Accessibility/SKTHandleUIElement.m

 
/*
     File: SKTHandleUIElement.m
 Abstract: Concrete implementation of a element object for accessibility.
 
  Version: 1.1
 
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 */
 
 
#import "SKTHandleUIElement.h"
#import "SKTGraphicAccessibilityProxy.h"
 
@implementation SKTHandleUIElement
 
- (id)initWithHandleCode:(NSInteger)code parent:(id)aParent {
    self = [super initWithRole:NSAccessibilityHandleRole parent:aParent];
    if (self) {
    handleCode = code;
    }
    return self;
}
 
+ (SKTHandleUIElement *)graphicHandleWithCode:(NSInteger)code parent:(id)aParent {
    return [[[SKTHandleUIElement alloc] initWithHandleCode:code parent:aParent] autorelease];
}
 
- (NSInteger)handleCode {
    return handleCode;
}
 
#pragma mark -
#pragma mark Attributes
 
- (NSArray *)accessibilityAttributeNames {
    NSMutableArray *names = [[[super accessibilityAttributeNames] mutableCopy] autorelease];
    [names addObject:NSAccessibilityEnabledAttribute];
    [names addObject:NSAccessibilityDescriptionAttribute];
    return names;
}
 
- (id)accessibilityAttributeValue:(NSString *)attribute {
    if ([attribute isEqualToString:NSAccessibilityDescriptionAttribute]) {
    // Ask our parent for the right description
    return [parent descriptionForHandleCode:[self handleCode]];
        
    } else if ([attribute isEqualToString:NSAccessibilityEnabledAttribute]) {
    // A handle is always enabled in Sketch
    return [NSNumber numberWithBool:YES];
    
    } else {
    return [super accessibilityAttributeValue:attribute];
    }
}
 
- (BOOL)accessibilityIsAttributeSettable:(NSString *)attribute {
    if ([attribute isEqualToString:NSAccessibilityPositionAttribute]) {
    return YES;
    } else {
    return [super accessibilityIsAttributeSettable:attribute];
    }
}
 
- (void)accessibilitySetValue:(id)value forAttribute:(NSString *)attribute {
    if ([attribute isEqualToString:NSAccessibilityPositionAttribute]) {
    if ([value isKindOfClass:[NSValue class]]) {
        NSPoint screenPoint = [value pointValue];
        [parent setPosition:screenPoint forHandleUIElement:self];
    } else {
        NSAccessibilityRaiseBadArgumentException(self, attribute, value);
    }
    } else {
    [super accessibilitySetValue:value forAttribute:attribute];
    }
    
}
 
#pragma mark -
#pragma mark NSObject overridden methods
 
- (BOOL)isEqual:(id)object {
    if ([object isKindOfClass:[SKTHandleUIElement self]]) {
        SKTHandleUIElement *other = object;
        return (handleCode == other->handleCode) && [super isEqual:object];
    } else {
        return NO;
    }
}
 
- (NSUInteger)hash {
    // Equal objects must hash the same.
    return [super hash] + handleCode;
}
 
- (NSString *)description {
    return [NSString stringWithFormat:@"%@ Handle Code: %ld", [super description], (long)handleCode];
}
 
 
@end