Qt 5.9 | Qt Charts | Pie Chart Customization Example | pentool.cpp Example File

Qt 5.9.9 Reference Documentation

# pentool.cpp Example File

piechartcustomization/pentool.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the Qt Charts module of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:GPL$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
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      ** information use the contact form at https://www.qt.io/contact-us.
      **
      ** GNU General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU
      ** General Public License version 3 or (at your option) any later version
      ** approved by the KDE Free Qt Foundation. The licenses are as published by
      ** the Free Software Foundation and appearing in the file LICENSE.GPL3
      ** included in the packaging of this file. Please review the following
      ** information to ensure the GNU General Public License requirements will
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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);

          // Use old style connect on some signals because the signal is overloaded
          connect(m_colorButton, &QPushButton::clicked, this, &PenTool::showColorDialog);
          connect(m_widthSpinBox,
                  static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
                  this, &PenTool::updateWidth);
          connect(m_styleCombo,
                  static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
                  this, &PenTool::updateStyle);
          connect(m_capStyleCombo,
                  static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
                  this, &PenTool::updateCapStyle);
          connect(m_joinStyleCombo,
                  static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
                  this, &PenTool::updateJoinStyle);
      }

      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"