finalcut/src/include/final/ftextview.h

/***********************************************************************
* ftextview.h - Widget FTextView (a multiline text viewer)             *
*                                                                      *
* This file is part of the Final Cut widget toolkit                    *
*                                                                      *
* Copyright 2014-2018 Markus Gans                                      *
*                                                                      *
* The Final Cut is free software; you can redistribute it and/or       *
* modify it under the terms of the GNU Lesser General Public License   *
* as published by the Free Software Foundation; either version 3 of    *
* the License, or (at your option) any later version.                  *
*                                                                      *
* The Final Cut is distributed in the hope that it will be useful,     *
* but WITHOUT ANY WARRANTY; without even the implied warranty of       *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
* GNU Lesser General Public License for more details.                  *
*                                                                      *
* You should have received a copy of the GNU Lesser General Public     *
* License along with this program.  If not, see                        *
* <http://www.gnu.org/licenses/>.                                      *
***********************************************************************/

/*  Inheritance diagram
 *  ═══════════════════
 *
 * ▕▔▔▔▔▔▔▔▔▔▏
 * ▕  FTerm  ▏
 * ▕▁▁▁▁▁▁▁▁▁▏
 *      ▲
 *      │
 * ▕▔▔▔▔▔▔▔▔▔▏ ▕▔▔▔▔▔▔▔▔▔▏
 * ▕ FVTerm  ▏ ▕ FObject ▏
 * ▕▁▁▁▁▁▁▁▁▁▏ ▕▁▁▁▁▁▁▁▁▁▏
 *      ▲           ▲
 *      │           │
 *      └─────┬─────┘
 *            │
 *       ▕▔▔▔▔▔▔▔▔▔▏
 *       ▕ FWidget ▏
 *       ▕▁▁▁▁▁▁▁▁▁▏
 *            ▲
 *            │
 *      ▕▔▔▔▔▔▔▔▔▔▔▔▏
 *      ▕ FTextView ▏
 *      ▕▁▁▁▁▁▁▁▁▁▁▁▏
 */

#ifndef FTEXTVIEW_H
#define FTEXTVIEW_H

#if !defined (USE_FINAL_H) && !defined (COMPILE_FINAL_CUT)
  #error "Only <final/final.h> can be included directly."
#endif

#include <memory>
#include <vector>

#include "final/fapplication.h"
#include "final/fscrollbar.h"
#include "final/fstatusbar.h"
#include "final/fstring.h"
#include "final/fwidget.h"

namespace finalcut
{

//----------------------------------------------------------------------
// class FTextView
//----------------------------------------------------------------------

#pragma pack(push)
#pragma pack(1)

class FTextView : public FWidget
{
  public:
    // Using-declarations
    using FWidget::setGeometry;

    // Constructor
    explicit FTextView (FWidget* = nullptr);

    // Disable copy constructor
    FTextView (const FTextView&) = delete;

    // Destructor
    virtual ~FTextView();

    // Disable assignment operator (=)
    FTextView& operator = (const FTextView&) = delete;

    // Accessors
    const char*        getClassName() const;
    std::size_t        getColumns() const;
    std::size_t        getRows() const;
    const FString      getText() const;
    const FStringList& getLines() const;

    // Mutators
    virtual void       setGeometry ( int, int
                                   , std::size_t, std::size_t
                                   , bool = true );
    void               setText (const FString&);
    void               scrollToX (int);
    void               scrollToY (int);
    void               scrollTo (const FPoint&);
    void               scrollTo (int, int);
    void               scrollBy (int, int);

    // Methods
    virtual void       hide();
    void               append (const FString&);
    void               insert (const FString&, int);
    void               replaceRange (const FString&, int, int);
    void               deleteRange (int, int);
    void               deleteLine (int);
    void               clear();

    // Event handlers
    virtual void       onKeyPress (FKeyEvent*);
    virtual void       onMouseDown (FMouseEvent*);
    virtual void       onMouseUp (FMouseEvent*);
    virtual void       onMouseMove (FMouseEvent*);
    virtual void       onWheel (FWheelEvent*);
    virtual void       onFocusIn (FFocusEvent*);
    virtual void       onFocusOut (FFocusEvent*);

  protected:
    // Method
    virtual void       adjustSize();

  private:
    // Typedef
    typedef std::shared_ptr<FScrollbar> FScrollbarPtr;

    // Accessors
    std::size_t        getTextHeight();
    std::size_t        getTextWidth();

    // Methods
    void               init();
    virtual void       draw();
    void               drawText();
    void               processChanged();
    void               drawHBar();
    void               drawVBar();

    // Callback methods
    void               cb_VBarChange (FWidget*, FDataPtr);
    void               cb_HBarChange (FWidget*, FDataPtr);

    // Data Members
    FStringList        data{};
    FScrollbarPtr      vbar{nullptr};
    FScrollbarPtr      hbar{nullptr};
    bool               update_scrollbar{true};
    int                xoffset{0};
    int                yoffset{0};
    int                nf_offset{0};
    std::size_t        maxLineWidth{0};
};
#pragma pack(pop)


// FListBox inline functions
//----------------------------------------------------------------------
inline const char* FTextView::getClassName() const
{ return "FTextView"; }

//----------------------------------------------------------------------
inline std::size_t FTextView::getColumns() const
{ return maxLineWidth; }

//----------------------------------------------------------------------
inline std::size_t FTextView::getRows() const
{ return std::size_t(data.size()); }

//----------------------------------------------------------------------
inline const FStringList& FTextView::getLines() const
{ return data; }

//----------------------------------------------------------------------
inline void FTextView::scrollTo (const FPoint& pos)
{ scrollTo(pos.getX(), pos.getY()); }

//----------------------------------------------------------------------
inline void FTextView::deleteRange (int from, int to)
{ replaceRange (FString(), from, to); }

//----------------------------------------------------------------------
inline void FTextView::deleteLine (int pos)
{ deleteRange (pos, pos); }

}  // namespace finalcut

#endif  // FTEXTVIEW_H