qchartview.cpp
315 lines
| 9.9 KiB
| text/x-c
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CppLexer
Michal Klocek
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r969 | /**************************************************************************** | ||
| ** | ||||
Titta Heikkala
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r2776 | ** Copyright (C) 2015 The Qt Company Ltd | ||
|
Michal Klocek
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r969 | ** All rights reserved. | ||
|
Titta Heikkala
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r2776 | ** For any questions to The Qt Company, please use contact form at http://qt.io | ||
|
Michal Klocek
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r969 | ** | ||
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Titta Heikkala
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r2740 | ** This file is part of the Qt Charts module. | ||
|
Michal Klocek
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r969 | ** | ||
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Titta Heikkala
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r2740 | ** Licensees holding valid commercial license for Qt may use this file in | ||
| ** accordance with the Qt License Agreement provided with the Software | ||||
| ** or, alternatively, in accordance with the terms contained in a written | ||||
|
Titta Heikkala
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r2776 | ** agreement between you and The Qt Company. | ||
|
Michal Klocek
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r969 | ** | ||
| ** If you have questions regarding the use of this file, please use | ||||
|
Titta Heikkala
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r2740 | ** contact form at http://qt.io | ||
|
Michal Klocek
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r969 | ** | ||
| ****************************************************************************/ | ||||
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Titta Heikkala
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r2714 | #include <QtCharts/QChartView> | ||
| #include <private/qchartview_p.h> | ||||
| #include <private/qchart_p.h> | ||||
| #include <QtWidgets/QGraphicsScene> | ||||
| #include <QtWidgets/QRubberBand> | ||||
|
Michal Klocek
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r969 | |||
| /*! | ||||
| \enum QChartView::RubberBand | ||||
| This enum describes the different types of rubber bands that can be used for zoom rect selection | ||||
| \value NoRubberBand | ||||
| \value VerticalRubberBand | ||||
Miikka Heikkinen
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r2742 | \value HorizontalRubberBand | ||
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Michal Klocek
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r969 | \value RectangleRubberBand | ||
| */ | ||||
| /*! | ||||
| \class QChartView | ||||
Titta Heikkala
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r2639 | \inmodule Qt Charts | ||
|
Michal Klocek
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r969 | \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. | ||||
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Michal Klocek
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r969 | |||
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Miikka Heikkinen
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r2494 | \sa QChart, QPolarChart | ||
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Michal Klocek
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r969 | */ | ||
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Titta Heikkala
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r2712 | QT_CHARTS_BEGIN_NAMESPACE | ||
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Michal Klocek
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r969 | |||
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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 | /*! | ||
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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. | ||||
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Michal Klocek
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r969 | */ | ||
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Michal Klocek
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r1290 | |||
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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 | { | ||
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Michal Klocek
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r1290 | |||
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Michal Klocek
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r969 | } | ||
| /*! | ||||
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Miikka Heikkinen
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r2494 | Destroys the chartview object and the associated chart. | ||
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Michal Klocek
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r969 | */ | ||
| QChartView::~QChartView() | ||||
| { | ||||
| } | ||||
| /*! | ||||
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Miikka Heikkinen
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r2494 | Returns the pointer to the associated chart. | ||
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Michal Klocek
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r969 | */ | ||
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Jani Honkonen
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r2104 | QChart *QChartView::chart() const | ||
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Michal Klocek
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r969 | { | ||
| return d_ptr->m_chart; | ||||
| } | ||||
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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. | ||||
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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 | */ | ||
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Jani Honkonen
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r2104 | void QChartView::setRubberBand(const RubberBands &rubberBand) | ||
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Michal Klocek
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r969 | { | ||
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Titta Heikkala
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r2623 | #ifndef QT_NO_RUBBERBAND | ||
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Jani Honkonen
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r2097 | d_ptr->m_rubberBandFlags = rubberBand; | ||
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Michal Klocek
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r969 | |||
| if (!d_ptr->m_rubberBandFlags) { | ||||
| delete d_ptr->m_rubberBand; | ||||
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Jani Honkonen
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r2097 | d_ptr->m_rubberBand = 0; | ||
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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); | ||||
| } | ||||
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Titta Heikkala
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r2623 | #else | ||
| Q_UNUSED(rubberBand); | ||||
| qWarning("Unable to set rubber band because Qt is configured without it."); | ||||
| #endif | ||||
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Michal Klocek
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r969 | } | ||
| /*! | ||||
|
Miikka Heikkinen
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r2494 | Returns the rubber band flags that are currently being used by the widget. | ||
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Michal Klocek
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r969 | */ | ||
| QChartView::RubberBands QChartView::rubberBand() const | ||||
| { | ||||
| return d_ptr->m_rubberBandFlags; | ||||
| } | ||||
| /*! | ||||
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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) | ||||
| { | ||||
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Titta Heikkala
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r2623 | #ifndef QT_NO_RUBBERBAND | ||
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Titta Heikkala
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r2609 | 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(); | ||||
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Jani Honkonen
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r2097 | } else { | ||
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Titta Heikkala
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r2623 | #endif | ||
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Michal Klocek
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r969 | QGraphicsView::mousePressEvent(event); | ||
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Titta Heikkala
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r2623 | #ifndef QT_NO_RUBBERBAND | ||
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Michal Klocek
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r969 | } | ||
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Titta Heikkala
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r2623 | #endif | ||
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Michal Klocek
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r969 | } | ||
| /*! | ||||
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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) | ||||
| { | ||||
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Titta Heikkala
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r2623 | #ifndef QT_NO_RUBBERBAND | ||
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Jani Honkonen
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r2097 | if (d_ptr->m_rubberBand && d_ptr->m_rubberBand->isVisible()) { | ||
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Michal Klocek
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r1961 | QRect rect = d_ptr->m_chart->plotArea().toRect(); | ||
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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(); | ||||
| } | ||||
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Miikka Heikkinen
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r2742 | if (!d_ptr->m_rubberBandFlags.testFlag(HorizontalRubberBand)) { | ||
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Michal Klocek
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r969 | d_ptr->m_rubberBandOrigin.setX(rect.left()); | ||
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Jani Honkonen
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r2097 | width = rect.width(); | ||
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Michal Klocek
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r969 | } | ||
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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 { | ||||
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Titta Heikkala
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r2623 | #endif | ||
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Michal Klocek
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r969 | QGraphicsView::mouseMoveEvent(event); | ||
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Titta Heikkala
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r2623 | #ifndef QT_NO_RUBBERBAND | ||
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Michal Klocek
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r969 | } | ||
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Titta Heikkala
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r2623 | #endif | ||
|
Michal Klocek
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r969 | } | ||
| /*! | ||||
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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. | ||||
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Miikka Heikkinen
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r2545 | If it is a right mouse button \a event then the view is zoomed out. | ||
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Michal Klocek
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r969 | */ | ||
| void QChartView::mouseReleaseEvent(QMouseEvent *event) | ||||
| { | ||||
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Titta Heikkala
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r2623 | #ifndef QT_NO_RUBBERBAND | ||
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Titta Heikkala
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r2609 | if (d_ptr->m_rubberBand && d_ptr->m_rubberBand->isVisible()) { | ||
| if (event->button() == Qt::LeftButton) { | ||||
|
Michal Klocek
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r969 | 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()); | ||||
|
Miikka Heikkinen
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r2742 | } else if (d_ptr->m_rubberBandFlags == HorizontalRubberBand) { | ||
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Miikka Heikkinen
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r2416 | 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(); | ||||
| } | ||||
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Titta Heikkala
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r2656 | } else if (d_ptr->m_rubberBand && event->button() == Qt::RightButton) { | ||
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Miikka Heikkinen
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r2546 | // 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 | ||||
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Miikka Heikkinen
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r2742 | || d_ptr->m_rubberBandFlags == HorizontalRubberBand) { | ||
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Miikka Heikkinen
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r2546 | QRectF rect = d_ptr->m_chart->plotArea(); | ||
| if (d_ptr->m_rubberBandFlags == VerticalRubberBand) { | ||||
| qreal adjustment = rect.height() / 2; | ||||
| rect.adjust(0, -adjustment, 0, adjustment); | ||||
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Miikka Heikkinen
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r2742 | } else if (d_ptr->m_rubberBandFlags == HorizontalRubberBand) { | ||
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Miikka Heikkinen
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r2546 | qreal adjustment = rect.width() / 2; | ||
| rect.adjust(-adjustment, 0, adjustment, 0); | ||||
| } | ||||
| d_ptr->m_chart->zoomIn(rect); | ||||
| } else { | ||||
| d_ptr->m_chart->zoomOut(); | ||||
| } | ||||
|
Michal Klocek
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r969 | event->accept(); | ||
|
Jani Honkonen
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r2097 | } else { | ||
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Titta Heikkala
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r2623 | #endif | ||
|
Michal Klocek
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r969 | QGraphicsView::mouseReleaseEvent(event); | ||
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Titta Heikkala
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r2623 | #ifndef QT_NO_RUBBERBAND | ||
|
Michal Klocek
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r969 | } | ||
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Titta Heikkala
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r2623 | #endif | ||
|
Michal Klocek
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r969 | } | ||
| /*! | ||||
| Resizes and updates the chart area using the \a event data | ||||
| */ | ||||
| void QChartView::resizeEvent(QResizeEvent *event) | ||||
| { | ||||
| QGraphicsView::resizeEvent(event); | ||||
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Jani Honkonen
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r2056 | d_ptr->resize(); | ||
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Michal Klocek
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r969 | } | ||
| /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// | ||||
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Jani Honkonen
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r2104 | QChartViewPrivate::QChartViewPrivate(QChartView *q, QChart *chart) | ||
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Jani Honkonen
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r2097 | : q_ptr(q), | ||
| m_scene(new QGraphicsScene(q)), | ||||
| m_chart(chart), | ||||
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Titta Heikkala
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r2623 | #ifndef QT_NO_RUBBERBAND | ||
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Jani Honkonen
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r2097 | m_rubberBand(0), | ||
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Titta Heikkala
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r2623 | #endif | ||
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Jani Honkonen
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r2097 | m_rubberBandFlags(QChartView::NoRubberBand) | ||
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Michal Klocek
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r969 | { | ||
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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(); | ||||
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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(); | ||
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Miikka Heikkinen
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r2507 | if (sinA == 1.0) { | ||
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Miikka Heikkinen
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r2500 | chartSize.setHeight(q_ptr->size().width()); | ||
| chartSize.setWidth(q_ptr->size().height()); | ||||
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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); | ||||
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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" | ||
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Titta Heikkala
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r2712 | QT_CHARTS_END_NAMESPACE | ||