ui/gfx/font_list.cc

   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/font_list.h"
   6
   7 #include "base/lazy_instance.h"
   8 #include "base/strings/string_util.h"
   9 #include "ui/gfx/font_list_impl.h"
  10
  11 namespace {
  12
  13 // Font description of the default font set.
  14 base::LazyInstance<std::string>::Leaky g_default_font_description =
  15     LAZY_INSTANCE_INITIALIZER;
  16
  17 // The default instance of gfx::FontListImpl.
  18 base::LazyInstance<scoped_refptr<gfx::FontListImpl> >::Leaky g_default_impl =
  19     LAZY_INSTANCE_INITIALIZER;
  20 bool g_default_impl_initialized = false;
  21
  22 }  // namespace
  23
  24 namespace gfx {
  25
  26 FontList::FontList() : impl_(GetDefaultImpl()) {}
  27
  28 FontList::FontList(const FontList& other) : impl_(other.impl_) {}
  29
  30 FontList::FontList(const std::string& font_description_string)
  31     : impl_(new FontListImpl(font_description_string)) {}
  32
  33 FontList::FontList(const std::vector<std::string>& font_names,
  34                    int font_style,
  35                    int font_size)
  36     : impl_(new FontListImpl(font_names, font_style, font_size)) {}
  37
  38 FontList::FontList(const std::vector<Font>& fonts)
  39     : impl_(new FontListImpl(fonts)) {}
  40
  41 FontList::FontList(const Font& font) : impl_(new FontListImpl(font)) {}
  42
  43 FontList::~FontList() {}
  44
  45 FontList& FontList::operator=(const FontList& other) {
  46   impl_ = other.impl_;
  47   return *this;
  48 }
  49
  50 // static
  51 void FontList::SetDefaultFontDescription(const std::string& font_description) {
  52   // The description string must end with "px" for size in pixel, or must be
  53   // the empty string, which specifies to use a single default font.
  54   DCHECK(font_description.empty() ||
  55          EndsWith(font_description, "px", true));
  56
  57   g_default_font_description.Get() = font_description;
  58   g_default_impl_initialized = false;
  59 }
  60
  61 FontList FontList::Derive(int size_delta, int font_style) const {
  62   return FontList(impl_->Derive(size_delta, font_style));
  63 }
  64
  65 FontList FontList::DeriveWithSizeDelta(int size_delta) const {
  66   return Derive(size_delta, GetFontStyle());
  67 }
  68
  69 FontList FontList::DeriveWithStyle(int font_style) const {
  70   return Derive(0, font_style);
  71 }
  72
  73 int FontList::GetHeight() const {
  74   return impl_->GetHeight();
  75 }
  76
  77 int FontList::GetBaseline() const {
  78   return impl_->GetBaseline();
  79 }
  80
  81 int FontList::GetCapHeight() const {
  82   return impl_->GetCapHeight();
  83 }
  84
  85 int FontList::GetExpectedTextWidth(int length) const {
  86   return impl_->GetExpectedTextWidth(length);
  87 }
  88
  89 int FontList::GetFontStyle() const {
  90   return impl_->GetFontStyle();
  91 }
  92
  93 const std::string& FontList::GetFontDescriptionString() const {
  94   return impl_->GetFontDescriptionString();
  95 }
  96
  97 int FontList::GetFontSize() const {
  98   return impl_->GetFontSize();
  99 }
 100
 101 const std::vector<Font>& FontList::GetFonts() const {
 102   return impl_->GetFonts();
 103 }
 104
 105 const Font& FontList::GetPrimaryFont() const {
 106   return impl_->GetPrimaryFont();
 107 }
 108
 109 FontList::FontList(FontListImpl* impl) : impl_(impl) {}
 110
 111 // static
 112 const scoped_refptr<FontListImpl>& FontList::GetDefaultImpl() {
 113   // SetDefaultFontDescription() must be called and the default font description
 114   // must be set earlier than any call of this function.
 115   DCHECK(!(g_default_font_description == NULL))  // != is not overloaded.
 116       << "SetDefaultFontDescription has not been called.";
 117
 118   if (!g_default_impl_initialized) {
 119     g_default_impl.Get() =
 120         g_default_font_description.Get().empty() ?
 121             new FontListImpl(Font()) :
 122             new FontListImpl(g_default_font_description.Get());
 123     g_default_impl_initialized = true;
 124   }
 125
 126   return g_default_impl.Get();
 127 }
 128
 129 }  // namespace gfx