led-indicator.cc

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////////////////////////////////////////////////////////////////////////
//
// 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.
//
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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"
 
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;
  }
 
}