Re: NSTextField value binding and button click

FROM : Lieven Dekeyser
DATE : Tue Jan 29 11:56:31 2008

On 28 Jan 2008, at 23:35, Quincey Morris wrote:

> On Jan 28, 2008, at 13:11, Lieven Dekeyser wrote:
>

>> In my app, I have a basic login form: username field, password field
>> and login button. The username and password fields' values are bound
>> to a custom controller that saves the values after editing. When the
>> login button is clicked, the username and password are fetched from
>> the custom controller.
>>
>> ...
>>
>> Is there any way to make sure the password field's editor ends when
>> the user clicks on a button?

>
>
> Assuming you mean "custom controller" in the MVC sense, I think all 
> you need to do is to insert a suitable NSController 
> (NSObjectController, I expect) into your NIB file and connect the 
> text fields to their contents through it. Here's a quote from the 
> Cocoa document "Cocoa Bindings Programming Topics", section "What 
> Are Cocoa Bindings?", subsection "Why Are NSControllers Useful?":
>
> --
> "NSController (and Application Kit user interface elements that 
> support binding) implements the NSEditor and NSEditorRegistration 
> protocols. The NSEditorRegistration protocol provides a means for an 
> editor (a view) to inform a controller when it has uncommitted 
> changes. The NSEditor protocol provides a means for requesting that 
> the receiver commit or discard any pending edits.
>
> "For example, if a user is typing in a text field and then clicks a 
> button, the controller ensures that the model object is updated with 
> the complete contents of the text field before the button action 
> takes place.
>
> "Although the methods are typically invoked on user interface 
> elements by a controller they can also be sent to a controller, for 
> example in response to a user’s attempt to save a document or quit 
> an application."
> --
>
> The middle paragraph is the one that promises to do for free what 
> you are asking.



Unfortunately, it doesn't seem to be working as advertised. When I use 
an NSObjectController, I still have to call -commitEditing on it when 
the button is clicked, otherwise my model is not updated... I'd expect 
NSTextField to lose focus and commit automatically when the user 
clicks a button, but the field doesn't seem to lose focus...

--Lieven_______________________________________________

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