BionxControl/bcsliderstyle.cpp

/***************************************************************************

  BionxControl
  © 2025 -2026 christoph holzheuer
  christoph.holzheuer@gmail.com

  Using:

  mhs_can_drv.c
  © 2011 - 2023 by MHS-Elektronik GmbH & Co. KG, Germany
  Klaus Demlehner, klaus@mhs-elektronik.de
  @see www.mhs-elektronik.de

  Based on Bionx data type descriptions from:

  BigXionFlasher USB V 0.2.4 rev. 97
  © 2011-2013 by Thomas Koenig <info@bigxionflasher.org>
  @see www.bigxionflasher.org

  Bionx Bike Info
  © 2018 Thorsten Schmidt (tschmidt@ts-soft.de)
  @see www.ts-soft.de

  This program 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.
  @see https://github.com/bikemike/bionx-bikeinfo

 ***************************************************************************/


#include <bcsliderstyle.h>

BCSliderStyle::BCSliderStyle()
    : QProxyStyle()
{

}

int BCSliderStyle::pixelMetric(PixelMetric metric, const QStyleOption* option, const QWidget* widget ) const
{
  switch (metric)
  {
    case PM_SliderThickness:
      return 24;  // Höhe für horizontalen Slider
    case PM_SliderLength:
      return 16;  // Handle-Größe
    case PM_SliderControlThickness:
      return 16;
    case PM_SliderSpaceAvailable:
      if (option)
      {
        if (const QStyleOptionSlider* sliderOpt = qstyleoption_cast<const QStyleOptionSlider*>(option))
        {
          return sliderOpt->rect.width() - 20;
        }
      }
      return QProxyStyle::pixelMetric(metric, option, widget);

    default:
      return QProxyStyle::pixelMetric(metric, option, widget);
  }
}

QRect BCSliderStyle::subControlRect(ComplexControl cc, const QStyleOptionComplex* opt,SubControl sc, const QWidget* widget) const
{
  if (cc == CC_Slider) {
    if (const QStyleOptionSlider* slider = qstyleoption_cast<const QStyleOptionSlider*>(opt))
    {
      QRect rect = slider->rect;
      int handleSize = 16;

      if (sc == SC_SliderHandle) {
        // Handle Position korrekt berechnen
        if (slider->orientation == Qt::Horizontal) {
          int range = slider->maximum - slider->minimum;
          int pos = slider->sliderPosition - slider->minimum;
          int pixelRange = rect.width() - handleSize;
          int pixelPos = (range != 0) ? (pos * pixelRange) / range : 0;

          return QRect(rect.x() + pixelPos,
                       rect.center().y() - handleSize / 2,
                       handleSize, handleSize);
        } else {
          int range = slider->maximum - slider->minimum;
          int pos = slider->sliderPosition - slider->minimum;
          int pixelRange = rect.height() - handleSize;
          int pixelPos = (range != 0) ? (pos * pixelRange) / range : 0;

          return QRect(rect.center().x() - handleSize / 2,
                       rect.bottom() - pixelPos - handleSize,
                       handleSize, handleSize);
        }
      }
    }
  }
  return QProxyStyle::subControlRect(cc, opt, sc, widget);
}

void BCSliderStyle::drawComplexControl(ComplexControl control, const QStyleOptionComplex* option, QPainter* painter, const QWidget* widget) const
{
  if (control == CC_Slider)
  {
    if (const QStyleOptionSlider* slider = qstyleoption_cast<const QStyleOptionSlider*>(option)) {
      painter->setRenderHint(QPainter::Antialiasing);

      // Fluent Colors
      QColor accentColor(0, 120, 212);      // #0078D4
      QColor inactiveColor(138, 136, 134);  // #8A8886
      QColor bgColor(255, 255, 255);        // White background
      //QColor disabledText = option.palette.color(QPalette::Disabled, QPalette::Text);
      //painter->setBrush(disabledText);
      //QColor bgColor = Qt::green;//option->palette.color(QPalette::Base);
      drawHorizontalFluentSlider(painter, slider, accentColor, inactiveColor, bgColor);
      return;
    }
  }
  QProxyStyle::drawComplexControl(control, option, painter, widget);
}


void BCSliderStyle::drawHorizontalFluentSlider(QPainter* painter, const QStyleOptionSlider* slider,
                                const QColor& activeColor, const QColor& inactiveColor,
                                const QColor& bgColor) const
{
  QRect groove = slider->rect;

  int grooveHeight = 4;
  // Track sollte im Widget-Zentrum sein, nicht im groove-Zentrum
  int grooveY = groove.center().y() - grooveHeight / 2;

  // Full background track
  QRect fullTrack(groove.left(), grooveY, groove.width(), grooveHeight);
  painter->setPen(Qt::NoPen);
  painter->setBrush(inactiveColor.lighter(150));
  painter->drawRoundedRect(fullTrack, grooveHeight / 2, grooveHeight / 2);

  QRect handle = subControlRect(CC_Slider, slider, SC_SliderHandle, nullptr);

  // Active track (filled portion)
  int activeWidth = handle.center().x() - groove.left();
  QRect activeTrack(groove.left(), grooveY, activeWidth, grooveHeight);
  painter->setBrush(activeColor);
  painter->drawRoundedRect(activeTrack, grooveHeight / 2, grooveHeight / 2);

  // Handle (Thumb) - Fluent style is more subtle
  int handleSize = 16;
  QRect thumbRect(handle.center().x() - handleSize / 2,
                  handle.center().y() - handleSize / 2,
                  handleSize, handleSize);

  // Hover effect - subtle glow
  if (slider->state & State_MouseOver)
  {
    painter->setBrush(QColor(activeColor.red(), activeColor.green(),
                             activeColor.blue(), 30));
    int glowSize = 18;
    QRect glow(handle.center().x() - glowSize / 2,
               handle.center().y() - glowSize / 2,
               glowSize, glowSize);
    painter->drawEllipse(glow);
  }

  // Thumb
  painter->setBrush(bgColor);
  painter->setPen(QPen(activeColor, 2));
  painter->drawEllipse(thumbRect);

  // Inner circle for pressed state
  if (slider->state & State_Sunken) {
    int innerSize = 6;
    QRect inner(handle.center().x() - innerSize / 2,
                handle.center().y() - innerSize / 2,
                innerSize, innerSize);
    painter->setPen(Qt::NoPen);
    painter->setBrush(activeColor);
    painter->drawEllipse(inner);
  }
}

void BCSliderStyle::drawSliderIndicator( QPainter* painter, QRect& groove )
{
  /*
  int grooveHeight = 4;
  // Track sollte im Widget-Zentrum sein, nicht im groove-Zentrum
  int grooveY = groove.center().y() - grooveHeight / 2;

  // Full background track
  QRect fullTrack(groove.left(), grooveY, groove.width(), grooveHeight);
  painter->setPen(Qt::NoPen);
  painter->setBrush(inactiveColor.lighter(150));
  painter->drawRoundedRect(fullTrack, grooveHeight / 2, grooveHeight / 2);

  QRect handle = subControlRect(CC_Slider, slider, SC_SliderHandle, nullptr);

  // Active track (filled portion)
  int activeWidth = handle.center().x() - groove.left();
  QRect activeTrack(groove.left(), grooveY, activeWidth, grooveHeight);
  painter->setBrush(activeColor);
  painter->drawRoundedRect(activeTrack, grooveHeight / 2, grooveHeight / 2);
  */
}