ImageMapExample/ImageMapExampleController.m
/* |
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 |
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