/*

     File: ImageMapExampleController.m 

 Abstract: controller object for image map example 

  Version: 1.1 

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 */ 

#import "ImageMapExampleController.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 ImageMapExampleController

- (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 {

    NSInteger segmentIndex = [segmentedControl selectedSegment];

    BOOL hotSpotsVisible = NO;

    BOOL rolloverHighlighting = NO;

    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