Maintain Up-Down Key with RowList

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I’m trying with this example ZipFileName: SimpleRowList.zip for RowList.

I’m trying with change itemcontent using the up-down key. For maintaining a Focus, other nodes like PosterGrid used itemfocused is type is an integer, and RowList used rowItemFocused is type is an array. So, It’s difficult to maintain itemcontent with RowList.

I applied logic for PosterGrid and successfully maintain an up-down key using the below logic.

nTotalItem = m.postergrid.content.getChildCount()
if key = "up"
    if m.postergrid.itemFocused = 0 then
       m.postergrid.jumpToItem = nTotalItem - 1
       ? "arrow selected "
    else
       m.postergrid.jumpToItem = m.postergrid.itemFocused - 1
       ? "arrow selected "
    end if
end if
if key = "down"
    if m.postergrid.itemFocused = nTotalItem - 1 then
       m.postergrid.jumpToItem = 0
       ? "arrow selected "
    else
       m.postergrid.jumpToItem = m.postergrid.itemFocused + 1
       ? "arrow selected "
    end if
end if

I tried with the same in RowList. But, It’s difficult to maintain. Because Here data represent in a two-dimensional array.

For understanding my RowList is like below as I mention number.

0 1 2 3
0 1 2
0 1
0 1 2 
0 1

Here, I have tried to manage the first-row first index to last row last index. Here I tried with below logic. But It’s only managed with a single column.

if key = "up"
    m.grid.content.GetChild(m.itemSelected[0] + 1).GetChild(m.itemSelected[1])
    ? "arrow selected "
else if key = "down"
    m.grid.content.GetChild(m.itemSelected[0] - 1).GetChild(m.itemSelected[1])
    ? "arrow selected "
end if

I know RowList is maintaining focus Automatically. But I tried to change using the up-down key. Anyone knows how to handle and maintain data using the up-down key.