[Interest] Can QML model specify a range including negative numbers? For example -180 to +180 ?

[André Somers]

Op 6-11-2015 om 10:10 schreef Curtis Mitch:
>
> You can use the columnForeground component [1] for this purpose:
>
> import QtQuick 2.3
>
> import QtQuick.Controls 1.2
>
> import QtQuick.Extras 1.2
>
> import QtQuick.Controls.Styles 1.2
>
> ApplicationWindow {
>
>     visible: true
>
>     width: 640
>
>     height: 480
>
>     title: qsTr("Hello World")
>
>     Tumbler {
>
>         id: tumbler
>
> anchors.centerIn: parent
>
>         TumblerColumn {
>
>             model: 90
>
>         }
>
>         TumblerColumn {
>
>             model: 60
>
>         }
>
>         TumblerColumn {
>
>             model: 60
>
>         }
>
>         TumblerColumn {
>
>             model: ["N", "S"]
>
>         }
>
I don't think I would keep the N/S (or E/W) option in a separate column. 
Why not integrate that into the first column? You can easily use a 
delegate to on the column to display negative values as S or W depending 
on latitude or longitude. To stick to a standard notation, you would 
have to put the N/S/E/W first in the column, like S 17|33|08.

Using a delegate can also solve your model problem the whole thread 
started with. Just use a number again as the model, but only use the 
positive range from 0 to 360. Then in your delegate simply adjust the 
value from the model to the actual value you want to display.

André

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