QPaintWidget.h

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// Author: Sergey Linev, GSI  29/06/2026
 
/*************************************************************************
 * Copyright (C) 1995-2026, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT_QPaintWidget
#define ROOT_QPaintWidget
 
#include <QWidget>
 
class TCanvas;
class TPad;
class TMethod;
class QPainter;
 
class QPaintWidget : public QWidget {
 
   Q_OBJECT
 
public:
   QPaintWidget(QWidget *parent = nullptr);
   virtual ~QPaintWidget();
 
   /// returns canvas shown in the widget
   TCanvas *getCanvas() { return fCanvas; }
 
   QPainter *getPainter() const { return fPainter; }
 
   void SetCanvas(TCanvas *canv) { fCanvas = canv; }
 
   void SetShowToolTip(bool on) { fShowToolTip = on; }
 
signals:
   void CanvasStatusEvent(const QString &msg);
 
protected:
   bool event(QEvent *event) override;
 
   void resizeEvent(QResizeEvent *event) override;
 
   void paintEvent(QPaintEvent *event) override;
 
   void mousePressEvent(QMouseEvent *event) override;
   void mouseMoveEvent(QMouseEvent *event) override;
   void mouseReleaseEvent(QMouseEvent *event) override;
   void mouseDoubleClickEvent(QMouseEvent* event) override;
   void wheelEvent(QWheelEvent* event) override;
   void enterEvent(QEnterEvent *event) override;
   void leaveEvent(QEvent *event) override;
 
   double scaledPosition(int p) { return (double) p * fQtScalingfactor; }
 
   QPoint scaledMousePoint(QMouseEvent *event);
 
   TCanvas *fCanvas = nullptr; ///<  canvas shown in the widget
 
   QPainter *fPainter = nullptr; ///< temporary painter created inside paintEvent handler
 
   double fQtScalingfactor = 1.;
 
   bool              fMaskDoubleClick = false;
   bool              fShowEventStatus = true;
   bool              fShowToolTip = false;
};
 
#endif