ChargeExchangeMC/src/CexmcHistoWidget.cc

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0025 //
0026 /*
0027  * =============================================================================
0028  *
0029  *       Filename:  CexmcHistoWidget.cc
0030  *
0031  *    Description:  histogram widget without context menu
0032  *                  (derived from TQtWidget)
0033  *
0034  *        Version:  1.0
0035  *        Created:  15.03.2010 19:01:52
0036  *       Revision:  none
0037  *       Compiler:  gcc
0038  *
0039  *         Author:  Alexey Radkov (),
0040  *        Company:  PNPI
0041  *
0042  * =============================================================================
0043  */
0044
0045 #ifdef CEXMC_USE_ROOTQT
0046
0047 #include <QContextMenuEvent>
0048 #include <TObject.h>
0049 #include <TH1.h>
0050 #include <TAxis.h>
0051 #include <TList.h>
0052 #include "CexmcHistoWidget.hh"
0053
0054
0055 CexmcHistoWidget::CexmcHistoWidget()
0056 {
0057     /* this is a workaround of the repaint bug in the ROOT Qt backend:
0058      * see http://root.cern.ch/phpBB3/viewtopic.php?f=3&t=17081#p73055 */
0059     fCanvas->SetFillColor( 10 );
0060 }
0061
0062
0063 void  CexmcHistoWidget::contextMenuEvent( QContextMenuEvent *  aEvent )
0064 {
0065     /* TRootContextMenu responsiveness is very ugly and unstable in Geant4
0066      * environment, so we have to replace it with something more useful
0067      * (e.g. unzooming histogram axes).
0068      * We can switcn back to context menu as soon as ROOT will implement Qt
0069      * backend for its context menu.
0070      * TQtWidget utilizes QContextMenuEvent::Other reason to draw
0071      * TRootContextMenu object. */
0072     if ( aEvent->reason() == QContextMenuEvent::Other )
0073     {
0074         TObject *  object( NULL );
0075         TListIter  curPrimitive( fCanvas->GetListOfPrimitives() );
0076         while ( ( object = curPrimitive.Next() ) )
0077         {
0078             if ( ! object->InheritsFrom( TH1::Class() ) )
0079                 continue;
0080             TH1 *    histo( static_cast< TH1 * >( object ) );
0081             TAxis *  axis( histo->GetXaxis() );
0082             if ( axis )
0083                 axis->UnZoom();
0084             axis = histo->GetYaxis();
0085             if ( axis )
0086                 axis->UnZoom();
0087             axis = histo->GetZaxis();
0088             if ( axis )
0089                 axis->UnZoom();
0090         }
0091         fCanvas->Update();
0092     }
0093 }
0094
0095 #endif
0096