ImageMapExample/FauxUIElement.m

/*
     File: FauxUIElement.m 
 Abstract: abstract ui element object for accessibility 
  Version: 1.1 
  
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 */
 
#import "FauxUIElement.h"
 
#import <AppKit/NSAccessibility.h>
 
@implementation FauxUIElement
 
- (id)initWithRole:(NSString *)aRole parent:(id)aParent {
    
    self = [super init];
    if (self) {
        role = [aRole retain];
        parent = aParent;
    }
    
    return self;
}
 
+ (FauxUIElement *)elementWithRole:(NSString *)aRole parent:(id)aParent {
    return [[[self alloc] initWithRole:aRole parent:aParent] autorelease];
}
 
- (void)dealloc {
    [role release];
    [super dealloc];
}
 
- (BOOL)isEqual:(id)object {
    if ([object isKindOfClass:[FauxUIElement class]]) {
        FauxUIElement *other = object;
        return [role isEqualToString:other->role] && [parent isEqual:other->parent];
    } else
        return NO;
}
 
- (NSUInteger)hash {
    // Equal objects must hash the same.
    return [role hash] + [parent hash];
}
 
//
// accessibility protocol
//
 
// attributes
 
- (NSArray *)accessibilityAttributeNames {
    static NSArray *attributes = nil;
    if (attributes == nil) {
    attributes = [[NSArray alloc] initWithObjects:
        NSAccessibilityRoleAttribute,
        NSAccessibilityRoleDescriptionAttribute,
        NSAccessibilityFocusedAttribute,
        NSAccessibilityParentAttribute,
        NSAccessibilityWindowAttribute,
        NSAccessibilityTopLevelUIElementAttribute,
        NSAccessibilityPositionAttribute,
        NSAccessibilitySizeAttribute,
        nil];
    }
    return attributes;
}
 
- (id)accessibilityAttributeValue:(NSString *)attribute {
    if ([attribute isEqualToString:NSAccessibilityRoleAttribute]) {
        return role;
    } else if ([attribute isEqualToString:NSAccessibilityRoleDescriptionAttribute]) {
        return NSAccessibilityRoleDescription(role, nil);
    } else if ([attribute isEqualToString:NSAccessibilityFocusedAttribute]) {
        // Just check if the app thinks we're focused.
        id focusedElement = [NSApp accessibilityAttributeValue:NSAccessibilityFocusedUIElementAttribute];
        return [NSNumber numberWithBool:[focusedElement isEqual:self]];
    } else if ([attribute isEqualToString:NSAccessibilityParentAttribute]) {
        return NSAccessibilityUnignoredAncestor(parent);
    } else if ([attribute isEqualToString:NSAccessibilityWindowAttribute]) {
        // We're in the same window as our parent.
        return [parent accessibilityAttributeValue:NSAccessibilityWindowAttribute];
    } else if ([attribute isEqualToString:NSAccessibilityTopLevelUIElementAttribute]) {
        // We're in the same top level element as our parent.
        return [parent accessibilityAttributeValue:NSAccessibilityTopLevelUIElementAttribute];
    } else if ([attribute isEqualToString:NSAccessibilityPositionAttribute]) {
        return [NSValue valueWithPoint:[parent fauxUIElementPosition:self]];
    } else if ([attribute isEqualToString:NSAccessibilitySizeAttribute]) {
        return [NSValue valueWithSize:[parent fauxUIElementSize:self]];
    }
    
    return nil;
}
 
- (BOOL)accessibilityIsAttributeSettable:(NSString *)attribute {
    if ([attribute isEqualToString:NSAccessibilityFocusedAttribute]) {
    return [parent isFauxUIElementFocusable:self];
    } else {
    return NO;
    }
}
 
- (void)accessibilitySetValue:(id)value forAttribute:(NSString *)attribute {
    if ([attribute isEqualToString:NSAccessibilityFocusedAttribute]) {
    [parent fauxUIElement:self setFocus:value];
    }
}
 
 
// actions
 
- (NSArray *)accessibilityActionNames {
    return [NSArray array];
}
 
- (NSString *)accessibilityActionDescription:(NSString *)action {
    return nil;
}
 
- (void)accessibilityPerformAction:(NSString *)action {
}
 
 
// misc
 
- (BOOL)accessibilityIsIgnored {
    return NO;
}
 
- (id)accessibilityHitTest:(NSPoint)point {
    return NSAccessibilityUnignoredAncestor(self);
}
 
- (id)accessibilityFocusedUIElement {
    return NSAccessibilityUnignoredAncestor(self);
}
 
@end