##// END OF EJS Templates
Shifts tooltip to mouse
Shifts tooltip to mouse

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VisualizationGraphRenderingDelegate.cpp
105 lines | 3.6 KiB | text/x-c | CppLexer
/ gui / src / Visualization / VisualizationGraphRenderingDelegate.cpp
#include "Visualization/VisualizationGraphRenderingDelegate.h"
#include "Visualization/qcustomplot.h"
#include <Common/DateUtils.h>
namespace {
const auto DATETIME_FORMAT = QStringLiteral("yyyy/MM/dd hh:mm:ss:zzz");
const auto TOOLTIP_FORMAT = QStringLiteral("key: %1\nvalue: %2");
/// Offset used to shift the tooltip of the mouse
const auto TOOLTIP_OFFSET = QPoint{20, 20};
/// 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;
/// 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
if (auto axisTicker = qSharedPointerDynamicCast<QCPAxisTickerDateTime>(axis.ticker())) {
return DateUtils::dateTime(value, axisTicker->dateTimeSpec()).toString(DATETIME_FORMAT);
}
else {
return QString::number(value);
}
}
void initPointTracerStyle(QCPItemTracer &tracer) noexcept
{
tracer.setInterpolating(false);
tracer.setStyle(QCPItemTracer::tsCircle);
tracer.setSize(3);
tracer.setPen(QPen(Qt::black));
tracer.setBrush(Qt::black);
}
} // namespace
struct VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegatePrivate {
explicit VisualizationGraphRenderingDelegatePrivate(QCustomPlot &plot)
: m_Plot{plot}, m_PointTracer{new QCPItemTracer{&plot}}, m_TracerTimer{}
{
initPointTracerStyle(*m_PointTracer);
m_TracerTimer.setInterval(TOOLTIP_TIMEOUT);
m_TracerTimer.setSingleShot(true);
}
QCustomPlot &m_Plot;
QCPItemTracer *m_PointTracer;
QTimer m_TracerTimer;
};
VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegate(QCustomPlot &plot)
: impl{spimpl::make_unique_impl<VisualizationGraphRenderingDelegatePrivate>(plot)}
{
}
void VisualizationGraphRenderingDelegate::onMouseMove(QMouseEvent *event) noexcept
{
// Cancels pending refresh
impl->m_TracerTimer.disconnect();
// 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);
impl->m_Plot.replot();
// 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_OFFSET, tooltip,
&impl->m_Plot, TOOLTIP_RECT);
};
QObject::connect(&impl->m_TracerTimer, &QTimer::timeout, showTooltip);
impl->m_TracerTimer.start();
}
}
}