Re: getAbsoluteTop() / getOffsetHeight() always return 0

On 1 juin, 13:59, cy dev <cydevelo...@gmail.com> wrote:
> i create a custom panel class which draws threads of messages inside.
> each message (several Labels) is wrapped in a FlowPanel.  the flow
> panels are added to a LayoutPanel which i intend to do some
> animation.  however, i failed to get neither the height nor the
> position of the flow panels
> through .getAbsoluteTop()/.getOffsetHeight().  they always return 0 so
> i cant arrange the positions of the flow panels.  may someone help to
> tell me how the position can be caught with the following codes?
>
> class MessageReply extends Composite {
>   private LayoutPanel lpanel = new LayoutPanel();
>
>   public MessageReply(){
>     initWidget(lReplyPanel);
>
>     FlowPanel fpanel = new FlowPanel();
>     fpanel.add(new Label("test message"));
>
>     lReplyPanel.add(fpanel);
>     int textHeight = fpanel.getOffsetHeight();  // i need this height
> to put the flow panel to correct position but it always return 0
>   }
> }

You MessageReply isn't yet attached to the document, so it has no size
yet. Try doing this in onLoad().

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