subsurface/desktop-widgets/preferences/preferences_language.cpp

#include "preferences_language.h"
#include "ui_prefs_language.h"

#include <QApplication>
#include <QSettings>
#include <QMessageBox>
#include <QSortFilterProxyModel>

#include "qt-models/models.h"

PreferencesLanguage::PreferencesLanguage() : AbstractPreferencesWidget(tr("Language"), QIcon(":/language"), 4)
{
	ui = new Ui::PreferencesLanguage();
	ui->setupUi(this);

	QSortFilterProxyModel *filterModel = new QSortFilterProxyModel();
	filterModel->setSourceModel(LanguageModel::instance());
	filterModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
	ui->languageDropdown->setModel(filterModel);
	filterModel->sort(0);
	connect(ui->languageFilter, &QLineEdit::textChanged,
			filterModel, &QSortFilterProxyModel::setFilterFixedString);
}

PreferencesLanguage::~PreferencesLanguage()
{
	delete ui;
}

void PreferencesLanguage::refreshSettings()
{
	QSettings s;
	s.beginGroup("Language");
	ui->languageSystemDefault->setChecked(s.value("UseSystemLanguage", true).toBool());
	QAbstractItemModel *m = ui->languageDropdown->model();
	QModelIndexList languages = m->match(m->index(0, 0), Qt::UserRole, s.value("UiLanguage").toString());
	if (languages.count())
		ui->languageDropdown->setCurrentIndex(languages.first().row());
	s.endGroup();
}

void PreferencesLanguage::syncSettings()
{
	QSettings s;
	s.beginGroup("Language");
	bool useSystemLang = s.value("UseSystemLanguage", true).toBool();
	QAbstractItemModel *m = ui->languageDropdown->model();
	QString currentText = m->data(m->index(ui->languageDropdown->currentIndex(),0), Qt::UserRole).toString();
	if (useSystemLang != ui->languageSystemDefault->isChecked() ||
	    (!useSystemLang && s.value("UiLanguage").toString() != currentText)) {
		QMessageBox::warning(this, tr("Restart required"),
			tr("To correctly load a new language you must restart Subsurface."));
	}
	s.setValue("UseSystemLanguage", ui->languageSystemDefault->isChecked());
	s.setValue("UiLanguage", currentText);
	s.endGroup();
}