No way to handle comboBox popup visibility

[Nicola Peroni]

Hi all,

I would like to check the visibility of a QtQuick.Controls2 ComboBox popup but there doesn't seem to be any way to do this.

I would like the popup to remain visible as long as ComboBox has the activeFocus.
I tried starting from qt official guide - customizing combobox and by changing the popup closePolicy property to Popup.NoAutoClose, but it does not change anything and popup keeps closing when clicking outside!

Here is a little example

import QtQuick 2.9
import QtQuick.Window 2.2
import QtQuick.Controls 2.3

Window {
    visible: true
    width: 640
    height: 480

    ComboBox {
        id: control

        editable: true
        indicator: null

        model: ListModel {
            id: model

            ListElement { text: "Banana" }
            ListElement { text: "Apple" }
            ListElement { text: "Coconut" }
        }

        onActiveFocusChanged: {
            console.log("onActiveFocusChanged", activeFocus)
            if (activeFocus)
                popup.open()
            else
                popup.close() // Note: this is not called when clicking outside the ComboBox
        }

        popup: Popup {
            y: control.height - 1
            width: control.width
            implicitHeight: contentItem.implicitHeight
            padding: 1
            closePolicy: Popup.NoAutoClose // <---------- completely ignored!
            // visible: control.activeFocus // This should be a declarative way to be used instead of onActiveFocusChanged callback, but doesn't works!
            onVisibleChanged: console.log("visible changed to", visible, ", control activeFocus is", control.activeFocus) // log just to highlight the issue
            contentItem: ListView {
                clip: true
                implicitHeight: contentHeight
                model: control.popup.visible ? control.delegateModel : null
                currentIndex: control.highlightedIndex
                ScrollIndicator.vertical: ScrollIndicator { }
            }

            background: Rectangle {
                border.color: "#21be2b"
                radius: 2
            }
        }
    }
}

This is the application output:

when I click on the ComboBox:

qml: onActiveFocusChanged true
qml: visible changed to true , control activeFocus is true

when I click outside the Popup:

qml: visible changed to false , control activeFocus is true

Is this a bug or am I doing something wrong?
Thanks in advance

[ambershark]

I played around with it a lot. It feels kind of like a bug to me. It acted weird, like if it disappeared but I moved the window it would reappear. If I clicked outside the window it was fine but if I clicked the window background (i.e. outside the popup but inside the application) it would hide.

Seems like a bug, but I admit I'm not good with QML so maybe someone else can explain why that is happening. I would file a bug if you don't get an answer.