/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the examples of the Qt Toolkit.

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#include <QtGui>

#include "languagechooser.h"

#include "mainwindow.h"

#ifdef Q_WS_MAC

QT_BEGIN_NAMESPACE

extern void qt_mac_set_menubar_merge(bool merge);

QT_END_NAMESPACE

#endif

LanguageChooser::LanguageChooser(QWidget *parent)

    : QDialog(parent, Qt::WindowStaysOnTopHint)

{

    groupBox = new QGroupBox("Languages");

    QGridLayout *groupBoxLayout = new QGridLayout;

    QStringList qmFiles = findQmFiles();

    for (int i = 0; i < qmFiles.size(); ++i) {

        QCheckBox *checkBox = new QCheckBox(languageName(qmFiles[i]));

        qmFileForCheckBoxMap.insert(checkBox, qmFiles[i]);

        connect(checkBox, SIGNAL(toggled(bool)), this, SLOT(checkBoxToggled()));

        groupBoxLayout->addWidget(checkBox, i / 2, i % 2);

    }

    groupBox->setLayout(groupBoxLayout);

    buttonBox = new QDialogButtonBox;

    showAllButton = buttonBox->addButton("Show All",

                                         QDialogButtonBox::ActionRole);

    hideAllButton = buttonBox->addButton("Hide All",

                                         QDialogButtonBox::ActionRole);

    connect(showAllButton, SIGNAL(clicked()), this, SLOT(showAll()));

    connect(hideAllButton, SIGNAL(clicked()), this, SLOT(hideAll()));

    QVBoxLayout *mainLayout = new QVBoxLayout;

    mainLayout->addWidget(groupBox);

    mainLayout->addWidget(buttonBox);

    setLayout(mainLayout);

#ifdef Q_WS_MAC

    qt_mac_set_menubar_merge(false);

#endif

    setWindowTitle("I18N");

}

bool LanguageChooser::eventFilter(QObject *object, QEvent *event)

{

    if (event->type() == QEvent::Close) {

        MainWindow *window = qobject_cast<MainWindow *>(object);

        if (window) {

            QCheckBox *checkBox = mainWindowForCheckBoxMap.key(window);

            if (checkBox)

                checkBox->setChecked(false);

        }

    }

    return QWidget::eventFilter(object, event);

}

void LanguageChooser::closeEvent(QCloseEvent * /* event */)

{

    qApp->quit();

}

void LanguageChooser::checkBoxToggled()

{

    QCheckBox *checkBox = qobject_cast<QCheckBox *>(sender());

    MainWindow *window = mainWindowForCheckBoxMap[checkBox];

    if (!window) {

        QTranslator translator;

        translator.load(qmFileForCheckBoxMap[checkBox]);

        qApp->installTranslator(&translator);

        window = new MainWindow;

        window->setPalette(colorForLanguage(checkBox->text()));

        window->installEventFilter(this);

        mainWindowForCheckBoxMap.insert(checkBox, window);

    }

    window->setVisible(checkBox->isChecked());

}

void LanguageChooser::showAll()

{

    foreach (QCheckBox *checkBox, qmFileForCheckBoxMap.keys())

        checkBox->setChecked(true);

}

void LanguageChooser::hideAll()

{

    foreach (QCheckBox *checkBox, qmFileForCheckBoxMap.keys())

        checkBox->setChecked(false);

}

QStringList LanguageChooser::findQmFiles()

{

    QDir dir(":/translations");

    QStringList fileNames = dir.entryList(QStringList("*.qm"), QDir::Files,

                                          QDir::Name);

    QMutableStringListIterator i(fileNames);

    while (i.hasNext()) {

        i.next();

        i.setValue(dir.filePath(i.value()));

    }

    return fileNames;

}

QString LanguageChooser::languageName(const QString &qmFile)

{

    QTranslator translator;

    translator.load(qmFile);

    return translator.translate("MainWindow", "English");

}

QColor LanguageChooser::colorForLanguage(const QString &language)

{

    uint hashValue = qHash(language);

    int red = 156 + (hashValue & 0x3F);

    int green = 156 + ((hashValue >> 6) & 0x3F);

    int blue = 156 + ((hashValue >> 12) & 0x3F);

    return QColor(red, green, blue);

}