pentool.cpp Example File

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  #include "pentool.h"
  #include <QtWidgets/QPushButton>
  #include <QtWidgets/QDoubleSpinBox>
  #include <QtWidgets/QComboBox>
  #include <QtWidgets/QFormLayout>
  #include <QtWidgets/QColorDialog>

  PenTool::PenTool(QString title, QWidget *parent)
      : QWidget(parent)
  {
      setWindowTitle(title);
      setWindowFlags(Qt::Tool);

      m_colorButton = new QPushButton();

      m_widthSpinBox = new QDoubleSpinBox();

      m_styleCombo = new QComboBox();
      m_styleCombo->addItem("NoPen");
      m_styleCombo->addItem("SolidLine");
      m_styleCombo->addItem("DashLine");
      m_styleCombo->addItem("DotLine");
      m_styleCombo->addItem("DashDotLine");
      m_styleCombo->addItem("DashDotDotLine");

      m_capStyleCombo = new QComboBox();
      m_capStyleCombo->addItem("FlatCap", Qt::FlatCap);
      m_capStyleCombo->addItem("SquareCap", Qt::SquareCap);
      m_capStyleCombo->addItem("RoundCap", Qt::RoundCap);

      m_joinStyleCombo = new QComboBox();
      m_joinStyleCombo->addItem("MiterJoin", Qt::MiterJoin);
      m_joinStyleCombo->addItem("BevelJoin", Qt::BevelJoin);
      m_joinStyleCombo->addItem("RoundJoin", Qt::RoundJoin);
      m_joinStyleCombo->addItem("SvgMiterJoin", Qt::SvgMiterJoin);

      QFormLayout *layout = new QFormLayout();
      layout->addRow("Color", m_colorButton);
      layout->addRow("Width", m_widthSpinBox);
      layout->addRow("Style", m_styleCombo);
      layout->addRow("Cap style", m_capStyleCombo);
      layout->addRow("Join style", m_joinStyleCombo);
      setLayout(layout);

      connect(m_colorButton, SIGNAL(clicked()), this, SLOT(showColorDialog()));
      connect(m_widthSpinBox, SIGNAL(valueChanged(double)), this, SLOT(updateWidth(double)));
      connect(m_styleCombo, SIGNAL(currentIndexChanged(int)), this, SLOT(updateStyle(int)));
      connect(m_capStyleCombo, SIGNAL(currentIndexChanged(int)), this, SLOT(updateCapStyle(int)));
      connect(m_joinStyleCombo, SIGNAL(currentIndexChanged(int)), this, SLOT(updateJoinStyle(int)));
  }

  void PenTool::setPen(const QPen &pen)
  {
      m_pen = pen;
      m_colorButton->setText(m_pen.color().name());
      m_widthSpinBox->setValue(m_pen.widthF());
      m_styleCombo->setCurrentIndex(m_pen.style()); // index matches the enum
      m_capStyleCombo->setCurrentIndex(m_capStyleCombo->findData(m_pen.capStyle()));
      m_joinStyleCombo->setCurrentIndex(m_joinStyleCombo->findData(m_pen.joinStyle()));
  }

  QPen PenTool::pen() const
  {
      return m_pen;
  }

  QString PenTool::name()
  {
      return name(m_pen);
  }

  QString PenTool::name(const QPen &pen)
  {
      return pen.color().name() + ":" + QString::number(pen.widthF());
  }

  void PenTool::showColorDialog()
  {
      QColorDialog dialog(m_pen.color());
      dialog.show();
      dialog.exec();
      m_pen.setColor(dialog.selectedColor());
      m_colorButton->setText(m_pen.color().name());
      emit changed();
  }

  void PenTool::updateWidth(double width)
  {
      if (!qFuzzyCompare((qreal) width, m_pen.widthF())) {
          m_pen.setWidthF(width);
          emit changed();
      }
  }

  void PenTool::updateStyle(int style)
  {
      if (m_pen.style() != style) {
          m_pen.setStyle((Qt::PenStyle) style);
          emit changed();
      }
  }

  void PenTool::updateCapStyle(int index)
  {
      Qt::PenCapStyle capStyle = (Qt::PenCapStyle) m_capStyleCombo->itemData(index).toInt();
      if (m_pen.capStyle() != capStyle) {
          m_pen.setCapStyle(capStyle);
          emit changed();
      }
  }

  void PenTool::updateJoinStyle(int index)
  {
      Qt::PenJoinStyle joinStyle = (Qt::PenJoinStyle) m_joinStyleCombo->itemData(index).toInt();
      if (m_pen.joinStyle() != joinStyle) {
          m_pen.setJoinStyle(joinStyle);
          emit changed();
      }
  }

  #include "moc_pentool.cpp"