Turn off "auto-validate" for the toolbar button in Interface Builder's
attributes inspector.
On Aug 13, 2008, at 1:37 AM, Chris Idou wrote:
Ahh I see. That works for a button, but with a toolbar button it
makes the button flash momentarily, but then stays non-enabled. Any
ideas?
--- On Tue, 8/12/08, Ron Lue-Sang <[EMAIL PROTECTED]> wrote:
From: Ron Lue-Sang <[EMAIL PROTECTED]>
Subject: Re: Is this how you can use bindings?
To: "Chris Idou" <[EMAIL PROTECTED]>
Cc: "cocoa-dev@lists.apple.com" <cocoa-dev@lists.apple.com>
Date: Tuesday, August 12, 2008, 11:56 PM
The way to think about this is, you bind the value of the
text field
to a controller (or model) object that owns the value.
Then, bind the
enabled binding of the button to the same property of of
the same
controller and use a valuetransformer to check whether the
value is nil.
So your setup should look like:
- TextField value binding bound to yourObject with keypath
yourStringProperty
- button enabled binding bound to yourObject with keypath
yourStringProperty with value transformer NSIsNotNil
You may want to turn on "continuously updates
value" for the
textfiled's value binding.This way as soon as the user
starts typing,
the enabled state of the button will get toggled.
Note that part of why this works with the value transformer
is because
the textfield value binding sets nil as the value when the
textfield
is emptied.
---------------------
RONZILLA
On Aug 12, 2008, at 11:21 PM, Chris Idou
<[EMAIL PROTECTED]> wrote:
I want a button to be enabled when myTextField is not
empty.
Can have an outlet in my controller called
myTextField, and then set
the "Enabled" binding on the button to point
to
myTextField.stringValue.length, then can I write a
transformer
called GreaterThanZero to return boolean if the input
is greater
than zero?
Is that a valid way to go about this problem? It
doesn't seem to be
working for me. I wrote a myTextField accessor to see
what is
happening and it doesn't even seem to get called.
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