[Qt-qml] ListView and visible items

[Adriano Rezende]

On Thu, Feb 3, 2011 at 5:58 PM, Juha Turunen <turunen at iki.fi> wrote:
> On Thu, Feb 3, 2011 at 5:39 PM,  <jaakko.korpela at nokia.com> wrote:
> delegates should get an insideListViewBounds attached property or
> something (don't know though what the overhead is for cases where it's
> not needed).

I agree. This attached property would be useful and shouldn't impact
in performance if not used.

> If you take into consideration what Adriano said about the coordinates
> you should be able to simplify the logic a bit. Also wouldn't it be
> simpler to organize the logic so that you're checking for
> non-visibility rather than visibility? I mean check that the delegate
> y + height is less than contentY or delegate y is more than the
> content bottom and then do a ! in the onChanged handler.

In deed, it could be simplified to this:

Rectangle {
    color: isOutBoundaries ? "blue" : "red"

    property bool isOutBoundaries : (y > ListView.view.contentBottom ||
                                                    y + height <
ListView.view.contentY)
}

Br,
Adriano