Java Development

[jimmy6]

When i call field.updateLayout the page will scroll to top but i just want it remain same position. How to do that?

[mantaker]

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..

Cheers.. 

[optimus_prime]

hi,

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()) {
this.getManager().setVerticalScroll(this.getManager().getFieldWithFocus().getTop());

}
}

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... 

Thanks

[arkadyz]

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.

[optimus_prime]

@arkadyz  : 

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