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/strings/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/gfx/display.h"
  19 #include "ui/gfx/win/dpi.h"
  20
  21 namespace {
  22
  23 void AdjustLogFont(const base::string16& font_family,
  24                    double font_size_scaler,
  25                    double dpi_scale,
  26                    LOGFONT* logfont) {
  27   DCHECK(font_size_scaler > 0);
  28   font_size_scaler = std::max(std::min(font_size_scaler, 2.0), 0.7);
  29   // Font metrics are computed in pixels and scale in high-DPI mode.
  30   // Normalized by the DPI scale factor in order to work in DIP with
  31   // Views/Aura. Call with dpi_scale=1 to keep the size in pixels.
  32   font_size_scaler /= dpi_scale;
  33   logfont->lfHeight = static_cast<long>(font_size_scaler *
  34       static_cast<double>(abs(logfont->lfHeight)) + 0.5) *
  35       (logfont->lfHeight > 0 ? 1 : -1);
  36
  37   // TODO(jungshik): We may want to check the existence of the font.
  38   // If it's not installed, we shouldn't adjust the font.
  39   if (font_family != L"default") {
  40     int name_len = std::min(static_cast<int>(font_family.size()),
  41                             LF_FACESIZE -1);
  42     memcpy(logfont->lfFaceName, font_family.data(), name_len * sizeof(WORD));
  43     logfont->lfFaceName[name_len] = 0;
  44   }
  45 }
  46
  47 bool IsFontPresent(const wchar_t* font_name) {
  48   HFONT hfont = CreateFont(12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  49                            font_name);
  50   if (hfont == NULL)
  51     return false;
  52   HDC dc = GetDC(0);
  53   HGDIOBJ oldFont = static_cast<HFONT>(SelectObject(dc, hfont));
  54   WCHAR actual_font_name[LF_FACESIZE];
  55   DWORD size_ret = GetTextFace(dc, LF_FACESIZE, actual_font_name);
  56   actual_font_name[LF_FACESIZE - 1] = 0;
  57   SelectObject(dc, oldFont);
  58   DeleteObject(hfont);
  59   ReleaseDC(0, dc);
  60   // We don't have to worry about East Asian fonts with locale-dependent
  61   // names here.
  62   return wcscmp(font_name, actual_font_name) == 0;
  63 }
  64
  65 class OverrideLocaleHolder {
  66  public:
  67   OverrideLocaleHolder() {}
  68   const std::vector<std::string>& value() const { return value_; }
  69   void swap_value(std::vector<std::string>* override_value) {
  70     value_.swap(*override_value);
  71   }
  72  private:
  73   std::vector<std::string> value_;
  74   DISALLOW_COPY_AND_ASSIGN(OverrideLocaleHolder);
  75 };
  76
  77 base::LazyInstance<OverrideLocaleHolder> override_locale_holder =
  78     LAZY_INSTANCE_INITIALIZER;
  79
  80 }  // namespace
  81
  82 namespace l10n_util {
  83
  84 int GetExtendedStyles() {
  85   return !base::i18n::IsRTL() ? 0 : WS_EX_LAYOUTRTL | WS_EX_RTLREADING;
  86 }
  87
  88 int GetExtendedTooltipStyles() {
  89   return !base::i18n::IsRTL() ? 0 : WS_EX_LAYOUTRTL;
  90 }
  91
  92 void HWNDSetRTLLayout(HWND hwnd) {
  93   DWORD ex_style = ::GetWindowLong(hwnd, GWL_EXSTYLE);
  94
  95   // We don't have to do anything if the style is already set for the HWND.
  96   if (!(ex_style & WS_EX_LAYOUTRTL)) {
  97     ex_style |= WS_EX_LAYOUTRTL;
  98     ::SetWindowLong(hwnd, GWL_EXSTYLE, ex_style);
  99
 100     // Right-to-left layout changes are not applied to the window immediately
 101     // so we should make sure a WM_PAINT is sent to the window by invalidating
 102     // the entire window rect.
 103     ::InvalidateRect(hwnd, NULL, true);
 104   }
 105 }
 106
 107 bool IsLocaleSupportedByOS(const std::string& locale) {
 108   // Block Amharic on Windows XP unless 'Abyssinica SIL' font is present.
 109   // On Win XP, no Ethiopic/Amahric font is availabel out of box. We hard-coded
 110   // 'Abyssinica SIL' in the resource bundle to use in the UI. Check
 111   // for its presence to determine whether or not to support Amharic UI on XP.
 112   return (base::win::GetVersion() >= base::win::VERSION_VISTA ||
 113       !LowerCaseEqualsASCII(locale, "am") || IsFontPresent(L"Abyssinica SIL"));
 114 }
 115
 116 bool NeedOverrideDefaultUIFont(base::string16* override_font_family,
 117                                double* font_size_scaler) {
 118   // This is rather simple-minded to deal with the UI font size
 119   // issue for some Indian locales (ml, bn, hi) for which
 120   // the default Windows fonts are too small to be legible.  For those
 121   // locales, IDS_UI_FONT_FAMILY is set to an actual font family to
 122   // use while for other locales, it's set to 'default'.
 123
 124   // XP and Vista or later have different font size issues and
 125   // we need separate ui font specifications.
 126   int ui_font_family_id = IDS_UI_FONT_FAMILY;
 127   int ui_font_size_scaler_id = IDS_UI_FONT_SIZE_SCALER;
 128   if (base::win::GetVersion() < base::win::VERSION_VISTA) {
 129     ui_font_family_id = IDS_UI_FONT_FAMILY_XP;
 130     ui_font_size_scaler_id = IDS_UI_FONT_SIZE_SCALER_XP;
 131   }
 132
 133   base::string16 ui_font_family = GetStringUTF16(ui_font_family_id);
 134   int scaler100;
 135   if (!base::StringToInt(l10n_util::GetStringUTF16(ui_font_size_scaler_id),
 136                          &scaler100))
 137     return false;
 138
 139   // We use the OS default in two cases:
 140   // 1) The resource bundle has 'default' and '100' for font family and
 141   //    font scaler.
 142   // 2) The resource bundle is not available for some reason and
 143   //    ui_font_family is empty.
 144   if (ui_font_family == L"default" && scaler100 == 100 ||
 145       ui_font_family.empty())
 146     return false;
 147   if (override_font_family && font_size_scaler) {
 148     override_font_family->swap(ui_font_family);
 149     *font_size_scaler = scaler100 / 100.0;
 150   }
 151   return true;
 152 }
 153
 154 void AdjustUIFont(LOGFONT* logfont) {
 155   double dpi_scale = gfx::GetDPIScale();
 156   if (gfx::Display::HasForceDeviceScaleFactor()) {
 157     // If the scale is forced, we don't need to adjust it here.
 158     dpi_scale = 1.0;
 159   }
 160   AdjustUIFontForDIP(dpi_scale, logfont);
 161 }
 162
 163 void AdjustUIFontForDIP(float dpi_scale, LOGFONT* logfont) {
 164   base::string16 ui_font_family = L"default";
 165   double ui_font_size_scaler = 1;
 166   if (NeedOverrideDefaultUIFont(&ui_font_family, &ui_font_size_scaler) ||
 167       dpi_scale != 1) {
 168     AdjustLogFont(ui_font_family, ui_font_size_scaler, dpi_scale, logfont);
 169   }
 170 }
 171
 172 void AdjustUIFontForWindow(HWND hwnd) {
 173   base::string16 ui_font_family;
 174   double ui_font_size_scaler;
 175   if (NeedOverrideDefaultUIFont(&ui_font_family, &ui_font_size_scaler)) {
 176     LOGFONT logfont;
 177     if (GetObject(GetWindowFont(hwnd), sizeof(logfont), &logfont)) {
 178       double dpi_scale = 1;
 179       AdjustLogFont(ui_font_family, ui_font_size_scaler, dpi_scale, &logfont);
 180       HFONT hfont = CreateFontIndirect(&logfont);
 181       if (hfont)
 182         SetWindowFont(hwnd, hfont, FALSE);
 183     }
 184   }
 185 }
 186
 187 void OverrideLocaleWithUILanguageList() {
 188   std::vector<std::wstring> ui_languages;
 189   if (base::win::i18n::GetThreadPreferredUILanguageList(&ui_languages)) {
 190     std::vector<std::string> ascii_languages;
 191     ascii_languages.reserve(ui_languages.size());
 192     std::transform(ui_languages.begin(), ui_languages.end(),
 193                    std::back_inserter(ascii_languages), &WideToASCII);
 194     override_locale_holder.Get().swap_value(&ascii_languages);
 195   } else {
 196     NOTREACHED() << "Failed to determine the UI language for locale override.";
 197   }
 198 }
 199
 200 const std::vector<std::string>& GetLocaleOverrides() {
 201   return override_locale_holder.Get().value();
 202 }
 203
 204 }  // namespace l10n_util