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Uses Qt tooltips instead of QCPTextItem...
Uses Qt tooltips instead of QCPTextItem Tooltip is easier to manage and more flexible

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VisualizationGraphRenderingDelegate.cpp
102 lines | 3.5 KiB | text/x-c | CppLexer
/ gui / src / Visualization / VisualizationGraphRenderingDelegate.cpp
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Creates a delegate offering methods for rendering a graph
r480 #include "Visualization/VisualizationGraphRenderingDelegate.h"
#include "Visualization/qcustomplot.h"
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Uses the same time spec (UTC) as axis for tooltips on graph
r490 #include <Common/DateUtils.h>
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Inits tracers and timer...
r482 namespace {
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Show tracers method (1)...
r483 const auto DATETIME_FORMAT = QStringLiteral("yyyy/MM/dd hh:mm:ss:zzz");
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r576 const auto TOOLTIP_FORMAT = QStringLiteral("key: %1\nvalue: %2");
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r483
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r576 /// Tooltip display rectangle (the tooltip is hidden when the mouse leaves this rectangle)
const auto TOOLTIP_RECT = QRect{10, 10, 10, 10};
/// Timeout after which the tooltip is displayed
const auto TOOLTIP_TIMEOUT = 500;
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r482
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r483 /// Formats a data value according to the axis on which it is present
QString formatValue(double value, const QCPAxis &axis)
{
// If the axis is a time axis, formats the value as a date
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r490 if (auto axisTicker = qSharedPointerDynamicCast<QCPAxisTickerDateTime>(axis.ticker())) {
return DateUtils::dateTime(value, axisTicker->dateTimeSpec()).toString(DATETIME_FORMAT);
}
else {
return QString::number(value);
}
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r483 }
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Sets tracers' styles
r485
void initPointTracerStyle(QCPItemTracer &tracer) noexcept
{
tracer.setInterpolating(false);
tracer.setStyle(QCPItemTracer::tsPlus);
tracer.setPen(QPen(Qt::black));
tracer.setBrush(Qt::black);
tracer.setSize(10);
}
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r482 } // namespace
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Creates a delegate offering methods for rendering a graph
r480 struct VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegatePrivate {
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r482 explicit VisualizationGraphRenderingDelegatePrivate(QCustomPlot &plot)
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r576 : m_Plot{plot}, m_PointTracer{new QCPItemTracer{&plot}}, m_TracerTimer{}
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Inits tracers and timer...
r482 {
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r485 initPointTracerStyle(*m_PointTracer);
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r482
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r576 m_TracerTimer.setInterval(TOOLTIP_TIMEOUT);
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Inits tracers and timer...
r482 m_TracerTimer.setSingleShot(true);
}
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Creates a delegate offering methods for rendering a graph
r480
QCustomPlot &m_Plot;
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Inits tracers and timer...
r482 QCPItemTracer *m_PointTracer;
QTimer m_TracerTimer;
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Creates a delegate offering methods for rendering a graph
r480 };
VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegate(QCustomPlot &plot)
: impl{spimpl::make_unique_impl<VisualizationGraphRenderingDelegatePrivate>(plot)}
{
}
Alexandre Leroux
Creates method that will display a tooltip and a tracer with data point information after a while
r481
void VisualizationGraphRenderingDelegate::onMouseMove(QMouseEvent *event) noexcept
{
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r482 // Cancels pending refresh
impl->m_TracerTimer.disconnect();
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r576 // Reinits tracers
impl->m_PointTracer->setGraph(nullptr);
impl->m_PointTracer->setVisible(false);
impl->m_Plot.replot();
// Gets the graph under the mouse position
auto eventPos = event->pos();
if (auto graph = qobject_cast<QCPGraph *>(impl->m_Plot.plottableAt(eventPos))) {
auto mouseKey = graph->keyAxis()->pixelToCoord(eventPos.x());
auto graphData = graph->data();
// Gets the closest data point to the mouse
auto graphDataIt = graphData->findBegin(mouseKey);
if (graphDataIt != graphData->constEnd()) {
auto key = formatValue(graphDataIt->key, *graph->keyAxis());
auto value = formatValue(graphDataIt->value, *graph->valueAxis());
// Displays point tracer
impl->m_PointTracer->setGraph(graph);
impl->m_PointTracer->setGraphKey(graphDataIt->key);
impl->m_PointTracer->setLayer(
impl->m_Plot.layer("main")); // Tracer is set on top of the plot's main layer
impl->m_PointTracer->setVisible(true);
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r484 impl->m_Plot.replot();
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r482
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r576 // Starts timer to show tooltip after timeout
auto showTooltip = [ tooltip = TOOLTIP_FORMAT.arg(key, value), eventPos, this ]()
{
QToolTip::showText(impl->m_Plot.mapToGlobal(eventPos), tooltip, &impl->m_Plot,
TOOLTIP_RECT);
};
QObject::connect(&impl->m_TracerTimer, &QTimer::timeout, showTooltip);
impl->m_TracerTimer.start();
}
}
Alexandre Leroux
Creates method that will display a tooltip and a tracer with data point information after a while
r481 }