How do you detect activity on ListView ( others than 'AfterPicking' )?

[Andre_Castro]

Hi there,

I'm showing a list that are refreshed each 30s with an up-to-date data set.
However, depending on specific circumstances, the amount of entries may ome too big, and the user need to read the list too fast.

Unfortunatelly, the only event available on this Component is the 'AfterPicking', but I wanted to detect any event there, such as 'scrolling' the list.

One could suggest to just define a timeout proportional to the amount of data, but I wanted to detect the user activity on the screen.

Is there any clever way to do that ?

[ABG]

@Andre_Castro

I wanted to detect the user activity on the screen.

You could make your own ListView, as in

Go Scroll Yourself! blocks only (No extensions, No JavaScript)

This tutorial is intended for people who need to display a heavily customized scrollable window into a large table. It can also be used as a CardView. (I needed a pithy title, and "The Elder Scrolls" was taken.) My sample subject area for my data is the historical or current set of legislators in the US Congress, both Representatives and Senators, with photos (where available.) Credits for the source data: Data from https://github.com/unitedstates/congress-legislators photos from https://…

[TIMAI2]

There are scroll handler and recycler list extensions that may help you, though it is not entirely clear what your issue is.

[Andre_Castro]

Hi

@ABG ,

Thank you a lot for the tip, seems promising this approach, but I could see there only the btnUp and btnDown event, which sound as only 'clicking' events are sensed, instead of 'dragging' events.

With the current approach ( ListView ), we are able to chose the 'scrolling speed' depending on how fast we slip the finger on the screen upward/downward.

@TIMAI2 ,

Thank you, I will make a search on the scroll handler extensions, as you suggested ( btw, I thought there would have some 'Activity Starter' option to achieve the feature ). Perhaps the issue was not too clear for you because I did not mentioned that the whole list is sometimes dozens times the height of the screen itself, and the current list is periodically updated even when the user is calmly browsing its content, and after each update, the list 'pointer' returns to the beginning, having them to navigate again to the middle of the list.

[Ramon]

Hello,

you can use this extension:

ListViewPlus - additional methods for the ListView component

This extension adds several features to the built-in ListView component. Blocks v2: [blocks - 2023-05-26T191926.969] Description: AddClassicDividers: Add linear dividers in a classic ListView. [Screenshot_20230519-103058] DecorateItems: Set rounded corners and margins for each item in the list. The radius is the same for every corner. Margin can be set with an integer, then all margins will have the same value. We can also list four integer values in the order left, top, right, and bo…

You have a "Position" block which will give you the scroll position and then use the block "JumpTo(position)" to back to the same item.

[TIMAI2]

Just a thought, do items "further down the list" ever change or get updated? If not you could run a list of latest 25 items and a second list of older items ?

[ABG]

@Andre_Castro

but I could see there only the btnUp and btnDown event, which sound as only 'clicking' events are sensed, instead of 'dragging' events.

The dragging events are further down in my post: