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| Re: multi-page form editor lazy construct [message #551345 is a reply to message #551311] |
Fri, 06 August 2010 05:02  |
 Prakash G.R.
Messages: 621
Registered: July 2009 |
Senior Member |
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On 06/08/10 2:56 AM, vlad crc wrote:
> I develop a RAP appl (I know this is a RCP forum, but I think this is
> the appropriate place to post this issue) and I created a multi-page
> form editor. In each page I have some Text, tables and other controls.
> On "doSave" I go through all the controls in all pages to get their
> values for further processing.
Ideally approach would have been to have a model and update the model
elements when there are changes in the associated UI elements. Finally
when you save, you should be persisting the model.
> Now here comes the issue: if a user only opens let's say the 1st and the
> 2nd page to modify something, and he doesn't open the 3rd and the other
> pages (which is a common use case), then, when I try to get the values
> of the controls in the 3rd page I get a null pointer exception, because
> the pages are constructed lazily and the controls on 3rd page does not
> exist.
A workaround is to show all the tabs before save (this has the side
effect of creating all the controls)
--
- Prakash
Platform UI Team, IBM
www.eclipse-tips.com
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