//
// Fl_Table -- A table widget
//
// Copyright 2002 by Greg Ercolano.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "erco at seriss dot com".
//
// TODO:
//    o Auto scroll during dragged selection
//    o Keyboard navigation (up/down/left/right arrow)
//

#ifndef _FL_TABLE_H
#define _FL_TABLE_H

#include <sys/types.h>
#include <string.h>		// memcpy
#ifdef _WIN32
#include <malloc.h>		// WINDOWS: malloc/realloc
#else /*_WIN32*/
#include <stdlib.h>		// UNIX: malloc/realloc
#endif /*_WIN32*/

#include <FL/Fl.H>
#include <FL/Fl_Group.H>
#include <FL/Fl_Scroll.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Scrollbar.H>

class Fl_Table : public Fl_Group
{
public:
    enum TableContext
    {
	CONTEXT_NONE = 0,
	CONTEXT_STARTPAGE,	// before a page is redrawn
	CONTEXT_ENDPAGE,	// after a page is redrawn
	CONTEXT_ROW_HEADER,	// in the row header
	CONTEXT_COL_HEADER,	// in the col header
	CONTEXT_CELL,		// in one of the cells
	CONTEXT_TABLE,		// in the table
	CONTEXT_RC_RESIZE	// column or row being resized
    };

private:
    int _rows, _cols,	 	// total rows/cols
	_row_header_w,		// width of row header
	_col_header_h,		// height of column header
	_row_position,		// last row_position set (not necessarily == toprow!)
	_col_position;		// last col_position set (not necessarily == leftcol!)

    char _row_header,		// row header enabled?
         _col_header,		// col header enabled?
	 _row_resize,		// row resizing enabled?
	 _col_resize;		// col resizing enabled?
    int
	 _row_resize_min,	// row minimum resizing height (default=1)
	 _col_resize_min;	// col minimum resizing width (default=1)

    // OPTIMIZATION: partial row/column redraw variables
    int _redraw_toprow, _redraw_botrow,
        _redraw_leftcol, _redraw_rightcol;

    Fl_Color _row_header_color,
             _col_header_color;

    // An STL-ish vector without templates
    class IntVector 
    {
        int *arr;
	unsigned int _size;
	void init() 
	    { arr = NULL; _size = 0; }
	void copy(int *newarr, unsigned int newsize) 
	    { size(newsize); memcpy(arr, newarr, newsize * sizeof(int)); }
    public:
        IntVector() { init(); }						// CTOR
	~IntVector() { if ( arr ) free(arr); arr = NULL; }		// DTOR
	IntVector(IntVector&o) { init(); copy(o.arr, o._size); }	// COPY CTOR
	IntVector& operator=(IntVector&o) 				// ASSIGN
	    { init(); copy(o.arr, o._size); return(*this); }
	int operator[](int x) const { return(arr[x]); }
	int& operator[](int x) { return(arr[x]); }
	unsigned int size() { return(_size); }
	void size(unsigned int count)
	{
	    if ( count != _size )
		{ arr = (int*)realloc(arr, count * sizeof(int)); _size = count; }
	}
	int pop_back() { int tmp = arr[_size-1]; _size--; return(tmp); }
	void push_back(int val) { unsigned int x = _size; size(_size+1); arr[x] = val; }
	int back() { return(arr[_size-1]); }
    };

    IntVector
        _colwidths,		// column widths in pixels
        _rowheights;		// row heights in pixels

    Fl_Cursor _last_cursor;	// last mouse cursor before changed to 'resize' cursor

    // EVENT CALLBACK DATA
    TableContext _callback_context;	// event context
    int _callback_row, _callback_col;	// event row/col

    // handle() state variables.
    //    Put here instead of local statics in handle(), so more
    //    than one Fl_Table can exist without crosstalk between them.
    //
    int _resizing_col,			// column being dragged
	_resizing_row,			// row being dragged
	_dragging_x,			// starting x position for horiz drag
	_dragging_y,			// starting y position for vert drag
	_last_row;			// last row we FL_PUSH'ed

    // Redraw single cell
    void _redraw_cell(TableContext context, int R, int C);

protected:
    enum ResizeFlag
    {
        RESIZE_NONE      = 0,
        RESIZE_COL_LEFT  = 1,
        RESIZE_COL_RIGHT = 2,
        RESIZE_ROW_ABOVE = 3,
        RESIZE_ROW_BELOW = 4
    };

    int table_w, table_h;			// table's virtual size (in pixels)
    int toprow, botrow, 			// four corners of viewable table
	leftcol, rightcol;

    // OPTIMIZATION: Precomputed scroll positions for the toprow/leftcol
    int toprow_scrollpos,
        leftcol_scrollpos;

    // Dimensions
    int tix, tiy, tiw, tih,			// data table inner dimension xywh
        tox, toy, tow, toh,			// data table outer dimension xywh
	wix, wiy, wiw, wih;			// widget inner dimension xywh

    Fl_Scroll *table;				// container for child fltk widgets (if any)
    Fl_Scrollbar *vscrollbar, 			// vertical scrollbar
                 *hscrollbar;			// horizontal scrollbar

    // Fltk
    int handle(int e);				// fltk handle() override

    // Class maintenance
    void recalc_dimensions();
    void table_resized();			// table resized; recalc
    void table_scrolled();			// table scrolled; recalc
    void get_bounds(TableContext context,	// return x/y/w/h bounds for context
                    int &X, int &Y, int &W, int &H);
    void change_cursor(Fl_Cursor newcursor);	// change mouse cursor to some other shape
    TableContext cursor2rowcol(int &R, int &C, ResizeFlag &resizeflag);
						// find r/c given current x/y event
    int find_cell(TableContext context,		// find cell's x/y/w/h given r/c
    		 int R, int C, int &X, int &Y, int &W, int &H);
    int row_col_clamp(TableContext context, int &R, int &C);
    						// clamp r/c to known universe

    // Called to draw cells
    virtual void draw_cell(TableContext context, int R=0, int C=0, 
    			   int X=0, int Y=0, int W=0, int H=0)
	{ }					// overridden by deriving class

    long row_scroll_position(int row);		// find scroll position of row (in pixels)
    long col_scroll_position(int col);		// find scroll position of col (in pixels)

    int is_fltk_container() 			// does table contain fltk widgets?
        { return( Fl_Group::children() > 3 ); }	// (ie. more than box and 2 scrollbars?)

    static void scroll_cb(Fl_Widget*,void*);	// h/v scrollbar callback

    void redraw_range(int toprow, int botrow, int leftcol, int rightcol)
    {
        if ( _redraw_toprow == -1 ) 
	{
	    // Initialize redraw range
	    _redraw_toprow = toprow;
	    _redraw_botrow = botrow;
	    _redraw_leftcol = leftcol;
	    _redraw_rightcol = rightcol;
	}
	else
	{
	    // Extend redraw range
	    if ( toprow < _redraw_toprow ) _redraw_toprow = toprow;
	    if ( botrow > _redraw_botrow ) _redraw_botrow = botrow;
	    if ( leftcol < _redraw_leftcol ) _redraw_leftcol = leftcol;
	    if ( rightcol > _redraw_rightcol ) _redraw_rightcol = rightcol;
	}

	// Indicate partial redraw needed of some cells
	damage(FL_DAMAGE_CHILD);
    }

public:
    Fl_Table(int X, int Y, int W, int H, const char *l=0);
    ~Fl_Table();

    virtual void clear() { rows(0); cols(0); }

    // topline()
    // middleline()
    // bottomline()

    inline void table_box(Fl_Boxtype val) { table->box(val); table_resized(); }
    inline Fl_Boxtype table_box( void ) { return(table->box()); }

    virtual void rows(int val);				// set/get number of rows
    inline int rows() 
        { return(_rows); }

    virtual void cols(int val);				// set/get number of columns
    inline int cols()
        { return(_cols); }

    inline void visible_cells(int& r1, int& r2, int& c1, int& c2)
        { r1 = toprow; r2 = botrow; c1 = leftcol; c2 = rightcol; }

    // Interactive resizing happening?
    int is_interactive_resize()
        { return(_resizing_row != -1 || _resizing_col != -1); }

    inline int row_resize()
        { return(_row_resize); }
    void row_resize(int flag)			// enable row resizing
        { _row_resize = flag; }

    inline int col_resize()
        { return(_col_resize); }
    void col_resize(int flag)			// enable col resizing
        { _col_resize = flag; }

    inline int col_resize_min()			// column minimum resizing width
        { return(_col_resize_min); }
    void col_resize_min(int val)
        { _col_resize_min = ( val < 1 ) ? 1 : val; }

    inline int row_resize_min()			// column minimum resizing width
        { return(_row_resize_min); }
    void row_resize_min(int val)
        { _row_resize_min = ( val < 1 ) ? 1 : val; }

    inline int row_header()			// set/get row header enable flag
        { return(_row_header); }
    void row_header(int flag)
        { _row_header = flag; table_resized(); redraw(); }

    inline int col_header()			// set/get col header enable flag
        { return(_col_header); }
    void col_header(int flag)
        { _col_header = flag; table_resized(); redraw(); }

    inline void col_header_height(int height)	// set/get col header height
        { _col_header_h = height; table_resized(); redraw(); }
    inline int col_header_height()
        { return(_col_header_h); }

    inline void row_header_width(int width)	// set/get row header width
        { _row_header_w = width; table_resized(); redraw(); }
    inline int row_header_width()
        { return(_row_header_w); }

    inline void row_header_color(Fl_Color val)	// set/get row header color
        { _row_header_color = val; redraw(); }
    inline Fl_Color row_header_color()
        { return(_row_header_color); }

    inline void col_header_color(Fl_Color val)	// set/get col header color
        { _col_header_color = val; redraw(); }
    inline Fl_Color col_header_color()
        { return(_col_header_color); }

    void row_height(int row, int height);	// set/get row height
    inline int row_height(int row)
	{ return((row<0 || row>=(int)_rowheights.size()) ? 0 : _rowheights[row]); }

    void col_width(int col, int width);		// set/get a column's width
    inline int col_width(int col)
	{ return((col<0 || col>=(int)_colwidths.size()) ? 0 : _colwidths[col]); }

    void row_height_all(int height)		// set all row/col heights
        { for ( int r=0; r<rows(); r++ ) row_height(r, height); }
    void col_width_all(int width)
        { for ( int c=0; c<cols(); c++ ) col_width(c, width); }

    void row_position(int row);			// set/get table's current scroll position
    void col_position(int col);
    int row_position()				// current row position
	{ return(_row_position); }
    int col_position()				// current col position
	{ return(_col_position); }

    inline void top_row(int row)		// set/get top row (deprecated)
        { row_position(row); }
    inline int top_row()
        { return(row_position()); }

    void resize(int X, int Y, int W, int H);	// fltk resize() override
    void draw(void);				// fltk draw() override

    // Child group
    void init_sizes() { table->init_sizes(); table->redraw(); }
    void add(Fl_Widget& w) { table->add(w); }
    void add(Fl_Widget* w) { table->add(w); }
    void insert(Fl_Widget& w, int n) { table->insert(w,n); }
    void insert(Fl_Widget& w, Fl_Widget* w2) { table->insert(w,w2); }
    void remove(Fl_Widget& w) { table->remove(w); }
    void begin() { table->begin(); }
    void end() 
    {
        table->end();

	// HACK: Avoid showing Fl_Scroll; seems to erase screen
	//       causing unnecessary flicker, even if its box() is FL_NO_BOX.
	//
	if ( table->children() > 2 ) { table->show(); }
	else { table->hide(); }

	Fl_Group::current((Fl_Group*)(Fl_Group::parent()));
    }
    Fl_Widget * const *array()
        { return(table->array()); }
    Fl_Widget *child(int n) const
        { return(table->child(n)); }
    int children() const 
        { return(table->children()-2); }    // -2: skip Fl_Scroll's h/v scrollbar widgets
    int find(const Fl_Widget *w) const 
        { return(table->find(w)); }
    int find(const Fl_Widget &w) const 
        { return(table->find(w)); }

    // CALLBACKS
    int callback_row() { return(_callback_row); }
    int callback_col() { return(_callback_col); }
    TableContext callback_context() { return(_callback_context); }
    void do_callback(TableContext context, int row, int col)
    {
	_callback_context = context;
	_callback_row = row;
	_callback_col = col;
	Fl_Widget::do_callback();
    }
};

#define CONTEXT_NEWPAGE CONTEXT_STARTPAGE		// NEWPAGE deprecated

#endif /*_FL_TABLE_H*/
