TCanvasWidget.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 "TCanvasWidget.h"
 
#include "TCanvas.h"
#include "TROOT.h"
#include "TClass.h"
#include "TEnv.h"
 
#include "TWebCanvas.h"
 
TCanvasWidget::TCanvasWidget(QWidget *parent) : QWidget(parent)
{
   setObjectName("TCanvasWidget");
 
   setSizeIncrement(QSize(100, 100));
 
   setUpdatesEnabled(true);
   setMouseTracking(true);
 
   setFocusPolicy(Qt::TabFocus);
   setCursor(Qt::CrossCursor);
 
   setAcceptDrops(true);
 
   static int wincnt = 1;
 
   auto name = TString::Format("Canvas%d", wincnt++);
 
   fCanvas = TWebCanvas::CreateWebCanvas(name, name);
 
   auto web = static_cast<TWebCanvas *> (fCanvas->GetCanvasImp());
 
   web->SetCanCreateObjects(kFALSE); // not yet create objects on server side
 
   web->SetUpdatedHandler([this]() { emit CanvasUpdated(); });
 
   web->SetActivePadChangedHandler([this](TPad *pad) { emit SelectedPadChanged(pad); });
 
   web->SetPadClickedHandler([this](TPad *pad, int x, int y) { emit PadClicked(pad, x, y); });
 
   web->SetPadDblClickedHandler([this](TPad *pad, int x, int y) { emit PadDblClicked(pad, x, y); });
 
   auto where = ROOT::RWebDisplayArgs::GetQt5EmbedQualifier(this, "noopenui", QT_VERSION);
 
   web->ShowWebWindow(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->SetCanvasSize(width(), height());
}
 
TCanvasWidget::~TCanvasWidget()
{
   if (fCanvas) {
      gROOT->GetListOfCanvases()->Remove(fCanvas);
 
      fCanvas->SetCanvasImp(nullptr);
 
      fCanvas->Close();
      delete fCanvas;
      fCanvas = nullptr;
   }
}
 
void TCanvasWidget::resizeEvent(QResizeEvent *event)
{
   fView->resize(width(), height());
   fCanvas->SetCanvasSize(width(), height());
}
 
void TCanvasWidget::activateEditor(TPad *pad, TObject *obj)
{
   TWebCanvas *cimp = dynamic_cast<TWebCanvas *>(fCanvas->GetCanvasImp());
   if (cimp) {
      cimp->ShowEditor(kTRUE);
      cimp->ActivateInEditor(pad, obj);
   }
}
 
void TCanvasWidget::setEditorVisible(bool flag)
{
   TCanvasImp *cimp = fCanvas->GetCanvasImp();
   if (cimp)
      cimp->ShowEditor(flag);
}
 
void TCanvasWidget::activateStatusLine()
{
   TCanvasImp *cimp = fCanvas->GetCanvasImp();
   if (cimp)
      cimp->ShowStatusBar(kTRUE);
}