/***********************************************************************
* fscrollview.h - Widget FScrollView (a scrolling area with on-demand  *
*                 scroll bars)                                         *
*                                                                      *
* This file is part of the Final Cut widget toolkit                    *
*                                                                      *
* Copyright 2017-2018 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 ▏
 *       ▕▁▁▁▁▁▁▁▁▁▏
 *            ▲
 *            │
 *     ▕▔▔▔▔▔▔▔▔▔▔▔▔▔▏
 *     ▕ FScrollView ▏
 *     ▕▁▁▁▁▁▁▁▁▁▁▁▁▁▏
 */

#ifndef FSCROLLVIEW_H
#define FSCROLLVIEW_H

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

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

namespace finalcut
{

//----------------------------------------------------------------------
// class FScrollView
//----------------------------------------------------------------------

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

class FScrollView : public FWidget
{
  public:
    // Using-declaration
    using FWidget::setGeometry;
    using FWidget::setPrintPos;
    using FWidget::setPos;

    // Constructor
    explicit FScrollView (FWidget* = 0);

    // Destructor
    virtual ~FScrollView();

    // Accessors
    const char*       getClassName() const;
    int               getViewportWidth() const;
    int               getViewportHeight() const;
    int               getScrollWidth() const;
    int               getScrollHeight() const;
    const FPoint      getScrollPos() const;
    int               getScrollX() const;
    int               getScrollY() const;

    // Mutator
    virtual void      setScrollWidth (int);
    virtual void      setScrollHeight (int);
    virtual void      setScrollSize (int, int);
    virtual void      setX (int, bool = true);
    virtual void      setY (int, bool = true);
    virtual void      setPos (int, int, bool = true);
    virtual void      setWidth (int, bool = true);
    virtual void      setHeight (int, bool = true);
    virtual void      setSize (int, int, bool = true);
    void              setGeometry (int, int, int, int, bool = true);
    void              setCursorPos (int, int);
    void              setPrintPos (int, int);
    bool              setViewportPrint (bool);
    bool              setViewportPrint();
    bool              unsetViewportPrint();
    bool              setBorder (bool);
    bool              setBorder();
    bool              unsetBorder();
    void              setHorizontalScrollBarMode (fc::scrollBarMode);
    void              setVerticalScrollBarMode (fc::scrollBarMode);

    // Inquiries
    bool              hasBorder();
    bool              isViewportPrint();

    // Method
    virtual void      clearArea (int = ' ');
    void              scrollToX (int);
    void              scrollToY (int);
    void              scrollTo (const FPoint&);
    void              scrollTo (int, int);
    void              scrollBy (int, int);
    virtual void      draw();

    // Event handlers
    void              onKeyPress (FKeyEvent*);
    void              onWheel (FWheelEvent*);
    void              onFocusIn (FFocusEvent*);
    void              onChildFocusIn (FFocusEvent*);
    void              onChildFocusOut (FFocusEvent*);

  protected:
    // Using-declaration
    using FVTerm::clearArea;

    // Accessor
    term_area*        getPrintArea();

    // Method
    void              adjustSize();
    void              copy2area();

  private:
    // Constants
    static const int vertical_border_spacing = 2;
    static const int horizontal_border_spacing = 2;

    // Disable copy constructor
    FScrollView (const FScrollView&);

    // Disable assignment operator (=)
    FScrollView& operator = (const FScrollView&);

    // Accessors
    FPoint            getViewportCursorPos();

    // Methods
    void              init (FWidget*);
    void              init_scrollbar();
    void              calculateScrollbarPos();
    void              setHorizontalScrollBarVisibility();
    void              setVerticalScrollBarVisibility();
    void              setViewportCursor();
    void              redrawHBar();
    void              redrawVBar();
    void              drawHBar();
    void              drawVBar();

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

    // Data Members
    FRect             scroll_geometry;
    FRect             viewport_geometry;
    term_area*        viewport;  // virtual scroll content
    FScrollbar*       vbar;
    FScrollbar*       hbar;
    int               nf_offset;
    bool              border;
    bool              use_own_print_area;
    bool              update_scrollbar;
    fc::scrollBarMode vMode;  // fc:Auto, fc::Hidden or fc::Scroll
    fc::scrollBarMode hMode;
};
#pragma pack(pop)


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

//----------------------------------------------------------------------
inline int FScrollView::getViewportWidth() const
{ return getWidth() - vertical_border_spacing - nf_offset; }

//----------------------------------------------------------------------
inline int FScrollView::getViewportHeight() const
{ return getHeight() - horizontal_border_spacing; }

//----------------------------------------------------------------------
inline int FScrollView::getScrollWidth() const
{ return scroll_geometry.getWidth(); }

//----------------------------------------------------------------------
inline int FScrollView::getScrollHeight() const
{ return scroll_geometry.getHeight(); }

//----------------------------------------------------------------------
inline const FPoint FScrollView::getScrollPos() const
{ return viewport_geometry.getPos(); }

//----------------------------------------------------------------------
inline int FScrollView::getScrollX() const
{ return viewport_geometry.getX(); }

//----------------------------------------------------------------------
inline int FScrollView::getScrollY() const
{ return viewport_geometry.getY(); }

//----------------------------------------------------------------------
inline bool FScrollView::setViewportPrint()
{ return setViewportPrint(true); }

//----------------------------------------------------------------------
inline bool FScrollView::unsetViewportPrint()
{ return setViewportPrint(false); }

//----------------------------------------------------------------------
inline bool FScrollView::setBorder()
{ return setBorder(true); }

//----------------------------------------------------------------------
inline bool FScrollView::unsetBorder()
{ return setBorder(false); }

//----------------------------------------------------------------------
inline bool FScrollView::hasBorder()
{ return border; }

//----------------------------------------------------------------------
inline bool FScrollView::isViewportPrint()
{ return ! use_own_print_area; }

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

}  // namespace finalcut

#endif  // FSCROLLVIEW_H