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ObservableValueEditingSupport sets model value 1st time even if not changed [message #22595]

Wed, 22 July 2009 09:05

Eclipse User

I have been using the ObservableValueEditingSupport for various cell
editors and have noticed that if you click in a cell (eg to show a
TextCellEditor) and then click out of it (without changing its value) the
model is updated regardless.

Within ValueBinding there is a targetChangeListener which attempts to
prevent this by checking if the old and new values are the same. The first
time the cell editor binding is used however, the cell editors 'old' value
is empty, it thinks its current value and old value are different, so the
model is updated with the value it already has.

Property binding used elsewhere doesn't do this.

This becomes apparent more so if using EMF property binding with a
commandstack as the command stack becomes dirty yet the model values have
not actually changed.

Re: ObservableValueEditingSupport sets model value 1st time even if not changed [message #23114 is a reply to message #22595]

Wed, 22 July 2009 17:13

Eclipse User

Would you file a bug against Platform/UI for this?

Matthew

Matt Biggs wrote:
> I have been using the ObservableValueEditingSupport for various cell
> editors and have noticed that if you click in a cell (eg to show a
> TextCellEditor) and then click out of it (without changing its value)
> the model is updated regardless.
> Within ValueBinding there is a targetChangeListener which attempts to
> prevent this by checking if the old and new values are the same. The
> first time the cell editor binding is used however, the cell editors
> 'old' value is empty, it thinks its current value and old value are
> different, so the model is updated with the value it already has.
> Property binding used elsewhere doesn't do this.
> This becomes apparent more so if using EMF property binding with a
> commandstack as the command stack becomes dirty yet the model values
> have not actually changed.
>

Re: ObservableValueEditingSupport sets model value 1st time even if not changed [message #23408 is a reply to message #23114]

Thu, 23 July 2009 01:56

Eclipse User

Filed bug 284366

cheers

Matthew Hall wrote:
> Would you file a bug against Platform/UI for this?
>
> Matthew
>
> Matt Biggs wrote:
>> I have been using the ObservableValueEditingSupport for various cell
>> editors and have noticed that if you click in a cell (eg to show a
>> TextCellEditor) and then click out of it (without changing its value)
>> the model is updated regardless.
>> Within ValueBinding there is a targetChangeListener which attempts to
>> prevent this by checking if the old and new values are the same. The
>> first time the cell editor binding is used however, the cell editors
>> 'old' value is empty, it thinks its current value and old value are
>> different, so the model is updated with the value it already has.
>> Property binding used elsewhere doesn't do this.
>> This becomes apparent more so if using EMF property binding with a
>> commandstack as the command stack becomes dirty yet the model values
>> have not actually changed.
>>

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