Qt 官方例子 Callout Example

QtoolTip自定义实现。
Callout.cpp

/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Charts module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/#include "callout.h"
#include <QtGui/QPainter>
#include <QtGui/QFontMetrics>
#include <QtWidgets/QGraphicsSceneMouseEvent>
#include <QtGui/QMouseEvent>
#include <QtCharts/QChart>Callout::Callout(QChart *chart):QGraphicsItem(chart),m_chart(chart)
{
}QRectF Callout::boundingRect() const
{QPointF anchor = mapFromParent(m_chart->mapToPosition(m_anchor));QRectF rect;rect.setLeft(qMin(m_rect.left(), anchor.x()));rect.setRight(qMax(m_rect.right(), anchor.x()));rect.setTop(qMin(m_rect.top(), anchor.y()));rect.setBottom(qMax(m_rect.bottom(), anchor.y()));return rect;
}void Callout::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{Q_UNUSED(option)Q_UNUSED(widget)QPainterPath path;path.addRoundedRect(m_rect, 5, 5);QPointF anchor = mapFromParent(m_chart->mapToPosition(m_anchor));if (!m_rect.contains(anchor)) {QPointF point1, point2;// establish the position of the anchor point in relation to m_rectbool above = anchor.y() <= m_rect.top();bool aboveCenter = anchor.y() > m_rect.top() && anchor.y() <= m_rect.center().y();bool belowCenter = anchor.y() > m_rect.center().y() && anchor.y() <= m_rect.bottom();bool below = anchor.y() > m_rect.bottom();bool onLeft = anchor.x() <= m_rect.left();bool leftOfCenter = anchor.x() > m_rect.left() && anchor.x() <= m_rect.center().x();bool rightOfCenter = anchor.x() > m_rect.center().x() && anchor.x() <= m_rect.right();bool onRight = anchor.x() > m_rect.right();// get the nearest m_rect corner.qreal x = (onRight + rightOfCenter) * m_rect.width();qreal y = (below + belowCenter) * m_rect.height();bool cornerCase = (above && onLeft) || (above && onRight) || (below && onLeft) || (below && onRight);bool vertical = qAbs(anchor.x() - x) > qAbs(anchor.y() - y);qreal x1 = x + leftOfCenter * 10 - rightOfCenter * 20 + cornerCase * !vertical * (onLeft * 10 - onRight * 20);qreal y1 = y + aboveCenter * 10 - belowCenter * 20 + cornerCase * vertical * (above * 10 - below * 20);;point1.setX(x1);point1.setY(y1);qreal x2 = x + leftOfCenter * 20 - rightOfCenter * 10 + cornerCase * !vertical * (onLeft * 20 - onRight * 10);;qreal y2 = y + aboveCenter * 20 - belowCenter * 10 + cornerCase * vertical * (above * 20 - below * 10);;point2.setX(x2);point2.setY(y2);path.moveTo(point1);path.lineTo(anchor);path.lineTo(point2);path = path.simplified();}painter->setBrush(QColor(255, 255, 255));painter->drawPath(path);painter->drawText(m_textRect, m_text);
}void Callout::mousePressEvent(QGraphicsSceneMouseEvent *event)
{event->setAccepted(true);
}void Callout::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{if (event->buttons() & Qt::LeftButton){setPos(mapToParent(event->pos() - event->buttonDownPos(Qt::LeftButton)));event->setAccepted(true);} else {event->setAccepted(false);}
}void Callout::setText(const QString &text)
{m_text = text;QFontMetrics metrics(m_font);m_textRect = metrics.boundingRect(QRect(0, 0, 150, 150), Qt::AlignLeft, m_text);m_textRect.translate(5, 5);prepareGeometryChange();m_rect = m_textRect.adjusted(-5, -5, 5, 5);
}void Callout::setAnchor(QPointF point)
{m_anchor = point;
}void Callout::updateGeometry()
{prepareGeometryChange();setPos(m_chart->mapToPosition(m_anchor) + QPoint(10, -50));
}

Callout.h

/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Charts module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/#ifndef CALLOUT_H
#define CALLOUT_H#include <QtCharts/QChartGlobal>
#include <QtWidgets/QGraphicsItem>
#include <QtGui/QFont>QT_BEGIN_NAMESPACE
class QGraphicsSceneMouseEvent;
QT_END_NAMESPACEQT_CHARTS_BEGIN_NAMESPACE
class QChart;
QT_CHARTS_END_NAMESPACEQT_CHARTS_USE_NAMESPACEclass Callout : public QGraphicsItem
{
public:Callout(QChart *parent);void setText(const QString &text);void setAnchor(QPointF point);void updateGeometry();QRectF boundingRect() const;void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,QWidget *widget);protected:void mousePressEvent(QGraphicsSceneMouseEvent *event);void mouseMoveEvent(QGraphicsSceneMouseEvent *event);private:QString m_text;QRectF m_textRect;QRectF m_rect;QPointF m_anchor;QFont m_font;QChart *m_chart;
};#endif // CALLOUT_H

如何使用该类：

QChart *m_chart=new QChart;

Callout m_tooltip = new Callout(m_chart);

m_tooltip->setText(QString("时间: %1 \n人数: %2 ").arg(strBuffer).arg(qRound(point.y())));//显示文本
m_tooltip->setAnchor(point);
m_tooltip->setZValue(11);
m_tooltip->updateGeometry();
m_tooltip->show();//显示
m_tooltip->hide();//隐藏
---------------------
作者：fsfsfsdfsdfdr
来源：CSDN
原文：https://blog.csdn.net/fsfsfsdfsdfdr/article/details/89757553
版权声明：本文为博主原创文章，转载请附上博文链接！

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Qt 官方例子 Callout Example

Callout m_tooltip = new Callout(m_chart);

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