Re: NSBrowser: so very, very broken

FROM : John C. Randolph
DATE : Sun Jan 26 05:46:34 2003

On Saturday, January 25, 2003, at 02:40 AM, j o a r wrote:

> On Saturday, Jan 25, 2003, at 01:54 Europe/Stockholm, Clark Mueller
> wrote:
>

>> I pretty much went into cardiac arrest after I found out how much
>> work NSBrowser involves for so little in return. I've gone about
>> writing all of the stuff I need almost completely from scratch.
>> NSBrowser simply doesn't pull its weight for most of the places in
>> which it might be practically applied. It's annoying.

>
> I beg to differ. Provided that you already have a tree of data - the
> prerequisite for a browser / outline view - the implementation of the
> delegate / data source for a browser is _not_ much more cumbersome or
> even different than the code you have to write for a table view.


[code example snipped]

I'll just mention as well, that when I wrote my Obj-C runtime hierarchy
browser back before I took this job at Apple, my browser delegate
methods came to just:

@implementation RuntimeBrowserDelegate

- (int)browser:(NSBrowser *)sender numberOfRowsInColumn:(int)column;
  {
  ClassEnumerator
    *enumerator =  (column == 0 ? [ClassEnumerator rootClassEnumerator]
:
      [ClassEnumerator
subclassEnumeratorForClass:NSClassFromString([[sender
selectedCellInColumn:column-1] title])]);
  return [enumerator countRemainingObjects];
  }

- (void)browser:(NSBrowser *)sender willDisplayCell:(id)cell
atRow:(int)row column:(int)column
  {
  NSArray
    *classNames = (column == 0 ?
      [[ClassEnumerator rootClassEnumerator] sortedNames] :
      [ClassEnumerator sortedSubclassNamesForClassNamed:[[sender
selectedCellInColumn:column-1] title]]);

  [cell setTitle:[classNames objectAtIndex:row]];
  [cell setLeaf:!classHasDescendants(NSClassFromString([cell title]))];
  }

@end

The bulk of the work was implementing my ClassEnumerator class (which
is still only about 300 lines of code, including a bunch of stuff for
caching lookups already performed, etc.)

-jcr

John C. Randolph    <<email_removed>>  (408) 974-8819
Sr. Cocoa Software Engineer,
Apple Worldwide Developer Relations
http://developer.apple.com/cocoa/index.html
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