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- // Copyright 2014 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #import "ui/gfx/ios/NSString+CrStringDrawing.h"
- #include <ostream>
- #include <stddef.h>
- #include "base/check.h"
- #include "ui/gfx/ios/uikit_util.h"
- @implementation NSString (CrStringDrawing)
- - (CGRect)cr_boundingRectWithSize:(CGSize)size
- font:(UIFont*)font {
- NSDictionary* attributes = font ? @{NSFontAttributeName: font} : @{};
- return [self boundingRectWithSize:size
- options:NSStringDrawingUsesLineFragmentOrigin
- attributes:attributes
- context:nil];
- }
- - (CGSize)cr_boundingSizeWithSize:(CGSize)size
- font:(UIFont*)font {
- return [self cr_boundingRectWithSize:size font:font].size;
- }
- - (CGSize)cr_pixelAlignedSizeWithFont:(UIFont*)font {
- DCHECK(font) << "|font| can not be nil; it is used as a NSDictionary value";
- NSDictionary* attributes = @{ NSFontAttributeName : font };
- return ui::AlignSizeToUpperPixel([self sizeWithAttributes:attributes]);
- }
- - (CGSize)cr_sizeWithFont:(UIFont*)font {
- if (!font)
- return CGSizeZero;
- NSDictionary* attributes = @{ NSFontAttributeName : font };
- CGSize size = [self sizeWithAttributes:attributes];
- return CGSizeMake(ceil(size.width), ceil(size.height));
- }
- - (NSString*)cr_stringByCuttingToIndex:(NSUInteger)index {
- if (index == 0)
- return @"";
- if (index >= [self length])
- return [[self retain] autorelease];
- return [[self substringToIndex:(index - 1)] stringByAppendingString:@"…"];
- }
- - (NSString*)cr_stringByElidingToFitSize:(CGSize)bounds {
- CGSize sizeForGuess = CGSizeMake(bounds.width, CGFLOAT_MAX);
- // Use binary search on the string's length.
- size_t lo = 0;
- size_t hi = [self length];
- size_t guess = 0;
- for (guess = (lo + hi) / 2; lo < hi; guess = (lo + hi) / 2) {
- NSString* tempString = [self cr_stringByCuttingToIndex:guess];
- UIFont* font = [UIFont systemFontOfSize:[UIFont labelFontSize]];
- CGSize sizeGuess =
- [tempString cr_boundingSizeWithSize:sizeForGuess font:font];
- if (sizeGuess.height > bounds.height) {
- hi = guess - 1;
- if (hi < lo)
- hi = lo;
- } else {
- lo = guess + 1;
- }
- }
- return [self cr_stringByCuttingToIndex:lo];
- }
- @end
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