Notification when changes in the keyboard language

On two physical keyboard devices and devices to contact user can change the language or the keyboard (i.e. the input language). Is there a way to the running application to detect when such a change happens?

Any help is greatly appreciated.

I don't think that BPS has this info anywhere, here how get it instead of the PPS.

Don't forget to add some LIBS +=-lbb to your pro file.

You can reuse the class PpsWatch for any other purpose PPS incidentally, my app "File System" allows you to navigate to the folder MAP to discover the various objects available PPS, or you can also use your BlackBerry browser and copy - paste this url:

file:///PPS/

// applicationui.cpp

#include "applicationui.hpp"

#include 
#include 
#include 
#include 

#include 

using namespace bb::cascades;

ApplicationUI::ApplicationUI() :
        QObject()
{
    // Don't forget to add LIBS += -lbb to your pro file
    m_ppsWatch = new PpsWatch("/pps/services/input/options", this);
    connect(m_ppsWatch, SIGNAL(logMessage(const QString&)), this, SLOT(onLogMessage(const QString&)));
    connect(m_ppsWatch, SIGNAL(ppsFileReady(const QVariantMap&)), this, SLOT(onPpsFileReady(const QVariantMap&)));

    // prepare the localization
    m_pTranslator = new QTranslator(this);
    m_pLocaleHandler = new LocaleHandler(this);

    bool res = QObject::connect(m_pLocaleHandler, SIGNAL(systemLanguageChanged()), this, SLOT(onSystemLanguageChanged()));
    // This is only available in Debug builds
    Q_ASSERT(res);
    // Since the variable is not used in the app, this is added to avoid a
    // compiler warning
    Q_UNUSED(res);

    // initial load
    onSystemLanguageChanged();

    // Create scene document from main.qml asset, the parent is set
    // to ensure the document gets destroyed properly at shut down.
    QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);

    // Create root object for the UI
    AbstractPane *root = qml->createRootObject();

    // Set created root object as the application scene
    Application::instance()->setScene(root);
}

void ApplicationUI::onLogMessage(const QString& message) {
    qDebug() << message;
}

void ApplicationUI::onPpsFileReady(const QVariantMap& ppsMap) {
    if (ppsMap.contains("languages.active_lang_layouts")) {
        QVariantMap active_lang_layouts = ppsMap["languages.active_lang_layouts"].toMap();
        QStringList locales = active_lang_layouts["locales"].toStringList();

        qDebug() << "Language list used right now:" << locales;
    }
}

void ApplicationUI::onSystemLanguageChanged()
{
    QCoreApplication::instance()->removeTranslator(m_pTranslator);
    // Initiate, load and install the application translation files.
    QString locale_string = QLocale().name();
    QString file_name = QString("KeyboardLanguage_%1").arg(locale_string);
    if (m_pTranslator->load(file_name, "app/native/qm")) {
        QCoreApplication::instance()->installTranslator(m_pTranslator);
    }
}

// applicationui.hpp

#ifndef ApplicationUI_HPP_
#define ApplicationUI_HPP_

#include 

#include 

namespace bb
{
    namespace cascades
    {
        class LocaleHandler;
    }
}

class QTranslator;

/*!
 * @brief Application UI object
 *
 * Use this object to create and init app UI, to create context objects, to register the new meta types etc.
 */
class ApplicationUI : public QObject
{
    Q_OBJECT
public:
    ApplicationUI();
    virtual ~ApplicationUI() {}

private slots:
    void onLogMessage(const QString& message);
    void onPpsFileReady(const QVariantMap& ppsMap);
    void onSystemLanguageChanged();

private:
    QTranslator* m_pTranslator;
    bb::cascades::LocaleHandler* m_pLocaleHandler;

    PpsWatch* m_ppsWatch;
};

#endif /* ApplicationUI_HPP_ */

/*
 * PpsWatch.cpp
 *
 *  Created on: 2015-06-05
 *      Author: Roger
 */

#include 
#include 

PpsWatch::PpsWatch(const QString& path, QObject *_parent) {
    emit logMessage("PpsWatch::PpsWatch()");

    if (_parent)
        this->setParent(_parent);

    m_path = path;
    m_mapTitle = "@" + path.split("/").last();

    m_ppsObject = new bb::PpsObject(path + "?wait,delta", this);
    connect(m_ppsObject, SIGNAL(readyRead()), this, SLOT(onPpsReadyRead()));

    if(!m_ppsObject->open(bb::PpsOpenMode::Subscribe)) {
        emit logMessage("Could not connect to " + path + " object: " + m_ppsObject->errorString());
    }
}

PpsWatch::~PpsWatch()
{
    emit logMessage("PpsWatch::~PpsWatch()");
    delete m_ppsObject;
    m_ppsObject = NULL;
}

void PpsWatch::changePath(const QString& path) {
    emit logMessage("PpsWatch::changePath() " + path);

    if (m_path == path) {
        emit logMessage("Same path as before, return");
        return;
    }

    m_path = path;
    m_mapTitle = "@" + path.split("/").last();

    if(!m_ppsObject->close()) {
        emit logMessage("Could not disconnect from " + m_ppsObject->objectName() + " object: " + m_ppsObject->errorString());
    }
    else {
        disconnect(m_ppsObject, SIGNAL(readyRead()), this, SLOT(onPpsReadyRead()));
    }

    m_ppsObject = new bb::PpsObject(path + "?wait,delta", this);
    connect(m_ppsObject, SIGNAL(readyRead()), this, SLOT(onPpsReadyRead()));

    if(!m_ppsObject->open(bb::PpsOpenMode::Subscribe)) {
        emit logMessage("Could not connect to " + path + " object: " + m_ppsObject->errorString());
    }
}

void PpsWatch::onPpsReadyRead() {
    emit logMessage("PpsWatch::onPpsReadyRead()");

    bool readOk;
    QByteArray data = m_ppsObject->read(&readOk);
    if(!readOk) { return; }

    bool decodeOk;
    const QVariantMap map = bb::PpsObject::decode(data, &decodeOk);
    if(!decodeOk) { return; }

    const QVariantMap ppsFile = map[m_mapTitle].toMap();
    if (ppsFile.isEmpty()) { return; }

    emit ppsFileReady(ppsFile);
}

/*
 * PpsWatch.h
 *
 *  Created on: 2015-06-05
 *      Author: Roger
 */

#ifndef PPSWATCH_H_
#define PPSWATCH_H_

#include 
#include 

class PpsWatch : public QObject
{
    Q_OBJECT

public:
    PpsWatch(const QString& path, QObject *_parent = 0);
    virtual ~PpsWatch();

    void changePath(const QString& path);

private slots:
    void onPpsReadyRead();

private:
    bb::PpsObject* m_ppsObject;

    QString m_path;
    QString m_mapTitle;

signals:
    void logMessage(const QString&);
    void ppsFileReady(const QVariantMap&);
};

#endif /* PPSWATCH_H_ */

Tags: BlackBerry Developers

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