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Type: Bug
Resolution: Unresolved
Priority: P2: Important
Fix Version/s: None
Affects Version/s: 5.9.2
Component/s: Quick: Core Declarative QML
Labels:
None

Define OpacityAnimator with to property pointing to a new value. Start animation.

Expected result: Like NumberAnimation the animation plays from the current value to the new value.

Actual result: OpacityAnimator doesn't play animation unless you explicitly set something to the "OpacityAnimator.from" property. Didn't try out, but fear other Animators may face the same usability short-coming, and inconsistency with the traditional Animation elements.

import QtQuick 2.6

Rectangle {
    width: 300
    height: 300
    Rectangle {
        id: item
        color: "black"
        width: 100
        height: 100
        anchors.centerIn: parent
        NumberAnimation {
            target: item
            duration: 2000
            property: "opacity"
            to: 0.0 // Animates from implicit 1.0
            running: false
        }
        OpacityAnimator {
            target: item
            duration: 2000
            to: 0.0 // Doesn't animate from the initial opacity 1.0
            running: true
        }
   }
}