fltk/examples/table-as-container.cxx

//
//      Show how FLTK widgets can be parented by Fl_Table. -erco 03/30/2003
//
//      Originally the 'widgettable.cxx' example program that came with
//      erco's Fl_Table widget. Added to FLTK in 2010.
//
//      This demonstrates how to use Fl_Table as a 'container' for FLTK
//      widgets; one widget per cell. This isn't optimal for large tables,
//      where it's better to make one instance of a widget, and move it to
//      where it's needed. For an example of this, see the example program
//      "table-spreadsheet.cxx".
//
// Copyright 2010 Greg Ercolano.
// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file.  If this
// file is missing or damaged, see the license at:
//
//     https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
//     https://www.fltk.org/bugs.php
//

#include <stdio.h>
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Light_Button.H>
#include <FL/Fl_Input.H>
#include <FL/fl_draw.H>
#include <FL/Fl_Table.H>

void button_cb(Fl_Widget *w, void*);

//
// Simple demonstration class deriving from Fl_Table
//
class WidgetTable : public Fl_Table {
protected:
  void draw_cell(TableContext context,                  // table cell drawing
                 int R=0, int C=0, int X=0, int Y=0, int W=0, int H=0) FL_OVERRIDE;

public:
  WidgetTable(int x, int y, int w, int h, const char *l=0) : Fl_Table(x,y,w,h,l) {
    col_header(1);
    col_resize(1);
    col_header_height(25);
    row_header(1);
    row_resize(1);
    row_header_width(80);
    end();
  }
  ~WidgetTable() { }

  void SetSize(int newrows, int newcols) {
    clear();            // clear any previous widgets, if any
    rows(newrows);
    cols(newcols);

    begin();            // start adding widgets to group
    {
      for ( int r = 0; r<newrows; r++ ) {
        for ( int c = 0; c<newcols; c++ ) {
          int X,Y,W,H;
          find_cell(CONTEXT_TABLE, r, c, X, Y, W, H);

          char s[40];
          if ( c & 1 ) {
            // Create the input widgets
            sprintf(s, "%d.%d", r, c);
            Fl_Input *in = new Fl_Input(X,Y,W,H);
            in->value(s);
          } else {
            // Create the light buttons
            sprintf(s, "%d/%d ", r, c);
            Fl_Light_Button *butt = new Fl_Light_Button(X,Y,W,H);
            butt->copy_label(s);
            butt->align(FL_ALIGN_CENTER|FL_ALIGN_INSIDE);
            butt->callback(button_cb, (void*)0);
            butt->value( ((r+c*2) & 4 ) ? 1 : 0);
          }
        }
      }
    }
    end();
  }
};

// Handle drawing all cells in table
void WidgetTable::draw_cell(TableContext context,
                          int R, int C, int X, int Y, int W, int H) {
  switch ( context ) {
    case CONTEXT_STARTPAGE:
      fl_font(FL_HELVETICA, 12);                // font used by all headers
      break;

    case CONTEXT_RC_RESIZE: {
      int X, Y, W, H;
      int index = 0;
      for ( int r = 0; r<rows(); r++ ) {
        for ( int c = 0; c<cols(); c++ ) {
          if ( index >= children() ) break;
          find_cell(CONTEXT_TABLE, r, c, X, Y, W, H);
          child(index++)->resize(X,Y,W,H);
        }
      }
      init_sizes();                     // tell group children resized
      return;
    }

    case CONTEXT_ROW_HEADER:
      fl_push_clip(X, Y, W, H);
      {
        static char s[40];
        sprintf(s, "Row %d", R);
        fl_draw_box(FL_THIN_UP_BOX, X, Y, W, H, row_header_color());
        fl_color(FL_BLACK);
        fl_draw(s, X, Y, W, H, FL_ALIGN_CENTER);
      }
      fl_pop_clip();
      return;

    case CONTEXT_COL_HEADER:
      fl_push_clip(X, Y, W, H);
      {
        static char s[40];
        sprintf(s, "Column %d", C);
        fl_draw_box(FL_THIN_UP_BOX, X, Y, W, H, col_header_color());
        fl_color(FL_BLACK);
        fl_draw(s, X, Y, W, H, FL_ALIGN_CENTER);
      }
      fl_pop_clip();
      return;

    case CONTEXT_CELL:
      return;           // fltk handles drawing the widgets

    default:
      return;
  }
}

void button_cb(Fl_Widget *w, void*) {
  fprintf(stderr, "BUTTON: %s\n", (const char*)w->label());
}

int main() {
  Fl_Double_Window win(940, 500, "table as container");
  WidgetTable table(20, 20, win.w()-40, win.h()-40, "FLTK widget table");
  table.SetSize(50, 50);
  win.end();
  win.resizable(table);
  win.show();
  return(Fl::run());
}