mainwidget.cpp Example File

piechartcustomization/mainwidget.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
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** 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
 ** be met: https://www.gnu.org/licenses/gpl-3.0.html.
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
 #include "mainwidget.h"
 #include "customslice.h"
 #include "pentool.h"
 #include "brushtool.h"
 #include <QtWidgets/QPushButton>
 #include <QtWidgets/QComboBox>
 #include <QtWidgets/QCheckBox>
 #include <QtWidgets/QLineEdit>
 #include <QtWidgets/QGroupBox>
 #include <QtWidgets/QDoubleSpinBox>
 #include <QtWidgets/QFormLayout>
 #include <QtWidgets/QFontDialog>
 #include <QtCharts/QChartView>
 #include <QtCharts/QPieSeries>

 QT_CHARTS_USE_NAMESPACE

 MainWidget::MainWidget(QWidget *parent)
     : QWidget(parent),
       m_slice(0)
 {
     // create chart
     QChart *chart = new QChart;
     chart->setTitle("Piechart customization");
     chart->setAnimationOptions(QChart::AllAnimations);

     // create series
     m_series = new QPieSeries();
     *m_series << new CustomSlice("Slice 1", 10.0);
     *m_series << new CustomSlice("Slice 2", 20.0);
     *m_series << new CustomSlice("Slice 3", 30.0);
     *m_series << new CustomSlice("Slice 4", 40.0);
     *m_series << new CustomSlice("Slice 5", 50.0);
     m_series->setLabelsVisible();
     chart->addSeries(m_series);

     connect(m_series, &QPieSeries::clicked, this, &MainWidget::handleSliceClicked);

     // chart settings
     m_themeComboBox = new QComboBox();
     m_themeComboBox->addItem("Light", QChart::ChartThemeLight);
     m_themeComboBox->addItem("BlueCerulean", QChart::ChartThemeBlueCerulean);
     m_themeComboBox->addItem("Dark", QChart::ChartThemeDark);
     m_themeComboBox->addItem("BrownSand", QChart::ChartThemeBrownSand);
     m_themeComboBox->addItem("BlueNcs", QChart::ChartThemeBlueNcs);
     m_themeComboBox->addItem("High Contrast", QChart::ChartThemeHighContrast);
     m_themeComboBox->addItem("Blue Icy", QChart::ChartThemeBlueIcy);
     m_themeComboBox->addItem("Qt", QChart::ChartThemeQt);

     m_aaCheckBox = new QCheckBox();
     m_animationsCheckBox = new QCheckBox();
     m_animationsCheckBox->setCheckState(Qt::Checked);

     m_legendCheckBox = new QCheckBox();

     QFormLayout *chartSettingsLayout = new QFormLayout();
     chartSettingsLayout->addRow("Theme", m_themeComboBox);
     chartSettingsLayout->addRow("Antialiasing", m_aaCheckBox);
     chartSettingsLayout->addRow("Animations", m_animationsCheckBox);
     chartSettingsLayout->addRow("Legend", m_legendCheckBox);
     QGroupBox *chartSettings = new QGroupBox("Chart");
     chartSettings->setLayout(chartSettingsLayout);

     connect(m_themeComboBox, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
             this, &MainWidget::updateChartSettings);
     connect(m_aaCheckBox, &QCheckBox::toggled, this, &MainWidget::updateChartSettings);
     connect(m_animationsCheckBox, &QCheckBox::toggled, this, &MainWidget::updateChartSettings);
     connect(m_legendCheckBox, &QCheckBox::toggled, this, &MainWidget::updateChartSettings);

     // series settings
     m_hPosition = new QDoubleSpinBox();
     m_hPosition->setMinimum(0.0);
     m_hPosition->setMaximum(1.0);
     m_hPosition->setSingleStep(0.1);
     m_hPosition->setValue(m_series->horizontalPosition());

     m_vPosition = new QDoubleSpinBox();
     m_vPosition->setMinimum(0.0);
     m_vPosition->setMaximum(1.0);
     m_vPosition->setSingleStep(0.1);
     m_vPosition->setValue(m_series->verticalPosition());

     m_sizeFactor = new QDoubleSpinBox();
     m_sizeFactor->setMinimum(0.0);
     m_sizeFactor->setMaximum(1.0);
     m_sizeFactor->setSingleStep(0.1);
     m_sizeFactor->setValue(m_series->pieSize());

     m_startAngle = new QDoubleSpinBox();
     m_startAngle->setMinimum(-720);
     m_startAngle->setMaximum(720);
     m_startAngle->setValue(m_series->pieStartAngle());
     m_startAngle->setSingleStep(1);

     m_endAngle = new QDoubleSpinBox();
     m_endAngle->setMinimum(-720);
     m_endAngle->setMaximum(720);
     m_endAngle->setValue(m_series->pieEndAngle());
     m_endAngle->setSingleStep(1);

     m_holeSize = new QDoubleSpinBox();
     m_holeSize->setMinimum(0.0);
     m_holeSize->setMaximum(1.0);
     m_holeSize->setSingleStep(0.1);
     m_holeSize->setValue(m_series->holeSize());

     QPushButton *appendSlice = new QPushButton("Append slice");
     QPushButton *insertSlice = new QPushButton("Insert slice");
     QPushButton *removeSlice = new QPushButton("Remove selected slice");

     QFormLayout *seriesSettingsLayout = new QFormLayout();
     seriesSettingsLayout->addRow("Horizontal position", m_hPosition);
     seriesSettingsLayout->addRow("Vertical position", m_vPosition);
     seriesSettingsLayout->addRow("Size factor", m_sizeFactor);
     seriesSettingsLayout->addRow("Start angle", m_startAngle);
     seriesSettingsLayout->addRow("End angle", m_endAngle);
     seriesSettingsLayout->addRow("Hole size", m_holeSize);
     seriesSettingsLayout->addRow(appendSlice);
     seriesSettingsLayout->addRow(insertSlice);
     seriesSettingsLayout->addRow(removeSlice);
     QGroupBox *seriesSettings = new QGroupBox("Series");
     seriesSettings->setLayout(seriesSettingsLayout);

     connect(m_vPosition,
             static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
             this, &MainWidget::updateSerieSettings);
     connect(m_hPosition,
             static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
             this, &MainWidget::updateSerieSettings);
     connect(m_sizeFactor,
             static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
             this, &MainWidget::updateSerieSettings);
     connect(m_startAngle,
             static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
             this, &MainWidget::updateSerieSettings);
     connect(m_endAngle,
             static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
             this, &MainWidget::updateSerieSettings);
     connect(m_holeSize,
             static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
             this, &MainWidget::updateSerieSettings);
     connect(appendSlice, &QPushButton::clicked, this, &MainWidget::appendSlice);
     connect(insertSlice, &QPushButton::clicked, this, &MainWidget::insertSlice);
     connect(removeSlice, &QPushButton::clicked, this, &MainWidget::removeSlice);

     // slice settings
     m_sliceName = new QLineEdit("<click a slice>");
     m_sliceName->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Maximum);
     m_sliceValue = new QDoubleSpinBox();
     m_sliceValue->setMaximum(1000);
     m_sliceLabelVisible = new QCheckBox();
     m_sliceLabelArmFactor = new QDoubleSpinBox();
     m_sliceLabelArmFactor->setSingleStep(0.01);
     m_sliceExploded = new QCheckBox();
     m_sliceExplodedFactor = new QDoubleSpinBox();
     m_sliceExplodedFactor->setSingleStep(0.01);
     m_pen = new QPushButton();
     m_penTool = new PenTool("Slice pen", this);
     m_brush = new QPushButton();
     m_brushTool = new BrushTool("Slice brush", this);
     m_font = new QPushButton();
     m_labelBrush = new QPushButton();
     m_labelBrushTool = new BrushTool("Label brush", this);
     m_labelPosition = new QComboBox(this);
     m_labelPosition->addItem("Outside", QPieSlice::LabelOutside);
     m_labelPosition->addItem("Inside horizontal", QPieSlice::LabelInsideHorizontal);
     m_labelPosition->addItem("Inside tangential", QPieSlice::LabelInsideTangential);
     m_labelPosition->addItem("Inside normal", QPieSlice::LabelInsideNormal);

     QFormLayout *sliceSettingsLayout = new QFormLayout();
     sliceSettingsLayout->addRow("Label", m_sliceName);
     sliceSettingsLayout->addRow("Value", m_sliceValue);
     sliceSettingsLayout->addRow("Pen", m_pen);
     sliceSettingsLayout->addRow("Brush", m_brush);
     sliceSettingsLayout->addRow("Label visible", m_sliceLabelVisible);
     sliceSettingsLayout->addRow("Label font", m_font);
     sliceSettingsLayout->addRow("Label brush", m_labelBrush);
     sliceSettingsLayout->addRow("Label position", m_labelPosition);
     sliceSettingsLayout->addRow("Label arm length", m_sliceLabelArmFactor);
     sliceSettingsLayout->addRow("Exploded", m_sliceExploded);
     sliceSettingsLayout->addRow("Explode distance", m_sliceExplodedFactor);
     QGroupBox *sliceSettings = new QGroupBox("Selected slice");
     sliceSettings->setLayout(sliceSettingsLayout);

     connect(m_sliceName, &QLineEdit::textChanged, this, &MainWidget::updateSliceSettings);
     connect(m_sliceValue,
             static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
             this, &MainWidget::updateSliceSettings);
     connect(m_pen, &QPushButton::clicked, m_penTool, &PenTool::show);
     connect(m_penTool, &PenTool::changed, this, &MainWidget::updateSliceSettings);
     connect(m_brush, &QPushButton::clicked, m_brushTool, &BrushTool::show);
     connect(m_brushTool, &BrushTool::changed, this, &MainWidget::updateSliceSettings);
     connect(m_font, &QPushButton::clicked, this, &MainWidget::showFontDialog);
     connect(m_labelBrush, &QPushButton::clicked, m_labelBrushTool, &BrushTool::show);
     connect(m_labelBrushTool, &BrushTool::changed, this, &MainWidget::updateSliceSettings);
     connect(m_sliceLabelVisible, &QCheckBox::toggled, this, &MainWidget::updateSliceSettings);
     connect(m_sliceLabelVisible, &QCheckBox::toggled, this, &MainWidget::updateSliceSettings);
     connect(m_sliceLabelArmFactor,
             static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
             this, &MainWidget::updateSliceSettings);
     connect(m_sliceExploded, &QCheckBox::toggled, this, &MainWidget::updateSliceSettings);
     connect(m_sliceExplodedFactor,
             static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
             this, &MainWidget::updateSliceSettings);
     connect(m_labelPosition,
             static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
             this, &MainWidget::updateSliceSettings);

     // create chart view
     m_chartView = new QChartView(chart);

     // create main layout
     QVBoxLayout *settingsLayout = new QVBoxLayout();
     settingsLayout->addWidget(chartSettings);
     settingsLayout->addWidget(seriesSettings);
     settingsLayout->addWidget(sliceSettings);
     settingsLayout->addStretch();

     QGridLayout *baseLayout = new QGridLayout();
     baseLayout->addLayout(settingsLayout, 0, 0);
     baseLayout->addWidget(m_chartView, 0, 1);
     setLayout(baseLayout);

     updateSerieSettings();
     updateChartSettings();
 }

 void MainWidget::updateChartSettings()
 {
     QChart::ChartTheme theme = static_cast<QChart::ChartTheme>(m_themeComboBox->itemData(
                 m_themeComboBox->currentIndex()).toInt());
     m_chartView->chart()->setTheme(theme);
     m_chartView->setRenderHint(QPainter::Antialiasing, m_aaCheckBox->isChecked());

     if (m_animationsCheckBox->checkState() == Qt::Checked)
         m_chartView->chart()->setAnimationOptions(QChart::AllAnimations);
     else
         m_chartView->chart()->setAnimationOptions(QChart::NoAnimation);

     if (m_legendCheckBox->checkState() == Qt::Checked)
         m_chartView->chart()->legend()->show();
     else
         m_chartView->chart()->legend()->hide();
 }

 void MainWidget::updateSerieSettings()
 {
     m_series->setHorizontalPosition(m_hPosition->value());
     m_series->setVerticalPosition(m_vPosition->value());
     m_series->setPieSize(m_sizeFactor->value());
     m_holeSize->setMaximum(m_sizeFactor->value());
     m_series->setPieStartAngle(m_startAngle->value());
     m_series->setPieEndAngle(m_endAngle->value());
     m_series->setHoleSize(m_holeSize->value());
 }

 void MainWidget::updateSliceSettings()
 {
     if (!m_slice)
         return;

     m_slice->setLabel(m_sliceName->text());

     m_slice->setValue(m_sliceValue->value());

     m_slice->setPen(m_penTool->pen());
     m_slice->setBrush(m_brushTool->brush());

     m_slice->setLabelBrush(m_labelBrushTool->brush());
     m_slice->setLabelVisible(m_sliceLabelVisible->isChecked());
     m_slice->setLabelArmLengthFactor(m_sliceLabelArmFactor->value());
     // We assume that label position index is in sync with the enum
     m_slice->setLabelPosition((QPieSlice::LabelPosition)m_labelPosition->currentIndex());

     m_slice->setExploded(m_sliceExploded->isChecked());
     m_slice->setExplodeDistanceFactor(m_sliceExplodedFactor->value());
 }

 void MainWidget::handleSliceClicked(QPieSlice *slice)
 {
     m_slice = static_cast<CustomSlice *>(slice);

     // name
     m_sliceName->blockSignals(true);
     m_sliceName->setText(slice->label());
     m_sliceName->blockSignals(false);

     // value
     m_sliceValue->blockSignals(true);
     m_sliceValue->setValue(slice->value());
     m_sliceValue->blockSignals(false);

     // pen
     m_pen->setText(PenTool::name(m_slice->pen()));
     m_penTool->setPen(m_slice->pen());

     // brush
     m_brush->setText(m_slice->originalBrush().color().name());
     m_brushTool->setBrush(m_slice->originalBrush());

     // label
     m_labelBrush->setText(BrushTool::name(m_slice->labelBrush()));
     m_labelBrushTool->setBrush(m_slice->labelBrush());
     m_font->setText(slice->labelFont().toString());
     m_sliceLabelVisible->blockSignals(true);
     m_sliceLabelVisible->setChecked(slice->isLabelVisible());
     m_sliceLabelVisible->blockSignals(false);
     m_sliceLabelArmFactor->blockSignals(true);
     m_sliceLabelArmFactor->setValue(slice->labelArmLengthFactor());
     m_sliceLabelArmFactor->blockSignals(false);
     m_labelPosition->blockSignals(true);
     // We assume that label position index is in sync with the enum
     m_labelPosition->setCurrentIndex(slice->labelPosition());
     m_labelPosition->blockSignals(false);

     // exploded
     m_sliceExploded->blockSignals(true);
     m_sliceExploded->setChecked(slice->isExploded());
     m_sliceExploded->blockSignals(false);
     m_sliceExplodedFactor->blockSignals(true);
     m_sliceExplodedFactor->setValue(slice->explodeDistanceFactor());
     m_sliceExplodedFactor->blockSignals(false);
 }

 void MainWidget::showFontDialog()
 {
     if (!m_slice)
         return;

     QFontDialog dialog(m_slice->labelFont());
     dialog.show();
     dialog.exec();

     m_slice->setLabelFont(dialog.currentFont());
     m_font->setText(dialog.currentFont().toString());
 }

 void MainWidget::appendSlice()
 {
     *m_series << new CustomSlice("Slice " + QString::number(m_series->count() + 1), 10.0);
 }

 void MainWidget::insertSlice()
 {
     if (!m_slice)
         return;

     int i = m_series->slices().indexOf(m_slice);

     m_series->insert(i, new CustomSlice("Slice " + QString::number(m_series->count() + 1), 10.0));
 }

 void MainWidget::removeSlice()
 {
     if (!m_slice)
         return;

     m_sliceName->setText("<click a slice>");

     m_series->remove(m_slice);
     m_slice = 0;
 }

 #include "moc_mainwidget.cpp"