Signal handler onAnchorsChanged is throwing error.

Nitheesh

When the following code is ran, qml is throwing loading error.

import QtQuick 2.6
import QtQuick.Window 2.2
import QtQuick.Controls 1.0

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("App1")

    Item {
        id: panel
        anchors.verticalCenter: parent.verticalCenter
        visible: true
        width: 100

        onAnchorsChanged: console.log("anchors changed")
    }
}

i am seeing error message as : qrc:/main.qml:17 Cannot assign to non-existent property "onAnchorsChanged" .
What is causing the error? i was just curious whether this has any special use case or not.

Thanks in advance.

raven-worx

@Nitheesh
anchors is a grouped property which never changes, thus it has no notify signal and also no corresponding slot.
Only the properties of the anchors object change.

So you rather need to do anchors.onCerticalCenterChanged: { ... }

Nitheesh

@raven-worx Thank u. Could you please explain why the anchors doesn't change? Does this mean that other properties for eg: onWidthChanged changes ?

dheerendra

As @raven-worx already told, anchors is grouped property. It just a wrapper to group related properties. What changes here is the property which is inside the grouped property. e.g anchors.top, anchors.bottom etc will change you need to handle property change of these. anchors.onTopChange().. anchors.onBottomChanged()..

dheerendra

@Nitheesh If the issue is resolved, move the issue to SOLVED state.