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  1. Qt
  2. QTBUG-118197

Component completion inconsistencies

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    Description

      Given the following QML:

       

      import QtQuick

Rectangle {
    objectName: "0"

    Item {
        objectName: "1";
        Component.onCompleted: console.log("Component.onCompleted " + objectName)
    }
    Item {
        objectName: "2";
        Component.onCompleted: console.log("Component.onCompleted " + objectName)

        Item {
            objectName: "2.1";
            Component.onCompleted: console.log("Component.onCompleted " + objectName)
        }
        Item {
            objectName: "2.2";
            Component.onCompleted: console.log("Component.onCompleted " + objectName)
        }
    }
    Item {
        objectName: "3";
        Component.onCompleted: console.log("Component.onCompleted " + objectName)
    }

    Component.onCompleted: console.log("Component.onCompleted " + objectName)

      The order of QQmlParserStatus::componentComplete() and Component.onCompleted is inconsistent:

      QQuickItem::componentComplete QQuickItem(0x6000039d0d20, name="3", parent=0x6000039d5420, geometry=0,0 0x0)
QQuickItem::componentComplete QQuickItem(0x6000039c42a0, name="2.2", parent=0x6000039c4380, geometry=0,0 0x0)
QQuickItem::componentComplete QQuickItem(0x6000039dc380, name="2.1", parent=0x6000039c4380, geometry=0,0 0x0)
QQuickItem::componentComplete QQuickItem(0x6000039c4380, name="2", parent=0x6000039d5420, geometry=0,0 0x0)
QQuickItem::componentComplete QQuickItem(0x6000039d57a0, name="1", parent=0x6000039d5420, geometry=0,0 0x0)
QQuickItem::componentComplete QQuickRectangle(0x6000039d5420, name="0", parent=0x0, geometry=0,0 0x0)
Component.onCompleted 0
Component.onCompleted 3
Component.onCompleted 2
Component.onCompleted 2.2
Component.onCompleted 2.1
Component.onCompleted 1

      QQuickItem::componentComplete happens "inside out", with lead nodes completing before their parents, while Component.onCompleted happens "outside-in", with parents completed before their children.

      The order of completion within a single item for child items is also reversed, compared to the document order of the items.

      From what I understand, neither of these behaviors are documented or defined. It would be nice if we could make them consistent, and also follow the document order.

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          relates to

          Task - A task that needs to be done. QTBUG-98789 Simplify binding order in QmlIR

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported
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              qtqmlteam Qt Qml Team User
              vestbo Tor Arne Vestbø
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                Created:
                Updated:
                Resolved:

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