MouseArea stuck in pressed state

[nx7z]

Hi,

I stumbled on a problem with the MouseArea on a Touchscreen: If you hold the MouseArea pressed while setting the visibility of the Area (or a parent) to false the MouseArea won't work anylonger (even when visible again) and any press or click is ignored, even with the mouse.

I made an little example, use it like this:

1. Touch and release the orange Rectangle.
2. Then quickly touch and hold the touch till the orange Rectangle is no longer visible.
3. Release.
4. The Rectangle now will toggle every 3secs visibility.
5. But even when the "brokenMouseArea" is visible, it won't accept any new clicks or touch events. All clicks of the orange Rect are now handle by the "fallbackMouseArea". Which is wrong.

import QtQuick 2.5
import QtQuick.Window 2.0

Window {
    visible: true
    width: 640
    height: 480

    MouseArea {
        id: fallbackMouseArea
        anchors.fill: parent
        onPressedChanged: console.log("fallbackMouseArea - pressed: " + pressed );
    }

    Rectangle {
        id: rect
        width: 100
        height: 100
        anchors.centerIn: parent
        color: "orange"
        MouseArea {
            id: brokenMouseArea
            anchors.fill: parent
            onClicked: timer.running = !timer.running
            onPressedChanged: console.log("brokenMouseArea - pressed: " + pressed );
        }
    }

    Timer {
        id: timer
        interval: 3000
        repeat: true
        onTriggered: rect.visible = !rect.visible
        onRunningChanged: console.log("running: " + running );
    }
}

Logging results using the Mouse:
qml: brokenMouseArea - pressed: true
qml: brokenMouseArea - pressed: false
qml: running: true
qml: brokenMouseArea - pressed: true
qml: brokenMouseArea - pressed: false
qml: brokenMouseArea - pressed: true
qml: brokenMouseArea - pressed: false
qml: running: false

Note: The MouseArea pressed state is set to false when visibility is changed to false which is correct behaviour.

Logging results using a Touchmonitor:
qml: brokenMouseArea - pressed: true
qml: brokenMouseArea - pressed: false
qml: running: true
qml: brokenMouseArea - pressed: true
qml: fallbackMouseArea - pressed: true
qml: fallbackMouseArea - pressed: false
qml: fallbackMouseArea - pressed: true
qml: fallbackMouseArea - pressed: false
qml: fallbackMouseArea - pressed: true
qml: fallbackMouseArea - pressed: false
qml: fallbackMouseArea - pressed: true
qml: fallbackMouseArea - pressed: false

Note: "qml: brokenMouseArea - pressed: false" is missing. The MouseArea is stuck in "pressed = true" and won't go back to pressed = false

[jpnurmi]

Are you using Qt 5.8.0? I recall such bug. It was probably fixed by https://codereview.qt-project.org/#/c/186452/ so the fix would be available in Qt 5.9.0. You can already test with the lastest Qt 5.9 beta available in the online installer.

[nx7z]

Thanks for your input jpnurmi!

Yes I'm using 5.8 and 5.9 beta is fixing this issue! Thanks for pointing it out! For some reason I didn't find this bug!

Best,
nx