RCanvasWidget.cpp

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// Author: Sergey Linev, GSI  13/01/2021
 
/*************************************************************************
 * Copyright (C) 1995-2021, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#include "RCanvasWidget.h"
 
#include <ROOT/RCanvas.hxx>
#include <ROOT/RWebDisplayArgs.hxx>
 
RCanvasWidget::RCanvasWidget(QWidget *parent) : QWidget(parent)
{
 
   setObjectName( "RCanvasWidget");
 
   setSizeIncrement( QSize( 100, 100 ) );
 
   setUpdatesEnabled( true );
   setMouseTracking(true);
 
   setFocusPolicy( Qt::TabFocus );
   setCursor( Qt::CrossCursor );
 
   setAcceptDrops(true);
 
   fCanvas = ROOT::Experimental::RCanvas::Create("ExampleCanvas");
 
   auto where = ROOT::Experimental::RWebDisplayArgs::GetQt5EmbedQualifier(this, "noopenui");
 
   fCanvas->Show(where);
 
   fView = findChild<QWebEngineView*>("RootWebView");
   if (!fView) {
      printf("FAIL TO FIND QWebEngineView - ROOT Qt5Web plugin does not work properly !!!!!\n");
      exit(11);
   }
 
   fView->resize(width(), height());
   fCanvas->SetSize({ (ROOT::Experimental::RPadLength::Pixel) width(), (ROOT::Experimental::RPadLength::Pixel) height() });
}
 
RCanvasWidget::~RCanvasWidget()
{
   // remove canvas from global lists
   fCanvas->Remove();
}
 
void RCanvasWidget::resizeEvent(QResizeEvent *event)
{
   fView->resize(width(), height());
   fCanvas->SetSize({ (ROOT::Experimental::RPadLength::Pixel) width(), (ROOT::Experimental::RPadLength::Pixel) height() });
}