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[Databinding] Problem with listener of AggregateValidationStatus [message #334738]

Wed, 25 February 2009 18:14

Ravi

Messages: 8
Registered: July 2009

Junior Member

Hi,

I have a form with 6 fields that are bound using DataBindingContext. I
have a AggregateValidationStatus for the bindings with strategy as
MAX_SEVERITY. A listener has been attached to the
AggregateValidationStatus as below:-
IObservableValue status = new
AggregateValidationStatus(dataBindingContext.getBindings(),
AggregateValidationStatus.MAX_SEVERITY);
status.addValueChangeListener(new IValueChangeListener() {
public void handleValueChange(ValueChangeEvent event) {
// do something
}
});

When any of the text fields is modified, I need a callback to
handleValueChange method. Any thoughts?

I read through an earlier discussion. The solution suggested is to use
getValue() on the AggregateValidationStatus inside the listener. How do I
get a call to the listener everytime the text is modified?
http://dev.eclipse.org/newslists/news.eclipse.platform/msg80 116.html

Thanks,
Ravi

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Re: [Databinding] Problem with listener of AggregateValidationStatus [message #334742 is a reply to message #334738]

Wed, 25 February 2009 19:28

Matthew Hall

Messages: 368
Registered: July 2009

Senior Member

Your AggregateValidationStatus will not necessarily change every time
one of the text fields is updated, since intermediate values may have
the same validation status (IStatus.OK) and in these situations no
change event would be fired.

You need to add listeners directly on your target IObservableValues
rather than on an AggregateValidationStatus.

Matthew

Ravi wrote:
> Hi,
>
> I have a form with 6 fields that are bound using DataBindingContext. I
> have a AggregateValidationStatus for the bindings with strategy as
> MAX_SEVERITY. A listener has been attached to the
> AggregateValidationStatus as below:-
> IObservableValue status = new
> AggregateValidationStatus(dataBindingContext.getBindings(),
> AggregateValidationStatus.MAX_SEVERITY);
> status.addValueChangeListener(new IValueChangeListener() { public void
> handleValueChange(ValueChangeEvent event) {
> // do something
> }
> });
>
> When any of the text fields is modified, I need a callback to
> handleValueChange method. Any thoughts?
>
> I read through an earlier discussion. The solution suggested is to use
> getValue() on the AggregateValidationStatus inside the listener. How do
> I get a call to the listener everytime the text is modified?
> http://dev.eclipse.org/newslists/news.eclipse.platform/msg80 116.html
>
> Thanks,
> Ravi
>

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Re: [Databinding] Problem with listener of AggregateValidationStatus [message #334772 is a reply to message #334742]

Thu, 26 February 2009 17:56

Ravi

Messages: 8
Registered: July 2009

Junior Member

Thanks for the quick response, Matthew.

To capture the event, I am adding the listeners on the target observable.

Ravi

Matthew Hall wrote:

> Your AggregateValidationStatus will not necessarily change every time
> one of the text fields is updated, since intermediate values may have
> the same validation status (IStatus.OK) and in these situations no
> change event would be fired.

> You need to add listeners directly on your target IObservableValues
> rather than on an AggregateValidationStatus.

> Matthew

> Ravi wrote:
>> Hi,
>>
>> I have a form with 6 fields that are bound using DataBindingContext. I
>> have a AggregateValidationStatus for the bindings with strategy as
>> MAX_SEVERITY. A listener has been attached to the
>> AggregateValidationStatus as below:-
>> IObservableValue status = new
>> AggregateValidationStatus(dataBindingContext.getBindings(),
>> AggregateValidationStatus.MAX_SEVERITY);
>> status.addValueChangeListener(new IValueChangeListener() { public void
>> handleValueChange(ValueChangeEvent event) {
>> // do something
>> }
>> });
>>
>> When any of the text fields is modified, I need a callback to
>> handleValueChange method. Any thoughts?
>>
>> I read through an earlier discussion. The solution suggested is to use
>> getValue() on the AggregateValidationStatus inside the listener. How do
>> I get a call to the listener everytime the text is modified?
>> http://dev.eclipse.org/newslists/news.eclipse.platform/msg80 116.html
>>
>> Thanks,
>> Ravi
>>

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