cog/Spotlight/SpotlightTransformers.m

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//
// SpotlightTransformers.m
// Cog
//
// Created by Matthew Grinshpun on 11/02/08.
// Copyright 2008 Matthew Leon Grinshpun. All rights reserved.
//
#import "SpotlightTransformers.h"
#import "SpotlightWindowController.h"
// This is what we use instead of an outlet for PausingQueryTransformer
static SpotlightWindowController * searchController;
@implementation PausingQueryTransformer
+ (Class)transformedValueClass { return [NSArray class]; }
+ (BOOL)allowsReverseTransformation { return NO; }
+ (void)setSearchController:(SpotlightWindowController *)aSearchController
{
searchController = aSearchController;
}
- (id)transformedValue:(id)value {
// Rather unintuitively, this piece of code eliminates the "flicker"
// when searching for new results, which resulted from a pause when the
// search query stops gathering and sends an empty results array through KVO.
if(([value count] > 0) || ([searchController.query isGathering]))
{
self.oldResults = (NSArray *)value;
}
return self.oldResults;
}
- (void)dealloc
{
self.oldResults = nil;
}
@synthesize oldResults;
@end
@implementation AuthorToArtistTransformer
+ (Class)transformedValueClass { return [NSString class]; }
+ (BOOL)allowsReverseTransformation { return NO; }
- (id)transformedValue:(id)value {
return [value objectAtIndex:0];
}
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@end
@implementation PathToURLTransformer
+ (Class)transformedValueClass { return [NSURL class]; }
+ (BOOL)allowsReverseTransformation { return YES; }
// Convert from path to NSURL
- (id)transformedValue:(id)value {
if (value == nil) return nil;
return [NSURL fileURLWithPath:value];
}
// Convert from NSURL to path
- (id)reverseTransformedValue:(id)value {
if (value == nil) return nil;
return [value path];
}
@end
@implementation StringToSearchScopeTransformer
+ (Class)transformedValueClass { return [NSArray class]; }
+ (BOOL)allowsReverseTransformation { return NO; }
// Convert from URL string to Search Scope
- (id)transformedValue:(id)value {
if (value == nil) return nil;
NSURL *scope = [NSURL URLWithString:value];
return [NSArray arrayWithObject: scope];
}
@end
@implementation NumberToStringTransformer
+ (Class)transformedValueClass { return [NSString class]; }
+ (BOOL)allowsReverseTransformation { return NO; }
// Convert from NSNumber to NSString
- (id)transformedValue:(id)value {
if (value == nil) return nil;
// If there's an NS/CFNumber hiding in here...
if([value respondsToSelector:@selector(stringValue:)])
{
return [value stringValue];
}
return value;
}
@end