[Interest] Updating NumberAnimation from/to at runtime

[Jérôme Godbout]

so probably doing like Mark point out

*alwaysRunToEnd: false*
onToChanged: restart()

seem to work but very slowly, wonder if there's something better to be done
here, much more like a state animation.

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Jerome Godbout
Software Developer
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On Fri, Jul 14, 2017 at 9:54 AM, Mark Tucker <mark.tucker at airborne.aero>
wrote:

> From my experience, once started, you cannot dynamically change the
> parameters (such as from, to, duration) of an animation in such a way,
> without restarting the animation. Doing so simply has no effect on the
> already running animation.
>
>
>
> In other words, the values are taken as an assignment at the point at
> which it's started and will not change until the animation is restarted.
>
>
>
> -Mark
>
>
>
> *From:* Interest [mailto:interest-bounces+mark.tucker=airborne.aero at qt-
> project.org] *On Behalf Of *Kristoffersen, Even (NO14)
> *Sent:* 14 July 2017 14:00
> *To:* interest at qt-project.org
> *Subject:* Re: [Interest] Updating NumberAnimation from/to at runtime
>
>
>
> You can try to force binding with Qt.binding().
>
>
>
> -Even
>
>
>
> *From:* Interest [mailto:interest-bounces+even.
> kristoffersen=honeywell.com at qt-project.org
> <interest-bounces+even.kristoffersen=honeywell.com at qt-project.org>] *On
> Behalf Of *Shantanu Tushar
> *Sent:* 14. juli 2017 11:27
> *To:* interest at qt-project.org
> *Subject:* [Interest] Updating NumberAnimation from/to at runtime
>
>
>
> Hi,
>
> Consider the following code which draws two rectangles - a red rectangle
> which contains another blue rectangle.
>
> Rectangle {
>         id: r1
>         anchors.centerIn: parent
>         width: 300; height: 100
>         color: "red"
>
>         Rectangle {
>             id: r2
>             width: 100; height: 100
>             color: "blue"
>
>             NumberAnimation on x {
>                 loops: Animation.Infinite
>                 from: 0; to: r1.width-r2.width
>                 duration: 1000
>
>                 onToChanged: console.log(to)
>             }
>         }
>
>         NumberAnimation on width {
>             loops: Animation.Infinite
>             from: 300; to: 100
>             duration: 10000
>         }
>     }
>
> The blue rectangle is supposed to keep moving inside the red rectangle by
> means of a NumberAnimation. However, the width of the red rectangle changes
> according to another animation.
>
> I thought this will work fine and the blue rectangle will be confined to
> the red rectangle because of the following binding-
>
> to: r1.width-r2.width
>
> However, thats not what happens. The blue rectangle overflows the red
> rectangle, as if the binding never got updated. But, I can see that the
> `console.log(to)` does prove the binding is working.
>
> (Screenshot at http://i.imgur.com/yDTYbv9.png
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fi.imgur.com%2FyDTYbv9.png&data=02%7C01%7Ceven.kristoffersen%40honeywell.com%7C5b50a750b34e473ffd8708d4ca9a91e0%7C96ece5269c7d48b08daf8b93c90a5d18%7C0%7C0%7C636356212616706749&sdata=D17jHatSL1gf3XFPYQpAebB2e1H7T7nmzhLvi%2BPcB5g%3D&reserved=0>
> )
>
> Is this a limitation of NumberAnimation? Or am I using it wrong?
>
>
>
> --
>
> Shantanu Tushar    (UTC +0530)
> shantanu.io
> <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fshantanu.io&data=02%7C01%7Ceven.kristoffersen%40honeywell.com%7C5b50a750b34e473ffd8708d4ca9a91e0%7C96ece5269c7d48b08daf8b93c90a5d18%7C0%7C0%7C636356212616706749&sdata=E80rwaltPVsx1m%2FToEC8aIY1%2F9fwpeFCfxrLlThOxTs%3D&reserved=0>
>
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