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POtextShouldEndEditing does not get called in NSTableView
 

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  1. POtextShouldEndEditing does not get called in NSTableView
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    <p>When a user adds a new managed object, it shows up in a table, which scrolls down to the new entry, and the name of the new object (a default value) goes into editing mode.</p> <p>I need to check if the name of the new object is unique in the datastore, so I can't use a formatter for this. I think the perfect moment where I should validate this, is whenever the user tries to commit the entry's name value, using <code>textShouldEndEditing:</code>.</p> <p>I subclassed <code>NSTableView</code> and overrid following methods, just to be able to check in the log if they get called.</p> <pre><code>- (BOOL)textShouldEndEditing:(NSText *)textObject { NSLog(@"textSHOULDendEditing fired in MyTableView"); return [super textShouldEndEditing:textObject]; } - (BOOL)control:(NSControl *)control textShouldEndEditing:(NSText *)fieldEditor { NSLog(@"control:textShouldEndEditing fired in MyTableView"); return YES; } - (void)textDidEndEditing:(NSNotification *)aNotification { NSLog(@"textDIDEndEditing fired in MyTableView"); } </code></pre> <p><code>textDidEndEditing:</code> gets called fine, but <code>textShouldEndEditing:</code> does not. </p> <p>In the <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ApplicationKit/Classes/NSTableView_Class/Reference/Reference.html" rel="nofollow">NSTableView Class Reference</a>, under Text Delegate Methods, both methods <code>textShouldEndEditing:</code> and <code>textDidEndEditing:</code> are listed. Someone please explain why one gets called and the other doesn't.</p> <hr> <p>I think the <code>NSTableView</code> acts as the delegate for an <code>NSTextField</code> that gets instantiated as a <em>black box</em> delegate for the <code>NSTextFieldCell</code>. So what is referred to as <em>delegate</em> methods in the <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ApplicationKit/Classes/NSTableView_Class/Reference/Reference.html" rel="nofollow">NSTableView Class Reference</a>, actually implement the text manipulating methods for the <code>NSTextField</code> object.</p> <p>I tried to declare the <code>NSTextFieldCell</code> as an outlet in my <code>NSTableView</code>. I also tried to declare several protocols in the <code>NSTableView</code>.</p> <pre><code>#import &lt;AppKit/AppKit.h&gt; #import &lt;Cocoa/Cocoa.h&gt; @interface MyTableView : NSTableView &lt;NSTextDelegate, NSTextFieldDelegate, NSControlTextEditingDelegate, NSTableViewDelegate, NSTableViewDataSource&gt; { } @end </code></pre> <p>Don't laugh, I even tried to declare my table view as its own delegate :P</p>
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    1. COIs it not the `<NSTextDelegate>` protocol that needs to be implemented? Does anyone know how `NSTextDelegate` methods of the `NSTextFieldCell` are forwarded? Is there any documentation around? (Believe me, I've looked) Or is there an object up the command chain that functions by default as `NSTextDelegate` (such as the `NSTableView`)? Is it possible that some `NSTextDelegate` methods are overridden by another class which is first in the command chain?
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    2. COFound an interesting document in the Mac OS X Developer Libraries: [Cocoa Text Architecture Guide](http://developer.apple.com/library/mac/#documentation/TextFonts/Conceptual/CocoaTextArchitecture/Introduction/Introduction.html#//apple_ref/doc/uid/TP40009459-CH1-SW1), with lots of pointers to other technologies and examples. I'll get back when I know more :)
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    3. COThe [Text Editing](http://developer.apple.com/library/mac/#documentation/TextFonts/Conceptual/CocoaTextArchitecture/TextEditing/TextEditing.html#//apple_ref/doc/uid/TP40009459-CH3-SW1) chapter of the Cocoa Text Architecture Guide says: **Text Change Notifications and Delegate Messages** _The textShouldBeginEditing: and textDidBeginEditing: messages are sent only once during an editing session. More precisely, they’re sent upon the first user input since the NSTextView became the first responder._ The fact that the text was selected did not notify the text field that editing was being done.
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