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) 2013-2022 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// 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
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////
 
#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif
 
#include "color-picker.h"
 
namespace octave
{
  // Constructor with initial color as parameter
  color_picker::color_picker (QColor old_color, QWidget *p)
    : QPushButton (p)
  {
    m_color = old_color;
    setFlat (true);
    setFocusPolicy (Qt::NoFocus);  // no focus, would change the color
    update_button ();
    connect (this, &color_picker::clicked, this, &color_picker::select_color);
  }
 
  // Slot for button clicked: select a new color using QColorDialog
  void color_picker::select_color (void)
  {
    QColor new_color = QColorDialog::getColor (m_color);
 
    if (new_color.isValid () && new_color != m_color)
      {
        m_color = new_color;
        update_button ();
      }
  }
 
  // Set the color of the button
  void color_picker::set_color (QColor new_color)
  {
    m_color = new_color;
    update_button ();
  }
 
  // Draw the button with the actual color (using a stylesheet)
  void color_picker::update_button (void)
  {
    // 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"));
 
    setStyleSheet (QString ("background-color: %1; border: 1px solid %2;")
                   .arg (m_color.name ())
                   .arg (bordercolor));
 
    repaint ();
  }
}