ImageMapController.m

/*
 
File: ImageMapController.m
 
Abstract: controller object for image map example
 
Version: <1.0>
 
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*/ 
 
#import "ImageMapController.h"
#import "ImageMap.h"
 
static void SetSegmentDescriptions(NSSegmentedControl *control, NSString *firstDescription, ...) {
    // Use NSAccessibilityUnignoredDescendant to be sure we start with the correct object.
    id segmentElement = NSAccessibilityUnignoredDescendant(control);
    
    // Use the accessibility protocol to get the children.
    NSArray *segments = [segmentElement accessibilityAttributeValue:NSAccessibilityChildrenAttribute];
    
    va_list args;
    va_start(args, firstDescription);
    
    id segment;
    NSString *description = firstDescription;
    NSEnumerator *e = [segments objectEnumerator];
    while ((segment = [e nextObject])) {
        if (description != nil) {
            [segment accessibilitySetOverrideValue:description forAttribute:NSAccessibilityDescriptionAttribute];
        } else {
            // Exit loop if we run out of descriptions.
            break;
        }
        description = va_arg(args, id);
    }
    
    va_end(args);
}
 
 
@implementation ImageMapController
 
- (void)awakeFromNib {
 
    // configure image map
    [imageMap setImageAndHotSpotsFromImageAndImageMapNamed:@"FoodPyramid"];
    [imageMap setTarget:self];
    [imageMap setAction:@selector(imageMapAction:)];
    [imageMap setHotSpotCompositeOperation:NSCompositePlusLighter];
    
    
    // configure segmented control
    [segmentedControl setImage:[NSImage imageNamed:@"InvisibleHotSpots"] forSegment:0];
    [segmentedControl setImage:[NSImage imageNamed:@"VisibleHotSpots"] forSegment:1];
    [segmentedControl setImage:[NSImage imageNamed:@"RolloverHighlighting"] forSegment:2];
    [segmentedControl setSelectedSegment:0];
 
    // set up segmented control accessibility
 
    id segmentedControlElement = NSAccessibilityUnignoredDescendant(segmentedControl);
    id segmentedControlTitleElement = NSAccessibilityUnignoredDescendant(segmentedControlTitle);
    [segmentedControlElement accessibilitySetOverrideValue:segmentedControlTitleElement forAttribute:NSAccessibilityTitleUIElementAttribute];
 
    SetSegmentDescriptions(segmentedControl, @"invisible hot spots", @"visible hot spots", @"rollover highlighting", nil);
}
 
- (IBAction)segmentedControlAction:(id)sender {
    int segmentIndex = [segmentedControl selectedSegment];
    BOOL hotSpotsVisible;
    BOOL rolloverHighlighting;
    switch (segmentIndex) {
    case 0:
        hotSpotsVisible = NO;
        rolloverHighlighting = NO;
        break;
    case 1:
        hotSpotsVisible = YES;
        rolloverHighlighting = NO;
        break;
    case 2:
        hotSpotsVisible = NO;
        rolloverHighlighting = YES;
        break;
    }
    [imageMap setHotSpotsVisible:hotSpotsVisible];
    [imageMap setRolloverHighlighting:rolloverHighlighting];
}
 
- (void)hotSpotAction_grains {
    [imageTextField setStringValue:@"Grains"];
}
- (void)hotSpotAction_vegetables {
    [imageTextField setStringValue: @"Vegetables"];
}
- (void)hotSpotAction_fruits {
    [imageTextField setStringValue:@"Fruits"];
}
- (void)hotSpotAction_dairy {
    [imageTextField setStringValue:@"Dairy"];
}
- (void)hotSpotAction_meat {
    [imageTextField setStringValue:@"Meat and Eggs"];
}
- (void)hotSpotAction_fats {
    [imageTextField setStringValue:@"Fats and Sweets"];
}
 
- (IBAction)imageMapAction:(id)sender {
    NSDictionary *info = [imageMap selectedHotSpotInfo];
    NSString *href = [info objectForKey:@"href"];
    if ([href length] > 0) {
        SEL action = NSSelectorFromString([NSString stringWithFormat:@"hotSpotAction_%@", href]);
        if ([self respondsToSelector:action]) {
            [self performSelector:action];
        } else {
            NSLog(@"unsupported hot spot: %@", info);
        }
    }
}
 
 
@end