onDestruction is never called in the QML component

[XiaoGuo, Liu]

I have created a very simple application, and I want to capture the onDestruction event. However, it is never called on a phone, but it is called on the desktop. On the page, http://developer.ubuntu.com/api/apps/qml/sdk-15.04/Qt.labs.settings.Settings/, it is used to save the state of the application.

  Page {
        title: i18n.tr("ondestruction")

        Column {
            spacing: units.gu(1)
            anchors {
                margins: units.gu(2)
                fill: parent
            }

            Label {
                id: label
                objectName: "label"

                text: i18n.tr("Hello..")
            }

            Button {
                objectName: "button"
                width: parent.width

                text: i18n.tr("Tap me!")

                onClicked: {
                    label.text = i18n.tr("..world!")
                }
            }
        }

        Component.onDestruction: {
            console.log("ondestruction")
        }
    }

[Zsombor Egri (zsombi)]

Could you be more specific? Like in what context the Page is used? Is it declared inside a PageStack? or in a separate document? Are you trying to use it in a PageStack?

[XiaoGuo, Liu (liu-xiao-guo)]

Can you take a look at the code I showed above? it is in the mainview. Please find the code at:

bzr branch lp:~liu-xiao-guo/debiantrial/ondestruction

On the setting page, it is used as an example for saving the state. If I understand correctly, it should be called like "Component.onCompleted" event for each of the component.

Thanks & best regards,
XiaoGuo

[Launchpad Janitor (janitor)]

[Expired for ubuntu-ui-toolkit (Ubuntu) because there has been no activity for 60 days.]

[XiaoGuo, Liu (liu-xiao-guo)]

This needs to be fixed

[Zsombor Egri (zsombi)]

In your example, the Page is declared as an instance. When you close the application, the elements will be destroyed silently, without having their attached Component.onDestruction called.

When you use a Page declared in the way you reported in a PageStack or AdaptivePageLayout, the Page will not be destroyed by these components as it has not been created by the PageStack/AdaptivePagelayout. So you won't get the onDestruction triggered either. In order to have that coming, you need to declare your page as component and add that to the PageStack/AdaptivePageLayout, or in a separate QML document and use that.

[XiaoGuo, Liu (liu-xiao-guo)]

But the same code on desktop has the output.