Scroll list add/remove

[apll]

Hi everyone,

i would remove or add a object in a scroll list

I try to use

paramScroll.remove(*paramScrollListItems.getDrawable(0));
paramScroll.add(*paramScrollListItems.getDrawable(5));

but it don't work.

paramScrollListItems is a DrawableListItems.

How can i do this function in a scroll list?

[Martin KJELDSEN]

Hi @Community member​,

Have you read this article on Scroll List? https://touchgfx.zendesk.com/hc/en-us/articles/360018095032-Scroll-List

/Martin

[apll]

Yes, i read.

So if i want remove/add an object i must use the callback is invoked when an item has been clicked?

[Martin KJELDSEN]

The way the callbacks work is allow you to select the next item to add/delete during scroll - This allows us to not allocate all items required for a list but only the visible ones.

[apll]

This is max number of object in my list

paramScroll.setNumberOfItems(11);

instead this is the function linked with item -> updateItemCallback

paramScroll.setDrawables(paramScrollListItems, updateItemCallback);

i override updateItemCallback that it is called every time change sometime but i don't understand how i can add/remove object...

Can you write an example?

[Martin KJELDSEN]

Hi @Community member​,

Please check out the ScrollableList and Wheel example from within the designer. You'll see examples of how to set the update-item-callbacks in the baseclass and how to go about their implementation.

Hope that helps,

Martin

[apll]

Hi Martin,

i understand how set attribute of item but i don't know how remove or add item from scrollList

void InkjetMenuView::paramScrollUpdateItem(RecordInkject& item, int16_t itemIndex)
{
    switch (itemIndex)
    {
		case 0:
		{
			item.updateTextParam(T_PVFIRE);
			item.updateTextValue(IPLINK_HeadData[headShow].vFire);
			item.setId(0);
			break;
		}
...

i try to use

paramScroll.remove(item);

inside a function of scrollList but it doesn't work...

[Martin KJELDSEN]

Hi again,

Just to be completely sure about what you're trying to do, could you visualize it? Drawing or otherwise. What's working for you and what isn't. Screenshots of your running application - What're you expecting? Thanks!

/Martin

[apll]

This is my screen

If i use

if(itemIndex == 0)
     paramScroll.remove(item);

I expecting that first line delete and i see scroll list without first object

so what do i wrong?

Thanks for help me.

[Martin KJELDSEN]

Thanks. But what is the application doing when

if(itemIndex == 0)
     paramScroll.remove(item);

.. is executed? You're scrolling?