CODEWITHSUNDEEP
qtqt5qwebengineview
AJ Cole
AJ Cole

Reputation: 179

QWebEngineView how to disable pinch-to-zoom

I'm running a Qt 5.9.4 app with QWebView on a touch linux device displaying HTML webpages.

When users pinch their fingers on the screen, they zoom into the webpage. I want to disable that behaviour, because all the webpages should be 100% fullscreen.

I could temporarily disable it in the webpages (since I own their code) by adding user-scalable=no to the viewport, but that wont work in the long run because not every webpage will have that.

I tried to use eventFilter on different elements of my app, but couldn't get any Gesture or even Mouse event to catch.

This is how I create my webview (in a QDialog):

void Dialog::createWebView() {
  view = new QWebEngineView(this);
  profile = new QWebEngineProfile();
  page = new QWeEnginePage(profile);
  view->setPage(page);
  view->setUrl(QUrl(path));
}

This is my eventFilter class:

EvFilter::EvFilter(QObject *parent) : QObject(parent)
{

}

bool EvFilter::eventFilter(QObject *obj, QEvent *event)
{

    qDebug() << event->type() << "\n";
    return QObject::eventFilter(obj, event);
}

I have tried doing

EvFilter* evf = new EvFilter();
view->installEventFilter(evf);

And also on every other element (profile, page, dialog) but couldn't seem to get any events corresponding to mouse or gesture. What am I doing wrong? How could I prevent that behaviour in the entire webview?

After adding the event listener to the QApplication object, I can detect TouchBegin, TouchUpdate, TouchCancel and TouchEnd events, but nothing else (no Gesture event). I dont know how could I detect if the touchevent is the zoom gesture.

Upvotes: 0

Views: 1790

Answers (1)

Hans
Hans

Reputation: 91

I think you could use this on the Dialog (didn't test it). I had some other widget showing a QML QtWebView and what I did to prevent the widget's children to get Pinch Gestures is:

this->grabGesture(Qt::PinchGesture, Qt::DontStartGestureOnChildren);

This prevents the underlying widget from receiving the PinchGesture, so that you can handle it yourself.

Upvotes: 1

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