KDE Core/Platform 11/Locale

Locale

• http://community.kde.org/KDE_Core/KLocale
• http://community.kde.org/KDE_Core/ISO_Codes

What's wrong with KLocale:

• Gtk/Qt apps running under kde-workspace don't use the KDE locale
• KDE apps running under other platforms/workspaces do not use host locale
• Class merges settings, formatters, parsers and translations in one giant blob
• Circular dependencies with KConfig and KCalendarSystem
• Unnecessary dependency for Qt-Addon libraries

What's great about KLocale:

• Users can customise workspace locale settings
• Apps can customise locale settings
• Many advanced settings and formats not in QLocale (yet)

What's wrong with QLocale:

• Not all settings are supported
• Apps and users unable to change settings

What's good with QLocale:

• Uses host settings on all platforms
• Low-level common class so good for Qt Addons
• Some settings not yet in KDE

The Plan:

• Add all KDE settings that already exist in CLDR to QLocale
• Use QLocale to replace KLocale's role as settings container
  • Gives correct Windows, Mac, Gnome, Meego settings
• KDE Workspace to set locale envvar on login if KDE locale different to system locale
  • Gives correct locale Gtk/Qt apps
• KCM to load settings from QLocale, write out as both POSIX and CLDR format files only if user chooses different settings
  • locale envvar then set to absolute path to users POSIX file so all Gtk apps get right settings
  • QLocale loads CLDR(?) file so KDE/Qt apps get right settings
• Apps use parser/formatter classes/api's to alter settings for one-off calls rather than changing the locale itself, or create a whole new locale object.
• Settings not available in QLocale are used by formatter/parser classes

Big Questions:

• Date/Time formats: Keep POSIX formats (need own formatter/parser that translates Unicode format) or switch to Unicode format (not SC, QDateTime may not support all our features)
• How will QLocale load custom CLDR? Fallback to custom POSIX but lacks some settings.

What's missing in QLocale:

• ISO codes for language/country, uses enums instead
• Digit Sets
• Binary Formats
• Page Size
• Decimal Places
• Separate monetary number symbols (decimal, sign, etc) but that's a Unicode CLDR thing
• Monetary formatting options internal only not exposed
• ...

What's extra in QLocale:

• More locale metadata
• Script
• Quotes
• Lists
• More number symbols