qchartview.cpp
285 lines
| 8.7 KiB
| text/x-c
|
CppLexer
/ src / qchartview.cpp
Michal Klocek
|
r969 | /**************************************************************************** | ||
| ** | ||||
Miikka Heikkinen
|
r2432 | ** Copyright (C) 2013 Digia Plc | ||
|
Michal Klocek
|
r969 | ** All rights reserved. | ||
| ** For any questions to Digia, please use contact form at http://qt.digia.com | ||||
| ** | ||||
| ** This file is part of the Qt Commercial Charts Add-on. | ||||
| ** | ||||
| ** $QT_BEGIN_LICENSE$ | ||||
| ** Licensees holding valid Qt Commercial licenses may use this file in | ||||
| ** accordance with the Qt Commercial 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 | ||||
| \brief Standalone charting widget. | ||||
| QChartView is a standalone widget that can display charts. It does not require separate | ||||
|
Miikka Heikkinen
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r2494 | QGraphicsScene to work. If you want to display a chart in your existing QGraphicsScene, | ||
| you need to use the QChart (or QPolarChart) class instead. | ||||
|
Michal Klocek
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r969 | |||
|
Miikka Heikkinen
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r2494 | \sa QChart, QPolarChart | ||
|
Michal Klocek
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r969 | */ | ||
| QTCOMMERCIALCHART_BEGIN_NAMESPACE | ||||
|
Michal Klocek
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r1290 | /*! | ||
| Constructs a chartView object with parent \a parent. | ||||
| */ | ||||
Jani Honkonen
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r2097 | QChartView::QChartView(QWidget *parent) | ||
| : QGraphicsView(parent), | ||||
| d_ptr(new QChartViewPrivate(this)) | ||||
|
Michal Klocek
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r1290 | { | ||
| } | ||||
|
Michal Klocek
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r969 | /*! | ||
|
Miikka Heikkinen
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r2494 | Constructs a chartview object with parent \a parent to display a \a chart. | ||
| Ownership of the \a chart is passed to chartview. | ||||
|
Michal Klocek
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r969 | */ | ||
|
Michal Klocek
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r1290 | |||
|
Jani Honkonen
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r2097 | QChartView::QChartView(QChart *chart, QWidget *parent) | ||
| : QGraphicsView(parent), | ||||
| d_ptr(new QChartViewPrivate(this, chart)) | ||||
|
Michal Klocek
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r969 | { | ||
|
Michal Klocek
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r1290 | |||
|
Michal Klocek
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r969 | } | ||
| /*! | ||||
|
Miikka Heikkinen
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r2494 | Destroys the chartview object and the associated chart. | ||
|
Michal Klocek
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r969 | */ | ||
| QChartView::~QChartView() | ||||
| { | ||||
| } | ||||
| /*! | ||||
|
Miikka Heikkinen
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r2494 | Returns the pointer to the associated chart. | ||
|
Michal Klocek
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r969 | */ | ||
|
Jani Honkonen
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r2104 | QChart *QChartView::chart() const | ||
|
Michal Klocek
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r969 | { | ||
| return d_ptr->m_chart; | ||||
| } | ||||
|
Jani Honkonen
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r2056 | /*! | ||
| Sets the current chart to \a chart. Ownership of the new chart is passed to chartview | ||||
| and ownership of the previous chart is released. | ||||
|
Miikka Heikkinen
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r2494 | To avoid memory leaks users need to make sure the previous chart is deleted. | ||
|
Jani Honkonen
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r2056 | */ | ||
| void QChartView::setChart(QChart *chart) | ||||
| { | ||||
| d_ptr->setChart(chart); | ||||
| } | ||||
|
Michal Klocek
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r969 | /*! | ||
|
Miikka Heikkinen
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r2494 | 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. | ||||
|
Michal Klocek
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r969 | */ | ||
|
Jani Honkonen
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r2104 | void QChartView::setRubberBand(const RubberBands &rubberBand) | ||
|
Michal Klocek
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r969 | { | ||
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Jani Honkonen
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r2097 | d_ptr->m_rubberBandFlags = rubberBand; | ||
|
Michal Klocek
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r969 | |||
| if (!d_ptr->m_rubberBandFlags) { | ||||
| delete d_ptr->m_rubberBand; | ||||
|
Jani Honkonen
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r2097 | d_ptr->m_rubberBand = 0; | ||
|
Michal Klocek
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r969 | return; | ||
| } | ||||
| if (!d_ptr->m_rubberBand) { | ||||
| d_ptr->m_rubberBand = new QRubberBand(QRubberBand::Rectangle, this); | ||||
| d_ptr->m_rubberBand->setEnabled(true); | ||||
| } | ||||
| } | ||||
| /*! | ||||
|
Miikka Heikkinen
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r2494 | Returns the rubber band flags that are currently being used by the widget. | ||
|
Michal Klocek
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r969 | */ | ||
| QChartView::RubberBands QChartView::rubberBand() const | ||||
| { | ||||
| return d_ptr->m_rubberBandFlags; | ||||
| } | ||||
| /*! | ||||
|
Miikka Heikkinen
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r2494 | 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. | ||||
|
Michal Klocek
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r969 | */ | ||
| void QChartView::mousePressEvent(QMouseEvent *event) | ||||
| { | ||||
|
Jani Honkonen
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r2097 | if (d_ptr->m_rubberBand && d_ptr->m_rubberBand->isEnabled() && event->button() == Qt::LeftButton) { | ||
|
Michal Klocek
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r969 | |||
|
Michal Klocek
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r1883 | QRectF plotArea = d_ptr->m_chart->plotArea(); | ||
|
Michal Klocek
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r969 | |||
|
Michal Klocek
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r1883 | if (plotArea.contains(event->pos())) { | ||
|
Michal Klocek
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r969 | d_ptr->m_rubberBandOrigin = event->pos(); | ||
| d_ptr->m_rubberBand->setGeometry(QRect(d_ptr->m_rubberBandOrigin, QSize())); | ||||
| d_ptr->m_rubberBand->show(); | ||||
| event->accept(); | ||||
| } | ||||
|
Jani Honkonen
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r2097 | } else { | ||
|
Michal Klocek
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r969 | QGraphicsView::mousePressEvent(event); | ||
| } | ||||
| } | ||||
| /*! | ||||
|
Miikka Heikkinen
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r2494 | 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. | ||||
|
Michal Klocek
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r969 | */ | ||
| void QChartView::mouseMoveEvent(QMouseEvent *event) | ||||
| { | ||||
|
Jani Honkonen
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r2097 | if (d_ptr->m_rubberBand && d_ptr->m_rubberBand->isVisible()) { | ||
|
Michal Klocek
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r1961 | QRect rect = d_ptr->m_chart->plotArea().toRect(); | ||
|
Michal Klocek
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r969 | 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()); | ||||
|
Jani Honkonen
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r2097 | width = rect.width(); | ||
|
Michal Klocek
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r969 | } | ||
|
Jani Honkonen
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r2097 | d_ptr->m_rubberBand->setGeometry(QRect(d_ptr->m_rubberBandOrigin.x(), d_ptr->m_rubberBandOrigin.y(), width, height).normalized()); | ||
| } else { | ||||
|
Michal Klocek
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r969 | QGraphicsView::mouseMoveEvent(event); | ||
| } | ||||
| } | ||||
| /*! | ||||
|
Miikka Heikkinen
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r2494 | 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 rubber band is dismissed and the zoom is canceled. | ||||
|
Michal Klocek
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r969 | */ | ||
| void QChartView::mouseReleaseEvent(QMouseEvent *event) | ||||
| { | ||||
|
Jani Honkonen
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r2097 | if (d_ptr->m_rubberBand) { | ||
|
Michal Klocek
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r969 | if (event->button() == Qt::LeftButton && d_ptr->m_rubberBand->isVisible()) { | ||
| d_ptr->m_rubberBand->hide(); | ||||
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Miikka Heikkinen
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r2416 | 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()); | ||||
| } | ||||
|
Michal Klocek
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r969 | d_ptr->m_chart->zoomIn(rect); | ||
| event->accept(); | ||||
| } | ||||
|
Jani Honkonen
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r2097 | if (event->button() == Qt::RightButton) { | ||
|
Michal Klocek
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r969 | d_ptr->m_chart->zoomOut(); | ||
| event->accept(); | ||||
| } | ||||
|
Jani Honkonen
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r2097 | } else { | ||
|
Michal Klocek
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r969 | QGraphicsView::mouseReleaseEvent(event); | ||
| } | ||||
| } | ||||
| /*! | ||||
| Resizes and updates the chart area using the \a event data | ||||
| */ | ||||
| void QChartView::resizeEvent(QResizeEvent *event) | ||||
| { | ||||
| QGraphicsView::resizeEvent(event); | ||||
|
Jani Honkonen
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r2056 | d_ptr->resize(); | ||
|
Michal Klocek
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r969 | } | ||
| /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// | ||||
|
Jani Honkonen
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r2104 | QChartViewPrivate::QChartViewPrivate(QChartView *q, QChart *chart) | ||
|
Jani Honkonen
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r2097 | : q_ptr(q), | ||
| m_scene(new QGraphicsScene(q)), | ||||
| m_chart(chart), | ||||
| m_rubberBand(0), | ||||
| m_rubberBandFlags(QChartView::NoRubberBand) | ||||
|
Michal Klocek
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r969 | { | ||
|
Michal Klocek
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r1290 | 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); | ||||
|
Jani Honkonen
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r2097 | if (!m_chart) | ||
| m_chart = new QChart(); | ||||
|
Michal Klocek
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r1290 | m_scene->addItem(m_chart); | ||
|
Michal Klocek
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r969 | } | ||
| QChartViewPrivate::~QChartViewPrivate() | ||||
| { | ||||
| } | ||||
|
Jani Honkonen
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r2056 | 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() | ||||
| { | ||||
|
Miikka Heikkinen
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r2507 | // Fit the chart into view if it has been rotated | ||
| qreal sinA = qAbs(q_ptr->transform().m21()); | ||||
| qreal cosA = qAbs(q_ptr->transform().m11()); | ||||
|
Miikka Heikkinen
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r2500 | QSize chartSize = q_ptr->size(); | ||
|
Miikka Heikkinen
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r2507 | if (sinA == 1.0) { | ||
|
Miikka Heikkinen
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r2500 | chartSize.setHeight(q_ptr->size().width()); | ||
| chartSize.setWidth(q_ptr->size().height()); | ||||
|
Miikka Heikkinen
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r2507 | } 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); | ||||
|
Miikka Heikkinen
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r2500 | } | ||
| m_chart->resize(chartSize); | ||||
|
Jani Honkonen
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r2056 | q_ptr->setMinimumSize(m_chart->minimumSize().toSize()); | ||
| q_ptr->setSceneRect(m_chart->geometry()); | ||||
| } | ||||
|
Michal Klocek
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r969 | #include "moc_qchartview.cpp" | ||
| QTCOMMERCIALCHART_END_NAMESPACE | ||||