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QtROOT a Qt interface to ROOT

QtROOT a Qt interface to ROOT. Denis Bertini GO4 GSI-Darmstadt 13/06/2001. Outline. Motivations QtROOT interface implementation use of general ROOT GUI Factory classes Integrating ROOT system events Ongoing work Conclusions. Motivations.

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QtROOT a Qt interface to ROOT

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  1. QtROOT a Qt interface to ROOT Denis Bertini GO4 GSI-Darmstadt 13/06/2001

  2. Outline • Motivations • QtROOT interface implementation • use of general ROOT GUI Factory classes • Integrating ROOT system events • Ongoing work • Conclusions Denis Bertini

  3. Motivations • To Give the ROOT user the opportunity to develop GUI application using together: • full embedded ROOT canvas functionality • full KDE/Qt cross-platform C++ class library • full ROOT functionality i.e ROOT system events available (TTimer, TSockets , TThread, ...) • CINT and Qt? • Visual design tool available : QtDesigner • compatible with QtROOT embedded canvas. Denis Bertini

  4. QtROOT components • Follows the general ROOT GUI ABC • no changes in ROOT source necessary • Inheritance from ROOT base classes • TQRootGuiFactory (TRootGuiFactory) • Qt Factory GUI components • TQCanvasImp (TCanvasImp) • creates a Qt independent main window (QMainWindow) • sets TQRootCanvas as a central widget • TQApplication (TApplication) • ROOT environment set with a Qt GUI factory • Inheritance from Qt base class • QRootApplication (QApplication) • enable Qt evt-loop to drive Qt based GUI applications • call ROOT inner loop repeatedly to enable ROOT system events Denis Bertini

  5. QtROOT UML Diagram Denis Bertini

  6. QtROOT GUI Factory • TQApplication • LoadGraphLibs() sets global gGuiFactory -> TQRootGuiFactory • TRootGuiFactory • uses services from ABC TGuiFactory • enables usage of native Qt components + ROOT widgets • overriding: Denis Bertini

  7. Integrating ROOT events • QRootApplication • Qt event loop • uses QApplication::exec() • ROOT inner loop • connect itself to TUnixSystem::DispatchOneEvent()via a Qtimer class. • ROOT inner loop is the called repeatedly and return quickly • ROOT system event ( TThreads, TTimers, Network classes) are enabled while Qt event loop is activated • ROOT Gui TGxx classes can also be used together with Qt Widget ! Denis Bertini

  8. QtROOT Main program Int main(int argc, char** argv){ QRootApplication a (argc, argv ); TROOT root( “QtRoot”,”test”); TQApplication app(“QtRoot”,&argc,argv); // Native ROOT GUI classes TBrowser b; // Qt windows ApplicationWindow mw; mw.setCaption(“QtRoot”); mw.show(); int res = a.exec(); return res; } Denis Bertini

  9. Ongoing work • Further tests of QtROOT on Unix Platform • GO4 Qt GUI front end in development • HADES Qt based online monitoring • Port to Qt3.0 ( when release available) • Investigate integration of OpenGL Denis Bertini

  10. Conclusions • Full embbeded ROOT Canvas functionnality is available and tested • ROOT system events integration has been tested within the multithreaded GO4 framework which uses TTimers, TThreads and ROOT network classes all together • Running Qt widgets in parallel with ROOT widgets (e.g TBrowser) is possible (see Mohammad Al-Turany talk) Denis Bertini

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