// $Id$
//-----------------------------------------------------------------------
//       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 TGO4LABELPAINTER_H
#define TGO4LABELPAINTER_H

#include "TPaveText.h"
#include "TLine.h"

/**
 * Text label that knows its author. Required to suppress
 * orphaned copies of marker and condition labels after canvas
 * reconstruction by streamer.
 * @since 8/2004
 * @author J. Adamczewski
 */
class TGo4Label : public TPaveText {

public:
   TGo4Label() : TPaveText(), fxOwner(nullptr) { SetBit(kMustCleanup); /*SetBit(kCanDelete,kFALSE);*/ }

   TGo4Label(Double_t x1, Double_t y1, Double_t x2, Double_t y2, Option_t *option = "br")
      : TPaveText(x1, y1, x2, y2, option), fxOwner(nullptr)
   {
      SetBit(kMustCleanup); /*SetBit(kCanDelete,kFALSE);*/
   }

   virtual ~TGo4Label() { fxLastDeleted = this; }

   void SetOwner(TObject *ob) { fxOwner = ob; }

   void Paint(Option_t *opt = "") override;

   void ExecuteEvent(Int_t event, Int_t px, Int_t py) override;

   /** set this to pointer of last deleted instance before*/
   static const void *fxLastDeleted;

private:
   /** the owner of this label */
   TObject *fxOwner{nullptr}; //!

   ClassDefOverride(TGo4Label, 7)
};

/**
 * Connection line for labels that knows its author. Required to suppress
 * orphaned copies of marker and condition label connectors after canvas
 * reconstruction by streamer.
 * @since 8/2004
 * @author J. Adamczewski
 */
class TGo4LabelConnector : public TLine {

public:
   TGo4LabelConnector() : TLine(), fxOwner(nullptr) { SetBit(kMustCleanup); }

   TGo4LabelConnector(Double_t x1, Double_t y1, Double_t x2, Double_t y2) : TLine(x1, y1, x2, y2), fxOwner(nullptr)
   {
      SetBit(kMustCleanup);
   }

   virtual ~TGo4LabelConnector() { fxLastDeleted = this; };

   void SetOwner(TObject *ob) { fxOwner = ob; }

   void Paint(Option_t *opt = "") override;

   /** set this to pointer of last deleted instance before*/
   static const void *fxLastDeleted;

private:
   /** the owner of this connector line */
   TObject *fxOwner{nullptr}; //!

   ClassDefOverride(TGo4LabelConnector, 6)
};

/**
* Base class for painters providing a textlabel for
* additional information. To be inherited by
* condition painters and marker painters.
* @since 6/2004
* @author J. Adamczewski
*/

class TGo4LabelPainter : public TNamed, public TAttLine, public TAttFill, public TAttText {
  public:
    TGo4LabelPainter();
    TGo4LabelPainter(const char *name, const char *title = nullptr);
    virtual ~TGo4LabelPainter();

    /** Draw the label */
    virtual void PaintLabel(Option_t *opt = "");

    /** Erase the label */
    virtual void UnPaintLabel(Option_t *opt = "");

    /** refresh painting of label with current attributes */
    virtual void RePaintLabel(Option_t *opt = "");

    /** pop all components to the front of the pad*/
    virtual void DisplayToFront(Option_t *opt = "");

    void SetCaption(const char *txt) { fxCaption=txt; }
    void SetX0(Double_t x = 0.) { fdX0 = x; }
    void SetY0(Double_t y = 0.) { fdY0 = y; }
    void SetWidth(Double_t w = 0.) { fdWidth = w; }
    void SetHeight(Double_t h = 0.) { fdHeight = h; }

    void AddToLabel(const char *txt) { if(fxLabel) fxLabel->AddText(txt); }

    /** Initialize the label attributes */
    void InitAttributes();

    /** Reference coordinate x of label box (lower left corner) */
    Double_t GetLabelXlo();

    /** Reference coordinate y of label box (lower left corner) */
    Double_t GetLabelYlo();

    /** Reference coordinate x of label box (upper right corner) */
    Double_t GetLabelXup();

    /** Reference coordinate y of label box (upper right corner) */
    Double_t GetLabelYup();

   private:
     /** the label */
     TGo4Label* fxLabel{nullptr};

    /** initial reference coordinates x */
    Double_t fdX0{0};

    /** initial reference coordinates y */
    Double_t fdY0{0};

    /** initial width relative to whole pad*/
    Double_t fdWidth{0};

    /** initial height relative to whole pad */
    Double_t fdHeight{0};

    /** Headline for the label */
    TString fxCaption;

    /** Flag to handle streamed label from file correctly*/
    Bool_t fbIsLabStreamed{kFALSE}; //!

    /** Create Label at the window coords. */
    TGo4Label* CreateCurrentLabel(Double_t x, Double_t y);

    /** Evaluate coordinates for new label for given xmin, ymin  with respect to pad size*/
    void LabelCoords(Double_t &xmin, Double_t &ymin, Double_t &xmax, Double_t &ymax);

    /** Check if label is still existing. Uses root list of cleanups. */
    Bool_t CheckLabel();

  ClassDefOverride(TGo4LabelPainter,6)
};

#endif //TGO4LABELPAINTER_H