Android Question Panel (ViewGroup) AddView Index

Slacker · Mar 14, 2014

Hello Folks. I'm using HorizontalScrollView to add and remove dinamically its items (on its inner panel) by code. I felt the need to make some items shifting dinamically keeping an internal reference on index position; i other words, i need to add item AT SPECIFIC INDEX, making the other items to shift as expected. AddView() method does not allow to specificy and index... but the ViewGroup view in the underlying Android world has an overload which allow to do it. It should be great having "AddViewAt()" method to giving more freedom to use.

Now, is there some workaround to control the indexes ? BringToFront() and SendToBack() move the items down and up, but is pretty limited.

Could give me some good suggestions ? My code could be great if i could add items at specific index. I could use Reflector calling AddView() with the overload i need, but i'm afraid this could confuse the underlying panel code logic.

Thank you !

derez · Mar 15, 2014

You can manage the order of the views in a list, add views to the list using list.insertat and then send all the views from that position to the back.
Something like this:

B4X:

Sub AddViewAt(parent As Panel, new As View, Index As Int)
    lst.InsertAt(Index,new)
    panel1.addview(new,10%x * Index, 15%y ,20%x,10%y)
    Dim v As View
    For i = Index To lst.Size - 1
        v = lst.Get(i)
        v.Left = 10%x * i
        v.SendToBack
    Next
End Sub

Slacker · Mar 15, 2014

Perfect, that's what i'm looking for... great Derez !

davepamn · Feb 25, 2015

derez said:
You can manage the order of the views in a list, add views to the list using list.insertat and then send all the views from that position to the back.
Something like this:

B4X:

Sub AddViewAt(parent As Panel, new As View, Index As Int) lst.InsertAt(Index,new) panel1.addview(new,10%x * Index, 15%y ,20%x,10%y) Dim v As View For i = Index To lst.Size - 1 v = lst.Get(i) v.Left = 10%x * i v.SendToBack Next End Sub

What is the data type of lst? How was it declared

DonManfred · Feb 25, 2015

I believe it is a LIST

derez · Feb 25, 2015

Yes

using list.insertat

Android Question Panel (ViewGroup) AddView Index

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