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legend example to documentation. minor legend fixes
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@@ -0,0 +1,29
1 /*!
2 \example examples/legend
3 \title Legend Example
4 \subtitle
5
6 This example shows how to detach legend from chart and how to attach it back. By default the chart
7 draws the legend inside same view with the chart. In some cases user may want to draw legend to somewhere else. To make this possible the legend can be detached from the chart. Detaching means that chart doesn't draw the legend or try to change it's layout. Detached can then be drawn where user wants, for example in different graphics scene. In this example we do so.
8
9 First we create our chart as usual.
10
11 \snippet ../examples/legend/mainwidget.cpp 1
12
13 Here we create custom graphics scene, where we want to draw the detached legend.
14
15 \snippet ../examples/legend/mainwidget.cpp 2
16
17 Add some series to the chart.
18
19 \snippet ../examples/legend/mainwidget.cpp 3
20
21 Here we detach the legend. After detaching, we set new geometry for it and add it to the custom scene. The custom scene adopts the legend and becomes new parent for it. Note that chart will still update the contents of the legend.
22
23 \snippet ../examples/legend/mainwidget.cpp 4
24
25 To attach legend back to chart we first remove it from the custom scene. Then we add legend to the scene, where chart is. Last we attach legend to chart. Attaching legend to chart automatically sets the QChart as parent for legend.
26
27 \snippet ../examples/legend/mainwidget.cpp 5
28
29 */
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@@ -17,6 +17,7
17 17 <li><a href="examples-barchart.html">Bar chart</a></li>
18 18 <li><a href="examples-customchart.html">Custom chart</a></li>
19 19 <li><a href="examples-groupedbarchart.html">Grouped bar chart</a></li>
20 <li><a href="examples-legend.html">Legend</a></li>
20 21 <li><a href="examples-linechart.html">Line chart</a></li>
21 22 <li><a href="examples-modeldata.html">Model data</a></li>
22 23 <li><a href="examples-percentbarchart.html">Percent bar chart</a></li>
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@@ -13,10 +13,7 QTCOMMERCIALCHART_USE_NAMESPACE
13 13 MainWidget::MainWidget(QWidget *parent) :
14 14 QWidget(parent)
15 15 {
16 m_setCount = 0;
17 m_chart = new QChart();
18
19 //![1]
16 // Create buttons for ui
20 17 m_buttonLayout = new QGridLayout();
21 18 QPushButton *detachLegendButton = new QPushButton("detach legend");
22 19 connect(detachLegendButton, SIGNAL(clicked()), this, SLOT(detachLegend()));
@@ -31,12 +28,15 MainWidget::MainWidget(QWidget *parent) :
31 28 QPushButton *removeBarsetButton = new QPushButton("remove barset");
32 29 connect(removeBarsetButton, SIGNAL(clicked()), this, SLOT(removeBarset()));
33 30 m_buttonLayout->addWidget(removeBarsetButton, 3, 0);
34 //![1]
35 31
36 32 // Create chart view with the chart
33 //![1]
34 m_chart = new QChart();
37 35 m_chartView = new QChartView(m_chart, this);
38 36 m_chartView->setRubberBand(QChartView::HorizonalRubberBand);
37 //![1]
39 38
39 // Create custom scene and view, where detached legend will be drawn
40 40 //![2]
41 41 m_customView = new QGraphicsView(this);
42 42 m_customScene = new QGraphicsScene(this);
@@ -55,6 +55,7 MainWidget::MainWidget(QWidget *parent) :
55 55
56 56 void MainWidget::createSeries()
57 57 {
58 //![3]
58 59 m_series = new QBarSeries();
59 60 addBarset();
60 61 addBarset();
@@ -69,54 +70,51 void MainWidget::createSeries()
69 70 m_chart->axisY()->setNiceNumbersEnabled(true);
70 71
71 72 m_chartView->setRenderHint(QPainter::Antialiasing);
73 //![3]
72 74 }
73 75
74 76 void MainWidget::detachLegend()
75 77 {
76 //![3]
77 // Detach legend from chart
78 // Detach legend from chart and
79 // put legend to our custom scene
80 //![4]
78 81 QLegend *legend = m_chart->legend();
79 82 legend->detachFromChart();
80 83 legend->setGeometry(m_customView->rect());
81 // legend->setAlignment(QLegend::AlignmentLeft);
82
83 // Put legend to our custom scene
84 84 m_customScene->addItem(legend);
85 //![3]
85 //![4]
86 86
87 // This causes redraw
88 QSize size(1,1);
89 this->resize(this->size() + size);
90 this->resize(this->size() - size);
87 // This forces redraw
88 QSize delta(1,1);
89 resize(size() + delta);
90 resize(size() - delta);
91 91 }
92 92
93 93
94 94 void MainWidget::attachLegend()
95 95 {
96 //![4]
96 // Remove legend from custom scene and put it back to chartview scene.
97 // Attach legend back to chart, so that layout works.
98
99 //![5]
97 100 QLegend *legend = m_chart->legend();
98 101
99 102 if (m_customScene->items().contains(legend)) {
100 // Remove legend from custom scene and put it back to chartview scene.
101 // Attach legend back to chart, so that layout works.
102 103 m_customScene->removeItem(legend);
103 legend->setParent(m_chart);
104 104 m_chartView->scene()->addItem(legend);
105 // legend->setAlignment(QLegend::AlignmentBottom);
106 105 legend->attachToChart();
107 106 }
108 //![4]
107 //![5]
109 108
110 // This causes redraw
111 QSize size(1,1);
112 this->resize(this->size() + size);
113 this->resize(this->size() - size);
109 // This forces redraw
110 QSize delta(1,1);
111 resize(size() + delta);
112 resize(size() - delta);
114 113 }
115 114
116 115 void MainWidget::addBarset()
117 116 {
118 QBarSet *barSet = new QBarSet(QString("set ") + QString::number(m_setCount));
119 m_setCount++;
117 QBarSet *barSet = new QBarSet(QString("set ") + QString::number(m_series->barsetCount()));
120 118 qreal delta = m_series->barsetCount() * 0.1;
121 119 *barSet << QPointF(0.0 + delta, 1 + delta) << QPointF(1.0 + delta, 2 + delta) << QPointF(2.0 + delta, 3 + delta) << QPointF(3.0 + delta, 4 + delta);
122 120 m_series->append(barSet);
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@@ -33,17 +33,12 private:
33 33 QChart *m_chart;
34 34 QBarSeries *m_series;
35 35
36 QGraphicsScene *m_scene;
37 36 QChartView *m_chartView;
38 37 QGridLayout *m_mainLayout;
39 38 QGridLayout *m_buttonLayout;
40 39
41 40 QGraphicsView *m_customView;
42 41 QGraphicsScene *m_customScene;
43 QGraphicsGridLayout *m_customLayout;
44
45
46 int m_setCount;
47 42 };
48 43
49 44 #endif // MAINWIDGET_H
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@@ -316,7 +316,7 void ChartPresenter::updateLayout()
316 316 QLegend* legend = m_chart->d_ptr->m_legend;
317 317
318 318 // recalculate legend position
319 if (legend->isAttachedToChart() && legend->isEnabled()) {
319 if (legend != 0 && legend->isAttachedToChart() && legend->isEnabled()) {
320 320
321 321 QRect legendRect;
322 322
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@@ -87,7 +87,7 QTCOMMERCIALCHART_BEGIN_NAMESPACE
87 87 */
88 88
89 89 QLegend::QLegend(QChart *chart):QGraphicsWidget(chart),
90 d_ptr(new QLegendPrivate(chart->d_ptr->m_presenter,this))
90 d_ptr(new QLegendPrivate(chart->d_ptr->m_presenter,chart,this))
91 91 {
92 92 setZValue(ChartPresenter::LegendZValue);
93 93 setFlags(QGraphicsItem::ItemClipsChildrenToShape);
@@ -200,7 +200,7 void QLegend::detachFromChart()
200 200 */
201 201 void QLegend::attachToChart()
202 202 {
203 d_ptr->m_attachedToChart = true;
203 d_ptr->attachToChart();
204 204 }
205 205
206 206 /*!
@@ -292,9 +292,10 qreal QLegend::minHeight() const
292 292
293 293 ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
294 294
295 QLegendPrivate::QLegendPrivate(ChartPresenter* presenter,QLegend *q):
295 QLegendPrivate::QLegendPrivate(ChartPresenter* presenter, QChart *chart, QLegend *q):
296 296 q_ptr(q),
297 297 m_presenter(presenter),
298 m_chart(chart),
298 299 m_markers(new QGraphicsItemGroup(q)),
299 300 m_alignment(QLegend::AlignmentTop),
300 301 m_offsetX(0),
@@ -407,6 +408,12 void QLegendPrivate::updateLayout()
407 408 }
408 409 }
409 410
411 void QLegendPrivate::attachToChart()
412 {
413 m_attachedToChart = true;
414 q_ptr->setParent(m_chart);
415 }
416
410 417 void QLegendPrivate::handleSeriesAdded(QAbstractSeries *series, Domain *domain)
411 418 {
412 419 Q_UNUSED(domain)
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@@ -34,6 +34,7
34 34
35 35 QTCOMMERCIALCHART_BEGIN_NAMESPACE
36 36
37 class QChart;
37 38 class ChartPresenter;
38 39 class QAbstractSeries;
39 40
@@ -41,11 +42,12 class QLegendPrivate : public QObject
41 42 {
42 43 Q_OBJECT
43 44 public:
44 QLegendPrivate(ChartPresenter *chart,QLegend *q);
45 QLegendPrivate(ChartPresenter *presenter, QChart *chart, QLegend *q);
45 46 ~QLegendPrivate();
46 47
47 48 void setOffset(qreal x, qreal y);
48 49 void updateLayout();
50 void attachToChart();
49 51
50 52 public Q_SLOTS:
51 53 void handleSeriesAdded(QAbstractSeries *series, Domain *domain);
@@ -56,6 +58,7 public Q_SLOTS:
56 58 private:
57 59 QLegend *q_ptr;
58 60 ChartPresenter *m_presenter;
61 QChart* m_chart;
59 62 QGraphicsItemGroup* m_markers;
60 63 QLegend::Alignments m_alignment;
61 64 QBrush m_brush;
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