gecko-dev/browser/components/preferences/fonts.js

/* -*- indent-tabs-mode: nil; js-indent-level: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* import-globals-from ../../../toolkit/mozapps/preferences/fontbuilder.js */

// browser.display.languageList LOCK ALL when LOCKED

const kDefaultFontType          = "font.default.%LANG%";
const kFontNameFmtSerif         = "font.name.serif.%LANG%";
const kFontNameFmtSansSerif     = "font.name.sans-serif.%LANG%";
const kFontNameFmtMonospace     = "font.name.monospace.%LANG%";
const kFontNameListFmtSerif     = "font.name-list.serif.%LANG%";
const kFontNameListFmtSansSerif = "font.name-list.sans-serif.%LANG%";
const kFontNameListFmtMonospace = "font.name-list.monospace.%LANG%";
const kFontSizeFmtVariable      = "font.size.variable.%LANG%";
const kFontSizeFmtFixed         = "font.size.fixed.%LANG%";
const kFontMinSizeFmt           = "font.minimum-size.%LANG%";

Preferences.addAll([
  { id: "font.language.group", type: "wstring" },
  { id: "browser.display.use_document_fonts", type: "int" },
  { id: "intl.charset.fallback.override", type: "string" },
]);

var gFontsDialog = {
  _selectLanguageGroupPromise: Promise.resolve(),

  _selectLanguageGroup(aLanguageGroup) {
    this._selectLanguageGroupPromise = (async () => {
      // Avoid overlapping language group selections by awaiting the resolution
      // of the previous one.  We do this because this function is re-entrant,
      // as inserting <preference> elements into the DOM sometimes triggers a call
      // back into this function.  And since this function is also asynchronous,
      // that call can enter this function before the previous run has completed,
      // which would corrupt the font menulists.  Awaiting the previous call's
      // resolution avoids that fate.
      await this._selectLanguageGroupPromise;

      var prefs = [
        { format: kDefaultFontType,          type: "string",   element: "defaultFontType", fonttype: null     },
        { format: kFontNameFmtSerif,         type: "fontname", element: "serif",      fonttype: "serif"       },
        { format: kFontNameFmtSansSerif,     type: "fontname", element: "sans-serif", fonttype: "sans-serif"  },
        { format: kFontNameFmtMonospace,     type: "fontname", element: "monospace",  fonttype: "monospace"   },
        { format: kFontNameListFmtSerif,     type: "unichar",  element: null,         fonttype: "serif"       },
        { format: kFontNameListFmtSansSerif, type: "unichar",  element: null,         fonttype: "sans-serif"  },
        { format: kFontNameListFmtMonospace, type: "unichar",  element: null,         fonttype: "monospace"   },
        { format: kFontSizeFmtVariable,      type: "int",      element: "sizeVar",    fonttype: null          },
        { format: kFontSizeFmtFixed,         type: "int",      element: "sizeMono",   fonttype: null          },
        { format: kFontMinSizeFmt,           type: "int",      element: "minSize",    fonttype: null          }
      ];
      for (var i = 0; i < prefs.length; ++i) {
        var name = prefs[i].format.replace(/%LANG%/, aLanguageGroup);
        var preference = Preferences.get(name);
        if (!preference) {
          preference = Preferences.add({ id: name, type: prefs[i].type });
        }

        if (!prefs[i].element)
          continue;

        var element = document.getElementById(prefs[i].element);
        if (element) {
          element.setAttribute("preference", preference.id);

          if (prefs[i].fonttype)
            await FontBuilder.buildFontList(aLanguageGroup, prefs[i].fonttype, element);

          preference.setElementValue(element);
        }
      }
    })()
      .catch(Cu.reportError);
  },

  readFontLanguageGroup() {
    var languagePref = Preferences.get("font.language.group");
    this._selectLanguageGroup(languagePref.value);
    return undefined;
  },

  readUseDocumentFonts() {
    var preference = Preferences.get("browser.display.use_document_fonts");
    return preference.value == 1;
  },

  writeUseDocumentFonts() {
    var useDocumentFonts = document.getElementById("useDocumentFonts");
    return useDocumentFonts.checked ? 1 : 0;
  },

  async confirmMinSizeChange() {
    let menulist = document.getElementById("minSize");
    let preference = menulist.getAttribute("preference");
    let defaultValue = Preferences.get(preference).valueFromPreferences;
    let oldValue = Preferences.get(preference).value;
    let newValue = menulist.value;

    if (newValue <= 24 || newValue == defaultValue) {
      return;
    }

    let [title, warningMessage, confirmLabel] = await document.l10n.formatValues([
      {id: "fonts-very-large-warning-title"},
      {id: "fonts-very-large-warning-message"},
      {id: "fonts-very-large-warning-accept"},
    ]);
    let {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm", {});
    let flags = Services.prompt.BUTTON_POS_1 * Services.prompt.BUTTON_TITLE_CANCEL |
                Services.prompt.BUTTON_POS_0 * Services.prompt.BUTTON_TITLE_IS_STRING |
                Services.prompt.BUTTON_POS_1_DEFAULT;
    let buttonChosen = Services.prompt.confirmEx(window, title, warningMessage, flags, confirmLabel, null, "", "", {});
    if (buttonChosen != 0) {
      menulist.value = oldValue;
    }
  },
};