[Interest] Resolving QML binding loops?

[Дмитрий Козлов]

08.01.2014 16:10, Cornelius Hald пишет:
> Hi,
>
> I was wondering if there are general patterns or best practices on how
> to omit/resolve QML binding loops.
>
> For example, the following code does what it should do, but while
> resizing the window I get a lot of warnings about the binding loop.
>
> Rectangle {
>      property double ratio: width / height
>      width: 600
>      height: 300
>      color: "gray"
>
>      // Rectangle with a fixed aspect ratio centered in parent
>      Rectangle {
>          property double ratio: 1.6
>          color: "red"
>          height: parent.ratio < ratio ? width / ratio : parent.height
>          width: parent.ratio > ratio ? height * ratio : parent.width
>          anchors.centerIn: parent
>      }
> }
>
> How do others solve issues like this?
>
> Cheers,
> Conny
>
>
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I don't know about best practises, but I found this solution:

Rectangle {
     property double ratio: width / height
     width: 600
     height: 300
     color: "gray"

     // Rectangle with a fixed aspect ratio centered in parent
     Rectangle {
         property double ratio: 1.6
         color: "red"
         width: parent.ratio < ratio ? parent.width : parent.height * ratio
         height: width / ratio
         anchors.centerIn: parent
     }
}