Small utility class for loading custom fonts on Symbian

SymbianFontLoader.h

/*
    Juha Turunen (turunen@iki.fi), 2010
    Use freely in any commercial or non-commercial way. All rights waived.
    More Qt/QtQuick/Symbian stuff at: http://www.juhaturunen.com/blog/

    Instructions:

    - You need to link to a few Symbian DLLs. Add this line to your applications .pro file:
        symbian { LIBS += -lcone -lws32 -lbafl -legul }
    - Deploy your font files to a place where the Symbian font and bitmap server can read them.
      \resources\<your application UID>\ would be a good place. Do NOT deploy to \resources\fonts
      (causes trouble during uninstall of your app) or your application's private directory (Symbian
      FBS can't access the file).
    - If you expect your app to be frequently used and want to shave a few milliseconds from the startup,
      use the constructor parameter retainFonts. If a true value is provided, the fonts will not be released
      when your application terminates.
    - Use Symbian style paths with backslashes e.g. c:\directory\file.txt
    - Example usage:
        #ifdef Q_OS_SYMBIAN
        #include "SymbianFontLoader.h"
        #endif Q_OS_SYMBIAN

        int main(int argc, char *argv[])
        {
            QApplication a(argc, argv);
        #ifdef Q_OS_SYMBIAN
            SymbianFontLoader fontLoader(true);
            fontLoader.load("c:\\resources\\DEADBEEF\\perkelica.ttf");

            // In case you're interested which fonts are installed
            qDebug() << fontLoader.loadedFonts();
        #endif
            // Rest of your stuff here
            return a.exec();
        }

*/

#ifndef SYMBIANFONTLOADER_H
#define SYMBIANFONTLOADER_H

#include <QString>
#include <coemain.h>
#include <w32std.h>
#include <badesca.h>
#include <gulutil.h>

class SymbianFontLoader
{
public:
    SymbianFontLoader(bool retainFonts = false) {
        m_retainFonts = retainFonts;
        m_screenDevice = CCoeEnv::Static()->ScreenDevice();
    }

    ~SymbianFontLoader() {
        if (!m_retainFonts)
            foreach(int id, m_fontIds)
                m_screenDevice->RemoveFile(id);
    }

    QStringList loadedFonts() {
        QStringList fonts;
        TRAPD(err, listFontsL(fonts));
        qt_symbian_throwIfError(err);
        return fonts;
    }

    void load(QString path) {
        TPtrC fontFile(path.utf16(), path.length());
        int fontId;
        int err = m_screenDevice->AddFile(fontFile, fontId);
        qt_symbian_throwIfError(err);
        if (!m_retainFonts)
            m_fontIds << fontId;
    }

private:
    void listFontsL(QStringList& fonts) {
        CDesCArrayFlat *fontNames = new (ELeave) CDesCArrayFlat(5);
        CleanupStack::PushL(fontNames);
        FontUtils::GetAvailableFontsL(*m_screenDevice, *fontNames, EGulAllFonts);
        int fontCount = fontNames->Length();
        for (int i=0; i < fontCount; i++) {
            TPtrC fontName = fontNames->MdcaPoint(i);
            QString font = QString::fromUtf16(fontName.Ptr(), fontName.Length());
            fonts << font;
        }
        CleanupStack::PopAndDestroy();
    }

private:
    CWsScreenDevice* m_screenDevice;
    bool m_retainFonts;
    QList<int> m_fontIds;
};

#endif // SYMBIANFONTLOADER_H