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adium / Source / AIDefaultFontRemovalPlugin.m

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//
//  AIDefaultFontRemoval.m
//  Adium
//
//  Created by Zachary West on 2009-10-28.
//  Copyright 2009  . All rights reserved.
//

#import "AIDefaultFontRemovalPlugin.h"
#import <AIUtilities/AIFontAdditions.h>
#import <AIUtilities/AIColorAdditions.h>

@implementation AIDefaultFontRemovalPlugin
- (void)installPlugin
{
        // We only monitor outgoing messages.
        [adium.contentController registerContentFilter:self ofType:AIFilterContent direction:AIFilterOutgoing]; 
}

- (void)uninstallPlugin
{
        [adium.contentController unregisterContentFilter:self];
}

- (void)dealloc
{
        [defaultRemovedAttributes release];
        [super dealloc];
}

- (NSAttributedString *)filterAttributedString:(NSAttributedString *)inAttributedString context:(id)context
{
        if (!inAttributedString || ![inAttributedString length]) return inAttributedString;
        
        NSMutableAttributedString *mutableString = [inAttributedString mutableCopy];
                
        if (!defaultRemovedAttributes) {
                NSFont *defaultFont = [[adium.preferenceController defaultPreferenceForKey:KEY_FORMATTING_FONT
                                                                                                                                                         group:PREF_GROUP_FORMATTING
                                                                                                                                                        object:nil] representedFont];
                
                defaultRemovedAttributes = [[NSDictionary dictionaryWithObjectsAndKeys:
                                                                         defaultFont, NSFontAttributeName,
                                                                         [NSColor colorWithCalibratedRed:1.0 green:1.0 blue:1.0 alpha:1.0], NSBackgroundColorAttributeName,
                                                                         nil] retain];
        }
        
        for (NSString *attributeName in defaultRemovedAttributes.allKeys) {
                NSUInteger position = 0;
                
                while (position < mutableString.length) {
                        NSRange attributeRange;
                        id attributeValue = [mutableString attribute:attributeName
                                                                                                 atIndex:position
                                                                                  effectiveRange:&attributeRange];

                        if (attributeValue && [attributeValue isEqualTo:[defaultRemovedAttributes objectForKey:attributeName]]) {
                                [mutableString removeAttribute:attributeName range:attributeRange];
                        }
                        
                        position += attributeRange.length;
                }
        }
        
        return [mutableString autorelease];
}

/*!
 * @brief When should this run?
 *
 * We want this font removal to occur as early as possible, in case any other filters try and modify the fonts.
 */
- (CGFloat)filterPriority
{
        return HIGHEST_FILTER_PRIORITY;
}

@end