Details
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Bug
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Resolution: Invalid
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Not Evaluated
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None
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5.15.12
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None
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Windows 10, Intel CPU
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Windows
Description
Hello, I just came across an issue with touch events. I wanted to have my pop-ups (with Qt::Popup set) to receive touch events when I touch the screen. But I got mouse events instead.
Accroding to the doc, "When the application opens a popup widget, all events are sent to the popup. " So I do expect touch events go to pop-up unconverted, and that could potentially make my code logic more consistent.
Is it possible for pop-ups to receive proper touch events?
Also, a reproducing example. I expect Label's text to say "Touch event ..." when touched, got "Mouse button pressed..." instead.
Thank you in advance!
#include <QApplication> #include <QWidget> #include <QPushButton> #include <QLabel> #include <QEvent> #include <QMouseEvent> class Label : public QLabel { public: using QLabel::QLabel; bool event(QEvent* e) override { if (e->type() == QEvent::MouseButtonPress) { QMouseEvent* mouseEvent = static_cast<QMouseEvent*>(e); setText("Mouse button pressed at (" + QString::number(mouseEvent->x()) + ", " + QString::number(mouseEvent->y()) + ")"); return true; } else if (e->type() == QEvent::MouseButtonRelease) { QMouseEvent* mouseEvent = static_cast<QMouseEvent*>(e); setText("Mouse button released at (" + QString::number(mouseEvent->x()) + ", " + QString::number(mouseEvent->y()) + ")"); return true; } else if (e->type() == QEvent::TouchBegin) { QTouchEvent* touchEvent = static_cast<QTouchEvent*>(e); QList<QTouchEvent::TouchPoint> touchPoints = touchEvent->touchPoints(); QString touchText = "Touch event with " + QString::number(touchPoints.size()) + " touch points: "; for (const QTouchEvent::TouchPoint& touchPoint : touchPoints) { touchText += "ID: " + QString::number(touchPoint.id()) + " at (" + QString::number(touchPoint.pos().x()) + ", " + QString::number(touchPoint.pos().y()) + "); "; } setText(touchText); return true; } else if (e->type() == QEvent::TouchEnd) { QTouchEvent* touchEvent = static_cast<QTouchEvent*>(e); QList<QTouchEvent::TouchPoint> touchPoints = touchEvent->touchPoints(); setText("Touch event ended with " + QString::number(touchPoints.size()) + " touch points"); return true; } return QLabel::event(e); } }; int main(int argc, char *argv[]) { QApplication app(argc, argv); app.setAttribute(Qt::AA_SynthesizeMouseForUnhandledTouchEvents, false); app.setAttribute(Qt::AA_SynthesizeTouchForUnhandledMouseEvents, false); QWidget parent; parent.resize(700, 700); QPushButton popupButton("Open Popup", &parent); popupButton.move(100, 80); Label popupLabel("This is a Popup", &parent); popupLabel.resize(700, 700); popupLabel.setAlignment(Qt::AlignCenter); popupLabel.setStyleSheet("background-color: white; border: 1px solid black;"); popupLabel.setWindowFlags(Qt::Popup); popupLabel. setAttribute(Qt::WA_AcceptTouchEvents); QObject::connect(&popupButton, &QPushButton::clicked, [&popupLabel]() { popupLabel.show(); }); parent.show(); return app.exec(); }