SbQtHelper.h

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**=======================================================================*/
/*=======================================================================
** Author      : VSG (MMM YYYY)
**=======================================================================*/
 
#ifndef _SB_QT_HELPER
#define _SB_QT_HELPER
 
#include <QCoreApplication>
#include <QString>
#include <QFile>
#include <QWidget>
 
#include <Inventor/SoPreferences.h>
#include <Inventor/nodes/SoNode.h>
#include <Inventor/helpers/SbFileHelper.h>
#include <Inventor/sys/SoDynamicLibManager.h>
 
class SbQtHelper
{
public:
  static void addPlatformPluginsPath(SbString 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 SbString pluginPath = qtPluginsPath();
        if ( SbFileHelper::isAccessible(pluginPath) )
        {
          QCoreApplication::addLibraryPath( QString(pluginPath.getString()) );
        }
      }
      else
      {
        QCoreApplication::addLibraryPath( QString(path.getString()) );
      }
    }
  }
 
  static SbString qtPluginsPath()
  {
    const SbString binariesPath = SoDynamicLibManager::getLibraryFromSymbol((void*)SoInventorBase::init);
    const SbString qtPlatformsPath = SbFileHelper::toUnixPath(SbFileHelper::getDirName(binariesPath) + "qtplugins/");
    return qtPlatformsPath;
  }
 
  static float getDevicePixelRatio(QWidget* widget)
  {
    if (widget == nullptr || widget->windowHandle() == nullptr)
      return 1.f;
 
    return static_cast<float>( widget->devicePixelRatio() );
  }
 
};
 
#endif // SB_QT_HELPER