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[welcome] Refactor the code that picks a locale to use

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- Much like std::find_if, but slightly muddled because there's
   no iterator that we can sensibly use.
 - Scan the ComboBox for a locale that matches a predicate.
 - Log more as the search for a good locale progresses.
 - Don't mix matching the locale with filling the ComboBox
   (even though that's slightly more efficient).
main
Adriaan de Groot 7 years ago
parent 522adf766a
commit 4b7465696d
1 changed files with 75 additions and 59 deletions
Show Stats Download Patch File Download Diff File

134
src/modules/welcome/WelcomePage.cpp
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@ -106,90 +106,106 @@ WelcomePage::WelcomePage( RequirementsChecker* requirementsChecker, QWidget* par
}
/** @brief Match the combobox of languages with a predicate
*
* Scans the entries in the @p list (actually a ComboBox) and if one
* matches the given @p predicate, returns true and sets @p matchFound
* to the locale that matched.
*
* If none match, returns false and leaves @p matchFound unchanged.
*/
static
bool matchLocale( QComboBox& list, QLocale& matchFound, std::function<bool(const QLocale&)> predicate)
{
for (int i = 0; i < list.count(); i++)
{
QLocale thisLocale = list.itemData( i, Qt::UserRole ).toLocale();
if ( predicate(thisLocale) )
{
list.setCurrentIndex( i );
cDebug() << " .. Matched locale " << thisLocale.name();
matchFound = thisLocale;
return true;
}
}
return false;
}
void
WelcomePage::initLanguages()
{
ui->languageWidget->setInsertPolicy( QComboBox::InsertAlphabetically );
QLocale defaultLocale = QLocale( QLocale::system().name() );
{
bool isTranslationAvailable = false;
// Fill the list of translations
{
const auto locales = QString( CALAMARES_TRANSLATION_LANGUAGES ).split( ';');
for ( const QString& locale : locales )
{
QLocale thisLocale = QLocale( locale );
QString lang = QLocale::languageToString( thisLocale.language() );
if ( QLocale::countriesForLanguage( thisLocale.language() ).count() > 2 )
lang.append( QString( " (%1)" )
.arg( QLocale::countryToString( thisLocale.country() ) ) );
ui->languageWidget->addItem( lang, thisLocale );
if ( thisLocale.language() == defaultLocale.language() &&
thisLocale.country() == defaultLocale.country() )
{
isTranslationAvailable = true;
ui->languageWidget->setCurrentIndex( ui->languageWidget->count() - 1 );
cDebug() << "Initial locale " << thisLocale.name();
CalamaresUtils::installTranslator( thisLocale.name(),
Calamares::Branding::instance()->translationsPathPrefix(),
qApp );
}
}
}
if ( !isTranslationAvailable )
{
for (int i = 0; i < ui->languageWidget->count(); i++)
{
QLocale thisLocale = ui->languageWidget->itemData( i, Qt::UserRole ).toLocale();
if ( thisLocale.language() == defaultLocale.language() )
{
isTranslationAvailable = true;
ui->languageWidget->setCurrentIndex( i );
cDebug() << "Initial locale " << thisLocale.name();
CalamaresUtils::installTranslator( thisLocale.name(),
Calamares::Branding::instance()->translationsPathPrefix(),
qApp );
break;
}
}
}
// Find the best initial translation
QLocale selectedLocale;
if ( !isTranslationAvailable )
{
for (int i = 0; i < ui->languageWidget->count(); i++)
{
QLocale thisLocale = ui->languageWidget->itemData( i, Qt::UserRole ).toLocale();
if ( thisLocale == QLocale( QLocale::English, QLocale::UnitedStates ) )
{
isTranslationAvailable = true;
ui->languageWidget->setCurrentIndex( i );
cDebug() << "Translation unavailable, so initial locale set to " << thisLocale.name();
QLocale::setDefault( thisLocale );
CalamaresUtils::installTranslator( thisLocale.name(),
Calamares::Branding::instance()->translationsPathPrefix(),
qApp );
break;
}
}
}
cDebug() << "Matching exact locale" << defaultLocale;
bool isTranslationAvailable =
matchLocale( *(ui->languageWidget), selectedLocale,
[&](const QLocale& x){ return x.language() == defaultLocale.language() && x.country() == defaultLocale.country(); } );
if ( !isTranslationAvailable )
cWarning() << "No available translation matched" << defaultLocale;
if ( !isTranslationAvailable )
{
cDebug() << "Matching approximate locale" << defaultLocale.language();
connect( ui->languageWidget,
static_cast< void ( QComboBox::* )( int ) >( &QComboBox::currentIndexChanged ),
this, [ & ]( int newIndex )
{
QLocale selectedLocale = ui->languageWidget->itemData( newIndex, Qt::UserRole ).toLocale();
cDebug() << "Selected locale" << selectedLocale.name();
isTranslationAvailable =
matchLocale( *(ui->languageWidget), selectedLocale,
[&](const QLocale& x){ return x.language() == defaultLocale.language(); } ) ;
}
if ( !isTranslationAvailable )
{
QLocale en_us( QLocale::English, QLocale::UnitedStates );
cDebug() << "Matching English (US)";
isTranslationAvailable =
matchLocale( *(ui->languageWidget), selectedLocale,
[&](const QLocale& x){ return x == en_us; } );
// Now, if it matched, because we didn't match the system locale, switch to the one found
if ( isTranslationAvailable )
QLocale::setDefault( selectedLocale );
CalamaresUtils::installTranslator( selectedLocale,
Calamares::Branding::instance()->translationsPathPrefix(),
qApp );
} );
}
if ( isTranslationAvailable )
CalamaresUtils::installTranslator( selectedLocale.name(),
Calamares::Branding::instance()->translationsPathPrefix(),
qApp );
else
cWarning() << "No available translation matched" << defaultLocale;
connect( ui->languageWidget,
static_cast< void ( QComboBox::* )( int ) >( &QComboBox::currentIndexChanged ),
this,
[&]( int newIndex )
{
QLocale selectedLocale = ui->languageWidget->itemData( newIndex, Qt::UserRole ).toLocale();
cDebug() << "Selected locale" << selectedLocale.name();
QLocale::setDefault( selectedLocale );
CalamaresUtils::installTranslator( selectedLocale,
Calamares::Branding::instance()->translationsPathPrefix(),
qApp );
} );
}

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