(0,0,800,480);
// m_list->setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
// for (int i = 0; i < 200; ++i)
// new QListWidgetItem(QString("This is a test text %1 %2").arg(i).arg(QString("--------").left(i % 8)), m_list);

QAbstractScrollArea *area = qobject_cast<QAbstractScrollArea *>(sa); // Replace here m_list for QListWidget test
QScroller::grabGesture(area->viewport(), QScroller::TouchGesture);

AcerExtensa

Please use "code" tags. It is just hard to read you test code...

vladstelmahovsky

I'd recommend you to use QML for this

plinioandrade

Hey everyone,
I have the same problem here. I can't not make the QScrollArea works with gesture actions. My problem is exactly the same. I did everything like you but it isn't working. I'm using Qt 5.3.1 on Windows and a Samsung Galaxy S4 for tests. If someone found the solution, please share with us. Sincerely,

plinioandrade

Hey every one. I figured out the problem. For some Reason the code
@this->ui->scrollArea->viewport()->setAttribute(Qt::WA_AcceptTouchEvents);
QScroller::grabGesture(this->ui->scrollArea->viewport(), QScroller::TouchGesture);
@
doesn’t work for QScrollArea. Then I used a class called FlickCharm [blog.qt.digia.com]. It was developed by Ariya Hidayat [blog.qt.digia.com] and it is working good now.
Not satisfied I tried to use the QScroller again but this time with the parameter QScroller::LeftMouseButtonGesture that is:
@QScroller::grabGesture(this->ui->scrollArea->viewport(), QScroller::LeftMouseButtonGesture);@

and…. It works for Mouse Event and for Touch Event on my Samsumg Galaxy S4. Now I’m happy because I’m just using the native class QScroller and it’s working so good. I hope to help more people in the same situation. Sincerely.