QtHelper.h

/*=======================================================================
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 **=======================================================================*/
/*=======================================================================
** Author      : VSG (MMM YYYY)
**=======================================================================*/
 
#pragma once
 
#include <QCoreApplication>
#include <QFile>
#include <QString>
 
#include <Inventor/SoPreferences.h>
#include <Inventor/helpers/SbFileHelper.h>
#include <Inventor/sys/SoDynamicLibManager.h>
 
class QtHelper
{
public:
  static void
  addPlatformPluginsPath( QString path = "" )
  {
    // if the QApplication alraady exists, we can safely assume everything is in order
    // if there is a qt.conf file, we do not want to apply our library path modifications
    // as we should trust the qt.conf to do everything that is required.
    const bool qtconfExists = QFile::exists( "qt.conf" );
    if ( qApp || qtconfExists )
      return;
 
    if ( SoPreferences::getString( "QT_QPA_PLATFORM_PLUGIN_PATH", "" ).isEmpty() )
    {
      if ( path.isEmpty() )
      {
        // Try to guess QT platforms path from Open Inventor binaries path
        const QString pluginPath = qtPluginsPath();
        if ( SbFileHelper::isAccessible( pluginPath.toStdString() ) )
        {
          QCoreApplication::addLibraryPath( pluginPath );
        }
      }
      else
      {
        QCoreApplication::addLibraryPath( path );
      }
    }
  }
 
  static QString
  qtPluginsPath()
  {
    const SbString binariesPath = SoDynamicLibManager::getLibraryFromSymbol( ( void* )SoInventorBase::init );
    const QString qtPlatformsPath = SbFileHelper::toUnixPath( SbFileHelper::getDirName( binariesPath ) + "qtplugins/" ).toStdString().c_str();
    return qtPlatformsPath;
  }
};