Home | History | Annotate | Download | only in gfx 
      1 // Copyright (c) 2012 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 #include "ui/gfx/platform_font_ios.h"
      6 
      7 #import <UIKit/UIKit.h>
      8 
      9 #include "base/basictypes.h"
     10 #include "base/strings/sys_string_conversions.h"
     11 #include "base/strings/utf_string_conversions.h"
     12 #include "ui/gfx/font.h"
     13 
     14 namespace gfx {
     15 
     16 ////////////////////////////////////////////////////////////////////////////////
     17 // PlatformFontIOS, public:
     18 
     19 PlatformFontIOS::PlatformFontIOS() {
     20   font_size_ = [UIFont systemFontSize];
     21   style_ = gfx::Font::NORMAL;
     22   UIFont* system_font = [UIFont systemFontOfSize:font_size_];
     23   font_name_ = base::SysNSStringToUTF8([system_font fontName]);
     24   CalculateMetrics();
     25 }
     26 
     27 PlatformFontIOS::PlatformFontIOS(NativeFont native_font) {
     28   std::string font_name = base::SysNSStringToUTF8([native_font fontName]);
     29   InitWithNameSizeAndStyle(font_name,
     30                            [native_font pointSize],
     31                            gfx::Font::NORMAL);
     32 }
     33 
     34 PlatformFontIOS::PlatformFontIOS(const std::string& font_name,
     35                                  int font_size) {
     36   InitWithNameSizeAndStyle(font_name, font_size, gfx::Font::NORMAL);
     37 }
     38 
     39 ////////////////////////////////////////////////////////////////////////////////
     40 // PlatformFontIOS, PlatformFont implementation:
     41 
     42 Font PlatformFontIOS::DeriveFont(int size_delta, int style) const {
     43   return Font(new PlatformFontIOS(font_name_, font_size_ + size_delta, style));
     44 }
     45 
     46 int PlatformFontIOS::GetHeight() const {
     47   return height_;
     48 }
     49 
     50 int PlatformFontIOS::GetBaseline() const {
     51   return ascent_;
     52 }
     53 
     54 int PlatformFontIOS::GetCapHeight() const {
     55   return cap_height_;
     56 }
     57 
     58 int PlatformFontIOS::GetExpectedTextWidth(int length) const {
     59   return length * average_width_;
     60 }
     61 
     62 int PlatformFontIOS::GetStyle() const {
     63   return style_;
     64 }
     65 
     66 std::string PlatformFontIOS::GetFontName() const {
     67   return font_name_;
     68 }
     69 
     70 std::string PlatformFontIOS::GetActualFontNameForTesting() const {
     71   return base::SysNSStringToUTF8([GetNativeFont() familyName]);
     72 }
     73 
     74 int PlatformFontIOS::GetFontSize() const {
     75   return font_size_;
     76 }
     77 
     78 NativeFont PlatformFontIOS::GetNativeFont() const {
     79   return [UIFont fontWithName:base::SysUTF8ToNSString(font_name_)
     80                          size:font_size_];
     81 }
     82 
     83 ////////////////////////////////////////////////////////////////////////////////
     84 // PlatformFontIOS, private:
     85 
     86 PlatformFontIOS::PlatformFontIOS(const std::string& font_name,
     87                                  int font_size,
     88                                  int style) {
     89   InitWithNameSizeAndStyle(font_name, font_size, style);
     90 }
     91 
     92 void PlatformFontIOS::InitWithNameSizeAndStyle(const std::string& font_name,
     93                                                int font_size,
     94                                                int style) {
     95   font_name_ = font_name;
     96   font_size_ = font_size;
     97   style_ = style;
     98   CalculateMetrics();
     99 }
    100 
    101 void PlatformFontIOS::CalculateMetrics() {
    102   UIFont* font = GetNativeFont();
    103   height_ = font.lineHeight;
    104   ascent_ = font.ascender;
    105   cap_height_ = font.capHeight;
    106   average_width_ = [@"x" sizeWithFont:font].width;
    107 }
    108 
    109 ////////////////////////////////////////////////////////////////////////////////
    110 // PlatformFont, public:
    111 
    112 // static
    113 PlatformFont* PlatformFont::CreateDefault() {
    114   return new PlatformFontIOS;
    115 }
    116 
    117 // static
    118 PlatformFont* PlatformFont::CreateFromNativeFont(NativeFont native_font) {
    119   return new PlatformFontIOS(native_font);
    120 }
    121 
    122 // static
    123 PlatformFont* PlatformFont::CreateFromNameAndSize(const std::string& font_name,
    124                                                   int font_size) {
    125   return new PlatformFontIOS(font_name, font_size);
    126 }
    127 
    128 }  // namespace gfx
    129