Change anchors conditionally?

[pokemonsrqt]

I try to set anchors.right conditionally, but it does not work - it stays attached to startLine.left even as startsAtLowerBoundary changes. Why?

I think I have eliminated that the problem could be because of anything else

• I can see in the console logs that value is changed as expected.

• When I hard code anchors.right: undefined I can see that the layout is as I would expect.

  Rectangle {
    property bool startsAtLowerBoundary: ui.selectionModel.startsAtLowerBoundary
  
    onStartsAtLowerBoundaryChanged: {
      console.log(startsAtLowerBoundary)
    }
  
    anchors.right: startsAtLowerBoundary ? startLine.left : undefined
    ...
  }

[sierdzio]

It should work... perhaps after removing the anchor the item "just happens" to remain in the same place? I mean, QML engine has no reason to move it somewhere else because an anchor is only detached, and not attached somewhere else.

Another solution: use AnchorChanges, it would start working.

[pokemonsrqt]

Bingo!

Setting the anchor to undefined after having set a value previously does not produce the same result as setting anchor to undefined initially. I didn't consider that possibility.

Thanks for the help!