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//
// NSString+TruncatedForWidthWithAttributesMode.m
// xTableImage
//
// Created by Uli Kusterer on 28.09.06.
// Copyright 2006 Uli Kusterer.
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
#import "NSString+TruncatedForWidthWithAttributesMode.h"
@implementation NSString (UKTruncatedForWidthWithAttributesMode)
// -----------------------------------------------------------------------------
// Returns a truncated version of the specified string that fits a width:
// Appends/Inserts three periods as an "ellipsis" to/in the string to
// indicate when and where it was truncated.
// -----------------------------------------------------------------------------
-(NSString*) truncatedForWidth: (int)wid withAttributes: (NSDictionary*)attrs
mode: (NSLineBreakMode)truncateMode
{
NSSize txSize = [self sizeWithAttributes: attrs];
if( txSize.width <= wid ) // Don't do anything if it fits.
return self;
NSMutableString* currString = [NSMutableString string];
NSRange rangeToCut = { 0, 0 };
if( truncateMode == NSLineBreakByTruncatingTail )
{
rangeToCut.location = [self length] -1;
rangeToCut.length = 1;
}
else if( truncateMode == NSLineBreakByTruncatingHead )
{
rangeToCut.location = 0;
rangeToCut.length = 1;
}
else // NSLineBreakByTruncatingMiddle
{
rangeToCut.location = [self length] / 2;
rangeToCut.length = 1;
}
while( txSize.width > wid )
{
if( truncateMode != NSLineBreakByTruncatingHead && rangeToCut.location <= 1 )
return @"...";
[currString setString: self];
[currString replaceCharactersInRange: rangeToCut withString: @"..."];
txSize = [currString sizeWithAttributes: attrs];
rangeToCut.length++;
if( truncateMode == NSLineBreakByTruncatingHead )
; // No need to fix location, stays at start.
else if( truncateMode == NSLineBreakByTruncatingTail )
rangeToCut.location--; // Fix location so range that's one longer still lies inside our string at end.
else if( (rangeToCut.length & 1) != 1 ) // even? NSLineBreakByTruncatingMiddle
rangeToCut.location--; // Move location left every other time, so it grows to right and left and stays centered.
if( rangeToCut.location < 0 || (rangeToCut.location +rangeToCut.length) > [self length] )
return @"...";
}
return currString;
}
@end