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How should I add validation to WindowBuilder-generated data binding? [message #893077]

Mon, 02 July 2012 13:52

Alexey Romanov

Messages: 263
Registered: May 2010

Senior Member

As far as I understand, to use JFace DataBinding validation, I need to use my own UpdateValueStrategy in dataBindingContext.bindValue(...) calls. But in case of WindowBuilder, these calls are made in generated initDataBinding() method which can't be edited by hand. So how should I do this?

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Re: How should I add validation to WindowBuilder-generated data binding? [message #893329 is a reply to message #893077]

Tue, 03 July 2012 14:48

Eric Clayberg

Messages: 979
Registered: July 2009
Location: Boston, MA

Senior Member

Are you saying that there is something you can't do using the provide Data Binding UI? You should provide a detailed example of what you are trying to do and illustrate why you think you need to modify the generated code.

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Re: How should I add validation to WindowBuilder-generated data binding? [message #893337 is a reply to message #893329]

Tue, 03 July 2012 15:23

Alexey Romanov

Messages: 263
Registered: May 2010

Senior Member

Let's take http://www.toedter.com/blog/?p=36 as an example. Note the call

dataBindingContext.bindValue(
    SWTObservables.observeText(firstNameText, SWT.Modify),
    PojoObservables.observeValue(person, "firstName"),
    new UpdateValueStrategy()
        .setAfterConvertValidator(new StringRequiredValidator(
             "Please enter first name",
              firstNameDecoration)),
    null);

where an UpdateValueStrategy is constructed manually.
So far as I've seen, UI only generates

new UpdateValueStrategy(UpdateValueStrategy.POLICY_XXX)

in initDataBindings() and doesn't let me customize it by setting validators or converters.

I also can't see a way to change the update strategy after the Binding is created in the API.

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Re: How should I add validation to WindowBuilder-generated data binding? [message #893367 is a reply to message #893337]

Tue, 03 July 2012 17:35

Eric Clayberg

Messages: 979
Registered: July 2009
Location: Boston, MA

Senior Member

Have you reviewed the WindowBuilder Data Binding docs? You can set validators and converters through the UI.

https://developers.google.com/java-dev-tools/wbpro/features/swt/data_binding/images/edit_binding_strategy_properties.gif

For anything too complex for the UI to handle, just write that code outside of the initDataBindings() method and have it run after initDataBindings() runs and the binding context has been created.

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