Home » Eclipse Projects » Eclipse Platform » [Databinding] Modifying properties of bindings in a TableViewer
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| Re: [Databinding] Modifying properties of bindings in a TableViewer [message #519491 is a reply to message #519429] |
Mon, 08 March 2010 20:40   |
 Anthony Juckel
Messages: 19
Registered: July 2009 |
Junior Member |
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Ideally, yes, that's what I want. But, if that functionality isn't
available, I was wondering if there's an easy way to bind a TableViewer
using just IObservableValues and a DataBindingContext. Perhaps I should
just take a peek at how difficult it would be to make a patch for #269728.
On 3/8/10 12:54 PM, Ovidio Mallo wrote:
> Hi Anthony,
>
> is the following bug what you're looking for?
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=269728
>
> Unfortunately, this functionality is not implemented yet...
>
> Kind regards,
> Ovidio
>
>
> Anthony Juckel wrote:
>> Most of the databinding documentation/examples I'm finding seem to
>> fall into one of two camps. The first involves binding observables to
>> single widgets via a DataBindingContext. The second involves using a
>> set of IObservableMaps and an ObservableListContentProvider, and
>> having all the databinding done rather automatically.
>>
>> Now, I'm binding a list of model objects to a TableViewer, but I'd
>> like to alter the default databinding to introduce a delay between
>> updates to the model and updates to the widgets. It's clear to me how
>> such would be handled if I were explicitly binding individual model
>> elements to individual GUI elements, but I'm unclear how to accomplish
>> the same via the ObservableListContentProvider route. I'm most likely
>> missing something obvious. Could anyone point me in the right direction?
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| Re: [Databinding] Modifying properties of bindings in a TableViewer [message #519781 is a reply to message #519491] |
Tue, 09 March 2010 23:11 |
Ovidio Mallo
Messages: 35
Registered: July 2009 |
Member |
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What exactly do you want to bind with a certain delay on the
TableViewer? Are you talking about the elements of the table or just the
selection? If you could write up a simple snippet illustrating your
problem, this might help.
Regards,
Ovidio
Anthony Juckel wrote:
> Ideally, yes, that's what I want. But, if that functionality isn't
> available, I was wondering if there's an easy way to bind a TableViewer
> using just IObservableValues and a DataBindingContext. Perhaps I should
> just take a peek at how difficult it would be to make a patch for #269728.
>
> On 3/8/10 12:54 PM, Ovidio Mallo wrote:
>> Hi Anthony,
>>
>> is the following bug what you're looking for?
>> https://bugs.eclipse.org/bugs/show_bug.cgi?id=269728
>>
>> Unfortunately, this functionality is not implemented yet...
>>
>> Kind regards,
>> Ovidio
>>
>>
>> Anthony Juckel wrote:
>>> Most of the databinding documentation/examples I'm finding seem to
>>> fall into one of two camps. The first involves binding observables to
>>> single widgets via a DataBindingContext. The second involves using a
>>> set of IObservableMaps and an ObservableListContentProvider, and
>>> having all the databinding done rather automatically.
>>>
>>> Now, I'm binding a list of model objects to a TableViewer, but I'd
>>> like to alter the default databinding to introduce a delay between
>>> updates to the model and updates to the widgets. It's clear to me how
>>> such would be handled if I were explicitly binding individual model
>>> elements to individual GUI elements, but I'm unclear how to accomplish
>>> the same via the ObservableListContentProvider route. I'm most likely
>>> missing something obvious. Could anyone point me in the right direction?
>
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| Re: [Databinding] Modifying properties of bindings in a TableViewer [message #519815 is a reply to message #519781] |
Wed, 10 March 2010 03:26 |
Anthony Juckel
Messages: 19
Registered: July 2009 |
Junior Member |
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I've pushed a sample up to github at
http://github.com/ajuckel/org.example.emfdb/ It builds off a previous
example, so don't put any effort into understanding the Addressbook
model. The essence of the problem is, I want to display a large
dataset, where some properties of the model may change very rapidly due
to external data. In my example, I've got ten threads, each updating a
value every 10-20 milliseconds. If you run the app, use the view menu
to populate the TableViewer, then use Bind Temps from the view menu to
start the simulated external data.
I cannot simply ignore the data on the model side (I need to acknowledge
every temperature update), but there's no use trying to update the GUI
as often as I get new temperature data. The UI can keep up with 100
Person objects in the table, but the values are completely illegible.
As a stop gap, I can just forego databinding for the rapidly changing
data, and just manually repaint the column(s) at a set interval, but I'd
rather be able to insert reasoning about how to handle updates between
the model and the widget painting. For instance, only update once a
second, but take the highest/lowest/average of the external data that's
arrived within that time frame.
On the other hand, perhaps I'm asking far too much from a general
purpose databinding framework. I could accomplish essentially the same
thing by not binding the UI directly to temperature, for instance, but
rather having something like the following:
Cell <-- SWT Realm --> Intermediate Object <-- Custom Realm --> Model
On 3/9/10 5:11 PM, Ovidio Mallo wrote:
> What exactly do you want to bind with a certain delay on the
> TableViewer? Are you talking about the elements of the table or just the
> selection? If you could write up a simple snippet illustrating your
> problem, this might help.
>
> Regards,
> Ovidio
>
>
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