[Development] Improving QtQuick internals (was Re: QML engine changes)

[Nils Jeisecke]

HI Alan,

see the following example for a real use case. I wouldn't say this is bad QML.

Destroying the loader's component will also destroy the component's
myTools row, although it has been reparented to another item. For this
use case it's just the right behavior but to be honest I've not yet
fully understood why. There must be a visual parent and an independent
ownership child list.

mail.qml
---

import QtQuick 2.0

Item {
  width: 400
  height: 400
  Row {
    id: toolContainer
  }
  Loader {
    id: loader
    anchors.top: toolContainer.bottom
    source: "DynamicallyLoadedComponent.qml"
  }
  MouseArea {
    anchors.fill: parent
    onClicked: loader.source = "" // click to destroy component instance
  }
}

DynamicallyLoadedComponent.qml
----

import QtQuick 2.0

Text {
  text: "Bla Bla"
  Row {
    id: myTools
    parent: toolContainer  // <<<<< reparented!
    Component.onDestruction: console.log("destroyed")
    Repeater {
      model: 5
      Text {
        text: "Tool " + modelData
      }
    }
  }
}

Nils