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Java Development

New Developer
Posts: 40
Registered: ‎05-12-2009
My Device: Not Specified

field.updateLayout cause scroll to top

When i call field.updateLayout the page will scroll to top but i just want it remain same position. How to do that?
Posts: 1,477
Registered: ‎12-30-2008
My Device: Torch 9810

Re: field.updateLayout cause scroll to top

This happens as expected, when you update a layout it is common for the screen to go to the start.. To work around this to get your expected results, find which field has the focus currently(before calling update layout), and then setFocus to that field after the update layout..



Manimaran Selvan
Co-Founder, Tech Lead,
Equity Markets Research Group
New Contributor
Posts: 6
Registered: ‎05-08-2012
My Device: BB 9800

Re: field.updateLayout cause scroll to top



i am trying to scroll verticalfield to a specific point(height) and make the field show on top of the page by calling setVerticalScroll() witin the layout method of the field:


protected void layout(int width, int height) {
_setExtent(getPreferredWidth(), getPreferredHeight());
// To try to scroll the list so that the focus field is shown on top of the page
if (this.getIndex() == this.getManager().getField(this.getManager().getFieldCount()-1).getIndex()) {



but the field doesnt scroll to the position. it however scrolls to the visible rect of the screen since the field's focus is true.


Can you please tell why the is not working... 



Posts: 2,268
Registered: ‎07-08-2009
My Device: various

Re: field.updateLayout cause scroll to top

One of the absolute first things to do in such cases is to wrap your setVerticalScroll in invokeLater. Calculate the position into a final int and invokeLater the setVerticalScroll call.


The reason is simple - since you don't know in what order the BB framework invokes fields' methods, you want to make sure your setVerticalScroll runs after the UI engine has completely finished the layout update.


See if that helps.

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New Contributor
Posts: 6
Registered: ‎05-08-2012
My Device: BB 9800

Re: field.updateLayout cause scroll to top

@arkadyz  : 

thanks a lot for you reply. will try this out.