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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 "qlegend_p.h"
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#include "qabstractseries.h"
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#include "qabstractseries_p.h"
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#include "qchart_p.h"
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#include "legendmarker_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 <QTimer>
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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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\mainclass
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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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\image examples_percentbarchart_legend.png
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\sa QChart
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*/
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/*!
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\enum QLegend::Alignment
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This enum describes the possible position for legend inside chart.
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\value AlignmentTop
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\value AlignmentBottom
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\value AlignmentLeft
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\value AlignmentRight
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*/
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/*!
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\fn qreal QLegend::minWidth() const
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Returns minimum width of the legend
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*/
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/*!
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\fn qreal QLegend::minHeight() const
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Returns minimum height of the legend
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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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d_ptr(new QLegendPrivate(chart->d_ptr->m_presenter,this))
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{
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setZValue(ChartPresenter::LegendZValue);
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setFlags(QGraphicsItem::ItemClipsChildrenToShape);
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setEnabled(false); // By default legend is disabled
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setVisible(false);
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QObject::connect(chart->d_ptr->m_dataset,SIGNAL(seriesAdded(QAbstractSeries *, Domain *)),d_ptr.data(),SLOT(handleSeriesAdded(QAbstractSeries *,Domain*)));
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QObject::connect(chart->d_ptr->m_dataset,SIGNAL(seriesRemoved(QAbstractSeries *)),d_ptr.data(),SLOT(handleSeriesRemoved(QAbstractSeries *)));
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}
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QLegend::~QLegend()
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{
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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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if(!d_ptr->m_backgroundVisible) return;
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painter->setOpacity(opacity());
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painter->setPen(d_ptr->m_pen);
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painter->setBrush(d_ptr->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 d_ptr->m_rect;
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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 (d_ptr->m_brush != brush) {
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d_ptr->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 d_ptr->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 (d_ptr->m_pen != pen) {
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d_ptr->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 d_ptr->m_pen;
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}
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/*!
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Sets the \a alignment for legend. Legend tries to paint itself on the defined position in chart.
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\sa QLegend::Alignment
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*/
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void QLegend::setAlignment(QLegend::Alignments alignment)
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{
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if(d_ptr->m_alignment!=alignment && d_ptr->m_attachedToChart) {
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d_ptr->m_alignment = alignment;
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d_ptr->updateLayout();
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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 d_ptr->m_alignment;
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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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d_ptr->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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d_ptr->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::isAttachedToChart()
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{
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return d_ptr->m_attachedToChart;
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}
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void QLegend::setOffset(const QPointF& point)
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{
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d_ptr->setOffset(point.x(),point.y());
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}
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QPointF QLegend::offset() const
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{
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return QPointF(d_ptr->m_offsetX,d_ptr->m_offsetY);
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}
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/*!
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Sets the visibility of legend background to \a visible
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*/
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void QLegend::setBackgroundVisible(bool visible)
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{
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if(d_ptr->m_backgroundVisible!=visible)
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{
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d_ptr->m_backgroundVisible=visible;
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update();
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}
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}
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/*!
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Returns the visibility of legend background
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*/
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bool QLegend::isBackgroundVisible() const
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{
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return d_ptr->m_backgroundVisible;
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}
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/*!
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\internal \a event see QGraphicsWidget for details
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*/
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void QLegend::resizeEvent(QGraphicsSceneResizeEvent *event)
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{
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const QRectF& rect = QRectF(QPoint(0,0),event->newSize());
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QGraphicsWidget::resizeEvent(event);
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if(d_ptr->m_rect != rect) {
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d_ptr->m_rect = rect;
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d_ptr->updateLayout();
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}
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}
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/*!
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\internal \a event see QGraphicsWidget for details
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*/
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void QLegend::hideEvent(QHideEvent *event)
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{
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QGraphicsWidget::hideEvent(event);
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setEnabled(false);
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d_ptr->updateLayout();
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}
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/*!
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\internal \a event see QGraphicsWidget for details
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*/
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void QLegend::showEvent(QShowEvent *event)
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{
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QGraphicsWidget::showEvent(event);
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setEnabled(true);
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d_ptr->updateLayout();
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}
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qreal QLegend::minWidth() const
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{
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return d_ptr->m_minWidth;
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}
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qreal QLegend::minHeight() const
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{
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return d_ptr->m_minHeight;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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QLegendPrivate::QLegendPrivate(ChartPresenter* presenter,QLegend *q):
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q_ptr(q),
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m_presenter(presenter),
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m_markers(new QGraphicsItemGroup(q)),
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m_alignment(QLegend::AlignmentTop),
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m_offsetX(0),
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m_offsetY(0),
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m_minWidth(0),
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m_minHeight(0),
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m_width(0),
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m_height(0),
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m_attachedToChart(true),
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m_backgroundVisible(false)
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{
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}
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QLegendPrivate::~QLegendPrivate()
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{
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}
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void QLegendPrivate::setOffset(qreal x, qreal y)
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{
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switch(m_alignment) {
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case QLegend::AlignmentTop:
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case QLegend::AlignmentBottom: {
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if(m_width<=m_rect.width()) return;
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if (x != m_offsetX) {
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m_offsetX = qBound(qreal(0), x, m_width - m_rect.width());
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m_markers->setPos(-m_offsetX,m_rect.top());
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}
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break;
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}
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case QLegend::AlignmentLeft:
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case QLegend::AlignmentRight: {
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if(m_height<=m_rect.height()) return;
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if (y != m_offsetY) {
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m_offsetY = qBound(qreal(0), y, m_height - m_rect.height());
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m_markers->setPos(m_rect.left(),-m_offsetY);
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}
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break;
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}
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}
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}
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void QLegendPrivate::updateLayout()
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{
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m_offsetX=0;
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QList<QGraphicsItem *> items = m_markers->childItems();
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if(items.isEmpty()) return;
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m_minWidth=0;
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m_minHeight=0;
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switch(m_alignment) {
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case QLegend::AlignmentTop:
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case QLegend::AlignmentBottom: {
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QPointF point = m_rect.topLeft();
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m_width = 0;
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foreach (QGraphicsItem *item, items) {
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item->setPos(point.x(),m_rect.height()/2 -item->boundingRect().height()/2);
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const QRectF& rect = item->boundingRect();
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qreal w = rect.width();
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m_minWidth=qMax(m_minWidth,w);
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m_minHeight=qMax(m_minHeight,rect.height());
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m_width+=w;
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point.setX(point.x() + w);
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}
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if(m_width<m_rect.width()) {
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m_markers->setPos(m_rect.width()/2-m_width/2,m_rect.top());
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}
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else {
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m_markers->setPos(m_rect.topLeft());
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}
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m_height=m_minHeight;
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}
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break;
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case QLegend::AlignmentLeft:
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case QLegend::AlignmentRight: {
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QPointF point = m_rect.topLeft();
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m_height = 0;
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foreach (QGraphicsItem *item, items) {
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item->setPos(point);
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const QRectF& rect = item->boundingRect();
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qreal h = rect.height();
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m_minWidth=qMax(m_minWidth,rect.width());
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m_minHeight=qMax(m_minHeight,h);
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m_height+=h;
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point.setY(point.y() + h);
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}
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if(m_height<m_rect.height()) {
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m_markers->setPos(m_rect.left(),m_rect.height()/2-m_height/2);
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}
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else {
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m_markers->setPos(m_rect.topLeft());
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}
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m_width=m_minWidth;
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}
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break;
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}
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m_presenter->updateLayout();
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}
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void QLegendPrivate::handleSeriesAdded(QAbstractSeries *series, Domain *domain)
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{
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Q_UNUSED(domain)
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QList<LegendMarker*> markers = series->d_ptr->createLegendMarker(q_ptr);
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foreach(LegendMarker* marker , markers)
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m_markers->addToGroup(marker);
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if(series->type() == QAbstractSeries::SeriesTypePie)
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{
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QPieSeries *pieSeries = static_cast<QPieSeries *>(series);
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QObject::connect(pieSeries,SIGNAL(added(QList<QPieSlice*>)),this,SLOT(handleUpdateSeries()));
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QObject::connect(pieSeries,SIGNAL(removed(QList<QPieSlice*>)),this,SLOT(handleUpdateSeries()));
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}
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updateLayout();
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}
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void QLegendPrivate::handleSeriesRemoved(QAbstractSeries *series)
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{
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QList<QGraphicsItem *> items = m_markers->childItems();
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foreach (QGraphicsItem *markers, items) {
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LegendMarker *marker = static_cast<LegendMarker*>(markers);
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if (marker->series() == series) {
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delete marker;
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}
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}
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if(series->type() == QAbstractSeries::SeriesTypePie)
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{
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QPieSeries *pieSeries = static_cast<QPieSeries *>(series);
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QObject::disconnect(pieSeries,SIGNAL(added(QList<QPieSlice*>)),this,SLOT(handleUpdateSeries()));
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QObject::disconnect(pieSeries,SIGNAL(removed(QList<QPieSlice*>)),this,SLOT(handleUpdateSeries()));
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}
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updateLayout();
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}
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void QLegendPrivate::handleUpdateSeries()
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{
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//TODO: reimplement to be optimal
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QAbstractSeries* series = qobject_cast<QAbstractSeries *> (sender());
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Q_ASSERT(series);
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handleSeriesRemoved(series);
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handleSeriesAdded(series,0);
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}
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#include "moc_qlegend.cpp"
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#include "moc_qlegend_p.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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