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Diffstat (limited to 'src/charts/qchartview.cpp')
| -rw-r--r-- | src/charts/qchartview.cpp | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/src/charts/qchartview.cpp b/src/charts/qchartview.cpp new file mode 100644 index 00000000..234ef080 --- /dev/null +++ b/src/charts/qchartview.cpp @@ -0,0 +1,317 @@ +/**************************************************************************** +** +** Copyright (C) 2014 Digia Plc +** All rights reserved. +** For any questions to Digia, please use contact form at http://qt.digia.com +** +** This file is part of the Qt Enterprise Charts Add-on. +** +** $QT_BEGIN_LICENSE$ +** Licensees holding valid Qt Enterprise licenses may use this file in +** accordance with the Qt Enterprise License Agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. +** +** If you have questions regarding the use of this file, please use +** contact form at http://qt.digia.com +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qchartview.h" +#include "qchartview_p.h" +#include "qchart_p.h" +#include <QGraphicsScene> +#include <QRubberBand> + +/*! + \enum QChartView::RubberBand + + This enum describes the different types of rubber bands that can be used for zoom rect selection + + \value NoRubberBand + \value VerticalRubberBand + \value HorizonalRubberBand + \value RectangleRubberBand +*/ + +/*! + \class QChartView + \inmodule Qt Charts + \brief Standalone charting widget. + + QChartView is a standalone widget that can display charts. It does not require separate + QGraphicsScene to work. If you want to display a chart in your existing QGraphicsScene, + you need to use the QChart (or QPolarChart) class instead. + + \sa QChart, QPolarChart +*/ + +QT_CHARTS_BEGIN_NAMESPACE + +/*! + Constructs a chartView object with parent \a parent. +*/ + +QChartView::QChartView(QWidget *parent) + : QGraphicsView(parent), + d_ptr(new QChartViewPrivate(this)) +{ + +} + +/*! + Constructs a chartview object with parent \a parent to display a \a chart. + Ownership of the \a chart is passed to chartview. +*/ + +QChartView::QChartView(QChart *chart, QWidget *parent) + : QGraphicsView(parent), + d_ptr(new QChartViewPrivate(this, chart)) +{ + +} + + +/*! + Destroys the chartview 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. Ownership of the new chart is passed to chartview + and ownership of the previous chart is released. + + To avoid memory leaks users need to make sure the previous chart is deleted. +*/ + +void QChartView::setChart(QChart *chart) +{ + d_ptr->setChart(chart); +} + +/*! + Sets the rubber band flags to \a rubberBand. + 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 = 0; + 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 widget. +*/ +QChartView::RubberBands QChartView::rubberBand() const +{ + return d_ptr->m_rubberBandFlags; +} + +/*! + If Left mouse button is pressed and the rubber band is enabled the \a event is accepted and the rubber band is displayed on the screen allowing the user to select the zoom area. + If different mouse button is pressed and/or the rubber band is disabled then the \a event is passed to QGraphicsView::mousePressEvent() implementation. +*/ +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 rectange has been displayed in pressEvent then \a 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(HorizonalRubberBand)) { + 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 left mouse button is released and the rubber band is enabled then \a event is accepted and + the view is zoomed into the rect specified by the rubber band. + If it is a right mouse button \a event then 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 == HorizonalRubberBand) { + 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 == HorizonalRubberBand) { + 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 == HorizonalRubberBand) { + 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 +} + +/*! + Resizes and updates the chart area using the \a event data +*/ +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(0), +#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()); + q_ptr->setSceneRect(m_chart->geometry()); +} + +#include "moc_qchartview.cpp" + +QT_CHARTS_END_NAMESPACE |