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Fl_Table.cxx

//
// 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".
//

#include <stdio.h>            // fprintf
#include <FL/fl_draw.H>
#include "Fl_Table.H"

#define SCROLLBAR_SIZE  16

// Scroll display so 'row' is at top
void Fl_Table::row_position(int row)
{
    if ( _row_position == row ) return;   // OPTIMIZATION: no change? avoid redraw
    if ( row < 0 ) row = 0;
    else if ( row >= rows() ) row = rows() - 1;
    if ( table_h <= tih ) return;   // don't scroll if table smaller than window
    double newtop = row_scroll_position(row);
    if ( newtop > vscrollbar->maximum() ) 
        { newtop = vscrollbar->maximum(); }
    vscrollbar->Fl_Slider::value(newtop);
    table_scrolled();
    redraw();
    _row_position = row;            // HACK: override what table_scrolled() came up with
}

// Scroll display so 'col' is at left
void Fl_Table::col_position(int col)
{
    if ( _col_position == col ) return;   // OPTIMIZATION: no change? avoid redraw
    if ( col < 0 ) col = 0;
    else if ( col >= cols() ) col = cols() - 1;
    if ( table_w <= tiw ) return;   // don't scroll if table smaller than window
    double newleft = col_scroll_position(col);
    if ( newleft > hscrollbar->maximum() ) 
        { newleft = hscrollbar->maximum(); }
    hscrollbar->Fl_Slider::value(newleft);
    table_scrolled();
    redraw();
    _col_position = col;            // HACK: override what table_scrolled() came up with
}

// Find scroll position of a row (in pixels)
long Fl_Table::row_scroll_position(int row)
{
    int startrow = 0;
    long scroll = 0;

    // OPTIMIZATION: 
    //     Attempt to use precomputed row scroll position
    if ( toprow_scrollpos != -1 && row >= toprow )
      { scroll = toprow_scrollpos; startrow = toprow; }

    for ( int t=startrow; t<row; t++ )
      scroll += row_height(t);
    return(scroll);
}

// Find scroll position of a column (in pixels)
long Fl_Table::col_scroll_position(int col)
{
    int startcol = 0;
    long scroll = 0;

    // OPTIMIZATION: 
    //     Attempt to use precomputed row scroll position
    if ( leftcol_scrollpos != -1 && col >= leftcol )
      { scroll = leftcol_scrollpos; startcol = leftcol; }

    for ( int t=startcol; t<col; t++ )
        scroll += col_width(t);
    return(scroll);
}

// Ctor
Fl_Table::Fl_Table(int X, int Y, int W, int H, const char *l) : Fl_Group(X,Y,W,H,l)
{
    _rows             = 0;
    _cols             = 0;
    _row_header_w     = 40;
    _col_header_h     = 18;
    _row_header       = 0;
    _col_header       = 0;
    _row_header_color = color();
    _col_header_color = color();
    _row_resize       = 0;
    _col_resize       = 0;
    _row_resize_min   = 1;
    _col_resize_min   = 1;
    _redraw_toprow    = -1;
    _redraw_botrow    = -1;
    _redraw_leftcol   = -1;
    _redraw_rightcol  = -1;
    table_w           = 0;
    table_h           = 0;
    toprow            = 0;
    botrow            = 0;
    leftcol           = 0;
    rightcol          = 0;
    toprow_scrollpos  = -1;
    leftcol_scrollpos = -1;
    _last_cursor      = FL_CURSOR_DEFAULT;
    _resizing_col     = -1;
    _resizing_row     = -1;
    _dragging_x       = -1;
    _dragging_y       = -1;
    _last_row         = -1;

    box(FL_THIN_DOWN_FRAME);

    vscrollbar = new Fl_Scrollbar(x()+w()-SCROLLBAR_SIZE, y(), SCROLLBAR_SIZE, h()-SCROLLBAR_SIZE);
    vscrollbar->type(FL_VERTICAL);
    vscrollbar->callback(scroll_cb, (void*)this);

    hscrollbar = new Fl_Scrollbar(x(), y()+h()-SCROLLBAR_SIZE, w(), SCROLLBAR_SIZE);
    hscrollbar->type(FL_HORIZONTAL);
    hscrollbar->callback(scroll_cb, (void*)this);

    table = new Fl_Scroll(x(), y(), w(), h());
    table->box(FL_NO_BOX);
    table->type(0);           // don't show Fl_Scroll's scrollbars -- use our own
    table->hide();            // hide unless children are present
    table->end();

    table_resized();
    redraw();

    Fl_Group::end();          // end the group's begin()

    table->begin();           // leave with fltk children getting added to the scroll
}

// Dtor
Fl_Table::~Fl_Table()
{
    // The parent Fl_Group takes care of destroying scrollbars
}

// Set height of a row
void Fl_Table::row_height(int row, int height)
{
    if ( row < 0 ) return;
    if ( row < (int)_rowheights.size() && _rowheights[row] == height ) 
        { return; }           // OPTIMIZATION: no change? avoid redraw
    // Add row heights, even if none yet
    while ( row >= (int)_rowheights.size() )
        { _rowheights.push_back(height); }
    _rowheights[row] = height;
    table_resized();
    if ( row <= botrow )      // OPTIMIZATION: only redraw if onscreen or above screen
      { redraw(); }

    // ROW RESIZE CALLBACK
    if ( Fl_Widget::callback() && when() & FL_WHEN_CHANGED )
      { do_callback(CONTEXT_RC_RESIZE, row, 0); }
}

// Set width of a column
void Fl_Table::col_width(int col, int width)
{
    if ( col < 0 ) return;
    if ( col < (int)_colwidths.size() && _colwidths[col] == width ) 
        { return; }           // OPTIMIZATION: no change? avoid redraw

    // Add column widths, even if none yet
    while ( col >= (int)_colwidths.size() )
        { _colwidths.push_back(width); }

    _colwidths[col] = width;
    table_resized();
    if ( col <= rightcol )    // OPTIMIZATION: only redraw if onscreen or to the left
      { redraw(); }

    // COLUMN RESIZE CALLBACK
    if ( Fl_Widget::callback() && when() & FL_WHEN_CHANGED )
      { do_callback(CONTEXT_RC_RESIZE, 0, col); }
}

// Return row/col clamped to reality
int Fl_Table::row_col_clamp(TableContext context, int &R, int &C)
{
    int clamped = 0;
    if ( R < 0 ) { R = 0; clamped = 1; }
    if ( C < 0 ) { C = 0; clamped = 1; }
    switch ( context )
    {
      case CONTEXT_COL_HEADER:
          // Allow col headers to draw even if no rows
          if ( R >= _rows && R != 0 ) { R = _rows - 1; clamped = 1; }
          break;

      case CONTEXT_ROW_HEADER:
          // Allow row headers to draw even if no columns
          if ( C >= _cols && C != 0 ) { C = _cols - 1; clamped = 1; }
          break;

        case CONTEXT_CELL:
      default:
          // CLAMP R/C TO _rows/_cols
          if ( R >= _rows ) { R = _rows - 1; clamped = 1; }
          if ( C >= _cols ) { C = _cols - 1; clamped = 1; }
          break;
    }
    return(clamped);
}

// Return bounding region for given context
void Fl_Table::get_bounds(TableContext context, int &X, int &Y, int &W, int &H)
{
    switch ( context )
    {
        case CONTEXT_COL_HEADER:

          // Column header clipping.
          X = tox;
          Y = wiy;
          W = tow;
          H = col_header_height();
          return;

        case CONTEXT_ROW_HEADER:

          // Row header clipping.
          X = wix;
          Y = toy;
          W = row_header_width();
          H = toh;
          return;

      case CONTEXT_TABLE:

          // Table inner dimensions
          X = tix; Y = tiy; W = tiw; H = tih;
          return;

      // TODO: Add other contexts..
      default:
          fprintf(stderr, "Fl_Table::get_bounds(): context %d unimplemented\n", (int)context);
          return;
    }
    //NOTREACHED
}

// Find row/col beneath cursor
//
//    Returns R/C and context.
//    Also returns resizeflag, if mouse is hovered over a resize boundary.
//
Fl_Table::TableContext Fl_Table::cursor2rowcol(int &R, int &C, ResizeFlag &resizeflag)
{
    // return values
    R = C = 0;
    resizeflag = RESIZE_NONE;

    int X, Y, W, H;

    // Row header?
    if ( row_header() )
    {
      // Inside a row heading?
      get_bounds(CONTEXT_ROW_HEADER, X, Y, W, H);
      if ( Fl::event_inside(X, Y, W, H) )
      {
          // Scan visible rows until found
          for ( R = toprow; R <= botrow; R++ )
          {
            find_cell(CONTEXT_ROW_HEADER, R, 0, X, Y, W, H);
            if ( Fl::event_y() >= Y && Fl::event_y() < (Y+H) )
            {
                // Found row?
                //     If cursor over resize boundary, and resize enabled,
                //     enable the appropriate resize flag.
                //
                if ( row_resize() )
                {
                    if ( Fl::event_y() <= (Y+3-0) ) { resizeflag = RESIZE_ROW_ABOVE; }
                    if ( Fl::event_y() >= (Y+H-3) ) { resizeflag = RESIZE_ROW_BELOW; }
                }
                return(CONTEXT_ROW_HEADER);
            }
          }

          // Must be in row header dead zone
          return(CONTEXT_NONE);
      }
    }

    // Column header?
    if ( col_header() )
    {
      // Inside a column heading?
        get_bounds(CONTEXT_COL_HEADER, X, Y, W, H);
      if ( Fl::event_inside(X, Y, W, H) )
      {
          // Scan visible columns until found
          for ( C = leftcol; C <= rightcol; C++ )
          {
            find_cell(CONTEXT_COL_HEADER, 0, C, X, Y, W, H);
            if ( Fl::event_x() >= X && Fl::event_x() < (X+W) )
            {
                // Found column?
                //     If cursor over resize boundary, and resize enabled,
                //     enable the appropriate resize flag.
                //
                if ( col_resize() )
                {
                    if ( Fl::event_x() <= (X+3-0) ) { resizeflag = RESIZE_COL_LEFT; }
                    if ( Fl::event_x() >= (X+W-3) ) { resizeflag = RESIZE_COL_RIGHT; }
                }
                return(CONTEXT_COL_HEADER);
            }
          }

          // Must be in column header dead zone
          return(CONTEXT_NONE);
      }
    }

    // Mouse somewhere in table?
    //     Scan visible r/c's until we find it.
    //
    if ( Fl::event_inside(tox, toy, tow, toh) )
    {
      for ( R = toprow; R <= botrow; R++ )
      {
          find_cell(CONTEXT_CELL, R, C, X, Y, W, H);
          if ( Fl::event_y() < Y ) break;       // OPT: thanks lars
          if ( Fl::event_y() >= (Y+H) ) continue;     // OPT: " "
          for ( C = leftcol; C <= rightcol; C++ )
          {
            find_cell(CONTEXT_CELL, R, C, X, Y, W, H);
            if ( Fl::event_inside(X, Y, W, H) )
                { return(CONTEXT_CELL); } // found it
          }
      }
      // Must be in a dead zone of the table
      R = C = 0;
      return(CONTEXT_TABLE);
    }

    // Somewhere else
    return(CONTEXT_NONE);
}

// Find X/Y/W/H for cell at R/C
//     If R or C are out of range, returns -1 
//     with X/Y/W/H set to zero.
//
int Fl_Table::find_cell(TableContext context, int R, int C, int &X, int &Y, int &W, int &H)
{
    if ( row_col_clamp(context, R, C) )         // row or col out of range? error
      { X=Y=W=H=0; return(-1); }

    X = col_scroll_position(C) - hscrollbar->value() + tix;
    Y = row_scroll_position(R) - vscrollbar->value() + tiy;
    W = col_width(C);
    H = row_height(R);

    switch ( context )
    {
      case CONTEXT_COL_HEADER:
          Y = wiy;
          H = col_header_height();
          return(0);

      case CONTEXT_ROW_HEADER:
          X = wix;
          W = row_header_width();
          return(0);

      case CONTEXT_CELL:
          return(0);

      case CONTEXT_TABLE:
          return(0);

      // TODO -- HANDLE OTHER CONTEXTS
      default:
          fprintf(stderr, "Fl_Table::find_cell: unknown context %d\n", (int)context);
          return(-1);
    }
    //NOTREACHED
}

// Recalculate the window dimensions
void Fl_Table::recalc_dimensions()
{
    // Recal to* (Table Outer), ti* (Table Inner), wi* ( Widget Inner)
    wix = ( x() + Fl::box_dx(box())); tox = wix; tix = tox + Fl::box_dx(table->box());
    wiy = ( y() + Fl::box_dy(box())); toy = wiy; tiy = toy + Fl::box_dy(table->box());
    wiw = ( w() - Fl::box_dw(box())); tow = wiw; tiw = tow - Fl::box_dw(table->box());
    wih = ( h() - Fl::box_dh(box())); toh = wih; tih = toh - Fl::box_dh(table->box());

    // Trim window if headers enabled
    if ( col_header() )
    {
        tiy += col_header_height(); toy += col_header_height();
      tih -= col_header_height(); toh -= col_header_height();
    }
    if ( row_header() )
    {
        tix += row_header_width(); tox += row_header_width();
      tiw -= row_header_width(); tow -= row_header_width();
    }

    // Make scroll bars disappear if window large enough
    {
      // First pass: can hide via window size?
      int hidev = (table_h <= tih),
          hideh = (table_w <= tiw);

      // Second pass: Check for interference
      if ( !hideh & hidev ) { hidev = (( table_h - tih + SCROLLBAR_SIZE ) <= 0 ); } 
      if ( !hidev & hideh ) { hideh = (( table_w - tiw + SCROLLBAR_SIZE ) <= 0 ); }

      // Determine scrollbar visibility, trim ti[xywh]/to[xywh]
      if ( hidev ) { vscrollbar->hide(); } 
      else { vscrollbar->show(); tiw -= SCROLLBAR_SIZE; tow -= SCROLLBAR_SIZE; }
      if ( hideh ) { hscrollbar->hide(); } 
      else { hscrollbar->show(); tih -= SCROLLBAR_SIZE; toh -= SCROLLBAR_SIZE;}
    }

    // Resize the child table
    table->resize(tox, toy, tow, toh);
    table->init_sizes();
}

// Recalculate internals after a scroll.
//
//    Call this if table has been scrolled or resized.
//    Does not handle redraw().
//    TODO: Assumes ti[xywh] has already been recalculated.
//
void Fl_Table::table_scrolled()
{
    // Top row
    int y, row, voff = vscrollbar->value();
    for ( row=y=0; row < _rows; row++ )
    {
        y += row_height(row);
        if ( y >= voff ) { y -= row_height(row); break; }
    }
    _row_position = toprow = ( row >= _rows ) ? (row - 1) : row;
    toprow_scrollpos = y;     // OPTIMIZATION: save for later use

    // Bottom row
    voff = vscrollbar->value() + tih;
    for ( ; row < _rows; row++ )
    {
        y += row_height(row);
        if ( y >= voff ) { break; }
    }
    botrow = ( row >= _rows ) ? (row - 1) : row;

    // Left column
    int x, col, hoff = hscrollbar->value();
    for ( col=x=0; col < _cols; col++ )
    {
        x += col_width(col);
        if ( x >= hoff ) { x -= col_width(col); break; }
    }
    _col_position = leftcol = ( col >= _cols ) ? (col - 1) : col;
    leftcol_scrollpos = x;    // OPTIMIZATION: save for later use

    // Right column
    //    Work with data left over from leftcol calculation
    //
    hoff = hscrollbar->value() + tiw;
    for ( ; col < _cols; col++ )
    {
        x += col_width(col);
        if ( x >= hoff ) { break; }
    }
    rightcol = ( col >= _cols ) ? (col - 1) : col;

    // First tell children to scroll
    draw_cell(CONTEXT_RC_RESIZE, 0,0,0,0,0,0);
}

// Table resized: recalc internal data
//    Call this whenever the window is resized.
//    Recalculates the scrollbar sizes.
//    Makes no assumptions about any pre-initialized data.
//
void Fl_Table::table_resized()
{
    table_h = row_scroll_position(rows());
    table_w = col_scroll_position(cols());

    recalc_dimensions();

    // Recalc scrollbar sizes
    //    Clamp scrollbar value() after a resize.
    //    Resize scrollbars to enforce a constant trough width after a window resize.
    //
    {
        float vscrolltab = ( table_h == 0 || tih > table_h ) ? 1 : (float)tih / table_h;
        float hscrolltab = ( table_w == 0 || tiw > table_w ) ? 1 : (float)tiw / table_w;

      vscrollbar->bounds(0, table_h-tih);
      vscrollbar->precision(10);
      vscrollbar->slider_size(vscrolltab);
      vscrollbar->resize(wix+wiw-SCROLLBAR_SIZE, wiy,
                     SCROLLBAR_SIZE, wih - ((hscrollbar->visible())?SCROLLBAR_SIZE:0));
      vscrollbar->Fl_Valuator::value(vscrollbar->clamp(vscrollbar->value())); 

      hscrollbar->bounds(0, table_w-tiw);
      hscrollbar->precision(10);
        hscrollbar->slider_size(hscrolltab);
      hscrollbar->resize(wix, wiy+wih-SCROLLBAR_SIZE,
                     wiw - ((vscrollbar->visible())?SCROLLBAR_SIZE:0), SCROLLBAR_SIZE);
      hscrollbar->Fl_Valuator::value(hscrollbar->clamp(hscrollbar->value()));
    }

    // Tell FLTK child widgets were resized
    Fl_Group::init_sizes();

    // Recalc top/bot/left/right
    table_scrolled();

    // DO *NOT* REDRAW -- LEAVE THIS UP TO THE CALLER
    // redraw();
}

// Someone moved a scrollbar
void Fl_Table::scroll_cb(Fl_Widget*w, void *data)
{
    Fl_Table *o = (Fl_Table*)data;
    o->recalc_dimensions();   // recalc tix, tiy, etc.
    o->table_scrolled();
    o->redraw();
}

// Set number of rows
void Fl_Table::rows(int val)
{
    int oldrows = _rows;
    _rows = val;
    {
      int default_h = ( _rowheights.size() > 0 ) ? _rowheights.back() : 25;
      while ( val > (int)_rowheights.size() ) { _rowheights.push_back(default_h); } // enlarge
      while ( val < (int)_rowheights.size() ) { _rowheights.pop_back(); }           // shrink
    }
    table_resized();

    // OPTIMIZATION: redraw only if change is visible.
    if ( val >= oldrows && oldrows > botrow )
        { /* NO REDRAW */ }
    else
        { redraw(); }
}

// Set number of cols
void Fl_Table::cols(int val)
{
    _cols = val;
    {
      int default_w = ( _colwidths.size() > 0 ) ? _colwidths[_colwidths.size()-1] : 80;
      while ( val > (int)_colwidths.size() ) { _colwidths.push_back(default_w); }   // enlarge
      while ( val < (int)_colwidths.size() ) { _colwidths.pop_back(); }       // shrink
    }
    table_resized();
    redraw();
}

// Change mouse cursor to different type
void Fl_Table::change_cursor(Fl_Cursor newcursor)
{
    if ( newcursor != _last_cursor )
    {
      fl_cursor(newcursor, FL_BLACK, FL_WHITE);
      _last_cursor = newcursor;
    }
}

// #define DEBUG 1
#ifdef DEBUG
#include "eventnames.h"
#define PRINTEVENT \
    fprintf(stderr,"Table %s: ** Event: %s --\n", (label()?label():"none"), eventnames[event]);
#else
#define PRINTEVENT
#endif

// Handle FLTK events
int Fl_Table::handle(int event)
{
    PRINTEVENT;

    int ret = Fl_Group::handle(event);    // let FLTK group handle events first

    // Which row/column are we over?
    int R, C;                       // row/column being worked on
    ResizeFlag resizeflag;          // which resizing area are we over? (0=none)
    TableContext context = cursor2rowcol(R, C, resizeflag);

    switch ( event )
    {
      case FL_PUSH:

          // Need this for eg. right click to pop up a menu
          if ( Fl_Widget::callback() &&         // callback defined?
            resizeflag == RESIZE_NONE )         // not resizing?
                { do_callback(context, R, C); } // do callback

          switch ( context )
          {
              case CONTEXT_CELL:

                // FL_PUSH on a cell?
                ret = 1;                  // express interest in FL_RELEASE
                break;

            case CONTEXT_COL_HEADER:

                // FL_PUSH on a column header?
                if ( Fl::event_button() == 1 && resizeflag )
                {
                  // Start resize if left click on column border.
                  //    "ret=1" ensures we get drag events from now on.
                  //    (C-1) is used if mouse is over the left hand side of the cell,
                  //    so that we resize the next column over to the left.
                  //
                  _resizing_col = ( resizeflag & RESIZE_COL_LEFT ) ? C-1 : C; 
                  _resizing_row = -1;
                  _dragging_x = Fl::event_x(); 
                  ret = 1;
                }
                break;

            case CONTEXT_ROW_HEADER:

                // FL_PUSH on a row header?
                if ( Fl::event_button() == 1 && resizeflag )
                {
                  // Start resize if left mouse clicked on row border.
                  //    "ret = 1" ensures we get drag events from now on.
                  //    (R-1) is used if mouse is over the top of the cell,
                  //    so that we resize the row above.
                  //
                  _resizing_row = ( resizeflag & RESIZE_ROW_ABOVE ) ? R-1 : R; 
                  _resizing_col = -1;
                  _dragging_y = Fl::event_y(); 
                  ret = 1;
                }
                break;

            default:
                ret = 0;            // express disinterest
                break;
          }
          _last_row = R;
          break;

        case FL_DRAG:

          if ( _resizing_col > -1 )
          {
            // Dragging column?
            //
            //    Let user drag even /outside/ the row/col widget.
            //    Don't allow column width smaller than 1.
            //    Continue to show FL_CURSOR_WE at all times during drag.
            //
            int offset = _dragging_x - Fl::event_x();
            int new_w = col_width(_resizing_col) - offset;
            if ( new_w < _col_resize_min ) new_w = _col_resize_min;
            col_width(_resizing_col, new_w);
            _dragging_x = Fl::event_x();
            table_resized();
            redraw();
            change_cursor(FL_CURSOR_WE);
            ret = 1;
            if ( Fl_Widget::callback() && when() & FL_WHEN_CHANGED )
                { do_callback(CONTEXT_RC_RESIZE, R, C); }
          }
          else if ( _resizing_row > -1 )
          {
            // Dragging row?
            //
            //    Let user drag even /outside/ the row/col widget.
            //    Don't allow row width smaller than 1.
            //    Continue to show FL_CURSOR_NS at all times during drag.
            //
            int offset = _dragging_y - Fl::event_y();
            int new_h = row_height(_resizing_row) - offset;
            if ( new_h < _row_resize_min ) new_h = _row_resize_min;
            row_height(_resizing_row, new_h);
            _dragging_y = Fl::event_y();
            table_resized();
            redraw();
            change_cursor(FL_CURSOR_NS);
            ret = 1;
            if ( Fl_Widget::callback() && when() & FL_WHEN_CHANGED )
                { do_callback(CONTEXT_RC_RESIZE, R, C); }
          }
          break;

      case FL_RELEASE:

          switch ( context )
          {
            case CONTEXT_ROW_HEADER:      // release on row header
            case CONTEXT_COL_HEADER:      // release on col header
            case CONTEXT_CELL:            // release on a cell
            case CONTEXT_TABLE:           // release on dead zone

                if ( _resizing_col == -1 &&                       // not resizing a column
                   _resizing_row == -1 &&                   // not resizing a row
                     Fl_Widget::callback() &&               // callback defined
                   when() & FL_WHEN_RELEASE &&              // on button release
                   _last_row == R )                   // release on same row PUSHed?
                {
                  // Need this for eg. left clicking on a cell to select it
                  do_callback(context, R, C);
                }
                break;

            default:
                break;
          }

          if ( Fl::event_button() == 1 )
          {
            change_cursor(FL_CURSOR_DEFAULT);
            _resizing_col = -1;
            _resizing_row = -1;
            ret = 1;
          }
          break;

      case FL_MOVE:

          if ( context == CONTEXT_COL_HEADER &&       // in column header?
               resizeflag )                     // resize enabled + near boundary?
            { change_cursor(FL_CURSOR_WE); }    // show resize cursor
          else if ( context == CONTEXT_ROW_HEADER &&  // in row header?
               resizeflag )                     // resize enabled + near boundary?
            { change_cursor(FL_CURSOR_NS); }    // show resize cursor
          else
            { change_cursor(FL_CURSOR_DEFAULT); }     // normal cursor
          ret = 1;
          break;

      case FL_ENTER:          // See FLTK event docs on the FL_ENTER widget
      case FL_LEAVE:          // We want to track the mouse if resizing is allowed.

          if ( resizeflag )
            { ret = 1; }
          if ( event == FL_LEAVE )
            { change_cursor(FL_CURSOR_DEFAULT); }     // normal cursor
          break;

        case FL_FOCUS:
        case FL_UNFOCUS:

          // Currently no interest in keyboard focus. 
          //     This will likely change when we implement keyboard navigation of cells.
          //
          // if (Fl::visible_focus()) 
          //     { ret = 1; }
          break;

      default:

          change_cursor(FL_CURSOR_DEFAULT);
          break;
    }
    return(ret);
}

// Resize FLTK override
//     Handle resize events if user resizes parent window.
//
void Fl_Table::resize(int X, int Y, int W, int H)
{
    // Tell group to resize, and recalc our own widget as well
    Fl_Group::resize(X, Y, W, H);
    table_resized();
    redraw();
}

// Draw a cell
void Fl_Table::_redraw_cell(TableContext context, int r, int c)
{
    if ( r < 0 || c < 0 ) return;
    int X,Y,W,H;
    find_cell(context, r, c, X, Y, W, H); // find positions of cell
    draw_cell(context, r, c, X, Y, W, H); // call users' function to draw it
}

// Draw the entire Fl_Table
//    Override the draw() routine to draw the table.
//    Then tell the group to draw over us.
//
void Fl_Table::draw()
{
    draw_cell(CONTEXT_STARTPAGE, 0, 0,          // let user's drawing routine
            tix, tiy, tiw, tih);          // prep new page

    // Let fltk widgets draw themselves first. Do this after
    // draw_cell(CONTEXT_STARTPAGE) in case user moves widgets around.
    // Use window 'inner' clip to prevent drawing into table border.
    // (unfortunately this clips FLTK's border, so we must draw it explicity below)
    //
    fl_push_clip(wix, wiy, wiw, wih);
    {
        Fl_Group::draw();
    }
    fl_pop_clip();

    // Explicitly draw border around widget, if any
    draw_box(box(), x(), y(), w(), h(), color());

    // If Fl_Scroll 'table' is hidden, draw its box
    //    Do this after Fl_Group::draw() so we draw over scrollbars
    //    that leak around the border.
    //
    if ( ! table->visible() )
    {
      if ( damage() & FL_DAMAGE_ALL || damage() & FL_DAMAGE_CHILD )
          { draw_box(table->box(), tox, toy, tow, toh, table->color()); }
    }

    // Clip all further drawing to the inner widget dimensions
    fl_push_clip(wix, wiy, wiw, wih);
    {
      // Only redraw a few cells?
      if ( ! ( damage() & FL_DAMAGE_ALL ) && _redraw_leftcol != -1 )
      {
          fl_push_clip(tix, tiy, tiw, tih);
          for ( int c = _redraw_leftcol; c <= _redraw_rightcol; c++ )
            for ( int r = _redraw_toprow; r <= _redraw_botrow; r++ )
                { _redraw_cell(CONTEXT_CELL, r, c); }
          fl_pop_clip();
      }

      if ( damage() & FL_DAMAGE_ALL )
      {
          int X,Y,W,H;

          // Draw row headers, if any
          if ( row_header() )
          {
            get_bounds(CONTEXT_ROW_HEADER, X, Y, W, H);
            fl_push_clip(X,Y,W,H);
            for ( int r = toprow; r <= botrow; r++ )
            {
                _redraw_cell(CONTEXT_ROW_HEADER, r, 0);
            }
            fl_pop_clip();
          }

          // Draw column headers, if any
          if ( col_header() )
          {
            get_bounds(CONTEXT_COL_HEADER, X, Y, W, H);
            fl_push_clip(X,Y,W,H);
            for ( int c = leftcol; c <= rightcol; c++ )
            {
                _redraw_cell(CONTEXT_COL_HEADER, 0, c);
            }
            fl_pop_clip();
          }

          // Draw all cells.
          //    This includes cells partially obscured off edges of table.
          //    No longer do this last; you might think it would be nice
          //    to draw over dead zones, but on redraws it flickers. Avoid
          //    drawing over deadzones; prevent deadzones by sizing columns.
          //
          fl_push_clip(tix, tiy, tiw, tih);
          {
            for ( int r = toprow; r <= botrow; r++ )
            {
                for ( int c = leftcol; c <= rightcol; c++ )
                {
                  _redraw_cell(CONTEXT_CELL, r, c);
                }
            }
          }
          fl_pop_clip();

          // Draw little rectangle in corner of headers
          if ( row_header() && col_header() )
            { fl_rectf(wix, wiy, row_header_width(), col_header_height(), color()); }

          // Table has a boxtype? Close those few dead pixels
          if ( table->box() )
          {
            if ( col_header() )
                { fl_rectf(tox, wiy, Fl::box_dx(table->box()), 
                                   col_header_height(), color()); }
            if ( row_header() )
                { fl_rectf(wix, toy, row_header_width(), 
                               Fl::box_dx(table->box()), color()); }
          }

          // Table width smaller than window? Fill remainder with rectangle
          if ( table_w < tiw )
          {
            fl_rectf(tix + table_w, tiy, tiw - table_w, tih, color());

            // Col header? fill that too
            if ( col_header() )
            {
                fl_rectf(tix + table_w, 
                       wiy, 
                       // get that corner just right..
                       (tiw - table_w + Fl::box_dw(table->box()) - 
                                    Fl::box_dx(table->box())),
                       col_header_height(),
                       color());
            }
          }

          // Table height smaller than window? Fill remainder with rectangle
          if ( table_h < tih )
          {
            fl_rectf(tix, tiy + table_h, tiw, tih - table_h, color());

            if ( row_header() )
            {
                // NOTE:
                //     Careful with that lower corner; don't use tih; when eg. 
                //     table->box(FL_THIN_UPFRAME) and hscrollbar hidden, 
                //     leaves a row of dead pixels.
                //
                fl_rectf(wix, tiy + table_h, row_header_width(), 
                       (wiy+wih)-(tiy+table_h)-(hscrollbar->visible()?
                          SCROLLBAR_SIZE:0),
                   color());
            }
          }
      }

      // Both scrollbars? Draw little box in lower right
      if ( vscrollbar->visible() && hscrollbar->visible() )
      {
          fl_rectf(vscrollbar->x(), hscrollbar->y(), 
                   vscrollbar->w(), hscrollbar->h(), color());
      }

      draw_cell(CONTEXT_ENDPAGE, 0, 0,          // let user's drawing
              tix, tiy, tiw, tih);              // routines cleanup

      _redraw_leftcol = _redraw_rightcol = _redraw_toprow = _redraw_botrow = -1;
    }
    fl_pop_clip();
}

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