root/trunk/FRII/gui/ColorPatch.hh

/*
 * This file is part of the FamilyRelations II source distribution.
 *
 * FamilyRelations II is part of the FamilyJewels package for comparative
 * sequence analysis: http://family.caltech.edu/.
 *
 * Contact author: C. Titus Brown, titus@caltech.edu.
 *
 * This program and all associated source code files are Copyright (C) 2003,
 * 2004 the California Institute of Technology, Pasadena, CA, 91125 USA.  It
 * is under the Lesser GNU Public License; please see the included
 * LICENSE.txt file for more information, or contact Titus directly.
 *
 */

// Interface and implementation for a color display/chooser.

#ifndef COLOR_PATCH_HH
#define COLOR_PATCH_HH

#include <FL/Fl.H>
#include <FL/fl_draw.H>
#include <FL/Fl_Box.H>
#include <FL/fl_show_colormap.H>

#include <vector>

namespace gui {

  //
  // ColorChangeListener_
  //

  class ColorChangeListener_ {
  protected:
    ColorChangeListener_() { };
  public:
                              virtual ~ColorChangeListener_() { };
    virtual void notify(Fl_Color c) = 0;
  };

  //
  // class ColorPatch
  //

  class ColorPatch : public Fl_Box {
  protected:
    std::vector<ColorChangeListener_*> _to_notify_list;
    Fl_Color _color;

    // Just draw a box of color.
    void draw() { fl_color(color()); fl_rectf(x(), y(), w(), h()); }

    // When clicked on, bring up a window with a color chooser.
    int handle(int e) {
      if (e == FL_PUSH) {
        // CTB -- I don't know how to make the colormap stay up.  Hmm.
        Fl_Color old_color = color();
        Fl_Color new_color = fl_show_colormap(old_color);
        if (new_color != old_color) {
          color(new_color);
          redraw();
          notify_changed();
        }

        return 1;
      } else {
        return Fl_Widget::handle(e);
      }
    }

    void notify_changed() {
      Fl_Color c = color();
      for (unsigned int i = 0; i < _to_notify_list.size(); i++) {
        _to_notify_list[i]->notify(c);
      }
    }
  public:
    // Constructor: take normal Fl_Box parameters + a color.
    ColorPatch(int x, int y, int w, int h, Fl_Color c) :
      Fl_Box(x, y, w, h), _color(c) {
      color(_color);
    };

    virtual ~ColorPatch() { };

    void add_change_listener(ColorChangeListener_* l) {
      _to_notify_list.push_back(l);
    }
  };
}

#endif // COLOR_PATCH_HH