led-indicator.cc

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2013-2023 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.
//
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// 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
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////////////////////////////////////////////////////////////////////////
 
#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif
 
#include <QColor>
 
#include "gui-utils.h"
#include "led-indicator.h"
 
OCTAVE_BEGIN_NAMESPACE(octave)
 
led_indicator::led_indicator (led_state initial_state, QWidget *p)
: QLabel (p)
{
  setFixedSize(12, 12);
  set_state (initial_state);
}
 
void led_indicator::set_state (led_state state)
{
  QColor col (Qt::gray);
 
  switch (state)
    {
    case LED_STATE_NO:
      break;
 
    case LED_STATE_INACTIVE:
      col = QColor (Qt::darkGray);
      col.setRedF (col.redF () * 1.25);
      break;
 
    case LED_STATE_ACTIVE:
      col = QColor (Qt::red);
      break;
    }
 
  setStyleSheet (style_sheet (col));
}
 
QString led_indicator::style_sheet (const QColor& col)
{
  QColor col_light = interpolate_color (col, QColor (Qt::white), 0.25, 0.9);
 
  const QString style = QString (
                                 "border-radius: %1; background-color: "
                                 "qlineargradient(spread:pad, x1:0.2, y1:0.2, x2:1, y2:1, stop:0 "
                                 "%2, stop:1 %3);"
                                 ).arg (width ()/2).arg (col_light.name ()).arg (col.name ());
 
  return style;
}
 
OCTAVE_END_NAMESPACE(octave)