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fix: series visible now affects legend items also
fix: series visible now affects legend items also

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r1459:e9693669a76b
r1459:e9693669a76b
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qlegend.cpp
766 lines | 21.6 KiB | text/x-c | CppLexer
/****************************************************************************
**
** Copyright (C) 2012 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the Qt Commercial Charts Add-on.
**
** $QT_BEGIN_LICENSE$
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qlegend.h"
#include "qlegend_p.h"
#include "qabstractseries.h"
#include "qabstractseries_p.h"
#include "qchart_p.h"
#include "legendmarker_p.h"
#include "qxyseries.h"
#include "qlineseries.h"
#include "qareaseries.h"
#include "qscatterseries.h"
#include "qsplineseries.h"
#include "qbarseries.h"
#include "qstackedbarseries.h"
#include "qpercentbarseries.h"
#include "qbarset.h"
#include "qpieseries.h"
#include "qpieseries_p.h"
#include "qpieslice.h"
#include "chartpresenter_p.h"
#include <QPainter>
#include <QPen>
#include <QTimer>
#include <QGraphicsSceneEvent>
QTCOMMERCIALCHART_BEGIN_NAMESPACE
/*!
\class QLegend
\brief part of QtCommercial chart API.
\mainclass
QLegend is a graphical object, whics displays legend of the chart. Legend state is updated by QChart, when
series have been changed. By default, legend is drawn by QChart, but user can set a new parent to legend and
handle the drawing manually.
User isn't supposed to create or delete legend objects, but can reference it via QChart class.
\image examples_percentbarchart_legend.png
\sa QChart
*/
/*!
\qmlclass Legend QLegend
\brief Legend is part of QtCommercial Chart QML API.
Legend is a graphical object, whics displays legend of the chart. Legend state is updated by ChartView, when
series have been changed. Legend is referenced via ChartView class. For example:
\code
ChartView {
legend.visible: true
legend.alignment: Qt.AlignBottom
// Add a few series...
}
\endcode
\image examples_percentbarchart_legend.png
*/
/*!
\property QLegend::alignment
\brief The alignment of the legend.
Legend paints on the defined position in the chart. The following alignments are supported:
Qt::AlignTop, Qt::AlignBottom, Qt::AlignLeft, Qt::AlignRight. If you set more than one flag the result is undefined.
*/
/*!
\qmlproperty Qt.Alignment Legend::alignment
\brief The alignment of the legend.
Legend paints on the defined position in the chart. The following alignments are supported:
Qt.AlignTop, Qt.AlignBottom, Qt.AlignLeft, Qt.AlignRight. If you set more than one flag the result is undefined.
*/
/*!
\property QLegend::backgroundVisible
Whether the legend background is visible or not.
*/
/*!
\qmlproperty bool Legend::backgroundVisible
Whether the legend background is visible or not.
*/
/*!
\property QLegend::color
The color of the legend, i.e. the background color.
*/
/*!
\qmlproperty color Legend::color
The color of the legend, i.e. the background color.
*/
/*!
\property QLegend::borderColor
The border color of the legend, i.e. the line color.
*/
/*!
\qmlproperty color Legend::borderColor
The border color of the legend, i.e. the line color.
*/
/*!
\fn void QLegend::alignmentChanged(Qt::Alignment)
Emitted when the \a alignment of the legend changes.
*/
/*!
\fn void QLegend::backgroundVisibleChanged(bool)
The visibility of the legend background changed to \a visible.
*/
/*!
\fn void QLegend::colorChanged(QColor)
The color of the legend background changed to \a color.
*/
/*!
\fn void QLegend::borderColorChanged(QColor)
The border color of the legend background changed to \a color.
*/
/*!
\fn qreal QLegend::minWidth() const
Returns minimum width of the legend
*/
/*!
\fn qreal QLegend::minHeight() const
Returns minimum height of the legend
*/
/*!
Constructs the legend object and sets the parent to \a parent
*/
QLegend::QLegend(QChart *chart):QGraphicsWidget(chart),
d_ptr(new QLegendPrivate(chart->d_ptr->m_presenter,chart,this))
{
setZValue(ChartPresenter::LegendZValue);
setFlags(QGraphicsItem::ItemClipsChildrenToShape);
QObject::connect(chart->d_ptr->m_dataset,SIGNAL(seriesAdded(QAbstractSeries*,Domain*)),d_ptr.data(),SLOT(handleSeriesAdded(QAbstractSeries*,Domain*)));
QObject::connect(chart->d_ptr->m_dataset,SIGNAL(seriesRemoved(QAbstractSeries*)),d_ptr.data(),SLOT(handleSeriesRemoved(QAbstractSeries*)));
QObject::connect(chart->d_ptr->m_dataset,SIGNAL(seriesUpdated(QAbstractSeries*)),d_ptr.data(),SLOT(handleSeriesUpdated(QAbstractSeries*)));
}
/*!
Destroys the legend object. Legend is always owned by a QChart, so an application should never call this.
*/
QLegend::~QLegend()
{
}
/*!
Paints the legend to given \a painter. Paremeters \a option and \a widget arent used.
*/
void QLegend::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
Q_UNUSED(option)
Q_UNUSED(widget)
if(!d_ptr->m_backgroundVisible) return;
painter->setOpacity(opacity());
painter->setPen(d_ptr->m_pen);
painter->setBrush(d_ptr->m_brush);
painter->drawRoundRect(rect(),d_ptr->roundness(rect().width()),d_ptr->roundness(rect().height()));
}
/*!
Bounding rect of legend.
*/
QRectF QLegend::boundingRect() const
{
return d_ptr->m_rect;
}
/*!
Sets the \a brush of legend. Brush affects the background of legend.
*/
void QLegend::setBrush(const QBrush &brush)
{
if (d_ptr->m_brush != brush) {
d_ptr->m_brush = brush;
update();
}
}
/*!
Returns the brush used by legend.
*/
QBrush QLegend::brush() const
{
return d_ptr->m_brush;
}
void QLegend::setColor(QColor color)
{
QBrush b = d_ptr->m_brush;
if (b.color() != color) {
b.setColor(color);
setBrush(b);
emit colorChanged(color);
}
}
QColor QLegend::color()
{
return d_ptr->m_brush.color();
}
/*!
Sets the \a pen of legend. Pen affects the legend borders.
*/
void QLegend::setPen(const QPen &pen)
{
if (d_ptr->m_pen != pen) {
d_ptr->m_pen = pen;
update();
}
}
/*!
Returns the pen used by legend
*/
QPen QLegend::pen() const
{
return d_ptr->m_pen;
}
void QLegend::setBorderColor(QColor color)
{
QPen p = d_ptr->m_pen;
if (p.color() != color) {
p.setColor(color);
setPen(p);
emit borderColorChanged(color);
}
}
QColor QLegend::borderColor()
{
return d_ptr->m_pen.color();
}
void QLegend::setAlignment(Qt::Alignment alignment)
{
if(d_ptr->m_alignment!=alignment) {
d_ptr->m_alignment = alignment;
d_ptr->updateLayout();
alignmentChanged(alignment);
}
}
Qt::Alignment QLegend::alignment() const
{
return d_ptr->m_alignment;
}
/*!
Detaches the legend from chart. Chart won't change layout of the legend.
*/
void QLegend::detachFromChart()
{
d_ptr->m_attachedToChart = false;
}
/*!
Attaches the legend to chart. Chart may change layout of the legend.
*/
void QLegend::attachToChart()
{
d_ptr->attachToChart();
}
/*!
Returns true, if legend is attached to chart.
*/
bool QLegend::isAttachedToChart()
{
return d_ptr->m_attachedToChart;
}
/*!
Sets the visibility of legend background to \a visible
*/
void QLegend::setBackgroundVisible(bool visible)
{
if(d_ptr->m_backgroundVisible != visible) {
d_ptr->m_backgroundVisible = visible;
update();
emit backgroundVisibleChanged(visible);
}
}
/*!
Returns the visibility of legend background
*/
bool QLegend::isBackgroundVisible() const
{
return d_ptr->m_backgroundVisible;
}
/*!
\internal \a event see QGraphicsWidget for details
*/
void QLegend::resizeEvent(QGraphicsSceneResizeEvent *event)
{
const QRectF& rect = QRectF(QPoint(0,0),event->newSize());
QGraphicsWidget::resizeEvent(event);
if(d_ptr->m_rect != rect) {
d_ptr->m_rect = rect;
d_ptr->updateLayout();
}
}
/*!
\internal \a event see QGraphicsWidget for details
*/
void QLegend::hideEvent(QHideEvent *event)
{
QGraphicsWidget::hideEvent(event);
setEnabled(false);
d_ptr->updateLayout();
}
/*!
\internal \a event see QGraphicsWidget for details
*/
void QLegend::showEvent(QShowEvent *event)
{
QGraphicsWidget::showEvent(event);
setEnabled(true);
d_ptr->updateLayout();
}
qreal QLegend::minWidth() const
{
return d_ptr->m_minWidth;
}
qreal QLegend::minHeight() const
{
return d_ptr->m_minHeight;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
QLegendPrivate::QLegendPrivate(ChartPresenter* presenter, QChart *chart, QLegend *q):
q_ptr(q),
m_presenter(presenter),
m_chart(chart),
m_markers(new QGraphicsItemGroup(q)),
m_alignment(Qt::AlignTop),
m_brush(QBrush()),
m_pen(QPen()),
m_offsetX(0),
m_offsetY(0),
m_minWidth(0),
m_minHeight(0),
m_width(0),
m_height(0),
m_diameter(5),
m_attachedToChart(true),
m_backgroundVisible(false)
{
}
QLegendPrivate::~QLegendPrivate()
{
}
void QLegendPrivate::setOffset(qreal x, qreal y)
{
bool scrollHorizontal = true;
switch(m_alignment) {
case Qt::AlignTop:
case Qt::AlignBottom: {
scrollHorizontal = true;
break;
}
case Qt::AlignLeft:
case Qt::AlignRight: {
scrollHorizontal = false;
break;
}
}
// If detached, the scrolling direction is vertical instead of horizontal and vice versa.
if (!m_attachedToChart) {
scrollHorizontal = !scrollHorizontal;
}
// Limit offset between m_minOffset and m_maxOffset
if (scrollHorizontal) {
if(m_width<=m_rect.width()) return;
if (x != m_offsetX) {
m_offsetX = qBound(m_minOffsetX, x, m_maxOffsetX);
m_markers->setPos(-m_offsetX,m_rect.top());
}
} else {
if(m_height<=m_rect.height()) return;
if (y != m_offsetY) {
m_offsetY = qBound(m_minOffsetY, y, m_maxOffsetY);
m_markers->setPos(m_rect.left(),-m_offsetY);
}
}
}
QPointF QLegendPrivate::offset() const
{
return QPointF(m_offsetX,m_offsetY);
}
void QLegendPrivate::updateLayout()
{
if (!m_attachedToChart) {
updateDetachedLayout();
return;
}
m_offsetX=0;
QList<QGraphicsItem *> items = m_markers->childItems();
if(items.isEmpty()) return;
m_minWidth=0;
m_minHeight=0;
switch(m_alignment) {
case Qt::AlignTop:
case Qt::AlignBottom: {
QPointF point = m_rect.topLeft();
m_width = 0;
foreach (QGraphicsItem *item, items) {
if (item->isVisible()) {
item->setPos(point.x(),m_rect.height()/2 -item->boundingRect().height()/2);
const QRectF& rect = item->boundingRect();
qreal w = rect.width();
m_minWidth=qMax(m_minWidth,w);
m_minHeight=qMax(m_minHeight,rect.height());
m_width+=w;
point.setX(point.x() + w);
}
}
if(m_width<m_rect.width()) {
m_markers->setPos(m_rect.width()/2-m_width/2,m_rect.top());
}
else {
m_markers->setPos(m_rect.topLeft());
}
m_height=m_minHeight;
}
break;
case Qt::AlignLeft:
case Qt::AlignRight: {
QPointF point = m_rect.topLeft();
m_height = 0;
foreach (QGraphicsItem *item, items) {
if (item->isVisible()) {
item->setPos(point);
const QRectF& rect = item->boundingRect();
qreal h = rect.height();
m_minWidth=qMax(m_minWidth,rect.width());
m_minHeight=qMax(m_minHeight,h);
m_height+=h;
point.setY(point.y() + h);
}
}
if(m_height<m_rect.height()) {
m_markers->setPos(m_rect.left(),m_rect.height()/2-m_height/2);
}
else {
m_markers->setPos(m_rect.topLeft());
}
m_width=m_minWidth;
}
break;
}
m_minOffsetX = 0;
m_minOffsetY = 0;
m_maxOffsetX = m_width - m_rect.width();
m_maxOffsetY = m_height - m_rect.height();
m_presenter->updateLayout();
}
void QLegendPrivate::updateDetachedLayout()
{
// Detached layout is different.
// In detached mode legend may have multiple rows and columns, so layout calculations
// differ a log from attached mode.
// Also the scrolling logic is bit different.
m_offsetX=0;
m_offsetY=0;
QList<QGraphicsItem *> items = m_markers->childItems();
if(items.isEmpty()) return;
m_minWidth = 0;
m_minHeight = 0;
switch (m_alignment) {
case Qt::AlignTop: {
QPointF point = m_rect.topLeft();
m_width = 0;
m_height = 0;
for (int i=0; i<items.count(); i++) {
QGraphicsItem *item = items.at(i);
if (item->isVisible()) {
const QRectF& rect = item->boundingRect();
qreal w = rect.width();
qreal h = rect.height();
m_minWidth = qMax(m_minWidth,w);
m_minHeight = qMax(m_minHeight,rect.height());
m_height = qMax(m_height,h);
item->setPos(point.x(),point.y());
point.setX(point.x() + w);
if (point.x() + w > m_rect.topLeft().x() + m_rect.width()) {
// Next item would go off rect.
point.setX(m_rect.topLeft().x());
point.setY(point.y() + h);
if (i+1 < items.count()) {
m_height += h;
}
}
}
}
m_markers->setPos(m_rect.topLeft());
m_width = m_minWidth;
m_minOffsetX = 0;
m_minOffsetY = 0;
m_maxOffsetX = m_width - m_rect.width();
m_maxOffsetY = m_height - m_rect.height();
}
break;
case Qt::AlignBottom: {
QPointF point = m_rect.bottomLeft();
m_width = 0;
m_height = 0;
for (int i=0; i<items.count(); i++) {
QGraphicsItem *item = items.at(i);
if (item->isVisible()) {
const QRectF& rect = item->boundingRect();
qreal w = rect.width();
qreal h = rect.height();
m_minWidth = qMax(m_minWidth,w);
m_minHeight = qMax(m_minHeight,rect.height());
m_height = qMax(m_height,h);
item->setPos(point.x(),point.y() - h);
point.setX(point.x() + w);
if (point.x() + w > m_rect.bottomLeft().x() + m_rect.width()) {
// Next item would go off rect.
point.setX(m_rect.bottomLeft().x());
point.setY(point.y() - h);
if (i+1 < items.count()) {
m_height += h;
}
}
}
}
m_markers->setPos(m_rect.topLeft());
m_width = m_minWidth;
m_minOffsetX = 0;
m_minOffsetY = qMin(m_rect.topLeft().y(), m_rect.topLeft().y() - m_height + m_rect.height());
m_maxOffsetX = m_width - m_rect.width();
m_maxOffsetY = 0;
}
break;
case Qt::AlignLeft: {
QPointF point = m_rect.topLeft();
m_width = 0;
m_height = 0;
qreal maxWidth = 0;
for (int i=0; i<items.count(); i++) {
QGraphicsItem *item = items.at(i);
if (item->isVisible()) {
const QRectF& rect = item->boundingRect();
qreal w = rect.width();
qreal h = rect.height();
m_minWidth = qMax(m_minWidth,rect.width());
m_minHeight = qMax(m_minHeight,h);
maxWidth = qMax(maxWidth,w);
item->setPos(point.x(),point.y());
point.setY(point.y() + h);
if (point.y() + h > m_rect.topLeft().y() + m_rect.height()) {
// Next item would go off rect.
point.setX(point.x() + maxWidth);
point.setY(m_rect.topLeft().y());
if (i+1 < items.count()) {
m_width += maxWidth;
maxWidth = 0;
}
}
}
}
m_width += maxWidth;
m_markers->setPos(m_rect.topLeft());
m_height = m_minHeight;
m_minOffsetX = 0;
m_minOffsetY = 0;
m_maxOffsetX = m_width - m_rect.width();
m_maxOffsetY = m_height - m_rect.height();
}
break;
case Qt::AlignRight: {
QPointF point = m_rect.topRight();
m_width = 0;
m_height = 0;
qreal maxWidth = 0;
for (int i=0; i<items.count(); i++) {
QGraphicsItem *item = items.at(i);
if (item->isVisible()) {
const QRectF& rect = item->boundingRect();
qreal w = rect.width();
qreal h = rect.height();
m_minWidth = qMax(m_minWidth,rect.width());
m_minHeight = qMax(m_minHeight,h);
maxWidth = qMax(maxWidth,w);
item->setPos(point.x() - w,point.y());
point.setY(point.y() + h);
if (point.y() + h > m_rect.topLeft().y() + m_rect.height()) {
// Next item would go off rect.
point.setX(point.x() - maxWidth);
point.setY(m_rect.topLeft().y());
if (i+1 < items.count()) {
m_width += maxWidth;
maxWidth = 0;
}
}
}
}
m_width += maxWidth;
m_markers->setPos(m_rect.topLeft());
m_height = m_minHeight;
m_minOffsetX = qMin(m_rect.topLeft().x(), m_rect.topLeft().x() - m_width + m_rect.width());
m_minOffsetY = 0;
m_maxOffsetX = 0;
m_maxOffsetY = m_height - m_rect.height();
}
break;
default:
break;
}
}
void QLegendPrivate::attachToChart()
{
m_attachedToChart = true;
q_ptr->setParent(m_chart);
}
int QLegendPrivate::roundness(qreal size)
{
return 100*m_diameter/int(size);
}
void QLegendPrivate::handleSeriesAdded(QAbstractSeries *series, Domain *domain)
{
Q_UNUSED(domain)
QList<LegendMarker*> markers = series->d_ptr->createLegendMarker(q_ptr);
foreach(LegendMarker* marker, markers)
m_markers->addToGroup(marker);
QObject::connect(series, SIGNAL(visibleChanged()), this, SLOT(handleSeriesVisibleChanged()));
if(series->type() == QAbstractSeries::SeriesTypePie) {
QPieSeries *pieSeries = static_cast<QPieSeries *>(series);
QObject::connect(pieSeries, SIGNAL(added(QList<QPieSlice*>)), this, SLOT(handleUpdatePieSeries()));
QObject::connect(pieSeries, SIGNAL(removed(QList<QPieSlice*>)), this, SLOT(handleUpdatePieSeries()));
}
updateLayout();
}
void QLegendPrivate::handleSeriesRemoved(QAbstractSeries *series)
{
QList<QGraphicsItem *> items = m_markers->childItems();
foreach (QGraphicsItem *markers, items) {
LegendMarker *marker = static_cast<LegendMarker*>(markers);
if (marker->series() == series) {
delete marker;
}
}
if(series->type() == QAbstractSeries::SeriesTypePie)
{
QPieSeries *pieSeries = static_cast<QPieSeries *>(series);
QObject::disconnect(pieSeries, SIGNAL(added(QList<QPieSlice*>)), this, SLOT(handleUpdatePieSeries()));
QObject::disconnect(pieSeries, SIGNAL(removed(QList<QPieSlice*>)), this, SLOT(handleUpdatePieSeries()));
}
updateLayout();
}
void QLegendPrivate::handleSeriesUpdated(QAbstractSeries *series)
{
// TODO: find out which markers are are added or removed. Update them
// TODO: better implementation
handleSeriesRemoved(series);
Domain domain;
handleSeriesAdded(series, &domain);
}
void QLegendPrivate::handleUpdatePieSeries()
{
//TODO: reimplement to be optimal
QPieSeries* series = qobject_cast<QPieSeries *> (sender());
Q_ASSERT(series);
handleSeriesRemoved(series);
handleSeriesAdded(series, 0);
}
void QLegendPrivate::handleSeriesVisibleChanged()
{
QAbstractSeries* series = qobject_cast<QAbstractSeries *> (sender());
QList<QGraphicsItem *> items = m_markers->childItems();
foreach (QGraphicsItem *markers, items) {
LegendMarker *marker = static_cast<LegendMarker*>(markers);
if (marker->series() == series) {
marker->setVisible(!marker->isVisible());
}
}
updateLayout();
}
#include "moc_qlegend.cpp"
#include "moc_qlegend_p.cpp"
QTCOMMERCIALCHART_END_NAMESPACE