qt-migration-legatus/qt5-before/dlbo/Lts/Common/LtsWidgets/lts_led_widget.cpp

/**
  * @RDE_HEADER@
  * Class of Led Widget
  * $Id$
  * $HeadURL$
  * $Author$
  */

#include "lts_led_widget.h"
#include <QPainter>
#include <QPropertyAnimation>
#include <QResizeEvent>
namespace LtsWidgets
{

void LtsLedWidget::resizeEvent(QResizeEvent *event)
{
  switch (m_aspectHint) {
  case AspectHint::NoHint:
  {
    // NOTE: the next 4 lines would overwrite set properties from ui files
//    setMinimumWidth(0);
//    setMaximumWidth(65000);
//    setMinimumHeight(0);
//    setMaximumHeight(65000);
    QWidget::resizeEvent(event);
    break;
  }
  case AspectHint::HeightIsWidth:
    setMinimumHeight(event->size().width());
    setMaximumHeight(event->size().width());
    setMinimumWidth(0);
    setMaximumWidth(65000);
    break;
  case AspectHint::WidthIsHeight:
    setMinimumHeight(0);
    setMaximumHeight(65000);
    setMinimumWidth(event->size().height());
    setMaximumWidth(event->size().height());
    break;
  }
}

/**
  * The following values were determined by trial and error:
  */
static constexpr double GRADIENT_KEY_LOWER         =   0.3;
static constexpr double GRADIENT_KEY_UPPER         =   0.9;
static constexpr int    GRADIENT_VALUE_LOWER       = 125;
static constexpr int    GRADIENT_VALUE_UPPER       = 165;
static constexpr double GRADIENT_CENTER_OFFSET     =   5.0;
static constexpr double GRADIENT_FOCALPOINT_OFFSET =   2.7;
static constexpr double PERCENTAGE_OF_BORDER       =   0.1;
static constexpr int    DARK_FACTOR                = 200;

LtsLedWidget::LtsLedWidget(QWidget *parent, const QColor &oncolor, const QColor &offcolor, bool useGradient, int animtime)
  : QWidget(parent)
  , m_status(true)
  , m_oncolor(oncolor)
  , m_offcolor(offcolor)
  , m_currentcolor(oncolor)
  , m_gradient(useGradient)
  , m_animTime(animtime)
{
  setObjectName(QString::fromUtf8("LtsLedWidget"));
}

void LtsLedWidget::paintEvent(QPaintEvent *pe)
{
  Q_UNUSED(pe);
  QPainter p;
  p.begin(this);
  p.setOpacity(QWidget::isEnabled() ? 1.00 : 0.5);

  int minSize = height() > width() ? width() : height();
  if (m_gradient)
  {
    QRadialGradient grad(QPointF(width(), height()) / GRADIENT_CENTER_OFFSET,       // Center
                         minSize,                                                   // Radius
                         QPointF(width(), height()) / GRADIENT_FOCALPOINT_OFFSET);  // FocalPoint
    grad.setColorAt(GRADIENT_KEY_LOWER, m_currentcolor.lighter(GRADIENT_VALUE_LOWER));
    grad.setColorAt(GRADIENT_KEY_UPPER, m_currentcolor.darker(GRADIENT_VALUE_UPPER));
    p.setBrush(grad);
  }
  else
    p.setBrush(QBrush(m_currentcolor, Qt::SolidPattern));

  p.setRenderHint(QPainter::Antialiasing);
  p.setPen(QPen(Qt::black, PERCENTAGE_OF_BORDER * minSize, Qt::SolidLine, Qt::SquareCap));
  p.drawEllipse(QPointF(width(), height()) / 2.0,
                width()  / (2.0 * (1.00 + PERCENTAGE_OF_BORDER)),
                height() / (2.0 * (1.00 + PERCENTAGE_OF_BORDER)));
  p.end();
}

void LtsLedWidget::animate()
{
  QPropertyAnimation *anim = new QPropertyAnimation(this, "currentcolor");
  anim->setDuration(m_animTime);
  anim->setEasingCurve(QEasingCurve::OutBack);
  anim->setStartValue(m_currentcolor);
  anim->setEndValue(m_status ? m_oncolor : m_offcolor == Qt::black ? m_oncolor.darker(DARK_FACTOR) : m_offcolor);
  anim->start(QPropertyAnimation::DeleteWhenStopped);
}

void LtsLedWidget::setStatus(bool status)
{
  if (m_status == status)
    return;
  m_status = status;
  animate();
}

void LtsLedWidget::setUseGradient(bool useGradient)
{
  if (m_gradient == useGradient)
    return;
  m_gradient = useGradient;
  repaint();
}

void LtsLedWidget::setColor(const QColor &oncolor, const QColor &offcolor)
{
  setOnColor(oncolor);
  setOffColor(offcolor);
}

void LtsLedWidget::setOnColor(const QColor &oncolor)
{
  if (m_oncolor == oncolor)
    return;
  m_oncolor = oncolor;
  if (m_status)
    animate();
}

void LtsLedWidget::setOffColor(const QColor &offcolor)
{
  if (m_offcolor == offcolor)
    return;
  m_offcolor = offcolor;
  if (!m_status)
    animate();
}

void LtsLedWidget::setCurrentColor(const QColor &currentcolor)
{
  if (m_currentcolor == currentcolor)
    return;
  m_currentcolor = currentcolor;
  repaint();
}

} // namespace namespace LtsWidgets