On Thursday, March 24, 2011 9:21:00 PM UTC+1, Potate wrote:
>
> Hi everyone
>
> I'm having trouble understanding Editors introduced in GWT 2.1. It
> sounds like a nice feature to reduce boilerplate code. The Dev Guide
> is very very useful, but I couldn't get all the answers >_<
>
> ==========
>
> my first question is about validation and error reporting.
> take the Dev Guide example,
>
> public class PersonEditor extends Dialog implements Editor<Person> {
> Label nameEditor;
> ...
> }
>
> I wish to detect bad names, create a visual feedback upon error, and
> bubble this information up so the caller knows not to proceed further.
> I see there is recordError in EditorDelegate. Is it the right method
> to tackle this? Can I get an example please?
Yes, have a look at the DynatableRf sample and its ZipPlusFourBox widget.
It extends ValueBox, so actually, have a look at the ValueBoxEditor adapter
from GWT.
> I have a lot fields to
> edit. I hope I don't have to create bunch delegates. The less code the
> better =)
>
The delegate is provided to you by the editor framework, you have to
implement HasEditorDelegate.
> ==============
>
> second question is about "Q: How can I edit objects with a large
> number of properties?" from the FAQ section
> It has the following example
> class BagOfStateBiographicalEditor implements Editor<BagOfState> {
> AddressEditor address;
> Label name;
> }
>
> class BagOfStateUserPreferencesEditor implements Editor<BagOfState> {
> CheckBox likesCats;
> CheckBox likesDogs;
> }
>
> How do I chain up the two editors? Should I use a CompositeEditor? or
> a list of drivers?
What do you mean by "chaining them"? à la wizard? then either you use them
as they do in the example and just adjust their visibility (use a DeckPanel
or TabPanel/TabLayoutPanel?), or you use 2 drivers. I think you don't
generally need 2 drivers; and you don't need a CompositeEditor here,
CompositeEditor is for editing an object that's composed of zero or more
other objects (zero or one => OptionalEditor, a List<> of objects =>
ListEditor)
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