Problem scrolling a scrollview to a position?

peve9 · May 14, 2013

Hi everyone!
We have tried this code to scroll a scrollview to a particular position, but we weren't able to do it:

B4X:

Private Sub soft_HeightChanged (NewHeight As Int, OldHeight As Int)
   'Msgbox("NEW: " & NewHeight & CRLF & "OLD: " & OldHeight,"")
   Dim dif As Int
   dif = Abs(NewHeight-OldHeight)
   If NewHeight<OldHeight Then
   
   
      'sv.SetLayout(sv.Left,sv.Top,sv.Width,sv.Height-dif)
      'DoEvents
      sv.Height=sv.Height-dif
      sendButton.Top=sendButton.Top-dif
      edit.Top=edit.Top-dif
      'JumpToItem(GetSize)
      Msgbox(dif,"")
      DoEvents
      sv.ScrollPosition=sv.ScrollPosition+dif
      DoEvents
      Log("pippi")
      sv.Invalidate
   Else
      sv.Height=sv.Height+dif
      sendButton.Top=sendButton.Top+dif
      edit.Top=edit.Top+dif
   End If
End Sub

sv.scrollposition doesn't work... why? It seems that sv.scrollview hasn't been executed! WHY????????? :sign0085::sign0085:

klaus · May 14, 2013

What height do you want to change ?
The sv.Height or the sv.Panel.Height ?

Best regards.

peve9 · May 14, 2013

The height is not the problem.. it works well.
The problem is the scrollposition

yttrium · May 14, 2013

peve9 said:
The height is not the problem.. it works well.
The problem is the scrollposition

Place a msgbox outside of the If statement and see if that appears.

klaus · May 14, 2013

Are you sure that the sv.Panel.Height has a correct value ?
Otherwise post a small project showing the problem.

Best regards.

Erel · May 15, 2013

As Klaus wrote you should first make sure that the position can actually be scrolled to.

You can try to use this reflection code:

B4X:

Private Sub ScrollTo(pos As Int)
   'sv.ScrollTo smoothly scrolls to the position. In this case we want to immediately change the scroll position
   'so we use Reflection to call the native scrollTo method.
   Dim r As Reflector
   r.Target = sv
   r.RunMethod3("scrollTo", 0, "java.lang.int", pos, "java.lang.int")
End Sub

Problem scrolling a scrollview to a position?

peve9

Member

klaus

Expert

peve9

Member

yttrium

Active Member

klaus

Expert

Erel

B4X founder

Similar Threads

Problem scrolling a scrollview to a position?

peve9

Member

klaus

Expert

peve9

Member

yttrium

Active Member

klaus

Expert

Erel

B4X founder

Similar Threads

Privacy & Transparency

Privacy & Transparency