[Interest] QML: Strange "binding loop detected" message

[Alexander Dyagilev]

OK, I've just refactoring it in this way and the problem is solved now. 
It's sad that it's impossible to use self-variable in the binding 
without getting boring warnings...

propertyintspeedColumnHoveredWidth:0

onCurrentTimeChanged:updateSpeedColumnHoveredWidth()

onDownloadsViewSpeedColumnHoveredChanged:updateSpeedColumnHoveredWidth()

onDownloadsViewSpeedColumnHoveredWidthChanged:updateSpeedColumnHoveredWidth()

onDownloadsViewSpeedColumnNotHoveredSinceTimeChanged:updateSpeedColumnHoveredWidth()

functionupdateSpeedColumnHoveredWidth()

{

//keephoveredwidthatmaxrecentvalue+3secondsafterleavinghoveredstate

varw=downloadsViewSpeedColumnHovered?

Math.max(d.speedColumnHoveredWidth,downloadsViewSpeedColumnHoveredWidth):

(d.currentTime-downloadsViewSpeedColumnNotHoveredSinceTime<3000)?d.speedColumnHoveredWidth:

0;

if(w!=d.speedColumnHoveredWidth)

d.speedColumnHoveredWidth=w;

}

On 4/2/2021 8:53 AM, Alexander Dyagilev wrote:
>
> Hello,
>
> I have a table. I change one column's size when user hovers it. Each 
> row in this column can require different "hovered" width. And I would 
> like it to return back in 3 seconds after mouse pointer left it.
>
> So, I use this:
>
> property bool viewSpeedColumnHovered: false
> property int  viewSpeedColumnHoveredWidth: 0
> property double viewSpeedColumnNotHoveredSinceTime: 0
>
> These properties are set outside of my control and the question is not 
> about them.
>
> To achieve the above I use this property:
>
> //keephoveredwidthatmaxrecentvalue+3secondsafterleavinghoveredstate
> property int speedColumnHoveredWidth: downloadsViewSpeedColumnHovered ?
> Math.max(speedColumnHoveredWidth, viewSpeedColumnHoveredWidth) :
>                                               (currentTime - 
> viewSpeedColumnNotHoveredSinceTime < 3000) ? speedColumnHoveredWidth :
>                                               0
>
> When I hover the column first time - all is OK. But after 3 seconds 
> has passed, it returns to 0. My column became normal again. Then I 
> hover it again and get this strange message:
>
> QML ViewHeaderColumnsWidthCalc: Binding loop detected for property 
> "speedColumnHoveredWidth"
>
> I can't understand how can this be... If Math.max returns the property 
> itself (speedColumnHoveredWidth), then it should not generate 
> "changed" signal (property remains the same).
>
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