Hi, all. I've been banging my head against this for some time now and
I'm at a bit of a loss. I've searched the archives and haven't found
much info on NSRuleEditor other than before Leopard was released and
it was taboo because of NDA. Bear with me as I've done some
experimentation that might help troubleshoot the problem if I weren't
so cross-eyed from it already. :) I've read the documentation and
NSRuleEditor.h more times than I care to admit.
The first method below is the initializer for my criterion class
JPCriterion. The next three methods are NSRuleEditor's required
delegate methods. When the criterion parameter of these is nil, it
means to request a root criterion. I want to have three root criteria
(It presents a drop-down menu.) but if I increase the number of
children for the root, the row displays as shown in this screenshot: http://skitch.com/jrphelps/wcgu/nsruleeditor-troubles
In addition to tinkering with my app, I have also created a test
project, which I have posted here: http://www.jamiephelps.com/RuleEditorTest.zip
This is really simple. It returns a random number of criteria using
rand()%7 and ensures that there is at least one root criterion by
rand()%7+1. The display value is always the same. This exhibits the
expected behavior when there is more than one root criterion. Since it
uses NSRuleEditor, it's Leopard only. I'm also using GC just for
convenience for demo purposes.
So, if you have any thoughts about what the difference is between my
implementation that catches the janks for root criteria > 1 and the
example one that exhibits the correct behavior, I'd greatly appreciate
it.
Thanks a ton,
Jamie
-(id)initWithTreeDepth:(NSInteger)depth branch:(NSInteger)node{
if(self = [super init]){
[self setValue:[NSNumber numberWithInt:depth]
forKey:@"treeDepth"];
[self setValue:[NSNumber numberWithInt:node] forKey:@"index"];
children = [[NSMutableArray alloc] init];
switch(depth){
case 1:
[children addObject:[[[JPRegexBuilderCriterion alloc]
initWithTreeDepth:2 branch:0]] autorelease];
[children addObject:[[[JPRegexBuilderCriterion alloc]
initWithTreeDepth:2 branch:1]] autorelease];
switch(node){
case 0:
[self setValue:@"Foo" forKey:@"displayValue"];
break;
case 1:
[self setValue:@"Bar" forKey:@"displayValue"];
break;
case 2:
[self setValue:@"Bat" forKey:@"displayValue"];
break;
}
break;
...etc.
- (id)ruleEditor:(NSRuleEditor *)editor
child:(NSInteger)index
forCriterion:(id)criterion
withRowType:(NSRuleEditorRowType)rowType
{
if(criterion == nil){
JPCriterion *c = [[[JPCriterion alloc] initWithTreeDepth:1
branch:index] autorelease];
return c;
}
return [[criterion children] objectAtIndex:index];
}
- (id)ruleEditor:(NSRuleEditor *)editor
displayValueForCriterion:(id)criterion
inRow:(NSInteger)row
{
return [criterion valueForKey:@"displayValue"];
}
- (NSInteger)ruleEditor:(NSRuleEditor *)editor
numberOfChildrenForCriterion:(id)criterion
withRowType:(NSRuleEditorRowType)rowType
{
// Anything greater than 1 causes the rows
// to display empty with + and - buttons.
if(criterion == nil) return 1;
return [[criterion children] count];
}
@end
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