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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "callout.h"
#include "calloutview.h"
#include <QChart>
#include <QGraphicsLayout>
#include <QGraphicsScene>
#include <QGraphicsTextItem>
#include <QGraphicsView>
#include <QLineSeries>
#include <QMouseEvent>
#include <QSplineSeries>
#include <QResizeEvent>
CalloutView::CalloutView(QWidget *parent)
: QGraphicsView(new QGraphicsScene, parent)
{
setDragMode(QGraphicsView::NoDrag);
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setFrameShape(QFrame::NoFrame);
setBackgroundRole(QPalette::Window);
setRenderHint(QPainter::Antialiasing);
setMouseTracking(true);
m_chart = new QChart;
m_chart->setTitle("Hover the line to show callout. Click the line to make it stay.");
m_chart->legend()->hide();
auto series = new QLineSeries;
series->append(1, 3);
series->append(4, 5);
series->append(5, 4.5);
series->append(7, 1);
series->append(11, 2);
m_chart->addSeries(series);
auto series2 = new QSplineSeries;
series2->append(1.6, 1.4);
series2->append(2.4, 3.5);
series2->append(3.7, 2.5);
series2->append(7, 4);
series2->append(10, 2);
m_chart->addSeries(series2);
m_chart->createDefaultAxes();
m_chart->setAcceptHoverEvents(true);
scene()->addItem(m_chart);
m_coordX = new QGraphicsSimpleTextItem(m_chart);
m_coordX->setText("X: ");
m_coordY = new QGraphicsSimpleTextItem(m_chart);
m_coordY->setText("Y: ");
connect(series, &QLineSeries::clicked, this, &CalloutView::keepCallout);
connect(series, &QLineSeries::hovered, this, &CalloutView::tooltip);
connect(series2, &QSplineSeries::clicked, this, &CalloutView::keepCallout);
connect(series2, &QSplineSeries::hovered, this, &CalloutView::tooltip);
}
CalloutView::~CalloutView()
{
delete scene();
}
void CalloutView::resizeEvent(QResizeEvent *event)
{
if (scene()) {
scene()->setSceneRect(QRect(QPoint(0, 0), event->size()));
m_chart->resize(event->size());
m_coordX->setPos(m_chart->size().width() / 2 - 70, m_chart->size().height() - 24);
m_coordY->setPos(m_chart->size().width() / 2 + 30, m_chart->size().height() - 24);
const auto callouts = m_callouts;
for (Callout *callout : callouts)
callout->updateGeometry();
}
resize(size());
}
void CalloutView::mouseMoveEvent(QMouseEvent *event)
{
m_coordX->setText(QString("X: %1").arg(m_chart->mapToValue(event->pos()).x()));
m_coordY->setText(QString("Y: %1").arg(m_chart->mapToValue(event->pos()).y()));
QGraphicsView::mouseMoveEvent(event);
}
void CalloutView::keepCallout()
{
m_callouts.append(m_tooltip);
m_tooltip = new Callout(m_chart);
}
void CalloutView::tooltip(QPointF point, bool state)
{
if (!m_tooltip)
m_tooltip = new Callout(m_chart);
if (state) {
m_tooltip->setText(QString("X: %1 \nY: %2 ").arg(point.x()).arg(point.y()));
m_tooltip->setAnchor(point);
m_tooltip->setZValue(11);
m_tooltip->updateGeometry();
m_tooltip->show();
} else {
m_tooltip->hide();
}
}
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