Eclipse Community Forums: JFace » [DataBinding] Delay model updates until dialog confirmation

Help

Home

Home » Eclipse Projects » JFace » [DataBinding] Delay model updates until dialog confirmation

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

[DataBinding] Delay model updates until dialog confirmation [message #551526]

Fri, 06 August 2010 20:05

Marian Seitner

Messages: 5
Registered: August 2010

Junior Member

I have a TitleAreaDialog with default buttons where I use data binding to synchronize the model and the widgets. How do I delay model updates until the user clicks the 'OK' button?

Thanks!

Report message to a moderator

Re: [DataBinding] Delay model updates until dialog confirmation [message #552417 is a reply to message #551526]

Thu, 12 August 2010 07:41

Matthew Hall

Messages: 368
Registered: July 2009

Senior Member

On 08/06/2010 02:05 PM, marian.seitner@googlemail.com wrote:
> I have a TitleAreaDialog with default buttons where I use data binding
> to synchronize the model and the widgets. How do I delay model updates
> until the user clicks the 'OK' button?
>
> Thanks!

Typically you do this by specifying POLICY_CONVERT as the
target-to-model update policy:

UpdateValueStrategy targetToModel = new UpdateValueStrategy(
UpdateValueStrategy.POLICY_CONVERT);
UpdateValueStrategy modelToTarget = new UpdateValueStrategy();

bindingContext.bindValue(target, model, targetToModel, modelToTarget);

The POLICY_CONVERT policy will execute the target-to-model bindings
whenever the target observables change, but stop short of actually
writing the values to model. However this generally includes enough of
the binding pipeline so that your validations can run and keep your
validation alerts current in your TitleAreaDialog.

When the user clicks finish, do this:

bindingContext.updateModels();

This explicitly runs all the target-to-model bindings all the way through.

Hope this helps,

Matthew

Report message to a moderator