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Details

Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 6.2.7, 6.4.1, 6.5.0 Beta1
Affects Version/s: 5.15.2, 6.3.0 Beta1, 6.3.1, 6.4.0
Component/s: GUI: Wacom Tablet Input, Quick: Mouse Touch and Tablet input
Labels:
None
Environment:
Windows 11. Tested with Wacom graphics tablet and Samsung Galaxy Book

Platform/s:

Windows
Commits:
31e7790102 (qt/qtbase/dev) 31e7790102 (qt/tqtc-qtbase/dev) f35ad8f32f (qt/tqtc-qtbase/6.2) 97c95f606f (qt/qtbase/6.4) 97c95f606f (qt/tqtc-qtbase/6.4) 97c95f606f (qt/tqtc-qtbase/6.4.1) 97c95f606f (qt/tqtc-qtbase/tqtc/qtinsight-6.4)

Description

In the following code, we have a simple TapHandler that logs a message using the onTapped signal handler.

import QtQuick 2.15
import QtQuick.Window 2.15

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    TapHandler{
        id: tapHanlder
        acceptedDevices: PointerDevice.Stylus | PointerDevice.Pen
        onTapped: {
            console.debug("Clicked!", Date.now()) // this gets printed twice
        }
    }
}

When running this code and testing with a stylus (I've tested this with a graphic tablet and a Samsung S Pen on Windows 11), the TapHandler emits the signal twice so the console message gets printed twice. If on the other hand, the TapHandler is used with a mouse the code behaves as expected. This seems to be another bug affecting the Qt Quick tablet input system on Windows (I couldn't reproduce this bug on Linux), which is basically unusable and too buggy to be used in production (see QTBUG-98242 and QTBUG-98037).