color-picker.cc

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//
// This class provides a simple color picker based on tQColorButton
// by Harald Jedele, 23.03.01, GPL version 2 or any later version.
//
// Copyright (C) FZI Forschungszentrum Informatik Karlsruhe
// Copyright (C) 2013-2015 Torsten
//
// This file is part of Octave.
//
// Octave is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3 of the License, or (at your
// option) any later version.
//
// Octave 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 General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <http://www.gnu.org/licenses/>.
//

// Author: Torsten <ttl@justmail.de>

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "color-picker.h"

// constuctor with initial color as parameter
color_picker::color_picker (QColor old_color, QWidget* p) : QPushButton (p)
{
  _color = old_color;
  setFlat (true);
  setFocusPolicy (Qt::NoFocus);  // no focus, would changes the color
  update_button ();
  connect (this, SIGNAL (clicked ()), SLOT (select_color ()));
}

// slot for bitton clicked: selct a new color using QColorDialog
void
color_picker::select_color ()
{
  QColor new_color = QColorDialog::getColor (_color);
  if (new_color.isValid () && new_color != _color)
    {
      _color = new_color;
      update_button ();
    }
}

// draw the button with the actual color (using a stylesheet)
void color_picker::update_button ()
{
  // Is this the right place to look for a "foreground" color that would
  // provide a reasonable border for the color swatches?
  QWidget *p = parentWidget ();

  QString bordercolor
    = p ? p->palette ().text ().color ().name () : QString ("#000000");

  QString css = QString ("background-color: %1; border: 1px solid %2;")
                .arg (_color.name ())
                .arg (bordercolor);

  setStyleSheet (css);
  repaint ();
}