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/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.digia.com
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**
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** This file is part of the Qt Commercial Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.digia.com
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qlegend.h"
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#include "qchart_p.h"
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#include "qseries.h"
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#include "legendmarker_p.h"
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#include "legendscrollbutton_p.h"
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#include "qxyseries.h"
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#include "qlineseries.h"
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#include "qareaseries.h"
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#include "qscatterseries.h"
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#include "qsplineseries.h"
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#include "qbarseries.h"
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#include "qstackedbarseries.h"
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#include "qpercentbarseries.h"
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#include "qbarset.h"
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#include "qpieseries.h"
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#include "qpieslice.h"
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#include "chartpresenter_p.h"
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#include <QPainter>
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#include <QPen>
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#include <QGraphicsSceneEvent>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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/*!
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\class QLegend
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\brief part of QtCommercial chart API.
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QLegend is a graphical object, whics displays legend of the chart. Legend state is updated by QChart, when
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series have been changed. By default, legend is drawn by QChart, but user can set a new parent to legend and
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handle the drawing manually.
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User isn't supposed to create or delete legend objects, but can reference it via QChart class.
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\mainclass
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\sa QChart, QSeries
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*/
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/*!
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\enum QLegend::Layout
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This enum describes the possible position for legend inside chart.
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\value LayoutTop
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\value LayoutBottom
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\value LayoutLeft
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\value LayoutRight
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*/
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/*!
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\fn void QLegend::clicked(QSeries* series, Qt::MouseButton button)
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\brief Notifies when series has been clicked on legend \a series \a button
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*/
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/*!
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\fn void QLegend::clicked(QBarSet* barset, Qt::MouseButton button)
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\brief Notifies when barset has been clicked on legend \a barset \a button
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*/
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/*!
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\fn void QLegend::clicked(QPieSlice* slice, Qt::MouseButton button)
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\brief Notifies when pie slice has been clicked on legend \a slice \a button
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*/
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/*!
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Constructs the legend object and sets the parent to \a parent
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*/
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QLegend::QLegend(QChart *chart):QGraphicsWidget(chart),
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m_margin(5),
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m_pos(0,0),
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m_minimumSize(50,20), // TODO: magic numbers
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m_maximumSize(150,100),
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m_size(m_minimumSize),
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m_brush(Qt::darkGray), // TODO: default should come from theme
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m_alignment(QLegend::AlignmentTop),
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mFirstMarker(0),
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m_attachedToChart(true),
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m_chart(chart)
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{
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m_scrollButtonLeft = new LegendScrollButton(LegendScrollButton::ScrollButtonIdLeft, this);
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m_scrollButtonRight = new LegendScrollButton(LegendScrollButton::ScrollButtonIdRight, this);
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m_scrollButtonUp = new LegendScrollButton(LegendScrollButton::ScrollButtonIdUp, this);
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m_scrollButtonDown = new LegendScrollButton(LegendScrollButton::ScrollButtonIdDown, this);
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setZValue(ChartPresenter::LegendZValue);
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}
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/*!
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Paints the legend to given \a painter. Paremeters \a option and \a widget arent used.
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*/
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void QLegend::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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Q_UNUSED(option)
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Q_UNUSED(widget)
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painter->setOpacity(opacity());
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painter->setPen(m_pen);
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painter->setBrush(m_brush);
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// painter->drawRect(boundingRect());
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}
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/*!
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Bounding rect of legend.
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*/
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QRectF QLegend::boundingRect() const
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{
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return QRectF(m_pos,m_size);
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}
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/*!
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Sets the \a brush of legend. Brush affects the background of legend.
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*/
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void QLegend::setBrush(const QBrush &brush)
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{
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if (m_brush != brush) {
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m_brush = brush;
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update();
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}
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}
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/*!
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Returns the brush used by legend.
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*/
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QBrush QLegend::brush() const
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{
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return m_brush;
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}
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/*!
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Sets the \a pen of legend. Pen affects the legend borders.
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*/
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void QLegend::setPen(const QPen &pen)
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{
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if (m_pen != pen) {
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m_pen = pen;
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update();
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}
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}
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/*!
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Returns the pen used by legend
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*/
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QPen QLegend::pen() const
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{
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return m_pen;
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}
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/*!
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Sets the \a preferred layout for legend. Legend tries to paint itself on the defined position in chart.
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\sa QLegend::Layout
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*/
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void QLegend::setAlignmnent(QLegend::Alignments alignment)
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{
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// if (!m_attachedToChart) {
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m_alignment = alignment;
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updateLayout();
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m_chart->resize(m_chart->size());
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// }
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}
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/*!
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Returns the preferred layout for legend
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*/
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QLegend::Alignments QLegend::alignment() const
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{
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return m_alignment;
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}
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/*!
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Returns the maximum size of legend.
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*/
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QSizeF QLegend::maximumSize() const
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{
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return m_maximumSize;
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}
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/*!
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Sets the maximum \a size for legend. The legend can't grow bigger than this size. If there are
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more series than legend can fit to this size, scroll buttons are displayed.
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*/
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void QLegend::setMaximumSize(const QSizeF size)
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{
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m_maximumSize = size;
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updateLayout();
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}
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/*!
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Returns the current size of legend.
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*/
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QSizeF QLegend::size() const
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{
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return m_size;
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}
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/*!
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Sets the \a size of legend. If size is bigger than maximum size of legend, the legend is resized to the maximum size.
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\sa setMmaximumSize()
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*/
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void QLegend::setSize(const QSizeF size)
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{
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m_size = size;
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if (m_size.width() > m_maximumSize.width()) {
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m_size.setWidth(m_maximumSize.width());
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}
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if (m_size.height() > m_maximumSize.height()) {
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m_size.setHeight(m_maximumSize.height());
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}
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}
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/*!
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Sets position of legend to \a pos
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*/
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void QLegend::setPos(const QPointF &pos)
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{
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m_pos = pos;
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updateLayout();
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}
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/*!
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\internal \a series \a domain Should be called when series is added to chart.
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*/
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void QLegend::handleSeriesAdded(QSeries *series, Domain *domain)
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{
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Q_UNUSED(domain)
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switch (series->type())
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{
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case QSeries::SeriesTypeLine: {
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QLineSeries *lineSeries = static_cast<QLineSeries *>(series);
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appendMarkers(lineSeries);
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break;
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}
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case QSeries::SeriesTypeArea: {
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QAreaSeries *areaSeries = static_cast<QAreaSeries *>(series);
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appendMarkers(areaSeries);
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break;
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}
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case QSeries::SeriesTypeBar: {
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QBarSeries *barSeries = static_cast<QBarSeries *>(series);
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appendMarkers(barSeries);
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break;
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}
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case QSeries::SeriesTypeStackedBar: {
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QStackedBarSeries *stackedBarSeries = static_cast<QStackedBarSeries *>(series);
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appendMarkers(stackedBarSeries);
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break;
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}
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case QSeries::SeriesTypePercentBar: {
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QPercentBarSeries *percentBarSeries = static_cast<QPercentBarSeries *>(series);
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appendMarkers(percentBarSeries);
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break;
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}
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case QSeries::SeriesTypeScatter: {
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QScatterSeries *scatterSeries = static_cast<QScatterSeries *>(series);
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appendMarkers(scatterSeries);
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break;
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}
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case QSeries::SeriesTypePie: {
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QPieSeries *pieSeries = static_cast<QPieSeries *>(series);
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appendMarkers(pieSeries);
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connect(pieSeries,SIGNAL(added(QList<QPieSlice*>)),this,SLOT(handleAdded(QList<QPieSlice*>)));
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break;
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}
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case QSeries::SeriesTypeSpline: {
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QSplineSeries *splineSeries = static_cast<QSplineSeries *>(series);
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appendMarkers(splineSeries);
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break;
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}
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default: {
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qWarning()<< "QLegend::handleSeriesAdded" << series->type() << "unknown series type.";
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break;
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}
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}
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updateLayout();
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}
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/*!
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\internal \a series Should be called when series is removed from chart.
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*/
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void QLegend::handleSeriesRemoved(QSeries *series)
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{
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switch (series->type())
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{
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case QSeries::SeriesTypeArea: {
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QAreaSeries *areaSeries = static_cast<QAreaSeries *>(series);
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deleteMarkers(areaSeries);
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break;
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}
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case QSeries::SeriesTypePie: {
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QPieSeries *pieSeries = static_cast<QPieSeries *>(series);
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disconnect(pieSeries, SIGNAL(added(QList<QPieSlice *>)), this, SLOT(handleAdded(QList<QPieSlice *>)));
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deleteMarkers(series);
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break;
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}
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default: {
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// All other types
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deleteMarkers(series);
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break;
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}
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}
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updateLayout();
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}
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/*!
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\internal \a slices Should be called when slices are added to pie chart.
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*/
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void QLegend::handleAdded(QList<QPieSlice *> slices)
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{
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QPieSeries* series = static_cast<QPieSeries *> (sender());
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foreach(QPieSlice* s, slices) {
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LegendMarker* marker = new LegendMarker(series, s, this);
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marker->setName(s->label());
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marker->setBrush(s->brush());
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connect(marker, SIGNAL(clicked(QPieSlice*,Qt::MouseButton)),
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this, SIGNAL(clicked(QPieSlice*,Qt::MouseButton)));
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connect(s, SIGNAL(changed()), marker, SLOT(changed()));
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connect(s, SIGNAL(destroyed()), marker, SLOT(deleteLater()));
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connect(marker, SIGNAL(destroyed()), this, SLOT(handleMarkerDestroyed()));
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m_markers.append(marker);
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childItems().append(marker);
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}
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updateLayout();
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}
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/*!
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\internal \a slices Should be called when slices are removed from pie chart. Currently unused,
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because removed slices are also deleted and we listen destroyed signal
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*/
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void QLegend::handleRemoved(QList<QPieSlice *> slices)
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{
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Q_UNUSED(slices)
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}
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/*!
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\internal Notifies legend that some marker has been removed. Sent by legend markers when destroyed
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*/
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void QLegend::handleMarkerDestroyed()
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{
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LegendMarker* m = static_cast<LegendMarker *> (sender());
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m_markers.removeOne(m);
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updateLayout();
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}
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/*!
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\internal \a event Handles clicked signals from scroll buttons
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*/
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void QLegend::scrollButtonClicked(LegendScrollButton *scrollButton)
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{
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Q_ASSERT(scrollButton);
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switch (scrollButton->id()) {
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case LegendScrollButton::ScrollButtonIdLeft:
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case LegendScrollButton::ScrollButtonIdUp: {
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// Lower limit is same in these cases
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mFirstMarker--;
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checkFirstMarkerBounds();
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break;
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}
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case LegendScrollButton::ScrollButtonIdRight:
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case LegendScrollButton::ScrollButtonIdDown: {
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mFirstMarker++;
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checkFirstMarkerBounds();
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break;
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}
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default: {
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break;
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}
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}
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updateLayout();
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}
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/*!
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Detaches the legend from chart. Chart won't change layout of the legend.
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*/
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void QLegend::detachFromChart()
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{
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m_attachedToChart = false;
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}
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/*!
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Attaches the legend to chart. Chart may change layout of the legend.
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*/
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void QLegend::attachToChart()
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{
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m_attachedToChart = true;
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}
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/*!
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Returns true, if legend is attached to chart.
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*/
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bool QLegend::attachedToChart()
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{
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return m_attachedToChart;
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}
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/*!
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\internal Helper function. Appends markers from \a series to legend.
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*/
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void QLegend::appendMarkers(QAreaSeries* series)
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{
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LegendMarker* marker = new LegendMarker(series,this);
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connect(marker, SIGNAL(clicked(QSeries *, Qt::MouseButton)), this, SIGNAL(clicked(QSeries *, Qt::MouseButton)));
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connect(marker, SIGNAL(destroyed()), this, SLOT(handleMarkerDestroyed()));
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connect(series,SIGNAL(updated()),marker,SLOT(changed()));
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marker->changed();
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m_markers.append(marker);
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childItems().append(marker);
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}
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/*!
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\internal Helper function. Appends markers from \a series to legend.
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*/
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void QLegend::appendMarkers(QXYSeries* series)
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{
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LegendMarker* marker = new LegendMarker(series,this);
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connect(marker, SIGNAL(clicked(QSeries *, Qt::MouseButton)), this, SIGNAL(clicked(QSeries *, Qt::MouseButton)));
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connect(marker, SIGNAL(destroyed()), this, SLOT(handleMarkerDestroyed()));
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connect(series,SIGNAL(updated()),marker,SLOT(changed()));
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marker->changed();
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m_markers.append(marker);
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childItems().append(marker);
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}
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/*!
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\internal Helper function. Appends markers from \a series to legend.
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*/
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void QLegend::appendMarkers(QBarSeries *series)
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{
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foreach(QBarSet* set, series->barSets()) {
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LegendMarker* marker = new LegendMarker(series, set, this);
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connect(marker, SIGNAL(clicked(QBarSet *, Qt::MouseButton)),
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this, SIGNAL(clicked(QBarSet *, Qt::MouseButton)));
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connect(set, SIGNAL(valueChanged()), marker, SLOT(changed()));
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connect(marker, SIGNAL(destroyed()), this, SLOT(handleMarkerDestroyed()));
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marker->changed();
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m_markers.append(marker);
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childItems().append(marker);
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}
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}
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/*!
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\internal Helper function. Appends markers from \a series to legend.
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*/
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void QLegend::appendMarkers(QPieSeries *series)
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{
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foreach(QPieSlice* slice, series->slices()) {
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LegendMarker* marker = new LegendMarker(series, slice, this);
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connect(marker, SIGNAL(clicked(QPieSlice *, Qt::MouseButton)),
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this, SIGNAL(clicked(QPieSlice *, Qt::MouseButton)));
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connect(slice, SIGNAL(changed()), marker, SLOT(changed()));
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connect(slice, SIGNAL(destroyed()), marker, SLOT(deleteLater()));
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connect(marker, SIGNAL(destroyed()), this, SLOT(handleMarkerDestroyed()));
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marker->changed();
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m_markers.append(marker);
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childItems().append(marker);
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}
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}
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/*!
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\internal Deletes all markers that are created from \a series
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*/
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void QLegend::deleteMarkers(QSeries *series)
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{
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// Search all markers that belong to given series and delete them.
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foreach (LegendMarker *m, m_markers) {
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if (m->series() == series) {
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m_markers.removeOne(m);
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delete m;
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}
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}
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}
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/*!
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\internal Updates layout of legend. Tries to fit as many markers as possible up to the maximum size of legend.
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If items don't fit, sets the visibility of scroll buttons accordingly.
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Causes legend to be resized.
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*/
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void QLegend::updateLayout()
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{
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// Calculate layout for markers and text
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if (m_markers.count() <= 0) {
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// Nothing to do
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return;
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}
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checkFirstMarkerBounds();
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switch (m_alignment)
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{
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// Both cases organise items horizontally
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case QLegend::AlignmentBottom:
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case QLegend::AlignmentTop: {
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layoutHorizontal();
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break;
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}
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// Both cases organize items vertically
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case QLegend::AlignmentLeft:
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case QLegend::AlignmentRight: {
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layoutVertical();
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break;
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}
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default: {
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break;
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}
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}
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}
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/*!
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\internal Organizes markers horizontally.
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Causes legend to be resized.
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*/
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void QLegend::layoutHorizontal()
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{
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// Find out widest item.
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QSizeF markerMaxSize = maximumMarkerSize();
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// Use max height as scroll button size
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rescaleScrollButtons(QSize(markerMaxSize.height() ,markerMaxSize.height()));
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qreal totalWidth = 0;
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qreal totalHeight = 0;
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qreal xStep = markerMaxSize.width();
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qreal x = m_pos.x() + m_margin;
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qreal y = m_pos.y() + m_margin;
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int column = 0;
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int maxColumns = 1;
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qreal scrollButtonWidth = 0;
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// Set correct visibility for scroll scrollbuttons
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if (scrollButtonsVisible()) {
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m_scrollButtonLeft->setVisible(true);
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m_scrollButtonRight->setVisible(true);
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// scrollbuttons visible, so add their width to total width
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totalWidth += (m_scrollButtonLeft->boundingRect().width() + m_margin) * 2;
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scrollButtonWidth = m_scrollButtonLeft->boundingRect().width() + m_margin;
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// start position changes by scrollbutton width
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x += scrollButtonWidth;
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} else {
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m_scrollButtonLeft->setVisible(false);
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m_scrollButtonRight->setVisible(false);
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}
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m_scrollButtonUp->setVisible(false);
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m_scrollButtonDown->setVisible(false);
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for (int i=0; i < m_markers.count(); i++) {
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LegendMarker *m = m_markers.at(i);
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if (i < mFirstMarker) {
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// Markers before first are not visible.
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m->setVisible(false);
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} else {
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if ((x + xStep + scrollButtonWidth + m_margin) > (m_pos.x() + m_maximumSize.width())) {
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// This marker would go outside legend rect.
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m->setVisible(false);
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} else {
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// This marker is ok
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m->setVisible(true);
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m->setPos(x, y);
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x += xStep;
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column++;
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}
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}
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maxColumns = column;
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}
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m_scrollButtonLeft->setPos(m_pos.x() + m_margin, y);
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m_scrollButtonRight->setPos(x + m_margin, y);
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totalWidth += maxColumns * markerMaxSize.width() + m_margin * 2;
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totalHeight = markerMaxSize.height() + m_margin * 2;
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m_size.setWidth(totalWidth);
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m_size.setHeight(totalHeight);
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}
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|
/*!
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\internal Organizes markers vertically.
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Causes legend to be resized.
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*/
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void QLegend::layoutVertical()
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{
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// Find out widest item.
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QSizeF markerMaxSize = maximumMarkerSize();
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// Use max height as scroll button size
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rescaleScrollButtons(QSize(markerMaxSize.height() ,markerMaxSize.height()));
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qreal totalWidth = 0;
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qreal totalHeight = 0;
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qreal yStep = markerMaxSize.height();
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qreal x = m_pos.x() + m_margin;
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qreal y = m_pos.y() + m_margin;
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int row = 1;
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int maxRows = 1;
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qreal scrollButtonHeight = 0;
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// Set correct visibility for scroll scrollbuttons
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if (scrollButtonsVisible()) {
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m_scrollButtonUp->setVisible(true);
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m_scrollButtonDown->setVisible(true);
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totalHeight += (m_scrollButtonUp->boundingRect().height() + m_margin) * 2; // scrollbuttons visible, so add their height to total height
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scrollButtonHeight = m_scrollButtonUp->boundingRect().height();
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y += scrollButtonHeight + m_margin; // start position changes by scrollbutton height
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} else {
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m_scrollButtonUp->setVisible(false);
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m_scrollButtonDown->setVisible(false);
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}
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m_scrollButtonLeft->setVisible(false);
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m_scrollButtonRight->setVisible(false);
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for (int i=0; i < m_markers.count(); i++) {
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LegendMarker* m = m_markers.at(i);
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if (i < mFirstMarker) {
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// Markers before first are not visible.
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m->setVisible(false);
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} else {
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if ((y + yStep + scrollButtonHeight) > (m_pos.y() + m_maximumSize.height())) {
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// This marker would go outside legend rect.
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m->setVisible(false);
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} else {
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// This marker is ok
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m->setVisible(true);
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m->setPos(x, y);
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y += yStep;
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row++;
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}
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}
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maxRows = row;
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}
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m_scrollButtonUp->setPos(m_pos.x() + m_margin, m_pos.y() + m_margin);
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m_scrollButtonDown->setPos(m_pos.x() + m_margin, y + m_margin);
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totalWidth += markerMaxSize.width() + m_margin * 2;
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totalHeight = maxRows * markerMaxSize.height() + m_margin * 4 + scrollButtonHeight; // TODO: check this
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m_size.setWidth(totalWidth);
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m_size.setHeight(totalHeight);
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}
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/*!
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\internal Sets the size of scroll buttons to \a size
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*/
|
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void QLegend::rescaleScrollButtons(const QSize &size)
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{
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QPolygonF left;
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left << QPointF(size.width(), 0) << QPointF(0, size.height() / 2) << QPointF(size.width(), size.height());
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QPolygonF right;
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right << QPointF(0, 0) << QPointF(size.width(), size.height() / 2) << QPointF(0, size.height());
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QPolygonF up;
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up << QPointF(0, size.height()) << QPointF(size.width() / 2,0) << QPointF(size.width(), size.height());
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QPolygonF down;
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down << QPointF(0, 0) << QPointF(size.width() / 2, size.height()) << QPointF(size.width(), 0);
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m_scrollButtonLeft->setPolygon(left);
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m_scrollButtonRight->setPolygon(right);
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m_scrollButtonUp->setPolygon(up);
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m_scrollButtonDown->setPolygon(down);
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}
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/*!
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\internal Finds out maximum size of single marker. Marker sizes depend on series names.
|
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*/
|
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|
QSizeF QLegend::maximumMarkerSize()
|
|
|
{
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|
QSizeF max(0,0);
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foreach (LegendMarker* m, m_markers) {
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if (m->boundingRect().width() > max.width())
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max.setWidth(m->boundingRect().width());
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if (m->boundingRect().height() > max.height())
|
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max.setHeight(m->boundingRect().height());
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}
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return max;
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}
|
|
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|
/*!
|
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|
\internal Checks that first marker is in acceptable bounds. Bounds range from 0 to (maximum number of markers - visible markers)
|
|
|
If scrollbuttons are visible, they affect the number of visible markers.
|
|
|
*/
|
|
|
void QLegend::checkFirstMarkerBounds()
|
|
|
{
|
|
|
if ((m_alignment == QLegend::AlignmentLeft) || (m_alignment == QLegend::AlignmentRight)) {
|
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|
// Bounds limited by height.
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|
int max;
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if (scrollButtonsVisible()) {
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max = (m_maximumSize.height() - m_scrollButtonLeft->boundingRect().height() * 2 - m_margin * 4) / maximumMarkerSize().height();
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} else {
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|
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max = m_maximumSize.height() / maximumMarkerSize().height();
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}
|
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|
|
if (mFirstMarker > m_markers.count() - max)
|
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|
mFirstMarker = m_markers.count() - max;
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|
} else {
|
|
|
// Bounds limited by width
|
|
|
int max;
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|
|
if (scrollButtonsVisible()) {
|
|
|
max = (m_maximumSize.width() - m_scrollButtonLeft->boundingRect().width() * 2 - m_margin*4) / maximumMarkerSize().width();
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|
} else {
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|
|
max = m_maximumSize.width() / maximumMarkerSize().width();
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|
}
|
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|
|
if (mFirstMarker > m_markers.count() - max)
|
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|
mFirstMarker = m_markers.count() - max;
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|
}
|
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|
if (mFirstMarker < 0)
|
|
|
mFirstMarker = 0;
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|
|
}
|
|
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|
|
|
/*!
|
|
|
\internal Helper function. Visibility of scroll buttons isn't quite obvious, so helper function clarifies the logic.
|
|
|
*/
|
|
|
bool QLegend::scrollButtonsVisible()
|
|
|
{
|
|
|
// Just a helper to clarify, what the magic below means :)
|
|
|
if ((m_alignment == QLegend::AlignmentTop) || (m_alignment == QLegend::AlignmentBottom)) {
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return (maximumMarkerSize().width() * m_markers.count() + m_margin * 2 > m_maximumSize.width());
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|
} else if ((m_alignment == QLegend::AlignmentLeft) || (m_alignment == QLegend::AlignmentRight)) {
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|
|
return (maximumMarkerSize().height() * m_markers.count() + m_margin * 2 > m_maximumSize.height());
|
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|
}
|
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|
|
return (maximumMarkerSize().height() * m_markers.count() + m_margin * 2 > m_maximumSize.height());
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|
}
|
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|
#include "moc_qlegend.cpp"
|
|
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|
|
|
QTCOMMERCIALCHART_END_NAMESPACE
|
|
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|
