updateLayout and invalid in the Manager

Hello.

When we should call it updateLayout() and invalidate()?

Especially if we want to chanage the position of a child, but not the size or content, where we do that, and what method above, we should call?

(Note: the above is happened to a custom handler)

Thank you very much

Know that what follows is just my opinion, based on my experience.  I did not review any documentation.

Invalidate() is an instruction to a screen, the Manager or the field to extricate himself.  All it will do is run again the paint method.  If you use this if you have a custom field where you substituted object.  You can call invalidate() when you changed some aspects of it (for example the background color).

If this do not rearrange the field, the screen, or the Manager.

If you use the standard fields, then you don't need to call invalidate().  They will control for themselves.

updateLayout() may be necessary when you change the size or shape or when you want to change the position of a field or a Manager.  You can call this method for the owner manager.  But you only will do that for your custom fields or managers, as all of the standard fields and managers know that they have to do this anyway.  Thus, for example, if you update the text of a LabelField, this will cause Manager of the LabelField to Redisposer the LabelField without needing any additional instructions.

If it does not respond to your question please ask again...

One last thing.  From my experience, you should avoid to relay out Manager where you have loads of fields displayed on a screen, because even if the phone did this, your application is blocked.  Users will think of you app is broken or lethargic.

Tags: BlackBerry Developers

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