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Side by Side Diff: ui/ios/NSString+CrStringDrawing.mm

Issue 497503004: Add NSString category for providing iOS6-style string drawing APIs. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: pixel-align size Created 6 years, 3 months ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #import "ui/ios/NSString+CrStringDrawing.h"
6
7 #include "base/logging.h"
8
9 namespace {
10 // Returns the closest pixel-aligned value higher than |value|, taking the scale
11 // factor into account. At a scale of 1, equivalent to ceil().
12 CGFloat alignValueToUpperPixel(CGFloat value) {
stuartmorgan 2014/08/29 14:48:31 Let's upstream the existing utility (with its test
lliabraa 2014/09/02 13:29:15 Done.
13 static CGFloat scale = [[UIScreen mainScreen] scale];
14 return ceil(value * scale) / scale;
15 }
16 } // namespace
17
18 @implementation NSString (CrStringDrawing)
19
20 - (CGSize)cr_pixelAlignedSizeWithFont:(UIFont*)font {
21 DCHECK(font) << "|font| can not be nil; it is used as a NSDictionary value";
22 NSDictionary* attributes = @{ NSFontAttributeName : font };
23 CGSize size = [self sizeWithAttributes:attributes];
24 return CGSizeMake(alignValueToUpperPixel(size.width),
25 alignValueToUpperPixel(size.height));
26 }
27
28 - (CGSize)cr_sizeWithFont:(UIFont*)font {
29 if (!font)
30 return CGSizeZero;
31 NSDictionary* attributes = @{ NSFontAttributeName : font };
32 CGSize size = [self sizeWithAttributes:attributes];
33 return CGSizeMake(ceil(size.width), ceil(size.height));
34 }
35
36 @end
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