Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-73027

QWidgets never receive swipe gestures

    XMLWordPrintable

Details

    • Bug
    • Resolution: Unresolved
    • P1: Critical
    • None
    • 5.12.0
    • Widgets: Gesture Support
    • None
    • macOS 10.13.6 (17G4015)
      Xcode 10.1 (10B61)
    • iOS/tvOS/watchOS

    Description

      Trying to grab swipe gestures on QWidget objects with grabGesture(Qt::SwipeGesture) does not work. QWidget::event() never receives a QGestureEvent. Grabbing other gestures (like Qt::TapGesture or Qt::TapHoldGesture) works fine. Qt::SwipeGesture does not.

      Code that reproduces the issue:

      #include <QApplication>
#include <QGestureEvent>
#include <QMainWindow>

class MainWindow: public QMainWindow
{
protected:
    bool event(QEvent* e) override
    {
        if (e->type() == QEvent::Gesture) {
            auto* gestEv = static_cast<QGestureEvent*>(e);
            if (gestEv->gesture(Qt::SwipeGesture) != nullptr) {
                abort();
            }
        }
        return false;
    }
};

int main(int argc, char* argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.grabGesture(Qt::SwipeGesture);
    w.show();
    return a.exec();
}

      Swiping does not abort the app. This is true for both the iOS Simulator as well as real hardware (iPhone 8 and iPad Air.)

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-15768 Swipe gesture doesn't work with the imagegestures example

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-138601 Swipe gesture does not work on Windows

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; Flaky tests; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • In Progress

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-46195 [Windows]: Swipe gesture is not always recognized and sometimes in the wrong direction

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-14895 Qt Gestures - Pan and Swipe are not working

          • P4: Low - Would be nice to fix, but it's not very important.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-30741 When using -no-native-gestures on Windows, the swipe gesture is not picked up

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-37759 QWidget-gestures do not work

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          No reviews matched the request. Check your Options in the drop-down menu of this sections header.

          Activity

            People

              qt.team.quick.subscriptions Qt Quick and Widgets Team
              realnc Nikos Chantziaras
              Votes:
              2 Vote for this issue
              Watchers:
              2 Start watching this issue

              Dates

                Created:
                Updated:

                Gerrit Reviews

                  There are no open Gerrit changes