ui/base/l10n/l10n_util_win.cc

   1 // Copyright (c) 2011 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/base/l10n/l10n_util_win.h"
   6
   7 #include <windowsx.h>
   8 #include <algorithm>
   9 #include <iterator>
  10
  11 #include "base/i18n/rtl.h"
  12 #include "base/lazy_instance.h"
  13 #include "base/string_number_conversions.h"
  14 #include "base/win/i18n.h"
  15 #include "base/win/windows_version.h"
  16 #include "grit/app_locale_settings.h"
  17 #include "ui/base/l10n/l10n_util.h"
  18 #include "ui/base/win/dpi.h"
  19
  20 namespace {
  21
  22 void AdjustLogFont(const string16& font_family,
  23                    double font_size_scaler,
  24                    double dpi_scale,
  25                    LOGFONT* logfont) {
  26   DCHECK(font_size_scaler > 0);
  27   font_size_scaler = std::max(std::min(font_size_scaler, 2.0), 0.7);
  28   // Font metrics are computed in pixels and scale in high-DPI mode.
  29   // Normalized by the DPI scale factor in order to work in DIP with
  30   // Views/Aura. Call with dpi_scale=1 to keep the size in pixels.
  31   font_size_scaler /= dpi_scale;
  32   logfont->lfHeight = static_cast<long>(font_size_scaler *
  33       static_cast<double>(abs(logfont->lfHeight)) + 0.5) *
  34       (logfont->lfHeight > 0 ? 1 : -1);
  35
  36   // TODO(jungshik): We may want to check the existence of the font.
  37   // If it's not installed, we shouldn't adjust the font.
  38   if (font_family != L"default") {
  39     int name_len = std::min(static_cast<int>(font_family.size()),
  40                             LF_FACESIZE -1);
  41     memcpy(logfont->lfFaceName, font_family.data(), name_len * sizeof(WORD));
  42     logfont->lfFaceName[name_len] = 0;
  43   }
  44 }
  45
  46 bool IsFontPresent(const wchar_t* font_name) {
  47   HFONT hfont = CreateFont(12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  48                            font_name);
  49   if (hfont == NULL)
  50     return false;
  51   HDC dc = GetDC(0);
  52   HGDIOBJ oldFont = static_cast<HFONT>(SelectObject(dc, hfont));
  53   WCHAR actual_font_name[LF_FACESIZE];
  54   DWORD size_ret = GetTextFace(dc, LF_FACESIZE, actual_font_name);
  55   actual_font_name[LF_FACESIZE - 1] = 0;
  56   SelectObject(dc, oldFont);
  57   DeleteObject(hfont);
  58   ReleaseDC(0, dc);
  59   // We don't have to worry about East Asian fonts with locale-dependent
  60   // names here.
  61   return wcscmp(font_name, actual_font_name) == 0;
  62 }
  63
  64 class OverrideLocaleHolder {
  65  public:
  66   OverrideLocaleHolder() {}
  67   const std::vector<std::string>& value() const { return value_; }
  68   void swap_value(std::vector<std::string>* override_value) {
  69     value_.swap(*override_value);
  70   }
  71  private:
  72   std::vector<std::string> value_;
  73   DISALLOW_COPY_AND_ASSIGN(OverrideLocaleHolder);
  74 };
  75
  76 base::LazyInstance<OverrideLocaleHolder> override_locale_holder =
  77     LAZY_INSTANCE_INITIALIZER;
  78
  79 }  // namespace
  80
  81 namespace l10n_util {
  82
  83 int GetExtendedStyles() {
  84   return !base::i18n::IsRTL() ? 0 : WS_EX_LAYOUTRTL | WS_EX_RTLREADING;
  85 }
  86
  87 int GetExtendedTooltipStyles() {
  88   return !base::i18n::IsRTL() ? 0 : WS_EX_LAYOUTRTL;
  89 }
  90
  91 void HWNDSetRTLLayout(HWND hwnd) {
  92   DWORD ex_style = ::GetWindowLong(hwnd, GWL_EXSTYLE);
  93
  94   // We don't have to do anything if the style is already set for the HWND.
  95   if (!(ex_style & WS_EX_LAYOUTRTL)) {
  96     ex_style |= WS_EX_LAYOUTRTL;
  97     ::SetWindowLong(hwnd, GWL_EXSTYLE, ex_style);
  98
  99     // Right-to-left layout changes are not applied to the window immediately
 100     // so we should make sure a WM_PAINT is sent to the window by invalidating
 101     // the entire window rect.
 102     ::InvalidateRect(hwnd, NULL, true);
 103   }
 104 }
 105
 106 bool IsLocaleSupportedByOS(const std::string& locale) {
 107   // Block Amharic on Windows XP unless 'Abyssinica SIL' font is present.
 108   // On Win XP, no Ethiopic/Amahric font is availabel out of box. We hard-coded
 109   // 'Abyssinica SIL' in the resource bundle to use in the UI. Check
 110   // for its presence to determine whether or not to support Amharic UI on XP.
 111   return (base::win::GetVersion() >= base::win::VERSION_VISTA ||
 112       !LowerCaseEqualsASCII(locale, "am") || IsFontPresent(L"Abyssinica SIL"));
 113 }
 114
 115 bool NeedOverrideDefaultUIFont(string16* override_font_family,
 116                                double* font_size_scaler) {
 117   // This is rather simple-minded to deal with the UI font size
 118   // issue for some Indian locales (ml, bn, hi) for which
 119   // the default Windows fonts are too small to be legible.  For those
 120   // locales, IDS_UI_FONT_FAMILY is set to an actual font family to
 121   // use while for other locales, it's set to 'default'.
 122
 123   // XP and Vista or later have different font size issues and
 124   // we need separate ui font specifications.
 125   int ui_font_family_id = IDS_UI_FONT_FAMILY;
 126   int ui_font_size_scaler_id = IDS_UI_FONT_SIZE_SCALER;
 127   if (base::win::GetVersion() < base::win::VERSION_VISTA) {
 128     ui_font_family_id = IDS_UI_FONT_FAMILY_XP;
 129     ui_font_size_scaler_id = IDS_UI_FONT_SIZE_SCALER_XP;
 130   }
 131
 132   string16 ui_font_family = GetStringUTF16(ui_font_family_id);
 133   int scaler100;
 134   if (!base::StringToInt(l10n_util::GetStringUTF16(ui_font_size_scaler_id),
 135                          &scaler100))
 136     return false;
 137
 138   // We use the OS default in two cases:
 139   // 1) The resource bundle has 'default' and '100' for font family and
 140   //    font scaler.
 141   // 2) The resource bundle is not available for some reason and
 142   //    ui_font_family is empty.
 143   if (ui_font_family == L"default" && scaler100 == 100 ||
 144       ui_font_family.empty())
 145     return false;
 146   if (override_font_family && font_size_scaler) {
 147     override_font_family->swap(ui_font_family);
 148     *font_size_scaler = scaler100 / 100.0;
 149   }
 150   return true;
 151 }
 152
 153 void AdjustUIFont(LOGFONT* logfont) {
 154 #if defined(ENABLE_HIDPI)
 155   float dpi_scale = ui::GetDPIScale();
 156 #else
 157   float dpi_scale = 1;
 158 #endif
 159   AdjustUIFontForDIP(dpi_scale, logfont);
 160 }
 161
 162 void AdjustUIFontForDIP(float dpi_scale, LOGFONT* logfont) {
 163   string16 ui_font_family = L"default";
 164   double ui_font_size_scaler = 1;
 165   if (NeedOverrideDefaultUIFont(&ui_font_family, &ui_font_size_scaler) ||
 166       dpi_scale != 1) {
 167     AdjustLogFont(ui_font_family, ui_font_size_scaler, dpi_scale, logfont);
 168   }
 169 }
 170
 171 void AdjustUIFontForWindow(HWND hwnd) {
 172   string16 ui_font_family;
 173   double ui_font_size_scaler;
 174   if (NeedOverrideDefaultUIFont(&ui_font_family, &ui_font_size_scaler)) {
 175     LOGFONT logfont;
 176     if (GetObject(GetWindowFont(hwnd), sizeof(logfont), &logfont)) {
 177       double dpi_scale = 1;
 178       AdjustLogFont(ui_font_family, ui_font_size_scaler, dpi_scale, &logfont);
 179       HFONT hfont = CreateFontIndirect(&logfont);
 180       if (hfont)
 181         SetWindowFont(hwnd, hfont, FALSE);
 182     }
 183   }
 184 }
 185
 186 void OverrideLocaleWithUILanguageList() {
 187   std::vector<std::wstring> ui_languages;
 188   if (base::win::i18n::GetThreadPreferredUILanguageList(&ui_languages)) {
 189     std::vector<std::string> ascii_languages;
 190     ascii_languages.reserve(ui_languages.size());
 191     std::transform(ui_languages.begin(), ui_languages.end(),
 192                    std::back_inserter(ascii_languages), &WideToASCII);
 193     override_locale_holder.Get().swap_value(&ascii_languages);
 194   } else {
 195     NOTREACHED() << "Failed to determine the UI language for locale override.";
 196   }
 197 }
 198
 199 const std::vector<std::string>& GetLocaleOverrides() {
 200   return override_locale_holder.Get().value();
 201 }
 202
 203 }  // namespace l10n_util