Re: NSTableView text editing notifications/delegation vs. attributed string cells?
Re: NSTableView text editing notifications/delegation vs. attributed string cells?
- Subject: Re: NSTableView text editing notifications/delegation vs. attributed string cells?
- From: Douglas Davidson <email@hidden>
- Date: Tue, 28 Feb 2006 09:37:30 -0800
On Feb 28, 2006, at 9:25 AM, Jim Correia wrote:
The notifications/delegate methods for control text editing look
like this:
@interface NSObject(NSTextDelegate)
- (BOOL)textShouldBeginEditing:(NSText *)textObject; /* YES means
do it */
- (BOOL)textShouldEndEditing:(NSText *)textObject; /* YES means do
it */
- (void)textDidBeginEditing:(NSNotification *)notification;
- (void)textDidEndEditing:(NSNotification *)notification;
- (void)textDidChange:(NSNotification *)notification; /* Any
keyDown or paste which changes the contents causes this */
@end
Suppose I have a cell for which -allowsEditingTextAttributes is
true. What is the preferred way to get back the attributedString in
textShouldEndEditing?
NSText doesn't appear to have attributed string accessor methods. I
could certainly do the if ([textObject respondsToSelect:...]) dance
here, but I'm wondering if I might have missed something obvious?
These probably aren't the methods you're looking for. The best thing
is to act as the table view's delegate, and implement the methods
defined in NSControl.h starting with
control:textShouldBeginEditing:. The methods you list above are
those that the controls themselves (such as NSTableView) implement to
receive delegate messages from the field editor; in these methods
they then call out to their own delegates using methods like
control:textShouldBeginEditing:. If you were implementing a table
view subclass, you could override the NSText delegate methods, but
that would have to be done with great care.
The other thing is that in the AppKit as it stands, NSText is an
abstract class; the concrete subclass used is NSTextView. The
distinction between NSText and NSTextView is a historical artifact,
and you may assume that field editors will be NSTextViews.
Douglas Davidson
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