#include "slider.h"
  
  #include <QMouseEvent>
  #include <QPainter>
  #include <QDebug>
  
  Slider::Slider(QWidget *parent) : QWidget(parent),

      isSliderDown_(false),
      sliderPosition_(0), value_(0), minimum_(0), maximum_(1),
      subVisible_(true),

      focused(false), isSliderMoved_(false),

      tickInterval(0), bigTickInterval(0)

  {
      groove.load(":/images/slider/groove.png");
      sub.load(":/images/slider/humidity.png");
      handle.load(":/images/slider/handle_big.png");
      updatePixmapPosition();

  }
  
  void Slider::setSubPixmap(const QPixmap &pixmap)
  {
      sub = pixmap;
  }
  
  void Slider::setSubPixmap(const QString &fileName)
  {
      setSubPixmap(QPixmap(fileName));
  }

  void Slider::setSubVisible(bool visible)
  {
      if (subVisible_ == visible)
          return;
  
      subVisible_ = visible;
  
      update();
  }

  void Slider::setRange(int min, int max)
  {

      if (minimum_ == min && maximum_ == max)
          return;

      minimum_ = min;
      maximum_ = max;
  
      if (value_ < min)
          setValue(min);
      else if (value_ > max)
          setValue(max);

  
      update();

  }
  
  void Slider::setMinimum(int min)
  {

      if (minimum_ == min)
          return;

      minimum_ = min;
  
      if (value_ < min)
          setValue(min);

  
      update();

  }
  
  void Slider::setMaximum(int max)
  {

      if (maximum_ == max)
          return;

      maximum_ = max;
  
      if (value_ > max)
          setValue(max);

  
      update();
  }
  
  int Slider::value()
  {
      return value_;

  }
  
  bool Slider::isSliderDown()
  {
      return isSliderDown_;
  }
  
  int Slider::sliderPosition()
  {
      return sliderPosition_;
  }
  
  void Slider::setSliderPosition(int value)
  {

      value = qBound(minimum_, value, maximum_);

      if (sliderPosition_ == value)
          return;
  
      sliderPosition_ = value;

      if (focused)
          isSliderMoved_ = true;

  
      emit sliderMoved(value);
  
      update();
  }

  bool Slider::isSliderMoved()
  {
      return isSliderMoved_;
  }
  
  void Slider::focusInEvent(QFocusEvent */*event*/)
  {
      focused = true;
  }
  
  void Slider::focusOutEvent(QFocusEvent *event)
  {
      QWidget::focusOutEvent(event);
  
      focused = false;
  
      if (isSliderMoved_)
      {
          isSliderMoved_ = false;
          value_ = sliderPosition_;
          emit valueChanged(value_);
      }
  }
  
  void Slider::keyPressEvent(QKeyEvent *event)
  {
      switch (event->key())
      {

      case 0x01000032:    // Turn left

          decrease();
          break;
      case 0x01000031:    // Push
          event->ignore();
          break;

      case 0x01000030:    // Turn right

          increase();
          break;
      }
  }
  
  void Slider::keyReleaseEvent(QKeyEvent *event)
  {
      switch (event->key())
      {

      case 0x01000032:    // Turn left

          decrease();
          break;
      case 0x01000031:    // Push
          event->ignore();
          break;

      case 0x01000030:    // Turn right

          increase();
          break;
      }
  }

  void Slider::mouseMoveEvent(QMouseEvent *event)
  {
      if (!isSliderDown_)
          return;
  
      setSliderPosition(calcSliderPosition(event->x()));
  }

  void Slider::mousePressEvent(QMouseEvent *event)

  {
      isSliderDown_ = true;

  
      emit sliderPressed();

  
      setSliderPosition(calcSliderPosition(event->x()));

  }
  
  void Slider::mouseReleaseEvent(QMouseEvent */*event*/)
  {
      isSliderDown_ = false;

      emit sliderReleased();

  }
  
  void Slider::paintEvent(QPaintEvent */*event*/)
  {
      QPainter painter(this);

      painter.drawPixmap(grooveLeftTop, groove);

      QPen tickPen(QColor(71, 71, 71));
      tickPen.setWidth(2);
      painter.setPen(tickPen);

      if (tickInterval)
          for (int tick = minimum_; tick <= maximum_; tick += tickInterval)
          {

              int x = subLeftTop.x() + calcSubLength(tick);

              painter.drawLine(x, grooveLeftTop.y() + 26, x, grooveLeftTop.y() + 33);

          }
      else
          foreach (int tick, ticks)
          {

              int x = subLeftTop.x() + calcSubLength(tick);

              painter.drawLine(x, grooveLeftTop.y() + 26, x, grooveLeftTop.y() + 33);

          }
  
      if (bigTickInterval)
          for (int tick = minimum_; tick <= maximum_; tick += bigTickInterval)
          {

              int x = subLeftTop.x() + calcSubLength(tick);

              painter.drawLine(x, grooveLeftTop.y() + 26, x, grooveLeftTop.y() + 39);

          }
      else
          foreach (int tick, bigTicks)
          {

              int x = subLeftTop.x() + calcSubLength(tick);

              painter.drawLine(x, grooveLeftTop.y() + 26, x, grooveLeftTop.y() + 39);

          }
  
      if (subVisible_)

      {

          int subLength = calcSubLength(sliderPosition_);
          if (subLength > 0)

              painter.drawPixmap(subLeftTop, sub, QRect(0, 0, subLength, sub.height()));

          QPoint handlePoint(subLeftTop.x() + subLength - handle.width() / 2, (height() - handle.height()) / 2);

          painter.drawPixmap(handlePoint, handle);
      }

  }
  
  void Slider::resizeEvent(QResizeEvent */*event*/)
  {
      updatePixmapPosition();
  }
  
  int Slider::calcSliderPosition(int mouseX)
  {

      int x = qBound(minSliderX, mouseX, maxSliderX);
      qreal pos = (qreal) (x - minSliderX) / (maxSliderX - minSliderX) * (maximum_ - minimum_) + minimum_;

      return qRound(pos);
  }
  
  int Slider::calcSubLength(int value)
  {
      return handle.width() / 4 + (sub.width() - handle.width() / 2) * (value - minimum_) / (maximum_ - minimum_);
  }
  
  void Slider::updatePixmapPosition()
  {

      minSliderX = (width() - sub.width()) / 2;
      maxSliderX = width() - minSliderX;

      grooveLeftTop = QPoint((width() - groove.width()) / 2, (height() - groove.height()) / 2);
      subLeftTop = QPoint((width() - sub.width()) / 2, (height() - sub.height()) / 2);

  }
  
  void Slider::setValue(int value)
  {

      value = qBound(minimum_, value, maximum_);

  
      setSliderPosition(value);

      if (value == value_)
          return;

      value_ = value;
  
      emit valueChanged(value);
  }

  
  void Slider::increase()
  {
      setSliderPosition(sliderPosition_ + 1);
  }
  
  void Slider::decrease()
  {
      setSliderPosition(sliderPosition_ - 1);
  }