ScrollList can only host 6 items?

[RReta.1]

version: touchGFX Designer 4.16.1

I generated a ScrollList to contain 8 items

In the .touchGFX project (attached) I can see the expected lines

"Type": "ScrollList",
"PaddingBefore": 0,
"PaddingAfter": 0,
"Snapping": false,
"IsHorizontal": false,
"IsCircular": false,
"ItemTemplateName": "lightSliderGroup",
"NumberofItems": 8,

However in the base class of the generated code I see this:

touchgfx::ScrollList lightGroupList;
touchgfx::DrawableListItems<lightSliderGroup, 6> lightGroupListListItems;

The odd thing is that 8 items actually got created, however in my case the slider value of the last 2 items always follow the value of the first 2 items in the list?

Hacking that line to change it from 6 to 8 does not fix the issue either.

Am I missing something or is this a bug? If so, is there any workaround?

[MM..1 · Accepted solution]

Items count in memory is based on viewed on screen count + 2 for scrolling. NumberofItems can be 100 or changing on the fly...

[RReta.1]

Thanks MM!

For everyone else, adding tracer prints around the ListUpdateItem in your view helps clarify the comment. In my case, the scroll list starts with 8 items, but only 4 is visible on the screen at a given time, which is why the `getNumberOfDrawables` is set to 6 (4+2) in my case.

As for the slider values being odd in my question, it was a case of uninitialized slider bar values. Once I do initialize them to known values, all is good.