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Details

Type: Bug
Resolution: Fixed
Priority: P2: Important
Fix Version/s: 6.2.10, 6.5.0, 6.5.1, 6.6.0
Affects Version/s: 6.2.7, 6.3.2, 6.4.1
Component/s: Quick: Mouse Touch and Tablet input
Labels:
None

Platform/s:

macOS
Commits:
7ef3bee4f (dev), b0541aa82 (6.5), 0e61fbf8d (6.5.0), ffddb966d (tqtc/lts-6.2)

Description

While investigating some strange bug with Handlers in my own app I've found strange bug in Qt - using PinchHandler for Flickable's child makes the Flickable's transparent for touch events. As soon as I can see this is regression at some point after 6.2.4.

Code sample:

import QtQuick

Window {
    width: 640
    height: 480
    visible: true

    TapHandler {
        onTapped: {
            color = Qt.rgba(Math.random(1), Math.random(1), Math.random(1), 1)
        }
    }

    Flickable {
        anchors.fill: parent
        contentWidth: content.width
        contentHeight: content.height
        Rectangle {
            id: content
            width: 200
            height: 200
            color: 'red'
            PinchHandler {}
        }
    }
}

See video Screen Recording 2022-11-25 at 23.06.26.mov

Steps to reproduce:

Pinch red rectangle few times
Click the left button several times, at some point all clicks will start to propagate to the underlying TapHandler (it changes the window's color when processing touches)

Reproduces at least on macOS with touchpad.