callout.cpp
128 lines
| 4.7 KiB
| text/x-c
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CppLexer
winter
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r0 | /**************************************************************************** | ||
** | ||||
** 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> | ||||
Callout::Callout(QGraphicsItem * parent): | ||||
QGraphicsItem(parent) | ||||
{ | ||||
} | ||||
QRectF Callout::boundingRect() const | ||||
{ | ||||
QPointF anchor = mapFromParent(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_anchor); | ||||
if (!m_rect.contains(anchor)) { | ||||
QPointF point1, point2; | ||||
// establish the position of the anchor point in relation to m_rect | ||||
bool 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(mapFromParent(m_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; | ||||
} | ||||