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Fl_Table_Row.cxx

//
// Fl_Table_Row -- A row oriented table widget
//
//    A class specializing in a table of rows.
//    Handles row-specific selection behavior.
//
// 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 Row headings (only column headings supported currently)
//

#include <FL/Fl.H>
#include <FL/fl_draw.H>
#include "Fl_Table_Row.H"

// Is row selected?
int Fl_Table_Row::row_selected(int row)
{
    if ( row < 0 || row >= rows() ) return(-1);
    return(_rowselect[row]);
}

// Change selection state for row
//
//     flag:
//        0 - clear selection
//        1 - set selection
//        2 - toggle selection
//
//     Returns:
//        0 - selection state did not change
//        1 - selection state changed
//       -1 - row out of range
//
int Fl_Table_Row::select_row(int row, int flag)
{
    if ( row < 0 || row >= rows() ) { return(-1); }

    int oldval = _rowselect[row];
    if ( flag == 2 ) { _rowselect[row] ^= 1; }
    else             { _rowselect[row] = flag; }

    if ( _rowselect[row] != oldval )            // select state changed?
    {
      if ( row >= toprow && row <= botrow )     // row visible?
      {
          // Extend partial redraw range
          redraw_range(row, row, leftcol, rightcol);
      }
      return(1);
    }
    return(0);
}

// Select all rows to a known state
void Fl_Table_Row::select_all_rows(int flag)
{
    char changed = 0;
    if ( flag == 2 )
    {
      for ( int row=0; row<(int)_rowselect.size(); row++ )
          { _rowselect[row] ^= 1; }
      changed = 1;
    }
    else
    {
      for ( int row=0; row<(int)_rowselect.size(); row++ )
      {
          changed |= (_rowselect[row] != flag)?1:0;
          _rowselect[row] = flag; 
      }
    }
    if ( changed )
        { redraw(); }
}

// Set number of rows
void Fl_Table_Row::rows(int val)
{
    Fl_Table::rows(val);
    while ( val > (int)_rowselect.size() ) { _rowselect.push_back(0); } // enlarge
    while ( val < (int)_rowselect.size() ) { _rowselect.pop_back(); }   // shrink
}

// #include "eventnames.h"          // debugging
// #include <stdio.h>

// Handle events
int Fl_Table_Row::handle(int event)
{
//    fprintf(stderr, "** EVENT: %s: EVENT XY=%d,%d\n", 
//        eventnames[event], Fl::event_x(), Fl::event_y()); // debugging

    // Let base class handle event
    int ret = Fl_Table::handle(event);

    // The following code disables cell selection.. why was it added? -erco 05/18/03
    // if ( ret ) { _last_y = Fl::event_y(); return(1); }   // base class 'handled' it (eg. column resize)

    int shiftstate = (Fl::event_state() & FL_CTRL) ? FL_CTRL :
                     (Fl::event_state() & FL_SHIFT) ? FL_SHIFT : 0;

    // 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:

          if ( Fl::event_button() == 1 )
          {
            _last_push_x = Fl::event_x(); // save regardless of context
            _last_push_y = Fl::event_y(); // " "

            // Handle selection in table.
            //     Select cell under cursor, and enable drag selection mode.
            //
            if ( context == CONTEXT_CELL )
            {
                // Ctrl key? Toggle selection state
                switch ( shiftstate )
                {
                  case FL_CTRL:
                      select_row(R, 2);   // toggle
                      break;

                  case FL_SHIFT:
                  {
                      select_row(R, 1);
                      if ( _last_row > -1 )
                      {
                        int srow = R, erow = _last_row;
                        if ( srow > erow ) 
                            { srow = _last_row; erow = R; }
                        for ( int row = srow; row <= erow; row++ )
                            { select_row(row, 1); }
                      }
                      break;
                   }

                   default:
                      select_all_rows(0); // clear all previous selections
                      select_row(R, 1);
                      break;
                }

                _last_row = R;
                _dragging_select = 1;
                ret = 1;      // FL_PUSH handled (ensures FL_DRAG will be sent)
                // redraw();  // redraw() handled by select_row()
            }
          }

          break;

        case FL_DRAG:
      {
          if ( _dragging_select )
          {
            // Dragged off table edges? Handle scrolling
            int offtop = toy - _last_y,               // >0 if off top of table
                offbot = _last_y - (toy + toh);       // >0 if off bottom of table

              if ( offtop > 0 && row_position() > 0 )
            {
                // Only scroll in upward direction
                int diff = _last_y - Fl::event_y();
                if ( diff < 1 )
                  { ret = 1; break; }
                row_position(row_position() - diff);
                context = CONTEXT_CELL; C = 0; R = row_position();  // HACK: fake it
                if ( R < 0 || R > rows() ) { ret = 1; break; }      // HACK: ugly
            }
            else if ( offbot > 0 && botrow < rows() )
            {
                // Only scroll in downward direction
                int diff = Fl::event_y() - _last_y;
                if ( diff < 1 )
                  { ret = 1; break; }
                row_position(row_position() + diff);
                context = CONTEXT_CELL; C = 0; R = botrow;        // HACK: fake it
                if ( R < 0 || R > rows() ) { ret = 1; break; }    // HACK: ugly
            }

            if ( context == CONTEXT_CELL )
            {
                switch ( shiftstate )
                {
                  case FL_CTRL:
                      if ( R != _last_row )      // toggle if dragged to new row
                        { select_row(R, 2); }  // 2=toggle
                      break;

                  case FL_SHIFT:
                  default:
                      select_row(R, 1);
                      if ( _last_row > -1 )
                      {
                        int srow = R, erow = _last_row;
                        if ( srow > erow ) 
                            { srow = _last_row; erow = R; }
                        for ( int row = srow; row <= erow; row++ )
                            { select_row(row, 1); }
                      }
                      break;
                }
                ret = 1;                        // drag handled
                _last_row = R;
            }
          }
          break;
      }

      case FL_RELEASE:
          if ( Fl::event_button() == 1 )
          {
            _dragging_select = 0;
            ret = 1;                // release handled

            // Clicked off edges of data table? 
            //    A way for user to clear the current selection.
            //
            int databot = tiy + table_h,
                dataright = tix + table_w;
            if ( 
                ( _last_push_x > dataright && Fl::event_x() > dataright )
                ||
                ( _last_push_y > databot && Fl::event_y() > databot )
               )
            {
                select_all_rows(0);             // clear previous selections
            }
          }
          break;

      default:
          break;
    }
    _last_y = Fl::event_y();
    return(ret);
}

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