/***********************************************************************
* flistbox.h - Widget FListBox and FListBoxItem                        *
*                                                                      *
* 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 ▏
 *       ▕▁▁▁▁▁▁▁▁▁▏
 *            ▲
 *            │
 *       ▕▔▔▔▔▔▔▔▔▔▔▏1     *▕▔▔▔▔▔▔▔▔▔▔▔▔▔▔▏
 *       ▕ FListBox ▏- - - -▕ FListBoxItem ▏
 *       ▕▁▁▁▁▁▁▁▁▁▁▏       ▕▁▁▁▁▁▁▁▁▁▁▁▁▁▁▏
 *
 */

#ifndef FLISTBOX_H
#define FLISTBOX_H

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

#include <vector>

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

namespace finalcut
{

//----------------------------------------------------------------------
// class FListBoxItem
//----------------------------------------------------------------------

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

class FListBoxItem
{
  public:
    // Constructors
    FListBoxItem ();
    FListBoxItem (const FListBoxItem&);  // copy constructor
    explicit FListBoxItem (const FString&, FWidget::data_ptr = 0);

    // Destructor
    virtual ~FListBoxItem();

    // Assignment operator (=)
    FListBoxItem& operator = (const FListBoxItem&);

    // Accessors
    virtual FString& getText();
    virtual FWidget::data_ptr getData() const;

    // Mutators
    void setText (const FString&);
    void setData (FWidget::data_ptr);

    // Methods
    void clear();

  private:
    // Friend classes
    friend class FListBox;

    // Data Members
    FString           text{};
    FWidget::data_ptr data_pointer{0};
    fc::brackets_type brackets{fc::NoBrackets};
    bool              selected{false};
};
#pragma pack(pop)


// FListBoxItem inline functions
//----------------------------------------------------------------------
inline FString& FListBoxItem::getText()
{ return text; }

//----------------------------------------------------------------------
inline FWidget::data_ptr FListBoxItem::getData() const
{ return data_pointer; }

//----------------------------------------------------------------------
inline void FListBoxItem::setText (const FString& txt)
{ text = txt; }

//----------------------------------------------------------------------
inline void FListBoxItem::setData (FWidget::data_ptr data)
{ data_pointer = data; }

//----------------------------------------------------------------------
inline void FListBoxItem::clear()
{ text.clear(); }


//----------------------------------------------------------------------
// class FListBox
//----------------------------------------------------------------------

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

class FListBox : public FWidget
{
  public:
    // Typedef
    typedef std::vector<FListBoxItem> listBoxItems;

    // Using-declaration
    using FWidget::setGeometry;

    // Constructor
    explicit FListBox (FWidget* = 0);
    template <typename Iterator, typename InsertConverter>
    FListBox (Iterator, Iterator, InsertConverter, FWidget* = 0);
    template <typename Container, typename LazyConverter>
    FListBox (Container, LazyConverter, FWidget* = 0);
    // Disable copy constructor
    FListBox (const FListBox&) = delete;
    // Destructor
    virtual  ~FListBox();

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

    // Accessors
    const char*  getClassName() const;
    std::size_t  getCount() const;
    FListBoxItem getItem (std::size_t);
    FListBoxItem getItem (listBoxItems::iterator) const;
    std::size_t  currentItem() const;
    FString&     getText();

    // Mutators
    void         setCurrentItem (std::size_t);
    void         setCurrentItem (listBoxItems::iterator);
    void         selectItem (std::size_t);
    void         selectItem (listBoxItems::iterator);
    void         unselectItem (std::size_t);
    void         unselectItem (listBoxItems::iterator);
    void         showInsideBrackets (std::size_t, fc::brackets_type);
    void         showNoBrackets (std::size_t);
    void         showNoBrackets (listBoxItems::iterator);
    virtual void setGeometry (int, int, std::size_t, std::size_t, bool = true);
    void         setMultiSelection (bool);
    void         setMultiSelection ();
    void         unsetMultiSelection ();
    virtual bool setDisable();
    virtual bool setFocus (bool);
    virtual bool setFocus();
    virtual bool unsetFocus();
    void         setText (const FString&);

    // Inquiries
    bool         isSelected (std::size_t);
    bool         isSelected (listBoxItems::iterator) const;
    bool         isMultiSelection() const;
    bool         hasBrackets (std::size_t);
    bool         hasBrackets (listBoxItems::iterator) const;

    // Methods
    virtual void hide();
    template <typename Iterator, typename InsertConverter>
    void         insert (Iterator, Iterator, InsertConverter);
    template <typename Container, typename LazyConverter>
    void         insert (Container, LazyConverter);
    void         insert (FListBoxItem);
    void         insert ( const FString&
                        , fc::brackets_type = fc::NoBrackets
                        , bool = false
                        , data_ptr = 0 );
    void         insert ( long
                        , fc::brackets_type = fc::NoBrackets
                        , bool = false
                        , data_ptr = 0 );
    void         remove (std::size_t);
    void         clear();

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

  protected:
    // Methods
    void         adjustYOffset (std::size_t);
    virtual void adjustSize();

  private:
    // Enumeration
    enum convert_type
    {
      no_convert     = 0,
      direct_convert = 1,
      lazy_convert   = 2
    };

    // Accessors
    static FString& getString (listBoxItems::iterator);

    // Methods
    void         init();
    virtual void draw();
    void         drawHeadline();
    void         drawList();
    void         drawListLine (int, listBoxItems::iterator, bool);
    void         printLeftBracket (fc::brackets_type);
    void         printRightBracket (fc::brackets_type);
    void         drawListBracketsLine (int, listBoxItems::iterator, bool);
    void         setLineAttributes (int, bool, bool, bool&);
    void         unsetAttributes();
    void         updateDrawing (bool, bool);
    void         recalculateHorizontalBar (std::size_t, bool);
    void         recalculateVerticalBar (std::size_t);
    void         getWidgetFocus();
    void         multiSelection (std::size_t);
    void         multiSelectionUpTo (std::size_t);
    void         wheelUp (int);
    void         wheelDown (int);
    bool         dragScrollUp();
    bool         dragScrollDown();
    void         dragUp (int);
    void         dragDown (int);
    void         stopDragScroll();
    void         prevListItem (int);
    void         nextListItem (int);
    void         scrollToX (int);
    void         scrollToY (int);
    void         scrollLeft (int);
    void         scrollRight (int);
    void         keyUp();
    void         keyDown();
    void         keyLeft();
    void         keyRight();
    void         keyPgUp();
    void         keyPgDn();
    void         keyHome();
    void         keyEnd();
    bool         keyEsc();
    void         keyEnter();
    bool         keySpace();
    bool         keyInsert();
    bool         keyBackspace();
    bool         keyIncSearchInput (FKey);
    void         processClick();
    void         processSelect();
    void         processChanged();
    void         lazyConvert (listBoxItems::iterator, int);
    listBoxItems::iterator index2iterator (std::size_t);

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

    // Function Pointer
    void         (*convertToItem) ( FListBoxItem&
                                  , FWidget::data_ptr
                                  , int index ){0};

    // Data Members
    listBoxItems      itemlist{};
    FWidget::data_ptr source_container{0};
    convert_type      conv_type{FListBox::no_convert};
    FScrollbar*       vbar{0};
    FScrollbar*       hbar{0};
    FString           text{};
    FString           inc_search{};
    bool              multi_select{false};
    bool              mouse_select{false};
    fc::dragScroll    drag_scroll{fc::noScroll};
    bool              scroll_timer{false};
    int               scroll_repeat{100};
    int               scroll_distance{1};
    std::size_t       current{0};
    int               last_current{-1};
    int               secect_from_item{-1};
    int               xoffset{0};
    int               yoffset{0};
    int               last_yoffset{-1};
    std::size_t       nf_offset{0};
    std::size_t       max_line_width{0};
};
#pragma pack(pop)


// FListBox inline functions
//----------------------------------------------------------------------
template <typename Iterator, typename InsertConverter>
inline FListBox::FListBox ( Iterator first
                          , Iterator last
                          , InsertConverter convert
                          , FWidget* parent )
  : FWidget(parent)
{
  init();

  while ( first != last )
  {
    insert(convert(first), fc::NoBrackets, false, &(*first));
    ++first;
  }
}

//----------------------------------------------------------------------
template <typename Container, typename LazyConverter>
inline FListBox::FListBox ( Container container
                          , LazyConverter convert
                          , FWidget* parent )
  : FWidget(parent)
{
  init();
  insert (container, convert);
}

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

//----------------------------------------------------------------------
inline std::size_t FListBox::getCount() const
{ return itemlist.size(); }

//----------------------------------------------------------------------
inline FListBoxItem FListBox::getItem (std::size_t index)
{
  listBoxItems::iterator iter = index2iterator(index - 1);
  return *iter;
}

//----------------------------------------------------------------------
inline FListBoxItem FListBox::getItem (listBoxItems::iterator iter) const
{ return *iter; }

//----------------------------------------------------------------------
inline std::size_t FListBox::currentItem() const
{ return current; }

//----------------------------------------------------------------------
inline FString& FListBox::getText()
{ return text; }

//----------------------------------------------------------------------
inline void FListBox::selectItem (std::size_t index)
{ index2iterator(index - 1)->selected = true; }

//----------------------------------------------------------------------
inline void FListBox::selectItem (listBoxItems::iterator iter)
{ iter->selected = true; }

//----------------------------------------------------------------------
inline void FListBox::unselectItem (std::size_t index)
{ index2iterator(index - 1)->selected = false; }

//----------------------------------------------------------------------
inline void FListBox::unselectItem (listBoxItems::iterator iter)
{ iter->selected = false; }

//----------------------------------------------------------------------
inline void FListBox::showNoBrackets (std::size_t index)
{ index2iterator(index - 1)->brackets = fc::NoBrackets; }

//----------------------------------------------------------------------
inline void FListBox::showNoBrackets (listBoxItems::iterator iter)
{ iter->brackets = fc::NoBrackets; }

//----------------------------------------------------------------------
inline void FListBox::setMultiSelection (bool on)
{ multi_select = on; }

//----------------------------------------------------------------------
inline void FListBox::setMultiSelection()
{ setMultiSelection(true); }

//----------------------------------------------------------------------
inline void FListBox::unsetMultiSelection()
{ setMultiSelection(false); }

//----------------------------------------------------------------------
inline bool FListBox::setDisable()
{ return setEnable(false); }

//----------------------------------------------------------------------
inline bool FListBox::setFocus()
{ return setFocus(true); }

//----------------------------------------------------------------------
inline bool FListBox::unsetFocus()
{ return setFocus(false); }

//----------------------------------------------------------------------
inline bool FListBox::isSelected (std::size_t index)
{ return index2iterator(index - 1)->selected; }

//----------------------------------------------------------------------
inline bool FListBox::isSelected (listBoxItems::iterator iter) const
{ return iter->selected; }

//----------------------------------------------------------------------
inline bool FListBox::isMultiSelection() const
{ return multi_select; }

//----------------------------------------------------------------------
inline bool FListBox::hasBrackets(std::size_t index)
{ return bool(index2iterator(index - 1)->brackets > 0); }

//----------------------------------------------------------------------
inline bool FListBox::hasBrackets(listBoxItems::iterator iter) const
{ return bool(iter->brackets > 0); }

//----------------------------------------------------------------------
template <typename Iterator, typename InsertConverter>
inline void FListBox::insert ( Iterator first
                             , Iterator last
                             , InsertConverter convert )
{
  conv_type = direct_convert;

  while ( first != last )
  {
    insert (convert(first), fc::NoBrackets, false, &(*first));
    ++first;
  }
}

//----------------------------------------------------------------------
template <typename Container, typename LazyConverter>
void FListBox::insert (Container container, LazyConverter convert)
{
  conv_type = lazy_convert;
  source_container = container;
  convertToItem = convert;
  std::size_t size = container->size();

  if ( size > 0 )
    itemlist.resize(size);

  recalculateVerticalBar(size);
}

//----------------------------------------------------------------------
inline FListBox::listBoxItems::iterator \
    FListBox::index2iterator (std::size_t index)
{
  listBoxItems::iterator iter = itemlist.begin();
  std::advance (iter, index);
  return iter;
}

}  // namespace finalcut

#endif  // FLISTBOX_H