QWebCanvas.h

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// $Id$
//-----------------------------------------------------------------------
//       The GSI Online Offline Object Oriented (Go4) Project
//         Experiment Data Processing at EE department, GSI
//-----------------------------------------------------------------------
// Copyright (C) 2000- GSI Helmholtzzentrum fuer Schwerionenforschung GmbH
//                     Planckstr. 1, 64291 Darmstadt, Germany
// Contact:            http://go4.gsi.de
//-----------------------------------------------------------------------
// This software can be used under the license agreements as stated
// in Go4License.txt file which is part of the distribution.
//-----------------------------------------------------------------------
 
#ifndef QWEBCANVAS_H
#define QWEBCANVAS_H
 
#include <QWidget>
#include <QWebEngineView>
 
class TCanvas;
class TPad;
class TObject;
class QTimer;
 
class QWebCanvas : public QWidget {
 
   Q_OBJECT
 
public:
   QWebCanvas(QWidget *parent = nullptr);
   virtual ~QWebCanvas();

   TCanvas *getCanvas() { return fCanvas; }
 
   bool isStatusBarVisible();
   bool isEditorVisible();
 
   void Modified();
   void Update();
 
signals:
 
   void CanvasDropEvent(QDropEvent *, TPad *);
 
   void CanvasUpdated();
 
   void SelectedPadChanged(TPad *);
 
   void PadClicked(TPad *, int, int);
 
   void PadDblClicked(TPad *, int, int);
 
public slots:
 
   void activateEditor(TPad *pad = nullptr, TObject *obj = nullptr);
   void activateStatusLine();
 
   void setStatusBarVisible(bool flag = true);
 
   void setEditorVisible(bool flag = true);
 
protected slots:
 
   void dropView(QDropEvent* event);
 
   void processRepaintTimer();
 
protected:
 
   void resizeEvent(QResizeEvent *event) override;
 
   void dropEvent(QDropEvent *event) override;
 
   double scaledPosition(int p) { return (double) p * fQtScalingfactor; }
 
   void SetPrivateCanvasFields(bool on_init);
 
   void ProcessCanvasUpdated() { emit CanvasUpdated(); }
 
   void ProcessActivePadChanged(TPad *pad) { emit SelectedPadChanged(pad); }
 
   void ProcessPadClicked(TPad *pad, int x, int y) { emit PadClicked(pad,x,y); }
 
   void ProcessPadDblClicked(TPad *pad, int x, int y) { emit PadDblClicked(pad,x,y); }
 
   QWebEngineView *fView{nullptr};  
 
   TCanvas *fCanvas{nullptr};
 
   QTimer *fRepaintTimer{nullptr};
 
   double fQtScalingfactor{0};
};
 
#endif