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/****************************************************************************
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**
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** Copyright (C) 2013 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 Enterprise Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Enterprise licenses may use this file in
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** accordance with the Qt Enterprise 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 "legendlayout_p.h"
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#include "chartpresenter_p.h"
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#include "abstractchartlayout_p.h"
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#include "qlegendmarker.h"
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#include "qlegendmarker_p.h"
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#include "legendmarkeritem_p.h"
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#include "chartdataset_p.h"
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#include <QPainter>
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#include <QPen>
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#include <QGraphicsItemGroup>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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/*!
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\class QLegend
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\inmodule Qt Charts
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\brief Legend object.
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\mainclass
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QLegend is a graphical object for displaying the 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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#ifdef QDOC_QT5
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/*!
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\qmltype Legend
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\instantiates QLegend
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\inqmlmodule QtCommercial.Chart
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\include doc/src/legend.qdocinc
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*/
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#else
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/*!
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\qmlclass Legend QLegend
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\include ../doc/src/legend.qdocinc
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*/
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#endif
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/*!
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\property QLegend::alignment
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\brief The alignment of the legend.
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Legend paints on the defined position in the chart. The following alignments are supported:
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Qt::AlignTop, Qt::AlignBottom, Qt::AlignLeft, Qt::AlignRight. If you set more than one flag the result is undefined.
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*/
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/*!
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\qmlproperty Qt.Alignment Legend::alignment
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\brief The alignment of the legend.
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Legend paints on the defined position in the chart. The following alignments are supported:
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Qt.AlignTop, Qt.AlignBottom, Qt.AlignLeft, Qt.AlignRight. If you set more than one flag the result is undefined.
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*/
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/*!
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\property QLegend::backgroundVisible
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Whether the legend background is visible or not.
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*/
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/*!
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\qmlproperty bool Legend::backgroundVisible
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Whether the legend background is visible or not.
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*/
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/*!
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\property QLegend::color
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The color of the legend, i.e. the background (brush) color. Note that if you change the color
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of the legend, the style of the legend brush is set to Qt::SolidPattern.
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*/
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/*!
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\qmlproperty color Legend::color
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The color of the legend, i.e. the background (brush) color.
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*/
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/*!
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\property QLegend::borderColor
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The border color of the legend, i.e. the line color.
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*/
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/*!
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\qmlproperty color Legend::borderColor
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The border color of the legend, i.e. the line color.
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*/
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/*!
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\property QLegend::font
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The font of markers used by legend
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*/
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/*!
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\qmlproperty Font Legend::font
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The font of markers used by legend
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*/
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/*!
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\property QLegend::labelColor
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The color of brush used to draw labels.
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*/
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/*!
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\qmlproperty color QLegend::labelColor
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The color of brush used to draw labels.
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*/
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/*!
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\property QLegend::reverseMarkers
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Whether reverse order is used for the markers in legend or not. False by default.
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*/
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/*!
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\qmlproperty bool Legend::reverseMarkers
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Whether reverse order is used for the markers in legend or not. False by default.
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*/
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/*!
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\fn void QLegend::backgroundVisibleChanged(bool)
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The visibility of the legend background changed to \a visible.
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*/
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/*!
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\fn void QLegend::colorChanged(QColor)
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The color of the legend background changed to \a color.
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*/
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/*!
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\fn void QLegend::borderColorChanged(QColor)
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The border color of the legend background changed to \a color.
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*/
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/*!
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\fn void QLegend::fontChanged(QFont)
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The font of markers of the legend changed to \a font.
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*/
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/*!
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\fn void QLegend::labelColorChanged(QColor color)
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This signal is emitted when the color of brush used to draw labels has changed to \a color.
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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, chart, this))
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{
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setZValue(ChartPresenter::LegendZValue);
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setFlags(QGraphicsItem::ItemClipsChildrenToShape);
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QObject::connect(chart->d_ptr->m_dataset, SIGNAL(seriesAdded(QAbstractSeries*)), d_ptr.data(), SLOT(handleSeriesAdded(QAbstractSeries*)));
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QObject::connect(chart->d_ptr->m_dataset, SIGNAL(seriesRemoved(QAbstractSeries*)), d_ptr.data(), SLOT(handleSeriesRemoved(QAbstractSeries*)));
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setLayout(d_ptr->m_layout);
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}
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/*!
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Destroys the legend object. Legend is always owned by a QChart, so an application should never call this.
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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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\internal
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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)
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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->drawRoundRect(rect(), d_ptr->roundness(rect().width()), d_ptr->roundness(rect().height()));
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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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emit colorChanged(brush.color());
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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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void QLegend::setColor(QColor color)
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{
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QBrush b = d_ptr->m_brush;
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if (b.style() != Qt::SolidPattern || b.color() != color) {
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b.setStyle(Qt::SolidPattern);
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b.setColor(color);
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setBrush(b);
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}
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}
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QColor QLegend::color()
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{
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return d_ptr->m_brush.color();
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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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emit borderColorChanged(pen.color());
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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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void QLegend::setFont(const QFont &font)
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{
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if (d_ptr->m_font != font) {
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// Hide items to avoid flickering
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d_ptr->items()->setVisible(false);
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d_ptr->m_font = font;
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foreach (QLegendMarker *marker, d_ptr->markers()) {
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marker->setFont(d_ptr->m_font);
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}
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layout()->invalidate();
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emit fontChanged(font);
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}
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}
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QFont QLegend::font() const
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{
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return d_ptr->m_font;
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}
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void QLegend::setBorderColor(QColor color)
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{
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QPen p = d_ptr->m_pen;
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if (p.color() != color) {
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p.setColor(color);
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setPen(p);
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}
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}
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QColor QLegend::borderColor()
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{
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return d_ptr->m_pen.color();
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}
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/*!
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Set brush used to draw labels to \a brush.
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*/
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void QLegend::setLabelBrush(const QBrush &brush)
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{
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if (d_ptr->m_labelBrush != brush) {
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d_ptr->m_labelBrush = brush;
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foreach (QLegendMarker *marker, d_ptr->markers()) {
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marker->setLabelBrush(d_ptr->m_labelBrush);
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// Note: The pen of the marker rectangle could be exposed in the public QLegend API
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// instead of mapping it from label brush color
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marker->setPen(brush.color());
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}
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emit labelColorChanged(brush.color());
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}
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}
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/*!
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Brush used to draw labels.
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*/
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QBrush QLegend::labelBrush() const
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{
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return d_ptr->m_labelBrush;
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}
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void QLegend::setLabelColor(QColor color)
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{
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QBrush b = d_ptr->m_labelBrush;
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if (b.style() != Qt::SolidPattern || b.color() != color) {
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b.setStyle(Qt::SolidPattern);
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b.setColor(color);
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setLabelBrush(b);
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}
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}
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QColor QLegend::labelColor() const
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{
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return d_ptr->m_labelBrush.color();
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}
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void QLegend::setAlignment(Qt::Alignment alignment)
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{
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if (d_ptr->m_alignment != alignment) {
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d_ptr->m_alignment = alignment;
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layout()->invalidate();
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}
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}
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Qt::Alignment 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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// layout()->invalidate();
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d_ptr->m_chart->layout()->invalidate();
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setParent(0);
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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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// layout()->invalidate();
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d_ptr->m_chart->layout()->invalidate();
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setParent(d_ptr->m_chart);
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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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/*!
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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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d_ptr->m_backgroundVisible = visible;
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update();
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emit backgroundVisibleChanged(visible);
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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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Returns the list of markers in legend. The list can be filtered with \a series parameter.
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If \a series is given, only markers related to that series are returned.
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*/
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QList<QLegendMarker*> QLegend::markers(QAbstractSeries *series) const
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{
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return d_ptr->markers(series);
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}
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bool QLegend::reverseMarkers()
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{
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return d_ptr->m_reverseMarkers;
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}
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void QLegend::setReverseMarkers(bool reverseMarkers)
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{
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if (d_ptr->m_reverseMarkers != reverseMarkers) {
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d_ptr->m_reverseMarkers = reverseMarkers;
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layout()->invalidate();
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emit reverseMarkersChanged(reverseMarkers);
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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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if (isAttachedToChart())
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d_ptr->m_presenter->layout()->invalidate();
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QGraphicsWidget::hideEvent(event);
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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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if (isAttachedToChart())
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layout()->invalidate();
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QGraphicsWidget::showEvent(event);
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//layout activation will show the items
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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QLegendPrivate::QLegendPrivate(ChartPresenter *presenter, QChart *chart, QLegend *q)
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: q_ptr(q),
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m_presenter(presenter),
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m_layout(new LegendLayout(q)),
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m_chart(chart),
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m_items(new QGraphicsItemGroup(q)),
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m_alignment(Qt::AlignTop),
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m_brush(QBrush()),
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m_pen(QPen()),
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m_labelBrush(QBrush()),
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m_diameter(5),
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m_attachedToChart(true),
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m_backgroundVisible(false),
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m_reverseMarkers(false)
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{
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m_items->setHandlesChildEvents(false);
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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(const QPointF &offset)
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{
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m_layout->setOffset(offset.x(), offset.y());
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}
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QPointF QLegendPrivate::offset() const
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{
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return m_layout->offset();
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}
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int QLegendPrivate::roundness(qreal size)
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{
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return 100 * m_diameter / int(size);
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}
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QList<QLegendMarker*> QLegendPrivate::markers(QAbstractSeries *series)
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{
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// Return all markers
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if (!series) {
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|
return m_markers;
|
|
|
}
|
|
|
|
|
|
// Create filtered list
|
|
|
QList<QLegendMarker *> markers;
|
|
|
foreach (QLegendMarker *marker, m_markers) {
|
|
|
if (marker->series() == series) {
|
|
|
markers.append(marker);
|
|
|
}
|
|
|
}
|
|
|
return markers;
|
|
|
}
|
|
|
|
|
|
void QLegendPrivate::handleSeriesAdded(QAbstractSeries *series)
|
|
|
{
|
|
|
if (m_series.contains(series)) {
|
|
|
return;
|
|
|
}
|
|
|
|
|
|
QList<QLegendMarker*> newMarkers = series->d_ptr->createLegendMarkers(q_ptr);
|
|
|
decorateMarkers(newMarkers);
|
|
|
addMarkers(newMarkers);
|
|
|
|
|
|
QObject::connect(series->d_ptr.data(), SIGNAL(countChanged()), this, SLOT(handleCountChanged()));
|
|
|
QObject::connect(series, SIGNAL(visibleChanged()), this, SLOT(handleSeriesVisibleChanged()));
|
|
|
|
|
|
m_series.append(series);
|
|
|
m_items->setVisible(false);
|
|
|
m_layout->invalidate();
|
|
|
}
|
|
|
|
|
|
void QLegendPrivate::handleSeriesRemoved(QAbstractSeries *series)
|
|
|
{
|
|
|
if (m_series.contains(series)) {
|
|
|
m_series.removeOne(series);
|
|
|
}
|
|
|
|
|
|
// Find out, which markers to remove
|
|
|
QList<QLegendMarker *> removed;
|
|
|
foreach (QLegendMarker *m, m_markers) {
|
|
|
if (m->series() == series) {
|
|
|
removed << m;
|
|
|
}
|
|
|
}
|
|
|
removeMarkers(removed);
|
|
|
|
|
|
QObject::disconnect(series->d_ptr.data(), SIGNAL(countChanged()), this, SLOT(handleCountChanged()));
|
|
|
QObject::disconnect(series, SIGNAL(visibleChanged()), this, SLOT(handleSeriesVisibleChanged()));
|
|
|
|
|
|
m_layout->invalidate();
|
|
|
}
|
|
|
|
|
|
void QLegendPrivate::handleSeriesVisibleChanged()
|
|
|
{
|
|
|
QAbstractSeries *series = qobject_cast<QAbstractSeries *> (sender());
|
|
|
Q_ASSERT(series);
|
|
|
|
|
|
foreach (QLegendMarker *marker, m_markers) {
|
|
|
if (marker->series() == series) {
|
|
|
marker->setVisible(series->isVisible());
|
|
|
}
|
|
|
}
|
|
|
|
|
|
if (m_chart->isVisible())
|
|
|
m_layout->invalidate();
|
|
|
}
|
|
|
|
|
|
void QLegendPrivate::handleCountChanged()
|
|
|
{
|
|
|
// Here we handle the changes in marker count.
|
|
|
// Can happen for example when pieslice(s) have been added to or removed from pieseries.
|
|
|
|
|
|
QAbstractSeriesPrivate *series = qobject_cast<QAbstractSeriesPrivate *> (sender());
|
|
|
QList<QLegendMarker *> createdMarkers = series->createLegendMarkers(q_ptr);
|
|
|
|
|
|
// Find out removed markers and created markers
|
|
|
QList<QLegendMarker *> removedMarkers;
|
|
|
foreach (QLegendMarker *oldMarker, m_markers) {
|
|
|
// we have marker, which is related to sender.
|
|
|
if (oldMarker->series() == series->q_ptr) {
|
|
|
bool found = false;
|
|
|
foreach(QLegendMarker *newMarker, createdMarkers) {
|
|
|
// New marker considered existing if:
|
|
|
// - d_ptr->relatedObject() is same for both markers.
|
|
|
if (newMarker->d_ptr->relatedObject() == oldMarker->d_ptr->relatedObject()) {
|
|
|
// Delete the new marker, since we already have existing marker, that might be connected on user side.
|
|
|
found = true;
|
|
|
createdMarkers.removeOne(newMarker);
|
|
|
delete newMarker;
|
|
|
}
|
|
|
}
|
|
|
if (!found) {
|
|
|
// No related object found for marker, add to removedMarkers list
|
|
|
removedMarkers << oldMarker;
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
removeMarkers(removedMarkers);
|
|
|
decorateMarkers(createdMarkers);
|
|
|
addMarkers(createdMarkers);
|
|
|
|
|
|
q_ptr->layout()->invalidate();
|
|
|
}
|
|
|
|
|
|
void QLegendPrivate::addMarkers(QList<QLegendMarker *> markers)
|
|
|
{
|
|
|
foreach (QLegendMarker *marker, markers) {
|
|
|
m_items->addToGroup(marker->d_ptr.data()->item());
|
|
|
m_markers << marker;
|
|
|
m_markerHash.insert(marker->d_ptr->item(), marker);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
void QLegendPrivate::removeMarkers(QList<QLegendMarker *> markers)
|
|
|
{
|
|
|
foreach (QLegendMarker *marker, markers) {
|
|
|
marker->d_ptr->item()->setVisible(false);
|
|
|
m_items->removeFromGroup(marker->d_ptr->item());
|
|
|
m_markers.removeOne(marker);
|
|
|
m_markerHash.remove(marker->d_ptr->item());
|
|
|
delete marker;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
void QLegendPrivate::decorateMarkers(QList<QLegendMarker *> markers)
|
|
|
{
|
|
|
foreach (QLegendMarker *marker, markers) {
|
|
|
marker->setFont(m_font);
|
|
|
marker->setLabelBrush(m_labelBrush);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
|
|
|
#include "moc_qlegend.cpp"
|
|
|
#include "moc_qlegend_p.cpp"
|
|
|
|
|
|
QTCOMMERCIALCHART_END_NAMESPACE
|
|
|
|
