Eclipse Community Forums: JFace » ObservableValueEditingSupport sets model value 1st time even if not changed

Help

Home

Home » Eclipse Projects » JFace » ObservableValueEditingSupport sets model value 1st time even if not changed

Show: Today's Messages :: Show Polls :: Message Navigator

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

Wed, 22 July 2009 13:05

Matt Biggs

Messages: 71
Registered: July 2009

Member

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.

Report message to a moderator

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

Wed, 22 July 2009 21:13

Matthew Hall

Messages: 368
Registered: July 2009

Senior Member

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.
>

Report message to a moderator

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

Thu, 23 July 2009 05:56

Matt Biggs

Messages: 71
Registered: July 2009

Member

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.
>>

Report message to a moderator

Previous Topic:	[CellEditor] Find the currently active CellEditor in a TableViewer (3.3 API)
Next Topic:	Changing foreground/background color of selected table row

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Fri Dec 27 00:22:46 GMT 2024

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter