/**************************************************************************** ** ** Copyright (C) 2021 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the Qt Charts module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:COMM$ ** ** 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. ** ** $QT_END_LICENSE$ ** ** ** ** ** ** ** ** ** ****************************************************************************/ #include #include #include #include #include /*! \enum QChartView::RubberBand This enum describes the different types of rubber band effects that can be applied to the rectangular zooming area. \value NoRubberBand No zooming area is specified, and therefore zooming is not enabled. \value VerticalRubberBand The rubber band is locked to the size of the chart horizontally and can be pulled vertically to specify the zooming area. \value HorizontalRubberBand The rubber band is locked to the size of the chart vertically and can be pulled horizontally to specify the zooming area. \value RectangleRubberBand The rubber band is fixed to the point that was clicked and can be pulled both vertically and horizontally. */ /*! \class QChartView \inmodule QtCharts \brief The QChartView is a standalone widget that can display charts. A chart view does not require a QGraphicsScene object to work. To display a chart in an existing QGraphicsScene, the QChart or QPolarChart class should be used instead. \sa QChart, QPolarChart */ QT_CHARTS_BEGIN_NAMESPACE /*! Constructs a chart view object with the parent \a parent. */ QChartView::QChartView(QWidget *parent) : QGraphicsView(parent), d_ptr(new QChartViewPrivate(this)) { } /*! Constructs a chart view object with the parent \a parent to display the chart \a chart. The ownership of the chart is passed to the chart view. */ QChartView::QChartView(QChart *chart, QWidget *parent) : QGraphicsView(parent), d_ptr(new QChartViewPrivate(this, chart)) { } /*! Deletes the chart view object and the associated chart. */ QChartView::~QChartView() { } /*! Returns the pointer to the associated chart. */ QChart *QChartView::chart() const { return d_ptr->m_chart; } /*! Sets the current chart to \a chart. The ownership of the new chart is passed to the chart view and the ownership of the previous chart is released. To avoid memory leaks, the previous chart must be deleted. */ void QChartView::setChart(QChart *chart) { d_ptr->setChart(chart); } /*! Sets the rubber band flags to \a rubberBand. The selected flags determine the way zooming is performed. \note Rubber band zooming is not supported for polar charts. */ void QChartView::setRubberBand(const RubberBands &rubberBand) { #ifndef QT_NO_RUBBERBAND d_ptr->m_rubberBandFlags = rubberBand; if (!d_ptr->m_rubberBandFlags) { delete d_ptr->m_rubberBand; d_ptr->m_rubberBand = nullptr; return; } if (!d_ptr->m_rubberBand) { d_ptr->m_rubberBand = new QRubberBand(QRubberBand::Rectangle, this); d_ptr->m_rubberBand->setEnabled(true); } #else Q_UNUSED(rubberBand); qWarning("Unable to set rubber band because Qt is configured without it."); #endif } /*! Returns the rubber band flags that are currently being used by the chart view. */ QChartView::RubberBands QChartView::rubberBand() const { return d_ptr->m_rubberBandFlags; } /*! If the left mouse button is pressed and the rubber band is enabled, the event \a event is accepted and the rubber band is displayed on the screen. This enables the user to select the zoom area. If some other mouse button is pressed or the rubber band is disabled, the event is passed to QGraphicsView::mousePressEvent(). */ void QChartView::mousePressEvent(QMouseEvent *event) { #ifndef QT_NO_RUBBERBAND QRectF plotArea = d_ptr->m_chart->plotArea(); if (d_ptr->m_rubberBand && d_ptr->m_rubberBand->isEnabled() && event->button() == Qt::LeftButton && plotArea.contains(event->pos())) { d_ptr->m_rubberBandOrigin = event->pos(); d_ptr->m_rubberBand->setGeometry(QRect(d_ptr->m_rubberBandOrigin, QSize())); d_ptr->m_rubberBand->show(); event->accept(); } else { #endif QGraphicsView::mousePressEvent(event); #ifndef QT_NO_RUBBERBAND } #endif } /*! If the rubber band rectangle is displayed in the press event specified by \a event, the event data is used to update the rubber band geometry. Otherwise, the default QGraphicsView::mouseMoveEvent() implementation is called. */ void QChartView::mouseMoveEvent(QMouseEvent *event) { #ifndef QT_NO_RUBBERBAND if (d_ptr->m_rubberBand && d_ptr->m_rubberBand->isVisible()) { QRect rect = d_ptr->m_chart->plotArea().toRect(); int width = event->pos().x() - d_ptr->m_rubberBandOrigin.x(); int height = event->pos().y() - d_ptr->m_rubberBandOrigin.y(); if (!d_ptr->m_rubberBandFlags.testFlag(VerticalRubberBand)) { d_ptr->m_rubberBandOrigin.setY(rect.top()); height = rect.height(); } if (!d_ptr->m_rubberBandFlags.testFlag(HorizontalRubberBand)) { d_ptr->m_rubberBandOrigin.setX(rect.left()); width = rect.width(); } d_ptr->m_rubberBand->setGeometry(QRect(d_ptr->m_rubberBandOrigin.x(), d_ptr->m_rubberBandOrigin.y(), width, height).normalized()); } else { #endif QGraphicsView::mouseMoveEvent(event); #ifndef QT_NO_RUBBERBAND } #endif } /*! If the left mouse button is released and the rubber band is enabled, the event \a event is accepted and the view is zoomed into the rectangle specified by the rubber band. If releasing the right mouse button triggered the event, the view is zoomed out. */ void QChartView::mouseReleaseEvent(QMouseEvent *event) { #ifndef QT_NO_RUBBERBAND if (d_ptr->m_rubberBand && d_ptr->m_rubberBand->isVisible()) { if (event->button() == Qt::LeftButton) { d_ptr->m_rubberBand->hide(); QRectF rect = d_ptr->m_rubberBand->geometry(); // Since plotArea uses QRectF and rubberband uses QRect, we can't just blindly use // rubberband's dimensions for vertical and horizontal rubberbands, where one // dimension must match the corresponding plotArea dimension exactly. if (d_ptr->m_rubberBandFlags == VerticalRubberBand) { rect.setX(d_ptr->m_chart->plotArea().x()); rect.setWidth(d_ptr->m_chart->plotArea().width()); } else if (d_ptr->m_rubberBandFlags == HorizontalRubberBand) { rect.setY(d_ptr->m_chart->plotArea().y()); rect.setHeight(d_ptr->m_chart->plotArea().height()); } d_ptr->m_chart->zoomIn(rect); event->accept(); } } else if (d_ptr->m_rubberBand && event->button() == Qt::RightButton) { // If vertical or horizontal rubberband mode, restrict zoom out to specified axis. // Since there is no suitable API for that, use zoomIn with rect bigger than the // plot area. if (d_ptr->m_rubberBandFlags == VerticalRubberBand || d_ptr->m_rubberBandFlags == HorizontalRubberBand) { QRectF rect = d_ptr->m_chart->plotArea(); if (d_ptr->m_rubberBandFlags == VerticalRubberBand) { qreal adjustment = rect.height() / 2; rect.adjust(0, -adjustment, 0, adjustment); } else if (d_ptr->m_rubberBandFlags == HorizontalRubberBand) { qreal adjustment = rect.width() / 2; rect.adjust(-adjustment, 0, adjustment, 0); } d_ptr->m_chart->zoomIn(rect); } else { d_ptr->m_chart->zoomOut(); } event->accept(); } else { #endif QGraphicsView::mouseReleaseEvent(event); #ifndef QT_NO_RUBBERBAND } #endif } #ifdef Q_OS_MACOS #if QT_CONFIG(wheelevent) void QChartView::wheelEvent(QWheelEvent *event) { Q_UNUSED(event) // We just need to override wheelEvent, or scrolling won't work correctly on macOS trackpad // (QTBUG-77403) } #endif #endif /*! Resizes and updates the chart area using the data specified by \a event. */ void QChartView::resizeEvent(QResizeEvent *event) { QGraphicsView::resizeEvent(event); d_ptr->resize(); } /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// QChartViewPrivate::QChartViewPrivate(QChartView *q, QChart *chart) : q_ptr(q), m_scene(new QGraphicsScene(q)), m_chart(chart), #ifndef QT_NO_RUBBERBAND m_rubberBand(nullptr), #endif m_rubberBandFlags(QChartView::NoRubberBand) { q_ptr->setFrameShape(QFrame::NoFrame); q_ptr->setBackgroundRole(QPalette::Window); q_ptr->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); q_ptr->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); q_ptr->setScene(m_scene); q_ptr->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); if (!m_chart) m_chart = new QChart(); m_scene->addItem(m_chart); } QChartViewPrivate::~QChartViewPrivate() { } void QChartViewPrivate::setChart(QChart *chart) { Q_ASSERT(chart); if (m_chart == chart) return; if (m_chart) m_scene->removeItem(m_chart); m_chart = chart; m_scene->addItem(m_chart); resize(); } void QChartViewPrivate::resize() { // Fit the chart into view if it has been rotated qreal sinA = qAbs(q_ptr->transform().m21()); qreal cosA = qAbs(q_ptr->transform().m11()); QSize chartSize = q_ptr->size(); if (sinA == 1.0) { chartSize.setHeight(q_ptr->size().width()); chartSize.setWidth(q_ptr->size().height()); } else if (sinA != 0.0) { // Non-90 degree rotation, find largest square chart that can fit into the view. qreal minDimension = qMin(q_ptr->size().width(), q_ptr->size().height()); qreal h = (minDimension - (minDimension / ((sinA / cosA) + 1.0))) / sinA; chartSize.setHeight(h); chartSize.setWidth(h); } m_chart->resize(chartSize); q_ptr->setMinimumSize(m_chart->minimumSize().toSize().expandedTo(q_ptr->minimumSize())); q_ptr->setMaximumSize(q_ptr->maximumSize().boundedTo(m_chart->maximumSize().toSize())); q_ptr->setSceneRect(m_chart->geometry()); } QT_CHARTS_END_NAMESPACE #include "moc_qchartview.cpp"